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：

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

使用GridView布局，显示图标

icon_dialog_activity.xml

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout 
    xmlns:android="http://schemas.android.com/apk/res/android"
    android:id="@+id/launch_linear"
    android:layout_width="fill_parent" 
    android:layout_height="fill_parent"
    android:background="@color/half_transparent"
    android:orientation="vertical"
    >
       <GridView
            android:id="@+id/gridview"
            android:layout_width="fill_parent" 
            android:layout_height="fill_parent"
            android:numColumns="auto_fit"
            android:verticalSpacing="5dip"
            android:horizontalSpacing="5dip"
            android:columnWidth="60dip"
            android:stretchMode="columnWidth"
            android:gravity="center"
        />
</LinearLayout>

Java文件中，如下使用

public class IconDialog extends Activity  {
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.icon_dialog_activity);
        //取得GridView对象
        GridView gridview = (GridView) findViewById(R.id.gridview);        
        //添加元素给gridview
        gridview.setAdapter(new ImageAdapter(this));
        // 设置Gallery的背景
        gridview.setBackgroundResource(R.drawable.paper_01);
        //事件监听
        gridview.setOnItemClickListener(new OnItemClickListener() {
            public void onItemClick(AdapterView<?> parent, View v, int position, long id)
            {
                Toast.makeText(IconDialog.this, " the " + (position + 1) , Toast.LENGTH_SHORT).show();
                
                Intent resultValue = new Intent(IconDialog.this,MiniNoteConfige.class);
                resultValue.putExtra("icon",position);
                setResult(RESULT_OK, resultValue);
                finish();
            } 
        });
    }
    
    public class ImageAdapter extends BaseAdapter{
        // 定义Context
        private Context        mContext;
        // 定义整型数组 即图片源
        private Integer[]    mImageIds    = {
                R.drawable.clip1,
                R.drawable.clip2, 
                R.drawable.clip3, 
                R.drawable.clip4,
                R.drawable.clip5,
                R.drawable.clip6, 
                R.drawable.clip7,
                R.drawable.clip8, 
                R.drawable.clip9, 
                R.drawable.clip10,
                R.drawable.clip11,
                R.drawable.clip12, 
                R.drawable.clip13, 
                R.drawable.clip14, 
                R.drawable.clip15, 
                R.drawable.clip16, 
                R.drawable.clip17,
                R.drawable.clip18, 
                R.drawable.clip19, 
                R.drawable.clip20,
                R.drawable.clip21,
                R.drawable.clip22, 
                R.drawable.clip23, 
                R.drawable.clip24, 
                R.drawable.clip25, 
                R.drawable.clip26, 
                R.drawable.clip27,
                R.drawable.clip28
        };
        
        public ImageAdapter(Context c){
            mContext = c;
        }

        // 获取图片的个数
        public int getCount(){
            return mImageIds.length;
        }

        // 获取图片在库中的位置
        public Object getItem(int position){
            return position;
        }


        // 获取图片ID
        public long getItemId(int position){
            return position;
        }

        public View getView(int position, View convertView, ViewGroup parent)
        {
            ImageView imageView;
            if (convertView == null){
                // 给ImageView设置资源
                imageView = new ImageView(mContext);
                // 设置布局 图片120×120显示
                imageView.setLayoutParams(new GridView.LayoutParams(85, 85));
                // 设置显示比例类型
                imageView.setScaleType(ImageView.ScaleType.FIT_CENTER);
            }else
            {
                imageView = (ImageView) convertView;
            }

            imageView.setImageResource(mImageIds[position]);
            return imageView;
        }
    }
}

跳转界面，显示图标界面

Intent intent = new Intent(MiniNoteConfige.this, IconDialog.class);  
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