Android之Gallery控件使用

首先是layout file:

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:orientation="vertical"
    android:layout_width="fill_parent"
    android:layout_height="fill_parent"
    >
<Gallery
    android:id="@+id/gallery"
    android:layout_width="fill_parent"
    android:layout_height="fill_parent"
    />
</LinearLayout>

接下来是代码,首先是需要定义一个BaseAdaper的子类来操作控制图片资源,然后在主类中通过Gallery.setAdapter(new ImageAdapter(this));来使用这个控制类。

package com.zx.galery;

import android.app.Activity;
import android.content.Context;
import android.os.Bundle;
import android.view.View;
import android.view.ViewGroup;
import android.widget.AdapterView;
import android.widget.BaseAdapter;
import android.widget.Gallery;
import android.widget.ImageView;
import android.widget.Toast;
import android.widget.AdapterView.OnItemClickListener;

public class GalleryTest extends Activity {
    private Gallery mGallery;
    
    /** Called when the activity is first created. */
    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.main);
        
        mGallery = (Gallery)findViewById(R.id.gallery);
        mGallery.setAdapter(new ImageAdapter(this));
        mGallery.setOnItemClickListener(new OnItemClickListener() {
            public void onItemClick(AdapterView parent, View v, int position, long id) {
                Toast.makeText(GalleryTest.this, "" + position, Toast.LENGTH_SHORT).show();
            }
        });
    }
    
    /*
     * class ImageAdapter is used to control gallery source and operation.
     */

    private class ImageAdapter extends BaseAdapter{
        private Context mContext;
        private Integer[] mImage = {
                R.drawable.sample_0,
                R.drawable.sample_1,
                R.drawable.sample_2,
                R.drawable.sample_3,
                R.drawable.sample_4,
                R.drawable.sample_5,
                R.drawable.sample_6,
                R.drawable.sample_7
        };
        
        public ImageAdapter(Context c){
            mContext = c;
        }
        @Override
        public int getCount() {
            // TODO Auto-generated method stub

            return mImage.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 i = new ImageView (mContext);
            i.setImageResource(mImage[position]);
            i.setScaleType(ImageView.ScaleType.FIT_XY);
            i.setLayoutParams(new Gallery.LayoutParams(136, 88));
            
            
            return i;
        }
        
    };
}

以上只是一个很简单的例子,下一步就是要将Gallery与ImageSwitcher结合起来做一个电子相册。

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