Android jni JNI_OnLoad error -

apiaccess.h

#include <jni.h> #ifndef apiaccess_h #define apiaccess_h void init_data(jnienv* env); void toast(char* msg); #endif 

hello-jni.c

#include <string.h> #include <jni.h> #include "apiaccess.h"  jstring javastr( jnienv* env, jobject        thiz ); void connectfunc(jnienv* env){     jninativemethod methods[] =  {{ "stringfromjni", "()ljava/lang/string;", (void*)javastr}};   jclass clazz = (*env)->findclass(env, "com/testndk/ndk/hellojni");     int status = ((*env)->registernatives(env, clazz, methods, 1)); } jint jni_onload(javavm *vm, void *reserved){     // jni env function calls     jnienv* env = null;     if ((*vm)->getenv(vm, (void**)&env, jni_version_1_6) != jni_ok) return -1;     connectfunc(env);     init_data(env);     toast("toast in jni_onload"); //error     //return jni version need.   default valur jni 1.1     return jni_version_1_6; }  jstring javastr( jnienv* env, jobject thiz ){        toast("toast in javastr");//no error      return (*env)->newstringutf(env,   "hello jni !");  } 

apiaccess.c

#include <jni.h>  jnienv* env = 0; void init_data(jnienv* parenv){     env = parenv; } void toast(char* msg){     static jclass clazz = 0;     if(clazz==0)  clazz = (*env)->findclass(env, "com/testndk/ndk/hellojni");     static jmethodid method = 0;     if(method==0)  method = (*env)->getstaticmethodid(env, clazz, "toast", "(ljava/lang/string;)v");     (*env)->callstaticvoidmethod(env,clazz,method,(*env)->newstringutf(env, msg));  } 

hellojni.java

package com.testndk.ndk;  import android.app.*; import android.content.*; import android.os.*; import android.widget.*; import android.util.*;  public class hellojni extends activity{ private static context ctx; @override  public void oncreate(bundle savedinstancestate)  {  super.oncreate(savedinstancestate);    hellojni.ctx = getapplicationcontext();         textview  tv = new textview(this);         tv.settext(stringfromjni());         setcontentview(tv);     }     public static void toast(string msg){         toast.maketext(hellojni.ctx, msg,     toast.length_short).show();     }     public native string stringfromjni();      static {         system.loadlibrary("hello-jni");     } } 

calling toast in javastr works fine. in jni_onload, crashes application. why can't call toast in jni_onload()? provided code related error. logcat output:

i/timeline( 1558): timeline:    activity_launch_request    id:com.testndk.ndk time:14821530 v/applicationpolicy(  999):     isapplicationstateblocked userid 0    pkgname com.testndk.ndk d/resourcesmanager(  999): creating new assetmanager , set /data/app/com.testndk.ndk-1/base.apk i/activitymanager(  999): start u0 {act=android.intent.action.main cat=[android.intent.category.launcher] flg=0x10200000 cmp=com.testndk.ndk/.hellojni} uid 10008 on display 0 i/activitymanager(  999): start proc com.testndk.ndk activity com.testndk.ndk/.hellojni: pid=28993 uid=10281 gids={50281, 9997} abi=armeabi i/surfaceflinger(  246): id=6131 createsurf (1080x1920),2 flag=404, starting com.testndk.ndk d/resourcesmanager(28993): creating new assetmanager , set /data/app/com.testndk.ndk-1/base.apk e/androidruntime(28993): process: com.testndk.ndk, pid: 28993 e/androidruntime(28993):    @   com.testndk.ndk.hellojni.toast(hellojni.java:25) e/androidruntime(28993):    @ com.testndk.ndk.hellojni.<clinit>(hellojni.java:30) v/applicationpolicy(  999): isapplicationstateblocked userid 0 pkgname com.testndk.ndk w/activitymanager(  999):   force finishing activity com.testndk.ndk/.hellojni d/crashanrdetector(  999): processname: com.testndk.ndk d/crashanrdetector(  999): broadcastevent : com.testndk.ndk data_app_crash i/surfaceflinger(  246): id=6132 createsurf (49x49),1 flag=4, application error: com.testndk.ndk w/activitymanager(  999): activity pause timeout   activityrecord{3a27a7c6 u0 com.testndk.ndk/.hellojni t1692 f} i/surfaceflinger(  246): id=6131 removed starting com.testndk.ndk (6/10) i/surfaceflinger(  246): id=6131 removed starting com.testndk.ndk (-2/10) i/activitymanager(  999): process com.testndk.ndk (pid 28993)(adj 9) has died(65,325) i/surfaceflinger(  246): id=6132 removed application error: com.testndk.ndk (7/9) i/surfaceflinger(  246): id=6132 removed application error: com.testndk.ndk (-2/9) d/networkstatsfactory(  999): updatestatsforknox 

edit see problem is. problem jni_onload call on system.loadlibrary , static block call when class loads. ctx not initialized , caused nullpointerexception not realized static block runs earlier constructor