幾個小時前我有這個問題(Android: AsyncTask, my 1st task has not finished when the other starts)我把它解決了,但後來我意識到我有類似的問題。Android:AsyncTask,onPostExecute在doInBackground完成之前啓動
這是我的主類 「GameActivity」
public void mainmethod()
Log.w("GAMEACTIVITY","actionup");
myAsyncRunnable mar = new myAsyncRunnable(GameActivity.this);
mar.execute("fire");
public void doPhotoTask() {
PhotoTask photoTask = new PhotoTask(camera,surfaceCamera,isPreview,holder,GameActivity.this);
photoTask.execute(null);
}
在myAsyncRunnable.fire
()我有一個環而改變gameActivity一個ImageView的> 10倍的圖像。我希望在最後的圖像已經改變 在這裏,在myAsyncRunnable的代碼擴展的AsyncTask
@Override
protected Void doInBackground(String... params) {
fire();
return null;
}
public void fire() {
final ImageView image3 = (ImageView) gameactivity.findViewById(R.id.imageView3);
final int drawables[] = new int[] {R.drawable.fire1,R.drawable.fire2,R.drawable.fire3,R.drawable.fire4,R.drawable.fire5,R.drawable.fire6,R.drawable.fire7,R.drawable.fire8,R.drawable.fire9,R.drawable.fire10,R.drawable.fire11,R.drawable.fire12,R.drawable.fire13,R.drawable.fire14,R.drawable.fire15,R.drawable.fire16};
for (int i=0;i<drawables.length;i++) {
final int j=i;
Runnable runnable = new Runnable() {
@Override
public void run() {
image3.setImageResource(drawables[j]);
Log.w("GAMEACTIVITY","image"+j);
}
};
gameactivity.handler.postDelayed(runnable, 200*j);
}
}
@Override
protected void onPostExecute(Void result) {
Log.w("GAMEACTIVITY","ONPOSTEXECUTE");
gameactivity.doPhotoTask();
}
在PhotoTask
@Override
protected Void doInBackground(Boolean... params) {
camera.takePicture(null,null, myPictureCallback_JPG);
Log.w("GAMEACTIVITY","TAKEPICTURE");
return null;
}
我的日誌貓
02-11 16:03:32.920: W/GAMEACTIVITY(7750): actionup
02-11 16:03:33.010: W/GAMEACTIVITY(7750): image0
02-11 16:03:33.010: W/GAMEACTIVITY(7750): ONPOSTEXECUTE
02-11 16:03:33.030: E/QualcommCameraHardware(99): takePicture(479)
02-11 16:03:33.100: E/QualcommCameraHardware(99): rawsize = 460800 cbcr offset =307200
02-11 16:03:33.110: E/QualcommCameraHardware(99): takePicture: X
02-11 16:03:33.110: W/GAMEACTIVITY(7750): TAKEPICTURE
02-11 16:03:33.120: E/mm-camera(99): camera_ops_start, CAMERA_OPS_CAPTURE_AND_ENCODE mode 1
02-11 16:03:33.350: W/GAMEACTIVITY(7750): image1
02-11 16:03:33.490: W/GAMEACTIVITY(7750): image2
02-11 16:03:33.780: W/GAMEACTIVITY(7750): image3
02-11 16:03:33.880: W/GAMEACTIVITY(7750): image4
02-11 16:03:34.110: W/GAMEACTIVITY(7750): image5
02-11 16:03:34.250: W/GAMEACTIVITY(7750): image6
02-11 16:03:34.490: W/GAMEACTIVITY(7750): image7
02-11 16:03:34.680: W/GAMEACTIVITY(7750): image8
02-11 16:03:34.880: W/GAMEACTIVITY(7750): image9
02-11 16:03:35.050: W/GAMEACTIVITY(7750): image10
02-11 16:03:35.110: E/QualcommCameraHardware(99): receiveRawPicture: E
02-11 16:03:35.280: W/GAMEACTIVITY(7750): image11
02-11 16:03:35.440: W/GAMEACTIVITY(7750): image12
02-11 16:03:35.500: E/QualcommCameraHardware(99): address of Jpeg 0 encoded buf 1085800448 Jpeg Heap base 1085800448
02-11 16:03:35.500: W/GAMEACTIVITY(7750): FIRST
02-11 16:03:36.470: W/GAMEACTIVITY(7750): INTENT
02-11 16:03:36.580: W/GAMEACTIVITY(7750): image13
02-11 16:03:36.710: W/GAMEACTIVITY(7750): image14
02-11 16:03:36.800: W/GAMEACTIVITY(7750): image15
02-11 16:03:37.320: W/GAMEACTIVITY(7750): SURFACEDESTROYED
我有問題。當我寫「gameactivity.handler.postDelayed(runnable,200 * j);」執行該行之後,在doBackground方法中運行200毫秒還是運行在外? – morg 2013-02-11 16:44:12
http://developer.android.com/reference/android/os/Handler.html 看看PostDelayed。 它會在gameactivity線程上運行(不在後臺,如果你正在更新ui,這很好)。 – Raanan 2013-02-11 16:46:42
非常感謝你,我定時另一個runnable做doPhotoTask() – morg 2013-02-11 16:54:49