Develop Reference

Android - Trying to display bitmaps efficiently for wallpaper app which are currently 0.5MB in size each

Updated
I'm trying to display bitmaps efficiently for a wallpaper app which holds 50 wallpapers.
The images I'm using are each 400kb # 1080x1920
I've researched and read I should load a scaled down version of each wallpaper into memory when the app loads instead of loading each wallpaper when it is pressed.
I've read this http://developer.android.com/training/displaying-bitmaps/load-bitmap.html#read-bitmap
How would I implement this using my current code? I've got here from this tutorial on YouTube http://www.youtube.com/watch?v=SxGYGYBFrOM
Here is the updated code, ive included the whole of my MainActivity class
package com.example.ultimateabstractwallpaperhd;
import java.io.IOException;
public class MainActivity extends Activity implements OnClickListener {
// Two classes you mentioned I put here.
ImageView display;
int toPhone;
#Override
protected void onCreate(Bundle savedInstanceState) {
// TODO Auto-generated method stub
super.onCreate(savedInstanceState);
// check if next two lines are necessary
requestWindowFeature(Window.FEATURE_NO_TITLE); // gets rid of app title
getWindow().setFlags(WindowManager.LayoutParams.FLAG_FULLSCREEN, WindowManager.LayoutParams.FLAG_FULLSCREEN);
if (android.os.Build.VERSION.SDK_INT>=11) {
getWindow().setFlags(
WindowManager.LayoutParams.FLAG_HARDWARE_ACCELERATED,
WindowManager.LayoutParams.FLAG_HARDWARE_ACCELERATED);
}
setContentView(R.layout.wallpaper);
toPhone = R.drawable.one;
display = (ImageView) findViewById(R.id.IVdisplay);
ImageView one = (ImageView) findViewById(R.id.IVimage1);
ImageView two = (ImageView) findViewById(R.id.IVimage2);
ImageView three = (ImageView) findViewById(R.id.IVimage3);
ImageView four = (ImageView) findViewById(R.id.IVimage4);
ImageView five = (ImageView) findViewById(R.id.IVimage5);
Button setWall = (Button) findViewById(R.id.BsetWallpaper);
one.setOnClickListener(this);
two.setOnClickListener(this);
three.setOnClickListener(this);
four.setOnClickListener(this);
five.setOnClickListener(this);
setWall.setOnClickListener(this);
}
#Override
public void onClick(View v) {
// TODO Auto-generated method stub
switch (v.getId()){
case R.id.IVimage1:
display.setImageResource(R.drawable.one);
toPhone = R.drawable.one;
break;
case R.id.IVimage2:
display.setImageResource(R.drawable.two);
toPhone = R.drawable.two;
break;
case R.id.IVimage3:
display.setImageResource(R.drawable.three);
toPhone = R.drawable.three;
break;
case R.id.IVimage4:
display.setImageResource(R.drawable.four);
toPhone = R.drawable.four;
break;
case R.id.IVimage5:
display.setImageResource(R.drawable.five);
toPhone = R.drawable.five;
break;
case R.id.BsetWallpaper:
InputStream yeaaaa = getResources().openRawResource(toPhone);
Bitmap whatever = decodeSampledBitmapFromResource(getResources(), R.id.IVimage1, 1080, 1500)
try {
getApplicationContext().setWallpaper(whatever);
}catch(IOException e){
e.printStackTrace();
}
break;
}
}
}
EDIT:
Ok, my resources are in the drawable-hpdi folder.
I've still got a few errors, which eclipse has flagged. I've put them in bold.
1)
public static Bitmap decodeSampledBitmapFromResource(**Resources** res, int resId,
int reqWidth, int reqHeight) {
Eclipse explanation: Says resource cannot be resolved into a type
2)
int resId = getResources().**getIdentifier**(R.drawable.one, "drawable", getPackageName());
Bitmap whatever = **decodeSampledBitmapFromResource**(getResources(), R.id.IVimage1, 1080, 1500);
Eclipse explanation:
Method getIdentifier not applicable for arguments list (Sorry if I've simple referenced the drawable incorrectly)
Method decodeSampledBitmapFromResource from the type MainActivity refers to the missing type resources.
Thanks so much for your help so far, it's fantastic to get such quick responses.
EDIT
Name of resource/s: Multiple Resources, named one, two, three, four, five, all with jpg extensions.
Location of resource/s:
res/drawable-hdpi/one.jpg
res/drawable-hdpi/two.jpg
..
res/drawable-hdpi/two.jpg

