Android：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

</pre><pre name="code" class="java">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) {
 		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) {
  
 	}

}