Android 图片浏览器Gallery的简单应用

这周利用休息时间又学习了Gallery，然后随便写了一个图片浏览的东东。

首先看一下界面：

点击下面的图片，在上面相应的显示出来。

代码如下：

<?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" >

        <ImageView
            android:id="@+id/imageView"
            android:layout_width="match_parent"
            android:layout_height="wrap_content"
            android:background="@drawable/star_red"
            android:scaleType="matrix" 
            android:layout_weight="4"
            />

        <Gallery
            android:id="@+id/gallery"
            android:layout_width="fill_parent"
            android:layout_height="wrap_content"
            android:layout_gravity="center_vertical"
            android:layout_weight="1"
            android:spacing="5dp" >

        </Gallery>

</LinearLayout>

package com.example.griview;

import javax.xml.parsers.SAXParser;
import javax.xml.parsers.SAXParserFactory;

import org.xml.sax.helpers.DefaultHandler;
import org.xmlpull.v1.XmlSerializer;

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

public class MainActivity extends Activity {

    private Gallery gallery;
    private ImageView imageView;
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.relative);
        gallery=(Gallery) findViewById(R.id.gallery);
        imageView=(ImageView) findViewById(R.id.imageView);
        gallery.setAdapter(new ImageAdapter(this));

        gallery.setOnItemClickListener(new OnItemClickListener() {

            public void onItemClick(AdapterView<?> parent, View view, int position,
                    long id) {
                imageView.setBackgroundResource(mThumbIds[position]);
                //弹出单击的GridView元素的位置 
                Toast.makeText(MainActivity.this, mThumbIds[position], Toast.LENGTH_LONG).show();
            }
        
        
        });
        
    }

    public class ImageAdapter extends BaseAdapter{

        private Context mContext;
        //声明ImageAdapter
        public ImageAdapter(Context context)
        {
            this.mContext=context;
        }
        //获取图片的个数
        public int getCount() {
            return mThumbIds.length;
        }

        //获取图片在库中的位置
        public Object getItem(int position) {
            return mThumbIds[position];
        }

        //获取图片在库中的位置
        public long getItemId(int position) {
            return 0;
        }

        public View getView(int position, View convertView, ViewGroup parent) {
            
            ImageView imageView;
            if(convertView==null)
            {
                imageView=new ImageView(mContext);
                 imageView.setLayoutParams(new Gallery.LayoutParams(75, 75));  
                    imageView.setScaleType(ImageView.ScaleType.FIT_CENTER);  
                    imageView.setPadding(8, 8, 8, 8);  
                }
            else{  
                    imageView = (ImageView) convertView;  
                } 
            
                imageView.setImageResource(mThumbIds[position]);  
                return imageView;  
        }
        
    }
    
    //展示图片
    private Integer[] mThumbIds={
            R.drawable.heart,
            R.drawable.heart_broken,
            R.drawable.heart_delete,
            R.drawable.heart_preferences,
            R.drawable.heart_edit,
            R.drawable.heart_new,
            R.drawable.star_red,
            R.drawable.meishi3,
            R.drawable.meishi4,
            R.drawable.meishi5,
    };
    public boolean onCreateOptionsMenu(Menu menu) {
        // Inflate the menu; this adds items to the action bar if it is present.
        getMenuInflater().inflate(R.menu.main, menu);
        return true;
    }

}

这周就学到这点，期待下一次学习的进步...