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JNI is wanky. Finally about to return an object from C++ to Java/Kotlin

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This commit is contained in:
kdeng00
2019-10-05 17:30:37 -04:00
parent d3bcbd28ef
commit 33ac4c6fcf
86 changed files with 761 additions and 226 deletions
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app/src/main/cpp/Demo.cpp
+67
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@@ -20,12 +20,33 @@
#include "model/Song.h"
#include "model/User.h"
#include "SongRepository.h"
#include "Tok.h"
model::Song retrieveSong(const std::string&);
std::string fetchToken(const std::string&, const std::string&, const std::string&);
model::Song retrieveSong(const std::string& token)
{
repository::SongRepository songRepo;
model::Song song;
song.id = 2;
song.title = "Smooth";
song.album = "Amaze";
song.artist = "The Herb";
song.genre = "Blazing";
song.duration = 420;
song.year = 420;
song = songRepo.retrieveSong(token, song.id);
return song;
}
std::string fetchToken(const std::string& username, const std::string& password,
const std::string& apiUri)
{
@@ -57,3 +78,49 @@ Java_com_example_mear_activities_DemoStreamActivity_logUser(
return env->NewStringUTF(token.c_str());
}
extern "C"
JNIEXPORT jobject
JNICALL
Java_com_example_mear_activities_DemoStreamActivity_retrieveSong(
JNIEnv *env,
jobject thisObj,
jstring token
)
{
const std::string tok = env->GetStringUTFChars(token, NULL);
auto song = retrieveSong(tok);
std::string bank = "SBI Bank";
jclass songClass = env->FindClass( "com/example/mear/models/Song");
jmethodID jconstructor = env->GetMethodID( songClass, "<init>", "()V" );
jobject songObj = env->NewObject( songClass, jconstructor );
jmethodID songId = env->GetMethodID( songClass, "setId", "(I)V" );
jmethodID songTitle = env->GetMethodID( songClass, "setTitle", "(Ljava/lang/String;)V" );
jmethodID songAlbum = env->GetMethodID( songClass, "setAlbum", "(Ljava/lang/String;)V" );
jmethodID songArtist = env->GetMethodID( songClass, "setArtist", "(Ljava/lang/String;)V" );
jmethodID songGenre = env->GetMethodID( songClass, "setGenre", "(Ljava/lang/String;)V" );
jmethodID songDuration = env->GetMethodID( songClass, "setDuration", "(I)V" );
jmethodID songYear = env->GetMethodID( songClass, "setYear", "(I)V" );
jint id = song.id;
jstring title = env->NewStringUTF(song.title.c_str());
jstring album = env->NewStringUTF(song.album.c_str());
jstring artist = env->NewStringUTF(song.artist.c_str());
jstring genre = env->NewStringUTF(song.genre.c_str());
jint duration = song.duration;
jint year = song.year;
env->CallVoidMethod( songObj, songId, id );
env->CallVoidMethod(songObj, songTitle, title);
env->CallVoidMethod(songObj, songAlbum, album);
env->CallVoidMethod(songObj, songArtist, artist);
env->CallVoidMethod(songObj, songGenre, genre);
env->CallVoidMethod(songObj, songDuration, duration);
env->CallVoidMethod(songObj, songYear, year);
return songObj;
}