Mars Chen Android培训材料ContentProvider源代码

来源：互联网发布：java软件接口编辑：程序博客网时间：2024/05/01 12:21

个人总结：

（1）视频中 AUTHORITY有问题，正确的应该为：

public static final String AUTHORITY ="com.example.testcontentprovider.FirstContentProvider";

1. AndroidManifest.xml

<?xml version="1.0" encoding="utf-8"?>

<manifest xmlns:android="http://schemas.android.com/apk/res/android"

package="com.example.testcontentprovider"

android:versionCode="1"

android:versionName="1.0" >

<uses-sdk

android:minSdkVersion="8"

android:targetSdkVersion="18" />

<application

android:allowBackup="true"

android:icon="@drawable/ic_launcher"

android:label="@string/app_name"

android:theme="@style/AppTheme" >

<activity

android:name="com.example.testcontentprovider.MainActivity"

android:label="@string/app_name" >

<intent-filter>

</intent-filter>

</activity>

<provider android:name="com.example.testcontentprovider.FirstContentProvider"

android:authorities="com.example.testcontentprovider.FirstContentProvider"></provider>

</application>

</manifest>

2. activity_main.xml

<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"

android:layout_width="fill_parent"

android:layout_height="fill_parent"

android:orientation="vertical">

<TextView

android:id="@+id/result"

android:layout_width="wrap_content"

android:layout_height="wrap_content"

android:text="Main activity of Content Provider" />

<Button

android:id="@+id/insert"

android:layout_width="fill_parent"

android:layout_height="wrap_content"

android:text="Insert"

<Button

android:id="@+id/query"

android:layout_width="fill_parent"

android:layout_height="wrap_content"

android:text="Query"

</LinearLayout>

3. DatabaseHelper.java

package com.example.sqlite3;

import com.example.testcontentprovider.FirstProviderMetaData;

import android.content.Context;

import android.database.sqlite.SQLiteDatabase;

import android.database.sqlite.SQLiteDatabase.CursorFactory;

import android.database.sqlite.SQLiteOpenHelper;

public class DatabaseHelper extends SQLiteOpenHelper{

private static final int VERSION = 1;

public DatabaseHelper(Context context, String name){

this(context, name, VERSION);

}

public DatabaseHelper(Context context, String name, int version){

this(context, name, null, version);

}

public DatabaseHelper(Context context, String name, CursorFactory factory, int version){

super(context, name, factory, version);

}

/* (non-Javadoc)

* @see android.database.sqlite.SQLiteOpenHelper#onCreate(android.database.sqlite.SQLiteDatabase)

@Override

public void onCreate(SQLiteDatabase arg0) {

// TODO Auto-generated method stub

System.out.println("create a Database");

String strSql = "create table " + FirstProviderMetaData.USERS_TABLE_NAME

+"("+FirstProviderMetaData.UserTableMetaData._ID

+" INTEGER PRIMARY KEY AUTOINCREMENT,"

+ FirstProviderMetaData.UserTableMetaData.USER_NAME

+ " varchar(20))";

System.out.println(strSql);

arg0.execSQL(strSql);

}

/* (non-Javadoc)

* @see android.database.sqlite.SQLiteOpenHelper#onUpgrade(android.database.sqlite.SQLiteDatabase, int, int)

@Override

public void onUpgrade(SQLiteDatabase arg0, int arg1, int arg2) {

// TODO Auto-generated method stub

System.out.println("update a Database");

}

4. FirstContentProvider.java

package com.example.testcontentprovider;

import java.util.HashMap;

import android.content.ContentProvider;

import android.content.ContentUris;

import android.content.ContentValues;

import android.content.UriMatcher;

import android.database.Cursor;

import android.database.SQLException;

import android.database.sqlite.SQLiteDatabase;

import android.database.sqlite.SQLiteQueryBuilder;

import android.net.Uri;

import android.text.TextUtils;

import com.example.sqlite3.DatabaseHelper;

import com.example.testcontentprovider.FirstProviderMetaData.UserTableMetaData;

public class FirstContentProvider extends ContentProvider {

public static final UriMatcher uriMatcher;

public static final int INCOMING_USER_COLLECTION = 1;

public static final int INCOMING_USER_SINGLE = 2;

private DatabaseHelper dh;

static {

uriMatcher = new UriMatcher(UriMatcher.NO_MATCH);

uriMatcher.addURI(FirstProviderMetaData.AUTHORITY, "users", INCOMING_USER_COLLECTION);

uriMatcher.addURI(FirstProviderMetaData.AUTHORITY, "users/#", INCOMING_USER_SINGLE);

