ContentProvider实现两个程序间共享数据

实现点击图一中的按钮，在log中查看执行结果---点击联系人信息出现图一下方的listview-----长按其中的某item，如图二----点击查看电话---如图三所示

创建一个android项目contentProviderDemo

创建另一个项目content2

先运行contentProviderDemo，再运行content2

//建立数据库

package com.example.contentproviderdemo;

import android.content.Context;

import android.database.sqlite.SQLiteDatabase;

import android.database.sqlite.SQLiteDatabase.CursorFactory;

import android.database.sqlite.SQLiteOpenHelper;

import android.provider.BaseColumns;

public class DbHelper extends SQLiteOpenHelper{

public DbHelper(Context context) {

super(context, "my.db", null, 1);

// TODO Auto-generated constructor stub

}

@Override

public void onCreate(SQLiteDatabase db) {

// TODO Auto-generated method stub

db.execSQL("create table user("+BaseColumns._ID+"integer primary key ,name varchar(10))");

}

@Override

public void onUpgrade(SQLiteDatabase db, int oldVersion, int newVersion) {

// TODO Auto-generated method stub

}

}

------------------------------------------

package com.example.contentproviderdemo;

import android.app.Activity;

import android.os.Bundle;

import android.view.Menu;

import android.view.MenuItem;

public class Main2Activity extends Activity {

@Override

protected void onCreate(Bundle savedInstanceState) {

super.onCreate(savedInstanceState);

setContentView(R.layout.activity_main2);

}

@Override

public boolean onCreateOptionsMenu(Menu menu) {

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

getMenuInflater().inflate(R.menu.main2, menu);

return true;

}

@Override

public boolean onOptionsItemSelected(MenuItem item) {

// Handle action bar item clicks here. The action bar will

// automatically handle clicks on the Home/Up button, so long

// as you specify a parent activity in AndroidManifest.xml.

int id = item.getItemId();

if (id == R.id.action_settings) {

return true;

}

return super.onOptionsItemSelected(item);

}

}

------------------------------

package com.example.contentproviderdemo;

import android.content.ContentProvider;

import android.content.ContentUris;

import android.content.ContentValues;

import android.content.UriMatcher;

import android.database.Cursor;

import android.database.sqlite.SQLiteDatabase;

import android.database.sqlite.SQLiteQueryBuilder;

import android.net.Uri;

//实现数据共享--一个程序访问另一个程序

public class MyContentProvider extends ContentProvider {

// 匹配规则

private static UriMatcher uriMatcher = null;

private static String authority = "com.example.contentproviderdemo.MyContentProvider";

private static String path = "user";

private DbHelper dbHelper = null;

static {

uriMatcher = new UriMatcher(UriMatcher.NO_MATCH);

uriMatcher.addURI(authority, path, 1);//

}

@Override

public boolean onCreate() {

// 实例化help类

dbHelper = new DbHelper(getContext());

return false;

}

@Override

public Cursor query(Uri uri, String[] projection, String selection,

String[] selectionArgs, String sortOrder) {

SQLiteDatabase sQLiteDatabase = dbHelper.getReadableDatabase();

// 判断查询的哪个表

SQLiteQueryBuilder sqLiteQueryBuilder = new SQLiteQueryBuilder();

switch (uriMatcher.match(uri)) {

case 1:

sqLiteQueryBuilder.setTables("user");

default:

break;

}

/*

* sQLiteDatabase.query(sqLiteQueryBuilder.getTables(), null, selection,

* selectionArgs, null, null, null);

*/

// sqLiteQueryBuilder

Cursor cursor = sqLiteQueryBuilder.query(sQLiteDatabase, projection,

selection, selectionArgs, null, null, sortOrder);

return cursor;

}

//用于，匹配activity，见清单文件

@Override

public String getType(Uri uri) {

switch (uriMatcher.match(uri)) {

case 1:

return "vnd.android.cursor.item/yy";

default:

break;

}

return null;

}

@Override

public Uri insert(Uri uri, ContentValues values) {

SQLiteDatabase sQLiteDatabase = dbHelper.getWritableDatabase();

// 匹配uri

switch (uriMatcher.match(uri)) {

case 1:

long id = sQLiteDatabase.insert("user", null, values);

// 给uri绑定id

Uri newUri = ContentUris.withAppendedId(uri, id);

return newUri;

default:

break;

}

return null;

}

@Override

public int delete(Uri uri, String selection, String[] selectionArgs) {

SQLiteDatabase sQLiteDatabase = dbHelper.getWritableDatabase();

switch (uriMatcher.match(uri)) {

case 1:

int ucount = sQLiteDatabase

.delete("user", selection, selectionArgs);

return ucount;

default:

break;

