Question

我尝试使用getLayoutParams()将片段中的视图与其父AppCompatActivity中的视图对齐

RelativeLayout.LayoutParams params = (RelativeLayout.LayoutParams) viewImAligning.getLayoutParams();
        params.addRule(RelativeLayout.BELOW, R.id.video_view_from_appCompat);
        viewImAligning.setLayoutParams(params);

我正确地在片段上初始化R.id.video_view_from_appCompat，因为我可以从Fragment的setUserVisibleHint方法获得它的宽度/高度等。但是，无论我在片段的生命周期中放置viewImAligning

，我都无法video_view_from_appCompat与viewImAligning.setLayoutParams(params);对齐

目前，我正在使用getLocationsOnScreen

进行hacky变通方法

        int [] generatedLocations = new int[2];
        locations = generatedLocations;

        videoViewFromAppCompat.getLocationOnScreen(locations);
        int x = locations[0];
        int y = locations[1];
        viewImAligning.setY(y);

虽然hacky解决方法可以解决问题，但我想了解为什么我没有让getLayoutParams工作。

编辑：代码和XML（含有AsyncTask的意大利面条代码包括与它有关的内容

public abstract class VideoIntro extends AppCompatActivity{

private LinearLayout videoViewFromAppCompat;

@Override
final protected void onCreate(Bundle savedInstanceState) {
    requestWindowFeature(Window.FEATURE_NO_TITLE);
    super.onCreate(savedInstanceState);
    setContentView(R.layout.video_intro_layout_test);
    new LoadContestTask().execute();

}

private  class  LoadContestTask extends AsyncTask<Object, Object, Object> {
    ProgressDialog pDialog;

    @Override
    protected void onPreExecute() {
    ...

    }

    @Override
    protected Object doInBackground(Object... params) {
        initialize();
        return true;
    }

    protected void onPostExecute(Object result) {
        loadContent();
        pDialog.dismiss();
    }
}

    private void initialize() {
    ...
    videoViewFromAppCompat = (LinearLayout) findViewById(video_view_from_appCompat);
}
...
}

video_intro_layout_test

的XML

<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
  android:layout_width="fill_parent"
  android:layout_height="wrap_content"
>
<SurfaceView
   android:layout_width="0px"
   android:layout_height="0px" />
<LinearLayout
    android:id="@+id/video_view_from_appCompat"
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:layout_below="@+id/top"
    android:paddingLeft="45dp"
    android:paddingRight="45dp"
    android:paddingTop="36dp"
    android:visibility="invisible">
<VideoView
    android:id="@+id/video"
    android:layout_width="match_parent"
    android:layout_height="wrap_content"
     />
</LinearLayout>

<com.my_test.app.CustomViewPager
    android:id="@+id/view_pager"
    android:layout_width="fill_parent"
    android:layout_height="wrap_content">
</com.my_test.app.CustomViewPager>

片段代码

@Override
public void onCreate(@Nullable Bundle savedInstanceState) {
    videoViewFromAppCompat = (LinearLayout) getActivity().findViewById(R.id.video_view_from_appCompat);

}

@Override
public View onCreateView(LayoutInflater inflater, @Nullable ViewGroup container, @Nullable Bundle savedInstanceState) {
    View v = inflater.inflate(R.layout.fragment_layout, container, false);
    viewImAligning = (RelativeLayout) v.findViewById(R.id.view_im_aligning);

}

@Override
public void setUserVisibleHint(boolean isVisibleToUser) {
    super.setUserVisibleHint(isVisibleToUser);
    if (isVisibleToUser ) 
    RelativeLayout.LayoutParams params = (RelativeLayout.LayoutParams) viewImAligning.getLayoutParams();
    params.addRule(RelativeLayout.BELOW, R.id.video_view_from_appCompat);
    viewImAligning.setLayoutParams(params);

Answer 1

我想我明白了。您正尝试将作为Fragment（R.id.view_im_aligning）基本视图的视图与R.id.video_view_from_appCompat内属于您{{1}的视图（RelativeLayout）对齐}}。问题是它们不共享同一个父级，这就是导致代码失败的原因。

我建议如下 - 如果您需要在video_view_from_appCompat下方显示专用片段，请添加Activity以包含片段，将片段添加到该视图中。之后，您可以将FrameLayout对齐到video_view_from_appCompat。

之下

所以你的xml看起来有点像：

FrameLayout

将片段中的视图与父AppCompatActivity中的视图对齐

1 个答案: