Android-Confirm that the ImageView picture is loaded successfully

confirm that the ImageView picture is loaded successfully

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To determine if the ImageView picture exists and is not loaded successfully, the default picture is displayed.

      if (mphotoview.getdrawable () = = null) {//            Toast.maketext (getactivity (), "Picture loading Failed", Toast.length_short). Show ();            Mphotoview.setimagedrawable (Getresources (). getdrawable (R.drawable.icon_default_user_photo));        }

conversion between bitmap, drawable, Byte,id in Android
1. Convert Bitmap to Byte

Bytearrayoutputstream out = new Bytearrayoutputstream (); Bitmap.compress (Bitmap.CompressFormat.PNG, +, out); byte[] Array= Out.tobytearray ();

2. Convert byte to bitmap

Bitmap Bitmap = bitmapfactory.decodebytearray (data, 0, data.length);

3. Bitmap converted to drawable

drawable drawable = new fastbitmapdrawable (bitmap);

4. drawable converted to bitmap
A. bitmapdrawable, fastbitmapdrawable directly with Getbitmap
B. Other types of drawable using canvas to draw on a bitmap

      Canvas canvas = new Canvas (bitmap)      Drawable.draw (canvas)

5.id Conversion graphic.drawable

drawable drawable = Activity.getresources (). getdrawable (R.drawable.icon);

6.id into bitmap

Bitmap Bitmap = bitmapfactory. Decoderesource (Resources   res, int id)

Android-Confirm that the ImageView picture is loaded successfully