Android通过ViewPager实现左右滑动切换图片

想开发像人人网相册打开单张图片时候能左右滑动切换图片的效果，开始通过FlipperView实现，不能跟手拖动，效果不好，而且需要自己写很多代码来控制FlipperView中的View。后来发现Android 3.0之后的SDK中提供了android-support-v4包用以实现版本兼容，让老版本系统下的应用通过加入jar包实现扩展，得到新版的各种技术优势，例如Fragment等。

 

ViewPager是android-support-v4.jar包中的一个系统控件，继承自ViewGroup，专门用以实现左右滑动切换View的效果，使用时需要首先在Project->properties->Java Build Path->Libraries->Add External Jars中加入sdk目录下的extras/android/support/v4/android-support-v4.jar（如果找不到，则需要用sdk manager下载android support package）。加入这个jar包之后就可以使用ViewPager类了。

 

ViewPager的使用类似于ListView，需要有对应的Adapter进行数据绑定，实现图片切换仅需要继承PaperAdapter就可以了。继承后需要重写如下四个方法。

 

 

• instantiateItem(ViewGroup, int)
• destroyItem(ViewGroup, int, Object)
• getCount()
• isViewFromObject(View, Object)

类似于BaseAdapter，其中instantiateItem方法用来得到每个View，destroyItem用以控制当某个View不需要的时候的回收处理。isViewFromObject用来实现判断View和Object是否为同一个View。

import java.io.FileNotFoundException;
import java.util.List;

import android.content.Context;
import android.graphics.Bitmap;
import android.net.Uri;
import android.support.v4.view.PagerAdapter;
import android.support.v4.view.ViewPager;
import android.view.View;
import android.view.ViewGroup;
import android.widget.ImageView;

public class TestAdapter extends PagerAdapter {

	private List<String> mPaths;
	
	private Context mContext;
	
	public TestAdapter(Context cx) {
		mContext = cx.getApplicationContext();
	}
	
	public void change(List<String> paths) {
		mPaths = paths;
	}
	
	@Override
	public int getCount() {
		// TODO Auto-generated method stub
		return mPaths.size();
	}

	@Override
	public boolean isViewFromObject(View view, Object obj) {
		// TODO Auto-generated method stub
		return view == (View) obj;
	}

	@Override
	public Object instantiateItem (ViewGroup container, int position) {
		ImageView iv = new ImageView(mContext);
		try {
			Bitmap bm = BitmapFactory.decodeFile(mPaths.get(position));//载入bitmap
			iv.setImageBitmap(bm);
		} catch (FileNotFoundException e) {
			// TODO Auto-generated catch block
			e.printStackTrace();
		} catch (OutOfMemoryError e) {
			// TODO Auto-generated catch block
			e.printStackTrace();
		}
		((ViewPager)container).addView(iv, 0);
		return iv;
	}
	
	@Override
	public void destroyItem (ViewGroup container, int position, Object object) {
		container.removeView((View)object);
	}
}

 

    <android.support.v4.view.ViewPager
        android:id="@+id/pager"
        android:layout_width="fill_parent"
        android:layout_height="fill_parent" />

 

Activity:

    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.main);
        mViewPager = (ViewPager)findViewById(R.id.pager);
        mAdapter = new TestAdapter(this);
        mViewPager.setAdapter(mAdapter);
        mAdapter.change(getList());
    }
    
    private List<String> getList() {
    	List<String> list = new ArrayList<String>();
    	list.add("file:///sdcard/Sunset.jpg");
    	list.add("file:///sdcard/Winter.jpg");
    	list.add("file:///sdcard/Water lilies.jpg");
    	list.add("file:///sdcard/Blue hills.jpg");
    	return list;
    }

 

评论

7 楼 弘毅天空 2014-10-28  

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6 楼 chenzheng8975 2014-04-17  

楼主代码没贴完啊。。。。

5 楼 jdpxiaoming 2012-02-16  

谢谢喽住 又帮我扫盲了 会场的好     

4 楼 iamzhaozheng 2012-02-03  

dagf113225 写道

请把ImageFile.getBitmapSample贴出来
，谢谢！

已经修改

3 楼 dagf113225 2012-02-01  

请把ImageFile.getBitmapSample贴出来
，谢谢！

2 楼 iamzhaozheng 2012-01-30  

这个是自己写的一个类，没有贴出来，就是封装了将一个文件读取成Bitmap的方法，实现比较简单。

ikrboy 写道

ImageFile.getBitmapSample怎么来的？晕

1 楼 ikrboy 2012-01-29  

ImageFile.getBitmapSample怎么来的？晕