}

return 0;

}

@Override

public int update(Uri uri, ContentValues values, String selection,

String[] selectionArgs) {

SQLiteDatabase sQLiteDatabase = dbHelper.getWritableDatabase();

switch (uriMatcher.match(uri)) {

case 1:

int delcount = sQLiteDatabase.update("user", values, selection,

selectionArgs);

return delcount;

default:

break;

}

return 0;

}

}

------------------

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

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

package="com.example.contentproviderdemo"

android:versionCode="1"

android:versionName="1.0" >

<uses-sdk

android:minSdkVersion="14"

android:targetSdkVersion="21" />

<application

android:allowBackup="true"

android:icon="@drawable/ic_launcher"

android:label="@string/app_name"

android:theme="@style/AppTheme" >

<activity

android:name=".MainActivity"

android:label="@string/app_name" >

<intent-filter>

<action android:name="android.intent.action.MAIN" />

<category android:name="android.intent.category.LAUNCHER" />

</intent-filter>

</activity>

<provider

android:name=".MyContentProvider"

android:authorities="com.example.contentproviderdemo.MyContentProvider"

android:exported="true" >

</provider>

<activity

android:name=".Main2Activity"

android:label="@string/title_activity_main2" >

<intent-filter>

<action android:name="test"></action>

<category android:name="android.intent.category.DEFAULT"></category>

<data android:mimeType="vnd.android.cursor.item/yy"></data>

</intent-filter>

</activity>

</application>

</manifest>

-------创建另一个项目---content2---这里对上一个应用程序进行数据访问---增删查改---从该应用程序一界面跳转到另一个应用程序的某一界面----获取手机中联系人号码--

package com.example.content2;

import java.util.ArrayList;

import java.util.HashMap;

import java.util.List;

import java.util.Map;

import android.app.Activity;

import android.content.ContentValues;

import android.content.Intent;

import android.database.Cursor;

import android.net.Uri;

import android.os.Bundle;

import android.provider.ContactsContract;

import android.provider.ContactsContract.StatusUpdates;

import android.view.ContextMenu;

import android.view.ContextMenu.ContextMenuInfo;

import android.view.Menu;

import android.view.MenuItem;

import android.view.View;

import android.view.View.OnClickListener;

import android.widget.AdapterView.AdapterContextMenuInfo;

import android.widget.ArrayAdapter;

import android.widget.Button;

import android.widget.ListView;

import android.widget.SimpleAdapter;

import android.widget.Toast;

public class MainActivity extends Activity implements OnClickListener {

private Uri uri = Uri.parse("content://"

+ "com.example.contentproviderdemo.MyContentProvider" + "/user");

private ListView listView;

private List<String> list = null;

private List<Integer> idList=null;

@Override

protected void onCreate(Bundle savedInstanceState) {

super.onCreate(savedInstanceState);

setContentView(R.layout.activity_main);

//

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

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

Button updateButton = (Button) findViewById(R.id.update);

Button deleteButton = (Button) findViewById(R.id.delete);

Button goButton = (Button) findViewById(R.id.go);

Button readButton = (Button) findViewById(R.id.read);

listView = (ListView) findViewById(R.id.listView);

insertButton.setOnClickListener(this);

queryButton.setOnClickListener(this);

updateButton.setOnClickListener(this);

deleteButton.setOnClickListener(this);

goButton.setOnClickListener(this);

readButton.setOnClickListener(this);

}

@Override

public void onClick(View v) {

// TODO Auto-generated method stub

switch (v.getId()) {

case R.id.insert:

// 插入数据

ContentValues values = new ContentValues();

values.put("name", "qq");

//getContentResolver()

Uri newUri = getContentResolver().insert(uri, values);

System.out.println(newUri.toString());

break;

case R.id.query:

// 查询所有

Cursor cursor = getContentResolver().query(uri, null, null, null,

null);

for (cursor.moveToFirst(); !cursor.isAfterLast(); cursor

.moveToNext()) {

System.out.println(cursor.getString(cursor

.getColumnIndex("name")));

}

break;

case R.id.update:

//

ContentValues contvalues = new ContentValues();

contvalues.put("name", "ww");

//注意参数的写法（数据库）--》"name=?"

int ucount = getContentResolver().update(uri, contvalues, "name=?",

new String[] { "qq" });

System.out.println("update" + ucount);

break;

case R.id.delete:

// 删除所有

int delcount = getContentResolver().delete(uri, null, null);

System.out.println("delete" + delcount);

break;

case R.id.go:

