├── app
├── .gitignore
├── src
│ ├── main
│ │ ├── res
│ │ │ ├── values
│ │ │ │ ├── strings.xml
│ │ │ │ ├── colors.xml
│ │ │ │ ├── dimens.xml
│ │ │ │ └── styles.xml
│ │ │ ├── mipmap-hdpi
│ │ │ │ └── ic_launcher.png
│ │ │ ├── mipmap-mdpi
│ │ │ │ └── ic_launcher.png
│ │ │ ├── mipmap-xhdpi
│ │ │ │ └── ic_launcher.png
│ │ │ ├── mipmap-xxhdpi
│ │ │ │ └── ic_launcher.png
│ │ │ ├── mipmap-xxxhdpi
│ │ │ │ └── ic_launcher.png
│ │ │ ├── values-w820dp
│ │ │ │ └── dimens.xml
│ │ │ └── layout
│ │ │ │ └── activity_main.xml
│ │ ├── AndroidManifest.xml
│ │ └── java
│ │ │ └── org
│ │ │ └── wangchenlong
│ │ │ └── contentproviderdemo
│ │ │ ├── Book.java
│ │ │ ├── DbOpenHelper.java
│ │ │ ├── User.java
│ │ │ ├── MainActivity.java
│ │ │ └── BookProvider.java
│ ├── test
│ │ └── java
│ │ │ └── org
│ │ │ └── wangchenlong
│ │ │ └── contentproviderdemo
│ │ │ └── ExampleUnitTest.java
│ └── androidTest
│ │ └── java
│ │ └── org
│ │ └── wangchenlong
│ │ └── contentproviderdemo
│ │ └── ApplicationTest.java
├── build.gradle
└── proguard-rules.pro
├── .idea
├── .name
├── copyright
│ └── profiles_settings.xml
├── encodings.xml
├── vcs.xml
├── modules.xml
├── runConfigurations.xml
├── compiler.xml
├── gradle.xml
└── misc.xml
├── settings.gradle
├── articles
└── demo-anim.gif
├── gradle
└── wrapper
│ ├── gradle-wrapper.jar
│ └── gradle-wrapper.properties
├── .gitignore
├── gradle.properties
├── gradlew.bat
├── gradlew
└── README.md
/app/.gitignore:
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1 | /build
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/.idea/.name:
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1 | ContentProviderDemo
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/settings.gradle:
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1 | include ':app'
2 |
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/articles/demo-anim.gif:
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https://raw.githubusercontent.com/SpikeKing/ContentProviderDemo/HEAD/articles/demo-anim.gif
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/.idea/copyright/profiles_settings.xml:
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/app/src/main/res/values/strings.xml:
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/gradle/wrapper/gradle-wrapper.jar:
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https://raw.githubusercontent.com/SpikeKing/ContentProviderDemo/HEAD/gradle/wrapper/gradle-wrapper.jar
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/.gitignore:
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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 |
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/app/src/main/res/mipmap-hdpi/ic_launcher.png:
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https://raw.githubusercontent.com/SpikeKing/ContentProviderDemo/HEAD/app/src/main/res/mipmap-hdpi/ic_launcher.png
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/app/src/main/res/mipmap-mdpi/ic_launcher.png:
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https://raw.githubusercontent.com/SpikeKing/ContentProviderDemo/HEAD/app/src/main/res/mipmap-mdpi/ic_launcher.png
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/app/src/main/res/mipmap-xhdpi/ic_launcher.png:
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https://raw.githubusercontent.com/SpikeKing/ContentProviderDemo/HEAD/app/src/main/res/mipmap-xhdpi/ic_launcher.png
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/app/src/main/res/mipmap-xxhdpi/ic_launcher.png:
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https://raw.githubusercontent.com/SpikeKing/ContentProviderDemo/HEAD/app/src/main/res/mipmap-xxhdpi/ic_launcher.png
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/app/src/main/res/mipmap-xxxhdpi/ic_launcher.png:
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/.idea/encodings.xml:
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/.idea/vcs.xml:
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/app/src/main/res/values/colors.xml:
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4 | #303F9F
5 | #FF4081
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/app/src/main/res/values/dimens.xml:
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3 | 16dp
4 | 16dp
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/gradle/wrapper/gradle-wrapper.properties:
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1 | #Mon Dec 28 10:00:20 PST 2015
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-2.10-all.zip
7 |
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/app/src/main/res/values-w820dp/dimens.xml:
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5 | 64dp
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/app/src/test/java/org/wangchenlong/contentproviderdemo/ExampleUnitTest.java:
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1 | package org.wangchenlong.contentproviderdemo;
2 |
3 | import org.junit.Test;
4 |
5 | import static org.junit.Assert.*;
6 |
7 | /**
8 | * To work on unit tests, switch the Test Artifact in the Build Variants view.
