Android Studio 基础之模拟 Home / 音量 + - 加减键按下（扩展到模拟常用的各个物理按键）的操作

￡神魔★判官ぃ 2023-02-16 01:41 2阅读 0赞

![20200606094432916.png][]

# Android Studio 基础 之 模拟 Home / 音量 + - 加减键按下（扩展到模拟常用的各个物理按键）的操作 #

**目录**

Android Studio 基础 之 模拟 Home / 音量 + - 加减键按下

一、简单介绍

二、实现原理

三、注意实现

四、效果预览

五、实现步骤

六、关键代码

七、扩展到模拟各个物理按键的代码

八、常用的按键keyCode

--------------------

## 一、简单介绍 ##

Android 开发中的一些基础操作，使用整理，便于后期使用。

本节介绍，模拟 Home / 音量 + - 加减键按下的操作。

## 二、实现原理 ##

1、音量加减+-键，使用 Runtime  和 Process （Process proc = runtime.exec(keyCommand)）实现

2、Home 键，使用意图 intent 的方式实现

3、模拟 adb shell input key keynumber，来实现各个物理按键

## 三、注意实现 ##

1、要点击实现音量真正的加减效果，请在音量调出现的时候，继续按下音量加减，音量就会真正的增加减少

2、代码模拟其他物理按键输入，这里用了shell 命令在程序运行时环境里模拟按键事件。因命令执行会阻塞线程， 所以最好是在子线程里执行命令

## 四、效果预览 ##

![watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3UwMTQzNjEyODA_size_16_color_FFFFFF_t_70][]![watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3UwMTQzNjEyODA_size_16_color_FFFFFF_t_70 1][]![watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3UwMTQzNjEyODA_size_16_color_FFFFFF_t_70 2][]

## 五、实现步骤 ##

1、打开 Android Studio ，新建工程

![watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3UwMTQzNjEyODA_size_16_color_FFFFFF_t_70 3][]

2、取个名称

![watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3UwMTQzNjEyODA_size_16_color_FFFFFF_t_70 4][]

3、新建一个 EmptyActivity

![watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3UwMTQzNjEyODA_size_16_color_FFFFFF_t_70 5][]

4、完成，新建工程

![watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3UwMTQzNjEyODA_size_16_color_FFFFFF_t_70 6][]

5、编写脚本，实现模拟音量加减 / 和Home 键的功能

![watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3UwMTQzNjEyODA_size_16_color_FFFFFF_t_70 7][]

6、布置一下 layout，测试接口

![watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3UwMTQzNjEyODA_size_16_color_FFFFFF_t_70 8][]

7、打包运行应用，效果如上

## 六、关键代码 ##

1、MainActivity.java

2、activity\_main.xml

<?xml version="1.0" encoding="utf-8"?>
 <android.support.constraint.ConstraintLayout 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">
 
 <Button
 android:id="@+id/button"
 android:layout_width="wrap_content"
 android:layout_height="wrap_content"
 android:layout_marginStart="120dp"
 android:layout_marginTop="84dp"
 android:onClick="onVolumeAddKeyclick"
 android:text="模拟音量+"
 app:layout_constraintStart_toStartOf="parent"
 app:layout_constraintTop_toTopOf="parent" />
 
 <Button
 android:id="@+id/button2"
 android:layout_width="wrap_content"
 android:layout_height="wrap_content"
 android:layout_marginStart="120dp"
 android:layout_marginTop="176dp"
 android:onClick="onVolumeReduceKeyclick"
 android:text="模拟音量-"
 app:layout_constraintStart_toStartOf="parent"
 app:layout_constraintTop_toTopOf="parent" />
 
 <Button
 android:id="@+id/button3"
 android:layout_width="wrap_content"
 android:layout_height="wrap_content"
 android:layout_marginStart="120dp"
 android:layout_marginTop="280dp"
 android:onClick="onHomeKeyclick"
 android:text="模拟Home键"
 app:layout_constraintStart_toStartOf="parent"
 app:layout_constraintTop_toTopOf="parent" />
 
 </android.support.constraint.ConstraintLayout>

## 七、扩展到模拟各个物理按键的代码 ##

package com.example.administrator.simulatevolumekey;
    
    import android.content.Intent;
    import android.support.v7.app.AppCompatActivity;
    import android.os.Bundle;
    import android.util.Log;
    import android.view.KeyEvent;
    import android.view.View;
    
    import java.io.BufferedReader;
    import java.io.IOException;
    import java.io.InputStreamReader;
    
    public class MainActivity extends AppCompatActivity {
    
        private static final String TAG = MainActivity.class.getSimpleName();
    
        @Override
        protected void onCreate(Bundle savedInstanceState) {
            super.onCreate(savedInstanceState);
            setContentView(R.layout.activity_main);
        }
    
    
        public void onVolumeAddKeyclick(View view) {
    
            // 模拟音量+
            //OnVolumeAddKey();
    
            keyVolumeAdd();
        }
    
        public void onVolumeReduceKeyclick(View view) {
    
            // 模拟音量-
            OnVolumeReduceKey();
    
        }
    
        public void onHomeKeyclick(View view) {
    
            // 模拟 Home 键
            OnHomeKey();
    
        }
    
    
        /**
         * 模拟音量加减按下
         */
        public void OnVolumeAddKey(){
    
            try
            {
                String keyCommand = "input keyevent " + KeyEvent.KEYCODE_VOLUME_UP;
                Runtime runtime = Runtime.getRuntime();
                Process proc = runtime.exec(keyCommand);
    
                Log.i(TAG, "OnVolumeAddKey: 音量加按下");
            }
            catch (IOException e)
            {
                // TODO Auto-generated catch block
                e.printStackTrace();
            }
    
        }
    
        /**
         * 模拟音量减键按下
         */
        public void OnVolumeReduceKey(){
    
            try
            {
                String keyCommand = "input keyevent " + KeyEvent.KEYCODE_VOLUME_DOWN;
                Runtime runtime = Runtime.getRuntime();
                Process proc = runtime.exec(keyCommand);
    
                Log.i(TAG, "OnVolumeAddKey: 音量减按下");
            }
            catch (IOException e)
            {
                // TODO Auto-generated catch block
                e.printStackTrace();
            }
    
        }
    
        /**
         * 模拟Home 键
         */
        public void OnHomeKey(){
    
            Intent intent = new Intent(Intent.ACTION_MAIN);
            intent.setFlags(Intent.FLAG_ACTIVITY_NEW_TASK);//提示如果是服务里调用，必须加入new task标识
            intent.addCategory(Intent.CATEGORY_HOME);
            startActivity(intent);
    
        }
    
        /**
         * adb shell 命令 模拟音量键+
         */
        public void keyVolumeAdd(){
    
            new Thread(){
                @Override
                public void run() {
                    execByRuntime("input keyevent 24");
                }
            }.start();
    
        }
    
        /**
         * 执行shell 命令， 命令中不必再带 adb shell
         *
         * @param cmd
         * @return Sting  命令执行在控制台输出的结果
         */
        public static String execByRuntime(String cmd) {
            Process process = null;
            BufferedReader bufferedReader = null;
            InputStreamReader inputStreamReader = null;
            try {
                process = Runtime.getRuntime().exec(cmd);
                inputStreamReader = new InputStreamReader(process.getInputStream());
                bufferedReader = new BufferedReader(inputStreamReader);
    
                int read;
                char[] buffer = new char[4096];
                StringBuilder output = new StringBuilder();
                while ((read = bufferedReader.read(buffer)) > 0) {
                    output.append(buffer, 0, read);
                }
                return output.toString();
            } catch (Exception e) {
                e.printStackTrace();
                return null;
            } finally {
                if (null != inputStreamReader) {
                    try {
                        inputStreamReader.close();
                    } catch (Throwable t) {
                        //
                    }
                }
                if (null != bufferedReader) {
                    try {
                        bufferedReader.close();
                    } catch (Throwable t) {
                        //
                    }
                }
                if (null != process) {
                    try {
                        process.destroy();
                    } catch (Throwable t) {
                        //
                    }
                }
            }
        }
    
