Question

I have a new problem. I am building an Android timer. In the main activity you can choose how long the timer will run. If you have chosen a value a timer activity should appear. My question is simple: How? I don’t know how the timer activity can know how long the timer should run. Can anyone tell me please?

Answer 1

In the intent you use to start the new activity, put an extra that indicates the amount of time with which the Timer should be set. Let’s say you’ve made an intent to start this timer activity called timeIntent and the amount of time you want the timer to be set for is in a variable called amountOfTime, they you’d do the following:

timerIntent.putExtra("time amount", amountOfTime);
startActivity(timerIntent);

One your in the timer activity, you can get this amount by calling getIntent() and getExtra() like so:

Intent myIntent = getIntent();
int timeAmount = 0;
if(myIntent!= null && myIntent.hasExtra("time amount"){
  timeAmount = myIntent.getIntExtra("time amount", 0);
}