我试图昆虫数据到一个sqlite数据库，他们都是名字，从mysql数据库获取的消息和图像。问题是如何使用Blob昆虫图像..图像是从一个url获取的。我想把它放在sqite表中....我知道他们说最好把它保存在sd卡上，并把位置放在sqlite表中....但唯一的问题是，用户将能够删除一些图像或重命名他们，我不想。
这是我的sqlite数据库类

public class DBTool extends SQLiteOpenHelper {
    private Context appContext;
     static final String firstname="firstname";
     static final String lastname="lastname";
     
    public DBTool(Context applicationContext){
        
        super(applicationContext, "friend.db", null, 1);
        this.appContext = applicationContext;

    }
    @Override
    public void onCreate(SQLiteDatabase database) {
                
                String query = "CREATE TABLE friends ( contactId INTEGER PRIMARY KEY, name TEXT, " +
                        "message TEXT, image BLOB)";
                database.execSQL(query);
    }

    @Override
    public void onUpgrade(SQLiteDatabase database, int oldVersion, int newVersion) {
        
        String query = "DROP TABLE IF EXISTS friends";
        
        database.execSQL(query);
        onCreate(database);
        
    }
    
    public void insertContact(HashMap<String, String> queryValues){
        
        SQLiteDatabase database = this.getWritableDatabase();
        
    
        ContentValues values = new ContentValues();
        
        values.put("name", queryValues.get("name"));
        values.put("message", queryValues.get("message"));
        values.put("image", queryValues.get("image"));
        
        database.insert("friends", null, values);
        database.close();
        
    }
    
    public int updateContact(HashMap<String, String> queryValues){
        
        SQLiteDatabase database = this.getWritableDatabase();
        
        ContentValues values = new ContentValues();

        values.put("name", queryValues.get("name"));
        values.put("message", queryValues.get("message"));
        values.put("image", queryValues.get("image"));
        
        
        return database.update("friends", values, 
                "contactId" + " = ?", new String[] {queryValues.get("contactId") });
        
    }
    
    public void deleteContact(){
        
        SQLiteDatabase database = this.getWritableDatabase();
        
        String deleteQuery = "DELETE FROM friends ";
        
        database.execSQL(deleteQuery);
        
    }
    
    public ArrayList<HashMap<String, String>> getAllContacts(){
        
        ArrayList<HashMap<String, String>> contactArrayList = new ArrayList<HashMap<String, String>>();
    
    
         String selectQuery = "SELECT * FROM friends ";
        SQLiteDatabase database = this.getWritableDatabase();
        
        Cursor cursor = database.rawQuery(selectQuery, null);
        

        if(cursor.moveToFirst()){
            
            do{
                
                HashMap<String, String> contactMap = new HashMap<String, String>();
                
                contactMap.put("name", cursor.getString(0));
                contactMap.put("message", cursor.getString(1));
                contactMap.put("image", cursor.getString(2));
                
                
                contactArrayList.add(contactMap);
                
            } while(cursor.moveToNext());
            
        }
        return contactArrayList;
        
    }
    
    public HashMap<String, String> getContactInfo(String id){
        
        HashMap<String, String> contactMap = new HashMap<String, String>();
        
        SQLiteDatabase database = this.getReadableDatabase();
        
        String selectQuery = "SELECT * FROM friends WHERE contactId='" + id + "'";
        
        Cursor cursor = database.rawQuery(selectQuery, null);
        
        if(cursor.moveToFirst()){
            
            do{
                
                contactMap.put("name", cursor.getString(0));
                contactMap.put("message", cursor.getString(1));
                contactMap.put("image", cursor.getString(2));
                
            } while(cursor.moveToNext());
            
        }
        
        return contactMap;
        
