开发的qt android程序在低版本上运行正常，在高版本上启动时崩溃，报如下错误
W java.lang.RuntimeException: Can't create handler inside thread Thread[qtMainLoopThread,5,main] that has not called Looper.prepare()
at android.os.Handler.<init>(Handler.java:227)
at android.os.Handler.<init>(Handler.java:129)
at android.app.Activity.<init>(Activity.java:980)
at org.qtproject.qt.android.bindings.QtActivity.<init>(QtActivity.java:67)
at cn.pubwell.cons.ConsQtActivity.<init>(ConsQtActivity.java:58)
at org.qtproject.qt.android.QtNative.startQtApplication(Native Method)
at org.qtproject.qt.android.QtNative$7.run(QtNative.java:465)
at org.qtproject.qt.android.QtThread$1.run(QtThread.java:25)
at java.lang.Thread.run(Thread.java:1012)
A java_vm_ext.cc:591] JNI DETECTED ERROR IN APPLICATION: java_object == null
java_vm_ext.cc:591] in call to GetObjectClass
java_vm_ext.cc:591] from void org.qtproject.qt.android.QtNative.startQtApplication()
D Compat change id reported: 171228096; UID 10317; state: ENABLED
D Compat change id reported: 193247900; UID 10317; state: DISABLED
A runtime.cc:691] Runtime aborting...
runtime.cc:691] Dumping all threads without mutator lock held
runtime.cc:691] All threads:
runtime.cc:691] DALVIK THREADS (42):
runtime.cc:691] "main" prio=10 tid=1 Runnable
runtime.cc:691] | group="" sCount=0 ucsCount=0 flags=0 obj=0x71d226c0 self=0xb4000072732e8c00
runtime.cc:691] | sysTid=22682 nice=-10 cgrp=top-app sched=0/0 handle=0x72749274f8
runtime.cc:691] | state=R schedstat=( 613865508 70633029 567 ) utm=50 stm=11 core=6 HZ=100
runtime.cc:691] | stack=0x7fd5ccc000-0x7fd5cce000 stackSize=8188KB
runtime.cc:691] | held mutexes= "mutator lock"(shared held)
runtime.cc:691] native: #00 pc 0056f570 /apex/com.android.art/lib64/libart.so (art::DumpNativeStack+176) (BuildId: 43f5b252fbfc41f385c66b6a496e3d08)
runtime.cc:691] native: #01 pc 0068ffa8 /apex/com.android.art/lib64/libart.so (art::Thread::DumpStack const+344) (BuildId: 43f5b252fbfc41f385c66b6a496e3d08)
runtime.cc:691] native: #02 pc 006ae5a8 /apex/com.android.art/lib64/libart.so (art::DumpCheckpoint::Run+920) (BuildId: 43f5b252fbfc41f385c66b6a496e3d08)
runtime.cc:691] native: #03 pc 00690f0c /apex/com.android.art/lib64/libart.so (art::Thread::RunCheckpointFunction+188) (BuildId: 43f5b252fbfc41f385c66b6a496e3d08)
runtime.cc:691] native: #04 pc 002a4534 /apex/com.android.art/lib64/libart.so (art::Thread::CheckSuspend+64) (BuildId: 43f5b252fbfc41f385c66b6a496e3d08)
runtime.cc:691] native: #05 pc 00286b74 /apex/com.android.art/lib64/libart.so (art::ClassLinker::InitializeClass+1128) (BuildId: 43f5b252fbfc41f385c66b6a496e3d08)
runtime.cc:691] native: #06 pc 00266518 /apex/com.android.art/lib64/libart.so (art::ClassLinker::EnsureInitialized+164) (BuildId: 43f5b252fbfc41f385c66b6a496e3d08)
runtime.cc:691] native: #07 pc 00236018 /apex/com.android.art/lib64/libart.so (void art::interpreter::ExecuteSwitchImplCpp<false>+35964) (BuildId: 43f5b252fbfc41f385c66b6a496e3d08)