9 | */
10 | public class ExampleUnitTest {
11 | @Test
12 | public void addition_isCorrect() throws Exception {
13 | assertEquals(4, 2 + 2);
14 | }
15 | }
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/app/src/androidTest/java/org/wangchenlong/contentproviderdemo/ApplicationTest.java:
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1 | package org.wangchenlong.contentproviderdemo;
2 |
3 | import android.app.Application;
4 | import android.test.ApplicationTestCase;
5 |
6 | /**
7 | * Testing Fundamentals
8 | */
9 | public class ApplicationTest extends ApplicationTestCase {
10 | public ApplicationTest() {
11 | super(Application.class);
12 | }
13 | }
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/.idea/runConfigurations.xml:
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/app/build.gradle:
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1 | apply plugin: 'com.android.application'
2 |
3 | android {
4 | compileSdkVersion 23
5 | buildToolsVersion "23.0.2"
6 |
7 | defaultConfig {
8 | applicationId "org.wangchenlong.contentproviderdemo"
9 | minSdkVersion 16
10 | targetSdkVersion 23
11 | versionCode 1
12 | versionName "1.0"
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 | testCompile 'junit:junit:4.12'
25 | compile 'com.android.support:appcompat-v7:23.3.0'
26 | }
27 |
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/app/proguard-rules.pro:
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1 | # Add project specific ProGuard rules here.
2 | # By default, the flags in this file are appended to flags specified
3 | # in /Users/wangchenlong/Installations/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 |
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/.idea/gradle.xml:
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2 |
3 |
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23 |
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/gradle.properties:
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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 | # Default value: -Xmx10248m -XX:MaxPermSize=256m
13 | # org.gradle.jvmargs=-Xmx2048m -XX:MaxPermSize=512m -XX:+HeapDumpOnOutOfMemoryError -Dfile.encoding=UTF-8
14 |
15 | # When configured, Gradle will run in incubating parallel mode.
16 | # This option should only be used with decoupled projects. More details, visit
17 | # http://www.gradle.org/docs/current/userguide/multi_project_builds.html#sec:decoupled_projects
18 | # org.gradle.parallel=true
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/app/src/main/AndroidManifest.xml:
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/app/src/main/java/org/wangchenlong/contentproviderdemo/Book.java:
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1 | package org.wangchenlong.contentproviderdemo;
2 |
3 | import android.os.Parcel;
4 | import android.os.Parcelable;
5 |
6 | public class Book implements Parcelable {
7 |
8 | public int bookId;
9 | public String bookName;
10 |
11 | public Book() {
12 |
13 | }
14 |
15 | public Book(int bookId, String bookName) {
16 | this.bookId = bookId;
17 | this.bookName = bookName;
18 | }
19 |
20 | public int describeContents() {
21 | return 0;
22 | }
23 |
24 | public void writeToParcel(Parcel out, int flags) {
25 | out.writeInt(bookId);
26 | out.writeString(bookName);
27 | }
28 |
29 | public static final Creator CREATOR = new Creator() {
30 | public Book createFromParcel(Parcel in) {
31 | return new Book(in);
32 | }
33 |
34 | public Book[] newArray(int size) {
35 | return new Book[size];
36 | }
37 | };
38 |
39 | private Book(Parcel in) {
40 | bookId = in.readInt();
41 | bookName = in.readString();
42 | }
43 |
44 | @Override
45 | public String toString() {
46 | return String.format("[bookId:%s, bookName:%s]", bookId, bookName);
47 | }
48 |
49 | }
50 |
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/app/src/main/java/org/wangchenlong/contentproviderdemo/DbOpenHelper.java:
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1 | package org.wangchenlong.contentproviderdemo;
2 |
3 | import android.content.Context;
4 | import android.database.sqlite.SQLiteDatabase;
5 | import android.database.sqlite.SQLiteOpenHelper;
6 |
7 | /**
8 | * 书籍的数据库
9 | *
10 | * Created by wangchenlong on 16/6/14.
11 | */
12 | public class DbOpenHelper extends SQLiteOpenHelper {
13 | private static final String DB_NAME = "book_provider.db";
14 | public static final String BOOK_TABLE_NAME = "book";
15 | public static final String USER_TABLE_NAME = "user";
16 |
17 | private static final int DB_VERSION = 1;
18 |
19 | private String CREATE_BOOK_TABLE = "CREATE TABLE IF NOT EXISTS "
20 | + BOOK_TABLE_NAME + "(_id INTEGER PRIMARY KEY, name TEXT)";
21 |
22 | private String CREATE_USER_TABLE = "CREATE TABLE IF NOT EXISTS "
23 | + USER_TABLE_NAME + "(_id INTEGER PRIMARY KEY, name TEXT, sex INT)";
24 |
25 | public DbOpenHelper(Context context) {
26 | super(context, DB_NAME, null, DB_VERSION);
27 | }
28 |
29 | @Override public void onCreate(SQLiteDatabase db) {
30 | db.execSQL(CREATE_BOOK_TABLE);
31 | db.execSQL(CREATE_USER_TABLE);
32 | }
33 |
34 | @Override public void onUpgrade(SQLiteDatabase db, int oldVersion, int newVersion) {
35 |
36 | }
37 | }
38 |
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/app/src/main/java/org/wangchenlong/contentproviderdemo/User.java:
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1 | package org.wangchenlong.contentproviderdemo;
2 |
3 | import android.os.Parcel;
4 | import android.os.Parcelable;
5 |
6 | import java.io.Serializable;
7 |
8 | public class User implements Parcelable {
9 | public int userId;
10 | public String userName;
11 | public boolean isMale;
12 | public Book book;
13 |
14 | public User() {
15 | }
16 |
17 | public User(int userId, String userName, boolean isMale) {
18 | this.userId = userId;
19 | this.userName = userName;
20 | this.isMale = isMale;
21 | }
22 |
23 | public int describeContents() {
24 | return 0;
25 | }
26 |
27 | public void writeToParcel(Parcel out, int flags) {
28 | out.writeInt(userId);
29 | out.writeString(userName);
30 | out.writeInt(isMale ? 1 : 0);
31 | out.writeParcelable(book, 0);
32 | }
33 |
34 | public static final Creator CREATOR = new Creator() {
35 | public User createFromParcel(Parcel in) {
36 | return new User(in);
37 | }
38 |
39 | public User[] newArray(int size) {
40 | return new User[size];
41 | }
42 | };
43 |
44 | private User(Parcel in) {
45 | userId = in.readInt();
46 | userName = in.readString();
47 | isMale = in.readInt() == 1;
48 | book = in
49 | .readParcelable(Thread.currentThread().getContextClassLoader());
50 | }
51 |
52 | @Override
53 | public String toString() {
54 | return String.format(
55 | "[userId:%s, userName:%s, isMale:%s, book:{%s}]",
56 | userId, userName, isMale, book);
57 | }
58 |
59 | }
60 |
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/app/src/main/res/layout/activity_main.xml:
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/gradlew.bat:
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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 |
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/app/src/main/java/org/wangchenlong/contentproviderdemo/MainActivity.java:
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1 | package org.wangchenlong.contentproviderdemo;
2 |
3 | import android.content.ContentValues;
4 | import android.database.Cursor;
5 | import android.net.Uri;
6 | import android.support.v7.app.AppCompatActivity;
7 | import android.os.Bundle;
8 | import android.util.Log;
9 | import android.view.View;
10 | import android.widget.TextView;
11 |
12 | public class MainActivity extends AppCompatActivity {
13 |
14 | private static final String TAG = "DEBUG-WCL: " + MainActivity.class.getSimpleName();
15 |
16 | private TextView mTvShowBooks; // 显示书籍
17 | private TextView mTvShowUsers; // 显示用户
18 |
19 | @Override
20 | protected void onCreate(Bundle savedInstanceState) {
21 |
22 | super.onCreate(savedInstanceState);
23 | setContentView(R.layout.activity_main);
24 |
