Android 广播的代码注册与简单使用

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1、自定义广播

public class MyBroadcastReceiver extends BroadcastReceiver {    @Override    public void onReceive(Context context, Intent intent) {    Log.i("syx", "接收到了广播，可在此做处理");    }}

2、使用广播
（1）自定义Action用于开启广播

public static final String BROADCAST_ACTION = “what.you.want.just.do.it.by.yourself”;

（2）声明自定义的广播
/**
* 自定义广播
*/
private MyBroadcastReceiver receiver;

（3）代码中注册广播

receiver = new MyBroadcastReceiver();IntentFilter intentFilter = new IntentFilter();intentFilter.addAction(BROADCAST_ACTION);registerReceiver(receiver, intentFilter);

（4）操作的地方发出此广播事件，使用Intent

findViewById(R.id.click).setOnClickListener(new OnClickListener() {        @Override        public void onClick(View v) {            Intent intent = new Intent();              intent.setAction(BROADCAST_ACTION);              MainActivity.this.sendBroadcast(intent);          }    });

（5）界面销毁的地方清除注册的广播，防止内存泄漏

@Overrideprotected void onDestroy() {    super.onDestroy();    if (null!=receiver) {        unregisterReceiver(receiver);    }}

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