}

public static HashMap<String, String> userProjectionMap;

static {

userProjectionMap = new HashMap<String, String>();

userProjectionMap.put(UserTableMetaData._ID, UserTableMetaData._ID);

userProjectionMap.put(UserTableMetaData.USER_NAME, UserTableMetaData.USER_NAME);

}

/* (non-Javadoc)

* @see android.content.ContentProvider#delete(android.net.Uri, java.lang.String, java.lang.String[])

@Override

public int delete(Uri arg0, String arg1, String[] arg2) {

// TODO Auto-generated method stub

System.out.println("delete");

return 0;

}

/* (non-Javadoc)

* @see android.content.ContentProvider#getType(android.net.Uri)

@Override

public String getType(Uri arg0) {

// TODO Auto-generated method stub

System.out.println("getType");

switch (uriMatcher.match(arg0)) {

case INCOMING_USER_COLLECTION:

return UserTableMetaData.CONTENT_TYPE;

case INCOMING_USER_SINGLE:

return UserTableMetaData.CONTENT_TYPE_ITEM;

default:

throw new IllegalArgumentException("Unkown URI" + arg0);

}

/* (non-Javadoc)

* @see android.content.ContentProvider#insert(android.net.Uri, android.content.ContentValues)

@Override

public Uri insert(Uri arg0, ContentValues arg1) {

// TODO Auto-generated method stub

System.out.println("insert");

SQLiteDatabase db = dh.getWritableDatabase();

long rowId = db.insert(UserTableMetaData.TABLE_NAME, null, arg1);

if (rowId > 0) {

Uri insertedUserUri = ContentUris.withAppendedId(UserTableMetaData.CONTENT_URI, rowId);

getContext().getContentResolver().notifyChange(insertedUserUri, null);

return insertedUserUri;

}

throw new SQLException("Failed to insert row into" + arg0);

}

/* (non-Javadoc)

* @see android.content.ContentProvider#onCreate()

@Override

public boolean onCreate() {

// TODO Auto-generated method stub

dh = new DatabaseHelper(getContext(), FirstProviderMetaData.DATABASE_NAME);

System.out.println("onCreate");

return false;

}

/* (non-Javadoc)

* @see android.content.ContentProvider#query(android.net.Uri, java.lang.String[], java.lang.String, java.lang.String[], java.lang.String)

@Override

public Cursor query(Uri arg0, String[] arg1, String arg2, String[] arg3,

String arg4) {

// TODO Auto-generated method stub

SQLiteQueryBuilder qb = new SQLiteQueryBuilder();

switch (uriMatcher.match(arg0)) {

case INCOMING_USER_COLLECTION:

qb.setTables(UserTableMetaData.TABLE_NAME);

qb.setProjectionMap(userProjectionMap);

break;

case INCOMING_USER_SINGLE:

qb.setTables(UserTableMetaData.TABLE_NAME);

qb.setProjectionMap(userProjectionMap);

qb.appendWhere(UserTableMetaData._ID + "=" + arg0.getPathSegments().get(1));

break;

}

String orderBy;

if (TextUtils.isEmpty(arg4)) {

orderBy = UserTableMetaData.DEFAULT_SORT_ORDER;

}

else {

orderBy = arg4;

}

SQLiteDatabase db = dh.getWritableDatabase();

Cursor c = qb.query(db, arg1, arg2, arg3, null, null, orderBy);

c.setNotificationUri(getContext().getContentResolver(), arg0);

System.out.println("query");

return c;

}

/* (non-Javadoc)

