图片切换ImageSwitcher&Gallery

来源:转载

ImageSwitcher是Android中控制图片展示效果的一个控件,如:幻灯片效果...,颇有感觉啊。做相册一绝。

一、设计界面

1、打开“res/layout/activity_main.xml”文件。

打开activity_main.xml文件。

代码如下:

<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android" android:layout_width="match_parent" android:layout_height="match_parent" > <ImageSwitcher android:id="@+id/switcher" android:layout_width="match_parent" android:layout_height="match_parent" android:layout_alignParentLeft="true" android:layout_alignParentTop="true" > </ImageSwitcher> <Gallery android:id="@+id/gallery" android:background="#55000000" android:layout_width="match_parent" android:layout_height="60dp" android:layout_alignParentBottom="true" android:layout_alignParentLeft="true" android:gravity="center_vertical" android:spacing="16dp" /></RelativeLayout>

二、程序文件

打开“src/com.genwoxue.imageswitcher/MainActivity.java”文件。

然后输入以下代码:

import android.app.ActionBar.LayoutParams;import android.app.Activity;import android.content.Context;import android.os.Bundle;import android.view.View;import android.view.ViewGroup;import android.view.Window;import android.view.animation.AnimationUtils;import android.widget.AdapterView;import android.widget.AdapterView.OnItemSelectedListener;import android.widget.BaseAdapter;import android.widget.Gallery;import android.widget.ImageSwitcher;import android.widget.ImageView;import android.widget.ViewSwitcher.ViewFactory;public class MainActivity extends Activity implements OnItemSelectedListener,ViewFactory{ //声明ImageSwitcher、Gallery private ImageSwitcher is = null; private Gallery gallery = null; //定义缩微图,图片已经复制到drawable-hdpi文件夹了 private Integer[] mThumbIds = { R.drawable.a, R.drawable.b, R.drawable.c, R.drawable.d, R.drawable.e }; //定义图 private Integer[] mImageIds = { R.drawable.a, R.drawable.b, R.drawable.c, R.drawable.d, R.drawable.e }; @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); requestWindowFeature(Window.FEATURE_NO_TITLE); setContentView(R.layout.activity_main); is = (ImageSwitcher) findViewById(R.id.switcher); is.setFactory(this); //显示效果 is.setInAnimation(AnimationUtils.loadAnimation(this, android.R.anim.fade_in)); is.setOutAnimation(AnimationUtils.loadAnimation(this, android.R.anim.fade_out)); gallery = (Gallery) findViewById(R.id.gallery); gallery.setAdapter(new ImageAdapter(this));//类中要写构造参数 //设置OnItemSelected监听事件 gallery.setOnItemSelectedListener(this); } public class ImageAdapter extends BaseAdapter{ private Context mContext; public ImageAdapter(Context c) { // TODO 自动生成的构造函数存根 mContext = c; } @Override public int getCount() { // TODO 自动生成的方法存根 return mThumbIds.length; } @Override public Object getItem(int position) { return position; } @Override public long getItemId(int position) { return position; } @Override public View getView(int position, View convertView, ViewGroup parent) { ImageView i = new ImageView(mContext); i.setImageResource(mThumbIds[position]); i.setAdjustViewBounds(true); i.setLayoutParams(new Gallery.LayoutParams(LayoutParams.WRAP_CONTENT,LayoutParams.WRAP_CONTENT)); i.setBackgroundResource(R.drawable.e); return i; } } @Override public void onItemSelected(AdapterView<?> parent, View view, int position, long id) { is.setImageResource(mImageIds[position]); } @Override public void onNothingSelected(AdapterView<?> arg0) { // TODO 自动生成的方法存根 } @Override public View makeView() { ImageView i = new ImageView(this); i.setBackgroundColor(0xFF000000); i.setScaleType(ImageView.ScaleType.FIT_CENTER); i.setLayoutParams(new ImageSwitcher.LayoutParams(LayoutParams.MATCH_PARENT,LayoutParams.MATCH_PARENT)); return i; }}

三、运行效果




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