Android ขอสอบถามหน่อยครับโค็ดแจ้งเตือนแอนดรอย เมื่อผู้ใช้กรอกไม่ครบ เมื่อผู้ใช้กรอกเป็นตัวเลข

	public boolean SaveData()
	{
		// txtMemberID, txtName, txtTel
		final EditText tMemberID = (EditText) findViewById(R.id.txtMemberID);
		final EditText tName = (EditText) findViewById(R.id.txtName);
		final EditText tTel = (EditText) findViewById(R.id.txtTel);
				
		// Dialog
		final AlertDialog.Builder adb = new AlertDialog.Builder(this);
		AlertDialog ad = adb.create();
		
		// Check MemberID
		if(tMemberID.getText().length() == 0)
		{
            ad.setMessage("Please input [MemberID] ");
            ad.show();
            tMemberID.requestFocus();
            return false;
		}
		
		// Check Name
		if(tName.getText().length() == 0)
		{
            ad.setMessage("Please input [Name] ");
            ad.show();
            tName.requestFocus();
            return false;
		}	
		
		// Check Tel
		if(tTel.getText().length() == 0)
		{
            ad.setMessage("Please input [Tel] ");
            ad.show();
            tTel.requestFocus();
            return false;
		}		
		
		// new Class DB
		final myDBClass myDb = new myDBClass(this);
		
		// Check Data (MemberID exists)
		String arrData[] = myDb.SelectData(tMemberID.getText().toString());
    	if(arrData != null)
    	{
    		ad.setMessage("MemberID already exists!  ");
    		ad.show();
    		tMemberID.requestFocus();
   		 	return false; 
    	}
    		
    	// Save Data
    	long saveStatus = myDb.InsertData(tMemberID.getText().toString(),
    			tName.getText().toString(),
    			tTel.getText().toString());
    	if(saveStatus <=  0)
    	{
            ad.setMessage("Error!! ");
            ad.show();
            return false;
    	}
    	
		 Toast.makeText(AddActivity.this,"Add Data Successfully. ",
	 		     Toast.LENGTH_SHORT).show();   
		
		return true;
	}