Android学习笔记之GridView

<1>简介

一个在平面上可显示多个条目的可滚动的视图组件，该组件中的条目通过一个ListAdapter和该组件进行关联。

比如实现九宫格图，用GridView是首选，也是最简单的。

<2>XML属性

属性：

android:columnWidth

设置列的宽度。关联的方法为：setColumnWidth(int)

android:gravity

设置此组件中的内容在组件中的位置。

必须是一个或多个(用“|”分隔开)以下的常量。

top、bottom、left、right、center_vertical、fill_vertical、center_horizontal、fill_horizontal、center、fill

关联方法：setGravity (int gravity)

android:horizontalSpacing

两列之间的间距。关联方法：setHorizontalSpacing(int)

android:numColumns

列数。关联方法：setNumColumns(int)

可以是auto_fit常量，表示尽可能多的显示列来填补的可用空间。

android:stretchMode

缩放模式。关联方法：setStretchMode(int)

Constant	Value	Description
`none`	0	无
`spacingWidth`	1	在每列之间的空间进行缩放
`columnWidth`	2	每列进行平均的缩放
`spacingWidthUniform`	3	每一列之间的间隔是均匀地缩放.

android:verticalSpacing

两行之间的间距。关联方法：setVerticalSpacing(int)

<3>常用公共方法

public ListAdapter getAdapter()

获得与此组件相关的适配器

返回值： ListAdapter适配器实例

public int getNumColumns()

获得GridView的列数

public int getStretchMode()

获得GridView的缩放模式

public void setAdapter(ListAdapter adapter)

设置与此组件相关的适配器

public void setColumnWidth(int columnWidth)

设置GridView的列宽.

public void setGravity(int gravity)

设置控件内容的位置，默认值为：Gravity.LEFT

public void setHorizontalSpacing(int horizontalSpacing)

设置列间距.

public void setNumColumns(int numColumns)

设置grid的列数

public void setSelection(int position)

设置选中的条目.

public void setStretchMode(int stretchMode)

设置grid中的条目以什么缩放模式去填充空间。

stretchMode 可选值：NO_STRETCH，STRETCH_SPACING，STRETCH_SPACING_UNIFORM，或STRETCH_COLUMN_WIDTH

<4>范例

main.xml

<?xml version="1.0" encoding="utf-8"?><GridView xmlns:android="http://schemas.android.com/apk/res/android"    android:id="@+id/gridview"    android:layout_width="fill_parent"    android:layout_height="fill_parent"    android:verticalSpacing="5dip"    android:horizontalSpacing="5dip"    android:columnWidth="80dip"    android:numColumns="auto_fit"    android:stretchMode="columnWidth"    android:gravity="center"    />

package xiaosi.gridview;import android.app.Activity;import android.content.Context;import android.os.Bundle;import android.view.View;import android.view.ViewGroup;import android.widget.AdapterView;import android.widget.AdapterView.OnItemClickListener;import android.widget.BaseAdapter;import android.widget.GridView;import android.widget.ImageView;import android.widget.Toast;public class GridViewActivity extends Activity {    /** Called when the activity is first created. */private GridView gridview = null;    @Override    public void onCreate(Bundle savedInstanceState) {        super.onCreate(savedInstanceState);        setContentView(R.layout.main);                gridview = (GridView)findViewById(R.id.gridview);        gridview.setAdapter(new ImageAdapter(GridViewActivity.this));            gridview.setOnItemClickListener(new OnItemClickListener() {public void onItemClick(AdapterView<?> arg0, View arg1, int arg2,long arg3) {Toast.makeText(GridViewActivity.this, "" + arg2, Toast.LENGTH_SHORT).show();        }                });    }        public class ImageAdapter extends BaseAdapter {    private Context context;    private int[] ImageBox ={    R.drawable.sample_1,R.drawable.sample_0,    R.drawable.sample_3,R.drawable.sample_4,    R.drawable.sample_5,R.drawable.sample_2,    R.drawable.sample_3,R.drawable.sample_2,    R.drawable.sample_4,R.drawable.sample_5,    R.drawable.sample_4,R.drawable.sample_2,    R.drawable.sample_3,R.drawable.sample_3,    R.drawable.sample_4,R.drawable.sample_5,    R.drawable.sample_5,R.drawable.sample_7};    public ImageAdapter(Context context){    this.context = context;    }    public int getCount() {    return ImageBox.length;    }    public Object getItem(int arg0) {    // TODO Auto-generated method stub    return null;    }    public long getItemId(int position) {    // TODO Auto-generated method stub    return 0;    }    public View getView(int position, View convertView, ViewGroup parent) {    ImageView imageView;            if (convertView == null) {      // if it's not recycled, initialize some attributes                imageView = new ImageView(context);                imageView.setLayoutParams(new GridView.LayoutParams(120, 120));                imageView.setScaleType(ImageView.ScaleType.CENTER_CROP);                imageView.setPadding(8, 8, 8, 8);            }    else     {               imageView = (ImageView) convertView;           }         imageView.setImageResource(ImageBox[position]);            return imageView;    }        }}

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