android脚步---图片浏览

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
        android:id="@+id/root"
        android:orientation="vertical"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
       >
    
</LinearLayout>

package org.crazyit.helloworld;

import android.os.Bundle;
import android.app.Activity;
import android.view.DragEvent;
import android.view.Menu;
import android.view.View;
import android.view.View.OnDragListener;
import android.widget.Button;
import android.widget.ImageView;
import android.widget.LinearLayout;
import android.widget.TextView;

public class MainActivity extends Activity {
    //定义一个访问图片的数组
    int[] images = new int[]{
            R.drawable.ic_launcher,
            R.drawable.aaa,
            R.drawable.asd,
            R.drawable.sss
            
    };
    int currentImg = 0;
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        //获取线性布局容器
        LinearLayout main = (LinearLayout)findViewById(R.id.root);
        //程序创建iamgeview组件
        final ImageView image = new ImageView(this);
        //添加进布局
        main.addView(image);
        //初始化显示第一张照片
        image.setImageResource(images[0]);
        image.setOnClickListener(new View.OnClickListener(){
            public void onClick(View v)
            {
                if (currentImg >=4)
                {
                    currentImg = -1;
                }
                image.setImageResource(images[++currentImg]);
            }

            
        });
    }


}