画廊视图Gallery

幻灯片图片浏览器

1.布局

<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"
    tools:context=".AndroidGalleryActivity" >

    <ImageSwitcher
        android:id="@+id/imgswi"
        android:layout_width="320dp"
        android:layout_height="320dp" />

    <Gallery
        android:id="@+id/gallery"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:layout_marginTop="25dp"
        android:unselectedAlpha="0.6"
        android:spacing="3pt"
         />

</LinearLayout>

2.逻辑控制

package com.example.androidgallery;

import android.os.Bundle;
import android.app.Activity;
import android.content.res.TypedArray;
import android.support.v4.view.ViewPager.LayoutParams;
import android.view.Menu;
import android.view.View;
import android.view.ViewGroup;
import android.view.animation.AnimationUtils;
import android.widget.AdapterView;
import android.widget.AdapterView.OnItemSelectedListener;
import android.widget.BaseAdapter;
import android.widget.Gallery;
import android.widget.ImageSwitcher;
import android.widget.ImageView;
import android.widget.ViewSwitcher.ViewFactory;

public class AndroidGalleryActivity extends Activity {

    int[] imageIds=new int[]{
    R.drawable.mm,
    R.drawable .mm2,
    R.drawable.mm3,
    R.drawable.mm4
    } ;
    
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_android_gallery);
        final Gallery gallery=(Gallery)this.findViewById(R.id.gallery);
        final ImageSwitcher imgswi=(ImageSwitcher)this.findViewById(R.id.imgswi);
        //设置ViewFactory对象
        imgswi.setFactory(new ViewFactory() {
            
            @Override
            public View makeView() {
                ImageView imageView=new ImageView(AndroidGalleryActivity.this);
                imageView.setBackgroundColor(0xff0000);
                imageView.setScaleType(ImageView.ScaleType.FIT_CENTER);
                imageView.setLayoutParams(new ImageSwitcher.LayoutParams(LayoutParams.WRAP_CONTENT,LayoutParams.WRAP_CONTENT));
                return imageView;
            }
        });
        //设置图片更换动画效果
        imgswi.setInAnimation(AnimationUtils.loadAnimation(this, android.R.anim.fade_in));
        imgswi.setOutAnimation(AnimationUtils.loadAnimation(this,android.R.anim.fade_out));
        //创建一个BaseAdapter对象，负责提供Gallery显示每张图片
        BaseAdapter adapter=new BaseAdapter() {
            
            @Override
            public View getView(int position, View convertview, ViewGroup parent) {
                //创建一个ImageView
                ImageView imageView=new ImageView(AndroidGalleryActivity.this);
                imageView.setImageResource(imageIds[position%imageIds.length]);
                //设置ImageView缩放类型
                imageView.setScaleType(ImageView.ScaleType.FIT_XY);
                imageView.setLayoutParams(new Gallery.LayoutParams(75,100));
                /*TypedArray typeArray=obtainStyledAttributes(R.styleable.Gallery);
                imageView.setBackgroundResource(TypedArray)*/
                return imageView;
            }
            
            @Override
            public long getItemId(int arg0) {
                // TODO Auto-generated method stub
                return arg0;
            }
            
            @Override
            public Object getItem(int arg0) {
                // TODO Auto-generated method stub
                return arg0;
            }
            
            @Override
            public int getCount() {
                // TODO Auto-generated method stub
                return imageIds.length;
            }
        };
        
        gallery.setAdapter(adapter);
        gallery.setOnItemSelectedListener(new OnItemSelectedListener() {

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

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

    @Override
    public boolean onCreateOptionsMenu(Menu menu) {
        // Inflate the menu; this adds items to the action bar if it is present.
        getMenuInflater().inflate(R.menu.activity_android_gallery, menu);
        return true;
    }

}