在Android中经过预设时间后如何开始活动？

Question

I have been trying with starting an activity after a pre determined time set by the user. I have two activities, one is sending some strings to another activity by means of:

Intent go = new Intent(MainActivity.this, CallComeActivity.class);

            go.putExtra("sub", name);
            go.putExtra("photo_path", fname);
            go.putExtra("text", number);

            startActivity(go);

I am receiving these strings using:

    String sub = intent.getStringExtra("sub");
    String photo_path=intent.getStringExtra("photo_path");
    String text = intent.getStringExtra("text");

Now I need to start this second activity after some time. I have tried with BroadCast Receiver but I am not able to send these strings to the second class using Broadcast Receiver. I am only able to trigger the second class without passing these strings. Please Help.

Answer 1

What you need is AlarmManager.. , and you can use PendingIntent for putting extras

Intent go = new Intent(MainActivity.this, CallComeActivity.class);

            go.putExtra("sub", name);
            go.putExtra("photo_path", fname);
            go.putExtra("text", number);
PendingIntent pIntent = PendingIntent.getActivity(this, 0, go, 0);

From the documentation:

This class provides access to the system alarm services. These allow you to schedule your application to be run at some point in the future. When an alarm goes off, the Intent that had been registered for it is broadcast by the system, automatically starting the target application if it is not already running. Registered alarms are retained while the device is asleep (and can optionally wake the device up if they go off during that time), but will be cleared if it is turned off and rebooted.

Answer 2

Are you trying to do something like this

new Handler().postDelayed(new Runnable() {

                @Override
                public void run() {
                    // This method will be executed once the timer is over
                    // Start your app main activity
                    callIntent();
                }
            }, Your_pre_determined_time);

Answer 3

You can schedule an Alarm using AlarmManager and once you get a call to onReceive method of your AlarmReceiver, you can start the activity. But it might look abrupt especially if the user is using some other application.

Intent intent = new Intent(appContext, AlarmReceiver.class);
                    intent.putExtra(key, value);
                    PendingIntent alarmIntent = PendingIntent.getBroadcast(appContext,id, intent, 0);
alarmMgr.setExact(AlarmManager.RTC, remindAtTimeStamp, alarmIntent);

Answer 4

TimerTask task = new TimerTask() {
    @Override
    public void run() {
        Intent go = new Intent(MainActivity.this, CallComeActivity.class);

        go.putExtra("sub", name);
        go.putExtra("photo_path", fname);
        go.putExtra("text", number);

        startActivity(go);
    }
};

Timer timer = new Timer();
timer.schedule(task, 3000);

Try using TimerTask for execute something after a certain time. I use this for show a splash screen for mi app for tree seconds.