Android

Question

我有两个活动，我在下一个Activity中实现了更新查询，我希望在我的List-view中添加更新的行，该行位于Previous Activity中。我尝试更新数据库表行但列表视图没有更新。我怎么能解决这个问题。可以有人帮助我。

这是我在数据库助手类

中的Sq Lite中的填充列表视图

public List<All_Post> getAllDescriptions()
     {
        List<All_Post> allPostDescList = new ArrayList<All_Post>();
        String selectQuery = "select * from  " + Table_AllPost_Table + " where  ActiveStatus = '1' ORDER BY ActionDate DESC";

        db = this.getWritableDatabase();
        Cursor cursor = db.rawQuery(selectQuery, null);

        if (cursor.moveToFirst()) {
            do
            {
                All_Post allPostDesc = new All_Post();
                allPostDesc.setID(cursor.getInt(cursor.getColumnIndex("ALL_ACT_ID")));
                allPostDesc.setStrActiveStatus(cursor.getString(cursor.getColumnIndex("ActiveStatus")));
                allPostDesc.setStrActivityId(cursor.getString(cursor.getColumnIndex("ActivityId")));
                allPostDesc.setStrRemark(cursor.getString(cursor.getColumnIndex("Remark")));
                allPostDesc.setStringInspectorname(cursor.getString(cursor.getColumnIndex("inspectorName")));
                allPostDesc.setStrNotationNo(cursor.getString(cursor.getColumnIndex("HashTag")));
                allPostDesc.setStrShortName(cursor.getString(cursor.getColumnIndex("Type_ShortRGN")));
                allPostDesc.setStrUserId(cursor.getString(cursor.getColumnIndex("UserId")));
                allPostDesc.setStrvessel_Id(cursor.getString(cursor.getColumnIndex("VesselId")));
                String strSqliteDate = cursor.getString(cursor.getColumnIndex("ActionDate"));
                DateFormat outputFormat = new SimpleDateFormat("yyyy-MM-dd", Locale.ENGLISH);
                Date parsed = null;
                try
                {
                    parsed = outputFormat.parse(strSqliteDate);
                } catch (ParseException e) {
                    // TODO Auto-generated catch block
                    e.printStackTrace();
                }
                String outputText = outputFormat.format(parsed);

                allPostDesc.setActiondate(outputText);

                allPostDescList.add(allPostDesc);
            } while (cursor.moveToNext());
        }
         cursor.close();
         db.close();
        return allPostDescList;
    }

这是我来自Sq Lite的填充列表视图

@Override
    protected void onCreate(Bundle savedInstanceState) {

        super.onCreate(savedInstanceState);
        setContentView(R.layout.all_post);

        ctx = this;

        dbhelper = new MyDbHelper(this);
        dbhelper.onOpen(db);

        imgLeftmenu = (ImageView) findViewById(R.id.imgLeftMenu);
        imgSearch = (ImageView) findViewById(R.id.imgSearch);
        imgAdd = (ImageView) findViewById(R.id.imgAdd);

        listView = (ListView) findViewById(R.id.listview_AllPost);
        Log.e(" After "," Filter Screen !!! ");
        populateList();

}

 @Override
    protected void onResume() {
        super.onResume();
        populateList();
    }
    private void populateList() {
            descArray.clear();

            List<All_Post> allDesc = dbhelper.getAllDescriptions();
            for (All_Post all_Post : allDesc)
            {
                String strInspectorname = all_Post.getStringInspectorname();
                Log.e("strInspectorname "," = " + strInspectorname);
                descArray.add(all_Post);
            }

            if (adapter == null)
            {
                Log.e("Adapter ", " == Null !!!! ");
                adapter = new MyListAdapter(this, R.layout.all_post_row, descArray);
                listView.setAdapter(adapter);

            }
            else if (adapter != null)
            {
                Log.e("Adapter ", " != Null !!!! ");
                adapter.notifyDataSetChanged();
                adapter = new MyListAdapter(this, R.layout.all_post_row, descArray);
                listView.setFastScrollEnabled(true);
                listView.setAdapter(adapter);
            }
        }

这是我在onCreate（）

中的另一个下一个活动代码

  public void onCreate(Bundle savedInstanceState)
    {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.filter_screen);
        ctx = this;
        Log.e("I m", " in Filter !!!");
        dbhelper = new MyDbHelper(this);
        dbhelper.onOpen(db);

        SharedPreferences sharedPreferences = PreferenceManager.getDefaultSharedPreferences(getApplicationContext());
        str_Authentication_Token = sharedPreferences.getString("strAuthentication_Token", "");
        str_UserId = sharedPreferences.getString("strUserId", "");
        str_UserName = sharedPreferences.getString("strUserName", "");

        imgProfilePic = (ImageView) findViewById(R.id.img_ProfilePic);

        imgBtn_LogOut = (ImageView) findViewById(R.id.img_LogOut);
        listView_Filter = (ListView) findViewById(R.id.filter_List);
        txtUserName = (TextView) findViewById(R.id.txt_Username);

        txtUserName.setText(str_UserName);
        userAutoComplete_TextView = (AutoCompleteTextView) findViewById(R.id.autoComplete_UserList);

        db = dbhelper.getWritableDatabase();
        String query = "select * from Inspector";
        Cursor cursor = db.rawQuery(query, null);
        if (cursor.moveToFirst()) {
            do {
                Filter filter = new Filter();
                filter.setName(cursor.getString(cursor.getColumnIndex("Inspector_name")));
                String strActiveStatus = cursor.getString(cursor.getColumnIndex("ActiveStatus"));
                String strInspectorname = cursor.getString(cursor.getColumnIndex("Inspector_name"));

                if (strActiveStatus.equals("1")) {
                    userlist.add(strInspectorname);
                    Log.e("strInspectorname", " from Inspector = " + strInspectorname + "  & strActiveStatus  = " + strActiveStatus);
                }

            } while (cursor.moveToNext());
        }
        cursor.close();
        db.close();

        userAutoComplete_TextView.setAdapter(new ArrayAdapter<String>(this, android.R.layout.simple_list_item_1, userlist));
        userAutoComplete_TextView.setOnItemClickListener(new AdapterView.OnItemClickListener() {

            public void onItemClick(AdapterView<?> arg0, View arg1, int arg2, long arg3) {

                String foundItem = arg0.getItemAtPosition(arg2).toString();
                Log.e("You have selected --->", "" + foundItem);
                Filter filter = new Filter();
                filter.setName(foundItem);
                filter_ArrayList.add(filter);
                filterAdapter = new FilterAdapter(Filter_Screen.this, R.layout.filter_list_item, filter_ArrayList);
                listView_Filter.setAdapter(filterAdapter);
                db = dbhelper.getWritableDatabase();
                db.execSQL("UPDATE ALL_Post SET ActiveStatus ='1' WHERE inspectorName ='" + foundItem + "'");
                Log.e("Updated ListView --->", "" + foundItem);

            }
        });
}

先谢谢了。

Answer 1

尝试使用adapter.notifyDataSetChanged（）;在onResume的第一个Activity中。