一、Debug调试效果

DEBUG.png

二、配置JNI调试环境

2.1 配置build.gradle

build.png

只需配置android标签节点下的buildTypes
buildTypes{    
   debug{
        jniDebuggable true
        jniDebuggable = true
    }
}

2.2 配置AndroidManifest属性

android:debuggable="true"

<application android:label="@string/app_name"             
android:debuggable="true">
<activity android:name=".HelloJni"              
android:label="@string/app_name">
        
<intent-filter>
<action android:name="android.intent.action.MAIN" />            
<category android:name="android.intent.category.LAUNCHER" />
</intent-filter>
    </activity>
</application>

2.3 配置Run/Debug configurations

config.png

• 选择run下拉item，选Edit Configurations,弹出配置窗体
• 点击➕新建 configuraionts，选android native条目
• 配置下native执行的名称如：hellojniNative.
• 选择真机或模拟器调试.

三、code

源码取的是ndk目录下hellojni demo，可以自行去获取

3.1 java code

public native String  stringFromJNI();
    /** Called when the activity is first created. */    
@Override
    public void onCreate(Bundle savedInstanceState)    {
        super.onCreate(savedInstanceState);        
        /* Create a TextView and set its content. 
        * the text is retrieved by calling a native
         * function. 
        */
        final TextView  tv = new TextView(this);
        tv.setText("点击调用方法");
        tv.setTextSize(100);
        tv.setClickable(true);
        tv.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
//              start(tv);
                tv.setText(stringFromJNI());
            }
        }); 
       setContentView(tv);
    }

3.2 natvie code

jstringJava_com_example_hellojni_HelloJni_stringFromJNI( JNIEnv* env,
                                                  jobject this )
{
#if defined(__arm__)
  #if defined(__ARM_ARCH_7A__)
    #if defined(__ARM_NEON__)
      #if defined(__ARM_PCS_VFP)
        #define ABI "armeabi-v7a/NEON (hard-float)" 
     #else
        #define ABI "armeabi-v7a/NEON"
      #endif
    #else
      #if defined(__ARM_PCS_VFP)
        #define ABI "armeabi-v7a (hard-float)"
      #else
        #define ABI "armeabi-v7a"
      #endif
    #endif 
 #else
   #define ABI "armeabi"
  #endif#elif defined(__i386__)
   #define ABI "x86"#elif defined(__x86_64__)
   #define ABI "x86_64"#elif defined(__mips64)
  /* mips64el-* toolchain defines __mips__ too */
   #define ABI "mips64"#elif defined(__mips__)
   #define ABI "mips"#elif defined(__aarch64__)
   #define ABI "arm64-v8a"#else
   #define ABI "unknown"#endif
    return (*env)->NewStringUTF(env, "Hello from JNI !  Compiled with ABI " ABI ".");
}