ImageSwitcher gallery 实现图片展示

来源：互联网发布：c语言中switch什么意思编辑：程序博客网时间：2024/05/01 18:59

1、新建imageswitcher.xml

<?xml version="1.0" encoding="utf-8"?><RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"    android:layout_width="fill_parent"    android:layout_height="fill_parent"    android:orientation="vertical" >    <ImageSwitcher        android:id="@+id/imageswitcher"        android:layout_width="match_parent"        android:layout_height="wrap_content"        android:layout_alignParentTop="true" />    <Gallery        android:id="@+id/gallery"        android:layout_width="fill_parent"        android:layout_height="wrap_content"        android:layout_alignParentBottom="true"        android:layout_marginTop="10px"        android:gravity="center_vertical"        android:spacing="10px" />    <!--         android:layout_alignParentBottom="true"                   就是让 Gallery 位于屏幕底端， LinearLayout 不存在这个属性    --></RelativeLayout>

2、导入图片img1-img5到drawable-mdpi中

3、新建一个ImageAdapter.java 继承BaseAdapter

package com.xiaoku.demo.adapter;import android.content.Context;import android.graphics.Color;import android.view.View;import android.view.ViewGroup;import android.widget.BaseAdapter;import android.widget.Gallery;import android.widget.Gallery.LayoutParams;import android.widget.ImageView;import com.xiaoku.demo.R;public class ImageAdapter extends BaseAdapter {private Context ctx;private int images[] ={R.drawable.img1,R.drawable.img2,R.drawable.img3,R.drawable.img4,R.drawable.img5};public ImageAdapter(Context ctx){this.ctx = ctx;    }@Overridepublic int getCount() {return images.length;}@Overridepublic Object getItem(int position) {return images[position];}@Overridepublic long getItemId(int position) {return images[position];}@Overridepublic View getView(int position, View convertView, ViewGroup parent) {ImageView iv;iv = (ImageView) convertView;if(iv==null){iv = new ImageView(ctx);}iv.setImageResource(images[position]);iv.setScaleType(ImageView.ScaleType.CENTER_INSIDE);LayoutParams layoutParams = new LayoutParams(60, 60);iv.setLayoutParams(layoutParams);iv.setBackgroundColor(Color.LTGRAY);return iv;}}

4、创建ImageSwitcherActivity，继承Activity，实现OnItemSelectedListener, ViewFactory

package com.xiaoku.demo;import android.app.Activity;import android.os.Bundle;import android.util.DisplayMetrics;import android.view.View;import android.view.ViewGroup.LayoutParams;import android.view.Window;import android.view.WindowManager;import android.widget.AdapterView;import android.widget.AdapterView.OnItemSelectedListener;import android.widget.Gallery;import android.widget.ImageSwitcher;import android.widget.ImageView;import android.widget.ViewSwitcher.ViewFactory;import com.xiaoku.demo.adapter.ImageAdapter;public class ImageSwitcherActivity extends Activity implementsOnItemSelectedListener, ViewFactory {private Gallery gallery;private ImageSwitcher imageswitcher;private ImageAdapter adapter;private DisplayMetrics dm;@Overrideprotected void onCreate(Bundle savedInstanceState) {super.onCreate(savedInstanceState);requestWindowFeature(Window.FEATURE_NO_TITLE);// 隐藏标题int flag = WindowManager.LayoutParams.FLAG_FULLSCREEN;// 全屏this.getWindow().setFlags(flag, flag);setContentView(R.layout.imageswitcher);// 得到屏幕尺寸dm = new DisplayMetrics();getWindowManager().getDefaultDisplay().getMetrics(dm);gallery = (Gallery) this.findViewById(R.id.gallery);imageswitcher = (ImageSwitcher) this.findViewById(R.id.imageswitcher);// 下面这句必须要，不然会使 setImageSource 这个方法指向空指针imageswitcher.setFactory(this);adapter = new ImageAdapter(this);gallery.setAdapter(adapter);gallery.setOnItemSelectedListener(this);}@Overridepublic View makeView() {ImageView iv = new ImageView(this);// 设置背景颜色iv.setBackgroundColor(0xFF646464);iv.setScaleType(ImageView.ScaleType.FIT_CENTER);iv.setLayoutParams(new ImageSwitcher.LayoutParams(LayoutParams.FILL_PARENT, dm.heightPixels - 70));/* 上面语句中 -70 的目的是应为， ImageSwitcher 下面要显示 Gallery ，我们在 ImageAdapter 中设定了 view.setLayoutParams(new Gallery.LayoutParams(60, 60)); 即高度是 60pixels ，在加在 main.xml 中 Gallery 有下面这样的属性： android:layout_marginTop="10px" 因此加起来一共刚好是 70px*/return iv;}// 点击gallery图片事件@Overridepublic void onItemSelected(AdapterView<?> parent, View view, int position,long id) {int imageID = (int) adapter.getItemId(position);imageswitcher.setImageResource(imageID);}@Overridepublic void onNothingSelected(AdapterView<?> parent) {imageswitcher.setImageResource((int) adapter.getItemId(0));// 显示第一张}}

上面用到的gallery，现在已经废弃了，推荐使用新的HorizontalScrollView

参考文章：http://blog.csdn.net/pathuang68/article/details/6541823

http://blog.csdn.net/dazlly/article/details/7863923

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