├── app ├── .gitignore ├── src │ └── main │ │ ├── res │ │ ├── values │ │ │ ├── strings.xml │ │ │ ├── colors.xml │ │ │ └── styles.xml │ │ ├── mipmap-hdpi │ │ │ ├── ic_launcher.png │ │ │ └── ic_launcher_round.png │ │ ├── mipmap-mdpi │ │ │ ├── ic_launcher.png │ │ │ └── ic_launcher_round.png │ │ ├── mipmap-xhdpi │ │ │ ├── ic_launcher.png │ │ │ └── ic_launcher_round.png │ │ ├── mipmap-xxhdpi │ │ │ ├── ic_launcher.png │ │ │ └── ic_launcher_round.png │ │ ├── mipmap-xxxhdpi │ │ │ ├── ic_launcher.png │ │ │ └── ic_launcher_round.png │ │ ├── drawable │ │ │ └── shape.xml │ │ └── layout │ │ │ └── activity_main.xml │ │ ├── java │ │ └── com │ │ │ └── zhuyong │ │ │ └── pointloading │ │ │ ├── Point.java │ │ │ ├── MainActivity.java │ │ │ └── PointLoadingView.java │ │ └── AndroidManifest.xml ├── proguard-rules.pro └── build.gradle ├── settings.gradle ├── art └── PointLoading.gif ├── .idea ├── copyright │ └── profiles_settings.xml ├── modules.xml ├── runConfigurations.xml ├── gradle.xml ├── compiler.xml └── misc.xml ├── gradle └── wrapper │ ├── gradle-wrapper.jar │ └── gradle-wrapper.properties ├── .gitignore ├── README.md ├── gradle.properties ├── gradlew.bat └── gradlew /app/.gitignore: -------------------------------------------------------------------------------- 1 | /build 2 | -------------------------------------------------------------------------------- /settings.gradle: -------------------------------------------------------------------------------- 1 | include ':app' 2 | -------------------------------------------------------------------------------- /art/PointLoading.gif: -------------------------------------------------------------------------------- https://raw.githubusercontent.com/SuperKotlin/PointLoadingView/HEAD/art/PointLoading.gif -------------------------------------------------------------------------------- /.idea/copyright/profiles_settings.xml: -------------------------------------------------------------------------------- 1 | 2 | 3 | -------------------------------------------------------------------------------- /app/src/main/res/values/strings.xml: -------------------------------------------------------------------------------- 1 | 2 | PointLoading 3 | 4 | -------------------------------------------------------------------------------- /gradle/wrapper/gradle-wrapper.jar: -------------------------------------------------------------------------------- https://raw.githubusercontent.com/SuperKotlin/PointLoadingView/HEAD/gradle/wrapper/gradle-wrapper.jar -------------------------------------------------------------------------------- /app/src/main/res/mipmap-hdpi/ic_launcher.png: -------------------------------------------------------------------------------- https://raw.githubusercontent.com/SuperKotlin/PointLoadingView/HEAD/app/src/main/res/mipmap-hdpi/ic_launcher.png -------------------------------------------------------------------------------- /app/src/main/res/mipmap-mdpi/ic_launcher.png: 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-------------------------------------------------------------------------------- 1 | *.iml 2 | .gradle 3 | /local.properties 4 | /.idea/workspace.xml 5 | /.idea/libraries 6 | .DS_Store 7 | /build 8 | /captures 9 | .externalNativeBuild 10 | -------------------------------------------------------------------------------- /app/src/main/res/drawable/shape.xml: -------------------------------------------------------------------------------- 1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 | -------------------------------------------------------------------------------- /gradle/wrapper/gradle-wrapper.properties: -------------------------------------------------------------------------------- 1 | #Wed Jul 19 09:46:50 CST 2017 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-3.3-all.zip 7 | -------------------------------------------------------------------------------- /app/src/main/res/values/colors.xml: -------------------------------------------------------------------------------- 1 | 2 | 3 | #3F51B5 4 | #303F9F 5 | #FF4081 6 | #1A6AAF 7 | 8 | -------------------------------------------------------------------------------- /README.md: -------------------------------------------------------------------------------- 1 | #PointLoadingView 2 | #进来的兄弟姐妹们可否点一下star再走~感谢 3 | ### 效果图预览 4 | ![](/art/PointLoading.gif) 5 | ### 详细博客介绍地址： [自定义View_利用贝塞尔曲线实现跳跃的小球](http://www.jianshu.com/p/2b0a53957bb5) 6 | ### 关于我 7 | - 我的简书：[BraveJoy](http://www.jianshu.com/users/c96d2a9d160f/timeline) 8 | - 我的github：[SuperKotlin](https://github.com/SuperKotlin) -------------------------------------------------------------------------------- /.idea/modules.xml: -------------------------------------------------------------------------------- 1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 | 9 | -------------------------------------------------------------------------------- /app/src/main/res/values/styles.xml: -------------------------------------------------------------------------------- 1 | 2 | 3 | 4 | 10 | 11 | 12 | -------------------------------------------------------------------------------- /.idea/runConfigurations.xml: -------------------------------------------------------------------------------- 1 | 2 | 3 | 4 | 11 | 12 | -------------------------------------------------------------------------------- /.idea/gradle.xml: -------------------------------------------------------------------------------- 1 | 2 | 3 | 4 | 17 | 18 | -------------------------------------------------------------------------------- /app/src/main/java/com/zhuyong/pointloading/Point.java: -------------------------------------------------------------------------------- 1 | package com.zhuyong.pointloading; 2 | 3 | /** 4 | * Created by zhuyong on 2017/7/18. 5 | */ 6 | 7 | public class Point { 8 | 9 | // 设置两个变量用于记录坐标的位置 10 | private float x; 11 | private float y; 12 | 13 | // 构造方法用于设置坐标 14 | public Point(float x, float y) { 15 | this.x = x; 16 | this.y = y; 17 | } 18 | 19 | // get方法用于获取坐标 20 | public float getX() { 21 | return x; 22 | } 23 | 24 | public float getY() { 25 | return y; 26 | } 27 | 28 | public void setX(float x) { 29 | this.x = x; 30 | } 31 | 32 | public void setY(float y) { 33 | this.y = y; 34 | } 35 | } 36 | -------------------------------------------------------------------------------- /.idea/compiler.xml: -------------------------------------------------------------------------------- 1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 | 9 | 10 | 11 | 12 | 13 | 14 | 15 | 16 | 17 | 18 | 19 | 20 | 21 | 22 | -------------------------------------------------------------------------------- /app/src/main/java/com/zhuyong/pointloading/MainActivity.java: -------------------------------------------------------------------------------- 1 | package com.zhuyong.pointloading; 2 | 3 | import android.support.v7.app.AppCompatActivity; 4 | import android.os.Bundle; 5 | 6 | public class MainActivity extends AppCompatActivity { 7 | private PointLoadingView mPointLoadingView; 8 | 9 | @Override 10 | protected void onCreate(Bundle savedInstanceState) { 11 | super.onCreate(savedInstanceState); 12 | setContentView(R.layout.activity_main); 13 | mPointLoadingView = (PointLoadingView) findViewById(R.id.BeisaierTwoView); 14 | mPointLoadingView.post(new Runnable() { 15 | @Override 16 | public void run() { 17 | mPointLoadingView.Startdown(); 18 | } 19 | }); 20 | } 21 | } 22 | -------------------------------------------------------------------------------- /gradle.properties: -------------------------------------------------------------------------------- 1 | # Project-wide Gradle settings. 