【android 开 发 】 - Android studio 下 NDK Jni 开发 简单例子

 1 /* DO NOT EDIT THIS FILE - it is machine generated */
 2 #include <jni.h>
 3 /* Header for class com_yip_yipjnidemo_JniText */
 4 
 5 #ifndef _Included_com_yip_yipjnidemo_JniText
 6 #define _Included_com_yip_yipjnidemo_JniText
 7 #ifdef __cplusplus
 8 extern "C" {
 9 #endif
10 /*
11  * Class:     com_yip_yipjnidemo_JniText
12  * Method:    getCLangString
13  * Signature: ()Ljava/lang/String;
14  */
15 JNIEXPORT jstring JNICALL Java_com_yip_yipjnidemo_JniText_getCLangString
16   (JNIEnv *, jobject);
17 
18 #ifdef __cplusplus
19 }
20 #endif
21 #endif

 1 #include "com_yip_yipjnidemo_JniText.h"
 2 /*
 3  * Class:     io_github_yanbober_ndkapplication_NdkJniUtils
 4  * Method:    getCLanguageString
 5  * Signature: ()Ljava/lang/String;
 6  */
 7 JNIEXPORT jstring JNICALL Java_com_yip_yipjnidemo_JniText_getCLangString(JNIEnv *env, jobject obj)
 8 {
 9   return (*env)->NewStringUTF(env,"This just a test for Android Studio NDK JNI developer!");
10 }

1 defaultConfig下添加
2     ndk{
3         moduleName "jnitext"         //生成的so名字
4             abiFilters "armeabi", "armeabi-v7a", "x86"  //输出指定三种abi体系结构下的so库。目前可有可无。
5     }

 1 package com.yip.yipjnidemo;
 2 
 3 import android.app.Activity;
 4 import android.support.v7.app.AppCompatActivity;
 5 import android.os.Bundle;
 6 import android.widget.TextView;
 7 
 8 public class MainActivity extends Activity {
 9 
10 
11     private TextView txtView;
12 
13     @Override
14     protected void onCreate(Bundle savedInstanceState) {
15         super.onCreate(savedInstanceState);
16         setContentView(R.layout.activity_main);
17         txtView= (TextView) findViewById(R.id.txt_jnitext);
18         JniText jniText=new JniText();
19         txtView.setText(jniText.getCLangString());
20     }
21 }

 1 package com.yip.yipjnidemo;
 2 
 3 /**
 4  * Created by Administrator on 2016/2/22.
 5  */
 6 public class JniText {
 7     static {
 8             System.loadLibrary("jnitext");   //defaultConfig.ndk.moduleName
 9         }
10     public native String getCLangString();
11 }