提取SD卡中的图片

读取SD卡的权限

<uses-permission android:name="android.permission.READ_EXTERNAL_STORAGE"/>

系统跳转

startActivityForResult(new Intent(Intent.ACTION_PICK).setType("image/*"),PICK_CODE);

回来后取得图片

 @Override
    protected void onActivityResult(int requestCode, int resultCode, Intent data) {
        if(requestCode==PICK_CODE){
            if(data!=null){
//                获取图片地址
//              
                Cursor cursor=getContentResolver().query(data.getData(), null, null, null, null);
                cursor.moveToFirst();
                currentPhotoStr=cursor.getString(cursor.getColumnIndex(MediaStore.Images.ImageColumns.DATA));
                cursor.close();
//              压缩图片
                resizePhoto();
                imageView.setImageBitmap(photoImage);
            }
        }
    }

压缩图片

private void resizePhoto() {
    BitmapFactory.Options options=new BitmapFactory.Options();
    options.inJustDecodeBounds=true;
    BitmapFactory.decodeFile(currentPhotoStr,options);
    double ratio=Math.max(options.outWidth*1.0d/1024f,options.outHeight*1.0d/1024f);
    options.inSampleSize=(int)Math.ceil(ratio);
    options.inJustDecodeBounds=false;
    photoImage= BitmapFactory.decodeFile(currentPhotoStr, options);
}