alternate answer:
InputStream yeaaaa = getResources().openRawResource(toPhone)
final BitmapFactory.Options options = new BitmapFactory.Options();
options.inSampleSize = 2; \\1 would be the full resolution, 2 is half the size, 4 a quarter etc..
Bitmap whatever = BitmapFactory.decodeStream(inputStream, null, options);

So if you look at the documention you mentioned, you want to create these 2 methods in your class:
public static int calculateInSampleSize(
BitmapFactory.Options options, int reqWidth, int reqHeight) {
// Raw height and width of image
final int height = options.outHeight;
final int width = options.outWidth;
int inSampleSize = 1;
if (height > reqHeight || width > reqWidth) {
final int halfHeight = height / 2;
final int halfWidth = width / 2;
// Calculate the largest inSampleSize value that is a power of 2 and keeps both
// height and width larger than the requested height and width.
while ((halfHeight / inSampleSize) > reqHeight
&& (halfWidth / inSampleSize) > reqWidth) {
inSampleSize *= 2;
}
}
return inSampleSize;
}
public static Bitmap decodeSampledBitmapFromResource(Resources res, int resId,
int reqWidth, int reqHeight) {
// First decode with inJustDecodeBounds=true to check dimensions
final BitmapFactory.Options options = new BitmapFactory.Options();
options.inJustDecodeBounds = true;
BitmapFactory.decodeResource(res, resId, options);
// Calculate inSampleSize
options.inSampleSize = calculateInSampleSize(options, reqWidth, reqHeight);
// Decode bitmap with inSampleSize set
options.inJustDecodeBounds = false;
return BitmapFactory.decodeResource(res, resId, options);
}
then instead of :
Bitmap whatever = BitmapFactory.decodeStream(yeaaaa);
use
Bitmap whatever = decodeSampledBitmapFromResource(getResources(), resourceID, width, height)
don't put the resource in raw put it in your drawables folder so you can use the resource ID
you can get the resourceID like so:
getResources().getIdentifier([what ever your named your drawable] , "drawable", getPackageName());
EDIT
per your ajusted code a few things to take note of..
it looks like you are passing the ImageView not the actual resource of a Bitmap..
this line:
Bitmap whatever = decodeSampledBitmapFromResource(getResources(), R.id.IVimage1, 1080, 1500)
should be:
int resId = getResources().getIdentifier([what ever your named your drawable] , "drawable", getPackageName());
Bitmap whatever = decodeSampledBitmapFromResource(getResources(), resId, 1080, 1500)

