android studio的手势代码

以下是一个使用Android Studio的手势识别的示例代码：

import android.gesture.Gesture;
import android.gesture.GestureLibraries;
import android.gesture.GestureLibrary;
import android.gesture.GestureOverlayView;
import android.gesture.GestureStroke;
import android.gesture.GestureUtils;
import android.gesture.Prediction;
import android.os.Bundle;
import android.support.v7.app.AppCompatActivity;
import android.widget.Toast;

import java.util.ArrayList;

public class MainActivity extends AppCompatActivity implements GestureOverlayView.OnGesturePerformedListener {
    private GestureLibrary gestureLibrary;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);

        GestureOverlayView gestureOverlayView = findViewById(R.id.gestureOverlayView);
        gestureOverlayView.addOnGesturePerformedListener(this);

        gestureLibrary = GestureLibraries.fromRawResource(this, R.raw.gestures);
        if (!gestureLibrary.load()) {
            Toast.makeText(this, "手势库加载失败", Toast.LENGTH_SHORT).show();
        }
    }

    @Override
    public void onGesturePerformed(GestureOverlayView overlay, Gesture gesture) {
        ArrayList<Prediction> predictions = gestureLibrary.recognize(gesture);
        if (predictions.size() > 0) {
            Prediction prediction = predictions.get(0);
            if (prediction.score > 2.0) {
                Toast.makeText(this, "识别到手势：" + prediction.name, Toast.LENGTH_SHORT).show();
            } else {
                Toast.makeText(this, "无法识别手势", Toast.LENGTH_SHORT).show();
            }
        }
    }
}

这段代码演示了如何在Android Studio中使用手势识别。首先，我们需要在`onCreate`方法中加载手势库文件。然后，我们将`GestureOverlayView`添加到布局中，并设置`OnGesturePerformedListener`监听器。当手势被执行时，`onGesturePerformed`方法将被调用。在这个方法中，我们使用`gestureLibrary.recognize`方法来识别手势，并根据识别结果进行相应的操作。