Android,Glide图像加载库:NullPointerException,ProviderInfo

刚刚进入Android的Glide图像加载库。目前正在使用以下代码: https://github.com/bumptech/glide/issues/459

我的完整项目在这里,你想看看它:

https://github.com/mhurwicz/glide02

在Android Studio的模拟器中运行应用程序时,我遇到以下异常:

java.lang.NullPointerException: Attempt to invoke virtual method 'android.content.res.XmlResourceParser android.content.pm.ProviderInfo.loadXmlMetaData(android.content.pm.PackageManager, java.lang.String)' on a null object reference

这是MainActivity中的关键语句:

new ShareTask(this).execute("http://thelink");

( thelink 实际上 goo.gl/gEgYUd --无法将其保留在上面,因为stackoverflow不允许URL缩短器。)

这是我的ShareTask类代码

class ShareTask extends AsyncTask<String, Void, File> {
    private final Context context;

    public ShareTask(Context context) {
        this.context = context;
    }
    @Override protected File doInBackground(String... params) {
        String url = params[0]; // should be easy to extend to share multiple images at once
        try {
            return Glide
                    .with(context)
                    .load(url)
                    .downloadOnly(Target.SIZE_ORIGINAL, Target.SIZE_ORIGINAL)
                    .get() // needs to be called on background thread
                    ;
        } catch (Exception ex) {
            Log.w("SHARE", "Sharing " + url + " failed", ex);
            return null;
        }
    }
    @Override protected void onPostExecute(File result) {
        if (result == null) { return; }
        Uri uri = FileProvider.getUriForFile(context, context.getPackageName(), result);
        share(uri); // startActivity probably needs UI thread
    }

    private void share(Uri result) {
        Intent intent = new Intent(Intent.ACTION_SEND);
        intent.setType("image/jpeg");
        intent.putExtra(Intent.EXTRA_SUBJECT, "Shared image");
        intent.putExtra(Intent.EXTRA_TEXT, "Look what I found!");
        intent.putExtra(Intent.EXTRA_STREAM, result);
        context.startActivity(Intent.createChooser(intent, "Share image"));
    }
}

使用debug,我可能会在 get() 陈述首先,宽度和高度是非常大的负数。(请参见下面以绿色突出显示的代码。)然后 获取() 语句返回 null (请参见下面以红色突出显示的代码。)

提前感谢您提供的任何帮助!