├── .gitignore
├── LICENSE
├── base
├── build.gradle
└── src
│ └── main
│ ├── AndroidManifest.xml
│ ├── java
│ └── com
│ │ └── cyrilmottier
│ │ └── android
│ │ └── puzzlers
│ │ └── base
│ │ └── Tracing.kt
│ └── res
│ └── values
│ └── themes.xml
├── build.gradle
├── channels
├── EXPLANATION.md
├── build.gradle
└── src
│ └── main
│ ├── AndroidManifest.xml
│ └── java
│ └── com
│ └── cyrilmottier
│ └── android
│ └── puzzlers
│ └── MainActivity.kt
├── detach
├── EXPLANATION.md
├── build.gradle
└── src
│ └── main
│ ├── AndroidManifest.xml
│ └── java
│ └── com
│ └── cyrilmottier
│ └── android
│ └── puzzlers
│ ├── MainActivity.kt
│ └── TracingFragment.kt
├── drawable
├── EXPLANATION.md
├── build.gradle
└── src
│ └── main
│ ├── AndroidManifest.xml
│ ├── java
│ └── com
│ │ └── cyrilmottier
│ │ └── android
│ │ └── puzzlers
│ │ └── MainActivity.kt
│ └── res
│ └── drawable
│ ├── layer_list.xml
│ ├── level_list.xml
│ └── shape.xml
├── ext.gradle
├── gradle.properties
├── gradle
├── common.gradle
├── puzzler.gradle
└── wrapper
│ ├── gradle-wrapper.jar
│ └── gradle-wrapper.properties
├── gradlew
├── gradlew.bat
├── inflate
├── EXPLANATION.md
├── build.gradle
└── src
│ └── main
│ ├── AndroidManifest.xml
│ ├── java
│ └── com
│ │ └── cyrilmottier
│ │ └── android
│ │ └── puzzlers
│ │ └── MainActivity.kt
│ └── res
│ └── layout
│ └── view_inflate.xml
├── lifecycle
├── EXPLANATION.md
├── build.gradle
└── src
│ └── main
│ ├── AndroidManifest.xml
│ └── java
│ └── com
│ └── cyrilmottier
│ └── android
│ └── puzzlers
│ └── MainActivity.kt
├── locale
├── EXPLANATION.md
├── build.gradle
└── src
│ └── main
│ ├── AndroidManifest.xml
│ ├── java
│ └── com
│ │ └── cyrilmottier
│ │ └── android
│ │ └── puzzlers
│ │ └── MainActivity.kt
│ └── res
│ ├── layout
│ └── activity_main.xml
│ ├── values-es
│ └── strings.xml
│ └── values
│ └── strings.xml
├── padding
├── EXPLANATION.md
├── build.gradle
└── src
│ └── main
│ ├── AndroidManifest.xml
│ ├── java
│ └── com
│ │ └── cyrilmottier
│ │ └── android
│ │ └── puzzlers
│ │ └── MainActivity.kt
│ └── res
│ ├── drawable
│ └── padded_rect.xml
│ └── layout
│ └── activity_main.xml
├── prefererences
├── EXPLANATION.md
├── build.gradle
└── src
│ └── main
│ ├── AndroidManifest.xml
│ └── java
│ └── com
│ └── cyrilmottier
│ └── android
│ └── puzzlers
│ └── MainActivity.kt
├── settings.gradle
└── weight
├── EXPLANATION.md
├── build.gradle
└── src
└── main
├── AndroidManifest.xml
├── java
└── com
│ └── cyrilmottier
│ └── android
│ └── puzzlers
│ └── MainActivity.kt
└── res
└── layout
└── activity_main.xml
/.gitignore:
--------------------------------------------------------------------------------
1 | *.iml
2 | .DS_Store
3 | .externalNativeBuild
4 | .gradle
5 | build/
6 | /local.properties
7 | /.idea
8 | /captures
9 |
--------------------------------------------------------------------------------
/LICENSE:
--------------------------------------------------------------------------------
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--------------------------------------------------------------------------------
/base/build.gradle:
--------------------------------------------------------------------------------
1 | apply plugin: 'com.android.library'
2 | apply from: common
3 |
--------------------------------------------------------------------------------
/base/src/main/AndroidManifest.xml:
--------------------------------------------------------------------------------
1 |
2 |
--------------------------------------------------------------------------------
/base/src/main/java/com/cyrilmottier/android/puzzlers/base/Tracing.kt:
--------------------------------------------------------------------------------
1 | package com.cyrilmottier.android.puzzlers.base
2 |
3 | import android.util.Log
4 |
5 | private const val TAG = "Puzzlers"
6 |
7 | fun trace(message: Any?) {
8 | Log.d(TAG, message?.toString())
9 | }
10 |
--------------------------------------------------------------------------------
/base/src/main/res/values/themes.xml:
--------------------------------------------------------------------------------
1 |
2 |
3 |
4 |
5 |
6 |
--------------------------------------------------------------------------------
/build.gradle:
--------------------------------------------------------------------------------
1 | buildscript {
2 | ext.kotlin_version = '1.3.21'
3 | repositories {
4 | google()
5 | jcenter()
6 |
7 | }
8 | dependencies {
9 | classpath 'com.android.tools.build:gradle:3.4.0'
10 | classpath "org.jetbrains.kotlin:kotlin-gradle-plugin:$kotlin_version"
11 | }
12 | }
13 |
14 | apply from: "ext.gradle"
15 |
16 | allprojects {
17 | repositories {
18 | google()
19 | jcenter()
20 |
21 | }
22 | }
23 |
24 | task clean(type: Delete) {
25 | delete rootProject.buildDir
26 | }
27 |
--------------------------------------------------------------------------------
/channels/EXPLANATION.md:
--------------------------------------------------------------------------------
1 | # Notification channels
2 |
3 | ## Answer
4 |
5 | D: Another name, 3, 0xffff0000
6 |
7 | ## More info
8 |
9 | There are two non-natural behaviors in this app:
10 |
11 | 1. `NotificationManager`'s `deleteNotificationChannel(String)` doesn't really delete channels. It rather "hide" them. Indeed, if you create a channel with the same ID, the deleted channel will-deleted with all of the same settings it had before it was deleted.
