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      1 /*
      2  * Copyright (C) 2012 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 android.ui.cts;
     18 
     19 import android.app.ListActivity;
     20 import android.os.Bundle;
     21 import android.widget.AbsListView;
     22 import android.widget.AbsListView.OnScrollListener;
     23 import android.widget.ArrayAdapter;
     24 import android.widget.ListView;
     25 
     26 import java.util.concurrent.CountDownLatch;
     27 import java.util.concurrent.TimeUnit;
     28 
     29 /**
     30  * Activity for measuring scrolling time of long list.
     31  */
     32 public class ScrollingActivity extends ListActivity implements OnScrollListener {
     33     static final String TAG = "ScrollingActivity";
     34     private static final String NUM_ELEMENTS_EXTRA = "num_elements";
     35     private static final int NUM_ELEMENTS_DEFAULT = 10000;
     36     private static final int SCROLL_TIME_IN_MS = 1;
     37     private static final int WAIT_TIMEOUT_IN_SECS = 5 * 60;
     38     private String[] mItems;
     39     private CountDownLatch mLatchStop = null;
     40     private int mTargetLoc;
     41     private int mNumElements;
     42 
     43     public void onCreate(Bundle icicle) {
     44         super.onCreate(icicle);
     45         mNumElements = getIntent().getIntExtra(NUM_ELEMENTS_EXTRA, NUM_ELEMENTS_DEFAULT);
     46         mItems = new String[mNumElements];
     47         for (int i = 0; i < mNumElements; i++) {
     48             mItems[i] = Integer.toString(i);
     49         }
     50         setListAdapter(new ArrayAdapter<String>(this,
     51                 android.R.layout.simple_list_item_1, mItems));
     52         ListView view = getListView();
     53         view.setOnScrollListener(this);
     54     }
     55 
     56     public boolean scrollToTop() {
     57         return doScroll(0);
     58     }
     59     public boolean scrollToBottom() {
     60         return doScroll(mNumElements - 1);
     61     }
     62 
     63     private boolean doScroll(final int loc) {
     64         mLatchStop = new CountDownLatch(1);
     65         mTargetLoc = loc;
     66         final ListView view = getListView();
     67         runOnUiThread( new Runnable() {
     68             @Override
     69             public void run() {
     70                 view.smoothScrollToPositionFromTop(loc, 0, SCROLL_TIME_IN_MS);
     71             }
     72         });
     73         boolean result = false;
     74         try {
     75             result = mLatchStop.await(WAIT_TIMEOUT_IN_SECS, TimeUnit.SECONDS);
     76         } catch (InterruptedException e) {
     77             // ignore
     78         }
     79         mLatchStop = null;
     80         return result;
     81     }
     82 
     83     @Override
     84     public void onScrollStateChanged(AbsListView view, int scrollState) {
     85 
     86     }
     87 
     88     @Override
     89     public void onScroll(AbsListView view, int firstVisibleItem,
     90             int visibleItemCount, int totalItemCount) {
     91         //Log.i(TAG, "onScroll " + firstVisibleItem + " " + visibleItemCount);
     92         if ((mTargetLoc >= firstVisibleItem) &&
     93                 (mTargetLoc <= (firstVisibleItem + visibleItemCount))) {
     94             if (mLatchStop != null) {
     95                 mLatchStop.countDown();
     96             }
     97         }
     98     }
     99 }
    100