android广播机制

BroadcastReceiver用于监听被广播的事件（Intent）。BroadcastReceiver有两种注册方法：

（一）在代码中注册：好处是比较灵活，可以用于更新UI。

registerBtn = (Button)findViewById(R.id.button02);
		registerBtn.setOnClickListener(new OnClickListener()
		{
			@Override
			public void onClick(View v)
			{
				receiver = new MyBroadCastReceive();
				IntentFilter filter = new IntentFilter();
				filter.addAction(ACTION_CALL);
				MainActivity.this.registerReceiver(receiver, filter);
				
			}
		});

解除绑定：

@Override
	protected void onDestroy()
	{
		super.onDestroy();
		this.unregisterReceiver(receiver);
	}

（二）在Manifest.xml中注册：好处是应用程序被关掉，也可以接受到广播。

<receiver android:name=".MyBroadCastReceive" >
            <intent-filter >
                <action android:name="android.intent.action.CALL" />
            </intent-filter>
        </receiver>

发送广播：

sendBdBtn.setOnClickListener(new OnClickListener()
		{
			@Override
			public void onClick(View v)
			{
				Intent intent = new Intent();
				intent.setAction(Intent.ACTION_CALL);
				MainActivity.this.sendBroadcast(intent);
				
			}
		});

接收广播：

public class MyBroadCastReceive extends BroadcastReceiver
{

	public MyBroadCastReceive()
	{
		Log.e("---","-----");
	}
	@Override
	public void onReceive(Context context, Intent intent)
	{
		Log.e("onReceive","onRecerve");
	}
}

android内置的 Standard Broadcast Actions可以在android.content.Intent中找到。