Remove unused FML JNI helpers (flutter/engine#3547)

engine/src/flutter/fml/platform/android/jni_util.cc

@@ -13,7 +13,6 @@ namespace fml {
 namespace jni {
 
 static JavaVM* g_jvm = nullptr;
-static ScopedJavaGlobalRef<jobject>* g_android_application_context = nullptr;
 
 #define ASSERT_NO_EXCEPTION() FTL_CHECK(env->ExceptionCheck() == JNI_FALSE);
 
@@ -37,20 +36,6 @@ void DetachFromVM() {
   }
 }
 
-void InitAndroidApplicationContext(const JavaRef<jobject>& context) {
-  FTL_DCHECK(g_android_application_context == nullptr);
-  g_android_application_context = new ScopedJavaGlobalRef<jobject>(context);
-  FTL_DCHECK(g_android_application_context->obj() != nullptr);
-}
-
-const jobject GetAndroidApplicationContext() {
-  jobject object = g_android_application_context->obj();
-  FTL_DCHECK(object != nullptr)
-      << "Trying to get Android application context without first calling "
-         "InitAndroidApplicationContext.";
-  return object;
-}
-
 static std::string UTF16StringToUTF8String(const char16_t* chars, size_t len) {
   std::u16string u16_string(chars, len);
   return std::wstring_convert<std::codecvt_utf8_utf16<char16_t>, char16_t>{}
@@ -138,47 +123,5 @@ bool ClearException(JNIEnv* env) {
   return true;
 }
 
-std::string GetJavaExceptionInfo(JNIEnv* env, jthrowable java_throwable) {
-  ScopedJavaLocalRef<jclass> throwable_clazz(
-      env, env->FindClass("java/lang/Throwable"));
-
-  jmethodID throwable_printstacktrace = env->GetMethodID(
-      throwable_clazz.obj(), "printStackTrace", "(Ljava/io/PrintStream;)V");
-
-  // Create an instance of ByteArrayOutputStream.
-  ScopedJavaLocalRef<jclass> bytearray_output_stream_clazz(
-      env, env->FindClass("java/io/ByteArrayOutputStream"));
-
-  jmethodID bytearray_output_stream_constructor =
-      env->GetMethodID(bytearray_output_stream_clazz.obj(), "<init>", "()V");
-  jmethodID bytearray_output_stream_tostring = env->GetMethodID(
-      bytearray_output_stream_clazz.obj(), "toString", "()Ljava/lang/String;");
-  ScopedJavaLocalRef<jobject> bytearray_output_stream(
-      env, env->NewObject(bytearray_output_stream_clazz.obj(),
-                          bytearray_output_stream_constructor));
-
-  // Create an instance of PrintStream.
-  ScopedJavaLocalRef<jclass> printstream_clazz(
-      env, env->FindClass("java/io/PrintStream"));
-
-  jmethodID printstream_constructor = env->GetMethodID(
-      printstream_clazz.obj(), "<init>", "(Ljava/io/OutputStream;)V");
-  ScopedJavaLocalRef<jobject> printstream(
-      env, env->NewObject(printstream_clazz.obj(), printstream_constructor,
-                          bytearray_output_stream.obj()));
-
-  // Call Throwable.printStackTrace(PrintStream)
-  env->CallVoidMethod(java_throwable, throwable_printstacktrace,
-                      printstream.obj());
-
-  // Call ByteArrayOutputStream.toString()
-  ScopedJavaLocalRef<jstring> exception_string(
-      env,
-      static_cast<jstring>(env->CallObjectMethod(
-          bytearray_output_stream.obj(), bytearray_output_stream_tostring)));
-
-  return JavaStringToString(env, exception_string.obj());
-}
-
 }  // namespace jni
 }  // namespace fml

engine/src/flutter/fml/platform/android/jni_util.h

@@ -21,10 +21,6 @@ JNIEnv* AttachCurrentThread();
 
 void DetachFromVM();
 
-void InitAndroidApplicationContext(const JavaRef<jobject>& context);
-
-const jobject GetAndroidApplicationContext();
-
 std::string JavaStringToString(JNIEnv* env, jstring string);
 
 ScopedJavaLocalRef<jstring> StringToJavaString(JNIEnv* env,
@@ -40,8 +36,6 @@ bool HasException(JNIEnv* env);
 
 bool ClearException(JNIEnv* env);
 
-std::string GetJavaExceptionInfo(JNIEnv* env, jthrowable java_throwable);
-
 }  // namespace jni
 }  // namespace fml