Android memory handling with Bitmap in Xamarin.Android

Fellow developer, i seek your help.
I have a problem which is memory related. I don't really know how to tackle this so i will just present my code snippets. Bear in mind that, although it is on Xamarin.Android, it will also apply to normal Android.
I use a library which just starts a camera intent. The library (or component) i am using is : http://components.xamarin.com/view/xamarin.mobile. That is not really relevant, but maybe you can point me to other insights why i should or shouldn't be using this library.
Anyway, to start the camera and capture the input. I use the following code :
private void StartCamera() {
var picker = new MediaPicker (this);
if (! picker.IsCameraAvailable) {
Toast.MakeText (this, "No available camera found!", ToastLength.Short).Show ();
} else {
var intent = picker.GetTakePhotoUI (new StoreCameraMediaOptions{
Name = "photo.jpg",
Directory = "photos"
});
StartActivityForResult (intent, 1);
}
}
The onActivityForResult() method is called when i return from this camera intent. In this method, i do the following :
protected override async void OnActivityResult (int requestCode, Result resultCode, Intent data)
{
// User canceled
if (resultCode == Result.Canceled)
return;
System.GC.Collect ();
dialog = new ProgressDialog (this);
dialog.SetProgressStyle (ProgressDialogStyle.Spinner);
dialog.SetIconAttribute (Android.Resource.Attribute.DialogIcon);
dialog.SetTitle (Resources.GetString(Resource.String.dialog_picture_sending_title));
dialog.SetMessage (Resources.GetString(Resource.String.dialog_picture_sending_text));
dialog.SetCanceledOnTouchOutside (false);
dialog.SetCancelable (false);
dialog.Show ();
MediaFile file = await data.GetMediaFileExtraAsync (this);
await ConvertingAndSendingTask ( file );
dialog.Hide();
await SetupView ();
}
Then, in my ConvertingAndSendingTask() i convert the picture into the desired dimensions with a scaled bitmap. The code is as follows :
public async Task ConvertingAndSendingTask(MediaFile file) {
try{
System.GC.Collect();
int targetW = 1600;
int targetH = 1200;
BitmapFactory.Options options = new BitmapFactory.Options();
options.InJustDecodeBounds = true;
Bitmap b = BitmapFactory.DecodeFile (file.Path, options);
int photoW = options.OutWidth;
int photoH = options.OutHeight;
int scaleFactor = Math.Min(photoW/targetW, photoH/targetH);
options.InJustDecodeBounds = false;
options.InSampleSize = scaleFactor;
options.InPurgeable = true;
Bitmap bitmap = BitmapFactory.DecodeFile(file.Path, options);
float resizeFactor = CalculateInSampleSize (options, 1600, 1200);
Bitmap bit = Bitmap.CreateScaledBitmap(bitmap, (int)(bitmap.Width/resizeFactor),(int)(bitmap.Height/resizeFactor), false);
bitmap.Recycle();
System.GC.Collect();
byte[] data = BitmapToBytes(bit);
bit.Recycle();
System.GC.Collect();
await app.api.SendPhoto (data, app.ChosenAlbum.foreign_id);
bitmap.Recycle();
System.GC.Collect();
} catch(Exception e) {
System.Diagnostics.Debug.WriteLine (e.StackTrace);
}
}
Well, this method sends it good on newer devices with more memory but on lower end devices it ends up in a Out of memory error. Or anyway a nearly OOM. When Somethimes i goes well but when i want to take the second or third picture, it always ends up in OOM errors.
I realize that what i am doing is memory intensive. For example :
First i want the initial Width and Height of the original image.
Then it is sampled down (i don't really know if it is done well).
Then i load the sampled Bitmap into the memory.
When i loaded it into memory, my scaled bitmap has to be loaded in memory aswell prior to Recycle() the first Bitmap.
Ultimately i need a byte[] for sending the Bitmap over the web. But i need to convert it first prior to releasing my scaled Bitmap.
Then i release my scaled Bitmap and send the byte[].
Then as a final step, the byte[] needs to be released from memory aswell. I already do that on my BitmapToBytes() method as shown below, but i wanted to include it for maybe other insights.
static byte[] BitmapToBytes(Bitmap bitmap) {
byte[] data = new byte[0];
using (MemoryStream stream = new MemoryStream ())
{
bitmap.Compress (Bitmap.CompressFormat.Jpeg, 90, stream);
stream.Close ();
data = stream.ToArray ();
}
return data;
}
Does somebody sees any good parts where i can optimize this process? I know i am loading to much into memory but i can't think of another way.
It should be mentioned that i always want my images to be 1600x1200(Landscape) or 1200x1600(Portrait). I calculate that value in the following way :
public static float CalculateInSampleSize(BitmapFactory.Options options,
int reqWidth, int reqHeight) {
// Raw height and width of image
int height = options.OutHeight;
int width = options.OutWidth;
float inSampleSize = 1;
if (height > reqHeight || width > reqWidth) {
// Calculate ratios of height and width to requested height and
// width
float heightRatio = ((float) height / (float) reqHeight);
float widthRatio = ((float) width / (float) reqWidth);
// Choose the smallest ratio as inSampleSize value, this will
// guarantee
// a final image with both dimensions larger than or equal to the
// requested height and width.
inSampleSize = heightRatio < widthRatio ? heightRatio : widthRatio;
}
if(height < reqHeight || width < reqWidth) {
// Calculate ratios of height and width to requested height and
// width
float heightRatio = ((float) reqHeight / (float) height);
float widthRatio = ((float) reqWidth / (float) width);
// Choose the smallest ratio as inSampleSize value, this will
// guarantee
// a final image with both dimensions larger than or equal to the
// requested height and width.
inSampleSize = heightRatio < widthRatio ? heightRatio : widthRatio;
}
return inSampleSize;
}
Does anybody has any recommendations or an alternative workflow?
I would be so much helped with this!