25 | mTvShowBooks = (TextView) findViewById(R.id.main_tv_show_books);
26 | mTvShowUsers = (TextView) findViewById(R.id.main_tv_show_users);
27 | }
28 |
29 | /**
30 | * 添加书籍的事件监听
31 | *
32 | * @param view 视图
33 | */
34 | public void addBooks(View view) {
35 | Uri bookUri = BookProvider.BOOK_CONTENT_URI;
36 | ContentValues values = new ContentValues();
37 | values.put("_id", 6);
38 | values.put("name", "信仰上帝");
39 | getContentResolver().insert(bookUri, values);
40 | }
41 |
42 | /**
43 | * 显示书籍
44 | *
45 | * @param view 视图
46 | */
47 | public void showBooks(View view) {
48 | String content = "";
49 | Uri bookUri = BookProvider.BOOK_CONTENT_URI;
50 | Cursor bookCursor = getContentResolver().query(bookUri, new String[]{"_id", "name"}, null, null, null);
51 | if (bookCursor != null) {
52 | while (bookCursor.moveToNext()) {
53 | Book book = new Book();
54 | book.bookId = bookCursor.getInt(0);
55 | book.bookName = bookCursor.getString(1);
56 | content += book.toString() + "\n";
57 | Log.e(TAG, "query book: " + book.toString());
58 | mTvShowBooks.setText(content);
59 | }
60 | bookCursor.close();
61 | }
62 | }
63 |
64 | /**
65 | * 显示用户
66 | *
67 | * @param view 视图
68 | */
69 | public void showUsers(View view) {
70 | String content = "";
71 | Uri userUri = BookProvider.USER_CONTENT_URI;
72 | Cursor userCursor = getContentResolver().query(userUri, new String[]{"_id", "name", "sex"}, null, null, null);
73 | if (userCursor != null) {
74 | while (userCursor.moveToNext()) {
75 | User user = new User();
76 | user.userId = userCursor.getInt(0);
77 | user.userName = userCursor.getString(1);
78 | user.isMale = userCursor.getInt(2) == 1;
79 | content += user.toString() + "\n";
80 | Log.e(TAG, "query user:" + user.toString());
81 | mTvShowUsers.setText(content);
82 | }
83 | userCursor.close();
84 | }
85 | }
86 | }
87 |
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42 |
43 |
44 |
45 | Android
46 |
47 |
48 | Android Lint
49 |
50 |
51 | Java
52 |
53 |
54 | Java language level migration aidsJava
55 |
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77 | $USER_HOME$/.subversion
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/app/src/main/java/org/wangchenlong/contentproviderdemo/BookProvider.java:
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1 | package org.wangchenlong.contentproviderdemo;
2 |
3 | import android.content.ContentProvider;
4 | import android.content.ContentValues;
5 | import android.content.Context;
6 | import android.content.UriMatcher;
7 | import android.database.Cursor;
8 | import android.database.sqlite.SQLiteDatabase;
9 | import android.net.Uri;
10 | import android.support.annotation.Nullable;
11 | import android.text.TextUtils;
12 | import android.util.Log;
13 |
14 | /**
15 | * 书籍提供者
16 | *
17 | * Created by wangchenlong on 16/6/14.
18 | */
19 | public class BookProvider extends ContentProvider {
20 |
21 | private static final String TAG = "DEBUG-WCL: " + BookProvider.class.getSimpleName();
22 |
23 | public static final String AUTHORITY = "org.wangchenlong.book.provider"; // 与AndroidManifest保持一致
24 | public static final Uri BOOK_CONTENT_URI = Uri.parse("content://" + AUTHORITY + "/book");
25 | public static final Uri USER_CONTENT_URI = Uri.parse("content://" + AUTHORITY + "/user");
26 |
27 | public static final int BOOK_URI_CODE = 0;
28 | public static final int USER_URI_CODE = 1;
29 |
30 | private static final UriMatcher sUriMatcher = new UriMatcher(UriMatcher.NO_MATCH);
31 |
32 | // 关联Uri和Uri_Code
33 | static {
34 | sUriMatcher.addURI(AUTHORITY, "book", BOOK_URI_CODE);
35 | sUriMatcher.addURI(AUTHORITY, "user", USER_URI_CODE);
36 | }
37 |
38 | private Context mContext;
39 | private SQLiteDatabase mDb;
40 |
41 | @Override public boolean onCreate() {
42 | showLogs("onCreate 当前线程: " + Thread.currentThread().getName());
