Question

在ACTION_GET_CONTENT系统意图下选择图像后，我试图获取在onActivityResult返回的图像。我正在使用doc的“ setPic（）”方法来减小图像大小，但是由于某种原因，使用该方法时我什么也没得到。这是我的Intent，onActivityResulty和setPic（）方法-


private void requestPickingPhoto() {
    Intent intent = new Intent(Intent.ACTION_GET_CONTENT, MediaStore.Images.Media.EXTERNAL_CONTENT_URI);
    startActivityForResult(intent, PICK_VIDEO_REQUEST_CODE);
  }


  public void onActivityResult(int requestCode, int resultCode, Intent data) {
    super.onActivityResult(requestCode, resultCode, data);
    if (requestCode == PICK_VIDEO_REQUEST_CODE && resultCode == Activity.RESULT_OK) {
      Uri originalDataUri = data.getData();

      cachedLocalImageUri = originalDataUri;
      Timber.d("Receive image from: %s", originalDataUri);
      mImageSent.setImageURI(cachedLocalImageUri);
      setPic(originalDataUri.toString(), mImageSent);
    }
  }

  private void setPic(String imagePath, ImageView destination) {
    int targetW = destination.getWidth();
    int targetH = destination.getHeight();
    // Get the dimensions of the bitmap
    BitmapFactory.Options bmOptions = new BitmapFactory.Options();
    bmOptions.inJustDecodeBounds = true;
    BitmapFactory.decodeFile(imagePath, bmOptions);
    int photoW = bmOptions.outWidth;
    int photoH = bmOptions.outHeight;

    // Determine how much to scale down the image
    int scaleFactor = (int) Math.sqrt(Math.min(photoW/targetW, photoH/targetH));

    // Decode the image file into a Bitmap sized to fill the View
    bmOptions.inJustDecodeBounds = false;
    bmOptions.inSampleSize = scaleFactor;

    Bitmap bitmap = BitmapFactory.decodeFile(imagePath, bmOptions);
    destination.setImageBitmap(bitmap);
  }

我的目标是使用从意图中得到的Uri，以大幅降低图像分辨率，以便将其用于大小有限的Firebase云消息传递丰富的通知。

Answer 1

originalDataUri.toString()不会提供文件路径。
因此，您不能BitmapFactory.decodeFile(imagePath, bmOptions);。相反，一旦您从Uri打开流，就可以使用BitmapFactory.decodeStream(InputStream is)：

将您的String imagePath方法的参数setPic更改为Uri uri，而不是

BitmapFactory.decodeFile(imagePath, bmOptions);

执行此操作：

InputStream is = context.getContentResolver().openInputStream(uri);
BitmapFactory.decodeStream(is, null, bmOptions);

与方法末尾相同：代替

Bitmap bitmap = BitmapFactory.decodeFile(imagePath, bmOptions);

做

Bitmap bitmap = BitmapFactory.decodeStream(is, null, bmOptions);

请注意，您需要有效的Context。

缩小从ACTION_GET_CONTENT拍摄的图像将返回null

1 个答案: