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为什么 android 认为我正在制作多点触控事件？

[英]Why android think that I am producing a multi-touch event?

 原文  2021-03-04 19:02:56  3   2    android/ multi-touch/ motionevent

问题描述

给定：视图 A，它持有视图 B。

我的布局

动作：我正在用手指 1 对视图 A 执行触摸并按住，然后用手指 2 在视图 B 上执行触摸并按住。然后释放和相同的操作，但首先是视图 B，然后是视图 A。我希望视图会收到类似的事件两种情况。

发生了什么：当我用手指 1 触摸并按住 A，然后用手指 2 触摸并按住 B 时，A 和 B 正在接收两个单独的 MotionEvent，它们每个都为一个指针保存 ACTION_MOVE 坐标：

日志猫：

-----first finger down on view A-------
    ACTION_DOWN[#0 (pid 0)=897,392]
    
    ----action move for first finger----
    ACTION_MOVE[#0 (pid 0)=897,392]
    ACTION_MOVE[#0 (pid 0)=897,392]
    ACTION_MOVE[#0 (pid 0)=897,392]
    ACTION_MOVE[#0 (pid 0)=895,392]
    ACTION_MOVE[#0 (pid 0)=896,393]
    ACTION_MOVE[#0 (pid 0)=896,394]
    ACTION_MOVE[#0 (pid 0)=896,395]
    ACTION_MOVE[#0 (pid 0)=896,396]
    ACTION_MOVE[#0 (pid 0)=895,396]
    ACTION_MOVE[#0 (pid 0)=895,396]
    
    ---second finger down on view B-------
    ACTION_DOWN[#0 (pid 1)=224,87]
    
    ---action move for 1st finger----
    ACTION_MOVE[#0 (pid 0)=895,396]
    
    ---action move for 2nd finger----
    ACTION_MOVE[#0 (pid 1)=224,87]
    
    --first--
    ACTION_MOVE[#0 (pid 0)=895,396]
    
    --second--
    ACTION_MOVE[#0 (pid 1)=224,87]
    
    etc . . .
    ACTION_MOVE[#0 (pid 0)=895,397]
    ACTION_MOVE[#0 (pid 1)=224,87]
    ACTION_MOVE[#0 (pid 0)=895,397]
    ACTION_MOVE[#0 (pid 1)=224,87]
    ACTION_MOVE[#0 (pid 0)=895,397]
    ACTION_MOVE[#0 (pid 1)=223,87]
    ACTION_MOVE[#0 (pid 0)=895,397]
    
        ...

但是，当我第一次触摸 B，然后 A - Android 认为这是一个多点触摸事件并开始发送 MotionEvent object 时，它持有 ACTION_MOVE 坐标，用于仅查看 B 的 2 个指针。

日志猫：

   ----------holding finger at view B------------------
    event ACTION_MOVE[#0 (pid 0)=65,33]
    event ACTION_MOVE[#0 (pid 0)=62,33]
    event ACTION_MOVE[#0 (pid 0)=60,33]
    event ACTION_MOVE[#0 (pid 0)=58,33]
    event ACTION_MOVE[#0 (pid 0)=56,32]
    event ACTION_MOVE[#0 (pid 0)=55,32]
    event ACTION_MOVE[#0 (pid 0)=54,32]
    event ACTION_MOVE[#0 (pid 0)=54,32]
    event ACTION_MOVE[#0 (pid 0)=53,32]
    event ACTION_MOVE[#0 (pid 0)=52,32]
    event ACTION_MOVE[#0 (pid 0)=52,32]
    event ACTION_MOVE[#0 (pid 0)=51,32]
    event ACTION_MOVE[#0 (pid 0)=51,33]
    
    ----------press on view A with 2nd finger, while holding B with first finger-------------
    event ACTION_POINTER_DOWN(pid 1); [#0 (pid 0)=51,33; #1 (pid 1)=1050,-226]
    
    ---------action move obj that holds coords for 2 pointers...---------
    event ACTION_MOVE[#0 (pid 0)=50,33;#1 (pid 1)=1055,-225]
    event ACTION_MOVE[#0 (pid 0)=48,34;#1 (pid 1)=1068,-223]
    event ACTION_MOVE[#0 (pid 0)=47,34;#1 (pid 1)=1082,-224]
    event ACTION_MOVE[#0 (pid 0)=45,35;#1 (pid 1)=1106,-221]
    event ACTION_MOVE[#0 (pid 0)=42,35;#1 (pid 1)=1131,-219]
    event ACTION_MOVE[#0 (pid 0)=38,35;#1 (pid 1)=1157,-217]
    event ACTION_MOVE[#0 (pid 0)=34,35;#1 (pid 1)=1178,-215]
    event ACTION_MOVE[#0 (pid 0)=27,36;#1 (pid 1)=1195,-213]
    event ACTION_MOVE[#0 (pid 0)=20,37;#1 (pid 1)=1211,-213]
    event ACTION_MOVE[#0 (pid 0)=11,39;#1 (pid 1)=1228,-212]

我想要什么：我想要在两种情况下（第一个 A，然后是 B；和第一个 B，然后是 A）中的单独 MotionEvents（第一种情况）

我如何尝试解决它：

  1. 我尝试在视图 B 的onTouch()处仅处理一组坐标，然后返回 false，然后在视图 A 处使用事件，但在这种情况下，我在视图 B 处除了 ACTION_DOWN 什么都没有收到。

