简单实现 BroadcastReceiver 回调

自定义接口UpMainData 

public interface UpMainData {
    String Start();
    String Stop();
}

创建MyReceiver04，实现UpMainData接口

public class MyReceiver04 extends BroadcastReceiver implements UpMainData{
    @Override
    public void onReceive(Context context, Intent intent) {
        String key = intent.getStringExtra("key");
        if(key.equals("1")){
            Start();
        }
        if(key.equals("2")){
           Stop();
        }
    }

    @Override
    public String Start() {
//	写入自己要实现的功能	

        String a="开始";
        return a;
    }

    @Override
    public String Stop() {
        String a="停止";
        return a;
    }
}

private Button bt,bt1;
private TextView tv;
private MyReceiver04 receiver04;

@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_main);
    bt=(Button)findViewById(R.id.bt);
    bt1=(Button)findViewById(R.id.button);
    tv=(TextView)findViewById(R.id.textView);

//注册广播，接口回调不能使用静态注册，只能动态注册
    receiver04=new MyReceiver04();
    IntentFilter intentFilter=new IntentFilter();
    intentFilter.addAction("UpdateUI");
    registerReceiver(receiver04,intentFilter);
    bt.setOnClickListener(new View.OnClickListener() {
        @Override
        public void onClick(View view) {
            Intent intent=new Intent();
            intent.putExtra("key","1");
            intent.setAction("UpdateUI");
            sendBroadcast(intent);
            String a = receiver04.Start();
            tv.setText(a);
        }
    });
    bt1.setOnClickListener(new View.OnClickListener() {
        @Override
        public void onClick(View view) {
            Intent intent=new Intent();
            intent.putExtra("key","2");
            intent.setAction("UpdateUI");
            sendBroadcast(intent);
            String a = receiver04.Stop();
            tv.setText(a);
        }
    });
}

@Override
protected void onDestroy() {
    super.onDestroy();
    unregisterReceiver(receiver04);
}