游戏手柄按键遥杆值检测

前言

本章讲述游戏手柄按键遥感值检测

1 环境
as 4.1.*

2 代码
MainActivity.java

package com.example.testthooth1;import androidx.annotation.NonNull;
import androidx.annotation.Nullable;
import androidx.appcompat.app.AppCompatActivity;import android.os.Bundle;
import android.util.Log;
import android.view.InputDevice;
import android.view.KeyEvent;
import android.view.MotionEvent;
import android.view.TextureView;
import android.view.View;
import android.widget.TextView;import java.util.ArrayList;
import java.util.Collection;
import java.util.Iterator;
import java.util.List;
import java.util.ListIterator;public class MainActivity extends AppCompatActivity {private final  String TAG = MainActivity.class.getName() ;private TextView showtext ;private List<String> listshow ;//  private MutilTextView mutiltextview ;@Overrideprotected void onCreate(Bundle savedInstanceState) {super.onCreate(savedInstanceState);setContentView(R.layout.activity_main);showtext = (TextView)findViewById(R.id.showtext);listshow= new ArrayList<String>();}void showLog(String str){if(listshow.size() >= 50){listshow.remove(0);}listshow.add(str);showtext.setText(listshow.toString());}Dpad dpad = new Dpad();@Overridepublic boolean onGenericMotionEvent(MotionEvent event) {// Check that the event came from a game controllerif ((event.getSource() & InputDevice.SOURCE_JOYSTICK) ==InputDevice.SOURCE_JOYSTICK &&event.getAction() == MotionEvent.ACTION_MOVE) {// Process all historical movement samples in the batchfinal int historySize = event.getHistorySize();// Process the movements starting from the// earliest historical position in the batchfor (int i = 0; i < historySize; i++) {// Process the event at historical position iprocessJoystickInput(event, i);}// Process the current movement sample in the batch (position -1)processJoystickInput(event, -1);return true;}return super.onGenericMotionEvent(event);}@Overridepublic boolean dispatchKeyEvent(KeyEvent event) {if ((event.getSource() & InputDevice.SOURCE_GAMEPAD)== InputDevice.SOURCE_GAMEPAD){InputDevice mInputDevice = event.getDevice();String tcontext = "KeyEvent mInputDeviceid ="+mInputDevice.getId() +" KeyEvent="+event.getAction()+" keycode="+event.getKeyCode();Log.e(TAG,tcontext);showLog(tcontext);return  true;}return super.dispatchKeyEvent(event);}private void processJoystickInput(MotionEvent event,int historyPos) {InputDevice mInputDevice = event.getDevice();// Calculate the horizontal distance to move by// using the input value from one of these physical controls:// the left control stick, hat axis, or the right control stick.float x = getCenteredAxis(event, mInputDevice,MotionEvent.AXIS_X, historyPos);//左摇杆:float lx =  event.getAxisValue(MotionEvent.AXIS_X);float ly = event.getAxisValue(MotionEvent.AXIS_Y);//右摇杆float rx =  event.getAxisValue(MotionEvent.AXIS_Z);float ry = event.getAxisValue(MotionEvent.AXIS_RZ);//十字键float hx =  event.getAxisValue(MotionEvent.AXIS_HAT_X);float hy = event.getAxisValue(MotionEvent.AXIS_HAT_Y);int press = -1;if (Dpad.isDpadDevice(event)) {press = dpad.getDirectionPressed(event);//  Log.e(TAG,"Dpad="+press);switch (press) {case Dpad.LEFT:// Do something for LEFT direction pressbreak;case Dpad.RIGHT:// Do something for RIGHT direction pressbreak;case Dpad.UP:// Do something for UP direction pressbreak;case Dpad.CENTER:break;case Dpad.DOWN:break;}}if (x == 0) {x = getCenteredAxis(event, mInputDevice,MotionEvent.AXIS_HAT_X, historyPos);}if (x == 0) {x = getCenteredAxis(event, mInputDevice,MotionEvent.AXIS_Z, historyPos);}// Calculate the vertical distance to move by// using the input value from one of these physical controls:// the left control stick, hat switch, or the right control stick.float y = getCenteredAxis(event, mInputDevice,MotionEvent.AXIS_Y, historyPos);if (y == 0) {y = getCenteredAxis(event, mInputDevice,MotionEvent.AXIS_HAT_Y, historyPos);}if (y == 0) {y = getCenteredAxis(event, mInputDevice,MotionEvent.AXIS_RZ, historyPos);}// Update the ship object based on the new x and y values//" NEW X="+x+" new y="+y+String tcontext = "MotionEvent mInputDeviceid ="+mInputDevice.getId() +" press="+press+  " 左摇杆("+lx+","+ly+")右摇杆("+rx+","+ry+")"+" 十字键("+hx+"."+hy+")";Log.e(TAG,tcontext);showLog(tcontext);}private static float getCenteredAxis(MotionEvent event,InputDevice device, int axis, int historyPos) {final InputDevice.MotionRange range =device.getMotionRange(axis, event.getSource());// A joystick at rest does not always report an absolute position of// (0,0). Use the getFlat() method to determine the range of values// bounding the joystick axis center.if (range != null) {final float flat = range.getFlat();final float value =historyPos < 0 ? event.getAxisValue(axis):event.getHistoricalAxisValue(axis, historyPos);// Ignore axis values that are within the 'flat' region of the// joystick axis center.if (Math.abs(value) > flat) {return value;}}return 0;}public  void onClear(View v){showtext.setText("");listshow.clear();}
}/*
JAVA FLOAT或DOUBLE保留两位小数
2015-06-26 09:28:46  By: shinyuu
shinyuu Java开发实战 0 43395 4
不管是Java Web项目还是Android项目、很多时候都需要使用到保留两位小数问题、经过查找、本文将给出几种方案、大家可根据项目需要自己决定使用那种方法方案一、四舍五入
double f = 111231.5585;
BigDecimal b = new BigDecimal(f);
double f1 = b.setScale(2, BigDecimal.ROUND_HALF_UP).doubleValue();
//保留两位小数方案二、DECIMALFORMAT
1、用DecimalFormat 返回的是String格式的、该类对十进制进行全面的封装、像%号、千分位、小数精度、科学计算等float price=1.2;
//构造方法的字符格式这里如果小数不足2位,会以0补足
DecimalFormat decimalFormat = new DecimalFormat(".00");
//format 返回的是字符串
String p = decimalFomat.format(price);例：new DecimalFormat("#.00").format(3.1415926)#.00 表示两位小数 #.0000四位小数 以此类推...方案三、STRING.FORMAT
double d = 3.1415926;
String result = String.format("%.2f");*/

