4月7日学习日志

今天学习了监听广播。

public class MyBRReceiver extends BroadcastReceiver{
    @Override
    public void onReceive(Context context, Intent intent) {
        Toast.makeText(context,"网络状态发生改变~",Toast.LENGTH_SHORT).show();
    }
}

public class MainActivity extends AppCompatActivity {

    MyBRReceiver myReceiver;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        //核心部分代码：
        myReceiver = new MyBRReceiver();
        IntentFilter itFilter = new IntentFilter();
        itFilter.addAction("android.net.conn.CONNECTIVITY_CHANGE");
        registerReceiver(myReceiver, itFilter);
    }

    //别忘了将广播取消掉哦~
    @Override
    protected void onDestroy() {
        super.onDestroy();
        unregisterReceiver(myReceiver);
    }
}