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

Intent i = new Intent(firstactivity.this, secondactivity.class);
startActivity(i);

Answer 2

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);  
      }

});

Answer 3

Take Button in xml first.

  <Button
        android:id="@+id/pre"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:background="@mipmap/ic_launcher"
        android:text="Your Text"
        />

Make listner of button.

 pre.setOnClickListener(new View.OnClickListener() {
        @Override
        public void onClick(View v) {
            Intent intent = new Intent(MainActivity.this, SecondActivity.class);
            startActivity(intent);
        }
    });

Answer 4

Easy.

Intent myIntent = new Intent(CurrentActivity.this, NextActivity.class);
myIntent.putExtra("key", value); //Optional parameters
CurrentActivity.this.startActivity(myIntent);

Extras are retrieved on the other side via:

@Override
protected void onCreate(Bundle savedInstanceState) {
    Intent intent = getIntent();
    String value = intent.getStringExtra("key"); //if it's a string you stored.
}

Don't forget to add your new activity in the AndroidManifest.xml:

<activity android:label="@string/app_name" android:name="NextActivity"/>

Answer 5

Although proper answers have been already provided but I am here for searching the answer in language Kotlin. This Question is not about language specific so I am adding the code to accomplish this task in Kotlin language.

Here is how you do this in Kotlin for andorid

testActivityBtn1.setOnClickListener{
      val intent = Intent(applicationContext,MainActivity::class.java)
      startActivity(intent)

 }

Answer 6

Place button widget in xml like below

<Button
    android:id="@+id/button"
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:text="Button"
/>

After that initialise and handle on click listener in Activity like below ..

In Activity On Create method :

Button button =(Button) findViewById(R.id.button); 
button.setOnClickListener(new View.OnClickListener() {
    @Override
    public void onClick(View view) {
       Intent intent = new 
            Intent(CurrentActivity.this,DesiredActivity.class);
            startActivity(intent);
    }
});