    }

## 八、常用的按键keyCode ##

<table style="width:500pt;"> 
 <tbody> 
 <tr> 
 <td style="border-color:#000000;vertical-align:middle;width:132.75pt;">键英文名</td> 
 <td style="border-color:#000000;vertical-align:middle;width:84pt;">键中文名</td> 
 <td style="border-color:#000000;vertical-align:middle;width:54pt;">Keycode</td> 
 </tr> 
 <tr> 
 <td style="border-color:#000000;vertical-align:middle;">KEYCODE_CALL&nbsp;</td> 
 <td style="border-color:#000000;vertical-align:middle;">拨号键&nbsp;</td> 
 <td style="border-color:#000000;vertical-align:middle;">5</td> 
 </tr> 
 <tr> 
 <td style="border-color:#000000;vertical-align:middle;">KEYCODE_ENDCALL&nbsp;</td> 
 <td style="border-color:#000000;vertical-align:middle;">挂机键&nbsp;</td> 
 <td style="border-color:#000000;vertical-align:middle;">6</td> 
 </tr> 
 <tr> 
 <td style="border-color:#000000;vertical-align:middle;">KEYCODE_HOME&nbsp;</td> 
 <td style="border-color:#000000;vertical-align:middle;">按键Home&nbsp;</td> 
 <td style="border-color:#000000;vertical-align:middle;">3</td> 
 </tr> 
 <tr> 
 <td style="border-color:#000000;vertical-align:middle;">KEYCODE_MENU&nbsp;</td> 
 <td style="border-color:#000000;vertical-align:middle;">菜单键&nbsp;</td> 
 <td style="border-color:#000000;vertical-align:middle;">82</td> 
 </tr> 
 <tr> 
 <td style="border-color:#000000;vertical-align:middle;">KEYCODE_BACK&nbsp;</td> 
 <td style="border-color:#000000;vertical-align:middle;">返回键&nbsp;</td> 
 <td style="border-color:#000000;vertical-align:middle;">4</td> 
 </tr> 
 <tr> 
 <td style="border-color:#000000;vertical-align:middle;">KEYCODE_SEARCH&nbsp;</td> 
 <td style="border-color:#000000;vertical-align:middle;">搜索键&nbsp;</td> 
 <td style="border-color:#000000;vertical-align:middle;">84</td> 
 </tr> 
 <tr> 
 <td style="border-color:#000000;vertical-align:middle;">KEYCODE_CAMERA&nbsp;</td> 
 <td style="border-color:#000000;vertical-align:middle;">拍照键&nbsp;</td> 
 <td style="border-color:#000000;vertical-align:middle;">27</td> 
 </tr> 
 <tr> 
 <td style="border-color:#000000;vertical-align:middle;">KEYCODE_FOCUS&nbsp;</td> 
 <td style="border-color:#000000;vertical-align:middle;">拍照对焦键&nbsp;</td> 
 <td style="border-color:#000000;vertical-align:middle;">80</td> 
 </tr> 
 <tr> 
 <td style="border-color:#000000;vertical-align:middle;">KEYCODE_POWER&nbsp;</td> 
 <td style="border-color:#000000;vertical-align:middle;">电源键&nbsp;</td> 
 <td style="border-color:#000000;vertical-align:middle;">26</td> 
 </tr> 
 <tr> 
 <td style="border-color:#000000;vertical-align:middle;">KEYCODE_NOTIFICATION&nbsp;</td> 
 <td style="border-color:#000000;vertical-align:middle;">通知键&nbsp;</td> 
 <td style="border-color:#000000;vertical-align:middle;">83</td> 
 </tr> 
 <tr> 
 <td style="border-color:#000000;vertical-align:middle;">KEYCODE_MUTE&nbsp;</td> 
 <td style="border-color:#000000;vertical-align:middle;">话筒静音键&nbsp;</td> 
 <td style="border-color:#000000;vertical-align:middle;">91</td> 
 </tr> 
 <tr> 
