Gridview 使用
本例子主要用 ：
1 SimpleAdapter 作为适配器加载List<Map>数据
2 BaseAdapter 加载List<Map>数据 两种形式作为适配器加载数据
package com.example.fragmentdemo1;
import java.util.ArrayList;
import java.util.HashMap;
import android.app.Activity;
import android.content.Context;
import android.os.Bundle;
import android.util.Log;
import android.view.LayoutInflater;
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.SimpleAdapter;
import android.widget.TextView;
import android.widget.Toast;
/**
* Gridview 使用
* 本例子主要用 ：
* 1 SimpleAdapter 作为适配器加载List<Map>数据
* 2 BaseAdapter 加载List<Map>数据 两种形式作为适配器加载数据
*/
public class GradViewActivity extends Activity {
private Integer[] resIds = { R.drawable.bd, R.drawable.qq,
R.drawable.safari, R.drawable.shezhi, R.drawable.tongxunlu,
R.drawable.wangyi, R.drawable.weixin, R.drawable.xj, R.drawable.yx,
R.drawable.zp };
private String[] name = { "百度", "QQ", "safari", "设置", "通讯录", "网易", "微信",
"相机", "游戏", "照片" };
private ArrayList<HashMap<String, Object>> item;// 数据
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.griditeminfo);
//显示简单的图片列表
// showSimpleGrad();
showBaseAdapterGrad();
}
/**
* 显示grid列表 ，用SimpleAdapter 作为适配器
*/
private void showSimpleGrad() {
getData() ;//准备数据
GridView gridview = (GridView) findViewById( R.id.gridview);
// SimpleAdapter对象，匹配ArrayList中的元素
SimpleAdapter simpleAdapter = new SimpleAdapter(this,
item, //数据来源
R.layout.gridview, //每一个格子中的布局加载
new String[] { "itemImage", "itemName" }, //每一个方格中列的名字，它会与Map中的key相对应
new int[] { R.id.itemImage, R.id.itemName }) {//对应着上面参数给的值
};
//添加并且显示
gridview.setAdapter(simpleAdapter);
//添加消息处理
gridview.setOnItemClickListener(new OnItemClickListener(){
@Override
public void onItemClick(AdapterView<?> parent, View view,
int position, long id) {
//parent.getItemAtPosition( )
Log.v("gradView", (String)item.get(position ).get("itemName")) ;
Toast.makeText(getApplicationContext(),(String) item.get(position ).get("itemName"),Toast.LENGTH_SHORT).show();
}
});
}
// 准备数据
public void getData() {
item = new ArrayList<HashMap<String, Object>>();
for (int i = 0; i < resIds.length; i++) {
HashMap<String, Object> map = new HashMap<String, Object>();
map.put("itemImage", resIds[i]);
map.put("itemName", name[i]);
item.add(map);
}
}
//使用BaseAdapter
private void showBaseAdapterGrad() {
getData() ;//准备数据
GridView gridview = (GridView) findViewById( R.id.gridview);
ImageAdapter adapter = new ImageAdapter(this);
//添加并且显示
gridview.setAdapter(adapter);
//添加消息处理
gridview.setOnItemClickListener(new OnItemClickListener(){
@Override
public void onItemClick(AdapterView<?> parent, View view,
int position, long id) {
//parent.getItemAtPosition( ) 取出 相应的数据
Log.v("gradView", (String)item.get(position ).get("itemName")) ;
Toast.makeText(getApplicationContext(),(String) item.get(position ).get("itemName"),Toast.LENGTH_SHORT).show();
}
});
}
//用BaseAdapter 用作adapter
private class ImageAdapter extends BaseAdapter{
private LayoutInflater mInflater;// 得到一个LayoutInfalter对象用来导入布局
//private Context mContext;
public ImageAdapter(Context context) {
//this.mContext=context;
this.mInflater = LayoutInflater.from(context);
}
@Override
public int getCount() {
return resIds.length;
}
@Override
public Object getItem(int position) {
return resIds[position];
}
@Override
public long getItemId(int position) {
// TODO Auto-generated method stub
return 0;
}
/**
* 每一个小的 方格中的控件的加载
*/
@Override
public View getView(int position, View convertView, ViewGroup parent) {
//定义一个ImageView,显示在GridView里
convertView = mInflater.inflate(R.layout.gridview, null);
ImageView imageView = (ImageView) convertView.findViewById( R.id.itemImage);
TextView textView = (TextView) convertView.findViewById( R.id.itemName);
Log.v("GridView", "加载GridView：getView 1=="+position );
imageView.setImageResource((Integer)item.get(position ).get("itemImage"));
textView.setText( (String)item.get(position ).get("itemName"));
Log.v("GridView", "加载GridView：getView 2");
// 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 convertView;
}
}
}
2 gridView的布局
<?xml version = "1.0" encoding = "utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:orientation="vertical"
android:paddingTop="20dp">
<GridView
android:id="@+id/gridview"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:columnWidth="90dp"
android:numColumns="auto_fit"
android:stretchMode="columnWidth"
android:horizontalSpacing="10dp">
</GridView>
</LinearLayout>
3 每个方格中加载的数据的控件布局
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="match_parent"
android:layout_height="wrap_content" >
<ImageView
android:id="@+id/itemImage"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_centerHorizontal="true" >
</ImageView>
<TextView
android:id="@+id/itemName"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_below="@+id/itemImage"
android:layout_centerHorizontal="true" >
</TextView>
</RelativeLayout>
4 附件中是使用到的图片