Activity与Service通信

来源：互联网发布：伦佐皮亚诺知乎编辑：程序博客网时间：2024/05/29 07:03

1、使用广播

2、使用ServiceConnection

采用startService启动Service：

Service会经历OnCreate然后是onStartonStartCommand(Intent intent, int flags, int startId),接着一直处于运行状态，知道stopService的时候调用onDestroy方法，如果调用者自己直接退出而没有调用stopService的话，Service会一直在后台运行着。

如果调用Context.startService()前服务已经被创建，则多次调用startService不会导致服务被多次的创建，但会导致多次调用onstartCommand方法。

采用BindService

调用者与与服务绑定在了一起，调用者一旦退出，服务也就终止，大有不求同生但求同死

onbind()只有采用Context.bindService（）方法启动服务时才会回调该方法，当调用者与服务已经绑定的时候，多次调用Context.bindService（）不会导致这个方法被多次的调用。

采用 Context.bindService()方法启动服务时只能调用onUnbind()方法解除调用者与服务者，服务结束时才会调用onDestroy()方法。

不和ACtivity交互的本地服务

public class localService extends Service {

@Override
public IBinder onBind(Intent intent) {
  System.out.println("IBinder()");
  return null;
}
@Override
public void onCreate() {
  System.out.println("onCreate()");
  super.onCreate();
}
@Override
public void onDestroy() {
  System.out.println("ondestroy");
  super.onDestroy();
}
@Override
public int onStartCommand(Intent intent, int flags, int startId) {
  System.out.println("onstartCommand(0");
  return super.onStartCommand(intent, flags, startId);
}

}

public class MainActivity extends Activity implements OnClickListener{
private Button startBtn,stopBtn;
private TextView tv;
Intent intent;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        startBtn=(Button) findViewById(R.id.start);
        stopBtn=(Button) findViewById(R.id.stop);
        tv=(TextView) findViewById(R.id.textView1);
        startBtn.setOnClickListener(this);
        stopBtn.setOnClickListener(this);
    }

@Override
public void onClick(View v) {

  switch (v.getId()) {

  case R.id.start:
   tv.setText("sdsdsdsd");
  intent=new Intent(MainActivity.this, localService.class);
   startService(intent);
   System.out.println("sss");
   break;
  case R.id.stop:
   tv.setText("");
   intent=new Intent(MainActivity.this, localService.class);
   stopService(intent);
   System.out.println("sss1");
   break;
  default:
   break;
  }

}

}

和Activity交互的本地服务

public class localService extends Service {
private MyBinder myBinder=new MyBinder();
@Override
public IBinder onBind(Intent intent) {
  System.out.println("IBinder()");
  return myBinder;
}
@Override
public void onCreate() {
  System.out.println("onCreate()");
  super.onCreate();
}
@Override
public void onDestroy() {
  System.out.println("ondestroy");
  super.onDestroy();
}
@Override
public int onStartCommand(Intent intent, int flags, int startId) {
  System.out.println("onstartCommand(0");
  return super.onStartCommand(intent, flags, startId);
}
public void print(){
  System.out.println("Activity与Service连接成功啦");
}

public class MyBinder extends Binder{
  public localService getService(){
   return localService.this;
  }

}

}

public class MainActivity extends Activity implements OnClickListener{
private Button startBtn,stopBtn;
private TextView tv;
Intent intent;
private boolean flag;

@Override
public void onClick(View v) {

  switch (v.getId()) {

  case R.id.start:
   tv.setText("sdsdsdsd");
  intent=new Intent(MainActivity.this, localService.class);
   bindService(intent, conn, Context.BIND_AUTO_CREATE);
   break;
  case R.id.stop:
   tv.setText("");
   if(flag==true){
    unbindService(conn);
    flag=false;
   }
   break;
  default:
   break;
  }

}
private ServiceConnection conn=new ServiceConnection() {

  @Override
  public void onServiceDisconnected(ComponentName name) {
   // TODO Auto-generated method stub

  }

  @Override
  public void onServiceConnected(ComponentName name, IBinder service) {
   MyBinder binder=(MyBinder) service;
   localService bindService=binder.getService();
   bindService.print();
   flag=true;

  }
};

}

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