一手遮天 Android - 输入: Gesture 识别手势(遍历手势库中的手势,通过逐一比对来识别当前手势)
示例如下:
/input/GestureDemo3.java
/**
* Gesture 识别手势(遍历手势库中的手势,通过逐一比对来识别当前手势)
*
* 本例演示
* 在绘制区绘制手势(支持多笔),然后与手势库中的手势进行比对,并返回匹配度较高的手势列表
*/
package com.webabcd.androiddemo.input;
import android.app.AlertDialog;
import android.gesture.Gesture;
import android.gesture.GestureLibraries;
import android.gesture.GestureLibrary;
import android.gesture.GestureOverlayView;
import android.gesture.Prediction;
import androidx.appcompat.app.AppCompatActivity;
import android.os.Bundle;
import android.util.Log;
import android.view.MotionEvent;
import android.widget.ArrayAdapter;
import android.widget.Toast;
import com.webabcd.androiddemo.R;
import java.util.ArrayList;
public class GestureDemo3 extends AppCompatActivity {
private final String LOG_TAG = "GestureDemo3";
private GestureOverlayView mGestureOverlayView;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_input_gesturedemo3);
mGestureOverlayView = findViewById(R.id.gestureOverlayView);
sample();
}
private void sample() {
/**
* GestureLibraries.fromFile() - 通过指定的路径或文件实例化手势库
* GestureLibraries.fromRawResource() - 通过指定的资源实例化手势库
* boolean load() - 加载手势库(返回值代表加载成功还是失败)
*/
final GestureLibrary gestureLibrary = GestureLibraries.fromFile(getFilesDir() + "/myGestures/");
if (gestureLibrary.load()) {
Toast.makeText(this, "手势库加载成功", Toast.LENGTH_SHORT).show();
} else {
Toast.makeText(this, "手势库加载失败", Toast.LENGTH_SHORT).show();
}
// 手势识别完成
mGestureOverlayView.addOnGesturePerformedListener(new GestureOverlayView.OnGesturePerformedListener() {
@Override
public void onGesturePerformed(GestureOverlayView gestureOverlayView, final Gesture gesture) {
// 手势识别完成
Log.d(LOG_TAG, "onGesturePerformed");
/**
* GestureLibrary - 手势库
* recognize() - 遍历手势库中的手势,返回匹配的全部手势
* Prediction - 匹配结果
* name - 手势名称
* score - 匹配度(0 - 10 之间)
*/
ArrayList<Prediction> predictions = gestureLibrary.recognize(gesture);
ArrayList<String> result = new ArrayList<String>();
for (Prediction prediction : predictions) {
if (prediction.score > 1.0) {
result.add(String.format("与手势“%s”的匹配度为:%f", prediction.name, prediction.score));
}
}
if (result.size() > 0) {
// 显示所有匹配度较高的手势
ArrayAdapter<Object> adapter = new ArrayAdapter<Object>(GestureDemo3.this, android.R.layout.simple_dropdown_item_1line, result.toArray());
new AlertDialog.Builder(GestureDemo3.this).setAdapter(adapter,null).setPositiveButton("确定",null).show();
} else {
// 找不到匹配的手势
Toast.makeText(GestureDemo3.this,"找不到匹配的手势",Toast.LENGTH_SHORT).show();
}
}
});
// 手势绘制监听
mGestureOverlayView.addOnGesturingListener(new GestureOverlayView.OnGesturingListener() {
// 手势绘制开始
// 如果只画一条直线是不会回调这里的,因为一条直线不算是手势(绘制时至少要达到一个弧线或一个折线之类的才算是手势,才会执行到这里)
@Override
public void onGesturingStarted(GestureOverlayView overlay) {
Log.d(LOG_TAG, "onGesturingStarted");
}
// 手势绘制结束
@Override
public void onGesturingEnded(GestureOverlayView overlay) {
Log.d(LOG_TAG, "onGesturingEnded");
}
});
// 路径绘制监听
mGestureOverlayView.addOnGestureListener(new GestureOverlayView.OnGestureListener() {
// 路径绘制开始时(就是手指按下时)
@Override
public void onGestureStarted(GestureOverlayView overlay, MotionEvent event) {
Log.d(LOG_TAG, "onGestureStarted");
}
// 路径绘制继续
@Override
public void onGesture(GestureOverlayView overlay, MotionEvent event) {
Log.d(LOG_TAG, "onGesture");
}
// 路径绘制结束
@Override
public void onGestureEnded(GestureOverlayView overlay, MotionEvent event) {
Log.d(LOG_TAG, "onGestureEnded");
}
@Override
public void onGestureCancelled(GestureOverlayView overlay, MotionEvent event) {
Log.d(LOG_TAG, "onGestureCancelled");
}
});
}
}
/layout/activity_input_gesturedemo3.xml
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:orientation="vertical">
<!--
GestureOverlayView - 手势绘制区域
gestureColor - 手势绘制的颜色
gestureStrokeWidth - 手势绘制线条的宽度
gestureStrokeType - 手势绘制类型
single - 只允许 1 笔
multiple - 允许多笔
fadeOffset - 手指离开后多长时间开始识别(单位:毫秒)
比如一个手势需要多笔绘制时,这个值可以设置的大一点,以避免还没绘制完就去识别了
-->
<android.gesture.GestureOverlayView
android:id="@+id/gestureOverlayView"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:background="@color/red"
android:gestureColor="@color/green"
android:gestureStrokeWidth="5"
android:gestureStrokeType="multiple"
android:fadeOffset="1000"/>
</LinearLayout>