android手机中图片的拖拉及浏览功能

配置文件

activity_main.xml

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

android:orientation="vertical"

android:layout_width="fill_parent"

android:layout_height="fill_parent"

android:gravity="bottom">

<ImageSwitcher

android:id="@+id/imageSwitcher"

android:layout_width="fill_parent"

android:layout_height="wrap_content"/>

<Gallery

android:id="@+id/gallery"

android:gravity="center_horizontal"

android:spacing="3px"

android:layout_width="fill_parent"

android:layout_height="wrap_content"/>

</LinearLayout>

img_data.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="wrap_content"

android:orientation="horizontal" >

<ImageView

android:id="@+id/img"

android:layout_width="wrap_content"

android:layout_height="wrap_content"

android:scaleType="center"/>

</LinearLayout>

程序文件

MainActivity.java

package com.example.simpleadaptergalleryproject;

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.view.Menu;

import android.view.View;

import android.view.ViewGroup.LayoutParams;

import android.widget.AdapterView;

import android.widget.AdapterView.OnItemClickListener;

import android.widget.Gallery;

import android.widget.ImageSwitcher;

import android.widget.ImageView;

import android.widget.SimpleAdapter;

import android.widget.Toast;

import android.widget.ViewSwitcher.ViewFactory;

public class MainActivity extends Activity {

private Gallery gallery=null;

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

private SimpleAdapter simpleAdapter=null;

private ImageSwitcher imageSwitcher=null;

@Override

protected void onCreate(Bundle savedInstanceState) {

super.onCreate(savedInstanceState);

super.setContentView(R.layout.activity_main);

this.gallery=(Gallery)super.findViewById(R.id.gallery);//取得资源ID

this.imageSwitcher=(ImageSwitcher)super.findViewById(R.id.imageSwitcher);//取得资源ID

this.imageSwitcher.setFactory(new ViewFactorylmpl());//设置转换工厂

this.initAdapter();//初始化适配器

this.gallery.setAdapter(this.simpleAdapter); //设置图片集

this.gallery.setOnItemClickListener(new OnItemClickListenerlmpl());//设置事件

}

private class ViewFactorylmpl implements ViewFactory{

@Override

public View makeView() {

ImageView image=new ImageView(MainActivity.this);

image.setBackgroundColor(0xFFFFFFFF);

image.setScaleType(ImageView.ScaleType.CENTER);

image.setLayoutParams(new ImageSwitcher.LayoutParams(LayoutParams.FILL_PARENT,

LayoutParams.FILL_PARENT));

return image;

}

}

private class OnItemClickListenerlmpl implements OnItemClickListener{

@Override

public void onItemClick(AdapterView<?> arg0, View arg1, int arg2,

long arg3) {

//Toast.makeText(MainActivity.this,"一直都很帅，从未被超越",Toast.LENGTH_LONG).show();

Map<String,Integer> map=(Map<String,Integer>)MainActivity.this.simpleAdapter.getItem(arg2);

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

}

}

private void initAdapter(){//初始化适配器

Field[] field=R.drawable.class.getDeclaredFields();//取得全部属性

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

if(field[i].getName().startsWith("ispic_")){ //找到所有以ispic_命名的图片

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

try{

map.put("img", field[i].getInt(R.drawable.class)); //设置图片资源

}catch(Exception e){

}

this.list.add(map); //保存图片资源

}

}

this.simpleAdapter=new SimpleAdapter(MainActivity.this,

MainActivity.this.list,//要包装的数据集合

R.layout.img_data, //要使用的资源模板

new String[]{"img"},//要显示map中的Key

new int[]{R.id.img});//与模板中的组建向匹配

}

@Override

public boolean onCreateOptionsMenu(Menu menu) {

// Inflate the menu; this adds items to the action bar if it is present.

getMenuInflater().inflate(R.menu.main, menu);

return true;

}

}