12 | 2. Modification of a channel is only for some specific parts and only in certain circumstances:
13 | - Name & description can always be modified
14 | - Importance can only be modified if 1) the new importance is lower than the current value and 2) the use has not altered any setting on this channel
15 | - Group can only be modified if the channel has no group yet
16 | - Other fields are never ever modified
17 |
18 | ## Misc
19 |
20 | Although counter-intuitive, this behavior is here to prevent abuse with notifications channels. In general, choose you channels wisely and always try to limit the number of modification to a minimum. If you do so, consider new IDs and make sure to never ever reuse the old ones.
21 |
22 |
--------------------------------------------------------------------------------
/channels/build.gradle:
--------------------------------------------------------------------------------
1 | apply from: puzzler
2 |
--------------------------------------------------------------------------------
/channels/src/main/AndroidManifest.xml:
--------------------------------------------------------------------------------
1 |
2 |
6 |
7 |
12 |
13 |
14 |
15 |
16 |
17 |
18 |
19 |
20 |
21 |
22 |
23 |
--------------------------------------------------------------------------------
/channels/src/main/java/com/cyrilmottier/android/puzzlers/MainActivity.kt:
--------------------------------------------------------------------------------
1 | package com.cyrilmottier.android.puzzlers
2 |
3 | import android.app.Activity
4 | import android.app.NotificationChannel
5 | import android.app.NotificationManager
6 | import android.graphics.Color
7 | import android.os.Bundle
8 | import com.cyrilmottier.android.puzzlers.base.trace
9 |
10 | private const val CHANNEL_ID = "channel"
11 |
12 | class MainActivity : Activity() {
13 |
14 | override fun onCreate(savedInstanceState: Bundle?) {
15 | super.onCreate(savedInstanceState)
16 | val manager = getSystemService(NotificationManager::class.java)
17 |
18 | val aChannel = NotificationChannel(
19 | CHANNEL_ID, // id
20 | "A name", // name
21 | NotificationManager.IMPORTANCE_DEFAULT // importance (3)
22 | )
23 | aChannel.lightColor = Color.RED
24 |
25 | manager.createNotificationChannel(aChannel)
26 | manager.deleteNotificationChannel(CHANNEL_ID)
27 |
28 | val anotherChannel = NotificationChannel(
29 | CHANNEL_ID, // id
30 | "Another name", // name
31 | NotificationManager.IMPORTANCE_HIGH // importance (4)
32 | )
33 | anotherChannel.lightColor = Color.GREEN
34 |
35 | manager.createNotificationChannel(anotherChannel)
36 |
37 | with(manager.getNotificationChannel(CHANNEL_ID)) {
38 | trace("$name, $importance, 0x${Integer.toHexString(lightColor)}")
39 | }
40 | }
41 | }
42 |
43 | // What will it trace?
44 |
45 | // A: A name, 3, 0xffff0000
46 | // B: Another name, 4, 0xff00ff00
47 | // C: Another name, 3, 0xff00ff00
48 | // D: Another name, 3, 0xffff0000
49 |
--------------------------------------------------------------------------------
/detach/EXPLANATION.md:
--------------------------------------------------------------------------------
1 | # Fragment lifecyle
2 |
3 | ## Answer
4 |
5 | B: onAttach, onCreate, onCreateView, onDestroyView
6 |
7 | ## More info
8 |
9 | Contrary to what we could expect, `FragmentTransaction#detach` is not tight to the `onAttach`/`onDetach` callback but to the creation/destruction of the `Fragment`’s `View`. As a consequence, calling `detach` results in having the `Fragment`’s `View` destroyed and hence `onDestroyView()` called. We’re really facing a naming issue here.
10 |
--------------------------------------------------------------------------------
/detach/build.gradle:
--------------------------------------------------------------------------------
1 | apply from: puzzler
2 |
3 | dependencies {
4 | implementation 'androidx.fragment:fragment:1.0.0'
5 | }
6 |
7 |
--------------------------------------------------------------------------------
/detach/src/main/AndroidManifest.xml:
--------------------------------------------------------------------------------
1 |
2 |
6 |
7 |
12 |
13 |
14 |
15 |
16 |
17 |
18 |
19 |
20 |
21 |
22 |
23 |
--------------------------------------------------------------------------------
/detach/src/main/java/com/cyrilmottier/android/puzzlers/MainActivity.kt:
--------------------------------------------------------------------------------
1 | package com.cyrilmottier.android.puzzlers
2 |
3 | import android.os.Bundle
4 | import androidx.fragment.app.FragmentActivity
5 |
6 | class MainActivity : FragmentActivity() {
7 |
8 | override fun onCreate(savedInstanceState: Bundle?) {
9 | super.onCreate(savedInstanceState)
10 |
11 | val fragment = TracingFragment()
12 |
13 | supportFragmentManager.beginTransaction()
14 | .add(android.R.id.content, fragment, "fragment:puzzler")
15 | .commit()
16 |
17 | supportFragmentManager.beginTransaction()
18 | .detach(fragment)
19 | .commit()
20 | }
21 |
22 |
23 | override fun onSaveInstanceState(outState: Bundle?) {
24 | // For the simplicity of this puzzler,
25 | // let’s consider state is never ever saved
26 | }
27 |
28 | }
29 |
30 | // What will it trace?
31 |
32 | // A: onAttach, onCreate, onCreateView, onDestroyView, onDestroy, onDetach
33 | // B: onAttach, onCreate, onCreateView, onDestroyView
34 | // C: onCreate, onDestroy
35 | // D: Nothing
36 |
--------------------------------------------------------------------------------
/detach/src/main/java/com/cyrilmottier/android/puzzlers/TracingFragment.kt:
--------------------------------------------------------------------------------
1 | package com.cyrilmottier.android.puzzlers
2 |
3 | import android.content.Context
4 | import android.os.Bundle
5 | import android.view.LayoutInflater
6 | import android.view.View
7 | import android.view.ViewGroup
8 | import androidx.fragment.app.Fragment
9 | import com.cyrilmottier.android.puzzlers.base.trace
10 |
11 | class TracingFragment : Fragment() {
12 | override fun onAttach(context: Context?) {
13 | super.onAttach(context)
14 | trace("onAttach")
15 | }
16 |
17 | override fun onCreate(savedInstanceState: Bundle?) {
18 | super.onCreate(savedInstanceState)
19 | trace("onCreate")
20 | }
21 |
22 | override fun onCreateView(
23 | inflater: LayoutInflater,
24 | container: ViewGroup?,
25 | savedInstanceState: Bundle?
