Android load new activity

In Android, you can load a new activity using the Intent class. Here are the general steps:

1. Create a new Intent object:

   Intent intent = new Intent(this, NewActivity.class);

   Replace this with the current activity, and NewActivity.class with the name of the new activity you want to load.

2. Set any necessary data or flags on the Intent object:

   intent.putExtra("key", "value");
   intent.setFlags(Intent.FLAG_ACTIVITY_NEW_TASK);

   You can add extra data to the Intent using the putExtra() method, and set flags using the setFlags() method.

3. Start the new activity using the startActivity() method:

   startActivity(intent);

   This will load the new activity and display it on top of the current activity.

Here's a complete example:

public class MainActivity extends AppCompatActivity {
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);

        // Create a new Intent
        Intent intent = new Intent(this, NewActivity.class);

        // Set some extra data
        intent.putExtra("name", "John");

        // Start the new activity
        startActivity(intent);
    }
}

In this example, when the user clicks a button or performs some other action, the MainActivity will create a new Intent object and start the NewActivity using the startActivity() method.

You can also use the startActivityForResult() method to start a new activity and receive a result back from it. This is useful when you need to perform some operation in the new activity and then return the result to the original activity.

For example:

public class MainActivity extends AppCompatActivity {
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);

        // Create a new Intent
        Intent intent = new Intent(this, NewActivity.class);

        // Start the new activity and request a result
        startActivityForResult(intent, REQUEST_CODE);
    }

    @Override
    protected void onActivityResult(int requestCode, int resultCode, Intent data) {
        super.onActivityResult(requestCode, resultCode, data);

        if (requestCode == REQUEST_CODE && resultCode == RESULT_OK) {
            // Handle the result
            String result = data.getStringExtra("result");
            Toast.makeText(this, result, Toast.LENGTH_SHORT).show();
        }
    }
}

In this example, the MainActivity starts the NewActivity using the startActivityForResult() method and requests a result with the requestCode value of REQUEST_CODE. The NewActivity can then return a result using the setResult() method, and the MainActivity can receive the result in the onActivityResult() method.