Android NDK开发_C++多文件-白红宇

Android NDK开发_C++多文件

阅读量：6283 次

发布时间：2019-06-22

本文共 4360 字，大约阅读时间需要 14 分钟。

//我自己测试的一个例子//nativecpp.h#ifndef NATIVECPP_H_#define NATIVECPP_H_int nativeAdd(int x,int y); //C++本地函数声明#endif /* NATIVECPP_H_ *///====================================//nativecpp.cpp#include "nativecpp.h"int nativeAdd(int x,int y) //C++本地函数实现{    return (x*x+y*y);}//====================================//jnicpp.h#ifndef JNICPP_H_#define JNICPP_H_#include 
    
     #include 
     
      extern "C"{JNIEXPORT jint JNICALL Java_com_yprnet_myndkapp1_NDKApp1Activity_Toadd(JNIEnv *env,jobject obj,jint value1,jint value2); //标准的JNI调用函数声明}#endif /* JNICPP_H_ *///====================================//MyNDKApp1.cpp#include "jnicpp.h"#include "nativecpp.h"jint JNICALL Java_com_yprnet_myndkapp1_NDKApp1Activity_Toadd(JNIEnv *env,jobject obj,jint value1,jint value2) //标准的JNI调用函数实现{    value1=value1*10;    value2=value2*10;    return nativeAdd(value1,value2); //JNI函数调用C++本地函数}//====================================//Android.mkLOCAL_PATH := $(call my-dir)include $(CLEAR_VARS)LOCAL_MODULE    := MyNDKApp1### Add all source file names to be included in lib separated by a whitespaceLOCAL_SRC_FILES := MyNDKApp1.cpp nativecpp.cppinclude $(BUILD_SHARED_LIBRARY)//====================================//NDKApp1Activity.javapackage com.yprnet.myndkapp1;import android.os.Bundle;import android.app.Activity;import android.view.Menu;import android.view.View;import android.widget.TextView;import android.widget.Button;public class NDKApp1Activity extends Activity {    static    {        System.loadLibrary("MyNDKApp1"); //加载库，库名为去掉前缀lib和后缀so    }    public native int Toadd(int x,int y); //定义原生方法        @Override    public void onCreate(Bundle savedInstanceState) {        super.onCreate(savedInstanceState);        setContentView(R.layout.activity_ndkapp1);                Button btn=(Button)findViewById(R.id.button1);        btn.setOnClickListener(new View.OnClickListener(){        public void onClick(View v){            int num=Toadd(3,5); //调用NDK方法相加                    String str=String.valueOf(num);            TextView myTextView=null;            myTextView=(TextView)findViewById(R.id.textView1);            myTextView.setText((CharSequence)str);            myTextView=null;        }        });            }    @Override    public boolean onCreateOptionsMenu(Menu menu) {        getMenuInflater().inflate(R.menu.activity_ndkapp1, menu);        return true;    }}//======================================//======================================//======================================//========================//Android NDK开发包上的一个例子//android-ndk-r8b\samples\two-libs//========================//first.h#ifndef FIRST_H#define FIRST_Hextern int first(int  x, int  y);#endif /* FIRST_H *///========================//first.c#include "first.h"int  first(int  x, int  y){    return x + y;}//========================//second.c#include "first.h"#include 
      
       jintJava_com_example_twolibs_TwoLibs_add( JNIEnv*  env,                                      jobject  this,                                      jint     x,                                      jint     y ){    return first(x, y);}//========================//Android.mkLOCAL_PATH:= $(call my-dir)# first lib, which will be built statically#include $(CLEAR_VARS)LOCAL_MODULE    := libtwolib-firstLOCAL_SRC_FILES := first.cinclude $(BUILD_STATIC_LIBRARY)# second lib, which will depend on and include the first one#include $(CLEAR_VARS)LOCAL_MODULE    := libtwolib-secondLOCAL_SRC_FILES := second.cLOCAL_STATIC_LIBRARIES := libtwolib-firstinclude $(BUILD_SHARED_LIBRARY)//========================//TwoLibs.javapackage com.example.twolibs;import android.app.Activity;import android.widget.TextView;import android.os.Bundle;public class TwoLibs extends Activity{    /** Called when the activity is first created. */    @Override    public void onCreate(Bundle savedInstanceState)    {        super.onCreate(savedInstanceState);        TextView  tv = new TextView(this);        int       x  = 1000;        int       y  = 42;        // here, we dynamically load the library at runtime        // before calling the native method.        //        System.loadLibrary("twolib-second");        int  z = add(x, y);        tv.setText( "The sum of " + x + " and " + y + " is " + z );        setContentView(tv);    }    public native int add(int  x, int  y);}