Develop Reference

Animate change of view background not happening smoothly

I am trying to animate the back ground of my activity
What i have done is
ImageView image = (ImageView) findViewById(R.id.toggle_image);
final TransitionDrawable td = new TransitionDrawable( new Drawable[] {
getResources().getDrawable(R.drawable.welcomeimagetoggle1),
getResources().getDrawable(R.drawable.welcomeimagetoggle2)
});
image .setImageDrawable(td);
td.startTransition(3000);
td.reverseTransition(3000);
final Handler handler = new Handler();
handler.postDelayed(new Runnable() {
#Override
public void run() {
//Do something after 100ms
td.startTransition(3000);
td.reverseTransition(3000);
handler.postDelayed(this, 3000);
}
}, 3000);
It's working properly but the problem is while the timer ends the change happening is to smooth , there is a sudden movement. How can i avoid that ?

I think you should use this library (DexMovingImageView) instead.
It offers some cool transitions (check their demo). In your case, use the DexCrossFadeImageView with multiple images.
Don't forget to make the window background of your activity transparent to avoid overdraw.
UPDATE : About the padding, check the scaletype. As for animation, here's KenBurnsView (ImageView animated by Ken Burns effect), Motion (ImageView with a parallax effect that reacts to the device's tilt) and finally LoyalNativeSlider (An image slider with many cool animations). Hope this helps!

Load part of bitmap in scrollable imageview and load the rest when scrolling?

I'm trying to load in part of a tall image into a scrollable imageview (imageview inside a scrollview).
It works with smaller images but if the images is bigger than 2048x2048 the app will crash due to open gl out of memory.
I can load part of the image with this:
private Bitmap decodeBitmapRegion(InputStream in, Rect region) {
BitmapRegionDecoder decoder = null;
try {
decoder = BitmapRegionDecoder.newInstance(in, false);
} catch (IOException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
region.right = decoder.getWidth();
Bitmap reg = decoder.decodeRegion(region, null);
return reg;
}
Where the rectangle can be something like (0,0,DisplayWidth,800).
That works in most cases since i'm using the imageview to let the user crop a part of the image and save it as a coveriamge.The imageview has the same width as the display and the height of 400 dp.
So the image the user saves will be the same width as the orginal but only 400 dp's tall.
Is there anyway to make it possible for the user to scroll all the way to the bottom of the orginal image?
How does webview load images that are bigger than 2048x2048?

Here's one thought.
Imagine your image broken into rows of bands. Use a ListView to display the bands. A ListView uses an adapter. In adapter.getView(), you use the decoder to load the appropriate band.
The ListView already does "recycling". So, it more-or-less only holds enough rows to fill the screen.
This technique should work well if your images aren't too wide. If they are, and it's not tall enough to occupy more than one screen height, you'll still have the same memory problems. A more complicated solution would be to use some sort of grid view, but then you'll have to do your own view recycling. Not too difficult, but harder than using ListView.

I managed to get the functionality I wanted. But i don't think this is the best solution?
I loaded the image into a webview and then i took a screenshot of the visible part of the webview. After that i can save that bitmap and do whatever i want to it.
But there must be a better way to do this than to use a webview to show the original image?
Anyway here is what I did:
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
button = (Button) findViewById(R.id.button1);
imgView = (ImageView) findViewById(R.id.imageview);
webView = (WebView) findViewById(R.id.webview);
webView.loadUrl("file:///android_asset/test.jpg");
button.setOnClickListener(new OnClickListener() {
#Override
public void onClick(View v) {
imgView.setImageBitmap(getBitmapForVisibleRegion(webView));
}
});
}
public static Bitmap getBitmapForVisibleRegion(WebView webview) {
Bitmap returnedBitmap = null;
webview.setDrawingCacheEnabled(true);
returnedBitmap = Bitmap.createBitmap(webview.getDrawingCache());
webview.setDrawingCacheEnabled(false);
return returnedBitmap;
}

Android Imageview auto scroll with an animation

I have a image(size is 600 * 400) and my imageview size is (300 * 400).
I want load this image and auto scroll from left to right (in 5 seconds) with an animation.
I try to use "scrollto" and timer but It's not very good.
How to smooth scroll this imageview with an animation ?
Thanks very much.

did you try to use Handler?
Handler handler1 = new Handler();
handler1.postDelayed(new Runnable() {
public void run() {
"Your code that be executed after 5 seconds"
}
}, 5000);

animate a image means it become big and small in one place android

hi i want to give animation using only one image in drawable folder means in imageview tag of xml file i increase width and height of same image now i want to animate it in one place
i had the code which uses series of images seved in drawale folder and animate it but i have only 1 image ..pls give any suitable example which uses only 1 image and animate that image using imageview height and width increasing..thanks in adv
below is my code..
final ImageView splashImageView = (ImageView) findViewById(R.id.SplashImageView);
splashImageView.setBackgroundResource(R.drawable.flag);
final AnimationDrawable frameAnimation = (AnimationDrawable)splashImageView.getBackground();
splashImageView.post(new Runnable(){
#Override
public void run() {
frameAnimation.start();
}
});
final SplashScreen sPlashScreen = this;
// The thread to wait for splash screen events
mSplashThread = new Thread(){
#Override
public void run(){
try {
synchronized(this){
// Wait given period of time or exit on touch
wait(5000);
}
}
catch(InterruptedException ex){
}
}
};
mSplashThread.start();
}

Try this:
ScaleAnimation scaler = new ScaleAnimation((float) 0.7, (float) 1.0, (float) 0.7, (float) 1.0);
scaler.setDuration(40);
imageView1.startAnimation(scaler);

"become big and small in one place" usually is called scaling.
I didn't really read it (just googled "android scaling images"), but this forum post might help you out. It seems to have a code tutorial:
http://www.anddev.org/resize_and_rotate_image_-_example-t621.html

Android: how to change a low quality image to the hi quality one when the animation stops in gallery?

I want to do an image gallery like in iphone. I want to show low quality (pre-resized) images and when the image is active I want to process the big image and show the result in the gallery.
I have two questions. How to attach a listener on the animation stop in gallery? And how to access an image after this action?

You can set an AnimationListener on your animation, and override the onAnimationEnd method.
From http://www.roosmaa.net/animation-ended-callback/ :
ImageView viewN = ..;
Animation animN = ...;
Drawable myNewDrawable = ...;
animN.setAnimationListener(new AnimationListener() {
// ...
void onAnimationEnd(Animation anim)
{
//Do your work here.
viewN.setDrawable(myNewDrawable);
return;
}
// ...
});
viewN.startAnimation(animN);