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  • gridView 添加

    引用:http://www.cnblogs.com/salam/archive/2010/10/06/1844596.html

    GridView是Android中的数据显示控件,先体验一下它的效果

    这是GridView只呈现图片的效果。源码下载

    下面详细介绍一下GridView。

    一、简介

        在二维可滚动网格中呈现子项(Item),Item来自于与之相关的ListAdapter.

    二、重要方法

      getStretchMode():获取GridView的延伸模式。

      onKeyDown(int keyCode, KeyEvent event):默认KeyEvent.Callback.onKeyMultiple()

    三、具体应用

    1.在布局文件中说明

    <GridView xmlns:android="http://schemas.android.com/apk/res/android" android:id="@+id/grid"
     android:layout_width="match_parent" 
     android:layout_height="match_parent"
        android:padding="10dp"
        android:verticalSpacing="10dp"
        
        android:horizontalSpacing="10dp"
        android:numColumns="auto_fit"
        android:columnWidth="60dp"
        android:stretchMode="columnWidth"
        
        android:gravity="center"
        />

     

    2.程序使用

    private GridView mGrid;

    mGrid = (GridView) findViewById(R.id.grid);

     

    3.定义适配器

    public class AppsAdapter extends BaseAdapter {
      public AppsAdapter() {
      }

      public View getView(int position, View convertView, ViewGroup parent) {
       ImageView i;

       if (convertView == null) {
        i = new ImageView(GridDemo.this);
        i.setScaleType(ImageView.ScaleType.FIT_CENTER);
        i.setLayoutParams(new GridView.LayoutParams(50, 50));
       } else {
        i = (ImageView) convertView;
       }

       ResolveInfo info = mApps.get(position);
       i.setImageDrawable(info.activityInfo.loadIcon(getPackageManager()));

       return i;
      }

      public final int getCount() {
       return mApps.size();
      }

      public final Object getItem(int position) {
       return mApps.get(position);
      }

      public final long getItemId(int position) {
       return position;
      }
     }

     

    4.应用适配器

    mGrid.setAdapter(new AppsAdapter());

     

    5.获取图片

     private void loadApps() {
      Intent mainIntent = new Intent(Intent.ACTION_MAIN, null);
      mainIntent.addCategory(Intent.CATEGORY_LAUNCHER);

      mApps = getPackageManager().queryIntentActivities(mainIntent, 0);
     }

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  • 原文地址:https://www.cnblogs.com/sode/p/2177631.html
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