Android基础TOP6_3：Gally和ImageSwitcher实现画廊

结构：

Activity：

<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:orientation="vertical"
    android:paddingBottom="@dimen/activity_vertical_margin"
    android:paddingLeft="@dimen/activity_horizontal_margin"
    android:paddingRight="@dimen/activity_horizontal_margin"
    android:paddingTop="@dimen/activity_vertical_margin"
    tools:context="com.example.top6_3.MainActivity" >
   <Gallery 
    android:id="@+id/gly"
    android:layout_height="60dp"
    android:layout_width="fill_parent"
    android:animationDuration="1000"
    android:gravity="center_vertical"
    android:spacing="20dp"
    android:unselectedAlpha="0.5"
    android:background="#55000000"
     />
<ImageSwitcher 
    android:paddingTop="10dp"
    android:id="@+id/is"
    android:layout_width="wrap_content"
    android:layout_height="match_parent"></ImageSwitcher>

</LinearLayout>

JAVA:

MainActivity类：

package com.example.top6_3;




import android.app.Activity;
import android.os.Bundle;
import android.view.Menu;
import android.view.MenuItem;
import android.view.View;
import android.view.animation.Animation;
import android.view.animation.AnimationUtils;
import android.widget.Gallery.LayoutParams;
import android.widget.AdapterView;
import android.widget.Gallery;
import android.widget.ImageSwitcher;
import android.widget.ImageView;
import android.widget.ViewSwitcher.ViewFactory;


public class MainActivity extends Activity {
    private Gallery gal;
    private ImageView iv;
    private ImageAdapter adapter; 
    private ImageSwitcher is;
    private static final int[]  imgslds={
        R.drawable.bjl,
        R.drawable.dfhgc,
        R.drawable.fg,
        R.drawable.gj
};
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
         is=(ImageSwitcher) findViewById(R.id.is);
         is.setFactory(new ViewFactory() {
            
            @Override
            public View makeView() {
                // TODO Auto-generated method stub
                ImageView i=new ImageView(getApplicationContext());
                //i.setBackgroundColor(0Xff000000);
                i.setScaleType(ImageView.ScaleType.FIT_CENTER);
                i.setLayoutParams(new ImageSwitcher.LayoutParams(LayoutParams.MATCH_PARENT,
                        LayoutParams.MATCH_PARENT));
                return i;
            }
        });
         is.setInAnimation(AnimationUtils.loadAnimation(this, android.R.anim.fade_in));
      is.setOutAnimation(AnimationUtils.loadAnimation(this, android.R.anim.fade_out));
      gal=(Gallery) findViewById(R.id.gly);
      adapter=new ImageAdapter(this);
      gal.setAdapter(adapter);
       gal.setOnItemSelectedListener(gaILidstener);
       }
           private Gallery.OnItemSelectedListener gaILidstener=new Gallery.OnItemSelectedListener() {

           @Override
           public void onItemSelected(AdapterView<?> parent, View view,
                   int position, long id) {
               // TODO Auto-generated method stub
               is.setImageResource(imgslds[position]);
           }

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

ImageAdapter类：

package com.example.top6_3;

import android.R.integer;
import android.content.Context;
import android.view.Gravity;
import android.view.View;
import android.view.ViewGroup;
import android.widget.BaseAdapter;
import android.widget.Gallery;
import android.widget.ImageView;

public class ImageAdapter extends BaseAdapter {
    private Context context;
    
    private static final int[]  imgslds={
        R.drawable.bjl,
        R.drawable.dfhgc,
        R.drawable.fg,
        R.drawable.gj
};
    public ImageAdapter(Context c){
        context=c;
        
    }
    public int getCount() {
        // TODO Auto-generated method stub
        //
        return imgslds.length;
        
    }

    @Override
    public Object getItem(int position) {
        // TODO Auto-generated method stub
        return position;
    }

    @Override
    public long getItemId(int position) {
        // TODO Auto-generated method stub
        return position;
    }

    @Override
    public View getView(int position, View convertView, ViewGroup parent) {
        // TODO Auto-generated method stub
        ImageView iv=new ImageView(context);
        iv.setImageResource(imgslds[position]);
        iv.setScaleType(ImageView.ScaleType.FIT_CENTER);
        iv.setLayoutParams(new Gallery.LayoutParams(120,80));
        //iv.setBackgroundResource(R.drawable.bjl);
        return iv; 
        
    }

}

效果图：