Question

在我的应用中，我在活动B 中构建了一个相机功能。然后，所选图片将放置在imageView B 中。

活动B ---＆gt;一个imageView B，用于放置所选图像

所选图像可以显示在ImageView B 上，但看起来很模糊。请告诉我该怎么办。提前致谢！

活动B

 private void activeGallery() {
      Intent intent = new Intent(Intent.ACTION_PICK,
      android.provider.MediaStore.Images.Media.EXTERNAL_CONTENT_URI);
      startActivityForResult(intent, RESULT_LOAD_IMAGE);
      }


   @Override
      protected void onActivityResult(int requestCode, int resultCode,Intent data) {
           super.onActivityResult(requestCode, resultCode, data);
           switch (requestCode) {
           case RESULT_LOAD_IMAGE:
          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();
                  Bitmap a = (BitmapFactory.decodeFile(picturePath));
                  photo=scaleBitmap(a,200,200);
                  imageView.setImageBitmap(photo);
                      }
              }
          }

        public static Bitmap scaleBitmap(Bitmap bitmap, int wantedWidth, int wantedHeight) {
            int width = bitmap.getWidth();
            int height = bitmap.getHeight();
            float scaleWidth = ((float) wantedWidth) / width;
            float scaleHeight = ((float) wantedHeight) / height;
         // create a matrix for the manipulation
            Matrix matrix = new Matrix();
        // resize the bit map
          matrix.postScale(scaleWidth, scaleHeight);
          // recreate the new Bitmap
            Bitmap resizedBitmap = Bitmap.createScaledBitmap(bitmap, wantedWidth, wantedHeight, false);
        return resizedBitmap;
        }

原始图片

放置在ImageView B中（看起来模糊）

Answer 1

如何修复imageView的大小？

你可以试试这个

<ImageView
        android:id="@+id/YourImageViewId"
        android:layout_width="100dp"
        android:layout_height="100dp"
        android:layout_alignParentRight="true"
        android:scaleType="centerInside"
        android:gravity="right|center_vertical"
        android:padding="10px"
        />

来自here

的来源

如何使图像缩放效率？

1 个答案: