菜鸟Android学习31——图片预览窗口

xml文件代码：

<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="fill_parent"
    android:layout_height="fill_parent"
    android:orientation="vertical" >

    <ImageSwitcher
        android:id="@+id/imageSwitcher1"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:padding="20sp" >
    </ImageSwitcher>
 
    <GridView
        android:id="@+id/gridView1"
        android:layout_width="640sp"
        android:layout_height="match_parent"
        android:layout_marginTop="10sp"
        android:horizontalSpacing="3sp"
        android:verticalSpacing="3sp"
        android:numColumns="4" >  
    </GridView>
</LinearLayout>

activity_main。java文件代码

private int[] imageId = new int[]{R.drawable.image01,
   R.drawable.image02,R.drawable.image03,R.drawable.image04,
   R.drawable.image05,R.drawable.image06,R.drawable.image07,
   R.drawable.image08,R.drawable.image09,R.drawable.image10,
   R.drawable.image11,R.drawable.image12
 };
 private ImageSwitcher imageSwitcher;

 @Override
 protected void onCreate(Bundle savedInstanceState) {
  super.onCreate(savedInstanceState);
  setContentView(R.layout.activity_main);
  
  imageSwitcher = (ImageSwitcher)findViewById(R.id.imageSwitcher1);
  imageSwitcher.setInAnimation(AnimationUtils.loadAnimation(this, android.R.anim.fade_in));
  imageSwitcher.setInAnimation(AnimationUtils.loadAnimation(this, android.R.anim.fade_out));
  imageSwitcher.setFactory(new ViewFactory() {
   
   @Override
   public View makeView() {
    ImageView imageView = new ImageView(MainActivity.this);
    imageView.setScaleType(ImageView.ScaleType.FIT_CENTER);
    imageView.setLayoutParams(new ImageSwitcher.LayoutParams(LayoutParams.WRAP_CONTENT,LayoutParams.WRAP_CONTENT));
    
  
    // TODO Auto-generated method stub
    return imageView;
   }
  });
  imageSwitcher.setImageResource(imageId[5]);
  GridView gridView = (GridView)findViewById(R.id.gridView1);
  BaseAdapter adapter = new BaseAdapter() {
   
   @Override
   public View getView(int position, View convertView, ViewGroup parent) {
    ImageView imageView;
    if(convertView == null){
     imageView = new ImageView(MainActivity.this);
//     设置图像的宽带和高度
     imageView.setAdjustViewBounds(true);
     imageView.setMaxHeight(150);
     imageView.setMaxWidth(150);
//     设置内边距
     imageView.setPadding(5, 5, 5, 5);
     }else{
      imageView = (ImageView)convertView;
     }
    imageView.setImageResource(imageId[position]);
    return imageView;
   }
   
   @Override
   public long getItemId(int position) {
    // TODO Auto-generated method stub
    return position;
   }
   
   @Override
   public Object getItem(int position) {
    // TODO Auto-generated method stub
    return position;
   }
   
   @Override
   public int getCount() {
    // TODO Auto-generated method stub
    return imageId.length;
   }
  };
  gridView.setAdapter(adapter);
  gridView.setOnItemClickListener(new OnItemClickListener() {

   @Override
   public void onItemClick(AdapterView<?> arg0, View arg1, int arg2,
     long arg3) {
    imageSwitcher.setImageResource(imageId[arg2]);// TODO Auto-generated method stub
    
   }
   
  });

效果如下：