Question

我的问题是：我有活动A，它启动服务S.A启动另一个应用程序B，它安装在系统中。然后S开始活动B，在这个时刻，B开始，连同A.技术上，A不应该开始，但它确实如此。我对此很困惑。我真的希望有人能帮助我。我花了好几个小时。这是代码：

public class ActivityA extends Activity{

Intent intent;

@Override
public void onCreate(Bundle savedInstanceState){
    super.onCreate(savedInstanceState);
    setContentView(R.layout.test_b);

    intent = new Intent(this, TestService.class);
    //start an app in the system
    AppManager.getAppManager(this).launch(10);
    startService(intent);
}

@Override
public void onDestroy(){
    super.onDestroy();
    stopService(intent);
}

}

public class TestService extends Service{

@Override
public void onCreate(){
    super.onCreate();

    IntentFilter onfilter = new IntentFilter(Intent.ACTION_SCREEN_ON);

    registerReceiver(screenon, onfilter);

}

@Override
public void onDestroy(){
    super.onDestroy();
    unregisterReceiver(screenon);
}

BroadcastReceiver screenon = new BroadcastReceiver() {

    public static final String TAG = "screenon"; 
    public static final String Screen = "android.intent.action.SCREEN_ON";

    @Override
    public void onReceive(Context context, Intent intent) {
        if (!intent.getAction().equals(Screen))
            return;

        //start TestLockActivity when screen on
        Intent it = new Intent(TestService.this, ActivityB.class);
        it.setFlags(Intent.FLAG_ACTIVITY_NEW_TASK);
        startActivity(it);
        return;

    }
};

@Override
public IBinder onBind(Intent intent) {
    // TODO Auto-generated method stub
    return null;
}

}

public class ActivityB extends Activity{

@Override
public void onCreate(Bundle savedInstanceState){
    super.onCreate(savedInstanceState);
    setContentView(R.layout.test_lock);
}
}

AppManager中的

launch（）方法：

public void launch(String activityName)
{
    ResolveInfo info = getResolve(activityName);
    Intent intent = new Intent();
    intent.setComponent(new ComponentName(info.activityInfo.applicationInfo.packageName,
            activityName));
    intent.setFlags(Intent.FLAG_ACTIVITY_NEW_TASK);
    context.startActivity(intent); 

}

public void launch(int idx)
{
    String activityName = getActivityName(idx);
    launch(activityName);
}

Answer 1

这是因为活动B已经附加到正在运行的任务（根植于活动A的任务）。它也在FLAG_ACTIVITY_NEW_TASK的文档中指定：

使用此标志时，如果任务已在您正在运行的活动中运行开始，然后新的活动将不会开始;相反，当前任务将只需将其带到最后一个状态的屏幕前面即可 FLAG_ACTIVITY_MULTIPLE_TASK用于禁用此行为的标志。

来自服务的Android启动活动

1 个答案: