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                **Android NDK開發學習(五):JNI數據類型** 調用一個Java native方法的時候,方法中的參數需要傳給C/C++本地函數中。 首先可以看之前的demo,stringFromJNI方法中傳入一個String類型參數。 ~~~ public class GetString { public native String stringFromJNI(String string); } ~~~ 接下來是com_example_jnitest_GetString.h文件中的接收 ~~~ #include <jni.h> /* Header for class com_example_jnitest_GetString */ #ifndef _Included_com_example_jnitest_GetString #define _Included_com_example_jnitest_GetString #ifdef __cplusplus extern "C" { #endif /* * Class: com_example_jnitest_GetString * Method: stringFromJNI * Signature: (Ljava/lang/String;)Ljava/lang/String; */ JNIEXPORT jstring JNICALL Java_com_example_jnitest_GetString_stringFromJNI (JNIEnv *, jobject, jstring); #ifdef __cplusplus } #endif #endif ~~~ 從頭文件函數的原型可以得知,stringFromJNI方法中形參的數據類型自動轉換成了JNI中相應的數據類型(String ····> jstring) 剩余的類型就不一一的贅述了。可以參考下表。 ![](https://box.kancloud.cn/2016-04-26_571f24eb4cc40.jpg) ![](https://box.kancloud.cn/2016-04-26_571f24eb645d6.jpg)
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