java - 应用程序意外停止。强制关闭。该怎么办？

Question

public void onManagerConnected(int status) {

          switch (status) {
              case LoaderCallbackInterface.SUCCESS:
              {
                  Log.i(TAG, "OpenCV loaded successfully");


                  System.loadLibrary("detection_based_tracker");


                  try {

InputStream is = getResources().openRawResource(R.raw.lbpcascade_frontalface);

File cascadeDir = getDir("cascade", Context.MODE_PRIVATE);

mCascadeFile = new File(cascadeDir, "lbpcascade_frontalface.xml");

FileOutputStream os = new FileOutputStream(mCascadeFile);


                      byte[] buffer = new byte[4096];
                      int bytesRead;
                      while ((bytesRead = is.read(buffer)) != -1) {
                          os.write(buffer, 0, bytesRead);
                      }
                      is.close();
                      os.close();


                      mJavaDetector = new CascadeClassifier(mCascadeFile.getAbsolutePath());



                      if (mJavaDetector.empty()) {
                          Log.e(TAG, "Failed to load cascade classifier");
                          mJavaDetector = null;
                      } else
         Log.i(TAG, "Loaded cascade classifier from " + mCascadeFile.getAbsolutePath());

                      cascadeDir.delete();
                  } catch (IOException e) {
                      e.printStackTrace();
                      Log.e(TAG, "Failed to load cascade. Exception thrown: " + e);
                  }

                  mOpenCvCameraView.enableView();
              } break;
              default:
              {
                  super.onManagerConnected(status);
              } break;
          }
      }
  };



  public Mat onCameraFrame(CvCameraViewFrame inputFrame) 
    {


        mRgba = inputFrame.rgba();
        mGray = inputFrame.gray();



        if (mAbsoluteFaceSize == 0) {
            int height = mGray.rows();
            if (Math.round(height * mRelativeFaceSize) > 0) {
                mAbsoluteFaceSize = Math.round(height * mRelativeFaceSize);
            }



        }


          MatOfRect faces = new MatOfRect();

          if (mDetectorType == JAVA_DETECTOR){   
                  if (mJavaDetector != null)
     mJavaDetector.detectMultiScale(mGray, faces, 1.1, 2, 2,  
                       new Size(mAbsoluteFaceSize, mAbsoluteFaceSize), new Size());

           }

          else {
              Log.e(TAG, "Detection method is not selected!");
          }


  Rect[] facesArray = faces.toArray();
 for (int i = 0; i < facesArray.length; i++)
            {

  Core.rectangle(mRgba, facesArray[i].tl(), facesArray[i].br(), FACE_RECT_COLOR, 5);
    }
    return mRgba;

}

执行此代码进行人脸检测时。我得到了这个，应用程序意外停止。我决定在没有任何选项的情况下进行面部检测。那么有人可以建议我我的代码有什么问题吗？

提前致谢。

日志猫
01-24 09:50:04.605: D/dalvikvm(335): newInstance 失败: p0 i0 [0 a1

01-24 09:50:04.605: D/AndroidRuntime(335):关闭虚拟机

01-24 09:50:04.605: W/dalvikvm(335): threadid=1: 线程因未捕获的异常而退出 (group=0x40015560)

01-24 09:50:04.625: E/AndroidRuntime(335): 致命异常:main

01-24 09:50:04.625: E/AndroidRuntime(335): java.lang.RuntimeException: 无法实例化 Activity ComponentInfo{com.example.faces/com.example.faces.MainActivity}: java.lang。 InstantiationException:com.example.faces.MainActivity

01-24 09:50:04.625: E/AndroidRuntime(335): 在 android.app.ActivityThread.performLaunchActivity(ActivityThread.java:1569)

01-24 09:50:04.625: E/AndroidRuntime(335): 在 android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:1663)

01-24 09:50:04.625: E/AndroidRuntime(335): 在 android.app.ActivityThread.access$1500(ActivityThread.java:117)

01-24 09:50:04.625: E/AndroidRuntime(335): 在 android.app.ActivityThread$H.handleMessage(ActivityThread.java:931)

01-24 09:50:04.625: E/AndroidRuntime(335): 在 android.os.Handler.dispatchMessage(Handler.java:99)

01-24 09:50:04.625: E/AndroidRuntime(335): 在 android.os.Looper.loop(Looper.java:123)

01-24 09:50:04.625: E/AndroidRuntime(335): 在 android.app.ActivityThread.main(ActivityThread.java:3683)

01-24 09:50:04.625: E/AndroidRuntime(335): 在 java.lang.reflect.Method.invokeNative( native 方法)

01-24 09:50:04.625: E/AndroidRuntime(335): 在 java.lang.reflect.Method.invoke(Method.java:507)

01-24 09:50:04.625: E/AndroidRuntime(335): 在 com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:839)

01-24 09:50:04.625: E/AndroidRuntime(335): 在 com.android.internal.os.ZygoteInit.main(ZygoteInit.java:597)

01-24 09:50:04.625: E/AndroidRuntime(335): at dalvik.system.NativeStart.main( native 方法)

01-24 09:50:04.625: E/AndroidRuntime(335): 引起:java.lang.InstantiationException: com.example.faces.MainActivity

01-24 09:50:04.625: E/AndroidRuntime(335): 在 java.lang.Class.newInstanceImpl( native 方法)

01-24 09:50:04.625: E/AndroidRuntime(335): 在 java.lang.Class.newInstance(Class.java:1409)

01-24 09:50:04.625: E/AndroidRuntime(335): 在 android.app.Instrumentation.newActivity(Instrumentation.java:1021)

01-24 09:50:04.625: E/AndroidRuntime(335): 在 android.app.ActivityThread.performLaunchActivity(ActivityThread.java:1561)

01-24 09:50:04.625: E/AndroidRuntime(335): ... 11 更多

Answer 1

Caused by: java.lang.InstantiationException: com.example.faces.MainActivity

确保您的 MainActivity 类可以实例化。造成这种情况的一些常见原因:

• 该类是抽象。

• 有一个显式构造函数，它接受参数。 Activity 实际上不应该需要显式构造函数。如果提供了，则不应带任何参数。