Android Bitmap Decode decodeSampledBitmap(Uri uri, int reqWidth, int reqHeight, Activity act)

Description

decode Sampled Bitmap

License

Apache License

Declaration

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

Method Source Code

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

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

import android.util.Log;

import android.annotation.SuppressLint;
import android.app.Activity;

import android.graphics.Bitmap;
import android.graphics.BitmapFactory;

import android.net.Uri;

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

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

        // First decode with inJustDecodeBounds=true to check dimensions
        InputStream is;/*from   w  w  w.  j a v a2 s . c  om*/
        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;
    }

    /** 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;
    }
}

Related

1. decodeBitmap(String path, int displayWidth, int displayHeight)
2. decodeBitmap(String path, int maxImageSize)
3. decodeSampledBitmapFromFile(String filename, int reqWidth, int reqHeight)
4. decodeBitmapFromAssets(Context context, String fileName)
5. decodeImageFile(String strImagePath, BitmapFactory.Options options, boolean checkOrientation)
6. decodeSampledBitmapFromByte(byte[] res, int reqWidth, int reqHeight)
7. decodeSampledBitmapFromFile(String file, int reqWidth, int reqHeight)