android: use cmake build system

android/build.gradle

     androidTestImplementation 'org.hamcrest:hamcrest-all:1.3'
 }
 
+android {
+    compileSdk 33
+    ndkVersion "25.1.8937393"
+    namespace "com.reecedunn.espeak"
+
+    defaultConfig {
+        minSdk 19
+        targetSdk 33
+        versionCode 22
+        versionName "1.52-dev"
+
+        externalNativeBuild {
+            cmake {
+                arguments "-DUSE_ASYNC:BOOL=OFF", "-DUSE_MBROLA:BOOL=OFF"
+                targets "ttsespeak", "espeak-data"
+            }
+        }
+    }
+
+    externalNativeBuild {
+        cmake {
+            path "jni/CMakeLists.txt"
+            version "3.22.1"
+        }
+    }
+
+    sourceSets {
+        main {
+            manifest.srcFile 'AndroidManifest.xml'
+            java.srcDirs = ['src']
+            res.srcDirs = ['res']
+        }
+        androidTest.setRoot('eSpeakTests')
+        androidTest {
+            java.srcDirs = ['eSpeakTests/src']
+        }
+    }
+
+    lint {
+        abortOnError false
+    }
+}
+
 tasks.register('checkData') {
     doFirst {
         assert file("../espeak-ng-data/en_dict").exists()
 }
 
 tasks.register('createDataArchive', Zip) {
-    dependsOn tasks.checkData
     preserveFileTimestamps = false
     reproducibleFileOrder = true
     archiveFileName = "espeakdata.zip"
     destinationDirectory = file("res/raw")
 
-    from("../espeak-ng-data/") {
+    from("build/generated/espeak-ng-data/") {
         into "espeak-ng-data"
     }
 }
     rename { return 'espeakdata_version' }
     into file("./res/raw")
 }
-preBuild.dependsOn createDataVersion
-
-
-android {
-    compileSdk 33
-    ndkVersion "25.1.8937393"
-    namespace "com.reecedunn.espeak"
-
-    defaultConfig {
-        minSdk 19
-        targetSdk 30
-        versionCode 22
-        versionName "1.52-dev"
-    }
-
-    externalNativeBuild {
-        ndkBuild {
-            path "jni/Android.mk"
-        }
-    }
-
-    sourceSets {
-        main {
-            manifest.srcFile 'AndroidManifest.xml'
-            java.srcDirs = ['src']
-            res.srcDirs = ['res']
-        }
-        androidTest.setRoot('eSpeakTests')
-        androidTest {
-            java.srcDirs = ['eSpeakTests/src']
-        }
-    }
 
-    lint {
+project.afterEvaluate {
-        abortOnError false
+    tasks.checkData.dependsOn(externalNativeBuildDebug)
-    }
+    tasks.createDataArchive.dependsOn(externalNativeBuildDebug)
+    javaPreCompileDebug.dependsOn(tasks.createDataVersion)
+    javaPreCompileRelease.dependsOn(tasks.createDataVersion)
 }

