Develop Reference

Android Pause and Resume Background Activity

In one activity of my app, there are an imagview and a textview that are changing every 3 seconds.
I first set this up with a handler and thread runnable. It works fine, but when I use removeCallbacks with the pause button, it will not pause in the middle of the Thread. It completes the Thread runnable before pausing. I need it to pause when the button is clicked no matter where it is in the runnable.
I thought about using an asynctask but I'm not sure how this would work.
I know there has to be a way to do this, as you can pause almost any game you download. Does anyone have any suggestions on the best/easiest way to do this?
Thanks so much!! :)
public class Workout extends AppCompatActivity {
private String[] messages = {"1", "2", "3", "4", "5"};
final Handler handler = new Handler();
private int nextIndex;
String mDrawableName[] = {"bodypart70", "equipment70", "settings70", "time70", "bodypart70"};
private int nextImage;
ImageView image;
private ProgressBar progressBar;
private int progressStatus = 0;
Runnable r = null;
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.workout);
image = (ImageView) findViewById(R.id.exerciseImage);
final TextView text = (TextView)findViewById(R.id.textView4);
progressBar = (ProgressBar) findViewById(R.id.progressBar1);
//changing
r = new Runnable(){
#Override
public void run(){
if (messages.length > nextIndex) {
//change textview
text.setText(messages[nextIndex++]);
//change image
int resID = getResources().getIdentifier(mDrawableName[nextImage++] , "drawable", getPackageName());
image.setImageResource(resID);
//restart progress bar
progressStatus = 0;
progress();
//do it after 3 seconds
handler.postDelayed(this, 3000);
}
}
};
handler.postDelayed(r, 0);
}
public void progress(){
new Thread(new Runnable() {
public void run() {
long timerEnd = System.currentTimeMillis() + 3 * 1000;
while (timerEnd > System.currentTimeMillis()) {
progressStatus = 3 - (int) (timerEnd - System.currentTimeMillis()) / 1000;
// Update the progress bar
handler.post(new Runnable() {
public void run() {
progressBar.setProgress(progressStatus);
}
});
try {
Thread.sleep(10);
} catch (InterruptedException e) {
Log.w("App", "Progress thread cannot sleep");
}
}
}
}).start();
}
public void pauseWorkout(View view){
handler.removeCallbacks(r);
}
public void resumeWorkout(View view){
handler.postDelayed(r, 0);
}
}

It looks like the while-loop in your progress() function is still working after you press your pause button.
Try the following: Create a global boolean that indicates you're in a paused or resuming state. Put it at the top of your code:
boolean resume = true;
Update your while condition in progress()
while (resume && timerEnd > System.currentTimeMillis()) {
Update your workout functions:
public void pauseWorkout(View view){
handler.removeCallbacks(r);
resume = false;
}
public void resumeWorkout(View view){
handler.postDelayed(r, 0);
resume = true;
}

How to stop images animation?

The following program displays full screen images that animate automatically by using the loadAnimation() method. Here is is the code.
public class MainActivity extends ActionBarActivity {
/** Called when the activity is first created. */
public int currentimageindex=0;
Timer timer;
TimerTask task;
ImageView slidingimage;
private int[] IMAGE_IDS = {
R.drawable.picture1, R.drawable.picture2, R.drawable.picture3,
R.drawable.picture4
};
#Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
final Handler mHandler = new Handler();
// Create runnable for posting
final Runnable mUpdateResults = new Runnable() {
public void run() {
AnimateandSlideShow();
}
};
int delay = 1000; // delay for 1 sec.
int period = 3000; // repeat every 4 sec.
Timer timer = new Timer();
timer.scheduleAtFixedRate(new TimerTask() {
public void run() {
mHandler.post(mUpdateResults);
}
}, delay, period);
}
/**
* Helper method to start the animation on the splash screen
*/
private void AnimateandSlideShow() {
slidingimage = (ImageView)findViewById(R.id.ImageView3_Left);
slidingimage.setImageResource(IMAGE_IDS[currentimageindex%IMAGE_IDS.length]);
currentimageindex++;
Animation leftToRight = AnimationUtils.loadAnimation(this, R.anim.left_to_right);
slidingimage.startAnimation(leftToRight);
}
}
As you can see the full sized picture change every 4 seconds. Now what i want to do is to stop the animation after the appearance of the last image(picture 4 in this case). After fixing this,I will try fetch images from a server using JSON.
Thank you,
Theo.

