[Android] Fix Android JNI Crash (#2827)

* [Android] Fix Android JNI Crash

`jni_object()` in `ReportException()` could be nullptr if `InitFramework()` is not invoked.

```
JNI DETECTED ERROR IN APPLICATION: obj == null
 in call to CallVoidMethodV
from int com.taobao.weex.bridge.WXBridge.nativeCreateInstanceContext(java.lang.String, java.lang.String, java.lang.String, com.taobao.weex.bridge.WXJSObject[])
......

(_JNIEnv::CallVoidMethod(_jobject*, _jmethodID*, ...)+22)
(WeexCore::WXBridge::ReportException(_JNIEnv*, char const*, char const*, char const*)+132)
 (WeexCore::AndroidSide::ReportException(char const*, char const*, char const*)+34)
......

(WeexCore::CoreSideInPlatform::CreateInstance(char const*, char const*, char const*, int, char const*, char const*, char const*, std::__ndk1::vector<InitFrameworkParams*, std::__ndk1::allocator<InitFrameworkParams*>>&, char const*)+820)
at com.taobao.weex.bridge.WXBridge.nativeCreateInstanceContext(Native method)
at com.taobao.weex.bridge.WXBridge.createInstanceContext(Taobao:233)
at com.taobao.weex.bridge.WXBridgeManager.invokeCreateInstanceContext(Taobao:1981)
at com.taobao.weex.bridge.WXBridgeManager.invokeCreateInstance(Taobao:1709)
```

* Fix crash in EagleBridge::WeexCoreHandler::PostTaskToMsgLoop

message_loop() in PostTaskToMsgLoop() could be nullptr if InitFramework() is not invoked.

* Avoid multiple initialization.

* Revert changes of InitSciptThread

* Post successCallback in RequestHandler to JSThread.

* Revert "Post successCallback in RequestHandler to JSThread."

This reverts commit 04bc406

* Delete `;`

weex_core/Source/android/wrap/wx_bridge.cpp

@@ -39,7 +39,6 @@
 #include "base/android/jni_type.h"
 #include "base/android/jni/jbytearray_ref.h"
 #include "base/android/jniprebuild/jniheader/WXBridge_jni.h"
-#include "base/log_defines.h"
 #include "core/config/core_environment.h"
 #include "core/layout/layout.h"
 #include "core/layout/measure_func_adapter_impl_android.h"
@@ -305,7 +304,9 @@ static void SetDeviceDisplay(JNIEnv* env, jobject jcaller, jstring instanceId,
 
 static jint InitFramework(JNIEnv* env, jobject object, jstring script,
                           jobject params) {
-  WXBridge::Instance()->Reset(env, object);
+  if (!WXBridge::Instance()->jni_object()) {
+    WXBridge::Instance()->Reset(env, object);
+  }
   // Init platform thread --- ScriptThread
   WeexCoreManager::Instance()->InitScriptThread();
   // Exception handler for so
@@ -620,6 +621,9 @@ static jint CreateInstanceContext(JNIEnv* env, jobject jcaller,
 
   // If strategy is DATA_RENDER_BINARY, jscript is a jbyteArray, otherwise jstring
   // TODO use better way
+  if (!WXBridge::Instance()->jni_object()) {
+    WXBridge::Instance()->Reset(env, jcaller);
+  }
   if (scoped_render_strategy.getChars() != nullptr
       && strcmp(scoped_render_strategy.getChars(), "DATA_RENDER_BINARY") == 0) {
     JByteArrayRef byte_array(env, static_cast<jbyteArray>(jscript.Get()));