Service的啟動

Acitivity代碼

 super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        button_start=findViewById(R.id.Button_start);
        button_stop=findViewById(R.id.Button_stop);

        button_start.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View view) {
                intent = new Intent(MainActivity.this,MyService.class);
                startService(intent);
            }
        });
        button_stop.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View view) {
                stopService(intent);
            }
        });

service代碼

public class MyService extends Service {
    public MyService() {
    }

    @Override
    public IBinder onBind(Intent intent) {
        // TODO: Return the communication channel to the service.
//        throw new UnsupportedOperationException("Not yet implemented");
        Log.i("TAG","綁定");
        return null;
    }

    @Override
    public void onCreate() {
        super.onCreate();
        Log.i("TAG","創(chuàng)建");
    }

    @Override
    public void onDestroy() {
        super.onDestroy();
        Log.i("TAG","停止");
    }
}

發(fā)送廣播切換圖片

Acitivity代碼

public class Main3Activity extends AppCompatActivity {
    private LocalBroadcastManager localBroadcastManager;
    private MyReceiver myReceiver;
    private Button button;
    private ImageView imageView;
    private Handler handler=new Handler(){
        @Override
        public void handleMessage(@NonNull Message msg) {
            super.handleMessage(msg);
        }
    };
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main3);
        button=findViewById(R.id.Button);
        imageView=findViewById(R.id.ImageView);

        MyReceiver myReceiver = new MyReceiver(handler,imageView);
        IntentFilter intentFilter = new IntentFilter();
        intentFilter.addAction("com.shuibi");
        registerReceiver(myReceiver,intentFilter);

        button.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View view) {
                Intent intent = new Intent();
                intent.setAction("com.shuibi");
                sendBroadcast(intent);
            }
        });
    }

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

service代碼

public class MyReceiver extends BroadcastReceiver {
    private android.os.Handler handler;
    private ImageView imageView;

    public MyReceiver(Handler handler, ImageView imageView) {
        this.handler = handler;
        this.imageView = imageView;
    }

    @Override
    public void onReceive(Context context, Intent intent) {
        // TODO: This method is called when the BroadcastReceiver is receiving
        // an Intent broadcast.
//        throw new UnsupportedOperationException("Not yet implemented");
        Log.i("TAG","onReceive");
        String action = intent.getAction();
        if(action.equals("com.shuibi")){
            handler.post(new Runnable() {
                @Override
                public void run() {
                    imageView.setImageResource(R.mipmap.jhg);
                }
            });
        }
    }
}