Android 服务(Service)

Service的代码：

public class MyService extends Service {
    MyBinder myBinder = new MyBinder();
    @Nullable
    @Override
    public IBinder onBind(Intent intent) {
        //放回的Ibinder是一个接口，放回Binder对象（继承了IBinder）也可以
        //返回的Binder会传入到ServiceConnection的重写方法onServiceConnected中
        Log.d("MyService" , "onBind: ");
        return myBinder;
    }

    @Override
    public void onRebind(Intent intent) {
        super.onRebind(intent);
        Log.d("MyService" , "onRebind: ");
        //当onUnbind的返回值为true时，与该服务绑定的活动离开视线后再重新回到视线后，重新bindService时会调用
    }

    @Override
    public boolean onUnbind(Intent intent) {
        Log.d("MyService" , "onUnbind: ");
        return true;

    }



    @Override
    public void onCreate() {
        //在onBind或onStartCommand前调用
        super.onCreate();
        Log.d("MyService" , "onCreat: ");
    }

    @Override
    public int onStartCommand(Intent intent, int flags, int startId) {
        Log.d("MyService" , "onStatrCommand: ");
        return super.onStartCommand(intent, flags, startId);
        //startService时调用

    }

    @Override
    public void onDestroy() {
        super.onDestroy();
        Log.d("MyService" , "onDestory: ");
        //stopService时调用
    }
}

layout：

IntentService：解决耗时工作–在子线程中运行，结束会自动回调ondestory()

//为了实现多线程操作一些耗时的时候忘记stopService时的IntentService
//该类的功能时实现一些耗时工作后并自动关闭服务
public class MyIntentService extends IntentService {
    //一定要有无参构造函数，且要super一下父类的带参构造函数
    public MyIntentService() {
        super("MyIntentService");
    }


    @Override
    protected void onHandleIntent(@Nullable Intent intent) {
        //此方法在子线程中运行，可以处理一下耗时的工作，具体逻辑自己写
        Log.d("MyIntentService", "onHandleIntent: ");
    }

    //onHandleIntent执行结束后会自动调用onDestory()
    @Override
    public void onDestroy() {
        super.onDestroy();
        Log.d("MyIntentService", "onDestroy: ");
    }
}

Binder：

public class MyBinder extends Binder {
    //在绑定的时候充当onBind的返回类型
    public void startDownload(){
        Log.d("MyService", "startDownload: ");
    }
    public void getProgress(){
        Log.d("MyService", "getProgress: ");
    }
}

主函数：

public class MainActivity extends AppCompatActivity {
     MyBinder myBinder;
     Intent intent;
     Intent intentService;
     ServiceConnection serviceConnection = new ServiceConnection(){
         @Override
         public void onServiceConnected(ComponentName name, IBinder service) {
             Log.d("MyService", "onServiceConnected: ");
             myBinder = (MyBinder) service;
             myBinder.getProgress();
             myBinder.startDownload();
         }

         @Override
         public void onServiceDisconnected(ComponentName name) {
             Log.d("MyService", "onServiceDisconnected: ");
         }
     };

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        intent = new Intent(this, MyService.class);
        intentService = new Intent(this,MyIntentService.class);
    }

    public void sendService(View view) {
        startService(intent);
    }

    public void stopService(View view) {
        stopService(intent);
    }

    public void bindService(View view) {
        bindService(intent,serviceConnection,0);
    }

    public void unbindService(View view) {
        unbindService(serviceConnection);
    }

    public void sendIntentService(View view) {

        startService(intentService);
    }
}