Question

i am a new android Developer,
i wrote one thread class,and i call the thread class when i click a button from another class but throw null pointer exception ,the class call define public this is my code,
Class A;

done.setOnClickListener(new View.OnClickListener() 
{
@Override
public void onClick(View v) 
  {
    ClassB b=new ClassB();
    b.runalarm();
  }

Class B;

public void runalarm() 
{
SimpleThread my=new SimpleThread("myclass");
my.start();

}

class  SimpleThread extends Thread 
{
    private static final int None = 0;

    public SimpleThread(String str) 
    {
    super(str);
    }
    public void run() 
    {
        try
        {
               boolean loop=true;
               DatabaseHelper1 dbHelper1=new DatabaseHelper1(getApplicationContext());
}

please solve my problem in advance

Answer 1

Try doing something like this…

done.setOnClickListener(new View.OnClickListener() 
{
@Override
public void onClick(View v) 
  {
    ClassB b = new ClassB();

    ClassB.SimpleThread sx = b.new SimpleThread();

    sx.start();
  }