ListView中加入LinearLayout listview baseadapter 的filter

这个就要用到Android的API源码，我改写了下SimpleAdapter这个类（主要是重写一个setViewImage方法）。并命名为MyAdapter.java

另外添加了一个把URL资源转换成BitMap图像的类

代码如下：

public class UrlToBitmap {  
    private Bitmap bitmap;  
      
    /** 
     *  
     * @param myFileUrl An image of URL type  
     */  
    public UrlToBitmap(URL myFileUrl) {     
//         URL myFileUrl = null;     
            bitmap = null;       
             
           try {     
            HttpURLConnection conn = (HttpURLConnection) myFileUrl.openConnection();     
            conn.setDoInput(true);     
            conn.connect();     
            InputStream is = conn.getInputStream();     
            bitmap = BitmapFactory.decodeStream(is);     
            is.close();     
           } catch (IOException e) {     
            e.printStackTrace();     
           }      
        }   
    /** 
     *  
     * @return A Bitmap type 
     */  
    public Bitmap reutrnBitmap(){  
        return bitmap;  
    }  
}

下面是adapter

public class MyAdapter extends BaseAdapter implements Filterable {  
        private int[] mTo;  
        private String[] mFrom;  
        private ViewBinder mViewBinder;  
  
        private List<? extends Map<String, ?>> mData;  
  
        private int mResource;  
        private int mDropDownResource;  
        private LayoutInflater mInflater;  
  
        private SimpleFilter mFilter;  
        private ArrayList<Map<String, ?>> mUnfilteredData;  
  
        /** 
         * Constructor 
         *  
         * @param context The context where the View associated with this SimpleAdapter is running 
         * @param data A List of Maps. Each entry in the List corresponds to one row in the list. The 
         *        Maps contain the data for each row, and should include all the entries specified in 
         *        "from" 
         * @param resource Resource identifier of a view layout that defines the views for this list 
         *        item. The layout file should include at least those named views defined in "to" 
         * @param from A list of column names that will be added to the Map associated with each 
         *        item. 
         * @param to The views that should display column in the "from" parameter. These should all be 
         *        TextViews. The first N views in this list are given the values of the first N columns 
         *        in the from parameter. 
         */  
        public MyAdapter(Context context, List<? extends Map<String, ?>> data,  
                int resource, String[] from, int[] to) {  
            mData = data;  
            mResource = mDropDownResource = resource;  
            mFrom = from;  
            mTo = to;  
            mInflater = (LayoutInflater) context.getSystemService(Context.LAYOUT_INFLATER_SERVICE);  
        }  
  
          
        /** 
         * @see android.widget.Adapter#getCount() 
         */  
        public int getCount() {  
            return mData.size();  
        }  
  
        /** 
         * @see android.widget.Adapter#getItem(int) 
         */  
        public Object getItem(int position) {  
            return mData.get(position);  
        }  
  
        /** 
         * @see android.widget.Adapter#getItemId(int) 
         */  
        public long getItemId(int position) {  
            return position;  
        }  
  
        /** 
         * @see android.widget.Adapter#getView(int, View, ViewGroup) 
         */  
        public View getView(int position, View convertView, ViewGroup parent) {  
            return createViewFromResource(position, convertView, parent, mResource);  
        }  
  
        private View createViewFromResource(int position, View convertView,  
                ViewGroup parent, int resource) {  
            View v;  
            if (convertView == null) {  
                v = mInflater.inflate(resource, parent, false);  
            } else {  
                v = convertView;  
            }  
  
            bindView(position, v);  
  
            return v;  
        }  
  
        /** 
         * <p>Sets the layout resource to create the drop down views.</p> 
         * 
         * @param resource the layout resource defining the drop down views 
         * @see #getDropDownView(int, android.view.View, android.view.ViewGroup) 
         */  
        public void setDropDownViewResource(int resource) {  
            this.mDropDownResource = resource;  
        }  
  