 <td style="border-color:#000000;vertical-align:middle;">KEYCODE_VOLUME_MUTE&nbsp;</td> 
 <td style="border-color:#000000;vertical-align:middle;">扬声器静音键&nbsp;</td> 
 <td style="border-color:#000000;vertical-align:middle;">164</td> 
 </tr> 
 <tr> 
 <td style="border-color:#000000;vertical-align:middle;">KEYCODE_VOLUME_UP&nbsp;</td> 
 <td style="border-color:#000000;vertical-align:middle;">音量增加键&nbsp;</td> 
 <td style="border-color:#000000;vertical-align:middle;">24</td> 
 </tr> 
 <tr> 
 <td style="border-color:#000000;vertical-align:middle;">KEYCODE_VOLUME_DOWN&nbsp;</td> 
 <td style="border-color:#000000;vertical-align:middle;">音量减小键&nbsp;</td> 
 <td style="border-color:#000000;vertical-align:middle;">25</td> 
 </tr> 
 <tr> 
 <td style="border-color:#000000;vertical-align:middle;">KEYCODE_ENTER&nbsp;</td> 
 <td style="border-color:#000000;vertical-align:middle;">回车键&nbsp;</td> 
 <td style="border-color:#000000;vertical-align:middle;">66</td> 
 </tr> 
 <tr> 
 <td style="border-color:#000000;vertical-align:middle;">KEYCODE_ESCAPE&nbsp;</td> 
 <td style="border-color:#000000;vertical-align:middle;">ESC键&nbsp;</td> 
 <td style="border-color:#000000;vertical-align:middle;">111</td> 
 </tr> 
 <tr> 
 <td style="border-color:#000000;vertical-align:middle;">KEYCODE_DPAD_CENTER&nbsp;</td> 
 <td style="border-color:#000000;vertical-align:middle;">导航键 确定键&nbsp;</td> 
 <td style="border-color:#000000;vertical-align:middle;">23</td> 
 </tr> 
 <tr> 
 <td style="border-color:#000000;vertical-align:middle;">KEYCODE_DPAD_UP&nbsp;</td> 
 <td style="border-color:#000000;vertical-align:middle;">导航键 向上&nbsp;</td> 
 <td style="border-color:#000000;vertical-align:middle;">19</td> 
 </tr> 
 <tr> 
 <td style="border-color:#000000;vertical-align:middle;">KEYCODE_DPAD_DOWN&nbsp;</td> 
 <td style="border-color:#000000;vertical-align:middle;">导航键 向下&nbsp;</td> 
 <td style="border-color:#000000;vertical-align:middle;">20</td> 
 </tr> 
 <tr> 
 <td style="border-color:#000000;vertical-align:middle;">KEYCODE_DPAD_LEFT&nbsp;</td> 
 <td style="border-color:#000000;vertical-align:middle;">导航键 向左&nbsp;</td> 
 <td style="border-color:#000000;vertical-align:middle;">21</td> 
 </tr> 
 <tr> 
 <td style="border-color:#000000;vertical-align:middle;">KEYCODE_DPAD_RIGHT&nbsp;</td> 
 <td style="border-color:#000000;vertical-align:middle;">导航键 向右&nbsp;</td> 
 <td style="border-color:#000000;vertical-align:middle;">22</td> 
 </tr> 
 <tr> 
 <td style="border-color:#000000;vertical-align:middle;">KEYCODE_MOVE_HOME&nbsp;</td> 
 <td style="border-color:#000000;vertical-align:middle;">光标移动到开始键&nbsp;</td> 
 <td style="border-color:#000000;vertical-align:middle;">122</td> 
 </tr> 
 <tr> 
 <td style="border-color:#000000;vertical-align:middle;">KEYCODE_MOVE_END&nbsp;</td> 
 <td style="border-color:#000000;vertical-align:middle;">光标移动到末尾键&nbsp;</td> 
 <td style="border-color:#000000;vertical-align:middle;">123</td> 
 </tr> 
 <tr> 
 <td style="border-color:#000000;vertical-align:middle;">KEYCODE_PAGE_UP&nbsp;</td> 
