Невозможно перенести строковое значение из одного класса в другой ⇐ Android

[Anonymous]

Я пытаюсь отправить строку, обращенную к спиннеру, к классу «Помощник данных», чтобы запустить запрос и вставить значение в другом спиннере, который работает на другом действии.

Код: Выделить всё

@Override
public void onItemSelected(AdapterView arg0, View arg1, int arg2, long arg3) {
// On selecting a spinner item
label = spinnerComp.getSelectedItem().toString(); //storing value of spinner in string label
System.out.println("NewTask label="+label);
toRetDeptString();   //it will call return string method
// Showing selected spinner item
Toast.makeText(spinnerComp.getContext(), "You selected: " + label, Toast.LENGTH_LONG).show();
}
< /code>
Метод обратной строки также объявлен в Newtask.java:
public String toRetDeptString() {
System.out.println("NewTask String label="+label);
return label;
}

Я пытаюсь получить доступ к значению строки метки DataHelper , который запускает запрос на основе значения в строковой метке.

Код: Выделить всё

public List getAllLabelsDept(){
NewTask a = new NewTask();
String n1= a.toRetDeptString();  //this one doesn't worked
// String n1 = a.label;  //this one doesn't worked
// String n1="umbrella";  //this method worked by directly assiging string value
System.out.println("a="+n1);
List labels = new ArrayList();

//  Query
String selectQuery = "select  " + Dept + " from "+TABLE_NAME +" where " + Comp + " = '" + n1 +"'";
SQLiteDatabase db1 = this.getReadableDatabase();
Cursor cursor = db1.rawQuery(selectQuery, null);

// looping through all rows and adding to list
if (cursor.moveToFirst()) {
do {
labels.add(cursor.getString(cursor.getColumnIndex(Dept)));
} while (cursor.moveToNext());
}

// closing connection
cursor.close();
db1.close();

// returning labels
return labels;
}
< /code>
select_dept.java:
public class Select_Dept extends Activity implements OnItemSelectedListener{
Spinner spinnerDept;

@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_select__dept);
spinnerDept = (Spinner) findViewById(R.id.spinnerDept);
spinnerDept.setOnItemSelectedListener(this);
loadSpinnerDataDept();
}

private void loadSpinnerDataDept() {
// database handler
DatabaseHelper db = new DatabaseHelper(getApplicationContext());
// Spinner Drop down elements
List lables = db.getAllLabelsDept();
// Creating adapter for spinner
ArrayAdapter dataAdapter = new ArrayAdapter(this, android.R.layout.simple_spinner_item, lables);
// Drop down layout style - list view with radio button
dataAdapter.setDropDownViewResource(android.R.layout.simple_spinner_dropdown_item);
// attaching data adapter to spinner
spinnerDept.setAdapter(dataAdapter);
}

@Override
public void onItemSelected(AdapterView arg0, View arg1, int arg2, long arg3) {
// On selecting a spinner item
String label = spinnerDept.getSelectedItem().toString();
// Showing selected spinner item
Toast.makeText(spinnerDept.getContext(), "You selected: " + label, Toast.LENGTH_LONG).show();
}

@Override
public boolean onCreateOptionsMenu(Menu menu) {
// Inflate the menu; this adds items to the action bar if it is present.
getMenuInflater().inflate(R.menu.select__dept, menu);
return true;
}

@Override
public void onNothingSelected(AdapterView  arg0) {
// TODO Auto-generated method stub
}
}
< /code>
logcat: < /p>
- 06-05 12:30:13.369: I/ActivityManager(59): Starting activity: Intent { act=android.intent.action.MAIN cat=[android.intent.category.LAUNCHER] flg=0x10200000 cmp=com.EzyCloud.ezytask/.MainActivity }
- 06-05 12:30:14.160: I/ActivityManager(59): Displayed activity com.EzyCloud.ezytask/.MainActivity: 562 ms (total 562 ms)
- 06-05 12:30:16.139: I/ActivityManager(59): Starting activity: Intent { cmp=com.EzyCloud.ezytask/.NewTask }
- 06-05 12:30:16.299: I/System.out(280): NewTask label=umbrella
- 06-05 12:30:16.299: I/System.out(280): NewTask String label=umbrella
- 06-05 12:30:16.559: I/ActivityManager(59): Displayed activity com.EzyCloud.ezytask/.NewTask: 406 ms (total 406 ms)
- 06-05 12:30:19.140: I/ActivityManager(59): Starting activity: Intent { cmp=com.EzyCloud.ezytask/.Select_Dept }
- 06-05 12:30:19.339: I/System.out(280): NewTask String label= //no value accesed
- 06-05 12:30:19.339: I/System.out(280): a=                     **//no value accesed**
- 06-05 12:30:19.699: I/ActivityManager(59): Displayed activity  - com.EzyCloud.ezytask/.Select_Dept: 508 ms (total 508 ms)
- 06-05 12:30:24.849: D/dalvikvm(128): GC_EXPLICIT freed 202 objects / 9800 bytes in 145ms

Но строка не доступна.

Подробнее здесь: https://stackoverflow.com/questions/240 ... to-another