Question

当我尝试选择图像时，文件追踪器会显示“相机”。和＆＃39;文件＆＃39;，如果我没有选择一个并点击，它会崩溃？我试过几个答案，但我是webdev而不是android dev。救命啊！

这类似于app crashes when going back from gallery without selecting any image

@Override
public void onActivityResult(int requestCode, int resultCode, Intent data) {
    if (requestCode != INPUT_FILE_REQUEST_CODE || mUploadMessage == null) {
       super.onActivityResult(requestCode, resultCode, data);
        return;
    }
    try {
        String file_path = mCameraPhotoPath.replace("file:","");
        File file = new File(file_path);
        size = file.length();

    }catch (Exception e){
        Log.e("Error!", "Error while opening image file" + e.getLocalizedMessage());
    }

    if (data != null || mCameraPhotoPath != null) {
        Integer count = 1;
        ClipData images = null;
        try {
            images = data.getClipData();
        }catch (Exception e) {
            Log.e("Error!", e.getLocalizedMessage());
        }

        if (images == null && data != null && data.getDataString() != null) {
                count = data.getDataString().length();
        } else if (images != null) {
                count = images.getItemCount();
        }
        Uri[] results = new Uri[count];
        // Check that the response is a good one
        if (resultCode == Activity.RESULT_OK) {
            if (size != 0) {
                // If there is not data, then we may have taken a photo
                if (mCameraPhotoPath != null) {
                    results = new Uri[]{Uri.parse(mCameraPhotoPath)};
                }
            } else if (data.getClipData() == null) {
                results = new Uri[]{Uri.parse(data.getDataString())};
            } else {

                for (int i = 0; i < images.getItemCount(); i++) {
                    results[i] = images.getItemAt(i).getUri();
                }
            }
        }

        mUploadMessage.onReceiveValue(results);
        mUploadMessage = null;
    }
}

Answer 1

在进行计算之前，您尚未在resultCode进行任何onActivityResult导向检查。当您在没有选择图像的情况下返回时，resultCode为RESULT_CANCELLED且您的data为空。发布data上的任何操作将始终导致空指针异常

执行以下操作 -

if (resultCode==RESULT_OK){
  // do stuff here that is the part of your try catch block
}

当您尝试对不存在的数据执行data.getDataString（）时，大多数代码都会崩溃。并且考虑到这是在你的try块之外它永远不会被抓住并且应用程序崩溃。

应用程序崩溃时“不是＆＃39;从文件选择/图库中选择图像

1 个答案: