Closing Application with Exit button [duplicate]

Question

I'm a beginner in android, I'm practicing a Project that have a 2 labels and 1 exit button. But when I run this project in android phone the exit button is not working, it won't exit at all.

How can I make exit button work?

Answer 1

Below used main.xml file

 <?xml version="1.0" encoding="utf-8"?>  <LinearLayout xmlns:android="http://schemas.android.com/apk/res/android" android:orientation="vertical" android:layout_width="fill_parent" android:layout_height="fill_parent"> <TextView android:layout_width="fill_parent"     android:layout_height="wrap_content" android:id="@+id/txt1" android:text="txt1" /> <TextView android:layout_width="fill_parent"     android:layout_height="wrap_content" android:id="@+id/txt2"   android:text="txt2"/> <Button android:layout_width="fill_parent"     android:layout_height="wrap_content" android:id="@+id/btn1"     android:text="Close App" />   </LinearLayout> 

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and text.java file is below

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import android.app.Activity;  import android.os.Bundle;  import android.view.View;  import android.view.View.OnClickListener;  import android.widget.Button;  public class testprj extends Activity { /** Called when the activity is first created. */ @Override public void onCreate(Bundle savedInstanceState) {     super.onCreate(savedInstanceState);     setContentView(R.layout.main);      Button btn1 = (Button) findViewById(R.id.btn1);     btn1.setOnClickListener(new OnClickListener() {          @Override         public void onClick(View v) {             // TODO Auto-generated method stub             finish();             System.exit(0);         }     });     }  } 

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Answer 2

Don't ever put an Exit button on an Android app. Let the OS decide when to kill your Activity. Learn about the Android Activity lifecycle and implement any necessary callbacks.