本文來自[http://blog.csdn.net/hellogv/](http://blog.csdn.net/hellogv/) ，引用必須注明出處！ ?????? 前面分別討論了[Activity](http://blog.csdn.net/hellogv/archive/2010/11/06/5992198.aspx)和[Service](http://blog.csdn.net/hellogv/archive/2010/11/08/5994952.aspx)，這次就輪到BroastcastReceiver，Broastcast是應用程序間通信的手段。BroastcastReceiver也是跟Intent緊密相連的，動態/靜態注冊了BroastcastReceiver之后，使用sendBroadcast把Intent發送之后，系統會自動把符合條件的BroastcastReceiver啟動，跟嵌入式系統的中斷類似。 ??????? 本文主要演示了如何靜態/動態注冊BroastcastReceiver，向系統索取電量信息，以及枚舉信息的字段。本文運行截圖如下：   上圖是發送Intent至內部動態注冊的BroadcastReceiver，接收到之后顯示消息名稱。動態注冊BroadcastReceiver用到registerReceiver()。 ?  上圖是發送Intent至內部靜態注冊的BroadcastReceiver，接收到之后顯示消息名稱。靜態注冊比動態注冊麻煩點，先新建一個類繼承BroadcastReceiver，然后到AndroidManifest.xml 添加 ~~~ <receiver android:name="clsReceiver2"> <intent-filter> <action android:name="com.testBroadcastReceiver.Internal_2"/> </intent-filter> </receiver> ~~~ 第一個name是類名，第二個是action的名稱。  上圖是枚舉Intent消息的字段，這個功能比較適合懶人，把收到的Intent消息的字段全部分解了，再看看哪個需要的，懶得記住。實現這部分的代碼如下： //當未知Intent包含的內容，則需要通過以下方法來列舉 Bundle b=intent.getExtras(); Object[] lstName=b.keySet().toArray(); for(int i=0;i<lstName.length;i++) { String keyName=lstName[i].toString(); Log.e(keyName,String.valueOf(b.get(keyName))); } main.xml的代碼如下： ~~~ <?xml version="1.0" encoding="utf-8"?><LinearLayout xmlns:android="http://schemas.android.com/apk/res/android" android:orientation="vertical" android:layout_width="fill_parent" android:layout_height="fill_parent"> <Button android:id="@+id/Button01" android:layout_width="wrap_content" android:layout_height="wrap_content" android:text="發送至內部動態注冊的BroadcastReceiver"></Button> <Button android:id="@+id/Button02" android:layout_width="wrap_content" android:layout_height="wrap_content" android:text="發送至內部靜態注冊BroadcastReceiver"></Button> <Button android:id="@+id/Button03" android:layout_width="wrap_content" android:layout_height="wrap_content" android:text="發送至系統BroadcastReceiver"></Button></LinearLayout> ~~~ testBroadcastReceiver.java的代碼如下： ~~~ package com.testBroadcastReceiver;import android.app.Activity;import android.content.BroadcastReceiver;import android.content.Context;import android.content.Intent;import android.content.IntentFilter;import android.os.Bundle;import android.util.Log;import android.view.View;import android.widget.Button;import android.widget.Toast;public class testBroadcastReceiver extends Activity { Button btnInternal1,btnInternal2,btnSystem; static final String INTENAL_ACTION_1 = "com.testBroadcastReceiver.Internal_1"; static final String INTENAL_ACTION_2 = "com.testBroadcastReceiver.Internal_2"; static final String INTENAL_ACTION_3 = "com.testBroadcastReceiver.Internal_3"; @Override public void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.main); btnInternal1=(Button)this.findViewById(R.id.Button01); btnInternal1.setOnClickListener(new ClickEvent()); btnInternal2=(Button)this.findViewById(R.id.Button02); btnInternal2.setOnClickListener(new ClickEvent()); btnSystem=(Button)this.findViewById(R.id.Button03); btnSystem.setOnClickListener(new ClickEvent()); //動態注冊廣播消息 registerReceiver(bcrIntenal1, new IntentFilter(INTENAL_ACTION_1)); } class ClickEvent implements View.OnClickListener{ @Override public void onClick(View v) { if(v==btnInternal1)//給動態注冊的BroadcastReceiver發送數據 { Intent intent = new Intent(INTENAL_ACTION_1); sendBroadcast(intent); } else if(v==btnInternal2)//給靜態注冊的BroadcastReceiver發送數據 { Intent intent = new Intent(INTENAL_ACTION_2); sendBroadcast(intent); } else if(v==btnSystem)//動態注冊 接收2組信息的BroadcastReceiver { IntentFilter filter = new IntentFilter();// filter.addAction(Intent.ACTION_BATTERY_CHANGED);//系統電量檢測信息 filter.addAction(INTENAL_ACTION_3);//第三組自定義消息 registerReceiver(batInfoReceiver, filter); Intent intent = new Intent(INTENAL_ACTION_3); intent.putExtra("Name", "hellogv"); intent.putExtra("Blog", "http://blog.csdn.net/hellogv"); sendBroadcast(intent);//傳遞過去 } } } /* * 接收動態注冊廣播的BroadcastReceiver */ private BroadcastReceiver bcrIntenal1 = new BroadcastReceiver() { public void onReceive(Context context, Intent intent) { String action = intent.getAction(); Toast.makeText(context, "動態:"+action, 1000).show(); } }; private BroadcastReceiver batInfoReceiver = new BroadcastReceiver() { public void onReceive(Context context, Intent intent) { String action = intent.getAction(); //如果捕捉到的action是ACTION_BATTERY_CHANGED if (Intent.ACTION_BATTERY_CHANGED.equals(action)) { //當未知Intent包含的內容，則需要通過以下方法來列舉 Bundle b=intent.getExtras(); Object[] lstName=b.keySet().toArray(); for(int i=0;i<lstName.length;i++) { String keyName=lstName[i].toString(); Log.e(keyName,String.valueOf(b.get(keyName))); } } //如果捕捉到的action是INTENAL_ACTION_3 if (INTENAL_ACTION_3.equals(action)) { //當未知Intent包含的內容，則需要通過以下方法來列舉 Bundle b=intent.getExtras(); Object[] lstName=b.keySet().toArray(); for(int i=0;i<lstName.length;i++) { String keyName=lstName[i].toString(); Log.e(keyName,b.getString(keyName)); } } } };} ~~~ clsReceiver2.java的代碼如下： ~~~ package com.testBroadcastReceiver;import android.content.BroadcastReceiver;import android.content.Context;import android.content.Intent;import android.widget.Toast;/* * 接收靜態注冊廣播的BroadcastReceiver， * step1:要到AndroidManifest.xml這里注冊消息 * <receiver android:name="clsReceiver2"> <intent-filter> <action android:name="com.testBroadcastReceiver.Internal_2"/> </intent-filter> </receiver> step2:定義消息的字符串 step3:通過Intent傳遞消息來驅使BroadcastReceiver觸發 */public class clsReceiver2 extends BroadcastReceiver{ @Override public void onReceive(Context context, Intent intent) { String action = intent.getAction(); Toast.makeText(context, "靜態:"+action, 1000).show(); }} ~~~