1)You have to load animation until only you have image in IMAGE_IDS array
2)Then stop your timer also
Add following lines in AnimateandSlideShow() below currentimageindex++
if(currentimageindex <= IMAGE_IDS.length)
{
Animation leftToRight = AnimationUtils.loadAnimation(this, R.anim.letf_anim);
slidingimage.startAnimation(leftToRight);
}
else
{
timer.cancel();
}
Also replace following line
Timer timer = new Timer();
To
timer = new Timer();

How to close the application after animation?

Hi i'm running an animation and after 2 seconds i want to stop it and close the whole application.
This is my animation:
public void onImageButtonOkClick(View view) {
setContentView(R.layout.success);
final ImageView mAnimLogo = (ImageView) findViewById(R.id.loading_image);
final AnimationDrawable mAnimation = (AnimationDrawable) mAnimLogo.getDrawable();
mAnimLogo.post(new Runnable() {
#Override
public void run() {
mAnimLogo.setVisibility(View.VISIBLE);
mAnimation.start();
}
});
}
and i tried to use finish() after a timer was called - the application closed, but without any animations.
Any Suggestions?
Edit:
public void delay() {
Timer timer = new Timer();
try {
synchronized(timer){
timer.wait(2000);
getParent().finish();
}
} catch (InterruptedException e) {
e.printStackTrace();
}
}

i solved this problem by using a recursive function to check the animation
private void checkAnimation(AnimationDrawable animationDrawable){
final AnimationDrawable animation = animationDrawable;
int timeBetweenChecks = 300;
Handler h = new Handler();
h.postDelayed(new Runnable(){
public void run(){
if (animation.getCurrent() != animation.getFrame(animation.getNumberOfFrames() - 1)){
checkAnimation(animation);
} else{
finish();
}
}
}, timeBetweenChecks);
};

how to check if an application is killed during an animation in android

i have to make an application in which it starts with an animation and if we click the back button then it should return back to application manager.But what i have made in it if u click back button during that animation then it goes to application manager but after a second or two the first page(the one after this animation comes up).
Can anyone help??
This is the animation..
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.load);
im = (ImageView) findViewById(R.id.load_icon);
rotate = AnimationUtils.loadAnimation(getApplicationContext(),
R.anim.load_page);
rotate.setInterpolator(new LinearInterpolator());
im.startAnimation(rotate);
new Handler().postDelayed(new Runnable() {
#Override
public void run() {
Intent nextPageIntent = new Intent(getApplicationContext(),
P1.class);
startActivity(nextPageIntent);
}
}, 3000);
}

The first page opens because you have added
new Handler().postDelayed(new Runnable() {
#Override
public void run() {
Intent nextPageIntent = new Intent(getApplicationContext(),
P1.class);
startActivity(nextPageIntent);
}
}, 3000);
This launches the activity.For knowing if the animation has stopped use AnimationListener. More details here about animation listener
Android, How to set animation listener for view group?

