GridViewProject 網格的顯示操作

GridView 的內容可以使用SimpleAdapter設置，也可以通過自定義的BaseAdapter子類完成設置 （ImageAdapter）

下面是用SimpleAdapter實現的網格 適配器可用來填充各種組件

主程序  MyDemo.java

package com.jackie.gridviewproject;


import java.lang.reflect.Field;
import java.util.ArrayList;
import java.util.HashMap;
import java.util.List;
import java.util.Map;


import android.app.Activity;
import android.app.AlertDialog;
import android.app.Dialog;
import android.content.DialogInterface;
import android.os.Bundle;
import android.view.Menu;
import android.view.View;
import android.view.ViewGroup.LayoutParams;
import android.widget.AdapterView;
import android.widget.AdapterView.OnItemClickListener;
import android.widget.GridView;
import android.widget.ImageView;
import android.widget.LinearLayout;
import android.widget.SimpleAdapter;


public class MyDemo extends Activity {
private GridView myGridView = null;
private SimpleAdapter simpleAdapter = null;
private List<Map<String, Integer>> list = new ArrayList<Map<String, Integer>>();


@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
super.setContentView(R.layout.main);
this.initAdapter();
this.myGridView = (GridView) super.findViewById(R.id.myGridView);
this.myGridView.setAdapter(simpleAdapter);
this.myGridView.setOnItemClickListener(new OnItemClickListenerImpl());
}

private class OnItemClickListenerImpl implements OnItemClickListener {
@SuppressWarnings("unchecked")
@Override
public void onItemClick(AdapterView<?> parent, View view, int position,
long id) {
ImageView imageView = new ImageView(MyDemo.this);
imageView.setScaleType(ImageView.ScaleType.CENTER);
imageView.setLayoutParams(new LinearLayout.LayoutParams(
LayoutParams.MATCH_PARENT, LayoutParams.MATCH_PARENT));
Map<String,Integer> map=(Map<String,Integer>) parent.getAdapter().getItem(position);
   imageView.setImageResource(map.get("img"));
Dialog dialog=new AlertDialog.Builder(MyDemo.this)
.setIcon(R.drawable.file)
.setTitle("查看圖片")
.setView(imageView).setNegativeButton("關閉", new DialogInterface.OnClickListener() {

@Override
public void onClick(DialogInterface arg0, int arg1) {
}
}).create();
dialog.show();
}
}
private void initAdapter() {
Field[] fields = R.drawable.class.getDeclaredFields();  // 利用反射機制取得圖片資源
for (int x = 0; x < fields.length; x++) {
if (fields[x].getName().startsWith("pic_")) {
Map<String, Integer> map = new HashMap<String, Integer>();
try {
map.put("img", fields[x].getInt(R.drawable.class));
} catch (Exception e) {
}
this.list.add(map);
}
}
this.simpleAdapter = new SimpleAdapter(this, this.list,
R.layout.grid_layout, new String[] { "img" },
new int[] { R.id.img });
}

@Override
public boolean onCreateOptionsMenu(Menu menu) {
// Inflate the menu; this adds items to the action bar if it is present.
getMenuInflater().inflate(R.menu.my_demo, menu);
return true;
}
}

兩個佈局文件

主佈局文件 main.xml 和網格佈局文件grid_layout.xml

<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:orientation="vertical"
    tools:context=".MyDemo" >
    <GridView
        android:id="@+id/myGridView"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:numColumns="4"
        android:stretchMode="columnWidth"/>

</LinearLayout>

<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:orientation="vertical"
    tools:context=".MyDemo" >

    <ImageView
        android:id="@+id/img"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:scaleType="center"
        android:padding="3dp"/>
</LinearLayout>