This might be a very delayed reply but may helpful to somebody who got the same issue.
Use the the calculated InSampleSize value (option)to decode file to
bitmap. this itself generates the scaled down bitmap instead of using in CreateScaledBitmap.
If you are expecting High resolution image as output then it is
difficult to handle OutOfMemory issue. Because An image with a higher
resolution does not provide any visible benefit, but still takes up
precious memory and incurs additional performance overhead due to
additional scaling performed by the view.[xamarin doc]
Calculate the bitmap target width and height relating to the imageview height and width. you can calculate this by MeasuredHeight and MeasuredWidth Property. [Note: This works only after complete image draw]
Consider using async method to decode file instead running on main thread [DecodeFileAsync]
For more detail follow this http://appliedcodelog.blogspot.in/2015/07/avoiding-imagebitmap.html

Android : Maximum allowed width & height of bitmap

Im creating an app that needs to decode large images to bitmaps to be displayed in a ImageView.
If i just try to decode them straight to a bitmap i get the following error
" Bitmap too large to be uploaded into a texture (1944x2592, max=2048x2048)"
So to be able to show images with too high resolution im using:
Bitmap bitmap = BitmapFactory.decodeFile(path);
if(bitmap.getHeight()>=2048||bitmap.getWidth()>=2048){
DisplayMetrics metrics = new DisplayMetrics();
getWindowManager().getDefaultDisplay().getMetrics(metrics);
int width = metrics.widthPixels;
int height = metrics.heightPixels;
bitmap =Bitmap.createScaledBitmap(bitmap, width, height, true);
}
This works but I don't really want to hardcode the maximum value of 2048 as I have in the if-statement now, but I cant find out how to get a the max allowed size of the bitmap for a device
Any ideas?

Another way of getting the maximum allowed size would be to loop through all EGL10 configurations and keep track of the largest size.
public static int getMaxTextureSize() {
// Safe minimum default size
final int IMAGE_MAX_BITMAP_DIMENSION = 2048;
// Get EGL Display
EGL10 egl = (EGL10) EGLContext.getEGL();
EGLDisplay display = egl.eglGetDisplay(EGL10.EGL_DEFAULT_DISPLAY);
// Initialise
int[] version = new int[2];
egl.eglInitialize(display, version);
// Query total number of configurations
int[] totalConfigurations = new int[1];
egl.eglGetConfigs(display, null, 0, totalConfigurations);
// Query actual list configurations
EGLConfig[] configurationsList = new EGLConfig[totalConfigurations[0]];
egl.eglGetConfigs(display, configurationsList, totalConfigurations[0], totalConfigurations);
int[] textureSize = new int[1];
int maximumTextureSize = 0;
// Iterate through all the configurations to located the maximum texture size
for (int i = 0; i < totalConfigurations[0]; i++) {
// Only need to check for width since opengl textures are always squared
egl.eglGetConfigAttrib(display, configurationsList[i], EGL10.EGL_MAX_PBUFFER_WIDTH, textureSize);
// Keep track of the maximum texture size
if (maximumTextureSize < textureSize[0])
maximumTextureSize = textureSize[0];
}
// Release
egl.eglTerminate(display);
// Return largest texture size found, or default
return Math.max(maximumTextureSize, IMAGE_MAX_BITMAP_DIMENSION);
}
From my testing, this is pretty reliable and doesn't require you to create an instance.
Performance-wise, this took 18 milliseconds to execute on my Note 2 and only 4 milliseconds on my G3.

