位图不显示在ListView中：来自SD卡的图像

Question

我一直在挣扎，因为SD卡的位图没有显示在列表视图中。主要问题是将位图包含在散列图（map.put(TAG_ICON, bm)）中，以便它可以在Listview中填充。我还打印了位图值android.graphics.Bitmap@41c4c650，并显示位图宽度：256。我只是想将图像包含在下面的列表视图中。希望听到你的建议的决心。谢谢。 Noob在这里。

的logcat：

resolveUri failed on bad bitmap uri: android.graphics.Bitmap@41c15540 
06-26 16:39:56.559: I/System.out(2312): resolveUri failed on bad bitmap uri: 
06-26 16:45:48.989: D/Bitmap not Null(2798): android.graphics.Bitmap@41c4c650 

的Java

//In the Main Activity just fetch all the data from MYSql 
    //Then save it to the database 
    //After saving, then do an intent to display the menu 
public class MainActivity extends ListActivity { 

    // Progress Dialog 
      private ProgressDialog pDialog; 
      Button bMain; 



      // Creating JSON Parser object 
      JSONParser jParser = new JSONParser(); 

      ArrayList<HashMap<String, ?>> productsList; 

      // url to get all products list 
      private static String url_all_products = ""; 

      // JSON Node names 
      private static final String TAG_SUCCESS = "success"; 
      private static final String TAG_PRODUCTS = "products"; 
      private static final String TAG_PID = "pid"; 
      private static final String TAG_NAME = "name"; 
      private static final String TAG_IMAGE_NAME = "imageName"; 
      private static final String TAG_ICON=null; 
      // products JSONArray 
      JSONArray products = null; 


      Bitmap bm =null; 



    @Override 
    protected void onCreate(Bundle savedInstanceState) { 
     super.onCreate(savedInstanceState); 



     //1*; 1.5*;2*;3; 
     //Identify the screen resolution 
     int screenSize = getResources().getConfiguration().screenLayout & 
       Configuration.SCREENLAYOUT_SIZE_MASK; 

     switch(screenSize) { 
      case Configuration.SCREENLAYOUT_SIZE_LARGE: 
       setContentView(R.layout.activity_main3); 
       Toast.makeText(this, "Large screen: "+screenSize,Toast.LENGTH_LONG).show(); 

       File folder = new File(Environment.getExternalStorageDirectory() + "/FinalTestforDatabase"); 
       boolean success1 = true; 
       if (!folder.exists()) { 
        success1 = folder.mkdir(); 
       } 
       if (success1) { 
        Toast.makeText(MainActivity.this, "Success: ",Toast.LENGTH_LONG).show(); 
       } else { 
        Toast.makeText(MainActivity.this, "Fail ",Toast.LENGTH_LONG).show(); 
       } 



      // Hashmap for ListView 
       productsList = new ArrayList<HashMap<String, ?>>(); 
       //bMain = (Button) findViewById(R.id.main); 

       // Loading products in Background Thread 
       new LoadAllProducts().execute(); 

       if(bm!=null) 
       { 
       ImageView img = (ImageView)findViewById(R.id.imageView1); 
       img.setImageBitmap(bm); 
       } 
       // Get listview 
       ListView lv = getListView(); 
       LayoutAnimationController controller = AnimationUtils.loadLayoutAnimation(this, R.anim.animlistview); 
       lv.setLayoutAnimation(controller); 

       // on seleting single product 
       // launching Edit Product Screen 
       lv.setOnItemClickListener(new OnItemClickListener() { 

        @Override 
        public void onItemClick(AdapterView<?> parent, View view, 
          int position, long id) { 
         // getting values from selected ListItem 
         String pid = ((TextView) view.findViewById(R.id.pid)).getText() 
           .toString(); 

         // Starting new intent 
         Intent in = new Intent(getApplicationContext(), 
           AlphaInActivity.class); 
         // sending pid to next activity 
         in.putExtra("TAG_PID", pid); 

         // starting new activity and expecting some response back 
         startActivityForResult(in, 100); 
         //Toast.makeText(this.getBaseContext(),pid, 
           //Toast.LENGTH_SHORT).show(); 
        } 
       }); 



       break; 
      case Configuration.SCREENLAYOUT_SIZE_NORMAL: 
       setContentView(R.layout.activity_main2); 
       Toast.makeText(this, "Normal screen",Toast.LENGTH_LONG).show(); 
       break; 
      case Configuration.SCREENLAYOUT_SIZE_SMALL: 
       setContentView(R.layout.activity_main2); 
       Toast.makeText(this, "Small screen",Toast.LENGTH_LONG).show(); 
       break; 
      default: 
       Toast.makeText(this, "Screen size is neither large, normal or small" , Toast.LENGTH_LONG).show(); 

     } 
    } 

    /** 
    * Background Async Task to Load all product by making HTTP Request 
    * */ 
    class LoadAllProducts extends AsyncTask<String, String, String> { 

     /** 
     * Before starting background thread Show Progress Dialog 
     * */ 
     @Override 
     protected void onPreExecute() { 
      super.onPreExecute(); 
      pDialog = new ProgressDialog(MainActivity.this); 
      pDialog.setMessage("Loading products. Please wait..."); 
      pDialog.setIndeterminate(false); 
      pDialog.setCancelable(false); 
      pDialog.show(); 
     } 

     /** 
     * getting All products from url 
     * */ 
     protected String doInBackground(String... args) { 
      // Building Parameters 
      List<NameValuePair> params = new ArrayList<NameValuePair>(); 
      // getting JSON string from URL 
      JSONObject json = jParser.makeHttpRequest(url_all_products, "GET", params); 

