Clove的Android备课笔记之第一课 多图片浏览  

<?xml version="1.0" encoding="utf-8"?>
<resources>
    <string name="app_name">30c.org PicViewer</string>
    <string name="prov">上一张</string>
    <string name="next">下一张</string>
    <string name="addAlpha">增加透明度</string>
    <string name="subAlpha">减少透明度</string>
</resources>

<?xml version="1.0" encoding="utf-8"?>
<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="center_horizontal">
<ImageView android:id="@+id/showPic" android:layout_width="wrap_content"
android:layout_height="wrap_content" android:src="@drawable/p1" ></ImageView>
<LinearLayout android:orientation="horizontal" android:layout_width="wrap_content"
android:layout_height="wrap_content" android:gravity="center_horizontal">
<Button android:id="@+id/butProv" android:text="@string/prov"
android:layout_width="wrap_content" android:layout_height="wrap_content"></Button>
<Button android:id="@+id/butAddAlpha" android:text="@string/addAlpha"
android:layout_width="wrap_content" android:layout_height="wrap_content"></Button>
<Button android:id="@+id/butSubAlpha" android:text="@string/subAlpha"
android:layout_width="wrap_content" android:layout_height="wrap_content"></Button>
<Button android:id="@+id/butNext" android:text="@string/next"
android:layout_width="wrap_content" android:layout_height="wrap_content"></Button> 
</LinearLayout>
</LinearLayout>

package clove.test;

import android.app.Activity;
import android.os.Bundle;
import android.util.Log;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.Button;
import android.widget.ImageView;
import android.widget.Toast;

public class ChangPic extends Activity {
private Button butProv;
private Button butAddAlpha;
private Button butSubAlpha;
private Button butNext;
private ImageView showPic;
private OnClickListener listener;
private int[] allPic;//所有待显示图片
private int alpha = 255;//默认图片可见度最大
private int picOrder = 0;//当前显示的图片次序 
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.main);
        //初始化图片
        allPic = new int[]{
         R.drawable.p1,R.drawable.p2,R.drawable.p3,R.drawable.p4,
         R.drawable.p5,R.drawable.p6,R.drawable.p7,R.drawable.p8         
        };
        //得到对象
        butProv = (Button) findViewById(R.id.butProv);
        butAddAlpha = (Button) findViewById(R.id.butAddAlpha);
        butSubAlpha = (Button) findViewById(R.id.butSubAlpha);
        butNext = (Button) findViewById(R.id.butNext);
        showPic = (ImageView) findViewById(R.id.showPic);        
        //创建匿名内部监听对象
        listener = new View.OnClickListener() { 
public void onClick(View v) {
if(v==butProv)//上一张,其实可以到头循环,为了测试信息框就判断吧
{
if(picOrder>0) 
showPic.setImageResource(allPic[--picOrder]);
else 
Toast.makeText(ChangPic.this, "前面已经木有图片啦", 5000).show(); 
}
else if(v==butNext)//下一张,到头自动循环
{
if(picOrder==allPic.length-1)
Toast.makeText(ChangPic.this, "眼一闭一睁,一圈结束了", 5000).show();
picOrder =  ++picOrder%allPic.length;
showPic.setImageResource(
allPic[picOrder]);
}
else if(v==butAddAlpha)
{
alpha+=alpha>=255?0:25;
showPic.setAlpha(alpha);
}
else if(v==butSubAlpha)
{
alpha-=alpha<=0?0:25;
showPic.setAlpha(alpha);
}
}
};
//添加监听器注册
butProv.setOnClickListener(listener);
butNext.setOnClickListener(listener); 
butAddAlpha.setOnClickListener(listener);
butSubAlpha.setOnClickListener(listener);
    }
}

打完收工,木哈哈哈

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