Question

Actually i have created an singleton class. Now my singleton class extends Activity, and i have write onCreate() and onStart() method on this class. But it is never called.The code i have used is shown below. If anyone knows help me to solve these out.

Code

public class cycleManager
{
private static CycleManager m_cycleManagerObj;

private CycleManager()
{           
    // Initialise Variable
    onInitialization();

    readData(this); // show error when call from here
}   

public static synchronized CycleManager getSingletonObject() 
{           
    if (m_cycleManagerObj == null)
    {
        m_cycleManagerObj = new CycleManager();
    }               
    return m_cycleManagerObj;
}

public Object clone() throws CloneNotSupportedException
{           
    throw new CloneNotSupportedException(); 
}

public void writeData(Context c) 
{
    SharedPreferences preferencesWrite  = c.getSharedPreferences("myPreferences", 0);
    SharedPreferences.Editor editor  = preferencesWrite.edit();
    // work to be done
}
public void readData(Context c)
{
    SharedPreferences preferencesRead = c.getSharedPreferences("myPreferences", 0);
    // work to be done
}
}

Answer 1

The thing is Android manages activities in its own manner: from calling a constructor to calling all lifecycle methods. So if you declare your Activity’s constructor as private then Android will not be able to manage this activity.

Why do you need singleton Activity-class? Consider different launch modes