I am using a simple static image gallery in which i am loading atleast 28 images each of different size below 150kb.
and i noticed two issues here:
1) Slow scroll 2) Out of memory exception when i go to this activity two three - times.
Any one guide me what is the issue here and how to resolve it?
any help would be appreciated
Log Cat:
03-15 15:32:55.899: E/AndroidRuntime(14662): java.lang.OutOfMemoryError: bitmap size exceeds VM budget
03-15 15:32:55.899: E/AndroidRuntime(14662): at android.graphics.BitmapFactory.nativeDecodeAsset(Native Method)
03-15 15:32:55.899: E/AndroidRuntime(14662): at android.graphics.BitmapFactory.decodeStream(BitmapFactory.java:563)
03-15 15:32:55.899: E/AndroidRuntime(14662): at android.graphics.BitmapFactory.decodeResourceStream(BitmapFactory.java:439)
03-15 15:32:55.899: E/AndroidRuntime(14662): at android.graphics.drawable.Drawable.createFromResourceStream(Drawable.java:697)
03-15 15:32:55.899: E/AndroidRuntime(14662): at android.content.res.Resources.loadDrawable(Resources.java:1709)
03-15 15:32:55.899: E/AndroidRuntime(14662): at android.content.res.Resources.getDrawable(Resources.java:581)
03-15 15:32:55.899: E/AndroidRuntime(14662): at android.widget.ImageView.resolveUri(ImageView.java:501)
03-15 15:32:55.899: E/AndroidRuntime(14662): at android.widget.ImageView.setImageResource(ImageView.java:280)
03-15 15:32:55.899: E/AndroidRuntime(14662): at com.tackfu.Art$ImageAdapter.getView(Art.java:84)
03-15 15:32:55.899: E/AndroidRuntime(14662): at android.widget.AbsListView.obtainView(AbsListView.java:1515)
03-15 15:32:55.899: E/AndroidRuntime(14662): at android.widget.GridView.makeAndAddView(GridView.java:1269)
03-15 15:32:55.899: E/AndroidRuntime(14662): at android.widget.GridView.makeRow(GridView.java:315)
03-15 15:32:55.899: E/AndroidRuntime(14662): at android.widget.GridView.fillDown(GridView.java:268)
03-15 15:32:55.899: E/AndroidRuntime(14662): at android.widget.GridView.fillGap(GridView.java:235)
03-15 15:32:55.899: E/AndroidRuntime(14662): at android.widget.AbsListView.trackMotionScroll(AbsListView.java:4063)
03-15 15:32:55.899: E/AndroidRuntime(14662): at android.widget.AbsListView.onTouchEvent(AbsListView.java:2471)
03-15 15:32:55.899: E/AndroidRuntime(14662): at android.view.View.dispatchTouchEvent(View.java:3885)
03-15 15:32:55.899: E/AndroidRuntime(14662): at android.view.ViewGroup.dispatchTouchEvent(ViewGroup.java:903)
03-15 15:32:55.899: E/AndroidRuntime(14662): at android.view.ViewGroup.dispatchTouchEvent(ViewGroup.java:942)
03-15 15:32:55.899: E/AndroidRuntime(14662): at android.view.ViewGroup.dispatchTouchEvent(ViewGroup.java:942)
03-15 15:32:55.899: E/AndroidRuntime(14662): at android.view.ViewGroup.dispatchTouchEvent(ViewGroup.java:942)
03-15 15:32:55.899: E/AndroidRuntime(14662): at com.android.internal.policy.impl.PhoneWindow$DecorView.superDispatchTouchEvent(PhoneWindow.java:1750)
03-15 15:32:55.899: E/AndroidRuntime(14662): at com.android.internal.policy.impl.PhoneWindow.superDispatchTouchEvent(PhoneWindow.java:1135)
03-15 15:32:55.899: E/AndroidRuntime(14662): at android.app.Activity.dispatchTouchEvent(Activity.java:2096)
03-15 15:32:55.899: E/AndroidRuntime(14662): at com.android.internal.policy.impl.PhoneWindow$DecorView.dispatchTouchEvent(PhoneWindow.java:1734)
03-15 15:32:55.899: E/AndroidRuntime(14662): at android.view.ViewRoot.deliverPointerEvent(ViewRoot.java:2216)
03-15 15:32:55.899: E/AndroidRuntime(14662): at android.view.ViewRoot.handleMessage(ViewRoot.java:1887)
03-15 15:32:55.899: E/AndroidRuntime(14662): at android.os.Handler.dispatchMessage(Handler.java:99)
03-15 15:32:55.899: E/AndroidRuntime(14662): at android.os.Looper.loop(Looper.java:130)
03-15 15:32:55.899: E/AndroidRuntime(14662): at android.app.ActivityThread.main(ActivityThread.java:3687)
03-15 15:32:55.899: E/AndroidRuntime(14662): at java.lang.reflect.Method.invokeNative(Native Method)
03-15 15:32:55.899: E/AndroidRuntime(14662): at java.lang.reflect.Method.invoke(Method.java:507)
03-15 15:32:55.899: E/AndroidRuntime(14662): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:867)
03-15 15:32:55.899: E/AndroidRuntime(14662): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:625)
03-15 15:32:55.899: E/AndroidRuntime(14662): at dalvik.system.NativeStart.main(Native Method)
Activity Code:
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.art);
GridView gridview = (GridView) findViewById(R.id.gridv
gridview.setAdapter(new ImageAdapter(this));
}
public class ImageAdapter extends BaseAdapter {
private Context mContext;
public ImageAdapter(Context c) {
mContext = c;
}
public int getCount() {
return mThumbIds.length;
}
public Object getItem(int position) {
return null;
}
public long getItemId(int position) {
return 0;
}
// create a new ImageView for each item referenced by the Adapter
public View getView(int position, View convertView, ViewGroup parent) {
ImageView imageView;
if (convertView == null) { // if it's not recycled, initialize some attributes
imageView = new ImageView(mContext);
imageView.setLayoutParams(new GridView.LayoutParams(85, 85));
imageView.setScaleType(ImageView.ScaleType.CENTER_CROP);
imageView.setPadding(8, 8, 8, 8);
} else {
imageView = (ImageView) convertView;
}
imageView.setImageResource(mThumbIds[position]);
return imageView;
}
// references to our images
private Integer[] mThumbIds = {
R.drawable.i1, R.drawable.i2,
R.drawable.i3, R.drawable.i4,
R.drawable.i5, R.drawable.i6,
R.drawable.i7, R.drawable.i8,
R.drawable.i9, R.drawable.i10,
R.drawable.i11, R.drawable.i12,
R.drawable.i13,R.drawable.i14,
R.drawable.i15,R.drawable.i16,
R.drawable.i17,R.drawable.i18,
R.drawable.i19,R.drawable.i20,
R.drawable.i21, R.drawable.i22,
R.drawable.i23, R.drawable.i24,
R.drawable.i26, R.drawable.i28,
R.drawable.i29, R.drawable.i30
};
}
Recycle bitmaps when not in use. Use a view holder for better performance. http://www.youtube.com/watch?v=wDBM6wVEO70. I suggest you have a look at the link. Whatever applies to listview also applies to gridview and the video talks about it. The video also has a talk on view holder which is exactly what you should be using to avoid memory leaks.
There is also a talk about avoiding memory leaks at http://android-developers.blogspot.de/2009/01/avoiding-memory-leaks.html.
http://developer.android.com/training/displaying-bitmaps/load-bitmap.html. see the section Load a Scaled Down Version into Memory
Use a MAT Analyzer to check memory leaks. http://www.youtube.com/watch?v=_CruQY55HOk.
Consider some tips at http://developer.android.com/training/articles/perf-tips.html.