26 | ): View? {
27 | trace("onCreateView")
28 | return super.onCreateView(inflater, container, savedInstanceState)
29 | }
30 |
31 | override fun onDestroyView() {
32 | trace("onDestroyView")
33 | super.onDestroyView()
34 | }
35 |
36 | override fun onDestroy() {
37 | trace("onDestroy")
38 | super.onDestroy()
39 | }
40 |
41 | override fun onDetach() {
42 | trace("onDetach")
43 | super.onDetach()
44 | }
45 | }
46 |
--------------------------------------------------------------------------------
/drawable/EXPLANATION.md:
--------------------------------------------------------------------------------
1 | # Drawable tags
2 |
3 | ## Answer
4 |
5 | C: LevelListDrawable, LayerDrawable, GradientDrawable
6 |
7 | ## More info
8 |
9 | In general, the tags used in XML (in lisp-case) are associated to their upper-camel-case Java class equivalent. For instance, `` inflates a `BitmapDrawable`, `` an `AnimatedVectorDrawable`, etc.
10 |
11 | There are several several edge-cases:
12 |
13 | - `` inflates a `StateListDrawable`
14 | - `` inflates a `AnimatedStateListDrawable`
15 | - `` inflates a `AnimationDrawable`
16 | - `` inflates a `LayerDrawable`
17 | - `` inflates a `GradientDrawable` (although `ShapeDrawable` does exist in the Android SDK)
18 |
19 |
20 | # Misc
21 |
22 | There is even an XML-only `Drawable` you can inflate with ``. The API is private but it is exposed via XML… The only evidence in the documentation are `R.styleable.AnimatedRotateDrawable` values.
23 |
24 | Starting API 24, you can also inflate your own Drawables in XML. Simply implement the `inflate` method.
25 |
--------------------------------------------------------------------------------
/drawable/build.gradle:
--------------------------------------------------------------------------------
1 | apply from: puzzler
2 |
--------------------------------------------------------------------------------
/drawable/src/main/AndroidManifest.xml:
--------------------------------------------------------------------------------
1 |
2 |
6 |
7 |
12 |
13 |
14 |
15 |
16 |
17 |
18 |
19 |
20 |
21 |
22 |
23 |
--------------------------------------------------------------------------------
/drawable/src/main/java/com/cyrilmottier/android/puzzlers/MainActivity.kt:
--------------------------------------------------------------------------------
1 | package com.cyrilmottier.android.puzzlers
2 |
3 | import android.app.Activity
4 | import android.os.Bundle
5 | import com.cyrilmottier.android.puzzlers.base.trace
6 |
7 | class MainActivity : Activity() {
8 | override fun onCreate(savedInstanceState: Bundle?) {
9 | super.onCreate(savedInstanceState)
10 |
11 | val classNames = arrayOf(
12 | R.drawable.level_list,
13 | R.drawable.layer_list,
14 | R.drawable.shape
15 | ).map {
16 | getDrawable(it)::class.java.simpleName
17 | }
18 |
19 | trace(classNames.joinToString(", "))
20 | }
21 | }
22 |
23 | // What will it trace?
24 |
25 | // A: LevelListDrawable, LayerListDrawable, ShapeDrawable
26 | // B: LevelDrawable, LayerListDrawable, ShapeDrawable
27 | // C: LevelListDrawable, LayerDrawable, GradientDrawable
28 | // D: throws InflateException
29 |
--------------------------------------------------------------------------------
/drawable/src/main/res/drawable/layer_list.xml:
--------------------------------------------------------------------------------
1 |
2 |
3 |
--------------------------------------------------------------------------------
/drawable/src/main/res/drawable/level_list.xml:
--------------------------------------------------------------------------------
1 |
2 |
3 |
--------------------------------------------------------------------------------
/drawable/src/main/res/drawable/shape.xml:
--------------------------------------------------------------------------------
1 |
2 |
3 |
--------------------------------------------------------------------------------
/ext.gradle:
--------------------------------------------------------------------------------
1 | buildscript {
2 | ext.common = "${rootDir}/gradle/common.gradle"
3 | ext.puzzler = "${rootDir}/gradle/puzzler.gradle"
4 | }
5 |
--------------------------------------------------------------------------------
/gradle.properties:
--------------------------------------------------------------------------------
1 | # Project-wide Gradle settings.
2 | # IDE (e.g. Android Studio) users:
3 | # Gradle settings configured through the IDE *will override*
4 | # any settings specified in this file.
5 | # For more details on how to configure your build environment visit
6 | # http://www.gradle.org/docs/current/userguide/build_environment.html
7 | # Specifies the JVM arguments used for the daemon process.
8 | # The setting is particularly useful for tweaking memory settings.
9 | org.gradle.jvmargs=-Xmx1536m
10 | # When configured, Gradle will run in incubating parallel mode.
