Android开发拖拉图片Gallery画廊组…

新建grid_layout.xml

<?xml version="1.0" encoding="utf-8"?>

<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"

    android:layout_width="wrap_content"

    android:layout_height="match_parent"

    android:orientation="vertical" >

    

    <ImageView 

        android:id="@+id/img"

        android:layout_width="wrap_content"

        android:layout_height="wrap_content"

        android:scaleType="center"/>

</LinearLayout>

main.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=".MainActivity" 

    android:gravity="bottom">

    <ImageSwitcher 

        android:id="@+id/imageswitcher"

        android:layout_width="fill_parent"

        android:layout_height="wrap_content"/>

    

    <Gallery 

        android:id="@+id/myGallery"

        android:layout_gravity="center_vertical"

        android:layout_width="fill_parent"

        android:layout_height="wrap_content"

        android:spacing="3px"/>

    

</LinearLayout>

main.java

package com.example.gallerydemo;

import java.lang.reflect.Field;

import java.util.ArrayList;

import java.util.HashMap;

import java.util.List;

import java.util.Map;

import android.os.Bundle;

import android.app.Activity;

import android.util.Log;

import android.view.Menu;

import android.view.View;

import android.widget.AdapterView;

import android.widget.AdapterView.OnItemClickListener;

import android.widget.ImageView;

import android.widget.LinearLayout.LayoutParams;

import android.widget.ViewSwitcher.ViewFactory;

import android.widget.Gallery;

import android.widget.ImageSwitcher;

import android.widget.SimpleAdapter;

import android.widget.TextView;

public class MainActivity extends Activity {

private Gallery myGallery=null;

private SimpleAdapter simpleAdapter=null;

private ImageSwitcher imageswitcher=null;

private List<Map<String,Integer>> list=new ArrayList<Map<String,Integer>>();

protected void onCreate(Bundle savedInstanceState) {

super.onCreate(savedInstanceState);

setContentView(R.layout.activity_main);

this.myGallery=(Gallery) super.findViewById(R.id.myGallery);

this.initAdapter();

this.myGallery.setAdapter(this.simpleAdapter);

this.myGallery.setOnItemClickListener(new OnItemClickListenerImp());

this.imageswitcher=(ImageSwitcher) super.findViewById(R.id.imageswitcher);

this.imageswitcher.setFactory(new ViewFactoryImp());

}

private void initAdapter(){

//取得全部的属性

Field[] fields=R.drawable.class.getDeclaredFields();

for(int i=0;i<fields.length;i++){

//System.out.println(fields[i]);

if(fields[i].getName().startsWith("ispic_")){

Map<String,Integer> map=new HashMap<String, Integer>();

try {

//必须指定名称是img

map.put("img", fields[i].getInt(R.drawable.class));

} catch (Exception e) {

// TODO: handle exception

}

this.list.add(map);

}

}

//如果使用SimpleAdapter需要自己定义内部的布局文件

this.simpleAdapter=new SimpleAdapter(this,this.list , 

R.layout.grid_layout, 

new String[]{"img"}, 

new int[]{R.id.img});

}

private class OnItemClickListenerImp implements OnItemClickListener{

public void onItemClick(AdapterView<?> parent, View view, int position,

long id) {

Map<String,Integer> map=(Map<String, Integer>) parent.getAdapter().getItem(position);

MainActivity.this.imageswitcher.setImageResource(map.get("img"));

}

}

private class ViewFactoryImp implements ViewFactory{

public View makeView() {

ImageView img=new ImageView(MainActivity.this);

img.setBackgroundColor(0xFFFFFFFF);

img.setScaleType(ImageView.ScaleType.CENTER);

img.setLayoutParams(new ImageSwitcher.LayoutParams(LayoutParams.FILL_PARENT,LayoutParams.FILL_PARENT));

return img;

}

}

}