      // Check your log cat for JSON reponse 
      //Log.d("All Products: ", json.toString()); 

      try { 
       // Checking for SUCCESS TAG 
       int success = json.getInt(TAG_SUCCESS); 

       if (success == 1) { 
        // products found 
        // Getting Array of Products 
        products = json.getJSONArray(TAG_PRODUCTS); 



        // looping through All Products 
        for (int i = 0; i < products.length(); i++) { 
         JSONObject c = products.getJSONObject(i); 


         byte[] decodedString = Base64.decode(c.getString(TAG_IMAGE_NAME), Base64.DEFAULT); 
         Bitmap decodedByte = BitmapFactory.decodeByteArray(decodedString, 0, decodedString.length); 

         String fileN = (i+1)+".jpg"; 

         OutputStream fOut = null; 
         File file = new File(Environment.getExternalStorageDirectory() + "/FinalTestforDatabase/",fileN); 
          try { 
           fOut = new FileOutputStream(file); 
          } catch (FileNotFoundException e1) { 
           // TODO Auto-generated catch block 
           e1.printStackTrace(); 
          } 
          decodedByte.compress(Bitmap.CompressFormat.JPEG, 85, fOut); 
          try { 
           fOut.flush(); 
          } catch (IOException e2) { 
           // TODO Auto-generated catch block 
           e2.printStackTrace(); 
          } 
          try { 
           fOut.close(); 
          } catch (IOException e1) { 
           // TODO Auto-generated catch block 
           e1.printStackTrace(); 
          } 

       try { 
        MediaStore.Images.Media.insertImage(getContentResolver(),file.getAbsolutePath(),file.getName(),file.getName()); 
       } catch (FileNotFoundException e) { 
        // TODO Auto-generated catch block 
        e.printStackTrace(); 
       } 

         String id = c.getString(TAG_PID); 
         String name = c.getString(TAG_NAME); 
         // creating new HashMap 
         HashMap<String, Object> map = new HashMap<String, Object>(); 

         String fileName; 
         fileName = (i+1)+".jpg"; 

         File f = new File(Environment.getExternalStorageDirectory()+ "/FinalTestforDatabase/", fileName); 
         FileInputStream is = null; 
         try { 
          is = new FileInputStream(f); 
         } catch (FileNotFoundException e) { 
          Log.d("error: ",String.format("ShowPicture.java file[%s]Not Found",fileName)); 

         } 

         BitmapFactory.Options options = new BitmapFactory.Options(); 
          options.inTempStorage = new byte[2*1024]; 

         bm= BitmapFactory.decodeStream(is, null, options); 
         if(bm==null) 
         { 
          Log.d("Bitmap", "Null Value");       
         } 
         else 
         { 
          ; 
          Log.d("Bitmap not Null", bm.toString()); 
          Log.d("Bitmap Width", ""+bm.getWidth()); 
         } 

         //map.put(TAG_ICON, bm); 
         map.put(TAG_PID, name); 
         map.put(TAG_NAME, id); 




         // adding HashList to ArrayList 
         productsList.add(map); 

        } 
       } else { 
        // no products found 
        // Launch Add New product Activity 
        Intent i = new Intent(getApplicationContext(), 
          MainActivity.class); 
        // Closing all previous activities 
        i.addFlags(Intent.FLAG_ACTIVITY_CLEAR_TOP); 
        startActivity(i); 
       } 
      } catch (JSONException e) { 
       e.printStackTrace(); 

      } 

      return null; 
     } 

     private Bitmap getbitmap(byte[] bytesArray) { 

      try{ 

      byte[] decodedString2 = Base64.decode(bytesArray, Base64.DEFAULT); 
      Bitmap decodedByte2 = BitmapFactory.decodeByteArray(decodedString2, 0,decodedString2.length); 

      return decodedByte2; 

      }catch(Exception e){e.toString();} 
      return null; 


     } 

     /** 
     * After completing background task Dismiss the progress dialog 
     * **/ 
     protected void onPostExecute(String file_url) { 
      // dismiss the dialog after getting all products 
      pDialog.dismiss(); 
      // updating UI from Background Thread 
      runOnUiThread(new Runnable() { 
       public void run() { 
        /** 
        * Updating parsed JSON data into ListView 
        * */ 


        ListAdapter adapter = new SimpleAdapter(
         MainActivity.this, productsList, 
          R.layout.list_item, new String[] {TAG_ICON, TAG_PID, 
            TAG_NAME}, 
          new int[] {R.id.list_image, R.id.pid, R.id.name }); 
        //updating listview R.id.list_image, , 

        setListAdapter(adapter); 
       } 
      }); 

     } 

    } 

    @Override 
    public boolean onCreateOptionsMenu(Menu menu) { 
     // Inflate the menu; this adds items to the action bar if it is present. 
     getMenuInflater().inflate(R.menu.main, menu); 
     return true; 
    } 

    public class MyViewBinder implements ViewBinder { 

     public boolean setViewValue(View view, Object data, String textRepresentation) { 

      if ((view instanceof ImageView) & (data instanceof Bitmap)) { 

       ImageView iv = (ImageView) view; 

       Bitmap bm = (Bitmap) data; 

       iv.setImageBitmap(bm); 

       return true; 

      } 
      return false; 
     } 

    } 
} 

Answer 1

使用

adapter.setViewBinder(new MyViewBinder()); 



public class MyViewBinder implements ViewBinder { 

    @Override 
    public boolean setViewValue(View view, Object data, 

    String textRepresentation) { 

     if ((view instanceof ImageView) & (data instanceof Bitmap)) { 

      ImageView iv = (ImageView) view; 

      Bitmap bm = (Bitmap) data; 

      iv.setImageBitmap(bm); 

      return true; 

     } 
     return false; 
    } 

}