Home | History | Annotate | Download | only in widget 
      1 /*
      2  * Copyright (C) 2013 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.example.android.supportv4.widget;
     18 
     19 import android.app.Activity;
     20 import android.os.Bundle;
     21 import android.view.View;
     22 import android.view.View.OnClickListener;
     23 import android.view.ViewTreeObserver;
     24 import android.widget.Button;
     25 import android.widget.TextView;
     26 
     27 import androidx.core.widget.ContentLoadingProgressBar;
     28 
     29 import com.example.android.supportv4.R;
     30 
     31 /**
     32  * Demonstrates how to use the ContentLoadingProgressBar. By default, the
     33  * developer should start the ContentLoadingProgressBar with visibility of
     34  * "gone" or "invisible". The ContentLoadingProgressBar will be shown after the
     35  * default delay for at least a minimum time regardless of when the "hide"
     36  * button is pressed.
     37  */
     38 public class ContentLoadingProgressBarActivity extends Activity implements
     39         OnClickListener, ViewTreeObserver.OnGlobalLayoutListener {
     40 
     41     private Button mShowButton;
     42     private Button mHideButton;
     43     private ContentLoadingProgressBar mBar;
     44     private long mShowTime;
     45     private long mHideTime;
     46     private TextView mShowText;
     47     private TextView mShowTextDone;
     48     private TextView mHideText;
     49     private TextView mHideTextDone;
     50     private int mLastVisibility;
     51     private long mVisibilityChangedTime;
     52 
     53     @Override
     54     protected void onCreate(Bundle savedInstanceState) {
     55         super.onCreate(savedInstanceState);
     56         setContentView(R.layout.content_loading_progressbar);
     57 
     58         mBar = (ContentLoadingProgressBar)findViewById(R.id.progressbar);
     59         mShowButton = (Button)findViewById(R.id.show);
     60         mShowButton.setOnClickListener(this);
     61         mHideButton = (Button)findViewById(R.id.hide);
     62         mHideButton.setOnClickListener(this);
     63 
     64         mShowText = (TextView)findViewById(R.id.show_text);
     65         mShowTextDone = (TextView)findViewById(R.id.show_text_done);
     66         mHideText = (TextView)findViewById(R.id.hide_text);
     67         mHideTextDone = (TextView)findViewById(R.id.hide_text_done);
     68 
     69         mLastVisibility = mBar.getVisibility();
     70 
     71         mBar.getViewTreeObserver().addOnGlobalLayoutListener(this);
     72     }
     73 
     74     @Override
     75     public void onClick(View v) {
     76         switch (v.getId()) {
     77             case R.id.show:
     78                 mBar.show();
     79                 mShowTime = System.currentTimeMillis();
     80                 mShowText.setText("Show clicked at " + mShowTime);
     81                 break;
     82             case R.id.hide:
     83                 mBar.hide();
     84                 mHideTime = System.currentTimeMillis();
     85                 mHideText.setText("Hide clicked at " + mHideTime);
     86                 break;
     87         }
     88     }
     89 
     90     @Override
     91     public void onGlobalLayout() {
     92         final int visibility = mBar.getVisibility();
     93 
     94         if (mLastVisibility != visibility) {
     95             if (visibility == View.VISIBLE) {
     96                 mVisibilityChangedTime = System.currentTimeMillis();
     97                 mShowTextDone.setText("Shown at "
     98                     + (mVisibilityChangedTime - mShowTime));
     99             } else {
    100                 mHideTextDone.setText("Hidden after "
    101                     + (System.currentTimeMillis() - mVisibilityChangedTime));
    102             }
    103             mLastVisibility = mBar.getVisibility();
    104         }
    105     }
    106 }
    107