How to start new activity on button click

Question

In an Android application, how do you start a new activity (GUI) when a button in another activity is clicked, and how do you pass data between these two activities?

Answer 1

Starting an activity from another activity is very common scenario among android applications.
To start an activity you need an Intent object.

How to create Intent Objects?

An intent object takes two parameter in its constructor

1. Context
2. Name of the activity to be started. (or full package name)

Example:

So for example,if you have two activities, say HomeActivity and DetailActivity and you want to start DetailActivity from HomeActivity (HomeActivity-->DetailActivity).

Here is the code snippet which shows how to start DetailActivity from

HomeActivity.

Intent i = new Intent(HomeActivity.this,DetailActivity.class);
startActivity(i);

And you are done.

Coming back to button click part.

Button button = (Button) findViewById(R.id.someid);

button.setOnClickListener(new View.OnClickListener() {
     
     @Override
     public void onClick(View view) {
         Intent i = new Intent(HomeActivity.this,DetailActivity.class);
         startActivity(i);  
      }

});