43 | mContext = getContext();
44 |
45 | initProviderData(); // 初始化Provider数据
46 |
47 | return false;
48 | }
49 |
50 | private void initProviderData() {
51 | mDb = new DbOpenHelper(mContext).getWritableDatabase();
52 | mDb.execSQL("delete from " + DbOpenHelper.BOOK_TABLE_NAME);
53 | mDb.execSQL("delete from " + DbOpenHelper.USER_TABLE_NAME);
54 | mDb.execSQL("insert into book values(3,'Android');");
55 | mDb.execSQL("insert into book values(4, 'iOS');");
56 | mDb.execSQL("insert into book values(5, 'HTML5');");
57 | mDb.execSQL("insert into user values(1, 'Spike', 1);");
58 | mDb.execSQL("insert into user values(2, 'Wang', 0);");
59 | }
60 |
61 | @Nullable @Override
62 | public Cursor query(Uri uri, String[] projection, String selection, String[] selectionArgs, String sortOrder) {
63 | showLogs("query 当前线程: " + Thread.currentThread().getName());
64 | String tableName = getTableName(uri);
65 | if (TextUtils.isEmpty(tableName)) {
66 | throw new IllegalArgumentException("Unsupported URI: " + uri);
67 | }
68 | return mDb.query(tableName, projection, selection, selectionArgs, null, null, sortOrder, null);
69 | }
70 |
71 | @Nullable @Override public String getType(Uri uri) {
72 | showLogs("getType");
73 | return null;
74 | }
75 |
76 | @Nullable @Override public Uri insert(Uri uri, ContentValues values) {
77 | showLogs("insert");
78 | String table = getTableName(uri);
79 | if (TextUtils.isEmpty(table)) {
80 | throw new IllegalArgumentException("Unsupported URI: " + uri);
81 | }
82 | mDb.insert(table, null, values);
83 |
84 | // 插入数据后通知改变
85 | mContext.getContentResolver().notifyChange(uri, null);
86 | return null;
87 | }
88 |
89 | @Override public int delete(Uri uri, String selection, String[] selectionArgs) {
90 | showLogs("delete");
91 |
92 | String table = getTableName(uri);
93 | if (TextUtils.isEmpty(table)) {
94 | throw new IllegalArgumentException("Unsupported URI: " + uri);
95 | }
96 | int count = mDb.delete(table, selection, selectionArgs);
97 | if (count > 0) {
98 | mContext.getContentResolver().notifyChange(uri, null);
99 | }
100 |
101 | return count; // 返回删除的函数
102 | }
103 |
104 | @Override
105 | public int update(Uri uri, ContentValues values, String selection, String[] selectionArgs) {
106 | showLogs("update");
107 |
108 | String table = getTableName(uri);
109 | if (TextUtils.isEmpty(table)) {
110 | throw new IllegalArgumentException("Unsupported URI: " + uri);
111 | }
112 | int row = mDb.update(table, values, selection, selectionArgs);
113 | if (row > 0) {
114 | mContext.getContentResolver().notifyChange(uri, null);
115 | }
116 |
117 | return row; // 返回更新的行数
118 | }
119 |
120 | private String getTableName(Uri uri) {
121 | String tableName = null;
122 | switch (sUriMatcher.match(uri)) {
123 | case BOOK_URI_CODE:
124 | tableName = DbOpenHelper.BOOK_TABLE_NAME;
125 | break;
126 | case USER_URI_CODE:
127 | tableName = DbOpenHelper.USER_TABLE_NAME;
128 | break;
129 | default:
130 | break;
131 | }
132 | return tableName;
133 | }
134 |
135 | private void showLogs(String msg) {
136 | Log.e(TAG, msg);
137 | }
138 | }
139 |
--------------------------------------------------------------------------------
/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 |
--------------------------------------------------------------------------------
/README.md:
--------------------------------------------------------------------------------
1 | # 使用 ContentProvider 跨进程共享数据
2 |
3 | > 欢迎Follow我的[GitHub](https://github.com/SpikeKing)
4 |
5 | **ContentProvider**主要应用于进程间数据共享. 对于应用而言, 多进程并不会经常使用, 因而较少使用ContentProvider, 是最不常见的四大组件(Activity, Service, BroadcastReceiver, ContentProvider). 但是其优异的性能与便捷, 对于多应用共享数据而言, 非常重要, 比如共享同一份计步数据等. 开发者只有掌握多种技能, 才能在开发中游刃有余, 用最优的方式完成项目, 提升应用性能, 间接提高用户体验. 本文借用Demo, 讲解ContentProvider共享数据的要点.
