Android在AutocompleteTextview中选择特定列值，并使用sqlite db显示位置？

如何从“条件”列中获取特定值并获取纬度和经度

我的SQLITE数据库列包括：

    //Table Columns names
private static final String KEY_TID = "id";
public static final String KEY_TreeID = "treeid";
public static final String KEY_TCONDITION = "condition";
public static final String KEY_TLATITUDE = "latitude";
public static final String KEY_TLONGITUDE = "longitude";


 private static final String CREATE_TABLE = "CREATE TABLE if not exists " + TABLE_TREE + "("
        + KEY_TID + " INTEGER PRIMARY KEY AUTOINCREMENT, "
        + KEY_TreeID + " , "
        + KEY_TCONDITION + " , "
        + KEY_TLATITUDE + " double, "
        + KEY_TLONGITUDE + " double "
        +");";


ID  Condition   Latitude    Longitude
1   Excellent   12.897485   15.425974
2   Good        12.897485   15.425974
3   Excellent   12.897485   15.425974
4   Poor        12.897485   15.425974
5   Poor        12.897485   15.425974
6   Excellent   12.897485   15.425974
7   Fair        12.897485   15.425974
8   Good        12.897485   15.425974
9   Good        12.897485   15.425974
10  Excellent   12.897485   15.425974

我的地图活动： 我使用了一个AutoCompleteTextView来表示我的“条件”=“优秀”、“良好”、“较差”和“一般”。点击一个按钮可以显示带有标记的谷歌地图

 inputSearch = (AutoCompleteTextView) findViewById(R.id.et_search);
    ArrayAdapter adapter1 = new ArrayAdapter(this, android.R.layout.select_dialog_item, conditions);
    inputSearch.setThreshold(1);
    inputSearch.setAdapter(adapter1);
    btMap = (Button) findViewById(R.id.MapButton);

若我的AutoCompleteTextView为空并单击按钮，它将显示我的所有10个位置，如sqlite db表所示

“这工作正常”

否则，如果我从AutoCompleteTextview中选择“优秀”并单击按钮，它应该只显示“优秀”行纬度和经度，即ID 1、3、6和10

“这不起作用”

为了读取我的数据库，我使用了以下代码：

  //Getting all the 10 Location information in MapsActivity
public Cursor getLocations(){
    db = SQLiteHandler.getWritableDatabase();
    String[] selecteditems = {SQLiteHandler.KEY_TLATITUDE,SQLiteHandler.KEY_TLONGITUDE, SQLiteHandler.KEY_TCONDITION,SQLiteHandler.KEY_TreeID};
    Cursor cursor = db.query(SQLiteHandler.TABLE_TREE,selecteditems,null,null,null,null,null);
    return cursor;
}

    //Get only selected row in AutoCompleteTextView information in MapsActivity
public Cursor getSelectedLocations(String search){
    db = SQLiteHandler.getWritableDatabase();
    String[] selecteditems = {SQLiteHandler.KEY_TLATITUDE,SQLiteHandler.KEY_TLONGITUDE, SQLiteHandler.KEY_TCONDITION,SQLiteHandler.KEY_TreeID};
    String where = SQLiteHandler.KEY_TCONDITION + "=?";
    String[] whereArgs = new String[]{search+""};
    Cursor cursor = db.query(SQLiteHandler.TABLE_TREE,selecteditems,where,whereArgs,null,null,null,null);
    return cursor;
}

错误

致命异常：主 进程：com.example.bharat.plantnow，PID:2124 java.lang.NullPointerException 在com.example.bharat.plantnow.MapsActivity$1.onClick（MapsActivity.java:132）上 在android.view.view.performClick上（view.java:4438） 在android.view.view$PerformClick.run（view.java:18422） 位于android.os.Handler.handleCallback（Handler.java:733） 位于android.os.Handler.dispatchMessage（Handler.java:95） 位于android.os.Looper.loop（Looper.java:136） 位于android.app.ActivityThread.main（ActivityThread.java:5017） 位于java.lang.reflect.Method.Invokenactive（本机方法） 位于java.lang.reflect.Method.invoke（Method.java:515） 在com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run（ZygoteInit.java:779）上 位于com.android.internal.os.ZygoteInit.main（ZygoteInit.java:595）

---

在dalvik.system.NativeStart.main（本机方法）

在Toast中获得

一切都很好

？是。在If语句之后。但它在Else语句首先执行时显示错误。

if(search.length() > 0){


                Cursor c = db.getSelectedLocations(search);

                c.moveToFirst();

                do {
                   double latitude1 = c.getDouble(c
                            .getColumnIndex(SQLiteHandler.KEY_TLATITUDE));
                    double longitude1 = c.getDouble(c
                            .getColumnIndex(SQLiteHandler.KEY_TLONGITUDE));

                    String marker = c.getString(c
                            .getColumnIndex(SQLiteHandler.KEY_TreeID));

                    LatLng location = new LatLng(latitude1, longitude1);

                    mMap.addMarker(new MarkerOptions().position(location).title(marker));


                } while (c.moveToNext());
                Toast.makeText(getApplicationContext(), "All is Well", Toast.LENGTH_LONG).show();
        }
            else{
                Toast.makeText(getApplicationContext(), "Invalid", Toast.LENGTH_LONG).show();
            }
    }
});}

  //Getting all the 10 Location information in MapsActivity
public Cursor getLocations(){
    db = SQLiteHandler.getWritableDatabase();
    String[] selecteditems = {SQLiteHandler.KEY_TLATITUDE,SQLiteHandler.KEY_TLONGITUDE, SQLiteHandler.KEY_TCONDITION,SQLiteHandler.KEY_TreeID};
    Cursor cursor = db.query(SQLiteHandler.TABLE_TREE,selecteditems,null,null,null,null,null);
    return cursor;
}

    //Get only selected row in AutoCompleteTextView information in MapsActivity
public Cursor getSelectedLocations(String search){
    db = SQLiteHandler.getWritableDatabase();
    String[] selecteditems = {SQLiteHandler.KEY_TLATITUDE,SQLiteHandler.KEY_TLONGITUDE, SQLiteHandler.KEY_TCONDITION,SQLiteHandler.KEY_TreeID};
    String where = SQLiteHandler.KEY_TCONDITION + "=?";
    String[] whereArgs = new String[]{search+""};
    Cursor cursor = db.query(SQLiteHandler.TABLE_TREE,selecteditems,where,whereArgs,null,null,null,null);
    return cursor;
}