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      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.widget.Button;
     21 import android.widget.LinearLayout;
     22 import android.widget.ProgressBar;
     23 import android.widget.TextView;
     24 import android.os.Bundle;
     25 import android.os.Handler;
     26 import android.support.v4.widget.ContentLoadingProgressBar;
     27 import android.view.View;
     28 import android.view.View.OnClickListener;
     29 import android.view.ViewTreeObserver;
     30 import android.view.Window;
     31 
     32 import com.example.android.supportv4.R;
     33 
     34 /**
     35  * Demonstrates how to use the ContentLoadingProgressBar. By default, the
     36  * developer should start the ContentLoadingProgressBar with visibility of
     37  * "gone" or "invisible". The ContentLoadingProgressBar will be shown after the
     38  * default delay for at least a minimum time regardless of when the "hide"
     39  * button is pressed.
     40  */
     41 public class ContentLoadingProgressBarActivity extends Activity implements
     42         OnClickListener, ViewTreeObserver.OnGlobalLayoutListener {
     43 
     44     private Button mShowButton;
     45     private Button mHideButton;
     46     private ContentLoadingProgressBar mBar;
     47     private long mShowTime;
     48     private long mHideTime;
     49     private TextView mShowText;
     50     private TextView mShowTextDone;
     51     private TextView mHideText;
     52     private TextView mHideTextDone;
     53     private int mLastVisibility;
     54     private long mVisibilityChangedTime;
     55 
     56     @Override
     57     protected void onCreate(Bundle savedInstanceState) {
     58         super.onCreate(savedInstanceState);
     59         setContentView(R.layout.content_loading_progressbar);
     60 
     61         mBar = (ContentLoadingProgressBar)findViewById(R.id.progressbar);
     62         mShowButton = (Button)findViewById(R.id.show);
     63         mShowButton.setOnClickListener(this);
     64         mHideButton = (Button)findViewById(R.id.hide);
     65         mHideButton.setOnClickListener(this);
     66 
     67         mShowText = (TextView)findViewById(R.id.show_text);
     68         mShowTextDone = (TextView)findViewById(R.id.show_text_done);
     69         mHideText = (TextView)findViewById(R.id.hide_text);
     70         mHideTextDone = (TextView)findViewById(R.id.hide_text_done);
     71 
     72         mLastVisibility = mBar.getVisibility();
     73 
     74         mBar.getViewTreeObserver().addOnGlobalLayoutListener(this);
     75     }
     76 
     77     @Override
     78     public void onClick(View v) {
     79         switch (v.getId()) {
     80             case R.id.show:
     81                 mBar.show();
     82                 mShowTime = System.currentTimeMillis();
     83                 mShowText.setText("Show clicked at " + mShowTime);
     84                 break;
     85             case R.id.hide:
     86                 mBar.hide();
     87                 mHideTime = System.currentTimeMillis();
     88                 mHideText.setText("Hide clicked at " + mHideTime);
     89                 break;
     90         }
     91     }
     92 
     93     @Override
     94     public void onGlobalLayout() {
     95         final int visibility = mBar.getVisibility();
     96 
     97         if (mLastVisibility != visibility) {
     98             if (visibility == View.VISIBLE) {
     99                 mVisibilityChangedTime = System.currentTimeMillis();
    100                 mShowTextDone.setText("Shown at "
    101                     + (mVisibilityChangedTime - mShowTime));
    102             } else {
    103                 mHideTextDone.setText("Hidden after "
    104                     + (System.currentTimeMillis() - mVisibilityChangedTime));
    105             }
    106             mLastVisibility = mBar.getVisibility();
    107         }
    108     }
    109 }
    110