Main.java Source code

Introduction

Here is the source code for Main.java

Source

//package com.java2s;

import android.content.Context;
import android.content.res.AssetManager;
import android.graphics.Bitmap;
import android.graphics.BitmapFactory;

import java.io.IOException;
import java.io.InputStream;

public class Main {

    public static Bitmap getImageBitmapFromAssetsFolderThroughImagePathName(Context context, String imagePathName,
            int reqWidth, int reqHeight) {
        BitmapFactory.Options opts = new BitmapFactory.Options();
        opts.inJustDecodeBounds = true;
        Bitmap bitmap = null;
        AssetManager assetManager = context.getResources().getAssets();
        InputStream inputStream = null;

        try {
            inputStream = assetManager.open(imagePathName);
            inputStream.mark(Integer.MAX_VALUE);
        } catch (IOException e) {
            e.printStackTrace();
            return null;
        } catch (OutOfMemoryError e) {
            e.printStackTrace();
            System.gc();
            return null;
        }

        try {
            if (inputStream != null) {
                BitmapFactory.decodeStream(inputStream, null, opts);
                inputStream.reset();
            } else {
                return null;
            }
        } catch (OutOfMemoryError e) {
            e.printStackTrace();
            System.gc();
            return null;
        } catch (Exception e) {
            e.printStackTrace();
            return null;
        }
        opts.inSampleSize = calculateInSampleSiez(opts, reqWidth, reqHeight);
        //         Log.d(TAG,""+opts.inSampleSize);
        opts.inJustDecodeBounds = false;
        opts.inPreferredConfig = Bitmap.Config.RGB_565;
        opts.inPurgeable = true;
        opts.inInputShareable = true;
        opts.inDither = false;
        opts.inTempStorage = new byte[512 * 1024];
        try {
            if (inputStream != null) {
                bitmap = BitmapFactory.decodeStream(inputStream, null, opts);
            } else {
                return null;
            }
        } catch (OutOfMemoryError e) {
            e.printStackTrace();
            System.gc();
            return null;
        } catch (Exception e) {
            e.printStackTrace();
            return null;
        } finally {
            if (inputStream != null) {
                try {
                    inputStream.close();
                } catch (Exception e) {
                    e.printStackTrace();
                    return null;
                }
            }
        }
        //Log.d(TAG,"w:"+bitmap.getWidth()+" h:"+bitmap.getHeight());
        if (bitmap != null) {
            try {
                bitmap = Bitmap.createScaledBitmap(bitmap, reqWidth, reqHeight, true);
            } catch (OutOfMemoryError outOfMemoryError) {
                outOfMemoryError.printStackTrace();
                System.gc();
                return null;
            }
        }
        return bitmap;
    }

    public static int calculateInSampleSiez(BitmapFactory.Options options, int reqWidth, int reqHeight) {
        // Raw height and width of image
        final int height = options.outHeight;
        final int width = options.outWidth;
        int inSampleSize = 1;

        if (height > reqHeight || width > reqWidth) {

            final int halfHeight = height / 2;
            final int halfWidth = width / 2;

            // Calculate the largest inSampleSize value that is a power of 2 and keeps both
            // height and width larger than the requested height and width.
            while ((halfHeight / inSampleSize) > reqHeight && (halfWidth / inSampleSize) > reqWidth) {
                inSampleSize *= 2;
            }
        }
        return inSampleSize;
    }
}