Android實(shí)現(xiàn)自定義手勢(shì)和識(shí)別手勢(shì)的功能

更新時(shí)間：2019年10月11日 15:00:16 作者：季風(fēng)__

這篇文章主要介紹了Android實(shí)現(xiàn)自定義手勢(shì)和識(shí)別手勢(shì)的功能，本文通過(guò)實(shí)例代碼給大家介紹的非常詳細(xì),具有一定的參考借鑒價(jià)值，需要的朋友可以參考下

1. 先完成自定義手勢(shì)的Activity

1.1 因?yàn)樾枰鎯?chǔ)手勢(shì)文件所以需要聲明權(quán)限：

<uses-permission android:name="android.permission.READ_EXTERNAL_STORAGE" /> //讀取SD卡權(quán)限
<uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE" /> //寫(xiě)入SD卡權(quán)限

1.2 簡(jiǎn)單寫(xiě)一個(gè)布局文件，其中用到了GestureOverlayView，相當(dāng)于一個(gè)繪制組件。其中有一個(gè)重要屬性gestureStrokeType，值為single時(shí)表示只繪制一筆，若要多筆繪制值應(yīng)該設(shè)為multiple：

<?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"
 android:orientation="vertical"
 tools:context=".addgesture.Main3Activity">
 <Button
  android:layout_width="match_parent"
  android:layout_height="wrap_content"
  android:onClick="recognition"
  android:text="識(shí)別手勢(shì)" />
 <TextView
  android:layout_width="match_parent"
  android:layout_height="wrap_content"
  android:gravity="center"
  android:text="請(qǐng)繪制手勢(shì)" />
 <android.gesture.GestureOverlayView
  android:id="@+id/activity_main3_gov"
  android:layout_width="match_parent"
  android:layout_height="match_parent"
  android:gestureStrokeType="multiple" //多筆繪制
  ></android.gesture.GestureOverlayView>
</LinearLayout>

1.3 這里自定義了AlertDialog的樣式；

<?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">
 <LinearLayout
  android:layout_width="match_parent"
  android:layout_height="wrap_content">
  <TextView
   android:layout_width="wrap_content"
   android:layout_height="match_parent"
   android:gravity="center"
   android:text="請(qǐng)輸入手勢(shì)名稱(chēng)" />
  <EditText  //輸入手勢(shì)的名稱(chēng)
   android:id="@+id/save_dialog_et"
   android:layout_width="match_parent"
   android:layout_height="match_parent" />
 </LinearLayout>
 <ImageView  //展示繪制的手勢(shì)
  android:id="@+id/save_dialog_iv"
  android:layout_width="match_parent"
  android:layout_height="match_parent" />
</LinearLayout>

1.4 代碼部分：

package com.example.mygesture.addgesture;
import android.Manifest;
import android.content.DialogInterface;
import android.content.Intent;
import android.content.pm.PackageManager;
import android.gesture.Gesture;
import android.gesture.GestureLibraries;
import android.gesture.GestureLibrary;
import android.gesture.GestureOverlayView;
import android.graphics.Bitmap;
import android.graphics.Color;
import android.support.v4.app.ActivityCompat;
import android.support.v7.app.AlertDialog;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.view.View;
import android.widget.EditText;
import android.widget.ImageView;
import android.widget.Toast;
import com.example.mygesture.R;
import com.example.mygesture.recognitiongesture.Main4Activity;
public class Main3Activity extends AppCompatActivity {
 GestureOverlayView gov;   //定義繪制組件
 @Override
 protected void onCreate(Bundle savedInstanceState) {
  super.onCreate(savedInstanceState);
  setContentView(R.layout.activity_main3);
  if (ActivityCompat.checkSelfPermission(this, Manifest.permission.READ_EXTERNAL_STORAGE) != PackageManager.PERMISSION_GRANTED) {
   ActivityCompat.requestPermissions(this, new String[]{Manifest.permission.READ_EXTERNAL_STORAGE, Manifest.permission.WRITE_EXTERNAL_STORAGE}, 1);  
  }    //高版本需要?jiǎng)討B(tài)申請(qǐng)權(quán)限
  init();
 }
 private void init() {
  gov = findViewById(R.id.activity_main3_gov);
//  gov.setGestureColor(Color.RED);  //設(shè)置繪制的顏色
  gov.setGestureStrokeWidth(4);  //設(shè)置畫(huà)筆的寬度
  gov.addOnGesturePerformedListener(new GestureOverlayView.OnGesturePerformedListener() { //設(shè)置繪制完成監(jiān)聽(tīng)
   @Override
   public void onGesturePerformed(GestureOverlayView overlay, final Gesture gesture) {
    View saveDialog = getLayoutInflater().inflate(R.layout.save_dialog, null); //獲取AlertDialog的布局樣式
    final EditText editText = saveDialog.findViewById(R.id.save_dialog_et);
    ImageView imageView = saveDialog.findViewById(R.id.save_dialog_iv);
    Bitmap bitmap = gesture.toBitmap(128, 128, 10, 0xFFFF0000);  //將手勢(shì)轉(zhuǎn)換為位圖
    imageView.setImageBitmap(bitmap);   //用ImageView加載手勢(shì)圖片
    new AlertDialog.Builder(Main3Activity.this).setView(saveDialog).setPositiveButton("確定", new DialogInterface.OnClickListener() {
     @Override
     public void onClick(DialogInterface dialog, int which) {
      GestureLibrary gestureLibrary = GestureLibraries.fromFile("/mnt/sdcard/mygesture");//利用手勢(shì)庫(kù)獲取存放手勢(shì)文件的地址
      gestureLibrary.addGesture(editText.getText().toString(), gesture);  //向手勢(shì)庫(kù)中添加手勢(shì)名稱(chēng)和手勢(shì)
      gestureLibrary.save();    //保存手勢(shì)庫(kù)
      Toast.makeText(Main3Activity.this, "保存成功", Toast.LENGTH_SHORT).show();
     }
    }).setNegativeButton("取消", null)
      .show();
   }
  });
 }
 public void recognition(View view) {
  Intent intent = new Intent(this, Main4Activity.class);
  startActivity(intent);
 }
}

