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      1 /*
      2  * Copyright (C) 2008 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.listview;
     18 
     19 import com.android.frameworks.coretests.R;
     20 
     21 import android.app.ListActivity;
     22 import android.content.Context;
     23 import android.os.Bundle;
     24 import android.view.Menu;
     25 import android.view.MenuItem;
     26 import android.view.View;
     27 import android.widget.ArrayAdapter;
     28 
     29 
     30 /**
     31  * Tests using an empty view with a list */
     32 public class ListWithEmptyView extends ListActivity {
     33 
     34     private class CarefulAdapter<T> extends ArrayAdapter<T> {
     35 
     36         public CarefulAdapter(Context context, int textViewResourceId) {
     37             super(context, textViewResourceId);
     38             // TODO Auto-generated constructor stub
     39         }
     40 
     41         @Override
     42         public long getItemId(int position) {
     43             if (position <  0 || position >= this.getCount()) {
     44                 throw new ArrayIndexOutOfBoundsException();
     45             }
     46             return super.getItemId(position);
     47         }
     48 
     49 
     50     }
     51 
     52     public static final int MENU_ADD = Menu.FIRST + 1;
     53     public static final int MENU_REMOVE = Menu.FIRST + 2;
     54 
     55     private CarefulAdapter<String> mAdapter;
     56 
     57     private int mNextItem = 0;
     58 
     59     private View mEmptyView;
     60 
     61     @Override
     62     public void onCreate(Bundle savedInstanceState) {
     63         super.onCreate(savedInstanceState);
     64         mAdapter = new CarefulAdapter<String>(this,
     65                 android.R.layout.simple_list_item_1);
     66         setContentView(R.layout.list_with_empty_view);
     67         setListAdapter(mAdapter);
     68 
     69         mEmptyView = findViewById(R.id.empty);
     70         getListView().setEmptyView(mEmptyView);
     71     }
     72 
     73     @Override
     74     public boolean onCreateOptionsMenu(Menu menu) {
     75         super.onCreateOptionsMenu(menu);
     76         menu.add(0, MENU_ADD, 0, R.string.menu_add)
     77                 .setIcon(android.R.drawable.ic_menu_add);
     78         menu.add(0, MENU_REMOVE, 0, R.string.menu_remove)
     79                 .setIcon(android.R.drawable.ic_menu_delete);
     80         return true;
     81     }
     82 
     83     @Override
     84     public boolean onOptionsItemSelected(MenuItem item) {
     85         switch (item.getItemId()) {
     86             case MENU_ADD:
     87                 String str = "Item + " + mNextItem++;
     88                 mAdapter.add(str);
     89                 return true;
     90             case MENU_REMOVE:
     91                 if (mAdapter.getCount() > 0) {
     92                     mAdapter.remove(mAdapter.getItem(0));
     93                 }
     94                 return true;
     95         }
     96 
     97         return super.onOptionsItemSelected(item);
     98     }
     99 
    100     public View getEmptyView() {
    101         return mEmptyView;
    102     }
    103 
    104 }
    105