好记性不如烂笔杆android学习笔记<十五> GridView简单用法

需要达到的效果是：点击菜单中选项，添加表情图标，图标放在一个dialog类型的activity中：

首先在manifest中注册这个activity：

1        <activity android:name=".IconDialog"
2                 android:configChanges="orientation"
3                 android:theme="@android:style/Theme.Dialog"
4             />

使用GridView布局，显示图标

icon_dialog_activity.xml

 1 <?xml version="1.0" encoding="utf-8"?>
 2 <LinearLayout 
 3     xmlns:android="http://schemas.android.com/apk/res/android"
 4     android:id="@+id/launch_linear"
 5     android:layout_width="fill_parent" 
 6     android:layout_height="fill_parent"
 7     android:background="@color/half_transparent"
 8     android:orientation="vertical"
 9     >
10        <GridView
11             android:id="@+id/gridview"
12             android:layout_width="fill_parent" 
13             android:layout_height="fill_parent"
14             android:numColumns="auto_fit"
15             android:verticalSpacing="5dip"
16             android:horizontalSpacing="5dip"
17             android:columnWidth="60dip"
18             android:stretchMode="columnWidth"
19             android:gravity="center"
20         />
21 </LinearLayout>

Java文件中，如下使用

  1 public class IconDialog extends Activity  {
  2     @Override
  3     protected void onCreate(Bundle savedInstanceState) {
  4         super.onCreate(savedInstanceState);
  5         setContentView(R.layout.icon_dialog_activity);
  6         //取得GridView对象
  7         GridView gridview = (GridView) findViewById(R.id.gridview);        
  8         //添加元素给gridview
  9         gridview.setAdapter(new ImageAdapter(this));
 10         // 设置Gallery的背景
 11         gridview.setBackgroundResource(R.drawable.paper_01);
 12         //事件监听
 13         gridview.setOnItemClickListener(new OnItemClickListener() {
 14             public void onItemClick(AdapterView<?> parent, View v, int position, long id)
 15             {
 16                 Toast.makeText(IconDialog.this, " the " + (position + 1) , Toast.LENGTH_SHORT).show();
 17                 
 18                 Intent resultValue = new Intent(IconDialog.this,MiniNoteConfige.class);
 19                 resultValue.putExtra("icon",position);
 20                 setResult(RESULT_OK, resultValue);
 21                 finish();
 22             } 
 23         });
 24     }
 25     
 26     public class ImageAdapter extends BaseAdapter{
 27         // 定义Context
 28         private Context        mContext;
 29         // 定义整型数组 即图片源
 30         private Integer[]    mImageIds    = {
 31                 R.drawable.clip1,
 32                 R.drawable.clip2, 
 33                 R.drawable.clip3, 
 34                 R.drawable.clip4,
 35                 R.drawable.clip5,
 36                 R.drawable.clip6, 
 37                 R.drawable.clip7,
 38                 R.drawable.clip8, 
 39                 R.drawable.clip9, 
 40                 R.drawable.clip10,
 41                 R.drawable.clip11,
 42                 R.drawable.clip12, 
 43                 R.drawable.clip13, 
 44                 R.drawable.clip14, 
 45                 R.drawable.clip15, 
 46                 R.drawable.clip16, 
 47                 R.drawable.clip17,
 48                 R.drawable.clip18, 
 49                 R.drawable.clip19, 
 50                 R.drawable.clip20,
 51                 R.drawable.clip21,
 52                 R.drawable.clip22, 
 53                 R.drawable.clip23, 
 54                 R.drawable.clip24, 
 55                 R.drawable.clip25, 
 56                 R.drawable.clip26, 
 57                 R.drawable.clip27,
 58                 R.drawable.clip28
 59         };
 60         
 61         public ImageAdapter(Context c){
 62             mContext = c;
 63         }
 64 
 65         // 获取图片的个数
 66         public int getCount(){
 67             return mImageIds.length;
 68         }
 69 
 70         // 获取图片在库中的位置
 71         public Object getItem(int position){
 72             return position;
 73         }
 74 
 75 
 76         // 获取图片ID
 77         public long getItemId(int position){
 78             return position;
 79         }
 80 
 81         public View getView(int position, View convertView, ViewGroup parent)
 82         {
 83             ImageView imageView;
 84             if (convertView == null){
 85                 // 给ImageView设置资源
 86                 imageView = new ImageView(mContext);
 87                 // 设置布局 图片120×120显示
 88                 imageView.setLayoutParams(new GridView.LayoutParams(85, 85));
 89                 // 设置显示比例类型
 90                 imageView.setScaleType(ImageView.ScaleType.FIT_CENTER);
 91             }else
 92             {
 93                 imageView = (ImageView) convertView;
 94             }
 95 
 96             imageView.setImageResource(mImageIds[position]);
 97             return imageView;
 98         }
 99     }
100 }

跳转界面，显示图标界面

1 Intent intent = new Intent(MiniNoteConfige.this, IconDialog.class);  
2 startActivityForResult(intent, RESULT_FOR_ICON);

至于图标返回接收问题，我还没有找到更好的方法，这里就不写了