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POAndroid listview image lag
 

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  1. POAndroid listview image lag
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    <p>My app contains a listview which can optionally contain images from a users sd card. It works fine however when any image is loaded there is noticeable lag. I have this in my getView:</p> <pre><code> BitmapFactory.Options o = new BitmapFactory.Options(); o.inJustDecodeBounds = true; BitmapFactory.decodeFile(image, o); final int REQUIRED_SIZE=70; //Find the correct scale value. It should be the power of 2. int width_tmp=o.outWidth, height_tmp=o.outHeight; int scale=1; while(true){ if(width_tmp/2&lt;REQUIRED_SIZE || height_tmp/2&lt;REQUIRED_SIZE) break; width_tmp/=2; height_tmp/=2; scale++; } //Decode with inSampleSize BitmapFactory.Options o2 = new BitmapFactory.Options(); o2.inSampleSize=scale; Bitmap myBitmap = BitmapFactory.decodeFile(image, o2); image_main.setImageBitmap(myBitmap); </code></pre> <p>Any suggestions?</p> <p>EDIT: Replaced the above with this but no images are loading...</p> <pre><code> class Thumbnailer extends AsyncTask&lt;String, Void, Bitmap&gt; { String image; @Override protected void onPostExecute(Bitmap result) { image_main.setImageBitmap(result); } @Override protected void onProgressUpdate(Void... progress) { } @Override protected Bitmap doInBackground(String... params) { BitmapFactory.Options o = new BitmapFactory.Options(); o.inJustDecodeBounds = true; BitmapFactory.decodeFile(image, o); final int REQUIRED_SIZE=70; //Find the correct scale value. It should be the power of 2. int width_tmp=o.outWidth, height_tmp=o.outHeight; int scale=1; while(true){ if(width_tmp/2&lt;REQUIRED_SIZE || height_tmp/2&lt;REQUIRED_SIZE) break; width_tmp/=2; height_tmp/=2; scale++; } //Decode with inSampleSize BitmapFactory.Options o2 = new BitmapFactory.Options(); o2.inSampleSize=scale; return BitmapFactory.decodeFile(image, o2); } } new Thumbnailer().execute(image); </code></pre>
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