Button handling in Android Studio.

In Android, Button is a user interface element where user click to perform some action, A button can be text or icon when user touches it it will perform some task. There are different types of button are available in android studio, like RadioButton, TonggelButton,CompondButton.

Here we discuss about onClick method, when ever  onClick method some task will be performed.Create a android project, here in Activity.xml take root layout as LinearLayout , orientation as  vertical.When ever user click on Button we will display a Toast message, for that take editText Below that a button, the code will lock like as shown in below.

Activity.xml

1. <?xml version="1.0" encoding="utf-8"?>
2. <LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
3. xmlns:app="http://schemas.android.com/apk/res-auto"
4. xmlns:tools="http://schemas.android.com/tools"
5. android:layout_width="match_parent"
6. android:orientation="vertical"
7. android:layout_height="match_parent"
8. tools:context="com.example.user.application1.MainActivity">
9. 
   
10.     <EditText
11. android:hint="enter message"
12. android:textSize="30dp"
13. android:id="@+id/edit"
14. android:layout_width="match_parent"
15. android:layout_height="wrap_content" />
16. 
    
17.     <Button
18. android:textSize="20dp"
19. android:textColor="#F00"
20. android:onClick="click"
21. android:id="@+id/button"
22. android:layout_marginTop="50dp"
23. android:layout_width="match_parent"
24. android:layout_height="wrap_content"
25. android:text="Button" />
26. </LinearLayout>

MainActivity.java

import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.view.View;
import android.widget.EditText;
import android.widget.Toast;
public class MainActivity extends AppCompatActivity {
    EditText edittext;
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        edittext = (EditText) findViewById(R.id.edit);
    }
    public void click(View view) {
        Toast.makeText(this, "message "+edittext.getText().toString(), Toast.LENGTH_SHORT).show();
    }
}

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