* @see android.content.ContentProvider#update(android.net.Uri, android.content.ContentValues, java.lang.String, java.lang.String[])

@Override

public int update(Uri arg0, ContentValues arg1, String arg2, String[] arg3) {

// TODO Auto-generated method stub

System.out.println("update");

return 0;

}

5.FirstProviderMetaData.java

package com.example.testcontentprovider;

import android.net.Uri;

import android.provider.BaseColumns;

public class FirstProviderMetaData {

//final equals to static in C++

//相当于网站的域名,数据入口

public static final String AUTHORITY ="com.example.testcontentprovider.FirstContentProvider";

//数据库名称

public static final String DATABASE_NAME = "FirstProvider.db";

//数据库版本

public static final int DATABASE_VERSION = 1;

//表名

public static final String USERS_TABLE_NAME = "users";

//定义子表, content都统一成表组织的形式。他们之间可以相互嵌套

public static final class UserTableMetaData implements BaseColumns{

//表名

public static final String TABLE_NAME = "users";

//定义数据uri，该uri对应数据库中的users表

public static final Uri CONTENT_URI = Uri.parse("content://"+AUTHORITY+"/users");

//访问所有数据

public static final String CONTENT_TYPE = "vnd.android.cursor.dir/vnd.firstprovider.user";

//访问single数据项

public static final String CONTENT_TYPE_ITEM = "vnd.android.cursor.item/vnd.firstprovider.user";

//列名

public static final String USER_NAME = "name";

//默认排序方法

public static final String DEFAULT_SORT_ORDER = "_id desc";

}

6.MainActivity.java

package com.example.testcontentprovider;

//将SQLite封装成ContentProvider函数

import android.app.Activity;

import android.content.ContentValues;

import android.database.Cursor;

import android.net.Uri;

import android.os.Bundle;

import android.view.Menu;

import android.view.View;

import android.widget.Button;

import android.widget.TextView;

import com.example.testcontentprovider.FirstProviderMetaData.UserTableMetaData;

public class MainActivity extends Activity {

private Button insert = null;

private Button query = null;

private String strResult = "";

private TextView result = null;

@Override

protected void onCreate(Bundle savedInstanceState) {

super.onCreate(savedInstanceState);

setContentView(R.layout.activity_main);

insert = (Button)findViewById(R.id.insert);

query = (Button)findViewById(R.id.query);

result = (TextView)findViewById(R.id.result);

//System.out.println("before contentresolver");

//System.out.println(getContentResolver().getType(FirstProviderMetaData.UserTableMetaData.CONTENT_URI));

//getContentResolver();

//System.out.println("after contentresolver");

//System.out.println(getContentResolver().getType(FirstProviderMetaData.UserTableMetaData.CONTENT_URI));

insert.setOnClickListener(new View.OnClickListener() {

@Override

public void onClick(View v) {

// TODO Auto-generated method stub

ContentValues values = new ContentValues();

values.put(FirstProviderMetaData.UserTableMetaData.USER_NAME, "zhanshan");

//使用ContentResolver调用ContentProvider的insert函数

//前提是ContentProvider必须在AndroidManifest中注册

Uri uri = getContentResolver().insert(FirstProviderMetaData.UserTableMetaData.CONTENT_URI, values);

System.out.println("uri--->" + uri.toString());

}

});

query.setOnClickListener(new View.OnClickListener() {

@Override

public void onClick(View v) {

// TODO Auto-generated method stub

strResult = "";

Cursor c = getContentResolver().query

(FirstProviderMetaData.UserTableMetaData.CONTENT_URI, null,

null, null, null);

while (c.moveToNext()) {

System.out.println(c.getString(c.getColumnIndex(UserTableMetaData.USER_NAME)));

strResult += c.getString(c.getColumnIndex(UserTableMetaData.USER_NAME));

}

result.setText(strResult);

}

});

}

@Override

public boolean onCreateOptionsMenu(Menu menu) {

// Inflate the menu; this adds items to the action bar if it is present.

getMenuInflater().inflate(R.menu.main, menu);

return true;

}

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