Android Development - How to switch between two Activities

If you are new to Android App Development and understand how an Activity works, the next thing that will come to your mind is "How to switch from one Activity to another based on an action - such as button click?"

Let's see a code example of how you can do that!

Let's say you have created a second activity with the name MySecondActivity.java, to open this activity you would need to add the blow line of code on your method where the action is performed,

Intent indent = new Intent(getApplicationContext(), MySecondActivity.class);
startActivity(indent);

Now that you know how to call one activity from another using Indent, let's see how we can pass data just like we can do using an HTTP GET/Post request,

Intent indent = new Intent(getApplicationContext(), MySecondActivity.class);

indent.putExtra("key","value");
indent.putExtra("key1,"value1");

startActivity(indent);

Now that we know how to send data from one activity to other, let's see how the other activity can read that passed data!

Intent intent = getIntent();
String data = indent.getStringExtra("key");
String data1 = indent.getStringExtra("key1");
startActivity(indent);

Related post: https://code2care.org/q/pass-data-between-two-activities-intent