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前面讲到了java和native数据类型,这里就开始做一下使用: **第一步:新建工程** **第二部:书写 java方法:** ~~~ public class NativeMethod { static { System.loadLibrary("com_nedu_jni_jnidemo5-jni"); } public native boolean getBoolean(boolean b); public native byte getByte(byte b); public native char getChar(char c); public native short getShort(short s); public native int getInt(int i); public native long getLong(long l); public native float getFloat(float f); public native double getDouble(double d); } ~~~ **第三部:调用javac、javah命令生成h文件。** **第四部:补充native方法,如下:** ~~~ #include<stdio.h> #include <stdlib.h> #include "com_nedu_jni_jnidemo5_NativeMethod.h" /* * Class: com_nedu_jni_jnidemo5_NativeMethod * Method: getBoolean * Signature: (Z)Z */ JNIEXPORT jboolean JNICALL Java_com_nedu_jni_jnidemo5_NativeMethod_getBoolean (JNIEnv *e, jobject thiz, jboolean b){ return b; } /* * Class: com_nedu_jni_jnidemo5_NativeMethod * Method: getByte * Signature: (B)B */ JNIEXPORT jbyte JNICALL Java_com_nedu_jni_jnidemo5_NativeMethod_getByte (JNIEnv *e, jobject thiz, jbyte by){ return by; } /* * Class: com_nedu_jni_jnidemo5_NativeMethod * Method: getChar * Signature: (C)C */ JNIEXPORT jchar JNICALL Java_com_nedu_jni_jnidemo5_NativeMethod_getChar (JNIEnv *e, jobject thiz, jchar c){ return c; } /* * Class: com_nedu_jni_jnidemo5_NativeMethod * Method: getShort * Signature: (S)S */ JNIEXPORT jshort JNICALL Java_com_nedu_jni_jnidemo5_NativeMethod_getShort (JNIEnv *e, jobject thiz, jshort s){ return s; } /* * Class: com_nedu_jni_jnidemo5_NativeMethod * Method: getInt * Signature: (I)I */ JNIEXPORT jint JNICALL Java_com_nedu_jni_jnidemo5_NativeMethod_getInt (JNIEnv *e, jobject thiz, jint i){ return i; } /* * Class: com_nedu_jni_jnidemo5_NativeMethod * Method: getLong * Signature: (J)J */ JNIEXPORT jlong JNICALL Java_com_nedu_jni_jnidemo5_NativeMethod_getLong (JNIEnv *e, jobject thiz, jlong l){ return l; } /* * Class: com_nedu_jni_jnidemo5_NativeMethod * Method: getFloat * Signature: (F)F */ JNIEXPORT jfloat JNICALL Java_com_nedu_jni_jnidemo5_NativeMethod_getFloat (JNIEnv *e, jobject thiz, jfloat f){ return f; } /* * Class: com_nedu_jni_jnidemo5_NativeMethod * Method: getDouble * Signature: (D)D */ JNIEXPORT jdouble JNICALL Java_com_nedu_jni_jnidemo5_NativeMethod_getDouble (JNIEnv *e, jobject thiz, jdouble d){ return d; } ~~~ **第五步:制作mk文件** ~~~ LOCAL_PATH := $(call my-dir) include $(CLEAR_VARS) LOCAL_MODULE := com_nedu_jni_jnidemo5-jni LOCAL_SRC_FILES :=NativeMethod.c include $(BUILD_SHARED_LIBRARY) ~~~ **第六步:调用native方法** ~~~ public void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.main); TextView text=(TextView)findViewById(R.id.text); NativeMethod method=new NativeMethod(); text.setText("返回boolean:"+method.getBoolean(true)+"\n"+ "返回byte:"+method.getByte((byte) 0)+"\n"+ "返回char:"+method.getChar('c')+"\n"+ "返回short:"+method.getShort((short) 1)+"\n"+ "返回int:"+method.getInt(1)+"\n"+ "返回long:"+method.getLong(9)+"\n"+ "返回float:"+method.getFloat((float) 1.0)+"\n"+ "返回double:"+method.getDouble(2.0)+"\n"); } ~~~ 运行截图: ![](https://box.kancloud.cn/2016-01-14_56971f3fa96ae.gif) 总结:JNI中传过来的java基本类型可以直接使用。