2. 接下來(lái)完成識(shí)別手勢(shì)的Activity：

2.1 一樣的先寫(xiě)布局文件

<?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"
 android:orientation="vertical"
 tools:context=".recognitiongesture.Main4Activity">

 <TextView
  android:layout_width="match_parent"
  android:layout_height="wrap_content"
  android:gravity="center"
  android:text="請(qǐng)繪制需要識(shí)別的手勢(shì)" />

 <android.gesture.GestureOverlayView
  android:id="@+id/activity_main4_gov"
  android:layout_width="match_parent"
  android:layout_height="match_parent"></android.gesture.GestureOverlayView>
</LinearLayout>

2.2 代碼的編寫(xiě)

package com.example.mygesture.recognitiongesture;
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.AlertDialog;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.widget.ArrayAdapter;
import android.widget.Toast;
import com.example.mygesture.R;
import java.util.ArrayList;
import java.util.logging.Level;
public class Main4Activity extends AppCompatActivity {
 GestureOverlayView gov;
 GestureLibrary gestureLibrary;  //定義手勢(shì)庫(kù)
 @Override
 protected void onCreate(Bundle savedInstanceState) {
  super.onCreate(savedInstanceState);
  setContentView(R.layout.activity_main4);
  init();
 }
 private void init() {
  gestureLibrary = GestureLibraries.fromFile("/mnt/sdcard/mygesture"); //獲取手勢(shì)文件
  if (gestureLibrary.load()) {   //判斷手勢(shì)文件是否存在以及加載
   Toast.makeText(this, "手勢(shì)文件加載成功", Toast.LENGTH_SHORT).show();
  } else {
   Toast.makeText(this, "手勢(shì)文件加載失敗", Toast.LENGTH_SHORT).show();
  }
  gov = findViewById(R.id.activity_main4_gov);
  gov.addOnGesturePerformedListener(new GestureOverlayView.OnGesturePerformedListener() {
   @Override
   public void onGesturePerformed(GestureOverlayView overlay, Gesture gesture) {
    ArrayList<Prediction> predictions = gestureLibrary.recognize(gesture); //匹配手勢(shì)庫(kù)中的所有手勢(shì)
    ArrayList<String> result = new ArrayList<>();  //匹配結(jié)果數(shù)組
    for (Prediction pred : predictions) {
     if (pred.score > 2) {    //匹配手勢(shì)庫(kù)中的所有手勢(shì)，并將相似度>2存入匹配結(jié)果數(shù)組
      result.add("相似度：" + pred.score);
     }
    }
    if (result.size() > 0) {  //這里用了適配器來(lái)作為AlertDialog的布局樣式，用于顯示所有手勢(shì)的相似度
     ArrayAdapter<Object> arrayAdapter = new ArrayAdapter<Object>(Main4Activity.this, android.R.layout.simple_dropdown_item_1line, result.toArray());
     new AlertDialog.Builder(Main4Activity.this).setAdapter(arrayAdapter, null).setPositiveButton("確定", null).show();
    } else {
     Toast.makeText(Main4Activity.this, "未找到與之匹配的手勢(shì)", Toast.LENGTH_SHORT).show();
    }
   }
  });
 }
}

總結(jié)

以上所述是小編給大家介紹的Android實(shí)現(xiàn)自定義手勢(shì)和識(shí)別手勢(shì)的功能,希望對(duì)大家有所幫助，如果大家有任何疑問(wèn)請(qǐng)給我留言，小編會(huì)及時(shí)回復(fù)大家的。在此也非常感謝大家對(duì)腳本之家網(wǎng)站的支持！
如果你覺(jué)得本文對(duì)你有幫助，歡迎轉(zhuǎn)載，煩請(qǐng)注明出處，謝謝！

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