package com.demo.nativate;

import androidx.appcompat.app.AppCompatActivity;

import android.os.Bundle;

import android.widget.TextView;

import com.demo.nativate.databinding.ActivityMainBinding;

public class MainActivity extends AppCompatActivity {

    // Used to load the 'nativate' library on application startup.

    static {

        System.loadLibrary("nativate");

    }

    private ActivityMainBinding binding;

//    @Override

    protected native void onCreate(Bundle savedInstanceState);

//    {

//        super.onCreate(savedInstanceState);

//        setContentView(R.layout.activity_main);

//        // Example of a call to a native method

//        TextView tv = findViewById(R.id.sample_text);

//        tv.setText(stringFromJNI());

//    }

    /**

     * A native method that is implemented by the 'nativate' native library,

     * which is packaged with this application.

     */

    public native String stringFromJNI();

}

#include <jni.h>

#include <string>

#include <android/log.h>

#define LOGD(...) __android_log_print(ANDROID_LOG_DEBUG, "Tag->", __VA_ARGS__)

extern "C" JNIEXPORT jstring JNICALL

Java_com_demo_nativate_MainActivity_stringFromJNI(

        JNIEnv *env,

        jobject /* this */) {

    std::string hello = "Hello from C++";

    return env->NewStringUTF(hello.c_str());

}

extern "C"

JNIEXPORT void JNICALL

Java_com_demo_nativate_MainActivity_onCreate(JNIEnv *env, jobject thiz,

                                             jobject saved_instance_state) {

    // TODO: implement onCreate()

    LOGD("静态注册  MainActivity  OnCreate be called！");

    //super.onCreate(savedInstanceState);

    jclass MainActivityClass = env->GetObjectClass(thiz);

    jclass AppCompatActivityClass = env->GetSuperclass(MainActivityClass);

    jmethodID onCreate = env->GetMethodID(AppCompatActivityClass, "onCreate",

                                          "(Landroid/os/Bundle;)V");

    env->CallNonvirtualVoidMethod(thiz, AppCompatActivityClass, onCreate,

                                  saved_instance_state); //调用父类方法

    LOGD("静态注册  super.onCreate(savedInstanceState) be called！");

//    setContentView(R.layout.activity_main);

    jmethodID setContentView_id = env->GetMethodID(MainActivityClass, "setContentView", "(I)V");

    jclass layoutClass = env->FindClass("com/demo/nativate/R$layout");

    jfieldID activity_main_id = env->GetStaticFieldID(layoutClass, "activity_main", "I");

    jint id_txt_main = env->GetStaticIntField(layoutClass, activity_main_id);

    env->CallVoidMethod(thiz, setContentView_id, id_txt_main);

    LOGD("静态注册  setContentView(R.layout.activity_main); be called！");

//    TextView tv = findViewById(R.id.sample_textFId);

    jmethodID findViewById_mid = env->GetMethodID(MainActivityClass, "findViewById",

                                                  "(I)Landroid/view/View;");

    jclass RIdClass = env->FindClass("com/demo/nativate/R$id");

    jfieldID sample_textFId = env->GetStaticFieldID(RIdClass, "sample_text", "I");

    jint sample_textF = env->GetStaticIntField(RIdClass, sample_textFId);

    LOGD("静态注册  TextView tv = findViewById(R.id.sample_textFId); be called！");

    jobject tvobject = env->CallObjectMethod(thiz, findViewById_mid, sample_textF);

//    tv.setText(stringFromJNI());

    jclass tvClass = env->GetObjectClass(tvobject);

    jmethodID setText_mid = env->GetMethodID(tvClass, "setText", "(Ljava/lang/CharSequence;)V");

    jstring text = env->NewStringUTF("onCreate-->Native success by c++ !!!");

    env->CallVoidMethod(tvClass, setText_mid, text);

    env->DeleteLocalRef(text);

    LOGD("静态注册  tv.setText(stringFromJNI());; be called！");

}

#include <jni.h>

#include <string>

#include <android/log.h>

#define LOGD(...) __android_log_print(ANDROID_LOG_DEBUG, "Tag->", __VA_ARGS__)

extern "C" JNIEXPORT jstring JNICALL

Java_com_demo_nativate_MainActivity_stringFromJNI(

        JNIEnv *env,

        jobject /* this */) {

    std::string hello = "Hello from C++";

    return env->NewStringUTF(hello.c_str());

}

extern "C"

JNIEXPORT void JNICALL

Java_com_demo_nativate_MainActivity_onCreate(JNIEnv *env, jobject thiz,

                                             jobject saved_instance_state) {

    // TODO: implement onCreate()

    LOGD("静态注册  MainActivity  OnCreate be called！");

    //super.onCreate(savedInstanceState);

    jclass MainActivityClass = env->GetObjectClass(thiz);

    jclass AppCompatActivityClass = env->GetSuperclass(MainActivityClass);

    jmethodID onCreate = env->GetMethodID(AppCompatActivityClass, "onCreate",

                                          "(Landroid/os/Bundle;)V");

    env->CallNonvirtualVoidMethod(thiz, AppCompatActivityClass, onCreate,

                                  saved_instance_state); //调用父类方法

    LOGD("静态注册  super.onCreate(savedInstanceState) be called！");

