本文目录 ⌄
Service(一)
创建一个Service如同创建其它三大组件一样，需要在Manifests中声明之。
启动服务：
@Overrideprotected void onStart() { super.onStart(); Log.i(TAG, "onStart: activity"); Intent intent=new Intent(this,MyService.class); this.startService(intent);}关停服务：
@Overrideprotected void onStop() { super.onStop(); Log.i(TAG, "onStop: activity"); Intent intent=new Intent(this,MyService.class); this.stopService(intent);}在Service内部关停服务：
@Overridepublic int onStartCommand(Intent intent, int flags, int startId) { Log.i("hello","onStartCommand: Service"); stopSelf(); return super.onStartCommand(intent, flags, startId);}使用具有生命周期的LifeCycleService：
添加依赖
implementation "android.arch.lifecycle:extensions:1.1.1"java不支持协程。
绑定服务
在Service中增加继承Binder的子类，并重写OnBind方法：
public class MyService extends LifecycleService {
private MutableLiveData<Integer> number=new MutableLiveData<>();
public MyService() {
number.setValue(0);
}
@Override
public IBinder onBind(Intent intent) {
// TODO: Return the communication channel to the service.
super.onBind(intent);
new Thread(new Runnable() {
@Override
public void run() {
while (true){
try {
Thread.sleep(1000);
} catch (InterruptedException e) {
e.printStackTrace();
}
number.postValue(number.getValue()+1);
}
}
}).start();
return new MyBinder();
}
public class MyBinder extends Binder{
MyService service=MyService.this;
}
public MutableLiveData<Integer> getNumber() {
return number;
}
}在Activity中启动绑定：
buttonBind.setOnClickListener(new View.OnClickListener() { @Override public void onClick(View view) { Log.i(TAG,"onclick"); Intent bindIntent=new Intent(MainActivity.this,MyService.class); ServiceConnection connection=new ServiceConnection() { @Override public void onServiceConnected(ComponentName componentName, IBinder iBinder) { ((MyService.MyBinder)iBinder).service.getNumber().observe(MainActivity.this, new Observer<Integer>() { @Override public void onChanged(Integer integer) { textView.setText(integer.toString()); } }); } @Override public void onServiceDisconnected(ComponentName componentName) { } }; bindService(bindIntent,connection,BIND_AUTO_CREATE); }});