某些设备中的位图更改大小错误

Question

我创建了 activity 可以从图库中挑选照片（有意）并调整挑选照片的大小并放入按钮（在 Drawable 对象中）

Activity一些方法：

protected void onActivityResult(int requestCode, int resultCode,
                                Intent imageReturnedIntent) {
    super.onActivityResult(requestCode, resultCode, imageReturnedIntent);

    switch(requestCode) {
        case PICK_PHOTO_FOR_AVATAR:
            if(resultCode == RESULT_OK){
                Uri selectedImage = imageReturnedIntent.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 filePath = cursor.getString(columnIndex);
                cursor.close();
                Bitmap yourSelectedImage = BitmapFactory.decodeFile(filePath);

                try{

                    if(density>=4) {//xxxdpi
                        setButtonIcon(Photos.changeSize(yourSelectedImage, 196, 196), tempButton);
                    }else if (density < 4 && density >= 3) {//xxdpi
                        setButtonIcon(Photos.changeSize(yourSelectedImage, 180, 180), tempButton);
                        Toast.makeText(context, density + "", Toast.LENGTH_SHORT).show();
                    } else if (density < 3 && density >= 2) {//xdpi
                        setButtonIcon(Photos.changeSize(yourSelectedImage,96,96), tempButton);
                        Toast.makeText(context, density + "", Toast.LENGTH_SHORT).show();
                    } else if (density < 2 && density >= 1.5) {//hdpi
                         setButtonIcon(Photos.changeSize(yourSelectedImage,72,72), tempButton);
                        Toast.makeText(context, density + "", Toast.LENGTH_SHORT).show();
                    } else if (density < 1.5 && density >= 1) {//mdpi
                         setButtonIcon(Photos.changeSize(yourSelectedImage,48,48), tempButton);
                        Toast.makeText(context, density + "", Toast.LENGTH_SHORT).show();
                    } else if (density < 1 && density >= 0.75) {//ldpi
                         setButtonIcon(Photos.changeSize(yourSelectedImage,36,36), tempButton);
                        Toast.makeText(context, density + "", Toast.LENGTH_SHORT).show();
                    }
                }catch (Exception e){
                      Toast.makeText(context,density+" "+e.getMessage(),Toast.LENGTH_SHORT).show();
                }


            }
            break;

    }
}

private void setButtonIcon(Bitmap icon,DocumentButton btn) {
    Drawable draw=new BitmapDrawable(getResources(),icon);
    btn.setCompoundDrawablesWithIntrinsicBounds(null, draw , null, null);
}

它可以在某些设备上工作，但是当我在三星 Galaxy S6（密度为 4.0）中进行测试时，出现了这个错误

Attempt to invoke virtual method 'int android.graphics.Bitmap.getWidth()

当我想调整位图照片的大小时出现此错误:

public static Bitmap changeSize(Bitmap bitmap,int newWidth,int newHeight)throws Exception{

    return Bitmap.createScaledBitmap(bitmap, newWidth, newHeight, false);

}

我该如何解决这个问题？

Answer 1

我解决了我的问题，我只更改了一些代码行，我认为 Cursor 是我的问题，在 android 5 和更高版本中，Cursor 无法获取图像路径（路径结果 = null）

更新行：

final Uri imageUri = imageReturnedIntent.getData();
final InputStream imageStream = getContentResolver().openInputStream(imageUri);
final Bitmap yourSelectedImage = BitmapFactory.decodeStream(imageStream);

某些设备中的位图更改大小错误

Error on bitmap change size in some Devices

android

resize

runtime-error

bitmap