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      1 /*
      2  * Copyright (C) 2007 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.widget.gridview;
     18 
     19 import com.android.frameworks.coretests.R;
     20 
     21 import android.app.Activity;
     22 import android.content.Context;
     23 import android.os.Bundle;
     24 import android.os.Handler;
     25 import android.view.View;
     26 import android.view.ViewGroup;
     27 import android.view.LayoutInflater;
     28 import android.widget.AdapterView;
     29 import android.widget.BaseAdapter;
     30 import android.widget.GridView;
     31 import android.widget.TextView;
     32 
     33 import java.util.Random;
     34 
     35 /**
     36  * Exercises change notification in a list
     37  */
     38 public class GridThrasher extends Activity implements AdapterView.OnItemSelectedListener
     39 {
     40     Handler mHandler = new Handler();
     41     ThrashListAdapter mAdapter;
     42     Random mRandomizer = new Random();
     43     TextView mText;
     44 
     45     Runnable mThrash = new Runnable() {
     46         public void run() {
     47             mAdapter.bumpVersion();
     48             mHandler.postDelayed(mThrash, 500);
     49         }
     50     };
     51 
     52     private class ThrashListAdapter extends BaseAdapter {
     53         private LayoutInflater mInflater;
     54 
     55         /**
     56          * Our data, part 1.
     57          */
     58         private String[] mTitles = new String[100];
     59 
     60         /**
     61          * Our data, part 2.
     62          */
     63         private int[] mVersion = new int[100];
     64 
     65         public ThrashListAdapter(Context context) {
     66             mInflater = (LayoutInflater)context.getSystemService(Context.LAYOUT_INFLATER_SERVICE);
     67             mTitles = new String[100];
     68             mVersion = new int[100];
     69 
     70             int i;
     71             for (i=0; i<100; i++) {
     72                 mTitles[i] = "[" + i + "]";
     73                 mVersion[i] = 0;
     74             }
     75         }
     76 
     77         public int getCount() {
     78             return mTitles.length;
     79         }
     80 
     81         public Object getItem(int position) {
     82             return position;
     83         }
     84 
     85         public long getItemId(int position) {
     86             return position;
     87         }
     88 
     89         public View getView(int position, View convertView, ViewGroup parent) {
     90             TextView view;
     91 
     92             if (convertView == null) {
     93                 view = (TextView) mInflater.inflate(android.R.layout.simple_list_item_1, null);
     94             } else {
     95                 view = (TextView) convertView;
     96             }
     97             view.setText(mTitles[position] + " " + mVersion[position]);
     98             return view;
     99         }
    100 
    101 
    102         public void bumpVersion() {
    103             int position = mRandomizer.nextInt(getCount());
    104             mVersion[position]++;
    105             notifyDataSetChanged();
    106         }
    107 
    108 
    109     }
    110 
    111     @Override
    112     public void onCreate(Bundle icicle)
    113     {
    114         super.onCreate(icicle);
    115 
    116         setContentView(R.layout.grid_thrasher);
    117 
    118         mText = findViewById(R.id.text);
    119         mAdapter = new ThrashListAdapter(this);
    120         GridView g = findViewById(R.id.grid);
    121         g.setAdapter(mAdapter);
    122 
    123         mHandler.postDelayed(mThrash, 5000);
    124 
    125         g.setOnItemSelectedListener(this);
    126     }
    127 
    128     public void onItemSelected(AdapterView parent, View v, int position, long id) {
    129         mText.setText("Position " + position);
    130     }
    131 
    132     public void onNothingSelected(AdapterView parent) {
    133         mText.setText("Nothing");
    134     }
    135 }
    136