11 | # This option should only be used with decoupled projects. More details, visit
12 | # http://www.gradle.org/docs/current/userguide/multi_project_builds.html#sec:decoupled_projects
13 | # org.gradle.parallel=true
14 | # Kotlin code style for this project: "official" or "obsolete":
15 | kotlin.code.style=official
16 |
--------------------------------------------------------------------------------
/gradle/common.gradle:
--------------------------------------------------------------------------------
1 | apply plugin: 'kotlin-android'
2 | apply plugin: 'kotlin-android-extensions'
3 |
4 | android {
5 | compileSdkVersion 28
6 |
7 | defaultConfig {
8 | minSdkVersion 28
9 | targetSdkVersion 28
10 | versionCode 1
11 | versionName "1.0"
12 | }
13 |
14 | buildTypes {
15 | release {
16 | minifyEnabled false
17 | proguardFiles getDefaultProguardFile('proguard-android-optimize.txt')
18 | }
19 | }
20 | }
21 |
22 | dependencies {
23 | implementation "org.jetbrains.kotlin:kotlin-stdlib-jdk7:$kotlin_version"
24 | }
25 |
--------------------------------------------------------------------------------
/gradle/puzzler.gradle:
--------------------------------------------------------------------------------
1 | apply plugin: 'com.android.application'
2 | apply from: common
3 |
4 | android {
5 | defaultConfig {
6 | applicationId "com.cyrilmottier.android.puzzlers"
7 | }
8 | }
9 |
10 | dependencies {
11 | implementation project(":base")
12 | }
13 |
--------------------------------------------------------------------------------
/gradle/wrapper/gradle-wrapper.jar:
--------------------------------------------------------------------------------
https://raw.githubusercontent.com/cyrilmottier/AndroidPuzzlers/0022c366665fccd44afa2f6bcda1e71a68f6986b/gradle/wrapper/gradle-wrapper.jar
--------------------------------------------------------------------------------
/gradle/wrapper/gradle-wrapper.properties:
--------------------------------------------------------------------------------
1 | #Thu Apr 18 21:50:33 CEST 2019
2 | distributionBase=GRADLE_USER_HOME
3 | distributionPath=wrapper/dists
4 | zipStoreBase=GRADLE_USER_HOME
5 | zipStorePath=wrapper/dists
6 | distributionUrl=https\://services.gradle.org/distributions/gradle-5.4-all.zip
7 |
--------------------------------------------------------------------------------
/gradlew:
--------------------------------------------------------------------------------
1 | #!/usr/bin/env sh
2 |
3 | ##############################################################################
4 | ##
5 | ## Gradle start up script for UN*X
6 | ##
7 | ##############################################################################
8 |
9 | # Attempt to set APP_HOME
10 | # Resolve links: $0 may be a link
11 | PRG="$0"
12 | # Need this for relative symlinks.
13 | while [ -h "$PRG" ] ; do
14 | ls=`ls -ld "$PRG"`
15 | link=`expr "$ls" : '.*-> \(.*\)$'`
16 | if expr "$link" : '/.*' > /dev/null; then
17 | PRG="$link"
18 | else
19 | PRG=`dirname "$PRG"`"/$link"
20 | fi
21 | done
22 | SAVED="`pwd`"
23 | cd "`dirname \"$PRG\"`/" >/dev/null
24 | APP_HOME="`pwd -P`"
25 | cd "$SAVED" >/dev/null
26 |
27 | APP_NAME="Gradle"
28 | APP_BASE_NAME=`basename "$0"`
29 |
30 | # Add default JVM options here. You can also use JAVA_OPTS and GRADLE_OPTS to pass JVM options to this script.
31 | DEFAULT_JVM_OPTS=""
32 |
33 | # Use the maximum available, or set MAX_FD != -1 to use that value.
34 | MAX_FD="maximum"
35 |
36 | warn () {
37 | echo "$*"
38 | }
39 |
40 | die () {
41 | echo
42 | echo "$*"
43 | echo
44 | exit 1
45 | }
46 |
47 | # OS specific support (must be 'true' or 'false').
48 | cygwin=false
49 | msys=false
50 | darwin=false
51 | nonstop=false
52 | case "`uname`" in
53 | CYGWIN* )
54 | cygwin=true
55 | ;;
56 | Darwin* )
57 | darwin=true
58 | ;;
59 | MINGW* )
60 | msys=true
61 | ;;
62 | NONSTOP* )
63 | nonstop=true
64 | ;;
65 | esac
66 |
67 | CLASSPATH=$APP_HOME/gradle/wrapper/gradle-wrapper.jar
68 |
69 | # Determine the Java command to use to start the JVM.
70 | if [ -n "$JAVA_HOME" ] ; then
71 | if [ -x "$JAVA_HOME/jre/sh/java" ] ; then
72 | # IBM's JDK on AIX uses strange locations for the executables
73 | JAVACMD="$JAVA_HOME/jre/sh/java"
74 | else
75 | JAVACMD="$JAVA_HOME/bin/java"
76 | fi
77 | if [ ! -x "$JAVACMD" ] ; then
78 | die "ERROR: JAVA_HOME is set to an invalid directory: $JAVA_HOME
79 |
80 | Please set the JAVA_HOME variable in your environment to match the
81 | location of your Java installation."
82 | fi
83 | else
84 | JAVACMD="java"
85 | which java >/dev/null 2>&1 || die "ERROR: JAVA_HOME is not set and no 'java' command could be found in your PATH.
86 |
87 | Please set the JAVA_HOME variable in your environment to match the
88 | location of your Java installation."
89 | fi
90 |
91 | # Increase the maximum file descriptors if we can.
92 | if [ "$cygwin" = "false" -a "$darwin" = "false" -a "$nonstop" = "false" ] ; then
93 | MAX_FD_LIMIT=`ulimit -H -n`
94 | if [ $? -eq 0 ] ; then
95 | if [ "$MAX_FD" = "maximum" -o "$MAX_FD" = "max" ] ; then
96 | MAX_FD="$MAX_FD_LIMIT"
97 | fi
98 | ulimit -n $MAX_FD
99 | if [ $? -ne 0 ] ; then
100 | warn "Could not set maximum file descriptor limit: $MAX_FD"
101 | fi
102 | else
103 | warn "Could not query maximum file descriptor limit: $MAX_FD_LIMIT"
104 | fi
105 | fi
106 |
107 | # For Darwin, add options to specify how the application appears in the dock
108 | if $darwin; then
109 | GRADLE_OPTS="$GRADLE_OPTS \"-Xdock:name=$APP_NAME\" \"-Xdock:icon=$APP_HOME/media/gradle.icns\""
110 | fi
111 |
112 | # For Cygwin, switch paths to Windows format before running java
113 | if $cygwin ; then
114 | APP_HOME=`cygpath --path --mixed "$APP_HOME"`
115 | CLASSPATH=`cygpath --path --mixed "$CLASSPATH"`
116 | JAVACMD=`cygpath --unix "$JAVACMD"`
117 |
118 | # We build the pattern for arguments to be converted via cygpath
119 | ROOTDIRSRAW=`find -L / -maxdepth 1 -mindepth 1 -type d 2>/dev/null`
120 | SEP=""
121 | for dir in $ROOTDIRSRAW ; do
122 | ROOTDIRS="$ROOTDIRS$SEP$dir"
123 | SEP="|"
124 | done
125 | OURCYGPATTERN="(^($ROOTDIRS))"
126 | # Add a user-defined pattern to the cygpath arguments
127 | if [ "$GRADLE_CYGPATTERN" != "" ] ; then
128 | OURCYGPATTERN="$OURCYGPATTERN|($GRADLE_CYGPATTERN)"
129 | fi
130 | # Now convert the arguments - kludge to limit ourselves to /bin/sh
131 | i=0
132 | for arg in "$@" ; do
133 | CHECK=`echo "$arg"|egrep -c "$OURCYGPATTERN" -`
134 | CHECK2=`echo "$arg"|egrep -c "^-"` ### Determine if an option
135 |
136 | if [ $CHECK -ne 0 ] && [ $CHECK2 -eq 0 ] ; then ### Added a condition
137 | eval `echo args$i`=`cygpath --path --ignore --mixed "$arg"`
138 | else
139 | eval `echo args$i`="\"$arg\""
140 | fi
141 | i=$((i+1))
142 | done
143 | case $i in
144 | (0) set -- ;;
145 | (1) set -- "$args0" ;;
146 | (2) set -- "$args0" "$args1" ;;
147 | (3) set -- "$args0" "$args1" "$args2" ;;
148 | (4) set -- "$args0" "$args1" "$args2" "$args3" ;;
149 | (5) set -- "$args0" "$args1" "$args2" "$args3" "$args4" ;;
150 | (6) set -- "$args0" "$args1" "$args2" "$args3" "$args4" "$args5" ;;
151 | (7) set -- "$args0" "$args1" "$args2" "$args3" "$args4" "$args5" "$args6" ;;
152 | (8) set -- "$args0" "$args1" "$args2" "$args3" "$args4" "$args5" "$args6" "$args7" ;;
153 | (9) set -- "$args0" "$args1" "$args2" "$args3" "$args4" "$args5" "$args6" "$args7" "$args8" ;;
154 | esac
155 | fi
156 |
157 | # Escape application args
158 | save () {
159 | for i do printf %s\\n "$i" | sed "s/'/'\\\\''/g;1s/^/'/;\$s/\$/' \\\\/" ; done
160 | echo " "
161 | }
162 | APP_ARGS=$(save "$@")
163 |
164 | # Collect all arguments for the java command, following the shell quoting and substitution rules
165 | eval set -- $DEFAULT_JVM_OPTS $JAVA_OPTS $GRADLE_OPTS "\"-Dorg.gradle.appname=$APP_BASE_NAME\"" -classpath "\"$CLASSPATH\"" org.gradle.wrapper.GradleWrapperMain "$APP_ARGS"
166 |
167 | # by default we should be in the correct project dir, but when run from Finder on Mac, the cwd is wrong
168 | if [ "$(uname)" = "Darwin" ] && [ "$HOME" = "$PWD" ]; then
169 | cd "$(dirname "$0")"
170 | fi
171 |
172 | exec "$JAVACMD" "$@"
173 |
--------------------------------------------------------------------------------
/gradlew.bat:
--------------------------------------------------------------------------------
1 | @if "%DEBUG%" == "" @echo off
2 | @rem ##########################################################################
3 | @rem
4 | @rem Gradle startup script for Windows
5 | @rem
6 | @rem ##########################################################################
7 |
8 | @rem Set local scope for the variables with windows NT shell
9 | if "%OS%"=="Windows_NT" setlocal
10 |
11 | set DIRNAME=%~dp0
12 | if "%DIRNAME%" == "" set DIRNAME=.
13 | set APP_BASE_NAME=%~n0
14 | set APP_HOME=%DIRNAME%
15 |
16 | @rem Add default JVM options here. You can also use JAVA_OPTS and GRADLE_OPTS to pass JVM options to this script.
17 | set DEFAULT_JVM_OPTS=
18 |
19 | @rem Find java.exe
20 | if defined JAVA_HOME goto findJavaFromJavaHome
21 |
22 | set JAVA_EXE=java.exe
23 | %JAVA_EXE% -version >NUL 2>&1
24 | if "%ERRORLEVEL%" == "0" goto init
25 |
26 | echo.
27 | echo ERROR: JAVA_HOME is not set and no 'java' command could be found in your PATH.
28 | echo.
29 | echo Please set the JAVA_HOME variable in your environment to match the
30 | echo location of your Java installation.
31 |
32 | goto fail
33 |
34 | :findJavaFromJavaHome
35 | set JAVA_HOME=%JAVA_HOME:"=%
36 | set JAVA_EXE=%JAVA_HOME%/bin/java.exe
37 |
38 | if exist "%JAVA_EXE%" goto init
39 |
40 | echo.
41 | echo ERROR: JAVA_HOME is set to an invalid directory: %JAVA_HOME%
42 | echo.
43 | echo Please set the JAVA_HOME variable in your environment to match the
44 | echo location of your Java installation.
45 |
46 | goto fail
47 |
48 | :init
49 | @rem Get command-line arguments, handling Windows variants
50 |
51 | if not "%OS%" == "Windows_NT" goto win9xME_args
52 |
53 | :win9xME_args
54 | @rem Slurp the command line arguments.
55 | set CMD_LINE_ARGS=
56 | set _SKIP=2
57 |
58 | :win9xME_args_slurp
59 | if "x%~1" == "x" goto execute
60 |
61 | set CMD_LINE_ARGS=%*
62 |
63 | :execute
64 | @rem Setup the command line
65 |
66 | set CLASSPATH=%APP_HOME%\gradle\wrapper\gradle-wrapper.jar
67 |
68 | @rem Execute Gradle
69 | "%JAVA_EXE%" %DEFAULT_JVM_OPTS% %JAVA_OPTS% %GRADLE_OPTS% "-Dorg.gradle.appname=%APP_BASE_NAME%" -classpath "%CLASSPATH%" org.gradle.wrapper.GradleWrapperMain %CMD_LINE_ARGS%
70 |
71 | :end
72 | @rem End local scope for the variables with windows NT shell
73 | if "%ERRORLEVEL%"=="0" goto mainEnd
74 |
75 | :fail
76 | rem Set variable GRADLE_EXIT_CONSOLE if you need the _script_ return code instead of
77 | rem the _cmd.exe /c_ return code!