2 | 3 | # IDE (e.g. Android Studio) users: 4 | # Gradle settings configured through the IDE *will override* 5 | # any settings specified in this file. 6 | 7 | # For more details on how to configure your build environment visit 8 | # http://www.gradle.org/docs/current/userguide/build_environment.html 9 | 10 | # Specifies the JVM arguments used for the daemon process. 11 | # The setting is particularly useful for tweaking memory settings. 12 | org.gradle.jvmargs=-Xmx1536m 13 | 14 | # When configured, Gradle will run in incubating parallel mode. 15 | # This option should only be used with decoupled projects. More details, visit 16 | # http://www.gradle.org/docs/current/userguide/multi_project_builds.html#sec:decoupled_projects 17 | # org.gradle.parallel=true 18 | -------------------------------------------------------------------------------- /app/src/main/AndroidManifest.xml: -------------------------------------------------------------------------------- 1 | 2 | 4 | 5 | 12 | 13 | 14 | 15 | 16 | 17 | 18 | 19 | 20 | 21 | -------------------------------------------------------------------------------- /app/src/main/res/layout/activity_main.xml: -------------------------------------------------------------------------------- 1 | 2 | 8 | 9 | 17 | 18 | 19 | -------------------------------------------------------------------------------- /app/proguard-rules.pro: -------------------------------------------------------------------------------- 1 | # Add project specific ProGuard rules here. 2 | # By default, the flags in this file are appended to flags specified 3 | # in C:\Users\zhuyong\AppData\Local\Android\Sdk/tools/proguard/proguard-android.txt 4 | # You can edit the include path and order by changing the proguardFiles 5 | # directive in build.gradle. 6 | # 7 | # For more details, see 8 | # http://developer.android.com/guide/developing/tools/proguard.html 9 | 10 | # Add any project specific keep options here: 11 | 12 | # If your project uses WebView with JS, uncomment the following 13 | # and specify the fully qualified class name to the JavaScript interface 14 | # class: 15 | #-keepclassmembers class fqcn.of.javascript.interface.for.webview { 16 | # public *; 17 | #} 18 | 19 | # Uncomment this to preserve the line number information for 20 | # debugging stack traces. 21 | #-keepattributes SourceFile,LineNumberTable 22 | 23 | # If you keep the line number information, uncomment this to 24 | # hide the original source file name. 25 | #-renamesourcefileattribute SourceFile 26 | -------------------------------------------------------------------------------- /app/build.gradle: -------------------------------------------------------------------------------- 1 | apply plugin: 'com.android.application' 2 | 3 | android { 4 | compileSdkVersion 26 5 | buildToolsVersion "26.0.0" 6 | defaultConfig { 7 | applicationId "com.zhuyong.pointloading" 8 | minSdkVersion 15 9 | targetSdkVersion 26 10 | versionCode 1 11 | versionName "1.0" 12 | testInstrumentationRunner "android.support.test.runner.AndroidJUnitRunner" 13 | } 14 | buildTypes { 15 | release { 16 | minifyEnabled false 17 | proguardFiles getDefaultProguardFile('proguard-android.txt'), 'proguard-rules.pro' 18 | } 19 | } 20 | } 21 | 22 | dependencies { 23 | compile fileTree(dir: 'libs', include: ['*.jar']) 24 | androidTestCompile('com.android.support.test.espresso:espresso-core:2.2.2', { 25 | exclude group: 'com.android.support', module: 'support-annotations' 26 | }) 27 | compile 'com.android.support:appcompat-v7:26.