java 从服务启动活动不起作用（android）

Start activity from service isn't working (android)

提问by Pedro Fraga

I created an overlay "always on top button", wich is a service HUD, and I can't start an activity screenfrom there, it gives the error: "Unfortunately App has stopped". In the begining, all I used to know if there was any TouchEventwas a toast, and that toast was created, but it was created severall times, so I don't know if it gives that error because this code, wich is on TouchEventbody , is repeated severall times too. here is my code:

我创建了一个“始终在顶部按钮上”的叠加层，这是一项服务HUD，我无法screen从那里开始活动，它给出了错误："Unfortunately App has stopped"。一开始，我只知道是否有TouchEvent一个吐司，那个吐司被创建了，但它被创建了好几次，所以我不知道它是否会给出那个错误，因为这段代码，在TouchEventbody 上，也重复了几次。这是我的代码：

public class HUD extends Service implements OnClickListener, OnTouchListener, OnLongClickListener {
Button mButton;
@Override
public IBinder onBind(Intent intent) {
    return null;
}

@Override
public void onCreate() {
    super.onCreate();
    //mView = new HUDView(this);


    mButton = new Button(this);
    mButton.setId(1);
    mButton.setText("Button");
    mButton.setClickable(true);
    mButton.setOnTouchListener(this);


    WindowManager.LayoutParams params = new WindowManager.LayoutParams(
            WindowManager.LayoutParams.WRAP_CONTENT,
                    WindowManager.LayoutParams.WRAP_CONTENT,
                    WindowManager.LayoutParams.TYPE_PHONE,
                    WindowManager.LayoutParams.FLAG_NOT_TOUCH_MODAL |
                    WindowManager.LayoutParams.FLAG_NOT_FOCUSABLE, 
                    PixelFormat.OPAQUE);

    params.gravity = Gravity.LEFT | Gravity.TOP;
    params.setTitle("Load Average");
    WindowManager wm = (WindowManager) getSystemService(WINDOW_SERVICE);
    wm.addView(mButton, params);


}

@Override
public void onDestroy() {
    super.onDestroy();
    if(mButton != null)
    {
        ((WindowManager) getSystemService(WINDOW_SERVICE)).removeView(mButton);
        mButton = null;
    }
}

@Override
public boolean onTouch(View v, MotionEvent event) {
    if(event.getX()<mButton.getWidth() & event.getY()>0)
    {
    Toast.makeText(this,"Overlay button event", Toast.LENGTH_SHORT).show(); //this my toast
    Intent i = new Intent();                                                //this is my new acivity (intent)
    i.setClass(HUD.this, screen.class);
    i.setFlags(Intent.FLAG_ACTIVITY_NEW_TASK);
    startActivity(i);
    HUD.this.stopSelf();
    }
    return false;
}


@Override
public void onClick(DialogInterface dialog, int which) {
    // TODO Auto-generated method stub
    Toast.makeText(this,"Click", Toast.LENGTH_SHORT).show();
}

@Override
public boolean onLongClick(View v) {
    // TODO Auto-generated method stub
    System.exit(1);
    return false;
}

}

So my question is, is this code on TouchEventbody being repeated severall times? If it is, is that the cause of the error? thank you.

所以我的问题是，TouchEvent身体上的这段代码是否被重复了几次？如果是，这是错误的原因吗？谢谢。

log cat:

日志猫：

07-20 22:11:06.962: I/Choreographer(1620): Skipped 52 frames!  The application may be doing too much work on      its main thread.
07-20 22:11:08.062: D/AndroidRuntime(1620): Shutting down VM
07-20 22:11:08.062: W/dalvikvm(1620): threadid=1: thread exiting with uncaught exception (group=0x40a71930)
07-20 22:11:08.132: E/AndroidRuntime(1620): FATAL EXCEPTION: main
07-20 22:11:08.132: E/AndroidRuntime(1620): android.app.SuperNotCalledException: Activity    {com.example.screenshot/com.example.screenshot.screen} did not call through to super.onCreate()
07-20 22:11:08.132: E/AndroidRuntime(1620):     at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2146)
07-20 22:11:08.132: E/AndroidRuntime(1620):     at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2230)
07-20 22:11:08.132: E/AndroidRuntime(1620):     at android.app.ActivityThread.access0(ActivityThread.java:141)
07-20 22:11:08.132: E/AndroidRuntime(1620):     at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1234)
07-20 22:11:08.132: E/AndroidRuntime(1620):     at android.os.Handler.dispatchMessage(Handler.java:99)
07-20 22:11:08.132: E/AndroidRuntime(1620):     at android.os.Looper.loop(Looper.java:137)
07-20 22:11:08.132: E/AndroidRuntime(1620):     at android.app.ActivityThread.main(ActivityThread.java:5041)
07-20 22:11:08.132: E/AndroidRuntime(1620):     at java.lang.reflect.Method.invokeNative(Native Method)
07-20 22:11:08.132: E/AndroidRuntime(1620):     at java.lang.reflect.Method.invoke(Method.java:511)
07-20 22:11:08.132: E/AndroidRuntime(1620):     at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:793)
07-20 22:11:08.132: E/AndroidRuntime(1620):     at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:560)
07-20 22:11:08.132: E/AndroidRuntime(1620):     at dalvik.system.NativeStart.main(Native Method)

screen.java:

屏幕.java：

public class screen extends Activity {

@Override
public void onCreate(Bundle savedInstanceState) {
Toast.makeText(getApplicationContext(), "Made it", 0).show();
finish();
}
}

回答by Shobhit Puri

See android start activity from service

从服务中查看android 启动活动

Intent i= new Intent(getBaseContext(), screen.class);
i.addFlags(Intent.FLAG_ACTIVITY_NEW_TASK);
getApplication().startActivity(i);

You error seems to be inside screenactivity. There are many thread which might help to figure out the error that you are getting for the activity:

你的错误似乎是在screen活动中。有许多线程可能有助于找出您在活动中遇到的错误：

Error in Android "SuperNotCalledException:Activity did not call through to super.OnCreate()"

Android 中的错误“SuperNotCalledException：Activity 没有调用 super.OnCreate()”

android.app.SuperNotCalledException: Activity did not call through to super.onStop()

android.app.SuperNotCalledException：Activity 没有调用 super.onStop()

Update

更新

The error is because you haven't called: super.onCreate(savedInstanceState);in your screenactivity's onCreate(). That should be the first thing to be called in onCreate(). Do something like this:

错误是因为您没有super.onCreate(savedInstanceState);在您的screen活动的onCreate(). 这应该是第一个被调用的东西onCreate()。做这样的事情：

public void onCreate(Bundle savedInstanceState) {
  super.onCreate(savedInstanceState);
  //.... other stuff
}

Hope this helps.

希望这可以帮助。