78 | if not "" == "%GRADLE_EXIT_CONSOLE%" exit 1
79 | exit /b 1
80 |
81 | :mainEnd
82 | if "%OS%"=="Windows_NT" endlocal
83 |
84 | :omega
85 |
--------------------------------------------------------------------------------
/inflate/EXPLANATION.md:
--------------------------------------------------------------------------------
1 | # Inflation result
2 |
3 | ## Answer
4 |
5 | B: parent and child
6 |
7 | ## More info
8 |
9 | Contrary to what you could expect, `LayoutInflater#inflate(int, ViewGroup)` doesn't always return the inflated `View`. Instead it returns the root of the inflated `View` which might be either the inflated `View` or, if non null, the provided parent `ViewGroup`.
10 |
11 | In practice, we generally favor `LayoutInflater#inflate(int, ViewGroup, boolean)` as the third argument allows for a clearer and more understandable code.
12 |
--------------------------------------------------------------------------------
/inflate/build.gradle:
--------------------------------------------------------------------------------
1 | apply from: puzzler
2 |
--------------------------------------------------------------------------------
/inflate/src/main/AndroidManifest.xml:
--------------------------------------------------------------------------------
1 |
2 |
6 |
7 |
12 |
13 |
14 |
15 |
16 |
17 |
18 |
19 |
20 |
21 |
22 |
23 |
--------------------------------------------------------------------------------
/inflate/src/main/java/com/cyrilmottier/android/puzzlers/MainActivity.kt:
--------------------------------------------------------------------------------
1 | package com.cyrilmottier.android.puzzlers
2 |
3 | import android.app.Activity
4 | import android.os.Bundle
5 | import android.widget.FrameLayout
6 | import com.cyrilmottier.android.puzzlers.base.trace
7 |
8 | class MainActivity : Activity() {
9 |
10 | override fun onCreate(savedInstanceState: Bundle?) {
11 | super.onCreate(savedInstanceState)
12 |
13 | val parent = FrameLayout(this).apply {
14 | tag = "parent"
15 | }
16 | val result1 = layoutInflater.inflate(R.layout.view_inflate, parent)
17 | val result2 = layoutInflater.inflate(R.layout.view_inflate, null)
18 |
19 | trace("${result1.tag} and ${result2.tag}")
20 | }
21 |
22 | }
23 |
24 | // What will it trace?
25 |
26 | // A: child and child
27 | // B: parent and child
28 | // C: throws NullPointerException
29 | // D: Answer D
30 |
--------------------------------------------------------------------------------
/inflate/src/main/res/layout/view_inflate.xml:
--------------------------------------------------------------------------------
1 |
2 |
6 |
--------------------------------------------------------------------------------
/lifecycle/EXPLANATION.md:
--------------------------------------------------------------------------------
1 | # Activity Lifecyle
2 |
3 | ## Answer
4 |
5 | D: onCreate, finish, onDestroy
6 |
7 | ## More info
8 |
9 | Android always ensures duality of the callbacks. So whenever an entering/creating method is called you can expect its exiting/destroying counterpart to be called too. As a consequence, you will never get `onCreate` without `onDestroy`.
10 |
11 | While the regular `Activity` lifecycle is `onCreate` -> `onStart` -> `onResume`, there's a special fast track when calling `finish` directly in `onCreate`: the system will be immediately calling `onDestroy` without any of the rest of the `Activity` lifecycle executing.
12 |
13 | ## Misc.
14 |
15 | This has been the case for at least Cupcake…
16 |
--------------------------------------------------------------------------------
/lifecycle/build.gradle:
--------------------------------------------------------------------------------
1 | apply from: puzzler
2 |
--------------------------------------------------------------------------------
/lifecycle/src/main/AndroidManifest.xml:
--------------------------------------------------------------------------------
1 |
2 |
6 |
7 |
12 |
13 |
14 |
15 |
16 |
17 |
18 |
19 |
20 |
21 |
22 |
23 |
--------------------------------------------------------------------------------
/lifecycle/src/main/java/com/cyrilmottier/android/puzzlers/MainActivity.kt:
--------------------------------------------------------------------------------
1 | package com.cyrilmottier.android.puzzlers
2 |
3 | import android.app.Activity
4 | import android.os.Bundle
5 | import com.cyrilmottier.android.puzzlers.base.trace
6 |
7 | class MainActivity : Activity() {
8 |
9 | override fun onCreate(savedInstanceState: Bundle?) {
10 | super.onCreate(savedInstanceState)
11 | trace("onCreate")
12 | finish()
13 | trace("finish")
14 | }
15 |
16 | override fun onStart() {
17 | super.onStart()
18 | trace("onStart")
19 | }
20 |
21 | override fun onResume() {
22 | super.onResume()
23 | trace("onResume")
24 | }
25 |
26 | override fun onPause() {
27 | trace("onPause")
28 | super.onPause()
29 | }
30 |
31 | override fun onStop() {
32 | trace("onStop")
33 | super.onStop()
34 | }
35 |
36 | override fun onDestroy() {
37 | trace("onDestroy")
38 | super.onDestroy()
39 | }
40 |
41 | }
42 |
43 | // What will it trace?
44 |
45 | // A: onCreate
46 | // B: onCreate, finish, onStart, onResume, onPause, onStop, onDestroy
47 | // C: onCreate, onStart, onResume, onPause, onStop, onDestroy
48 | // D: onCreate, finish, onDestroy
49 |
--------------------------------------------------------------------------------
/locale/EXPLANATION.md:
--------------------------------------------------------------------------------
1 | # Locale resolution
2 |
3 | ## Answer
4 |
5 | C: [en\_US,fr\_FR,es\_ES], en\_US, Bonjour monde !
