android 这 Gallery的使用

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原文引用：http://blog.csdn.net/hellogv/article/details/5961525

使用 Gallery 查看图片：

main.xml

<?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"      android:id="@+id/testImageView"    >      <Gallery   android:id="@+id/gallery"  android:layout_height="fill_parent"  android:layout_width="fill_parent"  ></Gallery>  </LinearLayout>

GallerydemoActivity.java

package com.hkrt;import java.lang.reflect.Field;import java.util.ArrayList;import android.app.Activity;import android.content.Context;import android.graphics.Bitmap;import android.graphics.BitmapFactory;import android.os.Bundle;import android.util.DisplayMetrics;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.AdapterView.OnItemClickListener;public class GallerydemoActivity extends Activity {private Gallery mGallery;  ///获取手机屏幕分辨率的类       private DisplayMetrics dm;      @Override      public void onCreate(Bundle savedInstanceState) {          super.onCreate(savedInstanceState);          setContentView(R.layout.main);                    mGallery = (Gallery)findViewById(R.id.gallery);          try {              mGallery.setAdapter(new ImageAdapter(this));          } catch (IllegalArgumentException e) {              e.printStackTrace();          } catch (IllegalAccessException e) {              e.printStackTrace();          }          mGallery.setOnItemClickListener(new OnItemClickListener() {              public void onItemClick(AdapterView parent, View v, int position, long id) {//                TextView testImageView = (TextView)  findViewById(R.id.testImageView);//                testImageView.setText(String.valueOf(position));              }          });      }            /*      * class ImageAdapter is used to control gallery source and operation.      */      private class ImageAdapter extends BaseAdapter{          private Context mContext;          private ArrayList<Integer> imgList=new ArrayList<Integer>();          private ArrayList<Object> imgSizes=new ArrayList<Object>();          public ImageAdapter(Context c) throws IllegalArgumentException, IllegalAccessException{              mContext = c;                            //用反射机制来获取资源中的图片ID和尺寸              Field[] fields = R.drawable.class.getDeclaredFields();              for (Field field : fields)              {                  if (!"icon".equals(field.getName()))//除了icon之外的图片                  {                         int index=field.getInt(R.drawable.class);                      //保存图片ID                      imgList.add(index);                      //保存图片大小                      int size[]=new int[2];                      Bitmap bmImg=BitmapFactory.decodeResource(getResources(),index);                      dm = new DisplayMetrics();                       getWindowManager().getDefaultDisplay().getMetrics(dm);                               //获得手机的宽度和高度像素单位为px                       size[0]=dm.widthPixels;//bmImg.getWidth();                    size[1]=dm.heightPixels;//bmImg.getHeight();                     imgSizes.add(size);                  }              }          }          @Override          public int getCount() {              // TODO Auto-generated method stub                return imgList.size();          }            @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);              //从imgList取得图片ID              i.setImageResource(imgList.get(position).intValue());              i.setScaleType(ImageView.ScaleType.FIT_XY);              //从imgSizes取得图片大小              int size[]= new int[2];              size=(int[]) imgSizes.get(position);              i.setLayoutParams(new Gallery.LayoutParams(size[0], size[1]));              return i;          }                };  }

效果图：