        @Override  
        public View getDropDownView(int position, View convertView, ViewGroup parent) {  
            return createViewFromResource(position, convertView, parent, mDropDownResource);  
        }  
  
        private void bindView(int position, View view) {  
            final Map dataSet = mData.get(position);  
            if (dataSet == null) {  
                return;  
            }  
  
            final ViewBinder binder = mViewBinder;  
            final String[] from = mFrom;  
            final int[] to = mTo;  
            final int count = to.length;  
  
            for (int i = 0; i < count; i++) {  
                final View v = view.findViewById(to[i]);  
                if (v != null) {  
                    final Object data = dataSet.get(from[i]);  
                    String text = data == null ? "" : data.toString();  
                    if (text == null) {  
                        text = "";  
                    }  
  
                    boolean bound = false;  
                    if (binder != null) {  
                        bound = binder.setViewValue(v, data, text);  
                    }  
  
                    if (!bound) {  
                        if (v instanceof Checkable) {  
                            if (data instanceof Boolean) {  
                                ((Checkable) v).setChecked((Boolean) data);  
                            } else if (v instanceof TextView) {  
                                // Note: keep the instanceof TextView check at the bottom of these  
                                // ifs since a lot of views are TextViews (e.g. CheckBoxes).  
                                setViewText((TextView) v, text);  
                            } else {  
                                throw new IllegalStateException(v.getClass().getName() +  
                                        " should be bound to a Boolean, not a " +  
                                        (data == null ? "<unknown type>" : data.getClass()));  
                            }  
                        } else if (v instanceof TextView) {  
                            // Note: keep the instanceof TextView check at the bottom of these  
                            // ifs since a lot of views are TextViews (e.g. CheckBoxes).  
                            setViewText((TextView) v, text);  
                        } else if (v instanceof ImageView) {  
                            if (data instanceof Integer) {  
                                setViewImage((ImageView) v, (Integer) data);                              
                            } else if(data instanceof Bitmap){  
                                setViewImage((ImageView) v, (Bitmap) data);  
                            }                    
                            else {  
                                setViewImage((ImageView) v, text);  
                            }  
                        } else {  
                            throw new IllegalStateException(v.getClass().getName() + " is not a " +  
                                    " view that can be bounds by this SimpleAdapter");  
                        }  
                    }  
                }  
            }  
        }  
  
        /** 
         * Returns the {@link ViewBinder} used to bind data to views. 
         * 
         * @return a ViewBinder or null if the binder does not exist 
         * 
         * @see #setViewBinder(android.widget.SimpleAdapter.ViewBinder) 
         */  
        public ViewBinder getViewBinder() {  
            return mViewBinder;  
        }  
  
        /** 
         * Sets the binder used to bind data to views. 
         * 
         * @param viewBinder the binder used to bind data to views, can be null to 
         *        remove the existing binder 
         * 
         * @see #getViewBinder() 
         */  
        public void setViewBinder(ViewBinder viewBinder) {  
            mViewBinder = viewBinder;  
        }  
  
        public void setViewImage(ImageView v, Bitmap bm) {  
            try {  
                v.setImageBitmap(bm);  
            } catch (Exception e ) {  
                System.err.print("Erro in ViewImage");  
             }  
        }   
        /** 
         * Called by bindView() to set the image for an ImageView but only if 
         * there is no existing ViewBinder or if the existing ViewBinder cannot 
         * handle binding to an ImageView. 
         * 
         * This method is called instead of {@link #setViewImage(ImageView, String)} 
         * if the supplied data is an int or Integer. 
         * 
         * @param v ImageView to receive an image 
         * @param value the value retrieved from the data set 
         * 
         * @see #setViewImage(ImageView, String) 
         */  
        public void setViewImage(ImageView v, int value) {  
            v.setImageResource(value);  
        }  
  
        /** 
         * Called by bindView() to set the image for an ImageView but only if 
         * there is no existing ViewBinder or if the existing ViewBinder cannot 
         * handle binding to an ImageView. 
         * 
         * By default, the value will be treated as an image resource. If the 
         * value cannot be used as an image resource, the value is used as an 
         * image Uri. 
         * 
         * This method is called instead of {@link #setViewImage(ImageView, int)} 
         * if the supplied data is not an int or Integer. 
         * 
         * @param v ImageView to receive an image 
         * @param value the value retrieved from the data set 
         * 
         * @see #setViewImage(ImageView, int)  
         */  
        public void setViewImage(ImageView v, String value) {  
            try {  
                v.setImageResource(Integer.parseInt(value));  
            } catch (NumberFormatException nfe) {  
                v.setImageURI(Uri.parse(value));  
            }  
        }  
  
        /** 
         * Called by bindView() to set the text for a TextView but only if 
         * there is no existing ViewBinder or if the existing ViewBinder cannot 
         * handle binding to an TextView. 
         * 
         * @param v TextView to receive text 
         * @param text the text to be set for the TextView 
         */  
        public void setViewText(TextView v, String text) {  
            v.setText(text);  
        }  
  
        public Filter getFilter() {  
            if (mFilter == null) {  
                mFilter = new SimpleFilter();  
            }  
            return mFilter;  
        }  
  