You just added animation to one image view thats all, you do not doing anything with animation. The problem is, you started one thread to start activity P1 after 3 seconds. That thread only starting P1 activity. Try this and try to avoid killProcess(),
public class LauncherActivity extends Activity {
private Handler mHandler;
private Runnable mRunnable;
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_launcher);
mHandler = new Handler();
mRunnable = new Runnable() {
#Override
public void run() {
Intent nextPageIntent = new Intent(getApplicationContext(),
XmlParserActivity.class);
startActivity(nextPageIntent);
}
};
mHandler.postDelayed(mRunnable, 3000);
}
/* #Override
public void onBackPressed() {
super.onBackPressed();
mHandler.removeCallbacks(mRunnable);
}*/
#Override
protected void onDestroy() {
super.onDestroy();
mHandler.removeCallbacks(mRunnable);
}
}

public void onBackPressed() {
android.os.Process.killProcess(android.os.Process.myPid());
}
This is the answer

Animation, delay

I would like to make an animation, I have 10 images of a ball and I want to do:
Image1 visible, all the other images hidden
Image2 visible all the other images hidden
...
Image10 visible all the other images hidden
Should I do that in one animation (how?) or should I create a java method showImage(String pathimage) which would show the image located at pathimage and hide the others? Could I put any idea of time delay with using
handler.postDelayed(new Runnable() {
public void run() { }
}
EDIT, here is my code
The problem is that run() is always called in what seems to be an infinite loop. But I don't see where is my error
GAMEACTIVITY
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
.....
ImageView image2 = (ImageView) findViewById(R.id.imageView3);
image2.setOnTouchListener(new OnTouchListener(){
#Override
public boolean onTouch(View arg0, MotionEvent arg1) {
myAsyncRunnable mar = new myAsyncRunnable(GameActivity.this);
mar.execute(null);
PhotoTask photoTask = new PhotoTask(camera,surfaceCamera,isPreview,holder,GameActivity.this);
photoTask.execute(null);
Log.w("GAMEACTIVITY","PHOTOTASK");
return false;
}
});
}
My Async Task
public class myAsyncRunnable extends AsyncTask<Void, Boolean, Void> {
GameActivity gameactivity;
#Override
protected Void doInBackground(Void... params) {
pull();
return null;
}
public myAsyncRunnable(GameActivity gameactivity) {
super();
this.gameactivity = gameactivity;
}
public void pull() {
final ImageView image3 = (ImageView) gameactivity.findViewById(R.id.imageView3);
final int drawables[] = new int[] {R.drawable.pull2,R.drawable.pull3,R.drawable.pull4,R.drawable.pull5,R.drawable.pull6,R.drawable.pull7};
Runnable runnable = new Runnable() {
#Override
public void run() {
for (int i=0;i<drawables.length;i++) {
image3.setImageResource(drawables[i]);
gameactivity.handler.postDelayed(this, 500);
Log.w("asyncrunnable","run"+i);
}
}
};
gameactivity.handler.post(runnable);
}
}

You should not create 10 ImageViews to do such animation.
Only one ImageView should suffice! Use a handler to update the Image using any flavor of setImage every x milliseconds or so.
Initialize the images in an array and the current image in an integer :
int drawables[] = new int[] {R.drawable.image1, R.drawable.image2, ...};
int mCurrent = 0;
Then initialize your updater:
Runnable runnable = new Runnable() {
#Override
public void run() {
if(mCurrent>=drawables.length)mCurrent=0;
imageView.setImageResource(drawables[mCurrent]);
mHandler.postDelayed(this, 3000); //every 3 seconds
}
};
Finally when you want to start, just post the runnable:
mHandler.post(runnable);
Your code is wrong:
Try this pull function (although i do not really approve the whole code style but no time to fix that)
public void pull() {
final ImageView image3 = (ImageView) gameactivity.findViewById(R.id.imageView3);
final int drawables[] = new int[] {R.drawable.pull2,R.drawable.pull3,R.drawable.pull4,R.drawable.pull5,R.drawable.pull6,R.drawable.pull7};
for (int i=0;i<drawables.length;i++) {
final int j = i;
Runnable runnable = new Runnable() {
#Override
public void run() {
image3.setImageResource(drawables[j]);
}
};
gameactivity.handler.postDelayed(this, 500 * i);
Log.w("asyncrunnable","run"+i);
}
}
}