Dpad.java
抄自 Android官方培训课程

package com.example.testthooth1;import android.view.InputDevice;
import android.view.InputEvent;
import android.view.KeyEvent;
import android.view.MotionEvent;public class Dpad {final static int UP       = 0;final static int LEFT     = 1;final static int RIGHT    = 2;final static int DOWN     = 3;final static int CENTER   = 4;int directionPressed = -1; // initialized to -1public int getDirectionPressed(InputEvent event) {if (!isDpadDevice(event)) {return -1;}// If the input event is a MotionEvent, check its hat axis values.if (event instanceof MotionEvent) {// Use the hat axis value to find the D-pad directionMotionEvent motionEvent = (MotionEvent) event;float xaxis = motionEvent.getAxisValue(MotionEvent.AXIS_HAT_X);float yaxis = motionEvent.getAxisValue(MotionEvent.AXIS_HAT_Y);// Check if the AXIS_HAT_X value is -1 or 1, and set the D-pad// LEFT and RIGHT direction accordingly.if (Float.compare(xaxis, -1.0f) == 0) {directionPressed =  Dpad.LEFT;} else if (Float.compare(xaxis, 1.0f) == 0) {directionPressed =  Dpad.RIGHT;}// Check if the AXIS_HAT_Y value is -1 or 1, and set the D-pad// UP and DOWN direction accordingly.else if (Float.compare(yaxis, -1.0f) == 0) {directionPressed =  Dpad.UP;} else if (Float.compare(yaxis, 1.0f) == 0) {directionPressed =  Dpad.DOWN;}}// If the input event is a KeyEvent, check its key code.else if (event instanceof KeyEvent) {// Use the key code to find the D-pad direction.KeyEvent keyEvent = (KeyEvent) event;if (keyEvent.getKeyCode() == KeyEvent.KEYCODE_DPAD_LEFT) {directionPressed = Dpad.LEFT;} else if (keyEvent.getKeyCode() == KeyEvent.KEYCODE_DPAD_RIGHT) {directionPressed = Dpad.RIGHT;} else if (keyEvent.getKeyCode() == KeyEvent.KEYCODE_DPAD_UP) {directionPressed = Dpad.UP;} else if (keyEvent.getKeyCode() == KeyEvent.KEYCODE_DPAD_DOWN) {directionPressed = Dpad.DOWN;} else if (keyEvent.getKeyCode() == KeyEvent.KEYCODE_DPAD_CENTER) {directionPressed = Dpad.CENTER;}}return directionPressed;}public static boolean isDpadDevice(InputEvent event) {// Check that input comes from a device with directional pads.if ((event.getSource() & InputDevice.SOURCE_DPAD)!= InputDevice.SOURCE_DPAD) {return true;} else {return false;}}
}

activity_main.xml

<?xml version="1.0" encoding="utf-8"?>
<androidx.constraintlayout.widget.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"><TextViewandroid:id="@+id/showtext"android:layout_width="wrap_content"android:layout_height="wrap_content"android:text="Hello World!"android:lines="50"android:ellipsize="end"app:layout_constraintBottom_toBottomOf="parent"app:layout_constraintLeft_toLeftOf="parent"app:layout_constraintRight_toRightOf="parent"app:layout_constraintTop_toTopOf="parent" /><Buttonandroid:id="@+id/clear"android:layout_width="wrap_content"android:layout_height="wrap_content"app:layout_constraintBaseline_toBaselineOf="@id/showtext"android:text="清理"android:onClick= "onClear"android:layout_marginLeft="8dp"/></androidx.constraintlayout.widget.ConstraintLayout>

3 说明
左右遥杆十字键取值

DPAD 具体取值 DPAD 可能是 key 也可能是 motion

4 demo工程
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游戏手柄按键遥杆值检测

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