android反射获取资源

package org.wangliang.gridview;import java.lang.reflect.Field;import java.util.ArrayList;import java.util.HashMap;import android.app.Activity;import android.os.Bundle;import android.widget.GridView;import android.widget.SimpleAdapter;import android.widget.Toast;public class Main extends Activity {    /** Called when the activity is first created. */    @Override    public void onCreate(Bundle savedInstanceState) {        super.onCreate(savedInstanceState);        setContentView(R.layout.gridview);        setupAdapter();    }private void setupAdapter() {// TODO Auto-generated method stubGridView gridView = (GridView) findViewById(R.id.emotions);ArrayList<HashMap<String,Object>> data = new ArrayList<HashMap<String,Object>>();Field[] fileds = R.drawable.class.getDeclaredFields();for(Field f:fileds) {if(!f.getName().equals("icon")) {int id;try {id = f.getInt(null);} catch (Exception e) {// TODO Auto-generated catch blocke.printStackTrace();Toast.makeText(this, "wrong!", 1).show();return ;} HashMap<String,Object> map = new HashMap<String,Object>();map.put("image", id);//这里使用的是资源的iddata.add(map);}}SimpleAdapter adapter = new SimpleAdapter(this, data, R.layout.gridview_item, new String[] {"image"}, new int[] {R.id.emotion_item});gridView.setAdapter(adapter);}}

//下面是布局文件gridview..xml

<?xml version="1.0" encoding="utf-8"?><LinearLayoutxmlns:android="http://schemas.android.com/apk/res/android"android:orientation="vertical"android:layout_width="fill_parent"android:layout_height="fill_parent"><GridViewandroid:id="@+id/emotions"android:layout_width="fill_parent"android:layout_height="fill_parent"android:scrollbars="vertical"android:numColumns="auto_fit"android:verticalSpacing="10dp"android:stretchMode="columnWidth"android:gravity="center"android:columnWidth="40dp"></GridView></LinearLayout>

//下面是布局文件gridview_item.xml

<?xml version="1.0" encoding="utf-8"?><LinearLayoutxmlns:android="http://schemas.android.com/apk/res/android"android:layout_width="fill_parent"android:layout_height="fill_parent"><ImageViewandroid:id="@+id/emotion_item"android:layout_width="wrap_content"android:layout_height="wrap_content" android:layout_weight="50"android:layout_gravity="center"></ImageView></LinearLayout>

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