//    setContentView(R.layout.activity_main);

    jmethodID setContentView_id = env->GetMethodID(MainActivityClass, "setContentView", "(I)V");

    jclass layoutClass = env->FindClass("com/demo/nativate/R$layout");

    jfieldID activity_main_id = env->GetStaticFieldID(layoutClass, "activity_main", "I");

    jint id_txt_main = env->GetStaticIntField(layoutClass, activity_main_id);

    env->CallVoidMethod(thiz, setContentView_id, id_txt_main);

    LOGD("静态注册  setContentView(R.layout.activity_main); be called！");

//    TextView tv = findViewById(R.id.sample_textFId);

    jmethodID findViewById_mid = env->GetMethodID(MainActivityClass, "findViewById",

                                                  "(I)Landroid/view/View;");

    jclass RIdClass = env->FindClass("com/demo/nativate/R$id");

    jfieldID sample_textFId = env->GetStaticFieldID(RIdClass, "sample_text", "I");

    jint sample_textF = env->GetStaticIntField(RIdClass, sample_textFId);

    LOGD("静态注册  TextView tv = findViewById(R.id.sample_textFId); be called！");

    jobject tvobject = env->CallObjectMethod(thiz, findViewById_mid, sample_textF);

//    tv.setText(stringFromJNI());

    jclass tvClass = env->GetObjectClass(tvobject);

    jmethodID setText_mid = env->GetMethodID(tvClass, "setText", "(Ljava/lang/CharSequence;)V");

    jstring text = env->NewStringUTF("onCreate-->Native success by c++ !!!");

    env->CallVoidMethod(tvClass, setText_mid, text);

    env->DeleteLocalRef(text);

    LOGD("静态注册  tv.setText(stringFromJNI());; be called！");

}

void dynamicRegister(JNIEnv *env, jobject thiz, jobject saved_instance_state) {

    LOGD("动态注册  MainActivity  OnCreate be called！");

    //super.onCreate(savedInstanceState);

    jclass MainActivityClass = env->GetObjectClass(thiz);

    jclass AppCompatActivityClass = env->GetSuperclass(MainActivityClass);

    jmethodID onCreate = env->GetMethodID(AppCompatActivityClass, "onCreate",

                                          "(Landroid/os/Bundle;)V");

    env->CallNonvirtualVoidMethod(thiz, AppCompatActivityClass, onCreate,

                                  saved_instance_state); //调用父类方法

    LOGD("动态注册  super.onCreate(savedInstanceState) be called！");

//    setContentView(R.layout.activity_main);

    jmethodID setContentView_id = env->GetMethodID(MainActivityClass, "setContentView", "(I)V");

    jclass layoutClass = env->FindClass("com/demo/nativate/R$layout");

    jfieldID activity_main_id = env->GetStaticFieldID(layoutClass, "activity_main", "I");

    jint id_txt_main = env->GetStaticIntField(layoutClass, activity_main_id);

    env->CallVoidMethod(thiz, setContentView_id, id_txt_main);

    LOGD("动态注册  setContentView(R.layout.activity_main); be called！");

//    TextView tv = findViewById(R.id.sample_textFId);

    jmethodID findViewById_mid = env->GetMethodID(MainActivityClass, "findViewById",

                                                  "(I)Landroid/view/View;");

    jclass RIdClass = env->FindClass("com/demo/nativate/R$id");

    jfieldID sample_textFId = env->GetStaticFieldID(RIdClass, "sample_text", "I");

    jint sample_textF = env->GetStaticIntField(RIdClass, sample_textFId);

    LOGD("动态注册  TextView tv = findViewById(R.id.sample_textFId); be called！");

    jobject tvobject = env->CallObjectMethod(thiz, findViewById_mid, sample_textF);

//    tv.setText(stringFromJNI());

    jclass tvClass = env->GetObjectClass(tvobject);

    jmethodID setText_mid = env->GetMethodID(tvClass, "setText", "(Ljava/lang/CharSequence;)V");

    jstring text = env->NewStringUTF("onCreate-->Native success by c++ !!!");

    env->CallVoidMethod(tvClass, setText_mid, text);

    env->DeleteLocalRef(text);

    LOGD("动态注册  tv.setText(stringFromJNI());; be called！");

}

static int registerNativates(JNIEnv *env) {

    jclass mainActivityClass = env->FindClass("com/demo/nativate/MainActivity");

    if (mainActivityClass == nullptr) {

        return JNI_FALSE;

    }

    JNINativeMethod methods[] = {

            {"onCreate", "(Landroid/os/Bundle;)V", (void *) dynamicRegister}

    };

    int methodsNum = sizeof(methods) / sizeof(methods[0]);

    if (env->RegisterNatives(mainActivityClass, methods, methodsNum) < 0) {

        return JNI_FALSE;

    }

    return JNI_TRUE;

}

jint JNI_OnLoad(JavaVM *vm, void *reserved) {

    LOGD("调用的 JNI_Onload函数");

    //获得JNI环境

    JNIEnv *env = nullptr;

    if ((vm->GetEnv(reinterpret_cast<void **>(&env), JNI_VERSION_1_6)) != JNI_OK) {

        return -1;

    } else {

        if (!registerNativates(env)) {

            return -1;

        }

    }

    return JNI_VERSION_1_6;

}