Android在编写NDK/JNI时注意的问题

---------------------------------------华丽的分割线-----------------------------------------

?

当你使用简单的本地方法时，有以下：?

?

Android.mk

LOCAL_PATH := $(call my-dir)include $(CLEAR_VARS)LOCAL_C_INCLUDES := $(LOCAL_PATH)/includeLOCAL_LDLIBS += -L$(SYSROOT)/usr/lib -llogLOCAL_MODULE    := testSumLOCAL_SRC_FILES := testSum.cinclude $(BUILD_SHARED_LIBRARY)

?

(JAVA)TestJni.java:

package com.test;import android.app.Activity;import android.os.Bundle;import android.util.Log;public class TestJni extends Activity {private static final String TAG = "TestJni:";    @Override    public void onCreate(Bundle savedInstanceState) {        super.onCreate(savedInstanceState);        setContentView(R.layout.main);        Log.v(TAG, "" + getSum(2, 3));    }              public native int getSum(int x, int y);        static{    System.loadLibrary("testSum");    }}

?

?

(JNI)testSum.c:

#include <string.h>#include <android/log.h>#include <jni.h>jint Java_com_test_TestJni_getSum(JNIEnv* env, jobject thiz,jint x,jint y){//该方法为打印的方法__android_log_print(ANDROID_LOG_INFO, "JNIMsg", "Get Param:  x=%d y=%d ", x,y);return x + y;}

?

?

?注意点：

"Java_com_test_TestJni_getSum"中“com_test_TestJni”一定要与实际包名一致，包括大小写"Java_com_test_TestJni_getSum"中“getSum”一定要与java类中的方法名一致，包括大小写?“LOCAL_MODULE??? := testSum”和“System.loadLibrary("testSum");”中的库名“testSum”要一致，包括大小写

?

?

?