    }
    
}

这是我的课，来获取数据和昆虫

public class Chat extends SherlockListFragment {
    JSONParser jsonParser = new JSONParser();
    private static final String TAG_POSTS = "posts";
    public static final String TAG_ID = "id";
    public static final String TAG_NAME = "name";
    public static final String TAG_pic = "pic";
    public static final String TAG_MESSAGE = "message";
    public static final String TAG_CATEGORIES_LOGO = "categories_logo";
    DBTool dbTool = new DBTool(getActivity());
    /*
  user details
    private static final String NAME = "name";
    private static final String AGE = "age";
    private static final String STATUS = "status";
    private static final String PIC = "pic";
    private static final String SEX = "sex"; String friendname,status;

    private static final String TAG_SUCCESS = "success";*/
        //user
    private static final String URL_CATEGORY = "http://10.0.2.2/ochat/selectchat.php";

        private ListView lv;
        SharedPreferences sp ;
        Bundle bon = new Bundle();

    @Override
    public View onCreateView(LayoutInflater inflater, ViewGroup container,
            Bundle savedInstanceState) {
        View rootView = inflater.inflate(R.layout.friends, container, false);
        return rootView;
    }
     @Override 
        public void onActivityCreated(Bundle savedInstanceState) {  
            super.onActivityCreated(savedInstanceState);  
        
            new LoadComments().execute(); 
 }
     
       class LoadComments extends AsyncTask<Void, Void, ArrayList<HashMap<String,String>>> {
            private ProgressDialog pDialog;
            @Override
            protected void onPreExecute() {
                super.onPreExecute();
                pDialog = new ProgressDialog(getActivity());
         
                pDialog.setIndeterminate(false);
                pDialog.setCancelable(true);
               
            }

            @Override
            protected ArrayList<HashMap<String, String>> doInBackground(Void... arg0) {

                  ArrayList<HashMap<String, String>> categoryList = new ArrayList<HashMap<String, String>>();
               
                SharedPreferences sp = PreferenceManager.getDefaultSharedPreferences(getActivity());
              String username = sp.getString("username", "anon");
                    List<NameValuePair> params = new ArrayList<NameValuePair>();
                    params.add(new BasicNameValuePair("username", username));
                  JSONObject json = jsonParser.makeHttpRequest(URL_CATEGORY, "POST",
                            params);
              
                  try {
                    
                      JSONArray categories = json.getJSONArray(TAG_POSTS);
                      for (int i = 0; i < categories.length(); i++) {
                          String id = categories.getJSONObject(i).getString("TAG_ID");
                          String name = categories.getJSONObject(i).getString("TAG_NAME");
                          String pic = categories.getJSONObject(i).getString("TAG_pic");
                          String message = categories.getJSONObject(i).getString("TAG_MESSAGE");
                      
                        HashMap<String, String> queryValuesMap =  new  HashMap<String, String>();
                        
                        queryValuesMap.put("name", name);
                        
                        queryValuesMap.put("message",message);
                        
                        DefaultHttpClient mHttpClient = new DefaultHttpClient();
                        HttpGet mHttpGet = new HttpGet(pic);
                        HttpResponse mHttpResponse = mHttpClient.execute(mHttpGet);
                        if (mHttpResponse.getStatusLine().getStatusCode() == HttpStatus.SC_OK) {
                          HttpEntity entity = mHttpResponse.getEntity();
                            if ( entity != null) {
                              // insert to database
                            queryValuesMap.put("image", EntityUtils.toByteArray(entity));
                              
                            }
                        }
             
                            
                            dbTool.insertContact(queryValuesMap);
                         
                      }
                  }catch (Throwable e){
                      e.printStackTrace();
                  }
                  return categoryList;
              }

            @Override
            protected void onPostExecute(ArrayList<HashMap<String, String>> result) {
                super.onPostExecute(result);

            
            }
        }
    }

问题出在
queryValuesMap.put（“image”，EntityUtils.toByteArray（entity））;
在说
类型HashMap〈String，String〉中的put（String，String）方法不适用于参数（String，byte[]）
我不知道这是我安排的方式还是有更好的方法来做这件事。