diff --git a/app/src/main/cpp/MpPreview.cpp b/app/src/main/cpp/MpPreview.cpp
index 3bea742..7a88998 100644
--- a/app/src/main/cpp/MpPreview.cpp
+++ b/app/src/main/cpp/MpPreview.cpp
@@ -89,13 +89,13 @@ Java_com_xypower_camera2raw_Camera2RawFragment_makeHdr__JLjava_lang_String_2JLja
     times.push_back((float)(exposureTime1 / 1000) / 1000000.0);
     times.push_back((float)(exposureTime2 / 1000) / 1000000.0);
 
-    paths.push_back(jstring2string(path1));
-    paths.push_back(jstring2string(path2));
+    paths.push_back(jstring2string(env, path1));
+    paths.push_back(jstring2string(env, path2));
 
     cv::Mat rgb;
     if (makeHdr(times, paths, rgb))
     {
-        std::string fileName = jstring2string(outputPath);
+        std::string fileName = jstring2string(env, outputPath);
         if (cv::imwrite(fileName.c_str(), rgb))
         {
             return JNI_TRUE;
@@ -108,8 +108,29 @@ Java_com_xypower_camera2raw_Camera2RawFragment_makeHdr__JLjava_lang_String_2JLja
 extern "C"
 JNIEXPORT jboolean JNICALL
 Java_com_xypower_camera2raw_Camera2RawFragment_makeHdr__JLjava_lang_String_2JLjava_lang_String_2JLjava_lang_String_2Ljava_lang_String_2(
-        JNIEnv *env, jobject thiz, jlong exposure_time1, jstring path1, jlong exposure_time2,
-        jstring path2, jlong exposure_time3, jstring path3, jstring output_path) {
+        JNIEnv *env, jobject thiz, jlong exposureTime1, jstring path1, jlong exposureTime2,
+        jstring path2, jlong exposureTime3, jstring path3, jstring outputPath) {
+
+    std::vector<float> times;
+    std::vector<std::string> paths;
+
+    times.push_back((float)(exposureTime1 / 1000) / 1000000.0);
+    times.push_back((float)(exposureTime2 / 1000) / 1000000.0);
+    times.push_back((float)(exposureTime3 / 1000) / 1000000.0);
+
+    paths.push_back(jstring2string(env, path1));
+    paths.push_back(jstring2string(env, path2));
+    paths.push_back(jstring2string(env, path3));
+
+    cv::Mat rgb;
+    if (makeHdr(times, paths, rgb))
+    {
+        std::string fileName = jstring2string(env, outputPath);
+        if (cv::imwrite(fileName.c_str(), rgb))
+        {
+            return JNI_TRUE;
+        }
+    }
 
-    return JNI_TRUE;
+    return JNI_FALSE;
 }
\ No newline at end of file
diff --git a/settings.gradle b/settings.gradle
index ccfa6ae..6ed8445 100644
--- a/settings.gradle
+++ b/settings.gradle
@@ -12,5 +12,5 @@ dependencyResolutionManagement {
         mavenCentral()
     }
 }
-rootProject.name = "Camera2Raw"
+rootProject.name = "MpPreview"
 include ':app'