 <td style="border-color:#000000;vertical-align:middle;">向上翻页键&nbsp;</td> 
 <td style="border-color:#000000;vertical-align:middle;">92</td> 
 </tr> 
 <tr> 
 <td style="border-color:#000000;vertical-align:middle;">KEYCODE_PAGE_DOWN&nbsp;</td> 
 <td style="border-color:#000000;vertical-align:middle;">向下翻页键&nbsp;</td> 
 <td style="border-color:#000000;vertical-align:middle;">93</td> 
 </tr> 
 <tr> 
 <td style="border-color:#000000;vertical-align:middle;">KEYCODE_DEL&nbsp;</td> 
 <td style="border-color:#000000;vertical-align:middle;">退格键&nbsp;</td> 
 <td style="border-color:#000000;vertical-align:middle;">67</td> 
 </tr> 
 <tr> 
 <td style="border-color:#000000;vertical-align:middle;">KEYCODE_FORWARD_DEL&nbsp;</td> 
 <td style="border-color:#000000;vertical-align:middle;">删除键&nbsp;</td> 
 <td style="border-color:#000000;vertical-align:middle;">112</td> 
 </tr> 
 <tr> 
 <td style="border-color:#000000;vertical-align:middle;">KEYCODE_INSERT&nbsp;</td> 
 <td style="border-color:#000000;vertical-align:middle;">插入键&nbsp;</td> 
 <td style="border-color:#000000;vertical-align:middle;">124</td> 
 </tr> 
 <tr> 
 <td style="border-color:#000000;vertical-align:middle;">KEYCODE_TAB&nbsp;</td> 
 <td style="border-color:#000000;vertical-align:middle;">Tab键&nbsp;</td> 
 <td style="border-color:#000000;vertical-align:middle;">61</td> 
 </tr> 
 <tr> 
 <td style="border-color:#000000;vertical-align:middle;">KEYCODE_NUM_LOCK&nbsp;</td> 
 <td style="border-color:#000000;vertical-align:middle;">小键盘锁&nbsp;</td> 
 <td style="border-color:#000000;vertical-align:middle;">143</td> 
 </tr> 
 <tr> 
 <td style="border-color:#000000;vertical-align:middle;">KEYCODE_CAPS_LOCK&nbsp;</td> 
 <td style="border-color:#000000;vertical-align:middle;">大写锁定键&nbsp;</td> 
 <td style="border-color:#000000;vertical-align:middle;">115</td> 
 </tr> 
 <tr> 
 <td style="border-color:#000000;vertical-align:middle;">KEYCODE_BREAK&nbsp;</td> 
 <td style="border-color:#000000;vertical-align:middle;">Break/Pause键&nbsp;</td> 
 <td style="border-color:#000000;vertical-align:middle;">121</td> 
 </tr> 
 <tr> 
 <td style="border-color:#000000;vertical-align:middle;">KEYCODE_SCROLL_LOCK&nbsp;</td> 
 <td style="border-color:#000000;vertical-align:middle;">滚动锁定键&nbsp;</td> 
 <td style="border-color:#000000;vertical-align:middle;">116</td> 
 </tr> 
 <tr> 
 <td style="border-color:#000000;vertical-align:middle;">KEYCODE_ZOOM_IN&nbsp;</td> 
 <td style="border-color:#000000;vertical-align:middle;">放大键&nbsp;</td> 
 <td style="border-color:#000000;vertical-align:middle;">168</td> 
 </tr> 
 <tr> 
 <td style="border-color:#000000;vertical-align:middle;">KEYCODE_ZOOM_OUT&nbsp;</td> 
 <td style="border-color:#000000;vertical-align:middle;">缩小键&nbsp;</td> 
 <td style="border-color:#000000;vertical-align:middle;">169</td> 
 </tr> 
 </tbody> 
</table>

![watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3UwMTQzNjEyODA_size_16_color_FFFFFF_t_70 9][]

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