AndroidStudio：手势识别

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
  xmlns:app="http://schemas.android.com/apk/res-auto"
  xmlns:tools="http://schemas.android.com/tools"
  android:layout_width="match_parent"
  android:layout_height="match_parent"
  tools:context=".MainActivity"
  android:orientation="vertical">
 
  <TextView
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:text="Gesture:"
    android:id="@ id/tv"
    android:textSize="24dp"/>
 
  <Button
    android:layout_width="match_parent"
    android:layout_height="wrap_content"
    android:textSize="20dp"
    android:text="clear"
    android:id="@ id/bt"/>
 
  <android.gesture.GestureOverlayView
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:gestureStrokeType="multiple"
    android:eventsInterceptionEnabled="false"
    android:orientation="vertical"
    android:id="@ id/gesture"></android.gesture.GestureOverlayView>
</LinearLayout

package com.example.myapplication;
 
import android.gesture.Gesture;
import android.gesture.GestureLibraries;
import android.gesture.GestureLibrary;
import android.gesture.GestureOverlayView;
import android.gesture.Prediction;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.view.View;
import android.widget.Button;
import android.widget.TextView;
import android.widget.Toast;
 
import java.util.ArrayList;
 
public class MainActivity extends AppCompatActivity implements GestureOverlayView.OnGesturePerformedListener {
  GestureLibrary mLibrary; //定义手势库对象
  GestureOverlayView gest; //定义手势视图对象做画板之用
  TextView txt;
  Button bt;
 
  @Override
  protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_main);
 
    gest = (GestureOverlayView)findViewById(R.id.gesture);
    gest.addOnGesturePerformedListener(this); // 注册手势识别的监听器
    txt = (TextView)findViewById(R.id.tv);
    mLibrary = GestureLibraries.fromRawResource(this,R.raw.gestures); //加载手势库
    bt = (Button)findViewById(R.id.bt);
    bt.setOnClickListener(new Click());
 
    if (!mLibrary.load()) {
      finish();
    }
  }
    /*根据画的手势识别是否匹配手势库里的手势*/
  @Override
  public void onGesturePerformed(GestureOverlayView gest, Gesture gesture) {
    ArrayList gestList = mLibrary.recognize(gesture); // 从手势库获取手势数据
    if (gestList.size() > 0) {
      Prediction pred = (Prediction)gestList.get(0);
      if (pred.score > 1.0) {  // 检索到匹配的手势
        Toast.makeText(this,pred.name,Toast.LENGTH_SHORT).show();
        txt.append(pred.name);
      }
    }
  }
 
  private class Click implements View.OnClickListener {
    @Override
    public void onClick(View view) {
      txt.setText("Gesture:");
    }
  }
}