Android UI学习 - GridView和ImageView的使用

1. @Override 
2. public void onCreate(Bundle savedInstanceState) { 
3.     super.onCreate(savedInstanceState); 
4.  
5.     setContentView(R.layout.grid_2); 
6.  
7.     GridView g = (GridView) findViewById(R.id.myGrid); 
8.     g.setAdapter(new ImageAdapter(this)); 
9. } 

1. public class ImageAdapter extends BaseAdapter { 
2.     public ImageAdapter(Context c) { 
3.         mContext = c; 
4.     } 
5.  
6.     public int getCount() { 
7.         return mThumbIds.length; 
8.     } 
9.  
10.     public Object getItem(int position) { 
11.         return position; 
12.     } 
13.  
14.     public long getItemId(int position) { 
15.         return position; 
16.     } 
17.  
18.     public View getView(int position, View convertView, ViewGroup parent) { 
19.         ImageView imageView; 
20.         if (convertView == null) { 
21.             imageView = new ImageView(mContext); 
22.             imageView.setLayoutParams(new GridView.LayoutParams(45, 45));//设置ImageView宽高 
23.             imageView.setAdjustViewBounds(false); 
24.             imageView.setScaleType(ImageView.ScaleType.CENTER_CROP); 
25.             imageView.setPadding(8, 8, 8, 8); 
26.         } else { 
27.             imageView = (ImageView) convertView; 
28.         } 
29.  
30.         imageView.setImageResource(mThumbIds[position]); 
31.  
32.         return imageView; 
33.     } 
34.  
35.     private Context mContext; 
36.  
37.     private Integer[] mThumbIds = { 
38.             R.drawable.sample_thumb_0, R.drawable.sample_thumb_1, 
39.             R.drawable.sample_thumb_2, R.drawable.sample_thumb_3, 
40.             R.drawable.sample_thumb_4, R.drawable.sample_thumb_5, 
41.             R.drawable.sample_thumb_6, R.drawable.sample_thumb_7
42.     }; 
43. } 

1. <?xml version="1.0" encoding="utf-8"?> 
2. <GridView xmlns:android="http://schemas.android.com/apk/res/android"  
3.     android:id="@+id/myGrid" 
4.     android:layout_width="fill_parent"  
5.     android:layout_height="fill_parent" 
6.     android:padding="10dp" 
7.     android:verticalSpacing="10dp" 
8.      
9.     android:horizontalSpacing="10dp" 
10.     android:numColumns="auto_fit" 
11.     android:columnWidth="60dp" 
12.     android:stretchMode="columnWidth" 
13.      
14.     android:gravity="center" 
15.     /> 

1. //获得Bitmap的高和宽 
2. int bmpWidth=bmp.getWidth(); 
3. int bmpHeight=bmp.getHeight(); 
4.  
5. //设置缩小比例 
6. double scale=0.8; 
7. //计算出这次要缩小的比例 
8. scaleWidth=(float)(scaleWidth*scale); 
9. scaleHeight=(float)(scaleHeight*scale); 
10.  
11. //产生resize后的Bitmap对象 
12. Matrix matrix=new Matrix(); 
13. matrix.postScale(scaleWidth, scaleHeight); 
14. Bitmap resizeBmp=Bitmap.createBitmap(bmp, 0, 0, bmpWidth, bmpHeight, matrix, true); 

1. <ImageView 
2.     android:id="@+id/image" 
3.     android:layout_width="fill_parent"  
4.     android:layout_height="fill_parent" 
5.     android:scaleType="center" 
6.     android:src="@drawable/candle" 
7.     /> 

本文转自 Icansoft 51CTO博客原文链接 http://blog.51cto.com/android/316255