Question

简而言之，我有一个我正在研究的应用程序需要能够拍摄图像并上传它们。在上传它们之前，我想在屏幕上显示它们。理想情况下，我应该可以使用图库从手机存储中加载图像，或者拍照并直接上传。

我可以拍摄照片并在没有问题的情况下在ImageView中显示。我可以从库中加载图像，但只有那些从某些外部源下载的图像才会显示在ImageView中。例如，如果我上周用相机拍了一张照片并想用画廊选择它，它就不会加载; ImageView只是空白而没有错误。对于我用相机拍摄的每张图像都是这种情况;如果我尝试使用图库加载它不起作用，但如果我使用它们加载其他图像，他们的工作。我无法弄清楚为什么会这样，所以我会在这里提供一些相关的代码，并希望有人能帮助我。

Intent pickPhoto = new Intent(Intent.ACTION_PICK,
                    android.provider.MediaStore.Images.Media.EXTERNAL_CONTENT_URI);
startActivityForResult(pickPhoto , 1);

onActivityResult中的代码，它正在加载图像并尝试显示它：

            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 imageBitmap = (Bitmap) BitmapFactory.decodeFile(picturePath);

            imageview.setImageBitmap(imageBitmap);

Answer 1

private void chooseImageFromGalery() {
    Intent intent = new Intent(Intent.ACTION_PICK, android.provider.MediaStore.Images.Media.EXTERNAL_CONTENT_URI);
    intent.setType("image/*");
    startActivityForResult(Intent.createChooser(intent, "Choose Image"), 101);
}

if (requestCode == 101 && resultCode == Activity.RESULT_OK) {
        Uri selectedImageUri = data.getData();
        try {
            photoFile = createImageFile();
        } catch (IOException e1) {
            e1.printStackTrace();
        }
        try {
            copyFile(new File(getRealPathFromURI(data.getData())), photoFile);
        } catch (IOException e) {
            e.printStackTrace();
        }
        refreshFragmentData();
    }
private void copyFile(File sourceFile, File destFile) throws IOException {
    if (!sourceFile.exists()) {
        return;
    }

    FileChannel source = null;
    FileChannel destination = null;
    source = new FileInputStream(sourceFile).getChannel();
    destination = new FileOutputStream(destFile).getChannel();
    if (destination != null && source != null) {
        destination.transferFrom(source, 0, source.size());
    }
    if (source != null) {
        source.close();
    }
    if (destination != null) {
        destination.close();
    }

}

private String getRealPathFromURI(Uri contentUri) {
    String[] proj = { MediaStore.Video.Media.DATA };
    Cursor cursor = getActivity().managedQuery(contentUri, proj, null, null, null);
    int column_index = cursor.getColumnIndexOrThrow(MediaStore.Images.Media.DATA);
    cursor.moveToFirst();
    return cursor.getString(column_index);
}

private File createImageFile() throws IOException {
    // Create an image file name
    String timeStamp = new SimpleDateFormat("yyyyMMdd_HHmmss").format(new Date());
    String imageFileName = "JPEG_" + timeStamp + "_";
    File storageDir = new File(CommonParams.MASTER_STORAGE_PATH + "/" + CommonParams.categorySelected);
    File image = File.createTempFile(imageFileName, /* prefix */
            ".jpg", /* suffix */
            storageDir /* directory */
    );

    // Save a file: path for use with ACTION_VIEW intents
    mCurrentPhotoPath = "file:" + image.getAbsolutePath();
    return image;
}

希望这可以帮到你。

Answer 2

                Intent pickPhoto = new Intent(
                                Intent.ACTION_PICK,
                                android.provider.MediaStore.Images.Media.EXTERNAL_CONTENT_URI);
                        pickPhoto.setType("image/*");
                        startActivityForResult(pickPhoto, 1);

onActivityResult中的代码，它加载图像并尝试显示它：

              Intent imageReturnedIntent;
            Uri selectedImage = data.getData();
            String[] filePathColumn = { MediaColumns.DATA };
            Cursor cursor = getContentResolver().query(selectedImage,
                    filePathColumn, null, null, null);
            cursor.moveToFirst();
            int columnIndex = cursor.getColumnIndex(filePathColumn[0]);
            String filePath = cursor.getString(columnIndex);
            File mFile = new File(filePath);
            cursor.close();
            BitmapFactory.Options options = new BitmapFactory.Options();
             options.inSampleSize = 2;
           Bitmap bp = BitmapFactory.decodeFile(filePath, options);

Android：通过图库加载的相机图像不会在ImageView中显示

2 个答案: