android中如何發送一個廣播

1.首先要聲明廣播

private BroadcastReceiver mBroadcastReceiver = new BroadcastReceiver()
{
	@Override
	public void onReceive(Context context, Intent intent) //onReceive函數不能作耗時的事情，參考值：10s之內
	{
		Log.d("scott", "on receive action="+intent.getAction());
		String action = intent.getAction();
		if (action.equals("com.scott.sayhi"))
		{
			showDialog("on receive action="+intent.getAction());
		}
	}
};

2.其次要註冊廣播，有兩種方式：xml註冊和代碼註冊

xml註冊：

<receiver android:name="com.scott.sayhi.MyBroadcastReceiver" >
<intent-filter>
<action android:name="com.scott.sayhi" />
</intent-filter>
</receiver>

代碼註冊：

IntentFilter filter = new IntentFilter();
filter.addAction("com.scott.sayhi");
MyActivity.this.registerReceiver(mBroadcastReceiver, filter);

上述2個步驟就能夠了。

3.發送廣播

Intent intent = new Intent();
intent.setFlags(Intent.FLAG_ACTIVITY_NEW_TASK);
intent.setAction("com.scott.sayhi");
MyActivity.this.sendBroadcast(intent);

4.收聽開機廣播

intent-filter設置以下便可

<intent-filter> <action android:name="android.intent.action.BOOT_COMPLETED" /> <category android:name="android.intent.category.HOME" /> </intent-filter>