學習android編程之路（7）- gallery+baseAdapter+ImageSwitcher數據從assets中獲取

一，com.bean包 下 PicBean.java

public class PicBean implements Serializable{
	private String fname;
	private String path;
	public PicBean() {
		super();
		// TODO Auto-generated constructor stub
	}
	public PicBean(String fname, String path) {
		super();
		this.fname = fname;
		this.path = path;
	}
	public String getFname() {
		return fname;
	}
	public void setFname(String fname) {
		this.fname = fname;
	}
	public String getPath() {
		return path;
	}
	public void setPath(String path) {
		this.path = path;
	}	
}

二，com.adapter包下 PicListAdapter.java

public class PicListAdapter extends BaseAdapter {
	private Context context;
	private List<PicBean> lspic;
	private LayoutInflater layoutInflater;
	
	public PicListAdapter(Context context, List<PicBean> lspic) {
		super();
		this.context = context;
		this.lspic = lspic;
		layoutInflater=LayoutInflater.from(context);
		
	}
	@Override
	public int getCount() {
		// TODO Auto-generated method stub
		return lspic.size();

	}

	@Override
	public Object getItem(int arg0) {
		// TODO Auto-generated method stub
		return lspic.get(arg0);
	}

	@Override
	public long getItemId(int arg0) {
		// TODO Auto-generated method stub
		return arg0;
	}
	private class ViewHolder{
		public ImageView iv;
	}
	@Override
	public View getView(int position, View convertView, ViewGroup root) {
		ViewHolder vh=null;
		if(convertView==null){
			vh=new ViewHolder();
			convertView=layoutInflater.inflate(R.layout.gallery_item_layout, null);
			
			vh.iv=(ImageView) convertView.findViewById(R.id.gallery_item_iv);
			
			convertView.setTag(vh);
		}else{
			vh=(ViewHolder) convertView.getTag();
		}
		
		PicBean pb=lspic.get(position);
		try {
			//獲取位圖對象，將其添加到ImageView上
			Bitmap bm=BitmapFactory.decodeStream(context.getAssets().open(pb.getPath()));
			vh.iv.setImageBitmap(bm);
		} catch (IOException e) {
			// TODO Auto-generated catch block
			e.printStackTrace();
		}
		
		return convertView;
	}
}

三，com.action 包下ImageSwitcherActivity.java

public class ImageSwitcherActivity extends Activity implements ViewFactory{
	private ImageSwitcher imageSwitcher;
	private Gallery gallery;
	private List<PicBean> lspb;
	private PicListAdapter adapter;
	
	@Override
	protected void onCreate(Bundle savedInstanceState) {
		// TODO Auto-generated method stub
		super.onCreate(savedInstanceState);
		setContentView(R.layout.imageswitcher_layout);
		
		imageSwitcher=(ImageSwitcher) findViewById(R.id.is_imageSwitcher);
		gallery=(Gallery) findViewById(R.id.is_gallery);
		
		//給ImageeSwitcher設置視圖工廠
		imageSwitcher.setFactory(this);
		
		lspb=new PicUtil().getdata(this);
		adapter=new PicListAdapter(this, lspb);
		
		gallery.setAdapter(adapter);
		//給Gallery添加選項選中事件的監聽
		gallery.setOnItemSelectedListener(new OnItemSelectedListener() {

			@Override
			public void onItemSelected(AdapterView<?> arg0, View arg1,
					int arg2, long arg3) {
				final PicBean pb=lspb.get(arg2);
				try {
					//獲取位圖對象
					Bitmap bm=BitmapFactory.decodeStream(ImageSwitcherActivity.this.getAssets().open(pb.getPath()));
					//創建位圖桌面對象
					BitmapDrawable drawable=new BitmapDrawable(bm);
					
					imageSwitcher.setImageDrawable(drawable);
					
				} catch (IOException e) {
					// TODO Auto-generated catch block
					e.printStackTrace();
				}
				
			}

			@Override
			public void onNothingSelected(AdapterView<?> arg0) {
				// TODO Auto-generated method stub
				
			}
		});
		
	}

	@Override
	public View makeView() {
		ImageView iv=new ImageView(this);
		
		//設置ImageView的等比例方法
		iv.setScaleType(ImageView.ScaleType.FIT_XY);
		
		//設置ImageView在ImageSwitcher中的位置,ImageView在ImageSwitcher中的寬和高於於ImageSwitcher相同
		iv.setLayoutParams(new ImageSwitcher.LayoutParams(LayoutParams.FILL_PARENT,LayoutParams.FILL_PARENT));
		
		return iv;
	}
}

四，com.util包下PicUtil.java

package com.util;
import android.content.Context;

import com.bean.*;

import java.io.IOException;
import java.util.*;
public class PicUtil {
	public List<PicBean> getdata(Context context){
		List<PicBean> lspic=new ArrayList<PicBean>();
		
		try {
			String[] fnames=context.getAssets().list("pic");
			for (String fname : fnames) {
				PicBean pb=new PicBean(fname, "pic/"+fname);
				lspic.add(pb);
			}
			
		} catch (IOException e) {
			// TODO Auto-generated catch block
			e.printStackTrace();
		}
		System.out.println("lspic-->"+lspic.size());
		return lspic;
	}
}

五，XML文件

1.imageswitcher_layout.xml

<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:id="@+id/RelativeLayout1"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:orientation="vertical" >

    <LinearLayout
        android:layout_width="match_parent"
        android:layout_height="320dp"
        android:layout_alignParentLeft="true"
        android:layout_alignParentTop="true"
        android:orientation="vertical" >

        <ImageSwitcher
            android:id="@+id/is_imageSwitcher"
            android:layout_width="match_parent"
            android:layout_height="match_parent" >
        </ImageSwitcher>

    </LinearLayout>

    <LinearLayout
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:layout_alignParentBottom="true"
        android:layout_alignParentLeft="true"
        >

        <Gallery
            android:id="@+id/is_gallery"
            android:layout_width="fill_parent"
            android:layout_height="120dp"
            android:spacing="15dp"
            />

    </LinearLayout>

</RelativeLayout>

2.gallery_item_layout.xml

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

    <LinearLayout
        android:layout_width="match_parent"
        android:layout_height="wrap_content" >

        <ImageView
            android:id="@+id/gallery_item_iv"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:src="@drawable/ic_launcher" />

    </LinearLayout>

</LinearLayout>

六，圖片路徑 放在assets下pic文件夾內
自己寫的，絕對OK能用！