This limit should be coming from the underlying OpenGL implementation. If you're already using OpenGL in your app, you can use something like this to get the maximum size:
int[] maxSize = new int[1];
gl.glGetIntegerv(GL10.GL_MAX_TEXTURE_SIZE, maxSize, 0);
// maxSize[0] now contains max size(in both dimensions)
This shows that my both my Galaxy Nexus and Galaxy S2 have a maximum of 2048x2048.
Unfortunately, if you're not already using it, the only way to get an OpenGL context to call this from is to create one(including the surfaceview, etc), which is a lot of overhead just to query a maximum size.

this will decode and scale image before loaded into memory,just change landscape and portrait to the size you actually want
BitmapFactory.Options options = new BitmapFactory.Options();
options.inJustDecodeBounds = true;
BitmapFactory.decodeFile(path, options);
int imageHeight = options.outHeight;
int imageWidth = options.outWidth;
String imageType = options.outMimeType;
if(imageWidth > imageHeight) {
options.inSampleSize = calculateInSampleSize(options,512,256);//if landscape
} else{
options.inSampleSize = calculateInSampleSize(options,256,512);//if portrait
}
options.inJustDecodeBounds = false;
bitmap = BitmapFactory.decodeFile(path,options);
method for calculating size
public static int calculateInSampleSize(
BitmapFactory.Options options, int reqWidth, int reqHeight) {
// Raw height and width of image
final int height = options.outHeight;
final int width = options.outWidth;
int inSampleSize = 1;
if (height > reqHeight || width > reqWidth) {
// Calculate ratios of height and width to requested height and width
final int heightRatio = Math.round((float) height / (float) reqHeight);
final int widthRatio = Math.round((float) width / (float) reqWidth);
// Choose the smallest ratio as inSampleSize value, this will guarantee
// a final image with both dimensions larger than or equal to the
// requested height and width.
inSampleSize = heightRatio < widthRatio ? heightRatio : widthRatio;
}
return inSampleSize;
}

If you're on API level 14+ (ICS) you can use the getMaximumBitmapWidth and getMaximumBitmapHeight functions on the Canvas class. This would work on both hardware accelerated and software layers.
I believe the Android hardware must at least support 2048x2048, so that would be a safe lowest value. On software layers, the max size is 32766x32766.

The 2048*2048 limit is for GN. GN is a xhdpi device and perhaps you put the image in the wrong density bucket. I moved a 720*1280 image from drawable to drawable-xhdpi and it worked.
Thanks for the answer by Romain Guy. Here's the link of his answer.

Android imageview get pixel color from scaled image

My home automation app has a feature where people can upload images to their phone with floorplans and dashboards that they can use to control their home automation software. I have them upload two images: one visible image with the graphics that they want displayed, and a second color map with solid colors corresponding to the objects they want to target areas from the visible image. Both images have to be the same size, pixel-wise. When they tap the screen, I want to be able to get the color from the colormap overlay, and then I proceed to do what ever action has been associated with that color. The problem is, the scaling of the image is screwing me up. The images that they use can be larger than the device screen, so I scale them so they will fit within the display. I don't really need pinch to zoom capability right now, but I might implement it later. For now, I just want the image to be displayed at the largest size so it fits on the screen. So, my question is, how could I modify this code so that I can get the correct touchpoint color from the scaled image. The image scaling itself seems to be working fine. It is scaled and displays correctly. I just can't get the right touchpoint.
final Bitmap bm = decodeSampledBitmapFromFile(visible_image, size, size);
if (bm!=null) {
imageview.setScaleType(ImageView.ScaleType.CENTER_INSIDE);
imageview.setImageBitmap(bm);
}
final Bitmap bm2 = decodeSampledBitmapFromFile(image_overlay, size, size);
if (bm2!=null) {
overlayimageview.setScaleType(ImageView.ScaleType.CENTER_INSIDE);
overlayimageview.setImageBitmap(bm2);
imageview.setOnTouchListener(new OnTouchListener() {
#Override
public boolean onTouch(View v, MotionEvent mev) {
DecodeActionDownEvent(v, mev, bm2);
return false;
}
});
}
private void DecodeActionDownEvent(View v, MotionEvent ev, Bitmap bm2)
{
xCoord = Integer.valueOf((int)ev.getRawX());
yCoord = Integer.valueOf((int)ev.getRawY());
try {
// Here's where the trouble is.
// returns the value of the unscaled pixel at the scaled touch point?
colorTouched = bm2.getPixel(xCoord, yCoord);
} catch (IllegalArgumentException e) {
colorTouched = Color.WHITE; // nothing happens when touching white
}
}
private static Bitmap decodeSampledBitmapFromFile(String fileName,
int reqWidth, int reqHeight) {
// code from
// http://developer.android.com/training/displaying-bitmaps/load-bitmap.html
final BitmapFactory.Options options = new BitmapFactory.Options();
options.inJustDecodeBounds = true;
BitmapFactory.decodeFile(fileName, options);
// Calculate inSampleSize
options.inSampleSize = calculateInSampleSize(options, reqWidth, reqHeight);
// Decode bitmap with inSampleSize set
options.inJustDecodeBounds = false;
return BitmapFactory.decodeFile(fileName, options);
}
private static int calculateInSampleSize(
BitmapFactory.Options options, int reqWidth, int reqHeight) {
// code from
// http://developer.android.com/training/displaying-bitmaps/load-bitmap.html
// Raw height and width of image
final int height = options.outHeight;
final int width = options.outWidth;
int inSampleSize = 1;
if (height > reqHeight || width > reqWidth) {
if (width > height) {
inSampleSize = Math.round((float)height / (float)reqHeight);
} else {
inSampleSize = Math.round((float)width / (float)reqWidth);
}
}
return inSampleSize;
}

I figured it out. I replaced
xCoord = Integer.valueOf((int)ev.getRawX());
yCoord = Integer.valueOf((int)ev.getRawY());
with
Matrix inverse = new Matrix();
v.getImageMatrix().invert(inverse);
float[] touchPoint = new float[] {ev.getX(), ev.getY()};
inverse.mapPoints(touchPoint);
xCoord = Integer.valueOf((int)touchPoint[0]);
yCoord = Integer.valueOf((int)touchPoint[1]);

After 7 years I have to provide another answer, because after upgrading to LG G8s from LG G6 the code from accepted answer stopped returning the correct color.
This solution works on all the phones I found at home, but who knows... maybe even this one is not universal.
(Using Xamarin C# but the principle is easy to understand)
First we have to get the actual ImageView size as float to get floating point division
private float imageSizeX;
private float imageSizeY;
private void OnCreate(...) {
...
FindViewById<ImageView>(Resource.Id.colpick_Image).LayoutChange += OnImageLayout;
FindViewById<ImageView>(Resource.Id.colpick_Image).Touch += Image_Touch;
...
}
//Event called every time the layout of our ImageView is updated
private void OnImageLayout(object sender, View.LayoutChangeEventArgs e) {
imageSizeX = Image.Width;
imageSizeY = Image.Height;
Image.LayoutChange -= OnImageLayout; //Just need it once then unsubscribe
}
//Called every time user touches/is touching the ImageView
private void Image_Touch(object sender, View.TouchEventArgs e) {
MotionEvent m = e.Event;
ImageView img = sender as ImageView;
int x = Convert.ToInt32(m.GetX(0));
int y = Convert.ToInt32(m.GetY(0));
Bitmap bmp = (img.Drawable as BitmapDrawable).Bitmap;
// The scale value (how many times is the image bigger)
// I only use it with images where Width == Height, so I get
// scaleX == scaleY
float scaleX = bmp.Width / imageSizeX;
float scaleY = bmp.Height / imageSizeY;
x = (int)(x * scaleX);
y = (int)(y * scaleY);
// Check for invalid values/outside of image bounds etc...
// Get the correct Color ;)
int color = bmp.GetPixel(x, y);
}

