如何修复位图上getWidth（）中的空错误[重复]

Question

在我的应用程序中，我想从 图库 中选择图像并压缩它。
对于压缩我使用这个库：https://github.com/zetbaitsu/Compressor

我为它写了下面的代码，但是当我运行应用程序并从图库中选择图像时，它会抛出 force close 并在 logCat 中显示以下错误：

我的活动代码：

    @Override
    public void onActivityResult(int requestCode, int resultCode, Intent data) {
        super.onActivityResult(requestCode, resultCode, data);
        if (resultCode == RESULT_OK) {
            if (requestCode == REQUEST_TAKE_PHOTO || requestCode == REQUEST_PICK_PHOTO) {
                if (data != null) {
                    // Get the Image from data
                    Uri selectedImage = data.getData();
                    String[] filePathColumn = {MediaStore.Images.Media.DATA};

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

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

                    postPath = mediaPath;
                    uploadImageToServer(postPath);
                }

            }
        } else if (resultCode != RESULT_CANCELED) {
        }
    }
}
    private void uploadImageToServer(String imagePath) {
        if (imagePath == null || imagePath.equals("")) {
            return;
        } else {
            showpDialog();
            Map<String, RequestBody> map = new HashMap<>();
            File file = new File(imagePath);
            try {
                compressedImage = new Compressor(getActivity())
                        .setMaxWidth(2000)
                        .setMaxHeight(1400)
                        .setQuality(90)
                        .setCompressFormat(Bitmap.CompressFormat.JPEG)
                        .setDestinationDirectoryPath(Environment.getExternalStoragePublicDirectory(
                                Environment.DIRECTORY_PICTURES).getAbsolutePath())
                        .compressToFile(file);
            } catch (IOException e) {
                e.printStackTrace();
            }
}

LogCat 错误：

Caused by: java.lang.NullPointerException: Attempt to invoke virtual method 'int android.graphics.Bitmap.getWidth()' on a null object reference
                                                                       at id.zelory.compressor.ImageUtil.decodeSampledBitmapFromFile(ImageUtil.java:70)
                                                                       at id.zelory.compressor.ImageUtil.compressImage(ImageUtil.java:33)
                                                                       at id.zelory.compressor.Compressor.compressToFile(Compressor.java:60)
                                                                       at id.zelory.compressor.Compressor.compressToFile(Compressor.java:56)
                                                                       at com.app.android.Fragments.NewAddressFragment.uploadImageToServer(NewAddressFragment.java:486)
                                                                       at com.app.android.Fragments.NewAddressFragment.onActivityResult(NewAddressFragment.java:353)
                                                                       at android.support.v4.app.FragmentActivity.onActivityResult(FragmentActivity.java:156)
                                                                       at android.app.Activity.dispatchActivityResult(Activity.java:7295)

显示此行的错误： .compressToFile(file);

更新：仅针对某些图像显示此错误，而不是所有图像！ 我该如何解决？请帮帮我

Answer 1

对GitHub 的另一个假设是，您可能会尝试将更改后的文件以原始名称存储在原始路径中。这也可能导致问题。请尝试此版本的代码。我加了compressedFileName。

private void uploadImageToServer(String imagePath) {
        if (imagePath == null || imagePath.equals("")) {
            return;
        } else {
            showpDialog();
            Map<String, RequestBody> map = new HashMap<>();
            File file = new File(imagePath);

            if(file != null && file.exists() && file.canRead()) {
                try {
                    String compressedFileName = "_" + file.getName();

                    compressedImage = new Compressor(getActivity())
                            .setMaxWidth(2000)
                            .setMaxHeight(1400)
                            .setQuality(90)
                            .setCompressFormat(Bitmap.CompressFormat.JPEG)
                            .setDestinationDirectoryPath(Environment.getExternalStoragePublicDirectory(
                                    Environment.DIRECTORY_PICTURES).getAbsolutePath())
                            .compressToFile(file, compressedFileName);
                } catch (IOException e) {
                    e.printStackTrace();
                }
            }

        }
}

Answer 2

请通过 try 和 catch 块处理并向用户显示对话框消息以选择另一个图像，可能是所选图像已损坏。

Answer 3

只要确保该文件不为空即可。

private void uploadImageToServer(String imagePath) {
        if (imagePath == null || imagePath.equals("")) {
            return;
        } else {
            showpDialog();
            Map<String, RequestBody> map = new HashMap<>();
            File file = new File(imagePath);

            if(file != null && file.exists() && file.canRead()) {
                try {
                    compressedImage = new Compressor(getActivity())
                            .setMaxWidth(2000)
                            .setMaxHeight(1400)
                            .setQuality(90)
                            .setCompressFormat(Bitmap.CompressFormat.JPEG)
                            .setDestinationDirectoryPath(Environment.getExternalStoragePublicDirectory(
                                    Environment.DIRECTORY_PICTURES).getAbsolutePath())
                            .compressToFile(file);
                } catch (IOException e) {
                    e.printStackTrace();
                }
            }

        }
}