Android手势识别——竖线

Question

我正在创建一个安卓应用程序。我在其中识别线（垂直和水平）。我已经使用了以下步骤。

1) Creating straight lines gesture file using "Gestures Builder" application. 
2) Added the "gestures" file in my application and used the "OnGesturePerformedListener" to recognize the line.

The problem is,
I can't recognize the vertical lines(Both Top to Bottom & Bottom to Top).

我可以识别垂直线以外的直线。有人可以知道如何获得垂直线检测吗？

代码sn-p：

public class GestureActivity extends Activity implements OnGesturePerformedListener {
    private GestureLibrary mLibrary;

@Override
public void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    GestureOverlayView gestureOverlayView = new GestureOverlayView(this);
    View inflate = getLayoutInflater().inflate(R.layout.activity_gesture,
            null);
    gestureOverlayView.addView(inflate);
    gestureOverlayView.addOnGesturePerformedListener(this);
    mLibrary = GestureLibraries.fromRawResource(this, R.raw.gestures);
    if (!mLibrary.load()) {
        finish();
    }
    setContentView(gestureOverlayView);
}

@Override
public void onGesturePerformed(GestureOverlayView overlay, Gesture gesture) {
    ArrayList<Prediction> predictions = mLibrary.recognize(gesture);
    if (predictions.size() > 0) {
        Prediction prediction = predictions.get(0);
        if (prediction.name.equals("Line") && prediction.score > 1.0) {
            Toast.makeText(this, "Line", Toast.LENGTH_LONG).show();
        }
    }

}

}

Answer 1

我终于找到了解决方案。答案如下。

gestureOverlayView.setGestureStrokeAngleThreshold( 90.0f);

参考：https://stackoverflow.com/a/22807326/1485254