java - My android app crashing only on Samsung devices. How can I solve it? -

i have app on play store(my first app). first version didn't crash. when released second version crashing on samsung devices. tested on no brand jelly bean device , on emulator , working perfectly. have no samsung devices. can now?

i think crashing on launcher activity. launcher activity main. splash screen. code , error provided below.

app name : rebel poet nazrul package name : com.xplosive.rebelpoetnazrul 

copied play store stack traces

java.lang.runtimeexception: unable start activity componentinfo{com.xplosive.rebelpoetnazrul/com.xplosive.rebelpoetnazrul.main}: java.lang.nullpointerexception @ android.app.activitythread.performlaunchactivity(activitythread.java:1970) @ android.app.activitythread.handlelaunchactivity(activitythread.java:1995) @ android.app.activitythread.access$600(activitythread.java:128) @ android.app.activitythread$h.handlemessage(activitythread.java:1161) @ android.os.handler.dispatchmessage(handler.java:99) @ android.os.looper.loop(looper.java:137) @ android.app.activitythread.main(activitythread.java:4517) @ java.lang.reflect.method.invokenative(native method) @ java.lang.reflect.method.invoke(method.java:511) @ com.android.internal.os.zygoteinit$methodandargscaller.run(zygoteinit.java:993) @ com.android.internal.os.zygoteinit.main(zygoteinit.java:760) @ dalvik.system.nativestart.main(native method) caused by: java.lang.nullpointerexception @ com.xplosive.rebelpoetnazrul.main.oncreate(main.java:56) @ android.app.activity.performcreate(activity.java:4470) @ android.app.instrumentation.callactivityoncreate(instrumentation.java:1053) @ android.app.activitythread.performlaunchactivity(activitythread.java:1934) ... 11 more 

main.java

package com.xplosive.rebelpoetnazrul;  import android.app.activity; import android.content.intent; import android.graphics.typeface; import android.media.mediaplayer; import android.os.bundle; import android.widget.textview; import androidbangladesh.bengali.support.bengaliunicodestring;  public class main extends activity {      mediaplayer mp;      textview tvbanner, tv1;     typeface font;      string banner, version, develop, developer;      @override     protected void oncreate(bundle savedinstancestate) {         super.oncreate(savedinstancestate);          // actionbar actionbar = getactionbar();         // actionbar.setdisplayhomeasupenabled(true);         // actionbar.setbackgrounddrawable(new colordrawable(color         // .parsecolor("#6699ff")));         // actionbar.setbackgrounddrawable(new colordrawable(color.green));          setcontentview(r.layout.activity_main);         settitle("বিদ্রোহী কবি নজরুল");          initialize();          banner = "বিদ্রোহী কবি নজরুল";         version = "ভার্সন ২.০";         develop = "developed by";         developer = "xplo";          int apiversion = android.os.build.version.sdk_int;          if (apiversion < 16) {             bengaliunicodestring.getbengaliutf(main.this, banner, tvbanner);             bengaliunicodestring.getbengaliutf(main.this, version, tv1);          } else {             tvbanner.settypeface(font);             tv1.settypeface(font);              tvbanner.settext(banner);             tv1.settext(version);          }          mp = mediaplayer.create(getapplicationcontext(), r.raw.startup);         //mp = mediaplayer.create(main.this, r.raw.startup);          mp.start();          thread timer = new thread() {             public void run() {                 try {                     sleep(2000);                 } catch (exception e) {                     e.printstacktrace();                  } {                      intent intent = new intent(main.this,                             mainmenuactivity.class);                      startactivity(intent);                 }             };         };          timer.start();      }      private void initialize() {         font = typeface.createfromasset(getassets(), "solaimanlipinormal.ttf");         tvbanner = (textview) findviewbyid(r.id.tvbanner);         tv1 = (textview) findviewbyid(r.id.textview1);      }      @override     protected void onpause() {          super.onpause();         mp.release();         // mp.stop(); //this not working         finish();      }  } 

activity_main.xml

<linearlayout xmlns:android="http://schemas.android.com/apk/res/android"     xmlns:tools="http://schemas.android.com/tools"     android:layout_width="match_parent"     android:layout_height="match_parent"     android:background="#66ccff"     android:gravity="center"     android:orientation="vertical"     tools:context=".mainactivity" >      <textview         android:id="@+id/tvbanner"         android:layout_width="wrap_content"         android:layout_height="wrap_content"         android:gravity="center"         android:text="বিদ্রোহী কবি নজরুল"         android:textcolor="@color/banner"         android:textsize="35sp" />      <textview         android:id="@+id/textview1"         android:layout_width="wrap_content"         android:layout_height="wrap_content"         android:text="ভার্সন ২.০"         android:textcolor="@color/banner"         android:textsize="15sp" />      <space         android:layout_width="match_parent"         android:layout_height="40dp" />      <textview         android:id="@+id/textview2"         android:layout_width="wrap_content"         android:layout_height="wrap_content"         android:text="developed by"         android:textcolor="@color/banner"         android:textsize="20sp" />      <textview         android:id="@+id/textview3"         android:layout_width="wrap_content"         android:layout_height="wrap_content"         android:text="xplo"         android:textcolor="@color/banner"         android:textsize="30sp" />  </linearlayout> 

crash device list

galaxy s duos (kyleopen) galaxy grand duos (baffin) galaxy tab3 8.0 (lt013g) galaxy core (arubaslim) nuclear-t03 galaxy note3 (hlte) galaxy s3 mini (golden)