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Android studio Exit button

 Java file......... import android.app.Activity; import android.app.AlertDialog; import android.content.Context; import android.content.DialogInterface; import android.os.Bundle; import android.view.View; import android.view.View.OnClickListener; import android.widget.Button; public class MainActivity extends Activity {     final Context context = this;     private Button button;     public void onCreate(Bundle savedInstanceState) {         super.onCreate(savedInstanceState);         setContentView(R.layout.activity_main);         button = (Button) findViewById(R.id.buttonAlert);         // add button listener         button.setOnClickListener(new OnClickListener() {                 @Override                 public void onClick(View arg0) {                     AlertDialog.Builder alertDialogBuilder = new AlertDialog.Builder(                         context);                     // set title                     alertDialogBuilder.setTitle("Your Title");

Android studio Round shape

  <?xml version="1.0" encoding="utf-8"?> <selector     xmlns:android="http://schemas.android.com/apk/res/android">     <item>         <shape android:shape="rectangle">             <stroke android:color="#FF2BE348"                 android:width="3dp"/>             <solid android:color="#FFC928DF"/>                 <corners android:radius="20dp"/>         </shape>     </item> </selector>

Android studio RelativeLayout

  <RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"     android:layout_width="fill_parent"     android:layout_height="fill_parent" >     <Button         android:id="@+id/btnButton1"         android:layout_width="wrap_content"         android:layout_height="wrap_content"         android:text="Button 1"/>     <Button         android:id="@+id/btnButton2"         android:layout_width="wrap_content"         android:layout_height="wrap_content"         android:text="Button 2"         android:layout_toRightOf="@+id/btnButton1"/>         <Button         android:id="@+id/btnButton13"         android:layout_width="wrap_content"         android:layout_height="wrap_content"         android:text="Button 13"         android:layout_toRightOf="@+id/btnButton2"/>