Android中廣播的作用是非常明顯的，當我們收到一條信息，可能我們的應用需要處理一些數據，可能我們開機，我們的應用也需要處理一些數據，這里都用到了廣播機制，這里簡單的實現了一個自定義廣播，看實例： MyBroadcastReceiver.java package com.example.broadcastreceiver;import android.content.BroadcastReceiver; import android.content.Context; import android.content.Intent; import android.widget.Toast;public class MyBroadcastReceiver extends BroadcastReceiver {@Override public void onReceive(Context arg0, Intent arg1) { // TODO Auto-generated method stub Toast.makeText(arg0, "onReceive", Toast.LENGTH_SHORT).show(); }} MainActivity.java package com.example.broadcastreceiver;import android.os.Bundle; import android.app.Activity; import android.content.Intent; import android.view.Menu; import android.view.View; import android.view.View.OnClickListener; import android.widget.Button;public class MainActivity extends Activity {@Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.activity_main);Button btn = (Button)findViewById(R.id.button1); btn.setOnClickListener(new OnClickListener(){@Override public void onClick(View arg0) { // TODO Auto-generated method stub Intent intent = new Intent(); intent.setAction("justsoso"); sendBroadcast(intent); }}); }@Override public boolean onCreateOptionsMenu(Menu menu) { // Inflate the menu; this adds items to the action bar if it is present. getMenuInflater().inflate(R.menu.activity_main, menu); return true; }} AndroidManifest.xml <?xml version="1.0" encoding="utf-8"?> <manifest xmlns:android="http://schemas.android.com/apk/res/android" package="com.example.broadcastreceiver" android:versionCode="1" android:versionName="1.0" ><uses-sdk android:minSdkVersion="8" android:targetSdkVersion="16" /><application android:allowBackup="true" android:icon="@drawable/ic_launcher" android:label="@string/app_name" android:theme="@style/AppTheme" > <activity android:name="com.example.broadcastreceiver.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><receiver android:name=".MyBroadcastReceiver" > <intent-filter> <action android:name="justsoso" > </action> </intent-filter> </receiver> </application></manifest> 當點擊按鈕以后，就會返回廣播觸發的事件了

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