java - Playing sound via button crash (Android) -

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i have 3 buttons, when buttons tapped sound play. reason starting error now, after implemented 3 buttons. when did 1 button, played sound no error. after implemented 2 more, app started crash.
here code button in .xml 

 <button         android:layout_width="wrap_content"         android:layout_height="wrap_content"         android:text="play!"         android:id="@+id/play1"         android:layout_below="@+id/imageview"         android:layout_toleftof="@+id/play3"         android:layout_tostartof="@+id/play3" />

and here code in mainactivity.java 

//    final mediaplayer mp = mediaplayer.create(this, r.raw.sounds1); //    final mediaplayer mp2 = mediaplayer.create(this, r.raw.sounds2); //    final mediaplayer mp3 = mediaplayer.create(this, r.raw.sounds3);      @override     protected void oncreate(bundle savedinstancestate) {         super.oncreate(savedinstancestate);         setcontentview(r.layout.activity_main);  //        button play_button = (button)this.findviewbyid(r.id.play1); ////        button play_button2 = (button)this.findviewbyid(r.id.play2); ////        button play_button3 = (button)this.findviewbyid(r.id.play3); // //        play_button.setonclicklistener(new view.onclicklistener() { //            public void onclick(view v) { // // //                mp.start(); //            } //        }); // //        play_button2.setonclicklistener(new view.onclicklistener() { //            public void onclick(view v) { // // //                mp2.start(); //            } //        }); // //        play_button3.setonclicklistener(new view.onclicklistener() { //            public void onclick(view v) { // // //                mp3.start(); //            } //        });     }

here log too! 

  java.lang.runtimeexception: unable instantiate activity componentinfo{com.sounds.apps.sounds/com.sounds.apps.sounds.mainactivity}: java.lang.nullpointerexception: attempt invoke virtual method 'android.content.res.resources android.content.context.getresources()' on null object reference             @ android.app.activitythread.performlaunchactivity(activitythread.java:2209)             @ android.app.activitythread.handlelaunchactivity(activitythread.java:2360)             @ android.app.activitythread.access$800(activitythread.java:144)             @ android.app.activitythread$h.handlemessage(activitythread.java:1278)             @ android.os.handler.dispatchmessage(handler.java:102)             @ android.os.looper.loop(looper.java:135)             @ android.app.activitythread.main(activitythread.java:5221)             @ java.lang.reflect.method.invoke(native method)             @ java.lang.reflect.method.invoke(method.java:372)             @ com.android.internal.os.zygoteinit$methodandargscaller.run(zygoteinit.java:899)             @ com.android.internal.os.zygoteinit.main(zygoteinit.java:694)      caused by: java.lang.nullpointerexception: attempt invoke virtual method 'android.content.res.resources android.content.context.getresources()' on null object reference             @ android.content.contextwrapper.getresources(contextwrapper.java:85)             @ android.view.contextthemewrapper.getresources(contextthemewrapper.java:74)             @ android.media.mediaplayer.create(mediaplayer.java:919)             @ android.media.mediaplayer.create(mediaplayer.java:902)             @ com.sounds.apps.sounds.mainactivity.<init>(mainactivity.java:14)             @ java.lang.reflect.constructor.newinstance(native method)             @ java.lang.class.newinstance(class.java:1572)             @ android.app.instrumentation.newactivity(instrumentation.java:1065)             @ android.app.activitythread.performlaunchactivity(activitythread.java:2199)             at android.app.activitythread.handlelaunchactivity(activitythread.java:2360)             at android.app.activitythread.access$800(activitythread.java:144)             at android.app.activitythread$h.handlemessage(activitythread.java:1278)             at android.os.handler.dispatchmessage(handler.java:102)             at android.os.looper.loop(looper.java:135)             at android.app.activitythread.main(activitythread.java:5221)             at java.lang.reflect.method.invoke(native method)             at java.lang.reflect.method.invoke(method.java:372)             at com.android.internal.os.zygoteinit$methodandargscaller.run(zygoteinit.java:899)             at com.android.internal.os.zygoteinit.main(zygoteinit.java:694) 

       @override        protected void oncreate(bundle savedinstancestate) {        super.oncreate(savedinstancestate);         setcontentview(r.layout.activity_main);       final mediaplayer mp = mediaplayer.create(this, r.raw.sounds1);      final mediaplayer mp2 = mediaplayer.create(this, r.raw.sounds2);     final mediaplayer mp3 = mediaplayer.create(this, r.raw.sounds3);    button play_button = (button)this.findviewbyid(r.id.play1);     button play_button2 = (button)this.findviewbyid(r.id.play2);     button play_button3 = (button)this.findviewbyid(r.id.play3);      play_button.setonclicklistener(new view.onclicklistener() {         public void onclick(view v) {              mp.start();        }     });      play_button2.setonclicklistener(new view.onclicklistener() {         public void onclick(view v) {               mp2.start();         }    });      play_button3.setonclicklistener(new view.onclicklistener() {        public void onclick(view v) {               mp3.start();        }     }); }

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