+' 28 | compile 'com.android.support.constraint:constraint-layout:1.0.2' 29 | testCompile 'junit:junit:4.12' 30 | } 31 | -------------------------------------------------------------------------------- /.idea/misc.xml: -------------------------------------------------------------------------------- 1 | 2 | 3 | 4 | 5 | 6 | 7 | 19 | 29 | 30 | 31 | 32 | 33 | 34 | 35 | 36 | 37 | 38 | 39 | 40 | 41 | 42 | 43 | 44 | 46 | -------------------------------------------------------------------------------- /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 | @rem Add default JVM options here. You can also use JAVA_OPTS and GRADLE_OPTS to pass JVM options to this script. 12 | set DEFAULT_JVM_OPTS= 13 | 14 | set DIRNAME=%~dp0 15 | if "%DIRNAME%" == "" set DIRNAME=. 16 | set APP_BASE_NAME=%~n0 17 | set APP_HOME=%DIRNAME% 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 Windowz variants 50 | 51 | if not "%OS%" == "Windows_NT" goto win9xME_args 52 | if "%@eval[2+2]" == "4" goto 4NT_args 53 | 54 | :win9xME_args 55 | @rem Slurp the command line arguments. 56 | set CMD_LINE_ARGS= 57 | set _SKIP=2 58 | 59 | :win9xME_args_slurp 60 | if "x%~1" == "x" goto execute 61 | 62 | set CMD_LINE_ARGS=%* 63 | goto execute 64 | 65 | :4NT_args 66 | @rem Get arguments from the 4NT Shell from JP Software 67 | set CMD_LINE_ARGS=%$ 68 | 69 | :execute 70 | @rem Setup the command line 71 | 72 | set CLASSPATH=%APP_HOME%\gradle\wrapper\gradle-wrapper.jar 73 | 74 | @rem Execute Gradle 75 | "%JAVA_EXE%" %DEFAULT_JVM_OPTS% %JAVA_OPTS% %GRADLE_OPTS% "-Dorg.gradle.appname=%APP_BASE_NAME%" -classpath "%CLASSPATH%" org.gradle.wrapper.GradleWrapperMain %CMD_LINE_ARGS% 76 | 77 | :end 78 | @rem End local scope for the variables with windows NT shell 79 | if "%ERRORLEVEL%"=="0" goto mainEnd 80 | 81 | :fail 82 | rem Set variable GRADLE_EXIT_CONSOLE if you need the _script_ return code instead of 83 | rem the _cmd.exe /c_ return code! 84 | if not "" == "%GRADLE_EXIT_CONSOLE%" exit 1 85 | exit /b 1 86 | 87 | :mainEnd 88 | if "%OS%"=="Windows_NT" endlocal 89 | 90 | :omega 91 | -------------------------------------------------------------------------------- /gradlew: -------------------------------------------------------------------------------- 1 | #!/usr/bin/env bash 2 | 3 | ############################################################################## 4 | ## 5 | ## Gradle start up script for UN*X 6 | ## 7 | ############################################################################## 8 | 9 | # Add default JVM options here. You can also use JAVA_OPTS and GRADLE_OPTS to pass JVM options to this script. 10 | DEFAULT_JVM_OPTS="" 11 | 12 | APP_NAME="Gradle" 13 | APP_BASE_NAME=`basename "$0"` 14 | 15 | # Use the maximum available, or set MAX_FD != -1 to use that value. 16 | MAX_FD="maximum" 17 | 18 | warn ( ) { 19 | echo "$*" 20 | } 21 | 22 | die ( ) { 23 | echo 24 | echo "$*" 25 | echo 26 | exit 1 27 | } 28 | 29 | # OS specific support (must be 'true' or 'false'). 30 | cygwin=false 31 | msys=false 32 | darwin=false 33 | case "`uname`" in 34 | CYGWIN* ) 35 | cygwin=true 36 | ;; 37 | Darwin* ) 38 | darwin=true 39 | ;; 40 | MINGW* ) 41 | msys=true 42 | ;; 43 | esac 44 | 45 | # Attempt to set APP_HOME 46 | # Resolve links: $0 may be a link 47 | PRG="$0" 48 | # Need this for relative symlinks. 