Class doesn't implement Cloneable之怪象

深碍√TFBOYSˉ_ 2023-10-16 20:41 12阅读 0赞

**1. 报错:**

1.  11\-20 14:06:10.89: W/dalvikvm(10190): threadid=15: thread exiting with uncaught exception (group=0x4001d400)
2.  11\-20 14:06:10.360: E/AndroidRuntime(10190): FATAL EXCEPTION: GLThread 10
3.  11\-20 14:06:10: E/AndroidRuntime(10190): java.lang.CloneNotSupportedException: Class doesn't implement Cloneable
4.  11\-20 14:06:10.360: E/AndroidRuntime(10190): at java.lang.Object.clone(Object.java:79)
5.  11\-20 14:06:10.360: E/AndroidRuntime(10190): at com.jnitest.nativetest(Native Method)

**2. 现场说明:**

在进行android项目开发时, 想用java代码调用jni的test函数,, 并且再通过c的callCallBack函数, 回调到java的onCallback函数., 发生以上错误.

**3. 代码:(这里只列出重要的,关键的代码.)**

**java代码:**

public class **NativeClass** \{

private static String TAG= "**NativeClass**";

static \{  
System.loadLibrary("**test-jni**");  
\}

public static int **onCallBack**(int event, int type,String str) \{ //回调回来的回调函数  
Log.i(TAG, "onCallBack======= " + event);  
Log.i(TAG, "onCallBack======= " + type);

Log.i(TAG, "onCallBack======= " + str);

return event;

**public static native int test();** //native函数

**c代码:**

jobject **my\_obj**;  
JNIEnv\* **my\_env**;

extern "C" int callCallBack(int event, int type, const char \*str) ;

extern "C"  
\{

//用于调用java的callback  
int **callCallBack**(int event, int type, const char \*str)  
\{  
int err = 1000;  
jclass objClass = (my\_env)->**FindClass**("com/jnitest/native/NativeClass");  
if(!objClass) \{  
return -1;  
\}  
//获取并调用java层的onCallBack函数  
jmethodID methodId = (my\_env)->**GetStaticMethodID**(objClass, "**onCallBack**", "(IILjava/lang/String;)I");  
if (methodId == 0) \{  
LOGDV("here can not find method %s\\n", "onCallBack");  
\} else \{  
jstring data = (update\_env)->NewStringUTF(str));  
  
err = (my\_env)->**CallStaticIntMethod**(objClass, methodId, event, type, data);  
if(data) my\_env->DeleteLocalRef(data);  
\}

my\_env->DeleteLocalRef(objClass);  
  
  
return err;

**//jni native函数.**  
JNIEXPORT jstring JNICALL  
Java\_com\_jnitest\_native\_**test**( JNIEnv\* env, jobject thiz,jstring testStr )  
\{  
my\_env = env; //必须保存,用于在回调的时候获取回调函数所在的class.  
my\_obj = thiz; //在本程序中,没有用到这个变量.  
const char \*test\_char = (env)->GetStringUTFChars(testStr, NULL);  
  
//调用callCallBack  
int i = **callCallBack**(0,1,test\_char);

return (env)->NewStringUTF(test\_char);

\}  
\}

**测试代码**:

maintest.java:

void testFunc() \{

String s = NativeClass.test("ssss");

Log.i("jniTest", " testFunc s = " + s);

**测试结果**:

onCallBack=======0

onCallBack=======1

onCallBack=======ssss

testFunc s =ssss