對話框不打開android

嘿那裏工作與我通過點擊一個按鈕調用活動的應用程序。報告。課堂活動必須在其按鈕點擊事件中打開對話框。但不幸的是它不顯示對話框。對話框不打開android

下面是代碼：

public class Report extends Activity{ 

    int t_id; 
    int list1=2,list2=3; 
    Button btn_day,btn_category,btn_partner,btn_finish; 
    Context context=this; 

    SQLiteDatabase db; 
     SimpleCursorAdapter cursor; 
     sqliteHelper helper = new sqliteHelper(this); 
     Cursor c; 

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


      setContentView(R.layout.report); 


     Intent i = getIntent(); 

     t_id=i.getIntExtra("t_id",0); 

     btn_day=(Button)findViewById(R.id.btn_day); 
     btn_category=(Button)findViewById(R.id.btn_exp); 
     btn_partner=(Button)findViewById(R.id.btn_partner); 

     btn_day.setOnClickListener(new OnClickListener(){ 

      @Override 
      public void onClick(View arg0) { 
       // TODO Auto-generated method stub 
       db = helper.getReadableDatabase(); 
       c=db.rawQuery("Select date,SUM(ammount) from tbl_expense where c_trip_id=? GROUP BY date",new String[] {Integer.toString(t_id)}); 
       System.out.println("total columns"+c.getColumnCount()); 
       if(c.getCount()!=0) 
       { 
        fetch(); 


       } 
      } 

     }); 


      }); 
     btn_partner.setOnClickListener(new OnClickListener(){ 

      @Override 
      public void onClick(View arg0) { 

       db = helper.getReadableDatabase(); 
       final String MY_QUERY = "SELECT a.user_name, SUM(b.ammount) FROM tbl_usermain a INNER JOIN tbl_expense b ON a.user_id=b.c_u_id WHERE b.c_trip_id=? GROUP BY a.user_name "; 

       c=db.rawQuery(MY_QUERY, new String[]{Integer.toString(t_id)}); 
       //c=db.rawQuery("Select date,SUM(ammount) from tbl_expense where c_trip_id=? GROUP BY date",new String[] {Integer.toString(t_id)}); 
       System.out.println("total columns"+c.getColumnCount()); 
       if(c.getCount()!=0) 

        fetch(); 


      } 

      }); 

    } 

    private void fetch() { 
     // TODO Auto-generated method stub 
     final Dialog dialog = new Dialog(Report.this); 
     dialog.setContentView(R.layout.reportlist); 
     LinearLayout reportlistview=(LinearLayout)dialog.findViewById(R.id.reportlayout); 
     dialog.setTitle("Report"); 
     dialog.show(); 
     ArrayList<HashMap> expense_by_user = new ArrayList<HashMap>(); 
     c.moveToFirst(); 

     for(int j=1;j<=c.getCount();j++) 
     { 
      HashMap temp = new HashMap(); 
       temp.put(FIRST_COLUMN,j); 
       temp.put(SECOND_COLUMN, c.getString(0)); 
       temp.put(THIRD_COLUMN, c.getInt(1)); 

      expense_by_user.add(temp); 
      c.moveToNext(); 
     } 


     c.close(); 
     db.close(); 

      /*SET THE ADAPTER TO LISTVIEW*/ 


      ListView list=new ListView(Report.this); 
      list.setId(list2); 
      listviewAdapter adapter = new listviewAdapter(Report.this, expense_by_user); 
      list.setAdapter(adapter); 

      reportlistview.addView(list); 


    } 
    @Override 
    protected void onSaveInstanceState(Bundle outState) {  
     int viewId = this.getCurrentFocus().getId(); 
     outState.putInt("hasFocus", viewId); 

     super.onSaveInstanceState(outState); 
    } 

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

     int viewId = savedInstanceState.getInt("hasFocus"); 
     View view = findViewById(viewId); 
     view.requestFocus();   
    } 

}

logcat的觀點：

01-06 12:03:48.603: INFO/ActivityManager(61): Starting: Intent { cmp=com.NRP.MainPackage/.Report (has extras) } from pid 918 
01-06 12:03:49.873: INFO/ActivityManager(61): Displayed com.NRP.MainPackage/.Report: +1s160ms 
01-06 12:03:50.154: DEBUG/dalvikvm(61): GC_CONCURRENT freed 968K, 46% free 4369K/8071K, external 2269K/3469K, paused 24ms+13ms 
01-06 12:03:52.294: INFO/System.out(918): total columns2 
01-06 12:04:05.676: INFO/System.out(918): total columns2 
01-06 12:05:17.223: VERBOSE/BackupManagerService(61): Backup requested but nothing pending 
01-06 12:06:02.463: DEBUG/SntpClient(61): request time failed: java.net.SocketException: Address family not supported by protocol

與解決它：

c.moveToFirst(); 
      if(c.getColumnCount()!=0) 

       fetch(); 


     }

來源

2014-01-06 user2869524

請發佈logcat錯誤。 –

確保在點擊按鈕時調用fatch（）。 –

其**取**，而不是* fatch * :) –

你是不是能顯示的對話，因爲你得到c.getCount（）= 0，這就是爲什麼在條件不滿足和fe的情況下從不調用tch（）方法，檢查c.getCount（）的值，你的對話框代碼是正確的。

if(c.getCount()!=0) 

        fetch(); 


      }

來源

2014-01-06 06:42:16

在if條件中使用c.getColumnCount（）而不是c.getCount（），希望它適用於你 –

我已更新我的代碼 – user2869524

你的對話框代碼很好。檢查您的光標值

c.getCount（）= 0是問題。

來源

2014-01-06 07:31:06 iFunDroid

對話框不打開android

回答

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