Button in Android

In this lesson, we would learn about Button in Android. Button is one of the basic widget which we normally use in each Android app. For example in last tutorial we learned about EditText and in example of EditText we added a button in Signup form. So same like that we can use button for different purpose in our Android App. We can use Button in Login form Button in Signup form. In this lesson we will learn how to add button widget in our XML Layout file and how to write working of that particular button in our Java file. Firstly we would start with our XML Layout file.

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Button Example
<?xml version="1.0" encoding="utf-8"?> <LinearLayout xmlns:android="http://schemas.android.com/apk/res/android" xmlns:app="http://schemas.android.com/apk/res-auto" xmlns:tools="http://schemas.android.com/tools" android:layout_width="match_parent" android:layout_height="match_parent" android:gravity="center" android:padding="16dp" android:orientation="vertical" tools:context=".ButtonExample"> <EditText android:layout_width="match_parent" android:layout_height="wrap_content" android:hint="Enter Your Name" android:inputType="text" android:id="@+id/editText" android:layout_marginBottom="10dp" /> <Button android:layout_width="250dp" android:layout_height="wrap_content" android:layout_marginBottom="10dp" android:textColor="@color/colorWhite" android:background="@color/colorPrimary" android:id="@+id/button" android:text="Create my Account"/> <TextView android:layout_width="wrap_content" android:layout_height="wrap_content" android:textSize="18sp" android:text="Text View" android:textColor="@color/colorPrimary" android:id="@+id/textView"/> </LinearLayout>


Output of This XML layout file will look like this..
Button widget in android


In this example you can see we added an EditText, a Button and a TextView and our purpose is to Enter a Name in EditText and to show that name in our TextView on click of our Button.



Button Example

public class ButtonExample extends AppCompatActivity {

    TextView textView;
    Button button;
    EditText editText;
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        textView=(TextView)findViewById(R.id.textView);
        button=(Button)findViewById(R.id.button);
        editText=(EditText)findViewById(R.id.editText);

        button.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                String name=editText.getText().toString();
                textView.setText("Hello "+name);
            }
        });
    }
}


Here the output of when will will press Button after Entering a name in EditText

Button in Android



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