JNI之C/C++層調用Java

調用靜態方法

jmethodID cb = env->GetStaticMethodID(thiz, "createBitmap", "(II)Landroid/graphics/Bitmap;");
    jobject bitmap = env->CallStaticObjectMethod(thiz, cb, metaInfo.dataW, metaInfo.dataH);

給變量賦值

jclass snapInfoClass = env->FindClass("com/example/jni/SnapInfo");
    jmethodID constructor = env->GetMethodID(snapInfoClass, "<init>", "()V");
    jobject jSnapInfo = env->NewObject(snapInfoClass, constructor);

    jfieldID jexpTimeId = env->GetFieldID(snapInfoClass, "expTime", "[I");
    jintArray jexpTime = env->NewIntArray(snapInfo.realNum);
    jint* expTime = env->GetIntArrayElements(jexpTime, NULL);
    //向expTime賦值
    env->ReleaseIntArrayElements(jexpTime, expTime, JNI_OK);
    env->SetObjectField(jSnapInfo, jexpTimeId, jexpTime);

package com.example.jni;


public class SnapInfo {
    public int[] expTime;
    public float[] expGain;
    public int[] expNum;
    public int realNum;
    public int costTime;
}