直播app开发搭建，Android studio 图片压缩

获取图片目录

File file=Environment.getExternalStorageDirectory();//获取根路径 storage/emulated/0<br>String path1=file.getPath()+"/Pictures/1655215651628.jpg";//Pictures文件夹下面的 1655215651628.jpg图片名<br> 

例

<br>     //path 压缩图片的路径<br>        String path="/storage/emulated/0/Pictures/1655215651628.jpg";<br>        Bitmap bitmap = obtainImageFromPath(path, 100, 160);<br>        saveBitmapFile(bitmap);//把压缩图片储存<br>        image.setImageBitmap(bitmap);<br> //传入路径和宽高<br>    public static Bitmap obtainImageFromPath(String path, int width, int height) {<br>        BitmapFactory.Options o = new BitmapFactory.Options();<br>        o.inJustDecodeBounds = true;<br>        BitmapFactory.decodeFile(path, o);<br>        o.inSampleSize = calculateSampleSize(o, width, height);<br>        o.inJustDecodeBounds = false;<br>        return BitmapFactory.decodeFile(path, o);<br>    }<br>    //计算样本量<br>    private static int calculateSampleSize(BitmapFactory.Options o, int reqWidth, int reqHeight) {<br>        int sampleSize = 1;<br>        if (o.outWidth > reqWidth || o.outHeight > reqHeight) {<br>            final int halfWidth = o.outWidth / 2;<br>            final int halfHeight = o.outHeight / 2;<br>            while ((halfHeight / sampleSize) >= reqHeight<br>                    && (halfWidth / sampleSize) >= reqWidth) {<br>                sampleSize *= 2;<br>            }<br>        }<br>        return sampleSize;<br>    }<br>//保存压缩的文件<br>    public void saveBitmapFile(Bitmap bitmap){<br>        File file=new File("/storage/emulated/0/Pictures/1655215651628.jpg");//将要保存图片的路径，图片的大小已经改变<br>        try {<br>            BufferedOutputStream bos = new BufferedOutputStream(new FileOutputStream(file));<br>            bitmap.compress(Bitmap.CompressFormat.JPEG, 100, bos);<br>            bos.flush();<br>            bos.close();<br>        } catch (IOException e) {<br>            e.printStackTrace();<br>        }<br>    }

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