android/jni/Android.mk

-LOCAL_PATH:= $(call my-dir)
-include $(CLEAR_VARS)
-
-#LOCAL_CFLAGS = -std=c11 # speechplayer is c++ code
-
-# ucd-tools wide-character compatibility support:
-
-UCDTOOLS_SRC_PATH  := ../../src/ucd-tools/src
-UCDTOOLS_SRC_FILES := \
-  $(subst $(LOCAL_PATH)/$(UCDTOOLS_SRC_PATH),$(UCDTOOLS_SRC_PATH),$(wildcard $(LOCAL_PATH)/$(UCDTOOLS_SRC_PATH)/*.c*))
-
-LOCAL_SRC_FILES += $(UCDTOOLS_SRC_FILES)
-
-SPEECHPLAYER_SRC_FILES := \
-  ../../src/speechPlayer/src/frame.cpp \
-  ../../src/speechPlayer/src/speechPlayer.cpp \
-  ../../src/speechPlayer/src/speechWaveGenerator.cpp
-
-LOCAL_SRC_FILES += $(SPEECHPLAYER_SRC_FILES)
-
-ESPEAK_SOURCES := \
-  src/libespeak-ng/common.c \
-  src/libespeak-ng/compiledata.c \
-  src/libespeak-ng/compiledict.c \
-  src/libespeak-ng/compilembrola.c \
-  src/libespeak-ng/dictionary.c \
-  src/libespeak-ng/encoding.c \
-  src/libespeak-ng/error.c \
-  src/libespeak-ng/espeak_api.c \
-  src/libespeak-ng/ieee80.c \
-  src/libespeak-ng/intonation.c \
-  src/libespeak-ng/klatt.c \
-  src/libespeak-ng/langopts.c \
-  src/libespeak-ng/mnemonics.c \
-  src/libespeak-ng/numbers.c \
-  src/libespeak-ng/phoneme.c \
-  src/libespeak-ng/phonemelist.c \
-  src/libespeak-ng/readclause.c \
-  src/libespeak-ng/setlengths.c \
-  src/libespeak-ng/soundicon.c \
-  src/libespeak-ng/spect.c \
-  src/libespeak-ng/speech.c \
-  src/libespeak-ng/sPlayer.c \
-  src/libespeak-ng/ssml.c \
-  src/libespeak-ng/synthdata.c \
-  src/libespeak-ng/synthesize.c \
-  src/libespeak-ng/synth_mbrola.c \
-  src/libespeak-ng/translate.c \
-  src/libespeak-ng/translateword.c \
-  src/libespeak-ng/tr_languages.c \
-  src/libespeak-ng/voices.c \
-  src/libespeak-ng/wavegen.c
-
-ESPEAK_SRC_PATH  := ../../src
-ESPEAK_SRC_FILES := \
-  $(subst src/,$(ESPEAK_SRC_PATH)/,$(ESPEAK_SOURCES))
-
-LOCAL_CFLAGS    += -DINCLUDE_KLATT -DINCLUDE_SPEECHPLAYER -DINCLUDE_SONIC -DHAVE_ENDIAN_H
-LOCAL_SRC_FILES += \
-  $(filter-out $(BLACKLIST_SRC_FILES),$(ESPEAK_SRC_FILES))
-
-# JNI
-
-LOCAL_SRC_FILES += \
-  $(subst $(LOCAL_PATH)/jni,jni,$(wildcard $(LOCAL_PATH)/jni/*.c))
-
-# Common
-
-LOCAL_C_INCLUDES += \
-  $(LOCAL_PATH)/include \
-  $(LOCAL_PATH)/$(UCDTOOLS_SRC_PATH)/include \
-  $(LOCAL_PATH)/../../src/speechPlayer/include \
-  $(LOCAL_PATH)/$(ESPEAK_SRC_PATH)/include \
-  $(LOCAL_PATH)/$(ESPEAK_SRC_PATH)/include/compat
-
-LOCAL_LDLIBS := \
-  -llog
-
-LOCAL_MODULE := libttsespeak
-LOCAL_MODULE_TAGS := optional
-LOCAL_PRELINK_MODULE := false
-
-include $(BUILD_SHARED_LIBRARY)

android/jni/CMakeLists.txt

+cmake_minimum_required(VERSION 3.8)
+
+project(espeak-android)
+
+add_subdirectory(../../ espeakng)
+
+add_custom_target(
+        espeak-data
+        COMMAND ${CMAKE_COMMAND} -B${CMAKE_CURRENT_BINARY_DIR}/../espeak-data ${CMAKE_CURRENT_SOURCE_DIR}/../../
+        COMMAND ${CMAKE_COMMAND} --build ${CMAKE_CURRENT_BINARY_DIR}/../espeak-data --target data
+        COMMAND ${CMAKE_COMMAND} -E copy_directory ${CMAKE_CURRENT_BINARY_DIR}/../espeak-data/espeak-ng-data ${CMAKE_SOURCE_DIR}/../build/generated/espeak-ng-data
+)
+
+message(STATUS "Data: ${CMAKE_CURRENT_SOURCE_DIR}")
+
+find_library(A_LOG log)
+
+add_library(ttsespeak SHARED
+        jni/eSpeakService.c
+        )
+target_include_directories(ttsespeak PRIVATE
+        include
+)
+target_link_libraries(ttsespeak PRIVATE
+        espeak-ng ${A_LOG}
+)

android/jni/jni/eSpeakService.c

 #include <unistd.h>
 #include <stdlib.h>
 #include <stdbool.h>
+#include <string.h>
 #include <jni.h>
 
 #include <espeak/speak_lib.h>