49 | while [ -h "$PRG" ] ; do 50 | ls=`ls -ld "$PRG"` 51 | link=`expr "$ls" : '.*-> \(.*\)$'` 52 | if expr "$link" : '/.*' > /dev/null; then 53 | PRG="$link" 54 | else 55 | PRG=`dirname "$PRG"`"/$link" 56 | fi 57 | done 58 | SAVED="`pwd`" 59 | cd "`dirname \"$PRG\"`/" >/dev/null 60 | APP_HOME="`pwd -P`" 61 | cd "$SAVED" >/dev/null 62 | 63 | CLASSPATH=$APP_HOME/gradle/wrapper/gradle-wrapper.jar 64 | 65 | # Determine the Java command to use to start the JVM. 66 | if [ -n "$JAVA_HOME" ] ; then 67 | if [ -x "$JAVA_HOME/jre/sh/java" ] ; then 68 | # IBM's JDK on AIX uses strange locations for the executables 69 | JAVACMD="$JAVA_HOME/jre/sh/java" 70 | else 71 | JAVACMD="$JAVA_HOME/bin/java" 72 | fi 73 | if [ ! -x "$JAVACMD" ] ; then 74 | die "ERROR: JAVA_HOME is set to an invalid directory: $JAVA_HOME 75 | 76 | Please set the JAVA_HOME variable in your environment to match the 77 | location of your Java installation." 78 | fi 79 | else 80 | JAVACMD="java" 81 | which java >/dev/null 2>&1 || die "ERROR: JAVA_HOME is not set and no 'java' command could be found in your PATH. 82 | 83 | Please set the JAVA_HOME variable in your environment to match the 84 | location of your Java installation." 85 | fi 86 | 87 | # Increase the maximum file descriptors if we can. 88 | if [ "$cygwin" = "false" -a "$darwin" = "false" ] ; then 89 | MAX_FD_LIMIT=`ulimit -H -n` 90 | if [ $? -eq 0 ] ; then 91 | if [ "$MAX_FD" = "maximum" -o "$MAX_FD" = "max" ] ; then 92 | MAX_FD="$MAX_FD_LIMIT" 93 | fi 94 | ulimit -n $MAX_FD 95 | if [ $? -ne 0 ] ; then 96 | warn "Could not set maximum file descriptor limit: $MAX_FD" 97 | fi 98 | else 99 | warn "Could not query maximum file descriptor limit: $MAX_FD_LIMIT" 100 | fi 101 | fi 102 | 103 | # For Darwin, add options to specify how the application appears in the dock 104 | if $darwin; then 105 | GRADLE_OPTS="$GRADLE_OPTS \"-Xdock:name=$APP_NAME\" \"-Xdock:icon=$APP_HOME/media/gradle.icns\"" 106 | fi 107 | 108 | # For Cygwin, switch paths to Windows format before running java 109 | if $cygwin ; then 110 | APP_HOME=`cygpath --path --mixed "$APP_HOME"` 111 | CLASSPATH=`cygpath --path --mixed "$CLASSPATH"` 112 | JAVACMD=`cygpath --unix "$JAVACMD"` 113 | 114 | # We build the pattern for arguments to be converted via cygpath 115 | ROOTDIRSRAW=`find -L / -maxdepth 1 -mindepth 1 -type d 2>/dev/null` 116 | SEP="" 117 | for dir in $ROOTDIRSRAW ; do 118 | ROOTDIRS="$ROOTDIRS$SEP$dir" 119 | SEP="|" 120 | done 121 | OURCYGPATTERN="(^($ROOTDIRS))" 122 | # Add a user-defined pattern to the cygpath arguments 123 | if [ "$GRADLE_CYGPATTERN" != "" ] ; then 124 | OURCYGPATTERN="$OURCYGPATTERN|($GRADLE_CYGPATTERN)" 125 | fi 126 | # Now convert the arguments - kludge to limit ourselves to /bin/sh 127 | i=0 128 | for arg in "$@" ; do 129 | CHECK=`echo "$arg"|egrep -c "$OURCYGPATTERN" -` 130 | CHECK2=`echo "$arg"|egrep -c "^-"` ### Determine if an option 131 | 132 | if [ $CHECK -ne 0 ] && [ $CHECK2 -eq 0 ] ; then ### Added a condition 133 | eval `echo args$i`=`cygpath --path --ignore --mixed "$arg"` 134 | else 135 | eval `echo args$i`="\"$arg\"" 136 | fi 137 | i=$((i+1)) 138 | done 139 | case $i in 140 | (0) set -- ;; 141 | (1) set -- "$args0" ;; 142 | (2) set -- "$args0" "$args1" ;; 143 | (3) set -- "$args0" "$args1" "$args2" ;; 144 | (4) set -- "$args0" "$args1" "$args2" "$args3" ;; 145 | (5) set -- "$args0" "$args1" "$args2" "$args3" "$args4" ;; 146 | (6) set -- "$args0" "$args1" "$args2" "$args3" "$args4" "$args5" ;; 147 | (7) set -- "$args0" "$args1" "$args2" "$args3" "$args4" "$args5" "$args6" ;; 148 | (8) set -- "$args0" "$args1" "$args2" "$args3" "$args4" "$args5" "$args6" "$args7" ;; 149 | (9) set -- "$args0" "$args1" "$args2" "$args3" "$args4" "$args5" "$args6" "$args7" "$args8" ;; 150 | esac 151 | fi 152 | 153 | # Split up the JVM_OPTS And GRADLE_OPTS values into an array, following the shell quoting and substitution rules 154 | function splitJvmOpts() { 155 | JVM_OPTS=("$@") 156 | } 157 | eval splitJvmOpts $DEFAULT_JVM_OPTS $JAVA_OPTS $GRADLE_OPTS 158 | JVM_OPTS[${#JVM_OPTS[*]}]="-Dorg.gradle.appname=$APP_BASE_NAME" 159 | 160 | exec "$JAVACMD" "${JVM_OPTS[@]}" -classpath "$CLASSPATH" org.gradle.wrapper.GradleWrapperMain "$@" 161 | -------------------------------------------------------------------------------- /app/src/main/java/com/zhuyong/pointloading/PointLoadingView.java: -------------------------------------------------------------------------------- 1 | package com.zhuyong.pointloading; 2 | 3 | import android.animation.Animator; 4 | import android.animation.AnimatorListenerAdapter; 5 | import android.animation.ValueAnimator; 6 | import android.content.Context; 7 | import android.graphics.Canvas; 8 | import android.graphics.Color; 9 | import android.graphics.Paint; 10 | import android.graphics.Path; 11 | import android.support.v4.content.ContextCompat; 12 | import android.util.AttributeSet; 13 | import android.util.Log; 14 | import android.view.View; 15 | import android.view.animation.AccelerateInterpolator; 16 | import android.view.animation.DecelerateInterpolator; 17 | 18 | /** 19 | * 贝塞尔曲线控件 20 | * Created by zhuyong on 2017/7/18. 21 | * 实现思想： 22 | * 1.我们把整个过程分为两个部分：第一部分是小球从最高点下降到最低点，第二部分是从最低点再弹跳到最高点，如此反复； 23 | * 2.第一个部分：我只要判断当球体接触到绳子的瞬间使小球和绳子接触着一起下降到最低点即可。 24 | * 3.第二个部分：小球正常弹起，在球线分离之前，绳子和小球都是一块上升，球线分离之后绳子开始回弹再回弹~ 25 | * 备注：这里面最难处理的就是曲线的状态，我们考虑用二阶贝塞尔曲线来做，只要动态改变曲线的控制点坐标即可， 26 | * 而这个控制点的坐标可以根据曲线的中心点坐标（就是绳子的中点）套用贝塞尔曲线公式求得，所以我们只要根据 27 | * 小球的圆心坐标来求出绳子中点坐标，进而求出控制点来绘制贝塞尔曲线即可。 28 | */ 29 | 30 | public class PointLoadingView extends View { 31 | private Paint paintCircle;//绘制弹跳小球 32 | private Paint paintPoint;//绘制端点两个空心小圆 33 | private Paint paintPointWhite;//绘制两个实心小圆用于填充端点空白处 34 | 35 | private int mPaintWidth = 10;//线的宽度 36 | private Point start;//左端点坐标 37 | private Point end;//右端点坐标 38 | private float mY;//弹跳小球圆心坐标 39 | private ValueAnimator mAnimatorDown;//下降动画 40 | private ValueAnimator mAnimatorUp;//上升动画 41 | private int TIME = 1500;//动画执行时长（小球从最低点弹到最高点所用时间，也是从最高点降落到最低点所用时间） 42 | private float mBerSaiErY;//贝塞尔曲线的控制点的Y坐标 43 | private int mViewWidth;//view宽度 44 | private int mViewHeight;//view高度 45 | private int mJumpHeight = 400;//小球跳起的最大高度，默认400dp，如果满足不了要求再根据view高度进行极端 46 | private int mDownPx = 100;//绳子下降的距离，默认100px，如果高度不允许再进行计算压缩高度 47 | private int mPointRadius = 40;//小球半径，40个像素 48 | 49 | public PointLoadingView(Context context) { 50 | this(context, null); 51 | } 52 | 53 | public PointLoadingView(Context context, AttributeSet attrs) { 54 | this(context, attrs, 0); 55 | } 56 | 57 | public PointLoadingView(Context context, AttributeSet attrs, int defStyleAttr) { 58 | super(context, attrs, defStyleAttr); 59 | init(context); 60 | } 61 | 62 | private void init(Context context) { 63 | //绘制两个空心的端点，和贝塞尔曲线 64 | paintPoint = new Paint(); 65 | paintPoint.setColor(Color.WHITE); 66 | paintPoint.setStyle(Paint.Style.STROKE); 67 | paintPoint.setStrokeWidth(mPaintWidth); 68 | paintPoint.setAntiAlias(true); 69 | //绘制两个实心的小球用于填充两个端点的空白处，颜色和背景色相同，造成透明效果 70 | paintPointWhite = new Paint(); 71 | paintPointWhite.setColor(ContextCompat.getColor(context, R.color.mPointViewBgColor)); 72 | paintPointWhite.setStyle(Paint.Style.FILL); 73 | paintPointWhite.setStrokeWidth(mPaintWidth); 74 | paintPointWhite.setAntiAlias(true); 75 | //绘制弹跳小球的画笔，白色、填充 76 | paintCircle = new Paint(); 77 | paintCircle.setColor(Color.WHITE); 78 | paintCircle.setStyle(Paint.Style.FILL); 79 | paintCircle.setStrokeWidth(mPaintWidth); 80 | paintCircle.setAntiAlias(true); 81 | 82 | } 83 | 84 | @Override 85 | protected void onDraw(Canvas canvas) { 86 | super.onDraw(canvas); 87 | Path path = new Path(); 88 | //设置起点 89 | path.moveTo(start.getX(), mViewHeight / 2); 90 | path.quadTo(mViewWidth / 2, mBerSaiErY, end.getX(), end.getY()); 91 | canvas.drawPath(path, paintPoint); 92 | //绘制两个端点 93 | canvas.drawCircle(start.getX(), start.getY(), 12, paintPoint); 94 | canvas.drawCircle(end.getX(), end.getY(), 12, paintPoint); 95 | //绘制两个实心的小球用于填充两个端点的空白处 96 | canvas.drawCircle(start.getX(), start.getY(), 12 - mPaintWidth / 2, paintPointWhite); 97 | canvas.drawCircle(end.getX(), end.getY(), 12 - mPaintWidth / 2, paintPointWhite); 98 | //绘制弹跳的小球 99 | canvas.drawCircle(mViewWidth / 2, mY, mPointRadius, paintCircle); 100 | } 101 | 102 | @Override 103 | protected void onLayout(boolean changed, int left, int top, int right, int bottom) { 104 | super.onLayout(changed, left, top, right, bottom); 105 | mY = mViewHeight / 2 - mJumpHeight;//小球圆心坐标（X坐标不变，Y坐标等于view高度的一半减去弹跳高度） 106 | mBerSaiErY = mViewHeight / 2;//贝塞尔曲线控制点坐标（X坐标不变，在最开始的时候，Y坐标等于view高度的一半） 107 | start = new Point(0 + 10 + mPaintWidth + getPaddingLeft(), mViewHeight / 2);//左端点 108 | end = new Point(mViewWidth - 10 - mPaintWidth - getPaddingRight(), mViewHeight / 2);//右端点 109 | //这里判断mJumpHeight能不能达到需要的高度，如果不行则根据view高度重新计算（跳起高度最大不能超过view高度的一半减去小球的半径） 110 | if (mJumpHeight > mViewHeight / 2 - mPointRadius / 2) { 111 | mJumpHeight = mViewHeight / 2 - mPointRadius;//为什么减去直径而不是半径，因为小球弹起的起点高度是从半径开始的 112 | } 113 | //为什么是3倍，因为这个过程中球上升的高度是100的3倍，就像我们默认是绳子下降100个像素， 114 | // 然后上升100个像素后球线分离，线再下降150个像素，线在上升50个像素到最后绳子静止，而这个过程中球上升的高度是300个像素 115 | if (mJumpHeight <= 3 * mDownPx) {//球上升的最大高度必须大于3倍的绳子下降最低距离，这里减去10个像素之差，否则绳子会失去弹性效果 116 | mDownPx = mJumpHeight / 3 - 10; 117 | } 118 | initAnimator(); 119 | } 120 | 121 | @Override 122 | protected void onSizeChanged(int w, int h, int oldw, int oldh) { 123 | super.onSizeChanged(w, h, oldw, oldh); 124 | mViewWidth = w; 125 | mViewHeight = h; 126 | } 127 | 128 | 129 | /** 130 | * 初始化动画 131 | */ 132 | private void initAnimator() { 133 | //(下降过程部分) 134 | //功能：球从最高处降落到最低处 135 | //这个过程中需要考虑两个过程，一是球下降到接触绳子之前，二是接触绳子之后一直到下降到最低点然后结束。 136 | //mY的范围是从最高点下降到最低点（mViewHeight / 2 - mJumpHeight——>mViewHeight / 2 + mDownPx） 137 | //这里我们实时获取到mY(小球圆心Y坐标)，根据mY的值判断何时接触绳子，接触绳子之后开始给控制点mBerSaiErY赋值，重新绘制贝塞尔曲线。 138 | mAnimatorDown = ValueAnimator.ofFloat(mViewHeight / 2 - mJumpHeight, mViewHeight / 2 + mDownPx); 139 | mAnimatorDown.setDuration(TIME); 140 | mAnimatorDown.setInterpolator(new AccelerateInterpolator());//加速下降 141 | mAnimatorDown.addUpdateListener(new ValueAnimator.AnimatorUpdateListener() { 142 | @Override 143 | public void onAnimationUpdate(ValueAnimator valueAnimator) { 144 | mY = (float) valueAnimator.getAnimatedValue(); 145 | if (mY < mViewHeight / 2 - mPointRadius - mPaintWidth / 2) {//小球下降，没有接触绳子 146 | mBerSaiErY = mViewHeight / 2;//在这个过程中绳子没有发生变化 147 | } else if (mY >= mViewHeight / 2 - mPointRadius - mPaintWidth / 2 && mY <= mViewHeight / 2 + mDownPx) { 148 | //在这个过程中，绳子贴着小球一块下降到最低点。 