第二节

2024-06-02 04:39| 来源: 网络整理| 查看: 265

hi,粉丝朋友们！上一节已经对车载的多屏互动进行了相关的技术方案介绍，以及相关的核心方法 moveRootTaskToDisplay的讲解和使用。具体可以参考链接：https://blog.csdn.net/learnframework/article/details/130461689 本节就来进行代码实战

1、方案设计

要实现双屏互动，主要就只需要两个步骤： 1、手指动作识别 2、识别动作后触发寻找display，获取顶部task，触发moveTask操作在这里插入图片描述

2、手势动作识别部分

触发手势设计：因为模拟器实现条件有限，所以这里采用是双指向右移动一定距离触发。首先要进行对手指全局移动的监听，针对多个手指的触摸移动动作要进行识别。代码实现：单独建立一个PointerEventListener的实现子类叫做DoubleScreenMovePointerEventListener，在这里面的onPointerEvent方法即可以实现对应的触摸动作识别，这里实现是双指同时滑动触摸方式：

diff --git a/services/core/java/com/android/server/wm/DoubleScreenMovePointerEventListener.java b/services/core/java/com/android/server/wm/DoubleScreenMovePointerEventListener.java new file mode 100644 index 000000000000..f9c765476d19 --- /dev/null +++ b/services/core/java/com/android/server/wm/DoubleScreenMovePointerEventListener.java @@ -0,0 +1,62 @@ +package com.android.server.wm; + +import android.view.MotionEvent; +import android.view.WindowManagerPolicyConstants; + +public class DoubleScreenMovePointerEventListener implements WindowManagerPolicyConstants.PointerEventListener { + boolean shouldBeginMove = false; + int mPoint0FirstX = 0; + int mPoint1FirstX = 0; + + int mPoint0LastX = 0; + int mPoint1LastX = 0; + int START_GAP = 20;//动作触发阈值，最少移动为20个像素才可以 + private final WindowManagerService mService; + + public DoubleScreenMovePointerEventListener(WindowManagerService mService, DisplayContent mDisplayContent) { + this.mService = mService; + this.mDisplayContent = mDisplayContent; + } + + private final DisplayContent mDisplayContent; + + @Override + public void onPointerEvent(MotionEvent motionEvent) { + android.util.Log.i("DoubleScreenTouch","DoubleScreenMovePointerEventListener onPointerEvent motionEvent = "+motionEvent); + switch (motionEvent.getActionMasked()) { + case MotionEvent.ACTION_DOWN: + case MotionEvent.ACTION_POINTER_DOWN: + if (motionEvent.getPointerCount() > 2) { + shouldBeginMove = false; + android.util.Log.i("DoubleScreen","DoubleScreenMovePointerEventListener motionEvent.getPointerCount() > 2 end DoubleScreenMove "); + } + if (motionEvent.getPointerCount() == 2) { + if (mPoint0FirstX == 0 && mPoint1FirstX == 0) { + mPoint0FirstX = (int)motionEvent.getX(0); + mPoint1FirstX = (int)motionEvent.getX(1); + } + } + break; + case MotionEvent.ACTION_MOVE: + if (motionEvent.getPointerCount() == 2) { + if (!shouldBeginMove && motionEvent.getX(0) - mPoint0FirstX > START_GAP && + motionEvent.getX(1) - mPoint1FirstX > START_GAP) { //识别了双指动作达到触发task移动条件，则调用对应mDisplayContent.doTestMoveTaskToOtherDisplay方法 + android.util.Log.i("DoubleScreen","DoubleScreenMovePointerEventListener start DoubleScreenMove "); + shouldBeginMove = true; + mDisplayContent.doTestMoveTaskToOtherDisplay(); + } + + mPoint0LastX = (int)motionEvent.getX(0); + mPoint1LastX = (int)motionEvent.getX(1); + } + break; + case MotionEvent.ACTION_POINTER_UP: + case MotionEvent.ACTION_UP: + shouldBeginMove = false; + mPoint0FirstX = mPoint1FirstX =0; + android.util.Log.i("DoubleScreen","DoubleScreenMovePointerEventListener ACTION_UP end DoubleScreenMove "); + break; + } + } + +}

同时不要忘记需要把这个PointEventListener让displaycontent注册监听：

@@ -1063,7 +1085,9 @@ class DisplayContent extends RootDisplayArea implements WindowManagerPolicy.Disp // 1. All physical displays (multi-display). // 2. VirtualDisplays on VR, AA (and everything else). mTapDetector = new TaskTapPointerEventListener(mWmService, this);//需要传递WMS和DisplayContent方便调用 + mDoubleScreenMoveListener = new DoubleScreenMovePointerEventListener(mWmService, this); registerPointerEventListener(mTapDetector); + registerPointerEventListener(mDoubleScreenMoveListener); registerPointerEventListener(mWmService.mMousePositionTracker); if (mWmService.mAtmService.getRecentTasks() != null) { registerPointerEventListener(

3、寻找当前Display的Task，移动到目标display 触摸动作识别后会调用DisplayContent的doTestMoveTaskToOtherDisplay方法来完成剩下的业务： 1、获取要移动到的目标display对象 2、获取当前display要移动的Task对象 3、调用RootWindowContainer的moveRootTaskToDisplay方法来实现

+//add by doublescreenmove + public void doTestMoveTaskToOtherDisplay() { + DisplayContent otherDisplay = null; + if (mRootWindowContainer.getChildCount() == 2) {//检测是不是双屏 + otherDisplay = (mRootWindowContainer.getChildAt(0) == this) ? mRootWindowContainer.getChildAt(1):mRootWindowContainer.getChildAt(0);//获取另一个屏幕的DisplayContent + } + if (otherDisplay!= this && otherDisplay!= null) { + int rootTaskId = 0; + try { + Task rootTask = getTopRootTask();//获取当前display的顶部Task + if (rootTask.isActivityTypeHome()) {//home类型的task不支持移动 + android.util.Log.i("DoubleScreen","doTestMoveTaskToOtherDisplay isActivityTypeHome"); + return; + } + rootTaskId =rootTask.mTaskId; + mRootWindowContainer.moveRootTaskToDisplay(rootTaskId,otherDisplay.mDisplayId,true);//把task移动到另一屏 + }catch (Exception e) { + android.util.Log.i("DoubleScreen","doTestMoveTaskToOtherDisplay Exception",e); + } + } + } + //end by doublescreenmove

成果展示：在这里插入图片描述

模拟器调试要点：

这个部分请关注bibili的视频 https://www.bilibili.com/video/BV1Tv4y1J7eb

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