Gallery与衍生的BaseAdapter容器

新建一个继承Activity类的GalleryBaseAdapterActivity，并设置布局文件为：gallerybaseadapter.xml。

首先在布局文件中添加一个Gallery。

<?xmlversion="1.0"encoding="utf-8"?>

<LinearLayoutxmlns:android="http://schemas.android.com/apk/res/android"

    android:id="@+id/root"

    android:layout_width="match_parent"

    android:layout_height="match_parent"

    android:orientation="vertical">

 

    <Gallery

        android:id="@+id/gallerybaseadapter_gallery"

        android:layout_width="wrap_content"

        android:layout_height="wrap_content"/>

 

</LinearLayout>

在Activity代码中设置点击Gallery图片后，显示一个Dialog。

package lyx.feng.second;

 

import java.lang.reflect.Field;

import java.util.ArrayList;

import java.util.List;

import java.util.Random;

 

import lyx.feng.simpletextdemo.R;

import android.app.Activity;

import android.app.AlertDialog;

import android.graphics.Color;

import android.os.Bundle;

import android.view.View;

import android.view.ViewGroup;

import android.widget.AdapterView;

import android.widget.AdapterView.OnItemClickListener;

import android.widget.BaseAdapter;

import android.widget.Gallery;

import android.widget.ImageView;

import android.widget.LinearLayout;

 

@SuppressWarnings("deprecation")

public class GalleryBaseAdapterActivity extends Activity {

    private LinearLayoutroot = null;

    private Gallery gallery = null;

    private List<Integer>list = new ArrayList<Integer>();

 

    @Override

    protected void onCreate(Bundle savedInstanceState) {

       super.onCreate(savedInstanceState);

       super.setContentView(R.layout.gallerybaseadapter);

       this.root = (LinearLayout)super

              .findViewById(R.id.gallerybaseadapter_root);

       this.gallery = (Gallery)super

              .findViewById(R.id.gallerybaseadapter_gallery);

       Field fields[] = R.drawable.class.getDeclaredFields();

       for (int i = 0; i < fields.length; i++) {

           if (fields[i].getName().startsWith("icon_")) {

              try {

                  list.add(fields[i].getInt(R.drawable.class));

              } catch (IllegalAccessException e) {

                  // TODO Auto-generated catch block

                  e.printStackTrace();

              } catch (IllegalArgumentException e) {

                  // TODO Auto-generated catch block

                  e.printStackTrace();

              }

           }

       }

       this.gallery.setAdapter(new ImageAdapter());

       this.gallery.setOnItemClickListener(new OnItemClickListener() {

 

           @Override

           public void onItemClick(AdapterView<?> parent, View view,

                  int position,long id) {

              root.setBackgroundColor(Color.rgb(new Random().nextInt(255),

                     new Random().nextInt(255),new Random().nextInt(255)));

              AlertDialog.Builder builder = new AlertDialog.Builder(

                     GalleryBaseAdapterActivity.this);

              ImageView imageView = new ImageView(

                     GalleryBaseAdapterActivity.this);

              imageView.setScaleType(ImageView.ScaleType.FIT_XY);

              imageView.setImageResource(list.get(gallery

                     .getSelectedItemPosition()));

              builder.setView(imageView);

              builder.create().show();

           }

       });

 

    }

 

    private class ImageAdapter extends BaseAdapter {

 

       @Override

       public int getCount() {

           returnlist.size();

       }

 

       @Override

       public Object getItem(int position) {

           returnlist.get(position);

       }

 

       @Override

       public long getItemId(int position) {

           return position;

       }

 

       @Override

       publicView getView(int position,View convertView, ViewGroup parent) {

           ImageView view = new ImageView(GalleryBaseAdapterActivity.this);

           view.setImageResource(list.get(position));

           return view;

       }

 

    }

}