Reduce Bitmap size using BitmapFactory.Options.inSampleSize

Reduce Bitmap size using BitmapFactory.Options.inSampleSize

In the post "Load ImageView with JPG file in SD Card", the ImageView is loaded with bitmap in full-size. It cost too much resources for a mobile device, and easy to make the app closed unexpectly.

We can generate a shrinked bitmap using BitmapFactory.Optionswith inSampleSize; such that to reduce the needed resources greatly.

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package com.AndroidLoadImageView;   import android.app.Activity; import android.graphics.Bitmap; import android.graphics.BitmapFactory; import android.os.Bundle; import android.widget.ImageView;   public class AndroidLoadImageViewActivity extends Activity {     String imagefile ="/sdcard/IMG_9331.JPG";        /** Called when the activity is first created. */     @Override     public void onCreate(Bundle savedInstanceState) {         super.onCreate(savedInstanceState);         setContentView(R.layout.main);                   ImageView image = (ImageView)findViewById(R.id.image);         //Bitmap bm = BitmapFactory.decodeFile(imagefile);         Bitmap bm = ShrinkBitmap(imagefile, 300, 300);         image.setImageBitmap(bm);     }        Bitmap ShrinkBitmap(String file, int width, int height){          BitmapFactory.Options bmpFactoryOptions = new BitmapFactory.Options();         bmpFactoryOptions.inJustDecodeBounds = true;         Bitmap bitmap = BitmapFactory.decodeFile(file, bmpFactoryOptions);                   int heightRatio = (int)Math.ceil(bmpFactoryOptions.outHeight/(float)height);         int widthRatio = (int)Math.ceil(bmpFactoryOptions.outWidth/(float)width);                   if (heightRatio > 1 || widthRatio > 1)         {          if (heightRatio > widthRatio)          {           bmpFactoryOptions.inSampleSize = heightRatio;          } else {           bmpFactoryOptions.inSampleSize = widthRatio;          }         }                   bmpFactoryOptions.inJustDecodeBounds = false;         bitmap = BitmapFactory.decodeFile(file, bmpFactoryOptions);      return bitmap;     } } akm www.cdacians.com