小编Mor*_*ver的帖子

我只是从安装了Android 5.0.1的华为设备获得此例外:

Fatal Exception: java.lang.RuntimeException: Unable to start activity ComponentInfo{net.example.app/net.example.app.view.PreferencesActivity}: java.lang.RuntimeException: Content has view with id attribute 'android.R.id.list_container' that is not a ViewGroup class
       at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2406)
       at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2466)
       at android.app.ActivityThread.access$1200(ActivityThread.java:152)
       at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1341)
       at android.os.Handler.dispatchMessage(Handler.java:102)
       at android.os.Looper.loop(Looper.java:135)
       at android.app.ActivityThread.main(ActivityThread.java:5538)
       at java.lang.reflect.Method.invoke(Method.java)
       at java.lang.reflect.Method.invoke(Method.java:372)
       at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:960)
       at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:755)
Caused by java.lang.RuntimeException: Content has view with id attribute 'android.R.id.list_container' that is not a ViewGroup class
       at android.support.v14.preference.PreferenceFragment.onCreateView(PreferenceFragment.java:278)
       at android.app.Fragment.performCreateView(Fragment.java:2059)
       at android.app.FragmentManagerImpl.moveToState(FragmentManager.java:899)
       at android.app.FragmentManagerImpl.moveToState(FragmentManager.java:1076)
       at android.app.BackStackRecord.run(BackStackRecord.java:833)
       at android.app.FragmentManagerImpl.execPendingActions(FragmentManager.java:1461)
       at android.app.Activity.performStart(Activity.java:6031)
       at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2369)
       at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2466) …

我正在尝试返回请求的图像文件。我的客户端正在下载文件，但我无法显示它，因为它是无效png文件。如果我打开存储的文件tmpFile.png，我可以正确地看到它。所以可能问题在于我如何将它发送回要求它的客户。

// This is my controller
async getFile(@Param('bucketname') bucketName: string,
            @Param('filename') fileName: string) {
return await this.appService.getFile(bucketName, fileName);


// This is the function called
getFile(bucketName: string, fileName: string) {
    return new Promise(resolve => {
      this.minioClient.getObject(bucketName, fileName, (e, dataStream) => {
        if (e) {
          console.log(e);
        }

        let size = 0;
        const binary = fs.createWriteStream('tmpFile.png');

        dataStream.on('data', chunk => {
          size += chunk.length;
          binary.write(chunk);
        });
        dataStream.on('end', () => {
          binary.end();
          resolve(binary);
        });
      });
    });
  }