runtime.cc:691] native: #08 pc 00229bd8 /apex/com.android.art/lib64/libart.so (ExecuteSwitchImplAsm+8) (BuildId: 43f5b252fbfc41f385c66b6a496e3d08)
runtime.cc:691] native: #09 pc 0014dd26 /data/dalvik-cache/arm64/product@app@WebViewGoogle64@WebViewGoogle64.apk@classes.vdex (com.android.webview.chromium.WebViewChromiumFactoryProvider.addWebViewAssetPath)
runtime.cc:691] native: #10 pc 003db018 /apex/com.android.art/lib64/libart.so (art::interpreter::Execute +452) (BuildId: 43f5b252fbfc41f385c66b6a496e3d08)
runtime.cc:691] native: #11 pc 003e19b8 /apex/com.android.art/lib64/libart.so (art::interpreter::ArtInterpreterToInterpreterBridge+104) (BuildId: 43f5b252fbfc41f385c66b6a496e3d08)
runtime.cc:691] native: #12 pc 003e2538 /apex/com.android.art/lib64/libart.so (bool art::interpreter::DoCall<false>+1760) (BuildId: 43f5b252fbfc41f385c66b6a496e3d08)
runtime.cc:691] native: #13 pc 00230a58 /apex/com.android.art/lib64/libart.so (void art::interpreter::ExecuteSwitchImplCpp<false>+14012) (BuildId: 43f5b252fbfc41f385c66b6a496e3d08)
runtime.cc:691] native: #14 pc 00229bd8 /apex/com.android.art/lib64/libart.so (ExecuteSwitchImplAsm+8) (BuildId: 43f5b252fbfc41f385c66b6a496e3d08)
runtime.cc:691] native: #15 pc 00150408 /data/dalvik-cache/arm64/product@app@WebViewGoogle64@WebViewGoogle64.apk@classes.vdex (com.android.webview.chromium.WebViewChromium.<init>)
runtime.cc:691] native: #16 pc 003db018 /apex/com.android.art/lib64/libart.so (art::interpreter::Execute +452) (BuildId: 43f5b252fbfc41f385c66b6a496e3d08)
runtime.cc:691] native: #17 pc 003e19b8 /apex/com.android.art/lib64/libart.so (art::interpreter::ArtInterpreterToInterpreterBridge+104) (BuildId: 43f5b252fbfc41f385c66b6a496e3d08)
runtime.cc:691] native: #18 pc 003e2538 /apex/com.android.art/lib64/libart.so (bool art::interpreter::DoCall<false>+1760) (BuildId: 43f5b252fbfc41f385c66b6a496e3d08)
runtime.cc:691] native: #19 pc 00230a58 /apex/com.android.art/lib64/libart.so (void art::interpreter::ExecuteSwitchImplCpp<false>+14012) (BuildId: 43f5b252fbfc41f385c66b6a496e3d08)
网络上没有查找到有用信息，最终通过二分法找到了错误代码
...
QJniEnvironment env;
QJniObject javaClass("cn/pubwell/cons/ConsQtActivity"); // 使用findclass似乎也有同样的问题
jobject objAct = qObjAct.object<jobject>();
jclass objectClass = env->GetObjectClass( objAct );
...
env->RegisterNatives(objectClass,
methods,
sizeof(methods) / sizeof(methods[0]));
...
上面的注册方式有问题，应当使用如下方式
...
QJniEnvironment env;
jclass objectClass = env->GetObjectClass(javaClass.object<jobject>());
QJniObject qObjAct = QJniObject::callStaticObjectMethod(
"com/example/ExampleActivity",
"getContext",
"()Landroid/content/Context;");
if (!qObjAct.isValid())
{
return ;
}
jobject objAct = qObjAct.object<jobject>();
jclass objectClass = env->GetObjectClass( objAct );
env->RegisterNatives(objectClass,
methods,
sizeof(methods) / sizeof(methods[0]));
...
其中getContext为com/example/ExampleActivity.java的静态获取context函数