6 |
7 | 本文源码的GitHub[下载地址](https://github.com/SpikeKing/ContentProviderDemo)
8 |
9 | ---
10 |
11 | ## SQLite
12 |
13 | ContentProvider需要媒介进行数据存储, 最常用的就是SQLite数据库.
14 |
15 | SQLite数据库继承``SQLiteOpenHelper``类, 提供数据库名称, 表名, 版本. 在onCreate方法中, 创建数据库表, 添加字段.
16 |
17 | 本示例使用两张表, 书籍和用户.
18 |
19 | ``` java
20 | public class DbOpenHelper extends SQLiteOpenHelper {
21 | private static final String DB_NAME = "book_provider.db";
22 | public static final String BOOK_TABLE_NAME = "book";
23 | public static final String USER_TABLE_NAME = "user";
24 |
25 | private static final int DB_VERSION = 1;
26 |
27 | private String CREATE_BOOK_TABLE = "CREATE TABLE IF NOT EXISTS "
28 | + BOOK_TABLE_NAME + "(_id INTEGER PRIMARY KEY, name TEXT)";
29 |
30 | private String CREATE_USER_TABLE = "CREATE TABLE IF NOT EXISTS "
31 | + USER_TABLE_NAME + "(_id INTEGER PRIMARY KEY, name TEXT, sex INT)";
32 |
33 | public DbOpenHelper(Context context) {
34 | super(context, DB_NAME, null, DB_VERSION);
35 | }
36 |
37 | @Override public void onCreate(SQLiteDatabase db) {
38 | db.execSQL(CREATE_BOOK_TABLE);
39 | db.execSQL(CREATE_USER_TABLE);
40 | }
41 |
42 | @Override public void onUpgrade(SQLiteDatabase db, int oldVersion, int newVersion) {
43 |
44 | }
45 | }
46 | ```
47 |
48 | > 直接使用数据库的情况较少, 也比较复杂, 推荐使用一些经典ORM数据库, 如[Sugar](https://github.com/satyan/sugar)等, 简化管理. ORM, 即对象关系映射.
49 |
50 | ---
51 |
52 | ## ContentProvider
53 |
54 | ContentProvider提供数据访问的接口, CRUD增删改查. 在onCreate中, 初始化数据库, 并添加数据.
55 |
56 | ``` java
57 | @Override public boolean onCreate() {
58 | showLogs("onCreate 当前线程: " + Thread.currentThread().getName());
59 | mContext = getContext();
60 |
61 | initProviderData(); // 初始化Provider数据
62 |
63 | return false;
64 | }
65 |
66 | private void initProviderData() {
67 | mDb = new DbOpenHelper(mContext).getWritableDatabase();
68 | mDb.execSQL("delete from " + DbOpenHelper.BOOK_TABLE_NAME);
69 | mDb.execSQL("delete from " + DbOpenHelper.USER_TABLE_NAME);
70 | mDb.execSQL("insert into book values(3,'Android');");
71 | mDb.execSQL("insert into book values(4, 'iOS');");
72 | mDb.execSQL("insert into book values(5, 'HTML5');");
73 | mDb.execSQL("insert into user values(1, 'Spike', 1);");
74 | mDb.execSQL("insert into user values(2, 'Wang', 0);");
75 | }
76 | ```
77 |
78 | CRUD的参数是Uri, 数据库需要使用表名, 为了便于从Uri映射到表名, 使用关系转换.
79 |
80 | ``` java
81 | private String getTableName(Uri uri) {
82 | String tableName = null;
83 | switch (sUriMatcher.match(uri)) {
84 | case BOOK_URI_CODE:
85 | tableName = DbOpenHelper.BOOK_TABLE_NAME;
86 | break;
87 | case USER_URI_CODE:
88 | tableName = DbOpenHelper.USER_TABLE_NAME;
89 | break;
90 | default:
91 | break;
92 | }
93 | return tableName;
94 | }
95 | ```
96 |
97 | 添加数据``insert``, 可以注册内容改变的监听, 插入数据时, 广播更新, 即``notifyChange``.
98 |
99 | ``` java
100 | @Nullable @Override public Uri insert(Uri uri, ContentValues values) {
101 | showLogs("insert");
102 | String table = getTableName(uri);
103 | if (TextUtils.isEmpty(table)) {
104 | throw new IllegalArgumentException("Unsupported URI: " + uri);
105 | }
106 | mDb.insert(table, null, values);
107 |
108 | // 插入数据后通知改变
109 | mContext.getContentResolver().notifyChange(uri, null);
110 | return null;
111 | }
112 | ```
113 |
114 | 删除数据``delete``, 返回删除数据的数量, 大于0即删除成功.