149 | mBerSaiErY = getControlPointF(start, end, 150 | new Point(mViewWidth / 2, mY + mPointRadius + mPaintWidth / 2)).getY(); 151 | } 152 | invalidate();//重新绘制 153 | 154 | } 155 | }); 156 | mAnimatorDown.addListener(new AnimatorListenerAdapter() { 157 | @Override 158 | public void onAnimationEnd(Animator animation) { 159 | super.onAnimationEnd(animation); 160 | up();//当下降完成后开始上升 161 | } 162 | }); 163 | //(弹起过程部分) 164 | //功能：球从最低处弹起到最高处 165 | //这个过程中需要考虑两个部分，第一部分是小球一直在上升，第二部分是绳子的回弹效果。 166 | //小球：小球的上升很好理解，直接从最低点到最高点减速上升 167 | //绳子：小球上升到距离水平面一定距离后（这里默认和绳子下降的最低距离相同），小球和绳子分离，小球继续上升，绳子开始回弹。 168 | //绳子的回弹过程，从最低点弹起——>水平面（绳子水平是的位置）——>上升到球线分离——>水平面（绳子水平是的位置）——>最低点一半的距离——>水平面（绳子水平是的位置） 169 | mAnimatorUp = ValueAnimator.ofFloat(mViewHeight / 2 + mDownPx, mViewHeight / 2 - mJumpHeight); 170 | mAnimatorUp.setInterpolator(new DecelerateInterpolator());//减速上升 171 | mAnimatorUp.setDuration(TIME); 172 | mAnimatorUp.addUpdateListener(new ValueAnimator.AnimatorUpdateListener() { 173 | @Override 174 | public void onAnimationUpdate(ValueAnimator valueAnimator) { 175 | mY = (float) valueAnimator.getAnimatedValue(); 176 | if (mY >= mViewHeight / 2 - mDownPx - mPointRadius - mPaintWidth / 2 177 | && mY <= mViewHeight / 2 + mDownPx) {//上升100个像素后球线分离 178 | mBerSaiErY = getControlPointF(start, end, 179 | new Point(mViewWidth / 2, mY + mPointRadius + mPaintWidth / 2)).getY(); 180 | } else if (mY >= mViewHeight / 2 - mDownPx - (mDownPx + mDownPx / 2) - mPointRadius - mPaintWidth / 2 181 | && mY < mViewHeight / 2 - mDownPx - mPointRadius - mPaintWidth / 2) {//线下降150个像素 182 | //获取曲线上的中心点坐标 183 | float mCenterY = (mViewHeight / 2 - mDownPx - mPointRadius - mPaintWidth / 2) * 2 - mY; 184 | //根据中心点坐标获取曲线的控制点坐标Y 185 | mBerSaiErY = getControlPointF(start, end, new Point(mViewWidth / 2, mCenterY + mPointRadius + mPaintWidth / 2)).getY(); 186 | 187 | } else if (mY >= mViewHeight / 2 - mDownPx - (mDownPx + mDownPx / 2) - mDownPx / 2 - mPointRadius - mPaintWidth / 2 188 | && mY < mViewHeight / 2 - mDownPx - (mDownPx + mDownPx / 2) - mPointRadius - mPaintWidth / 2) {//线上升50个像素 189 | //获取曲线上的中心点坐标 190 | float mCenterY = mY + 3 * mDownPx; 191 | //根据中心点坐标获取曲线的控制点坐标Y 192 | mBerSaiErY = getControlPointF(start, end, new Point(mViewWidth / 2, mCenterY + mPointRadius + mPaintWidth / 2)).getY(); 193 | } else {//线静止 194 | mBerSaiErY = mViewHeight / 2; 195 | } 196 | invalidate();//重新绘制 197 | 198 | } 199 | }); 200 | mAnimatorUp.addListener(new AnimatorListenerAdapter() { 201 | @Override 202 | public void onAnimationEnd(Animator animation) { 203 | super.onAnimationEnd(animation); 204 | Startdown();//当上升完成后开始下降 205 | } 206 | }); 207 | 208 | } 209 | 210 | /** 211 | * 开启下降动画 212 | */ 213 | public void Startdown() { 214 | mAnimatorDown.start(); 215 | } 216 | 217 | /** 218 | * 开启上升动画 219 | */ 220 | private void up() { 221 | mAnimatorUp.start(); 222 | } 223 | 224 | /** 225 | * 根据 最高点，获取贝塞尔曲线的 控制点 226 | * 227 | * @param startPointF 开始点 228 | * @param endPointF 结束点 229 | * @param bezierPointF 最高点 230 | * @return 控制点 231 | */ 232 | public static Point getControlPointF(Point startPointF, Point endPointF, Point bezierPointF) { 233 | //B(t)=(1-t)^2P0+2t(1-t)P1+t^2P2; 234 | Point controlPointF = new Point(0, 0); 235 | float tmp = 0.5F; 236 | float t = 0.5F; 237 | controlPointF.setX((bezierPointF.getX() - tmp * tmp * startPointF.getY() - t * t * endPointF.getY()) / (2 * t * tmp)); 238 | controlPointF.setY((bezierPointF.getY() - tmp * tmp * startPointF.getY() - t * t * endPointF.getY()) / (2 * t * tmp)); 239 | return controlPointF; 240 | } 241 | 242 | } 243 | --------------------------------------------------------------------------------