android之gridview图片列表

本文介绍下android的个grid view的用法,

gridview是一项显示二维的viewgroup，可滚动的网格。网格项时自动插入的布局使用listadapter。
1.创建一个新的项目:gridview.

2,打开 res/layout/main.xml文件,插入一下代码:

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:orientation="vertical"
    android:layout_width="fill_parent"
    android:layout_height="fill_parent"
    >
<GridView
         android:id="@+id/gridview"
         android:layout_width="fill_parent"
         android:layout_height="fill_parent"
         android:columnWidth="90dp"
         android:numColumns="auto_fit"
         android:verticalSpacing="10dp"
         android:horizontalSpacing="10dp"
         android:stretchMode="columnWidth"
         android:gravity="center"
         />
 
</LinearLayout>

做好以后就可以在屏幕上显示一个grid view

3.打开gridview.java首先要导入包:

package cn.gridview;

import android.widget.GridView;
import android.widget.Toast;
import android.app.Activity;
import android.os.Bundle;
import android.widget.AdapterView.OnItemClickListener;
import android.widget.AdapterView;
import android.view.View;

在onCreate添加方法:

 public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.main);
        GridView gridview=(GridView)findViewById(R.id.gridview);//找到main.xml中定义gridview 的id
        gridview.setAdapter(new ImageAdapter(this));//调用ImageAdapter.java
        gridview.setOnItemClickListener(new OnItemClickListener(){//监听事件
         public void onItemClick(AdapterView<?> parent, View view, int position, long id)
         {
          Toast.makeText(gridview.this, ""+position,Toast.LENGTH_SHORT).show();//显示信息;
         }
        });
    }

ImageAdapter.java


package cn.gridview;

import android.view.View;
import android.view.ViewGroup;
import android.widget.BaseAdapter;
import android.content.Context;
import android.widget.ImageView;
import android.widget.GridView;

public class ImageAdapter extends BaseAdapter {
 private Context mContext;
 
 public ImageAdapter(Context c)
 {
  mContext=c;
 }
 @Override
 public int getCount() {
  // TODO Auto-generated method stub
  return mThumbIds.length;
 }

 @Override
 public Object getItem(int position) {
  // TODO Auto-generated method stub
  return null;
 }

 @Override
 public long getItemId(int position) {
  // TODO Auto-generated method stub
  return 0;
 }

 @Override
 public View getView(int position, View convertView, ViewGroup parent) {
  // TODO Auto-generated method stub
  
  ImageView imageview;
  if(convertView==null)
  {
   imageview=new ImageView(mContext);
   imageview.setLayoutParams(new GridView.LayoutParams(85, 85));
   imageview.setScaleType(ImageView.ScaleType.CENTER_CROP);
   imageview.setPadding(8,8,8,8);
 }
  else
  {
   imageview=(ImageView) convertView;
  }
  imageview.setImageResource(mThumbIds[position]);
  return imageview;
  }

 private Integer[] mThumbIds={//显示的图片数组
  
  R.drawable.sample_2,R.drawable.sample_3,
  R.drawable.sample_4,R.drawable.sample_5,
  R.drawable.sample_6,R.drawable.sample_7,
  R.drawable.sample_0,R.drawable.sample_1,
  R.drawable.sample_2,R.drawable.sample_3,
  R.drawable.sample_4,R.drawable.sample_5,
  R.drawable.sample_6,R.drawable.sample_7,
  R.drawable.sample_0,R.drawable.sample_1,
  R.drawable.sample_2,R.drawable.sample_3,
  R.drawable.sample_4,R.drawable.sample_5,
  R.drawable.sample_6,R.drawable.sample_7,
 };
 

}

运行后界面如图: