Android 控件之ImageSwitcher图片切换器

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

源码下载

一、重要方法

setImageURI(Uri uri)：设置图片地址

setImageResource(int resid)：设置图片资源库

setImageDrawable(Drawable drawable)：绘制图片

二、实例

　　 <ImageSwitcher android:id="@+id/switcher"
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        android:layout_alignParentTop="true"
        android:layout_alignParentLeft="true"
    />
   
    <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"
    />

is = (ImageSwitcher) findViewById(R.id.switcher);

is.setFactory(this);

设置动画效果

  is.setInAnimation(AnimationUtils.loadAnimation(this,
    android.R.anim.fade_in));
  is.setOutAnimation(AnimationUtils.loadAnimation(this,
    android.R.anim.fade_out));

三、完整代码

1.布局文件

<?xml version="1.0" encoding="utf-8"?>

<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_alignParentTop="true"
        android:layout_alignParentLeft="true"
    />
   
    <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>
   2.Java代码

package wjq.WidgetDemo;

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.BaseAdapter;
import android.widget.Gallery;
import android.widget.ImageSwitcher;
import android.widget.ImageView;
import android.widget.AdapterView.OnItemClickListener;
import android.widget.AdapterView.OnItemSelectedListener;
import android.widget.Gallery.LayoutParams;
import android.widget.ViewSwitcher.ViewFactory;

public class ImageSwitcherDemo extends Activity implements
  OnItemSelectedListener, ViewFactory {
 private ImageSwitcher is;
 private Gallery gallery;

 private Integer[] mThumbIds = { R.drawable.b, R.drawable.c,
   R.drawable.d, R.drawable.f, R.drawable.g,
   };

 private Integer[] mImageIds = { R.drawable.b, R.drawable.c,
   R.drawable.d, R.drawable.f, R.drawable.g, };

 /*
  * (non-Javadoc)
  *
  * @see android.app.Activity#onCreate(android.os.Bundle)
  */
 @Override
 protected void onCreate(Bundle savedInstanceState) {
  // TODO Auto-generated method stub
  super.onCreate(savedInstanceState);
  requestWindowFeature(Window.FEATURE_NO_TITLE);
  setContentView(R.layout.imageswitcherpage);

  is = (ImageSwitcher) findViewById(R.id.switcher);
  is.setFactory(this);

  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));
  gallery.setOnItemSelectedListener(this);
 }

 @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;
 }

 public class ImageAdapter extends BaseAdapter {
  public ImageAdapter(Context c) {
   mContext = c;
  }

  public int getCount() {
   return mThumbIds.length;
  }

  public Object getItem(int position) {
   return position;
  }

  public long getItemId(int position) {
   return position;
  }

  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;
  }

  private Context mContext;

 }

 @Override
 public void onItemSelected(AdapterView<?> parent, View view, int position,
   long id) {
  is.setImageResource(mImageIds[position]);

 }

 @Override
 public void onNothingSelected(AdapterView<?> parent) {
  // TODO Auto-generated method stub

 }

}