如何从10MB图像COM preSS位从相机300KB beforw在android系统设置的ImageView [英] How to compress bitmap from 10mb image from camera to 300kb beforw setting to imageview in android

问题描述

Bitmap bitmap;
BitmapFactory.Options bitmapOptions = new BitmapFactory.Options();
bitmap = BitmapFactory.decodeFile(f.getAbsolutePath(),bitmapOptions); 

终于有位来自摄像机的图像（我正在图像从高清晰度摄像机），这样大小可能是10MB。的

finally bitmap has the image from camera (i am taking image from a high resolution camera ) so size may be 10mb.

我想设置ImageView的位图，如下

I am trying to set the bitmap in imageview as below

portfolioPicImgId.setImageBitmap(bitmap);

• ，我想COM preSS影像分为300KB之前，我怎样才能实现
  这个！


• 我见过的其他计算器的答案，但如何指定确切地
  300KB



推荐答案

你试过吗？

//decodes image and scales it to reduce memory consumption
private Bitmap decodeFile(File f){
    try {
        //Decode image size
        BitmapFactory.Options o = new BitmapFactory.Options();
        o.inJustDecodeBounds = true;
        BitmapFactory.decodeStream(new FileInputStream(f),null,o);

        //The new size we want to scale to
        final int REQUIRED_SIZE=70;

        //Find the correct scale value. It should be the power of 2.
        int scale=1;
        while(o.outWidth/scale/2>=REQUIRED_SIZE && o.outHeight/scale/2>=REQUIRED_SIZE)
            scale*=2;

        //Decode with inSampleSize
        BitmapFactory.Options o2 = new BitmapFactory.Options();
        o2.inSampleSize=scale;
        return BitmapFactory.decodeStream(new FileInputStream(f), null, o2);
    } catch (FileNotFoundException e) {}
    return null;
}

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