我想使用dlib库进行人脸检测,但它不适用于旧手机。
我崩溃了以下堆栈跟踪:
E/AndroidRuntime( 4288): FATAL EXCEPTION: pool-1-thread-1
E/AndroidRuntime( 4288): java.lang.ExceptionInInitializerError
E/AndroidRuntime( 4288): at com.tzutalin.dlibtest.MainActivity.runDetectAsync(MainActivity.java:235)
E/AndroidRuntime( 4288): at com.tzutalin.dlibtest.MainActivity_.access$301(MainActivity_.java:34)
E/AndroidRuntime( 4288): at com.tzutalin.dlibtest.MainActivity_$6.execute(MainActivity_.java:158)
E/AndroidRuntime( 4288): at org.androidannotations.api.BackgroundExecutor$Task.run(BackgroundExecutor.java:405)
E/AndroidRuntime( 4288): at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:442)
E/AndroidRuntime( 4288): at java.util.concurrent.FutureTask$Sync.innerRun(FutureTask.java:305)
E/AndroidRuntime( 4288): at java.util.concurrent.FutureTask.run(FutureTask.java:137)
E/AndroidRuntime( 4288): at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:150)
E/AndroidRuntime( 4288): at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:264)
E/AndroidRuntime( 4288): at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1076)
E/AndroidRuntime( 4288): at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:569)
E/AndroidRuntime( 4288): at java.lang.Thread.run(Thread.java:856)
E/AndroidRuntime( 4288): Caused by: java.lang.NoSuchFieldError: no field with name='mLabel' signature='java/lang/String' in class Lcom/tzutalin/dlib/VisionDetRet;
E/AndroidRuntime( 4288): at com.tzutalin.dlib.PeopleDet.jniNativeClassInit(Native Method)
E/AndroidRuntime( 4288): at com.tzutalin.dlib.PeopleDet.<clinit>(PeopleDet.java:42)
E/AndroidRuntime( 4288): ... 12 more
所以,C代码看起来像这样:
void JNIEXPORT DLIB_JNI_METHOD(jniNativeClassInit)(JNIEnv* env, jclass _this) {
jclass detRetClass = env->FindClass("com/tzutalin/dlib/VisionDetRet");
CHECK_NOTNULL(detRetClass);
gVisionDetRetOffsets.label =
env->GetFieldID(detRetClass, "mLabel", "java/lang/String");
gVisionDetRetOffsets.confidence =
env->GetFieldID(detRetClass, "mConfidence", "F");
gVisionDetRetOffsets.left = env->GetFieldID(detRetClass, "mLeft", "I");
gVisionDetRetOffsets.top = env->GetFieldID(detRetClass, "mTop", "I");
gVisionDetRetOffsets.right = env->GetFieldID(detRetClass, "mRight", "I");
gVisionDetRetOffsets.bottom = env->GetFieldID(detRetClass, "mBottom", "I");
gVisionDetRetOffsets.addLandmark =
env->GetMethodID(detRetClass, "addLandmark", "(II)Z");
if (gVisionDetRetOffsets.addLandmark == NULL) {
LOG(FATAL) << "Can't Find Method addLandmark(int,int)";
}
LOG(INFO) << "JniNativeClassIni Success";
}
相关的Java类:
public final class VisionDetRet {
private String mLabel;
private float mConfidence;
private int mLeft;
private int mTop;
private int mRight;
private int mBottom;
private ArrayList<Point> mLandmarkPoints = new ArrayList<>();
VisionDetRet() {
}
// Other code
}
因此,字段显然在这里,它获得了类(CHECK_NOTNULL(detRetClass)
成功)。那为什么它会在旧手机上崩溃? Google没有多大帮助,而且我对NDK / JNI的新东西也很陌生。
答案 0 :(得分:3)
我不确定这对任何Android版本的效果如何,因为java/lang/String
是GetFieldID
的错误签名。
对于课程,签名应为L fully-qualified-class ;
,因此在您的情况下,您需要Ljava/lang/String;