Main.java Source code

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Here is the source code for Main.java

Source

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

import java.io.FileNotFoundException;
import java.io.IOException;
import java.io.InputStream;
import android.util.DisplayMetrics;
import android.util.Log;
import android.util.TypedValue;
import android.annotation.SuppressLint;
import android.app.Activity;
import android.content.res.Resources;
import android.graphics.Bitmap;
import android.graphics.BitmapFactory;
import android.graphics.Matrix;
import android.media.ExifInterface;
import android.net.Uri;

public class Main {
    private static final String TAG = "vlCameraBitmapUtils";

    public static Bitmap downSampleBitmap(Uri uri, Activity act, Boolean needRotate) {
        DisplayMetrics displaymetrics = new DisplayMetrics();
        act.getWindowManager().getDefaultDisplay().getMetrics(displaymetrics);
        Resources r = act.getResources();
        int px = (int) TypedValue.applyDimension(TypedValue.COMPLEX_UNIT_DIP, 50, r.getDisplayMetrics()); // 50: magic num
        int targetWidth = displaymetrics.heightPixels;
        int targetHeight = displaymetrics.widthPixels - px;

        Bitmap resizedBitmap = decodeSampledBitmap(uri, targetWidth, targetHeight, act);
        Bitmap returnBitmap = null;
        ExifInterface exif;
        try {
            float degree = 0;
            exif = new ExifInterface(uri.toString());
            int orient = exif.getAttributeInt(ExifInterface.TAG_ORIENTATION, ExifInterface.ORIENTATION_NORMAL);
            if (resizedBitmap != null && needRotate) {
                degree = getDegree(orient);
                if (degree != 0) {
                    returnBitmap = createRotatedBitmap(resizedBitmap, degree);
                }
                returnBitmap = returnBitmap == null ? resizedBitmap : returnBitmap;
            }
        } catch (IOException e) {
            Log.v(TAG, "not found file at downsample");
            e.printStackTrace();
        }
        return returnBitmap;
    }

    @SuppressLint("NewApi")
    public static Bitmap decodeSampledBitmap(Uri uri, int reqWidth, int reqHeight, Activity act) {

        // First decode with inJustDecodeBounds=true to check dimensions
        InputStream is;
        try {
            is = act.getApplicationContext().getContentResolver().openInputStream(uri);
            final BitmapFactory.Options options = new BitmapFactory.Options();
            options.inJustDecodeBounds = true;
            BitmapFactory.decodeStream(is, null, options);
            is.close(); //consider use is.mark and is.reset instead [TODO]

            // Calculate inSampleSize
            options.inSampleSize = calculateInSampleSize(options, reqWidth, reqHeight);

            // Decode bitmap with inSampleSize set
            //open input stream again
            is = act.getApplicationContext().getContentResolver().openInputStream(uri);
            options.inJustDecodeBounds = false;
            Bitmap ret = BitmapFactory.decodeStream(is, null, options);
            is.close();
            return ret;
        } catch (FileNotFoundException e) {
            Log.v(TAG, "File not found:" + uri.toString());
            e.printStackTrace();
        } catch (IOException e) {
            Log.v(TAG, "I/O exception with file:" + uri.toString());
            e.printStackTrace();
        }
        return null;
    }

    public static float getDegree(int exifOrientation) {
        if (exifOrientation == ExifInterface.ORIENTATION_ROTATE_90)
            return 180;
        else if (exifOrientation == ExifInterface.ORIENTATION_ROTATE_180)
            return 270;
        else if (exifOrientation == ExifInterface.ORIENTATION_ROTATE_270)
            return 0;

        return 90;
    }

    public static Bitmap createRotatedBitmap(Bitmap bm, float degree) {
        Bitmap bitmap = null;
        if (degree != 0) {
            Matrix matrix = new Matrix();
            matrix.preRotate(degree);
            bitmap = Bitmap.createBitmap(bm, 0, 0, bm.getWidth(), bm.getHeight(), matrix, true);
        }

        return bitmap;
    }

    /** bitmap downsample utils **/
    public static int calculateInSampleSize(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 heightRatio = Math.round((float) height / (float) reqHeight);
            final int widthRatio = Math.round((float) width / (float) reqWidth);

            inSampleSize = heightRatio < widthRatio ? heightRatio : widthRatio;
        }

        return inSampleSize;
    }
}