• Android开发- 图片转换器控件(ImageSwitcher )的使用
  • 发布于 2个月前
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 ImageSwitcher 的 Demo
imageswitcher.xml

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:orientation
="vertical" android:layout_width="fill_parent"
    android:layout_height
="fill_parent">

    
<Gallery android:id="@+id/gallery" android:layout_width="fill_parent"
        android:layout_height
="wrap_content" android:spacing="20px" />

    
<!--
        ImageSwitcher - 图片转换器控件(改变图片时增加一些动画效果)
    
-->
    
<ImageSwitcher android:id="@+id/imageSwitcher"
        android:layout_width
="fill_parent" android:layout_height="wrap_content" />

</LinearLayout>


_ImageSwitcher.java

package com.webabcd.view;

import android.app.Activity;
import android.content.Context;
import android.os.Bundle;
import android.view.View;
import android.view.ViewGroup;
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.ViewSwitcher;
import android.widget.Gallery.LayoutParams;

// 图片转换器的使用基本同文字转换器
// 以下是一个用 ImageSwitcher + Gallery 实现的经典的图片浏览器的 Demo
public class _ImageSwitcher extends Activity implements
        ViewSwitcher.ViewFactory {

    
private ImageSwitcher mSwitcher;

    @Override
    
protected void onCreate(Bundle savedInstanceState) {
        
// TODO Auto-generated method stub
        super.onCreate(savedInstanceState);
        
this.setContentView(R.layout.imageswithcer);

        setTitle(
"ImageSwithcer");

        mSwitcher 
= (ImageSwitcher) findViewById(R.id.imageSwitcher);
        mSwitcher.setFactory(
this);
        mSwitcher.setInAnimation(AnimationUtils.loadAnimation(
this,
                android.R.anim.fade_in));
        mSwitcher.setOutAnimation(AnimationUtils.loadAnimation(
this,
                android.R.anim.fade_out));

        Gallery gallery 
= (Gallery) findViewById(R.id.gallery);
        gallery.setAdapter(
new ImageAdapter(this));
        gallery.setOnItemSelectedListener(
new AdapterView.OnItemSelectedListener() {
            @Override
            
public void onItemSelected(AdapterView<?> parent, View v,
                    
int position, long id) {
                mSwitcher.setImageResource(mImageIds[position]);
            }

            @Override
            
public void onNothingSelected(AdapterView<?> arg0) {

            }
        });
    }

    
public class ImageAdapter extends BaseAdapter {

        
private Context mContext;

        
public ImageAdapter(Context context) {
            mContext 
= context;
        }

        
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 image 
= new ImageView(mContext);

            image.setImageResource(mThumbIds[position]);
            image.setAdjustViewBounds(
true);
            image.setLayoutParams(
new Gallery.LayoutParams(
                    LayoutParams.WRAP_CONTENT, LayoutParams.WRAP_CONTENT));

            
return image;
        }
    }

    
private Integer[] mThumbIds = { R.drawable.icon01, R.drawable.icon02,
            R.drawable.icon03, R.drawable.icon04, R.drawable.icon05 };

    
private Integer[] mImageIds = { R.drawable.icon01, R.drawable.icon02,
            R.drawable.icon03, R.drawable.icon04, R.drawable.icon05 };

    @Override
    
public View makeView() {
        ImageView image 
= new ImageView(this);
        image.setMinimumHeight(
200);
        image.setMinimumWidth(
200);
        image.setScaleType(ImageView.ScaleType.FIT_CENTER);
        image.setLayoutParams(
new ImageSwitcher.LayoutParams(
                LayoutParams.FILL_PARENT, LayoutParams.FILL_PARENT));
        
return image;
    }
}

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