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      1 /*
      2  * Copyright (C) 2015 The Android Open Source Project
      3  *
      4  * Licensed under the Apache License, Version 2.0 (the "License");
      5  * you may not use this file except in compliance with the License.
      6  * You may obtain a copy of the License at
      7  *
      8  *      http://www.apache.org/licenses/LICENSE-2.0
      9  *
     10  * Unless required by applicable law or agreed to in writing, software
     11  * distributed under the License is distributed on an "AS IS" BASIS,
     12  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
     13  * See the License for the specific language governing permissions and
     14  * limitations under the License.
     15  */
     16 
     17 package com.android.packageinstaller.permission.ui.handheld;
     18 
     19 import android.os.Bundle;
     20 import android.preference.PreferenceFragment;
     21 import android.view.LayoutInflater;
     22 import android.view.View;
     23 import android.view.ViewGroup;
     24 import android.view.animation.Animation;
     25 import android.view.animation.Animation.AnimationListener;
     26 import android.view.animation.AnimationUtils;
     27 import android.widget.ListView;
     28 import android.widget.TextView;
     29 import com.android.packageinstaller.R;
     30 
     31 public abstract class PermissionsFrameFragment extends PreferenceFragment {
     32     private ViewGroup mPreferencesContainer;
     33 
     34     private View mLoadingView;
     35     private ViewGroup mPrefsView;
     36     private boolean mIsLoading;
     37 
     38     /**
     39      * Returns the view group that holds the preferences objects. This will
     40      * only be set after {@link #onCreateView} has been called.
     41      */
     42     protected final ViewGroup getPreferencesContainer() {
     43         return mPreferencesContainer;
     44     }
     45 
     46     @Override
     47     public View onCreateView(LayoutInflater inflater, ViewGroup container,
     48             Bundle savedInstanceState) {
     49         ViewGroup rootView = (ViewGroup) inflater.inflate(R.layout.permissions_frame, container,
     50                         false);
     51         mPrefsView = (ViewGroup) rootView.findViewById(R.id.prefs_container);
     52         if (mPrefsView == null) {
     53             mPrefsView = rootView;
     54         }
     55         mLoadingView = rootView.findViewById(R.id.loading_container);
     56         mPreferencesContainer = (ViewGroup) super.onCreateView(
     57                 inflater, mPrefsView, savedInstanceState);
     58         setLoading(mIsLoading, false, true /* force */);
     59         mPrefsView.addView(mPreferencesContainer);
     60         return rootView;
     61     }
     62 
     63     protected void setLoading(boolean loading, boolean animate) {
     64         setLoading(loading, animate, false);
     65     }
     66 
     67     private void setLoading(boolean loading, boolean animate, boolean force) {
     68         if (mIsLoading != loading || force) {
     69             mIsLoading = loading;
     70             if (getView() == null) {
     71                 // If there is no created view, there is no reason to animate.
     72                 animate = false;
     73             }
     74             if (mPrefsView != null) {
     75                 setViewShown(mPrefsView, !loading, animate);
     76             }
     77             if (mLoadingView != null) {
     78                 setViewShown(mLoadingView, loading, animate);
     79             }
     80         }
     81     }
     82 
     83     @Override
     84     public ListView getListView() {
     85         ListView listView = super.getListView();
     86         if (listView.getEmptyView() == null) {
     87             TextView emptyView = (TextView) getView().findViewById(R.id.no_permissions);
     88             listView.setEmptyView(emptyView);
     89         }
     90         return listView;
     91     }
     92 
     93     private void setViewShown(final View view, boolean shown, boolean animate) {
     94         if (animate) {
     95             Animation animation = AnimationUtils.loadAnimation(getContext(),
     96                     shown ? android.R.anim.fade_in : android.R.anim.fade_out);
     97             if (shown) {
     98                 view.setVisibility(View.VISIBLE);
     99             } else {
    100                 animation.setAnimationListener(new AnimationListener() {
    101                     @Override
    102                     public void onAnimationStart(Animation animation) {
    103                     }
    104 
    105                     @Override
    106                     public void onAnimationRepeat(Animation animation) {
    107                     }
    108 
    109                     @Override
    110                     public void onAnimationEnd(Animation animation) {
    111                         view.setVisibility(View.INVISIBLE);
    112                     }
    113                 });
    114             }
    115             view.startAnimation(animation);
    116         } else {
    117             view.clearAnimation();
    118             view.setVisibility(shown ? View.VISIBLE : View.INVISIBLE);
    119         }
    120     }
    121 }
    122