java - 重新编码图像时出现内存不足异常

Question

我正在尝试将图像编码为 64 base，

从图库中选择图像并尝试保存后，出现此错误:

内存不足异常

谁能建议如何在没有内存错误的情况下将此图像转换为 base 64？

        MotorImage.setOnClickListener(new View.OnClickListener() {

        @Override
        public void onClick(View arg0) {

            Intent i = new Intent(
                    Intent.ACTION_PICK,
                    android.provider.MediaStore.Images.Media.EXTERNAL_CONTENT_URI);

            startActivityForResult(i, RESULT_LOAD_IMAGE);
        }
    });
}


 @Override
  protected void onActivityResult(int requestCode, int resultCode, Intent data) {
super.onActivityResult(requestCode, resultCode, data);

if (requestCode == RESULT_LOAD_IMAGE && resultCode == RESULT_OK && null != data) {
    Uri selectedImage = data.getData();
    String[] filePathColumn = { MediaStore.Images.Media.DATA };

    Cursor cursor = getContentResolver().query(selectedImage,
            filePathColumn, null, null, null);
    cursor.moveToFirst();

    int columnIndex = cursor.getColumnIndex(filePathColumn[0]);
    String picturePath = cursor.getString(columnIndex);
    cursor.close();


 //   
   ImageView imageView = (ImageView) findViewById(R.id.imageView1);
    imageView.setImageBitmap(BitmapFactory.decodeFile(picturePath));



    String imageString = null;

    try {
        Bitmap bm = BitmapFactory.decodeFile(picturePath);

        ByteArrayOutputStream baos = new ByteArrayOutputStream();  
        bm.compress(Bitmap.CompressFormat.JPEG, 100, baos); //bm is the bitmap object  
        bm.recycle();
        byte[] b = baos.toByteArray();
        imageString = Base64.encodeToString(b, Base64.DEFAULT);
    } catch (Exception e) {
        e.printStackTrace();
    }




    Toast.makeText(getApplicationContext(), imageString, Toast.LENGTH_SHORT).show();

Answer 1

我怀疑您需要对图像进行缩放和重新采样以适应设备的限制，尝试这样的操作

// decodes image and scales it to reduce memory consumption
private Bitmap decodeImage(String picturePath) {
    try {
        File file = new File(picturePath);
        // Get image size
        BitmapFactory.Options opts = new BitmapFactory.Options();
        opts.inJustDecodeBounds = true;
        BitmapFactory.decodeStream(new FileInputStream(file), null, opts);

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

        // Find the correct scale value.
        int scale = 1;
        while (((opts.outWidth / scale) >> 1) >= MIN_SIZE
                && ((opts.outHeight / scale) >> 1) >= MIN_SIZE) {
            scale <<= 1;
        }

        BitmapFactory.Options opts2 = new BitmapFactory.Options();
        opts2.inSampleSize = scale;
        return BitmapFactory.decodeStream(new FileInputStream(file), null, opts2);
    } catch (FileNotFoundException e) {
    }
    return null;
}