如何使用位图工厂压缩图像而不降低相机的质量？ [英] How to use bitmap factory to compress image without reduce the quality taken from camera?

问题描述

我从相机拍摄了3张图片，我想设置为3张ImageView。但它会抛出OutOfMemory，因为图像尺寸很大。我已经读过位图工厂可以在不降低质量的情况下压缩尺寸。问题是我不知道该怎么做。

这是我的onClick按钮：

  openCameraButton.setOnClickListener（new View.OnClickListener（）{
 @Override 
 public void onClick（View view）{
 Intent intent = new Intent（MediaStore.ACTION_IMAGE_CAPTURE ）; 
 file = new File（Environment.getExternalStorageDirectory（），
imagename.jpg）; 
 outPutfileUri = Uri.fromFile（file）; 
 intent.putExtra（MediaStore） .EXTRA_OUTPUT，outPutfileUri）; 
 startActivityForResult（intent，0）; 
 dialog.cancel（）; 
} 
}）; 
  

这是我的onActivityResult：

  @Override 
 public void onActivityResult（int requestCode，int resultCode，Intent data）{
 super.onActivityResult（requestCode，resultCode，data）; 
 //来自相机的结果
尝试{
 if（requestCode == 0&& resultCode == RESULT_OK）{
 // bitmap =（Bitmap）data.getExtras（ ）获得（ 数据）; 
 bitmap = MediaStore.Images.Media.getBitmap（getActivity（）。getContentResolver（），outPutfileUri）; 
 drawable = new BitmapDrawable（getResources（），bitmap）; 
 imageSelfie.setImageDrawable（drawable）; 
} 
} catch（忽略异常）{}} 
  

任何人都可以提供帮助我？

解决方案

而不是使用试图为您提供完整位图的媒体商店，您最好打开输入流并加载调整大小来自它的位图。

  InputStream is = getContentResolver（）。openInputStream（outPutfileUri）; 
  

然后使用带有选项参数的BitmapFactory.decodeStream（），您可以多次缩小图像。 / p>

I have 3 images taken from camera and I want to set to 3 ImageView. But it throws OutOfMemory because the image has large size. I've read that bitmap factory can compress the size without reducing the quality. The problem is I don't know how to do that.

This is my onClick Button:

openCameraButton.setOnClickListener(new View.OnClickListener() {
                @Override
                public void onClick(View view) {
                    Intent intent = new Intent(MediaStore.ACTION_IMAGE_CAPTURE);
                    file = new File(Environment.getExternalStorageDirectory(),
                            "imagename.jpg");
                    outPutfileUri = Uri.fromFile(file);
                    intent.putExtra(MediaStore.EXTRA_OUTPUT, outPutfileUri);
                    startActivityForResult(intent,0);
                    dialog.cancel();
                }
            });

And this is my onActivityResult:

@Override
public void onActivityResult(int requestCode, int resultCode, Intent data) {
    super.onActivityResult(requestCode, resultCode, data);
        //result from camera
    try{
        if (requestCode==0 && resultCode==RESULT_OK){
            //bitmap = (Bitmap)data.getExtras().get("data");
            bitmap = MediaStore.Images.Media.getBitmap(getActivity().getContentResolver(), outPutfileUri);
            drawable = new BitmapDrawable(getResources(), bitmap);
            imageSelfie.setImageDrawable(drawable);
        }
    } catch (Exception ignored){}}

Anyone can help me?

解决方案

Instead of using the media store which tries to give you a full bitmap you better open an inputstream and load a resized bitmap from it.

InputStream is = getContentResolver().openInputStream(outPutfileUri);

Then use BitmapFactory.decodeStream() with an options parameter where you scale down the image several times.

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