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.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);
        options.inSampleSize = calculateInSampleSize(options, reqWidth, reqHeight);
        options.inJustDecodeBounds = false;
        Bitmap src = BitmapFactory.decodeFile(pathName, options);
        int degree = readPictureDegree(pathName);
        return rotateBitmap(src, degree);
    }

    private static int calculateInSampleSize(BitmapFactory.Options options, int reqWidth, int reqHeight) {
        int sampleSize = 1;
        int height = options.outHeight;
        int width = options.outWidth;
        if (height > reqHeight || width > reqWidth) {
            final int heightRatio;
            final int widthRatio;
            if (reqHeight == 0) {
                sampleSize = (int) Math.floor((float) width / (float) reqWidth);
            } else if (reqWidth == 0) {
                sampleSize = (int) Math.floor((float) height / (float) reqHeight);
            } else {
                heightRatio = (int) Math.floor((float) height / (float) reqHeight);
                widthRatio = (int) Math.floor((float) width / (float) reqWidth);
                sampleSize = Math.max(heightRatio, widthRatio);
            }
        }
        return sampleSize;
    }

    public 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;
    }

    public static Bitmap rotateBitmap(Bitmap source, int angle) {
        Matrix matrix = new Matrix();
        if (angle > 0)
            matrix.setRotate(angle);
        Bitmap bitmap = Bitmap.createBitmap(source, 0, 0, source.getWidth(), source.getHeight(), matrix, true);
        if (bitmap != source && !source.isRecycled())
            source.recycle();
        return bitmap;
    }
}