Main.java Source code

Introduction

Here is the source code for Main.java

Source

//package com.java2s;
//License from project: Apache License 

import android.graphics.Bitmap;
import android.graphics.BitmapFactory;
import android.graphics.Matrix;
import android.media.ExifInterface;

import java.io.ByteArrayOutputStream;

import java.io.IOException;

public class Main {
    public static Bitmap decodeSampledBitmapFromFd(String pathName, int reqWidth, int reqHeight) {
        final BitmapFactory.Options options = new BitmapFactory.Options();
        //        options.inJustDecodeBounds = true;
        //        BitmapFactory.decodeFile(pathName, options);
        int sampleSize = calculateInSampleSize(options, reqWidth, reqHeight);
        //        if(sampleSize < 4)
        //        {
        //            sampleSize = 4;
        //        }
        options.inSampleSize = sampleSize;
        options.inJustDecodeBounds = false;
        Bitmap src = BitmapFactory.decodeFile(pathName, options);
        return src;
    }

    public static Bitmap decodeSampledBitmapFromFd(String filePath) {
        final BitmapFactory.Options options = new BitmapFactory.Options();
        options.inJustDecodeBounds = true;
        BitmapFactory.decodeFile(filePath, options);

        // Calculate inSampleSize
        //        if(Build.VERSION.SDK_INT < 19)
        //        {
        //            options.inSampleSize = calculateInSampleSize(options, 300, 300);
        //        }
        //        else
        //        {
        options.inSampleSize = calculateInSampleSize(options, 480, 480);

        //        }

        // Decode bitmap with inSampleSize set
        options.inJustDecodeBounds = false;

        Bitmap bm = BitmapFactory.decodeFile(filePath, options);
        if (bm == null) {
            return null;
        }
        int degree = readPictureDegree(filePath);
        bm = rotateBitmap(bm, degree);
        ByteArrayOutputStream baos = null;
        try {
            baos = new ByteArrayOutputStream();
            bm.compress(Bitmap.CompressFormat.JPEG, 30, baos);

        } finally {
            try {
                if (baos != null)
                    baos.close();
            } catch (IOException e) {
                e.printStackTrace();
            }
        }
        return bm;

    }

    private static int calculateInSampleSize(BitmapFactory.Options options, int reqWidth, int reqHeight) {
        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;
            while ((halfHeight / inSampleSize) > reqHeight && (halfWidth / inSampleSize) > reqWidth) {
                inSampleSize *= 2;
            }
        }
        return inSampleSize;
    }

    private static int readPictureDegree(String path) {
        int degree = 0;
        try {
            ExifInterface exifInterface = new ExifInterface(path);
            int orientation = exifInterface.getAttributeInt(ExifInterface.TAG_ORIENTATION,
                    ExifInterface.ORIENTATION_NORMAL);
            switch (orientation) {
            case ExifInterface.ORIENTATION_ROTATE_90:
                degree = 90;
                break;
            case ExifInterface.ORIENTATION_ROTATE_180:
                degree = 180;
                break;
            case ExifInterface.ORIENTATION_ROTATE_270:
                degree = 270;
                break;
            }
        } catch (IOException e) {
            e.printStackTrace();
        }
        return degree;
    }

    private static Bitmap rotateBitmap(Bitmap bitmap, int rotate) {
        if (bitmap == null)
            return null;

        int w = bitmap.getWidth();
        int h = bitmap.getHeight();

        // Setting post rotate to 90
        Matrix mtx = new Matrix();
        mtx.postRotate(rotate);
        return Bitmap.createBitmap(bitmap, 0, 0, w, h, mtx, true);
    }
}