6 |
7 | ## Explanations
8 |
9 | The system normally goes through the list of user-defined locale settings in order to do locale resolution. So user’s settings set to `[de_DE,fr_FR,es_ES]`, we will look at values in that order:
10 |
11 | 1. `de_DE`, `de` and children of `de` => No match
12 | 2. `fr_FR`, `fr` and children of `fr` => No match because the system doesn't know default values contains French translations.
13 | 3. `es_ES`, `es` and children of `es` => `values-es` matches
14 |
15 | We could expect the same output when having `[en_US,fr_FR,es_ES]` but that's not the case because the system will always consider an app as handling English if English is in the user's settings. In other words, we get:
16 |
17 | 1. `en_US`, `en` and children of `en` => We have a matching but because there's no `values-en` or `values-en-XX`, the system will use `values` hence displaying French in this case.
18 |
19 | ## Misc
20 |
21 | If you want more exemples, here are other combinations:
22 |
23 | - [it\_IT,fr\_FR,es\_ES] / es_ES / ¡Hola mundo!
24 | - [it\_IT,fr\_FR,es\_ES,en\_US] / es_ES / ¡Hola mundo!
25 | - [it\_IT,en\_US,fr\_FR,es\_ES] / en_US / Bonjour monde !
26 |
--------------------------------------------------------------------------------
/locale/build.gradle:
--------------------------------------------------------------------------------
1 | apply from: puzzler
2 |
3 | android {
4 | defaultConfig {
5 | resConfigs "es"
6 | }
7 | }
8 |
--------------------------------------------------------------------------------
/locale/src/main/AndroidManifest.xml:
--------------------------------------------------------------------------------
1 |
2 |
6 |
7 |
12 |
13 |
14 |
15 |
16 |
17 |
18 |
19 |
20 |
21 |
22 |
23 |
--------------------------------------------------------------------------------
/locale/src/main/java/com/cyrilmottier/android/puzzlers/MainActivity.kt:
--------------------------------------------------------------------------------
1 | package com.cyrilmottier.android.puzzlers
2 |
3 | import android.app.Activity
4 | import android.os.Bundle
5 | import android.os.LocaleList
6 | import com.cyrilmottier.android.puzzlers.base.trace
7 | import kotlinx.android.synthetic.main.activity_main.*
8 | import java.util.*
9 |
10 | class MainActivity : Activity() {
11 | override fun onCreate(savedInstanceState: Bundle?) {
12 | super.onCreate(savedInstanceState)
13 | setContentView(R.layout.activity_main)
14 |
15 | // User’s locale preferences are set to: en_US, fr_FR, es_ES
16 | trace("${LocaleList.getDefault()}, " +
17 | "${Locale.getDefault()}, ${text_view.text}"
18 | )
19 | }
20 | }
21 |
22 | // What will it trace?
23 |
24 | // A: [fr,es], fr, Bonjour monde !
25 | // B: [en_US,fr_FR,es_ES], fr_FR, Bonjour monde !
26 | // C: [en_US,fr_FR,es_ES], en_US, Bonjour monde !
27 | // D: Resources.NotFoundException
28 |
--------------------------------------------------------------------------------
/locale/src/main/res/layout/activity_main.xml:
--------------------------------------------------------------------------------
1 |
2 |
8 |
--------------------------------------------------------------------------------
/locale/src/main/res/values-es/strings.xml:
--------------------------------------------------------------------------------
1 |
2 | ¡Hola mundo!
3 |
4 |
--------------------------------------------------------------------------------
/locale/src/main/res/values/strings.xml:
--------------------------------------------------------------------------------
1 |
2 | Bonjour monde !
3 |
4 |
--------------------------------------------------------------------------------
/padding/EXPLANATION.md:
--------------------------------------------------------------------------------
1 | # Padding precedence
2 |
3 | ## Answer
4 |
5 | D: start=11 top=5 end=7 bottom=5
6 |
7 | ## More info
8 |
9 | Android offers a bunch of padding-related XML attributes. And there is obviously a precedence table for them. This order of precedence actually depends on whether the app supports RTL or not. In our case it does so the order if (from the lowest precedence to the highest one):
10 |
11 | 1. background `Drawable` padding
12 | 2. `paddingLeft` / `paddingTop` / `paddingRight` / `paddingBottom`
13 | 3. `paddingHorizontal` / `paddingVertical`
14 | 4. `padding`
15 | 5. `paddingStart` / `paddingEnd`
16 |
17 | When `android:supportsRtl="false"`, the order table is as follows:
18 |
19 | 1. background `Drawable` padding
20 | 2. `paddingStart` / `paddingEnd`
21 | 3. `paddingLeft` / `paddingTop` / `paddingRight` / `paddingBottom`
22 | 4. `paddingHorizontal` / `paddingVertical`
23 | 5. `padding`
24 |
25 | ## Misc
26 |
27 | - `android:paddingHorizontal` and `android:paddingVertical` have been introduced in API 26 and are backported thanks to AAPT2 (v2.16) to `android:paddingLeft` and `android:paddingRight`. You can take a look at https://github.com/aosp-mirror/platform_frameworks_base/blob/6bebb8418ceecf44d2af40033870f3aabacfe36e/tools/aapt2/cmd/Link.cpp#L369-L420
28 |
--------------------------------------------------------------------------------
/padding/build.gradle:
--------------------------------------------------------------------------------
1 | apply from: puzzler
2 |
--------------------------------------------------------------------------------
/padding/src/main/AndroidManifest.xml:
--------------------------------------------------------------------------------
1 |
2 |
6 |
7 |
12 |
13 |
14 |
15 |
16 |
17 |
18 |
19 |
20 |
21 |
22 |
23 |
--------------------------------------------------------------------------------
/padding/src/main/java/com/cyrilmottier/android/puzzlers/MainActivity.kt:
--------------------------------------------------------------------------------
1 | package com.cyrilmottier.android.puzzlers
2 |
3 | import android.app.Activity
4 | import android.os.Bundle
5 | import com.cyrilmottier.android.puzzlers.base.trace
6 | import kotlinx.android.synthetic.main.activity_main.*
7 |
8 | class MainActivity : Activity() {
9 | override fun onCreate(savedInstanceState: Bundle?) {
10 | super.onCreate(savedInstanceState)
11 | setContentView(R.layout.activity_main)
12 | trace(
13 | "start=${text.paddingStart} " +
14 | "top=${text.paddingTop} " +
15 | "end=${text.paddingEnd} " +
16 | "bottom=${text.paddingBottom}"
17 | )
18 | }
19 | }
20 |
21 | // What will it trace?
