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我正在开发一个用于性别识别的 Android 应用程序。

现在我想访问保存为非静态字符串的分类结果public String GENDER，在public class Camera2BasicFragment extends Fragment implements FragmentCompat.OnRequestPermissionsResultCallback. 我想从MainActivity课堂上访问它。

我Camera2BasicFragment班上有一个分类方法。

private void classifyFrame() {
    if (gclassifier == null || eclassifier == null || getActivity() == null || cameraDevice == null) {
      showToast("Uninitialized Classifier or invalid context.");
      return;
    }
    Bitmap bitmap_g =
        textureView.getBitmap(GenderClassifier.DIM_IMG_SIZE_X, GenderClassifier.DIM_IMG_SIZE_Y);
    Bitmap bitmap_e =
            textureView.getBitmap(EmotionClassifier.DIM_IMG_SIZE_X, EmotionClassifier.DIM_IMG_SIZE_Y);
    GENDER = gclassifier.classifyFrame(bitmap_g);
    EMOTION = eclassifier.classifyFrame(bitmap_e);
    String textToShow =  GENDER + EMOTION;
    bitmap_g.recycle();
    bitmap_e.recycle();
    showToast(textToShow);
  }

MainActivity当我从如下访问变量时，它给了我一个 NullPointerException。

if (Camera2BasicFragment.newInstance().GENDER.equals("female")) {
      speech = dialogs.greetings.get("female_senior_happiness");
    }

我尝试在Camera2BasicFragment类中使用 getter 方法，如下所示。

public Bitmap bitmap_g; // Passes the bitmap for gender classification. 
public String classifyGender(Bitmap bitmap) {
    return gclassifier.classifyFrame(bitmap);
  }

但是，传入的位图变量也是空的。

我知道这听起来像是一个常见的问题，但我有点无能为力。非常感谢任何帮助。提前致谢！

编辑：更新MainActiivty.


  @Override
  protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_camera);
    if (null == savedInstanceState) {
      getFragmentManager()
              .beginTransaction()
              .replace(R.id.container, Camera2BasicFragment.newInstance())
              .commit();
    }
    mRobotAPI = new RobotAPI(this, robotCallback);
    dialogs = new Dialogs();

    //Initial speech config
    speakConfig.timeout(30);
    speakConfig.volume(60);
    speakConfig.languageId(DialogSystem.LANGUAGE_ID_ZH_TW);
    speakConfig.alwaysListenState(SpeakConfig.MODE_FOREVER);
  }

  //public String gender = Camera2BasicFragment.newInstance().classifyGender(Camera2BasicFragment.newInstance().bitmap_g);
  //public String emotion = Camera2BasicFragment.newInstance().EMOTION;

  public void sayWithExpression(){
    String speech = "Hello World";
    if (Camera2BasicFragment.GENDER.equals("female")) {
      speech = dialogs.greetings.get("female_senior_happiness");
    }

    Log.d(TAG, "say /w ex " + speech);

    //In debugging mode we ignore this for efficiency
    //mRobotAPI.robot.setExpression(generate_expression(speech));
    mRobotAPI.robot.setExpression(RobotFace.HAPPY);
    mRobotAPI.robot.speak(speech, speakConfig);
  }

  @Override
  protected void onResume() {
    super.onResume();
    mRobotAPI.robot.registerListenCallback(robotListenCallback);
    sayWithExpression();
  }

...
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1 回答 1

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Camera2BasicFragment.GENDER-> 看起来您已将 GENDER 变量设为静态，您可以将其设为非静态并且在 MainActivity 中应该有一个成员变量，即

Camera2BasicFragment fragment = Camera2BasicFragment.newInstance();

然后fragment在您的 MainActivityonCreate和onResume（即在sayWithExpression方法中）使用它

于 2019-08-01T07:23:40.267 回答