Images added to AnimationDrawable programmatically leak memory

I have an android App with plenty of animations.
When I programmatically create animations (using AnimationDrawable) the non-java object (as appears in DDMS Heap tab) grows with every new animation I load and never shrinks back even after my animations get released.
I have only one reference to each AnimationDrawable object from a wrapper object I wrote and I verified this object gets released by overriding the finalize method and making sure it gets called.
Eventually android stops loading images and prints "out of memory" errors to the log.
The interesting thing is that this happens only in some devices (Motorola Xoom, Sony Experia) and not in others (such as the Galaxy S).
This problem is not specific Honeycomb or pre-Honeycomb as you can see from the device examples I gave.
Some of the things I tried:
Calling recycle on each of the frames after I am done with the current animation but it doesn't seem to help.
Assigning null to the AnimationDrawble object
Making sure that there are no static variable related to the class holding the reference to the animation drawable
Make sure the problem disappears once I comment out myAnimation.addFrame(...)

This isn't an exact answer, but rather a helpful hint to find where the exact leak is occurring. Perform a heap-dump after you expect your memory to be reclaimed and see why the objects you think should be dead are still alive.
Make sure you get the memory analyzer tool for eclipse. (http://www.eclipse.org/mat/)

There could be two possible reason, first at the time of creating the bitmap and second when you are converting the bitmap into the BitmapDrawable. As i can see from your comment (new BitmapDrawable(currentFrameBitmap) now this method is depreciated better to use BitmapDrawable(getResources(),currentFrameBitmap) Without the Resources reference, the bitmap may not render properly, even when scaled correctly. To load bitmap efficiently you can scale it properly.
public class BitmapDecoderHelper {
private Context context;
public BitmapDecoderHelper(Context context){
this.context = context;
}
public int calculateInSampleSize(
BitmapFactory.Options options, int reqWidth, int reqHeight) {
// Raw height and width of image
final int height = options.outHeight;
final int width = options.outWidth;
int inSampleSize = 1;
Log.d("height reqheight width reqwidth", height+"//"+reqHeight+"//"+width+"///"+reqWidth);
if (height > reqHeight || width > reqWidth) {
if (width > height) {
inSampleSize = Math.round((float)height / (float)reqHeight);
} else {
inSampleSize = Math.round((float)width / (float)reqWidth);
}
}
return inSampleSize;
}
public Bitmap decodeSampledBitmapFromResource(String filePath,
int reqWidth, int reqHeight) {
// First decode with inJustDecodeBounds=true to check dimensions
final BitmapFactory.Options options = new BitmapFactory.Options();
options.inJustDecodeBounds = true;
BitmapFactory.decodeFile(filePath, options);
// Calculate inSampleSize
options.inSampleSize = calculateInSampleSize(options, reqWidth, reqHeight);
Log.d("options sample size", options.inSampleSize+"///");
// Decode bitmap with inSampleSize set
options.inJustDecodeBounds = false;
// out of memory occured easily need to catch and test the things.
return BitmapFactory.decodeFile(filePath, options);
}
public int getPixels(int dimensions){
Resources r = context.getResources();
int px = (int) TypedValue.applyDimension(TypedValue.COMPLEX_UNIT_DIP, dimensions, r.getDisplayMetrics());
return px;
}
public String getFilePath(Uri selectedImage){
String[] filePathColumn = {MediaStore.Images.Media.DATA};
Cursor cursor = context.getContentResolver().query(selectedImage, filePathColumn, null, null, null);
cursor.moveToFirst();
int columnIndex = cursor.getColumnIndex(filePathColumn[0]);
String filePath = cursor.getString(columnIndex);
cursor.close();
return filePath;
}
}