        /** 
         * This class can be used by external clients of SimpleAdapter to bind 
         * values to views. 
         * 
         * You should use this class to bind values to views that are not 
         * directly supported by SimpleAdapter or to change the way binding 
         * occurs for views supported by SimpleAdapter. 
         * 
         * @see SimpleAdapter#setViewImage(ImageView, int) 
         * @see SimpleAdapter#setViewImage(ImageView, String) 
         * @see SimpleAdapter#setViewText(TextView, String) 
         */  
        public static interface ViewBinder {  
            /** 
             * Binds the specified data to the specified view. 
             * 
             * When binding is handled by this ViewBinder, this method must return true. 
             * If this method returns false, SimpleAdapter will attempts to handle 
             * the binding on its own. 
             * 
             * @param view the view to bind the data to 
             * @param data the data to bind to the view 
             * @param textRepresentation a safe String representation of the supplied data: 
             *        it is either the result of data.toString() or an empty String but it 
             *        is never null 
             * 
             * @return true if the data was bound to the view, false otherwise 
             */  
            boolean setViewValue(View view, Object data, String textRepresentation);  
        }  
  
        /** 
         * <p>An array filters constrains the content of the array adapter with 
         * a prefix. Each item that does not start with the supplied prefix 
         * is removed from the list.</p> 
         */  
        private class SimpleFilter extends Filter {  
  
            @Override  
            protected FilterResults performFiltering(CharSequence prefix) {  
                FilterResults results = new FilterResults();  
  
                if (mUnfilteredData == null) {  
                    mUnfilteredData = new ArrayList<Map<String, ?>>(mData);  
                }  
  
                if (prefix == null || prefix.length() == 0) {  
                    ArrayList<Map<String, ?>> list = mUnfilteredData;  
                    results.values = list;  
                    results.count = list.size();  
                } else {  
                    String prefixString = prefix.toString().toLowerCase();  
  
                    ArrayList<Map<String, ?>> unfilteredValues = mUnfilteredData;  
                    int count = unfilteredValues.size();  
  
                    ArrayList<Map<String, ?>> newValues = new ArrayList<Map<String, ?>>(count);  
  
                    for (int i = 0; i < count; i++) {  
                        Map<String, ?> h = unfilteredValues.get(i);  
                        if (h != null) {  
                              
                            int len = mTo.length;  
  
                            for (int j=0; j<len; j++) {  
                                String str =  (String)h.get(mFrom[j]);  
                                  
                                String[] words = str.split(" ");  
                                int wordCount = words.length;  
                                  
                                for (int k = 0; k < wordCount; k++) {  
                                    String word = words[k];  
                                      
                                    if (word.toLowerCase().startsWith(prefixString)) {  
                                        newValues.add(h);  
                                        break;  
                                    }  
                                }  
                            }  
                        }  
                    }  
  
                    results.values = newValues;  
                    results.count = newValues.size();  
                }  
  
                return results;  
            }  
  
            @Override  
            protected void publishResults(CharSequence constraint, FilterResults results) {  
                //noinspection unchecked  
                mData = (List<Map<String, ?>>) results.values;  
                if (results.count > 0) {  
                    notifyDataSetChanged();  
                } else {  
                    notifyDataSetInvalidated();  
                }  
            }  
        }  
      
}

最后，主程序代码如下

主Activity代码  
*/  
public class ListViewTest extends Activity {    
/** Called when the activity is first created. */    
    private ListView listv;    
    private String urladdress = "http://www.csdnimg.cn/www/images/csdnindex_logo.gif"; //图片的URL地址  
    @Override    
    public void onCreate(Bundle savedInstanceState) {    
    super.onCreate(savedInstanceState);    
    setContentView(R.layout.main);    
    listv = (ListView) findViewById(R.id.list); //关联到mian的ListView    
      
    ArrayList<Map<String, Object>> arrayl = new ArrayList<Map<String, Object>>();    
    Bitmap bm = new UrlToBitmap(urladdress).returnBitMap(); //先把URL资源转成Bitmap  
      
    for(int count = 0; count<15; count++){    
        Map<String, Object> map= new HashMap<String, Object>();    
        map.put(“image”, bm); //放入图片资源    
        map.put(“Text”, “This is a Listview , No. “+ count + ” !”); //放入计数器    
        arrayl.add(map);             
    }     
      
    //注意这里是MyAdapter  
    MyAdapter adapte = new MyAdapter(this,    
    R.layout.content,    
    new String[] {“image”, “Text”},    
    new int[]{R.id.img, R.id.text});  
      
    listv.setAdapter(adapter);    
    }      
 }