// 跳转到contentProviderDemo项目里的main2Activity

Intent intent = new Intent();

intent.setAction("test");

intent.setData(uri);//----

startActivity(intent);

case R.id.read:

// 为listView注册上下文菜单

registerForContextMenu(listView);

// 读取联系人

Uri uri2 = ContactsContract.Contacts.CONTENT_URI;

Cursor cursor2 = getContentResolver().query(uri2, null, null, null,

null);

//

list = new ArrayList<String>();

idList=new ArrayList<Integer>();

for (cursor2.moveToFirst(); !cursor2.isAfterLast(); cursor2

.moveToNext()) {

// System.out.println(cursor2.getString(cursor2.getColumnIndex(ContactsContract.Contacts.DISPLAY_NAME)));

list.add(cursor2.getString(cursor2

.getColumnIndex(ContactsContract.Contacts.DISPLAY_NAME)));

idList.add(cursor2.getInt(cursor2.getColumnIndex(ContactsContract.Contacts._ID)));

}

listView.setAdapter(new ArrayAdapter<String>(this,

android.R.layout.simple_list_item_1, list));

}

}

@Override

public boolean onContextItemSelected(MenuItem item) {

//适配上下文菜单信息

AdapterContextMenuInfo info=(AdapterContextMenuInfo) item.getMenuInfo();

//

// 根据点击的获取下标

int position = info.position;

// 根据此下标获取id

String contactsId = idList.get(position).toString();

System.out.println(position+"===========" + contactsId);//--------

switch (item.getItemId()) { // 进行菜单的操作(2个菜单项)

case 1:

// 查看号码：当前点击的联系人的id(position（从0开始）----表中id从1开始自增的)----》表中查询----》号码

String phoneSelection = ContactsContract.CommonDataKinds.Phone.CONTACT_ID

+ "=?";

String[] phoneSelectionArgs = new String[] { contactsId };

//phoneSelection+phoneSelectionArgs-->拼接成完整sql语句

//ContactsContract.CommonDataKinds.Phone.CONTENT_URI--------------------------------

Cursor c = /*super.*/getContentResolver().query(

ContactsContract.CommonDataKinds.Phone.CONTENT_URI, null,

phoneSelection, phoneSelectionArgs, null);

// select * from user where id=?----->?由点击listView所获取

StringBuffer buf = new StringBuffer();

buf.append("电话号码是：");

System.out.println(c.getCount());

for (c.moveToFirst(); !c.isAfterLast(); c.moveToNext()) {

buf.append(c.getString(c

.getColumnIndex(ContactsContract.CommonDataKinds.Phone.NUMBER)));

}

Toast.makeText(this, buf, Toast.LENGTH_SHORT).show();

break;

case 2:

//删除联系人

break;

}

return super.onContextItemSelected(item);

}

// 创建菜单

@Override

public void onCreateContextMenu(ContextMenu menu, View v,

ContextMenuInfo menuInfo) {

super.onCreateContextMenu(menu, v, menuInfo);

if (v == listView) {

menu.setHeaderTitle("联系人信息");

menu.add(Menu.NONE, 1, 1, "查看电话");

menu.add(Menu.NONE, 2, 2, "删除信息");

}

}

public void adapter() {

// Context context, List<? extends Map<String, ?>> data, int resource,

// String[] from, int[] to

List<Map<String, String>> listMap = new ArrayList<Map<String, String>>();

Map<String, String> map = new HashMap<String, String>();

for (int i = 0; i < list.size(); i++) {

map.put("name", list.get(i));

listMap.add(map);

}

System.out.println(listMap);// ---------

SimpleAdapter adapter = new SimpleAdapter(this, listMap,

R.layout.text_layout, new String[] { "name" },

new int[] { R.id.textView });

listView.setAdapter(adapter);

}

}

-------------清单文件--由于上面点击read按钮--获取手机中联系人的号码--这里要配置相应权限--

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

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

package="com.example.content2"

android:versionCode="1"

android:versionName="1.0" >

<uses-sdk

android:minSdkVersion="14"

android:targetSdkVersion="21" />

<uses-permission android:name="android.permission.WRITE_CONTACTS" />

<uses-permission android:name="android.permission.READ_CONTACTS" />

<application

android:allowBackup="true"

android:icon="@drawable/ic_launcher"

android:label="@string/app_name"

android:theme="@style/AppTheme" >

<activity

android:name=".MainActivity"

android:label="@string/app_name" >

<intent-filter>

<action android:name="android.intent.action.MAIN" />

<category android:name="android.intent.category.LAUNCHER" />

</intent-filter>

</activity>

</application>

</manifest>