本地广播的简单示例 --Android开发

1、局部通知管理器LocalBroadcastManager，用于同一个应用中不同组件之间发送广播。由于是在同应用中发送广播，所以使用它安全性、效率也会提高。

2、本例实现简单的发送本地广播的案例

点击按钮发送本地广播，提示“收到本地广播”。

核心代码：

MainActivity.java：

public class MainActivity extends AppCompatActivity {

    private IntentFilter filter;
    private LocalReceiver localReceiver;
    private LocalBroadcastManager localBroadcastManager;
    private Button btn_send_local_broadcast;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        //创建LocalBroadcastManager（局部通知管理器）对象
        localBroadcastManager = LocalBroadcastManager.getInstance(this);

        btn_send_local_broadcast = (Button) findViewById(R.id.btn_send_local_broadcast);
        //点击按钮发送本地广播
        btn_send_local_broadcast.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                Intent intent = new Intent("com.broadcasttest.LOCAL_BROADCAST");
                localBroadcastManager.sendBroadcast(intent);//发送广播
            }
        });
        //动态注册广播
        filter = new IntentFilter();
        filter.addAction("com.broadcasttest.LOCAL_BROADCAST");
        localReceiver = new LocalReceiver();//创建广播接受者对象
        localBroadcastManager.registerReceiver(localReceiver, filter);//注册
    }

    class LocalReceiver extends BroadcastReceiver {
        @Override
        public void onReceive(Context context, Intent intent) {
            Toast.makeText(context, "收到本地广播", Toast.LENGTH_SHORT).show();
        }
    }

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