（学习记）GridView的使用！

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　　　当我们需要在屏幕上显示多外元素的时候，我们可以选择GridView，

由于有多个元素，我们就要使用BaseAdapter来存储这些元素。使用起来也很简单。

程序的运行结果如下：

xml的代码如下：

<?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:numColumns="auto_fit"    android:verticalSpacing="10dp"    android:horizontalSpacing="10dp"    android:columnWidth="90dp"    android:stretchMode="columnWidth"    android:gravity="center"/>

package com.liu;import android.app.Activity;import android.os.Bundle;import android.widget.AdapterView;import android.widget.GridView;import android.widget.Toast;import android.view.View;import android.widget.AdapterView.OnItemClickListener;public class Gridview extends Activity {    /** Called when the activity is first created. */@Overridepublic void onCreate(Bundle savedInstanceState){super.onCreate(savedInstanceState);setContentView(R.layout.main);//取得GridView对象GridView gridview = (GridView) findViewById(R.id.gridview);//添加元素给gridviewgridview.setAdapter(new ImageAdapter(this));// 设置Gallery的背景gridview.setBackgroundResource(R.drawable.bg0);//事件监听gridview.setOnItemClickListener(new OnItemClickListener() {public void onItemClick(AdapterView<?> parent, View v, int position, long id){Toast.makeText(Gridview.this, "你选择了" + (position + 1) + " 号图片", Toast.LENGTH_SHORT).show();}});}}

ImageAdapter.java代码如下：

package com.liu;import android.content.Context;import android.view.View;import android.view.ViewGroup;import android.widget.BaseAdapter;import android.widget.GridView;import android.widget.ImageView;public class ImageAdapter extends BaseAdapter{// 定义Contextprivate ContextmContext;// 定义整型数组 即图片源private Integer[]mImageIds= { R.drawable.img1, R.drawable.img2, R.drawable.img3, R.drawable.img4, R.drawable.img5, R.drawable.img6, R.drawable.img7,R.drawable.img8, R.drawable.img9, };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IDpublic 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;}}