Android GridView的使用

Android的GridView控件用於把一系列的空間組織成一個二維的網格顯示出來應用的比較多的就是組合圖片顯示下面我就詳細講一個例子

首先寫一個類繼承BaseAdapter

public class ImageList extends BaseAdapter {  
      
        public Bitmap[] image;  
        Activity activity;  
          
        // construct  
        public ImageList(Activity a) {  
            activity = a;  
        }  
        @Override 
        public int getCount() {  
            // TODO Auto-generated method stub  
            return image.length;  
        }  
        @Override 
        public Object getItem(int position) {  
            // TODO Auto-generated method stub  
            return image[position];  
        }  
        @Override 
        public long getItemId(int position) {  
            // TODO Auto-generated method stub  
            return position;  
        }  
        public View getView(int position, View convertView, ViewGroup parent) {  
            // TODO Auto-generated method stub  
            ImageView imageView;  
            if (convertView == null) {  
                imageView = new ImageView(activity);  
                imageView.setLayoutParams(new GridView.LayoutParams(50, 50));// 設置ImageView寬高  
                imageView.setAdjustViewBounds(false);  
                imageView.setScaleType(ImageView.ScaleType.CENTER_CROP);  
                  
            } else {  
                imageView = (ImageView) convertView;  
            }  
            imageView.setImageBitmap(image[position]);  
              
            return imageView;  
        }  
        public static Bitmap drawableToBitmap(Drawable drawable) {    
                
            Bitmap bitmap = Bitmap    
                            .createBitmap(    
                                            drawable.getIntrinsicWidth(),    
                                            drawable.getIntrinsicHeight(),    
                                            drawable.getOpacity() != PixelFormat.OPAQUE ? Bitmap.Config.ARGB_8888    
                                                            : Bitmap.Config.RGB_565);    
            Canvas canvas = new Canvas(bitmap);    
            drawable.setBounds(0, 0, drawable.getIntrinsicWidth(), drawable.getIntrinsicHeight());    
            drawable.draw(canvas);    
            return bitmap;    
    }    
    }  

然後在主程序裡

final GridView gv = (GridView) findViewById(R.id.grid);  
                ImageList adapter = new ImageList(available.this);  
                Resources res=getResources();    
                Bitmap bmp=BitmapFactory.decodeResource(res, R.drawable.logo);    
                adapter.image=new Bitmap[20];  
                for(int i=0;i<=19;i++)  
                {  
                    adapter.image[i]=bmp;  
                }  
gv.setAdapter(adapter);  
                gv.setOnItemClickListener(new OnItemClickListener() {  
                    @Override 
                    public void onItemClick(AdapterView<?> arg0, View arg1,  
                            int arg2, long arg3) {  
                        // TODO Auto-generated method stub  
                        Log.i("phb", arg2 + "");  
                        Log.i("phbsel",gv.isFocused()+"");  
                        Intent i=new Intent(available.this, com.mobile.links.shop.mycx.shopcart.class);  
                        startActivity(i);  
                    }  
                });  
               gv.setOnItemSelectedListener(new OnItemSelectedListener(){  
                @Override 
                public void onItemSelected(AdapterView<?> arg0, View arg1,  
                        int arg2, long arg3) {  
                    // TODO Auto-generated method stub  
                    Log.i("selected",arg2+"");  
                    tv.setText(arg2+":detail");  
                }  
                @Override 
                public void onNothingSelected(AdapterView<?> arg0) {  
                    // TODO Auto-generated method stub  
                      
                }  
                     
               });  
                 

其中onClick函數是判斷被點擊

而onSelect函數是判斷被選中 也就是獲得焦點的imageview

這樣我們就可以基於gridview來做一些應用了。

構建gridview的xml代碼

<?xml version="1.0" encoding="utf-8"?> 
<LinearLayout 
android:id="@+id/relativelayout" 
android:layout_width="fill_parent" 
android:layout_height="fill_parent" 
xmlns:android="http://schemas.android.com/apk/res/android" 
android:orientation="vertical" 
> 
<GridView android:id="@+id/availgrid"   
  android:layout_width="fill_parent"   
  android:layout_height="wrap_content"   
  android:numColumns="4"   
  android:verticalSpacing="30dp"   
  android:layout_centerHorizontal = "true" 
    
  />   
   
   
</LinearLayout>