Question

Hi I have a timer task that check a file every 1 minute

public class MyTimerTask extends TimerTask {
//java.io.File file = new java.io.File("/mnt/sdcard/Bluetooth/1.txt");
java.io.File file = new java.io.File("init.rc");
public void CheckTheFile() 
{
if (file.exists())
    {   
    // I want here to start the Activity GetGPS
    }
}
@Override
public void run() {
    CheckTheFile();
}

}

in the check of file.exists , I want if the file is there , activity called GetGPS.
Thanks.

Answer 1

In your case I would recommend using Handler class. Here’s what I would do:

private static class PromoScroller implements Runnable {

    private Handler _scrollHandler;

    public PromoScroller(Handler scrollHandler) {
        _scrollHandler = scrollHandler;
    }

    @Override
    public void run() {
        // .. 
        _scrollHandler.sendEmptyMessage(0);
    }
}

// somewhere in your activity:

_promoScroller = new PromoScroller(new Handler() {
        @Override
        public void dispatchMessage(Message msg) {
            super.dispatchMessage(msg);
            // !! catch message and start the activity
            Intent = new Intent(YourCurrentActivty.this, YourTargetActivity.class);
        }
    });
    _scrollerThread = new Thread(_promoScroller);
    _scrollerThread.start();

P.S. those are bits of code I use for scrolling timer, but you get the idea

UPD

// TASK
public class YourTimerTask extends TimerTask {
    private Handler _Handler;

    public YourTimerTask(Handler handler) {
        _Handler = handler;
    }

    public void run() {
        _Handler.sendEmptyMessage(0);
    }
}

// TASK HANDLER (private property in your acitivity)
private Handler _taskHandler = new Handler(){
    public void dispatchMessage(android.os.Message msg) {
        // do cleanup, close db cursors, file handler, etc.
        // start your target activity
        Intent viewTargetActivity = new Intent(YourCurrentActivity.this, YourTargetActivity.class);

    };
};


// IN YOUR ACTIVITY (for isntance, in onResume method)
Timer timer = new Timer();
timer.schedule(new YourTimerTask(_taskHandler), seconds*1000);

This should do the job. For timer – just google.timer example

UPD2

my mistake – it should be Handler _timerHandler = .... for starting activity look here