android多屏触摸相关的详解方案-安卓framework开发手机车载车机系统开发课程

背景

直播免费视频课程地址：https://www.bilibili.com/video/BV1hN4y1R7t2/

在做双屏相关需求开发过程中，经常会有对两个屏幕都要求可以正确触摸的场景。但是目前我们模拟器默认创建的双屏其实是没有办法进行触摸的

修改方案1

静态修改方案

使用命令查看display2即副屏的信息情况

adb shell dumpsys display

bash 复制代码

  Display 2:
    mDisplayId=2
    mPhase=1
    mLayerStack=2
    mHasContent=true
    mDesiredDisplayModeSpecs={baseModeId=2 allowGroupSwitching=false primaryRefreshRateRange=[0 Infinity] appRequestRefreshRateRange=[0 Infinity]}
    mRequestedColorMode=0
    mDisplayOffset=(0, 0)
    mDisplayScalingDisabled=false
    mPrimaryDisplayDevice=HDMI Screen
    mBaseDisplayInfo=DisplayInfo{"HDMI Screen", displayId 2", displayGroupId 0, FLAG_SECURE, FLAG_SUPPORTS_PROTECTED_BUFFERS, FLAG_PRESENTATION, FLAG_TRUSTED, real 1440 x 2960, largest app 1440 x 2960, smallest app 1440 x 2960, appVsyncOff 2000000, presDeadline 75, mode 2, defaultMode 2, modes [{id=2, width=1440, height=2960, fps=1.3333333E7, alternativeRefreshRates=[]}], hdrCapabilities HdrCapabilities{mSupportedHdrTypes=[], mMaxLuminance=500.0, mMaxAverageLuminance=500.0, mMinLuminance=0.0}, userDisabledHdrTypes [], minimalPostProcessingSupported false, rotation 0, state ON, type EXTERNAL, uniqueId "local:4619827551948147201", app 1440 x 2960, density 560 (215152.0 x 214811.02) dpi, layerStack 2, colorMode 0, supportedColorModes [0], address {port=1, model=0x401cecae7d6e8a}, deviceProductInfo DeviceProductInfo{name=EMU_display_1, manufacturerPnpId=GGL, productId=4660, modelYear=null, manufactureDate=ManufactureDate{week=12, year=2021}, connectionToSinkType=0}, removeMode 0, refreshRateOverride 0.0, brightnessMinimum 0.0, brightnessMaximum 1.0, brightnessDefault 0.5, installOrientation ROTATION_0}

这里主要看对应的uniqueId "local:4619827551948147201"

然后结合input中需要这个uniqueId，更新地方：

bash 复制代码

2: virtio_input_multi_touch_7
      Classes: TOUCH | TOUCH_MT | SWITCH
      Path: /dev/input/event8
      Enabled: true
      Descriptor: e1c836c7be888adb29ca6646292e486f96461e97
      Location: virtio17/input0
      ControllerNumber: 0
      UniqueId: 
      Identifier: bus=0x0006, vendor=0x0000, product=0x0000, version=0x0000
      KeyLayoutFile: 
      KeyCharacterMapFile: 
      ConfigurationFile: /vendor/usr/idc/virtio_input_multi_touch_7.idc
      VideoDevice: <none>

就是这个 ConfigurationFile: /vendor/usr/idc/virtio_input_multi_touch_7.idc

去源码的out路径下修改/aosp/out/target/product/emulator_x86_64/vendor/usr/idc/virtio_input_multi_touch_7.idc

主要把touch.displayId 变成上面的获取的local:4619827551948147201

bash 复制代码

device.internal = 1

touch.deviceType = touchScreen
touch.orientationAware = 1

cursor.mode = navigation
cursor.orientationAware = 1

# This displayID matches the unique ID of the virtual display created for Emulator.
# This will indicate to input flinger than it should link this input device
# with the virtual display.
touch.displayId = local:4619827551948147201

再进行整体编译即可以

修改方案2

动态修改方案

思路通过调用input中相关方法对config进行相关修改

对应方法如下：

即只需要通过这个方法即可以指定触摸的input ---》对应显示display进行映射

注意这里使用是port阿，不是displayId

port也可以通过dumpsys display查看哈：

在对应的address有对于的port值，一般就是第一个屏幕0，第二屏幕1

bash 复制代码

address {port=1, model=0x401cecae7d6e8a}, deviceProductInfo DeviceProductInfo{name=EMU_display_1, manufacturerPnpId=GGL, productId=4660, modelYear=null, manufactureDate=ManufactureDate{week=12, year=2021}

确定了了display的port还有一个input相关inputPort参数，这个就直接通过dumpsy input获取哈，在dumpsys寻找对应屏幕的event，从而找到对应的Device

bash 复制代码

 2: virtio_input_multi_touch_7
      Classes: TOUCH | TOUCH_MT | SWITCH
      Path: /dev/input/event8
      Enabled: true
      Descriptor: e1c836c7be888adb29ca6646292e486f96461e97
      Location: virtio17/input0
      ControllerNumber: 0
      UniqueId: 
      Identifier: bus=0x0006, vendor=0x0000, product=0x0000, version=0x0000
      KeyLayoutFile: 
      KeyCharacterMapFile: 
      ConfigurationFile: /vendor/usr/idc/virtio_input_multi_touch_7.idc
      VideoDevice: <none>

就是这里的 Location: virtio17/input0，virtio17/input0就是我们要的

做好一个动态调用触发，这里直接也使用dumpsys input命令里面进行：

bash 复制代码

commit 72193cfb966307940457148bedc793c316d67af5 (HEAD)
Author: Your Name <[email protected]>
Date:   Fri Aug 25 17:23:22 2023 +0800

    add displayfortouch modify

diff --git a/services/core/java/com/android/server/input/InputManagerService.java b/services/core/java/com/android/server/input/InputManagerService.java
index 72612a0468cd..587a7b313b8f 100644
--- a/services/core/java/com/android/server/input/InputManagerService.java
+++ b/services/core/java/com/android/server/input/InputManagerService.java
@@ -2678,6 +2678,14 @@ public class InputManagerService extends IInputManager.Stub
         if (!DumpUtils.checkDumpPermission(mContext, TAG, pw)) return;
 
         pw.println("INPUT MANAGER (dumpsys input)\n");
+        pw.println("INPUT MANAGER args size = "+args.length + "\n");
+        if (args.length == 3 && args[0].equals("displayForInput")) {
+            String location = args[1];
+            int port = Integer.parseInt(args[2]);
+            addPortAssociation(location,port);
+            pw.println("INPUT MANAGER addPortAssociation location= "+location +" port = " +port+ " \n");
+            return;
+        }
         String dumpStr = mNative.dump();
         if (dumpStr != null) {
             pw.println(dumpStr);

最后使用命令：

adb shell dumpsys input displayForInput virtio17/input0 1