Android编程仿Iphone拖动相片特效Gallery的简单应用示例

摘要：本文实例讲述了Android编程仿Iphone拖动相片特效Gallery的简单应用。分享给大家供大家参考，具体如下：Step1:准备图片素材...

本文实例讲述了Android编程仿Iphone拖动相片特效Gallery的简单应用。分享给大家供大家参考，具体如下：

Step 1:准备图片素材.

将icon2,icon3,icon4,icon5,icon6五张图片导入res/drawable里加上icon.png本身一共有6张图片.

Step 2:新建Android工程,命名为GalleryDemo.

Step 3:设计UI,修改main.xml代码如下:

<"1.0" encoding="utf-8"?> <LinearLayout xmlns:android="http://schemas.android.com/apk/res/android" android:background="@drawable/white" android:orientation="vertical" android:layout_width="fill_parent" android:layout_height="fill_parent" > <TextView android:id="@+id/myTextView01" android:layout_width="fill_parent" android:layout_height="wrap_content" android:text="@string/hello" android:gravity="center_vertical|center_horizontal" /> <Gallery android:id="@+id/myGallery1" android:layout_width="fill_parent" android:layout_height="wrap_content" android:gravity="bottom" /> </LinearLayout>

Step 4:设计主程序类GalleryDemo.Java代码如下:

package com.android.test; import com.android.test.R.drawable; import android.app.Activity; import android.content.Context; import android.os.Bundle; import android.view.View; import android.view.ViewGroup; import android.widget.BaseAdapter; import android.widget.Gallery; import android.widget.ImageView; public class GalleryDemo extends Activity { /** Called when the activity is first created. */ @Override public void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.main); ((Gallery) findViewById(R.id.myGallery1)).setAdapter(new ImageAdapter( this)); } public class ImageAdapter extends BaseAdapter { /* 类成员 myContext为Context父类 */ private Context myContext; /* 使用res/drawable图片作为图片来源 */ private int[] myImageIds = { drawable.icon, drawable.icon2, drawable.icon3, drawable.icon4, drawable.icon5, drawable.icon6}; /* 构造器只有一个参数，即要存储的Context */ public ImageAdapter(Context c) { this.myContext = c; } /* 返回所有已定义的图片总数量 */ public int getCount() { return this.myImageIds.length; } /* 利用getItem方法，取得目前容器中图像的数组ID */ public Object getItem(int position) { return position; } public long getItemId(int position) { return position; } /* 取得目前欲显示的图像View，传入数组ID值使之读取与成像 */ public View getView(int position, View convertView, ViewGroup parent) { /* 创建一个ImageView对象 */ ImageView i = new ImageView(this.myContext); i.setImageResource(this.myImageIds[position]); i.setScaleType(ImageView.ScaleType.FIT_XY); /* 设置这个ImageView对象的宽高，单位为dip */ i.setLayoutParams(new Gallery.LayoutParams(120, 120)); return i; } /* 依据距离中央的位移量利用getScale返回views的大小(0.0f to 1.0f) */ public float getScale(boolean focused, int offset) { /* Formula: 1 / (2 ^ offset) */ return Math.max(0, 1.0f / (float) Math.pow(2, Math.abs(offset))); } } }

Step 5:run it,效果如下图:

Android编程仿Iphone拖动相片特效Gallery的简单应用示例1