22 |
23 | // A: start=5 top=5 end=5 bottom=5
24 | // B: start=9 top=5 end=10 bottom=6
25 | // C: start=2 top=4 end=3 bottom=1
26 | // D: start=11 top=5 end=7 bottom=5
27 |
--------------------------------------------------------------------------------
/padding/src/main/res/drawable/padded_rect.xml:
--------------------------------------------------------------------------------
1 |
2 |
3 |
4 |
9 |
10 |
11 |
--------------------------------------------------------------------------------
/padding/src/main/res/layout/activity_main.xml:
--------------------------------------------------------------------------------
1 |
2 |
17 |
--------------------------------------------------------------------------------
/prefererences/EXPLANATION.md:
--------------------------------------------------------------------------------
1 | # Preferences read/write
2 |
3 | ## Answer
4 |
5 | A: Go to heaven!
6 |
7 | ## More info
8 |
9 | `SharedPreferences` `apply()` writes info on disk asynchronously but the system always assures that reads are always done returning the current value in memory (i.e. the latest value applied). So answer D is not an option.
10 |
11 | The system also assures that SharedPreferences are always saved regardless of the process lifecycle. For instance, if the process is killed, the system will first ensure in-memory data is written on disk.
12 |
13 | Finally, `SharedPreferences` accepts "null" as a value but always consider null values as inexistant. Hence, if a value is `null`, it will returns the provided default if any.
14 |
--------------------------------------------------------------------------------
/prefererences/build.gradle:
--------------------------------------------------------------------------------
1 | apply from: puzzler
2 |
--------------------------------------------------------------------------------
/prefererences/src/main/AndroidManifest.xml:
--------------------------------------------------------------------------------
1 |
2 |
4 |
5 |
10 |
11 |
12 |
13 |
14 |
15 |
16 |
17 |
18 |
19 |
20 |
21 |
--------------------------------------------------------------------------------
/prefererences/src/main/java/com/cyrilmottier/android/puzzlers/MainActivity.kt:
--------------------------------------------------------------------------------
1 | package com.cyrilmottier.android.puzzlers
2 |
3 | import android.app.Activity
4 | import android.content.Context
5 | import android.os.Bundle
6 | import com.cyrilmottier.android.puzzlers.base.trace
7 |
8 | class MainActivity : Activity() {
9 |
10 | override fun onCreate(savedInstanceState: Bundle?) {
11 | super.onCreate(savedInstanceState)
12 |
13 | val prefs = getSharedPreferences("test", Context.MODE_PRIVATE)
14 |
15 | prefs.edit()
16 | .putString("key", "hell")
17 | .apply()
18 |
19 | prefs.edit()
20 | .putString("key", null)
21 | .apply()
22 |
23 | val value = prefs.getString("key", "heaven")
24 | trace("Go to $value!")
25 | }
26 |
27 | }
28 |
29 | // What will it trace?
30 |
31 | // A: Go to heaven!
32 | // B: Go to hell!
33 | // C: Go to null!
34 | // D: Either A, B or C
35 |
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/settings.gradle:
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1 | include ":base"
2 |
3 | include ":channels"
4 | include ":detach"
5 | include ":drawable"
6 | include ":inflate"
7 | include ":lifecycle"
8 | include ":locale"
9 | include ":padding"
10 | include ':prefererences'
11 | include ':weight'
12 |
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/weight/EXPLANATION.md:
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1 | # LinearLayout weight
2 |
3 | ## Answer
4 |
5 | A: LL: 400px, TV1: 267px, TV2: 133px
6 |
7 | ## More info
8 |
9 | LinearLayout uses the following formula to compute children width:
10 |
11 | ```
12 | finalWidth = computedWidth + delta * weight / weightSum
13 | ```
14 |
15 | So we have `delta` defined as `400 - 500 = -100`. `weightSum` being `3`, TV1 width will be `300 - 100 * 1/3 = 267` and TV2 width will be `200 - 100 * 2/3 = 133`
16 |
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/weight/build.gradle:
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1 | apply from: puzzler
2 |
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/weight/src/main/AndroidManifest.xml:
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1 |
2 |
6 |
7 |
12 |
13 |
14 |
15 |
16 |
17 |
18 |
19 |
20 |
21 |
22 |
23 |
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/weight/src/main/java/com/cyrilmottier/android/puzzlers/MainActivity.kt:
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1 | package com.cyrilmottier.android.puzzlers
2 |
3 | import android.app.Activity
4 | import android.os.Bundle
5 | import com.cyrilmottier.android.puzzlers.base.trace
6 | import kotlinx.android.synthetic.main.activity_main.*
7 |
8 | class MainActivity : Activity() {
9 | override fun onCreate(savedInstanceState: Bundle?) {
10 | super.onCreate(savedInstanceState)
11 | setContentView(R.layout.activity_main)
12 | linear_layout.addOnLayoutChangeListener { v, _, _, _, _, _, _, _, _ ->
13 | trace(
14 | "LL: ${linear_layout.width}px, " +
15 | "TV1: ${text_view_1.width}px, " +
16 | "TV2: ${text_view_2.width}px"
17 | )
18 | }
19 | }
20 | }
21 |
22 |
23 | // What will it trace?
24 |
25 | // A: LL: 400px, TV1: 267px, TV2: 133px
26 | // B: LL: 500px, TV1: 300px, TV2: 200px
27 | // C: LL: 400px, TV1: 233px, TV2: 167px
28 | // D: LL: 400px, TV1: 300px, TV2: 200px
29 |
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/weight/src/main/res/layout/activity_main.xml:
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1 |
2 |
6 |
7 |
14 |
15 |
22 |
23 |
24 |
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