Question

我的相对布局有两个子Rcyclerview（不可见）和进度条。

我想要的是：布局的创建，recyclelerview到隐形和进度条显示，直到AsyncTask（从SD文件夹中获取图像）完成，并且recyclerview可见且进度条不可见。

正在发生的事情：我的应用未显示进度条。在asyctask完成后，我的recyclerview出现了。

XML：

 <RelativeLayout
                android:layout_width="match_parent"
                android:layout_height="match_parent"
                android:layout_below="@+id/view3">

                <android.support.v7.widget.RecyclerView
                    android:layout_width="match_parent"
                    android:layout_height="wrap_content"
                    android:paddingTop="5dp"
                    android:divider="@null"
                    android:visibility="invisible"
                    android:id="@+id/recycler_view_cameragallery"
                    android:dividerHeight="0dp"
                    android:fadingEdge="none" />

                <ProgressBar
                    android:layout_width="wrap_content"
                    android:layout_height="wrap_content"
                    android:id="@+id/progressBar_Gallery"
                    style="?android:attr/progressBarStyleLarge"
                    android:layout_centerInParent="true"
                    android:layout_gravity="center"
                    android:padding="12dp" />
            </RelativeLayout>

ActivityCode：

public View onCreateView(LayoutInflater inflater,@Nullable ViewGroup container,@Nullable Bundle savedInstanceState){

        View rootView=inflater.inflate(R.layout.camera_layout,container,false);
        rootView.setLayoutParams(new ViewGroup.LayoutParams(ViewGroup.LayoutParams.MATCH_PARENT,
                ViewGroup.LayoutParams.MATCH_PARENT));
        ButterKnife.inject(this,rootView);
        init();
        initialise(rootView);
        initialiseListeners();
        listofImagesPath = new ArrayList<String>();
        new mediaScanAyscTask().executeOnExecutor(AsyncTask.THREAD_POOL_EXECUTOR);}

的AsyncTask

public class mediaScanAyscTask extends AsyncTask<Void,Void,Void>{

        @Override
        protected Void doInBackground(Void... params) {

            return null;
        }

        @Override
        protected void onPreExecute() {
            super.onPreExecute();
            adapter.clearApplications();
            galleryProgressBar.setVisibility(View.VISIBLE);
            galleryProgressBar.getIndeterminateDrawable().setColorFilter(Color.parseColor("#ff4081"), PorterDuff.Mode.MULTIPLY);
            cameraRecyclerView.setVisibility(View.INVISIBLE);

        }

        @Override
        protected void onPostExecute(Void aVoid) {
            listofImagesPath = RetriveCapturedImagePath();

            if(listofImagesPath!=null){
                adapter.addApplications(listofImagesPath);
            }
            galleryProgressBar.setVisibility(View.INVISIBLE);
            cameraRecyclerView.setVisibility(View.VISIBLE);
            super.onPostExecute(aVoid);
        }
    }

请突出我错在哪里帮助我。

Answer 1

在我的情况下，模拟器在开发者模式下关闭了动画，因此我看不到进度条。

Answer 2

让你的布局消失而不是隐形

Answer 3

我希望这个答案可以帮到你。

@Override
protected void onPostExecute(Void aVoid) {
    listofImagesPath = RetriveCapturedImagePath();
        if(listofImagesPath!=null){
            adapter.addApplications(listofImagesPath);
        }
    galleryProgressBar.setVisibility(View.GONE);
    cameraRecyclerView.setVisibility(View.VISIBLE);
    super.onPostExecute(aVoid);
}

第二个选项是从ProgressBar文件中删除.xml并以编程方式创建。

class YourClassName extends AsyncTask<String, Void, Boolean>{
    ProgressDialog dialog;  

    @Override
    protected void onPreExecute() {
        super.onPreExecute();
        dialog = new ProgressDialog(Detail_Activity.this);
        dialog.setTitle("your title");
        dialog.setMessage("your message");
        dialog.setCancelable(false);
        dialog.show();
    }

    @Override
    protected Boolean doInBackground(String... params) {
        return null;
    }

    @Override
    protected void onPostExecute(Boolean aBoolean) {
        super.onPostExecute(aBoolean);
        dialog.cancel();
    }
}

Answer 4

我遇到了同样的问题，原因是ProgressBar位于RecyclerView的底部。您需要将RecyclerView和ProgressBar打包到FrameLayout。

<RelativeLayout
                android:layout_width="match_parent"
                android:layout_height="match_parent"
                android:layout_below="@+id/view3">
         <FrameLayout
                android:layout_width="match_parent"
                android:layout_height="match_parent">

                <android.support.v7.widget.RecyclerView
                    android:layout_width="match_parent"
                    android:layout_height="wrap_content"
                    android:paddingTop="5dp"
                    android:divider="@null"
                    android:visibility="invisible"
                    android:id="@+id/recycler_view_cameragallery"
                    android:dividerHeight="0dp"
                    android:fadingEdge="none" />

                <ProgressBar
                    android:layout_width="wrap_content"
                    android:layout_height="wrap_content"
                    android:id="@+id/progressBar_Gallery"
                    style="?android:attr/progressBarStyleLarge"
                    android:layout_centerInParent="true"
                    android:layout_gravity="center"
                    android:padding="12dp" />
        </FrameLayout>
  </RelativeLayout>

Answer 5

Try this
<ProgressBar
    style="@android:style/Widget.ProgressBar.Horizontal"
    android:layout_width="match_parent"
    android:layout_height="wrap_content"
    android:progress="100"
    android:id="@+id/progress"/>

ProgressBar没有显示

5 个答案: