src/com/owncloud/android/ui/preview/ImageViewCustom.java

   1 package com.owncloud.android.ui.preview;
   2
   3 import android.annotation.SuppressLint;
   4 import android.content.Context;
   5 import android.graphics.Bitmap;
   6 import android.graphics.Canvas;
   7 import android.os.Build;
   8 import android.util.AttributeSet;
   9 import android.view.View;
  10 import android.widget.ImageView;
  11
  12 import com.owncloud.android.lib.common.utils.Log_OC;
  13
  14 public class ImageViewCustom extends ImageView {
  15
  16     private static final String TAG = ImageViewCustom.class.getSimpleName();
  17
  18     private static final boolean IS_ICS_OR_HIGHER = Build.VERSION.SDK_INT >= Build.VERSION_CODES.ICE_CREAM_SANDWICH;
  19     private static final boolean IS_VERSION_BUGGY_ON_RECYCLES =
  20             Build.VERSION.SDK_INT == Build.VERSION_CODES.JELLY_BEAN_MR1 ||
  21             Build.VERSION.SDK_INT == Build.VERSION_CODES.JELLY_BEAN_MR2;
  22
  23     private int mBitmapHeight;
  24     private int mBitmapWidth;
  25
  26
  27     public ImageViewCustom(Context context) {
  28         super(context);
  29     }
  30
  31     public ImageViewCustom(Context context, AttributeSet attrs) {
  32         super(context, attrs);
  33     }
  34
  35     public ImageViewCustom(Context context, AttributeSet attrs, int defStyle) {
  36         super(context, attrs, defStyle);
  37     }
  38
  39     @SuppressLint("NewApi")
  40         @Override
  41     protected void onDraw(Canvas canvas) {
  42
  43         if(IS_ICS_OR_HIGHER && checkIfMaximumBitmapExceed(canvas) || IS_VERSION_BUGGY_ON_RECYCLES ) {
  44             // Software type is set with two targets:
  45             // 1. prevent that bitmaps larger than maximum textures allowed are shown as black views in devices
  46             //  with LAYER_TYPE_HARDWARE enabled by default;
  47             // 2. grant that bitmaps are correctly dellocated from memory in versions suffering the bug fixed in
  48             //  https://android.googlesource.com/platform/frameworks/base/+/034de6b1ec561797a2422314e6ef03e3cd3e08e0;
  49             //
  50             setLayerType(View.LAYER_TYPE_SOFTWARE, null);
  51         }
  52
  53         super.onDraw(canvas);
  54     }
  55
  56     /**
  57      * Checks if current bitmaps exceed the maximum OpenGL texture size limit
  58      * @param canvas        Canvas where the view will be drawn into.
  59      * @return boolean      True means that the bitmap is too big for the canvas.
  60      */
  61     @SuppressLint("NewApi")
  62         private boolean checkIfMaximumBitmapExceed(Canvas canvas) {
  63         Log_OC.v(TAG, "Canvas maximum: " + canvas.getMaximumBitmapWidth() + " - " + canvas.getMaximumBitmapHeight());
  64         if (mBitmapWidth > canvas.getMaximumBitmapWidth()
  65                 || mBitmapHeight > canvas.getMaximumBitmapHeight()) {
  66             return true;
  67         }
  68
  69         return false;
  70     }
  71
  72     @Override
  73     /**
  74      * Keeps the size of the bitmap cached in member variables for faster access in {@link #onDraw(Canvas)} ,
  75      * but without keeping another reference to the {@link Bitmap}
  76      */
  77     public void setImageBitmap (Bitmap bm) {
  78         mBitmapWidth = bm.getWidth();
  79         mBitmapHeight = bm.getHeight();
  80         super.setImageBitmap(bm);
  81     }
  82
  83 }