115 |
116 | ``` java
117 | @Override public int delete(Uri uri, String selection, String[] selectionArgs) {
118 | showLogs("delete");
119 |
120 | String table = getTableName(uri);
121 | if (TextUtils.isEmpty(table)) {
122 | throw new IllegalArgumentException("Unsupported URI: " + uri);
123 | }
124 | int count = mDb.delete(table, selection, selectionArgs);
125 | if (count > 0) {
126 | mContext.getContentResolver().notifyChange(uri, null);
127 | }
128 |
129 | return count; // 返回删除的函数
130 | }
131 | ```
132 |
133 | 修改数据``update``, 与删除类似, 返回修改数据的数量.
134 |
135 | ``` java
136 | @Override
137 | public int update(Uri uri, ContentValues values, String selection, String[] selectionArgs) {
138 | showLogs("update");
139 |
140 | String table = getTableName(uri);
141 | if (TextUtils.isEmpty(table)) {
142 | throw new IllegalArgumentException("Unsupported URI: " + uri);
143 | }
144 | int row = mDb.update(table, values, selection, selectionArgs);
145 | if (row > 0) {
146 | mContext.getContentResolver().notifyChange(uri, null);
147 | }
148 |
149 | return row; // 返回更新的行数
150 | }
151 | ```
152 |
153 | 查询数据``query``, 返回数据库的游标, 处理数据.
154 |
155 | ``` java
156 | @Nullable @Override
157 | public Cursor query(Uri uri, String[] projection, String selection, String[] selectionArgs, String sortOrder) {
158 | showLogs("query 当前线程: " + Thread.currentThread().getName());
159 | String tableName = getTableName(uri);
160 | if (TextUtils.isEmpty(tableName)) {
161 | throw new IllegalArgumentException("Unsupported URI: " + uri);
162 | }
163 | return mDb.query(tableName, projection, selection, selectionArgs, null, null, sortOrder, null);
164 | }
165 | ```
166 |
167 | > 注意Uri和表名的转换可能为空, 使用``TextUtils.isEmpty``判空.
168 |
169 | ---
170 |
171 | ## 共享数据
172 |
173 | 使用ContentProvider的独立进程, 模拟进程间共享数据.
174 |
175 | ``` xml
176 |
181 | ```
182 |
183 | > 在AndroidManifest中, 把Provider注册在``:provider``进程中, 与主进程分离.
184 |
185 | 添加数据, 通过Uri找到ContentProvider, 使用``ContentResolver``的``insert``方法, 添加``ContentValues``数据.
186 |
187 | ``` java
188 | public void addBooks(View view) {
189 | Uri bookUri = BookProvider.BOOK_CONTENT_URI;
190 | ContentValues values = new ContentValues();
191 | values.put("_id", 6);
192 | values.put("name", "信仰上帝");
193 | getContentResolver().insert(bookUri, values);
194 | }
195 | ```
196 |
197 | 查询数据``query``, 与数据库的使用方式类似, 解析出Cursor, 通过移动Cursor, 找到所有匹配的结果.
198 |
199 | ``` java
200 | public void showBooks(View view) {
201 | String content = "";
202 | Uri bookUri = BookProvider.BOOK_CONTENT_URI;
203 | Cursor bookCursor = getContentResolver().query(bookUri, new String[]{"_id", "name"}, null, null, null);
204 | if (bookCursor != null) {
205 | while (bookCursor.moveToNext()) {
206 | Book book = new Book();
207 | book.bookId = bookCursor.getInt(0);
208 | book.bookName = bookCursor.getString(1);
209 | content += book.toString() + "\n";
210 | Log.e(TAG, "query book: " + book.toString());
211 | mTvShowBooks.setText(content);
212 | }
213 | bookCursor.close();
214 | }
215 | }
216 | ```
217 |
218 | ---
219 |
220 | 效果
221 |
222 | 
223 |
224 | ContentProvider封装了跨进程共享的逻辑, 我们只需要Uri即可访问数据, 使用共享数据非常便捷, 需要掌握简单的使用方式.
225 |
226 | OK, that's all! Enjoy it!
227 |
--------------------------------------------------------------------------------