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

You can try this code:

Intent myIntent = new Intent();
FirstActivity.this.SecondActivity(myIntent);

Answer 2

The way to start new activities is to broadcast an intent, and there is a specific kind of intent that you can use to pass data from one activity to another. My recommendation is that you check out the Android developer docs related to intents; it's a wealth of info on the subject, and has examples too.

Answer 3

Implement the View.OnClickListener interface and override the onClick method.

ImageView btnSearch;

 @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_search1);
        ImageView btnSearch = (ImageView) findViewById(R.id.btnSearch);
        btnSearch.setOnClickListener(this);
    }

@Override
    public void onClick(View v) {
        switch (v.getId()) {
            case R.id.btnSearch: {
                Intent intent = new Intent(Search.this,SearchFeedActivity.class);
                startActivity(intent);
                break;
            }

Answer 4

Start another activity from this activity and u can pass parameters via Bundle Object also.

Intent intent = new Intent(getBaseContext(), YourActivity.class);
intent.putExtra("USER_NAME", "xyz@gmail.com");
startActivity(intent);

Retrive data in another activity (YourActivity)

String s = getIntent().getStringExtra("USER_NAME");

Answer 5

When user clicks on the button, directly inside the XML like that:

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

Using the attribute android:onClick we declare the method name that has to be present on the parent activity. So I have to create this method inside our activity like that:

public void buttonClickFunction(View v)
{
            Intent intent = new Intent(getApplicationContext(), Your_Next_Activity.class);
            startActivity(intent);
}

Answer 6

// In Kotlin , you can do as /* In First Activity, let in activity layout there is button which has id as button. Suppose I have to pass data as String type from one activity to another */

     val btn = findViewById<Button>(R.id.button)
     btn.setOnClickListener {
        val intent = Intent(baseContext, SecondActivity::class.java).apply {
             putExtra("KEY", data)
        }
        startActivity(intent)
     }

// In Second Activity, you can get data from another activity as

 val name = intent.getStringExtra("KEY")

/* Suppose you have to pass a Custom Object then it should be Parcelable. let there is class Collage type which I have to pass from one activity to another */

import android.os.Parcelable
import kotlinx.android.parcel.Parcelize

@Parcelize
class Collage(val name: String, val mobile: String, val email: String) : Parcelable

/* Activity First , let here data is Collage type. which I have to pass to another activity. */

val btn = findViewById<Button>(R.id.button)
         btn.setOnClickListener {
            val intent = Intent(baseContext, SecondActivity::class.java).apply {
                 putExtra("KEY", data)
            }
            startActivity(intent)
         }

// then from second Activity we will get as

val item = intent.extras?.getParcelable<Collage>("KEY")