android之BroadcastReceiver实例

BroadcastReceiver监听步骤

1.实现BroadcastReceiver子类，并在androidmainfest.xml注册监听者,并设置action属性

public class MyReceiver extends BroadcastReceiver {@Overridepublic void onReceive(Context context, Intent intent) {Toast.makeText(context,intent.getAction() + "\n消息的内容是:" + intent.getStringExtra("msg"),Toast.LENGTH_LONG).show();}}

        <receiver             android:name="com.android.xiong.bordcasetestonetest.MyReceiver">           <intent-filter>               <action android:name="com.android.xiong.bordcasetestonetest.MYRECEIVER"/>           </intent-filter>        </receiver>

2.创建Intent对象并设置Action属性，然后广播消息(广播有两种一种是普通广播，一种是有序广播；有序广播是通过设置优先级来一个一个来接收广播信息接收的后者可以得到前接收者的广播修改信息)

//创建Intent对象Intent intent=new Intent();intent.setAction("com.android.xiong.bordcasetestonetest.MYRECEIVER");intent.putExtra("msg", "简单的消息");//发送广播sendBroadcast(intent);

实例

package com.example.musicbox;import android.os.Bundle;import android.app.Activity;import android.content.BroadcastReceiver;import android.content.Context;import android.content.Intent;import android.content.IntentFilter;import android.view.Menu;import android.view.View;import android.view.View.OnClickListener;import android.widget.Button;import android.widget.TextView;public class MainActivity extends Activity implements OnClickListener {private TextView title, author;private Button play, stop;public static final String CTL_ACTION = "com.android.xiong.CTL_ACTION";public static final String UPDATE_ACTION = "com.android.xiong.UPDATE_ACTION";// 定义音乐的播放状态 0x11代表没有播放 0x12表示正在播放 0x13表示暂停中int status = 0x11;String[] titleStrs = new String[] { "心愿", "约定", "美丽的新世界" };String[] authorStrs = new String[] { "未知艺术家", "周蕙", "五百" };private ActivityReceiver activitys;@Overrideprotected void onCreate(Bundle savedInstanceState) {super.onCreate(savedInstanceState);setContentView(R.layout.activity_main);title = (TextView) findViewById(R.id.title);author = (TextView) findViewById(R.id.author);play = (Button) findViewById(R.id.play);stop = (Button) findViewById(R.id.stop);play.setOnClickListener(this);stop.setOnClickListener(this);// 创建IntentFilterIntentFilter filter = new IntentFilter();filter.addAction(UPDATE_ACTION);activitys = new ActivityReceiver();registerReceiver(activitys, filter);Intent intentService = new Intent(this, MusicService.class);// 启动ServicestartService(intentService);}@Overridepublic 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;}// 自定义的BoradcastReceiver，负责监听从Serive传回来的广播public class ActivityReceiver extends BroadcastReceiver {@Overridepublic void onReceive(Context context, Intent intent) {// 获取Intent中的update消息 ,update代表播放状态int update = intent.getIntExtra("update", -1);// 获取Intent中的current消息,current代表当前正在播放的歌曲int current = intent.getIntExtra("current", -1);if (current >= 0) {title.setText(titleStrs[current]);author.setText(authorStrs[current]);}switch (update) {case 0x11:status = 0x11;break;// 控制系统进入播放状态case 0x12:status = 0x12;break;//控制系统进入暂停状态case 0x13:status = 0x13;break;}}}@Overridepublic void onClick(View v) {// 创建IntentIntent intent = new Intent("com.android.xiong.CTL_ACTION");switch (v.getId()) {case R.id.play:intent.putExtra("control", 1);break;case R.id.stop:intent.putExtra("control", 2);break;default:break;}//发送广播sendBroadcast(intent);}}

package com.example.musicbox;import android.app.Service;import android.content.BroadcastReceiver;import android.content.Context;import android.content.Intent;import android.content.IntentFilter;import android.content.res.AssetFileDescriptor;import android.content.res.AssetManager;import android.media.MediaPlayer;import android.media.MediaPlayer.OnCompletionListener;import android.os.IBinder;public class MusicService extends Service {MyReceviver serviceReceviver;AssetManager am;String[] musics = new String[] { "wish.mp3", "promise.mp3", "beautiful.mp3" };MediaPlayer mPlayer;// 当前的状态,0x11代表没有播放;0x12代表正在播放;0x13代表暂停int status = 0x11;// 记录当前正在播放的音乐int current = 0;@Overridepublic IBinder onBind(Intent intent) {return null;}@Overridepublic void onCreate() {am = getAssets();// 创建BroadcastRecerserviceReceviver = new MyReceviver();// 创建IntentFilterIntentFilter filter = new IntentFilter();filter.addAction(MainActivity.CTL_ACTION);registerReceiver(serviceReceviver, filter);// 创建MediaPlay播放完成事件绑定的监听器mPlayer = new MediaPlayer();mPlayer.setOnCompletionListener(new OnCompletionListener() {@Overridepublic void onCompletion(MediaPlayer mp) {current++;if (current >= 3) {current = 0;}// 发送广播通知的activity更改文本Intent sendIntent = new Intent(MainActivity.UPDATE_ACTION);sendIntent.putExtra("current", current);// 发送广播，将被activity组件的BroadcastReceiver接收sendBroadcast(sendIntent);// 准备并播放音乐preparAndplay(musics[current]);}});super.onCreate();}public class MyReceviver extends BroadcastReceiver {@Overridepublic void onReceive(Context context, Intent intent) {int control = intent.getIntExtra("control", -1);switch (control) {//播放或暂停case 1://原来处于没有播放状态if(status==0x11){//准备并播放音乐preparAndplay(musics[current]);status=0x12;}//原来处于播放的状态else if(status==0x12){//暂停mPlayer.pause();//改变为暂停的状态status=0x13;}//原来处于暂停的状态else if(status==0x13){//播放mPlayer.start();//改变为播放状态status=0x12;}break;//停止播放case 2://如果原来正在播放if(status==0x12||status==0x13){//停止播放mPlayer.stop();status=0x11;}default:break;}//广播通知Activity更改文本Intent sendIntent=new Intent(MainActivity.UPDATE_ACTION);sendIntent.putExtra("update", status);sendIntent.putExtra("current",current);//发送广播sendBroadcast(sendIntent);}}private void preparAndplay(String music) {try {// 打开指定的文件AssetFileDescriptor afd = am.openFd(music);mPlayer.reset();// 使用MediaPlayer加载指定的文件mPlayer.setDataSource(afd.getFileDescriptor(),afd.getStartOffset(), afd.getLength());// 准备声音mPlayer.prepare();// 播放mPlayer.start();} catch (Exception e) {e.printStackTrace();}}}

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