ViewPager java.lang.OutOfMemoryError: bitmap size exceeds VM budget [duplicate]

Question

Possible Duplicate:
java.lang.OutOfMemoryError: bitmap size exceeds VM budget - Android

I used ViewPager to show set of images from resource folder , if my images was small in size every thing works fine ,

but when i replace it with high definition images which i need it to be in my app , it gave me this error :

java.lang.OutOfMemoryError: bitmap size exceeds VM budget

note 1 :

i have now 5 images in my code for testing but finally i will have around 30 high definition images ,

note 2 :

i wonder why this happen , i am new to android and first time to use viewpager class , before i used gallery class in another app with more than 30 high definition images and no exception happend .

any advice will be appreciated , thanks alot

my code :

logcat stack:

   FATAL EXCEPTION: main
    java.lang.OutOfMemoryError: bitmap size exceeds VM budget
at android.graphics.BitmapFactory.nativeDecodeAsset(Native Method)
at android.graphics.BitmapFactory.decodeStream(BitmapFactory.java:563)
at android.graphics.BitmapFactory.decodeResourceStream(BitmapFactory.java:439)
at android.graphics.BitmapFactory.decodeResource(BitmapFactory.java:462)
at android.graphics.BitmapFactory.decodeResource(BitmapFactory.java:488)
at com.test.demo.MyPagerAdapter.<init>(MyPagerAdapter.java:42)
at com.test.demo.MainActivity.onCreate(MainActivity.java:15)
at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1047)
at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:1615)
at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:1667)
at android.app.ActivityThread.access$1500(ActivityThread.java:117)
at android.app.ActivityThread$H.handleMessage(ActivityThread.java:935)
at android.os.Handler.dispatchMessage(Handler.java:99)
at android.os.Looper.loop(Looper.java:123)
at android.app.ActivityThread.main(ActivityThread.java:3687)
at java.lang.reflect.Method.invokeNative(Native Method)
at java.lang.reflect.Method.invoke(Method.java:507)
at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:842)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:600)
at dalvik.system.NativeStart.main(Native Method)

MainActivity

 public class MainActivity extends Activity {  
  private ViewPager mMyPager;
  private MyPagerAdapter mMyPagerAdapter;

public void onCreate(Bundle savedInstanceState) {   
  super.onCreate(savedInstanceState);   
    setContentView(R.layout.main);   

  mMyPager = (ViewPager) findViewById(R.id.mypages);           
  mMyPagerAdapter = new MyPagerAdapter(this);   
  mMyPager.setAdapter(mMyPagerAdapter);  }} 

MyPagerAdapter

  public class MyPagerAdapter extends PagerAdapter {   

    private ArrayList<ImageView> mViewsList;   
private Context mContext = null;   

public MyPagerAdapter(Context context) {   
    mContext = context;   
    mViewsList = new ArrayList<ImageView>();   

    Resources resource = mContext.getResources();   
   Bitmap bMap1 = BitmapFactory.decodeResource(resource,   
            R.drawable.one);   
   ImageView image1 = new ImageView(mContext);   
    image1.setImageBitmap(bMap1);      
    mViewsList.add(image1);   

    Bitmap bMap2 = BitmapFactory.decodeResource(resource,   
            R.drawable.two );   
    ImageView image2 = new ImageView(mContext);   
    image2.setImageBitmap(bMap2);      
    mViewsList.add(image2);   

    Bitmap bMap3 = BitmapFactory.decodeResource(resource,   
            R.drawable.three);   
   ImageView image3 = new ImageView(mContext);   
    image3.setImageBitmap(bMap3);      
    mViewsList.add(image3); 

    Bitmap bMap4 = BitmapFactory.decodeResource(resource,   
            R.drawable.four);   
   ImageView image4 = new ImageView(mContext);   
    image4.setImageBitmap(bMap4);      
    mViewsList.add(image4); 

    Bitmap bMap5 = BitmapFactory.decodeResource(resource,   
            R.drawable.five);   
   ImageView image5 = new ImageView(mContext);   
    image5.setImageBitmap(bMap5);      
    mViewsList.add(image5); 
               }      

@Override  
public int getCount() {   
    return mViewsList.size();   
                        }   

@Override  
public Object instantiateItem(View view, int position) {   
    View myView = mViewsList.get(position);   
    ((ViewPager) view).addView(myView);   
    return myView;   
              }   

@Override  
public boolean isViewFromObject(View view, Object object) {   
    return view == object;   
                  }   

@Override  
public void destroyItem(View view, int arg1, Object object) {   
    ((ViewPager) view).removeView((ImageView) object);   
                }   
                   }  

Answer 1

Your Adaptor should not be written the way you have it. You should only be decoding the bitmaps in the instantiateItem method.

private Context context;
private ArrayList<Integer> mResourceList;
private Resources resource;  

public MyPagerAdapter(Context context) { 
    this.context = context;

    resource = context.getResources();

    mResourceList = new ArrayList<Integer>();     
    mResourceList.add(R.drawable.one);
    mResourceList.add(R.drawable.two);
    mResourceList.add(R.drawable.three);
    mResourceList.add(R.drawable.four);
    mResourceList.add(R.drawable.five);
}

@Override  
public Object instantiateItem(View view, int position) {   
        ImageView myView = new ImageView(context);

        Bitmap bitmap = BitmapFactory.decodeResource(resource, mResourceList.get(position) );
        myView.setImageBitmap(bitmap);

        ((ViewPager) view).addView(myView);   
        return myView;   
}   

Now, you need to make sure that your bitmaps are not exceeding the max size value (2048px x 2048px).

If you are, you must scale your image down. This can be done by adding a BitmapFactory.Options object to your BitmapFactory.decodeResouce parameters and setting the inSampleSize by a power of 2. Setting it by 2 will sample it down to 50%, 4 to 25%, etc.

BitmapFactory.Options options = new BitmapFactory.Options()
options.inSampleSize = 2

Bitmap bitmap = BitmapFactory.decodeResource(resource, mResouceList.get(position), options );

Hope this helped!