在Android中縮放圖庫的中心圖像

Question

請指導我...我希望畫廊的中心圖像放大。我怎樣才能做到這一點。

Answer 1

這將需要一些工作。使用相對佈局，將圖像放置爲layout_width = fill_parent，layout_height = fill_parent（根據需要設置圖像比例），並將圖庫部分與屏幕底部對齊。然後使用您的自定義主題自定義圖庫以使其透明。

Answer 2

main.xml中

<?xml version="1.0" encoding="utf-8"?> 
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android" 
    android:orientation="vertical" 
    android:layout_width="fill_parent" 
    android:layout_height="fill_parent" 
    > 


<ImageView 
    android:id="@+id/ImageView01" 
    android:layout_width="fill_parent" 
    android:layout_height="fill_parent"></ImageView> 
    <Gallery 
    android:id="@+id/Gallery01" 
    android:layout_width="fill_parent" 
    android:layout_height="wrap_content" 
    android:layout_alignParentBottom="true" 

    ></Gallery> 
</RelativeLayout> 

活動

public class GalleryView extends Activity { 
     Integer[] pics = { 
       R.drawable.antartica1, 
       R.drawable.antartica2, 
       R.drawable.antartica3, 
       R.drawable.antartica4, 
       R.drawable.antartica5, 
       R.drawable.antartica6, 
       R.drawable.antartica7, 
       R.drawable.antartica8, 
       R.drawable.antartica9, 
       R.drawable.antartica10 
     }; 
     ImageView imageView; 
     // int i=0,j,k; 

     /** Called when the activity is first created. */ 
     @Override 
     public void onCreate(Bundle savedInstanceState) { 
      super.onCreate(savedInstanceState); 
      setContentView(R.layout.main); 

      Gallery ga = (Gallery)findViewById(R.id.Gallery01); 
      ga.setAdapter(new ImageAdapter(this)); 

      imageView = (ImageView)findViewById(R.id.ImageView01); 
      /*i=ga.getSelectedItemPosition(); 
      j=ga.getFirstVisiblePosition(); 
      k=ga.getLastVisiblePosition();*/ 

      ga.setOnItemSelectedListener(new OnItemSelectedListener() { 


       @Override 
       public void onItemSelected(AdapterView<?> arg0, View arg1, 
         int arg2, long arg3) { 
        // TODO Auto-generated method stub 
        imageView.setBackgroundResource(pics[arg2]); 

       } 

       @Override 
       public void onNothingSelected(AdapterView<?> arg0) { 
        // TODO Auto-generated method stub 
       } 
      }); 


      ga.setOnItemClickListener(new OnItemClickListener() { 

       @Override 
       public void onItemClick(AdapterView<?> arg0, View arg1, int arg2, 
         long arg3) { 
        Toast.makeText(getBaseContext(), 
          "You have selected picture " + (arg2+1) + " of Antartica", 
          Toast.LENGTH_SHORT).show(); 
        //imageView.setImageResource(pics[arg2]); 
        imageView.setBackgroundResource(pics[arg2]); 


       } 

      }); 

     } 


     public class ImageAdapter extends BaseAdapter { 

      private Context ctx; 
      int imageBackground; 

      public ImageAdapter(Context c) { 
       ctx = c; 
       TypedArray ta = obtainStyledAttributes(R.styleable.Gallery1); 
       imageBackground = ta.getResourceId(R.styleable.Gallery1_android_galleryItemBackground, 1); 
       ta.recycle(); 
      } 
     @Override 
     public int getCount() { 

      return pics.length; 
     } 

     @Override 
     public Object getItem(int arg0) { 

      return arg0; 
     } 

     @Override 
     public long getItemId(int arg0) { 

      return arg0; 
     } 

     @Override 
     public View getView(int arg0, View arg1, ViewGroup arg2) { 
      ImageView iv = new ImageView(ctx); 
      iv.setImageResource(pics[arg0]); 
      iv.setScaleType(ImageView.ScaleType.FIT_XY); 
      iv.setLayoutParams(new Gallery.LayoutParams(150,120)); 
      iv.setBackgroundResource(imageBackground); 
      return iv; 
     } 

    } 
}