android - 为什么不调用 onStart？

Question

我正在尝试实现一个非常简单的服务示例。用户通过 EditText 输入值并单击计算按钮。 Calculate 按钮触发一个服务，该服务执行一些计算并将结果发送回另一个 EditText 框。如果我使用没有绑定(bind)的简单服务，结果会在执行计算之前显示，所以我想使用绑定(bind)服务。但在我的例子中，控件只是在 onBind 调用处停止并且 onStart 没有被执行。不过，控件确实流向了 onCreate。谁能帮我找到我要去哪里错了？

public class SimpleService extends Service {
    private final IBinder mBinder = new LocalBinder();


    @Override
    public IBinder onBind(Intent intent) {
        // TODO Auto-generated method stub
        System.out.println("Service: OnBind");
         return mBinder;
    }

    public class LocalBinder extends Binder {

        SimpleService getService() {
            System.out.println("Service: in Local binder");

            return SimpleService.this;
        }
    }

    @Override
    public void onCreate() {
        super.onCreate();
        System.out.println(" Service:In on create...");
        Toast.makeText(this,"Service created ...",         Toast.LENGTH_LONG).show()
    }

    @Override
    public void onDestroy() {
       super.onDestroy();
       System.out.println(" Service:in on destroy...");

       Toast.makeText(this, "Service destroyed ...", Toast.LENGTH_LONG).show();
    }

@Override
public void onStart(Intent intent, int startid) {
  System.out.println("Service:in onstart command ...");
  super.onStart(intent, startid);
  int res;
  String LOG_TAG =  "";
  int input2 = intent.getIntExtra("input", -1);
  int mode = intent.getIntExtra("mode", -1);
  String aString = Integer.toString(mode);
  Log.v(LOG_TAG, aString);
  if(mode == 1) {
         res = cal_F(input2);
    } else {
         res = cal_C(input2);
    }

  intent.putExtra("result", res);
     }

    }

#

public class ClassExamplesServiceActivity extends Activity implements  OnClickListener{

@Override
public void onClick(View v) {

    input = Integer.parseInt(input1.getText().toString());
    if(v.getId() == R.id.radio_fib)
        rd_button = 0;
    else if(v.getId() == R.id.radio_fact)
        rd_button = 1;
    else if (v.getId() == R.id.button1){

        intent = new Intent(this, SimpleService.class);
        intent.putExtra("input", input);
        intent.putExtra("mode", rd_button);
        doBindService();
        System.out.println("in class activity "+System.currentTimeMillis());

    }       

    else if(v.getId() == R.id.stop)
    {
        stopService(intent);
    }     
}

private ServiceConnection mConnection = new ServiceConnection() {

    public void onServiceConnected(ComponentName className, IBinder service) {
        System.out.println("\n in service connection");
        mBoundService = ((SimpleService.LocalBinder)service).getService();  
    }



public void onServiceDisconnected(ComponentName className) {
      System.out.println("\n in service disconnected");
      mBoundService = null;
  }
};

void doBindService() {
    System.out.println("in do bind service");

    boolean isConnected = bindService(new Intent(ClassExamplesServiceActivity.this, SimpleService.class), mConnection, Context.BIND_AUTO_CREATE);
    intent.putExtra("input", input);
    intent.putExtra("mode", rd_button);
    System.out.println("\n isconnected = "+ isConnected);
    mIsBound = true;
}
void doUnbindService() {
    if (mIsBound) {
        res = intent.getIntExtra("result", -1);
        result.setText(Integer.toString(res));// Set the result in the EditText
        // Detach our existing connection.
        unbindService(mConnection);
        mIsBound = false;
    }
}

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

#

<application
    android:icon="@drawable/ic_launcher"
    android:label="@string/app_name" >
    <activity
        android:label="@string/app_name"
        android:name=".ClassExamplesServiceActivity" >
        <intent-filter >
            <action android:name="android.intent.action.MAIN" />

            <category android:name="android.intent.category.LAUNCHER" />
        </intent-filter>
    </activity>
    <service android:name=".SimpleService"></service>
</application>

Answer 1

您需要调用 Context.startService() 才能使用 onStart(): http://developer.android.com/reference/android/content/Context.html#startService(android.content.Intent )