  2. 我尝试在dispatchTouchEvent()方法中调度活动中的事件，然后手动调用视图 A 和视图 B 的dispatchTouchEvent()方法，但它没有成功。 我试图传递给 ViewGroup （父布局），但它也没有成功 =( onTouch 没有被调用。

但是我认为这 2 次尝试是 HACK，我想让操作系统从多点触控切换回单独的触控事件。 你知道怎么做吗？

2 个解决方案

解决方案1
 0  2021-03-15 12:10:19

我刚刚创建了一个新项目，将布局设置为您的，然后为两个视图设置不同的“onTouch()”事件。 我无法重现您的情况。 如果两个“onTouch()”事件都返回 TRUE，则结果如下：

//DOWN for A
onTouchA(MotionEvent { action=ACTION_DOWN, actionButton=0, id[0]=0, x[0]=382.0, y[0]=175.0, toolType[0]=TOOL_TYPE_FINGER, buttonState=0, metaState=0, flags=0x0, edgeFlags=0x0, pointerCount=1, historySize=0, eventTime=10987450, downTime=10987450, deviceId=5, source=0x1002 })
onTouchA(MotionEvent { action=ACTION_MOVE, actionButton=0, id[0]=0, x[0]=365.0, y[0]=186.0, toolType[0]=TOOL_TYPE_FINGER, buttonState=0, metaState=0, flags=0x0, edgeFlags=0x0, pointerCount=1, historySize=0, eventTime=10993036, downTime=10987450, deviceId=5, source=0x1002 })
//DOWN for B
onTouchB(MotionEvent { action=ACTION_DOWN, actionButton=0, id[0]=1, x[0]=409.0, y[0]=260.0, toolType[0]=TOOL_TYPE_FINGER, buttonState=0, metaState=0, flags=0x0, edgeFlags=0x0, pointerCount=1, historySize=0, eventTime=10995795, downTime=10987450, deviceId=5, source=0x1002 })
onTouchA(MotionEvent { action=ACTION_MOVE, actionButton=0, id[0]=0, x[0]=363.0, y[0]=184.0, toolType[0]=TOOL_TYPE_FINGER, buttonState=0, metaState=0, flags=0x0, edgeFlags=0x0, pointerCount=1, historySize=0, eventTime=10995795, downTime=10987450, deviceId=5, source=0x1002 })
onTouchB(MotionEvent { action=ACTION_MOVE, actionButton=0, id[0]=1, x[0]=409.0, y[0]=256.0, toolType[0]=TOOL_TYPE_FINGER, buttonState=0, metaState=0, flags=0x0, edgeFlags=0x0, pointerCount=1, historySize=0, eventTime=10995888, downTime=10987450, deviceId=5, source=0x1002 })
onTouchA(MotionEvent { action=ACTION_MOVE, actionButton=0, id[0]=0, x[0]=363.0, y[0]=184.0, toolType[0]=TOOL_TYPE_FINGER, buttonState=0, metaState=0, flags=0x0, edgeFlags=0x0, pointerCount=1, historySize=0, eventTime=10995888, downTime=10987450, deviceId=5, source=0x1002 })
onTouchB(MotionEvent { action=ACTION_MOVE, actionButton=0, id[0]=1, x[0]=409.8291, y[0]=254.1709, toolType[0]=TOOL_TYPE_FINGER, buttonState=0, metaState=0, flags=0x0, edgeFlags=0x0, pointerCount=1, historySize=1, eventTime=10995909, downTime=10987450, deviceId=5, source=0x1002 })
//UP for A
onTouchA(MotionEvent { action=ACTION_UP, actionButton=0, id[0]=0, x[0]=361.0, y[0]=191.0, toolType[0]=TOOL_TYPE_FINGER, buttonState=0, metaState=0, flags=0x0, edgeFlags=0x0, pointerCount=1, historySize=0, eventTime=10998121, downTime=10987450, deviceId=5, source=0x1002 })
onTouchB(MotionEvent { action=ACTION_MOVE, actionButton=0, id[0]=1, x[0]=410.0, y[0]=234.0, toolType[0]=TOOL_TYPE_FINGER, buttonState=0, metaState=0, flags=0x0, edgeFlags=0x0, pointerCount=1, historySize=0, eventTime=10998156, downTime=10987450, deviceId=5, source=0x1002 })
onTouchB(MotionEvent { action=ACTION_MOVE, actionButton=0, id[0]=1, x[0]=410.0, y[0]=235.0, toolType[0]=TOOL_TYPE_FINGER, buttonState=0, metaState=0, flags=0x0, edgeFlags=0x0, pointerCount=1, historySize=0, eventTime=10998285, downTime=10987450, deviceId=5, source=0x1002 })
onTouchB(MotionEvent { action=ACTION_MOVE, actionButton=0, id[0]=1, x[0]=409.0, y[0]=235.0, toolType[0]=TOOL_TYPE_FINGER, buttonState=0, metaState=0, flags=0x0, edgeFlags=0x0, pointerCount=1, historySize=0, eventTime=10998460, downTime=10987450, deviceId=5, source=0x1002 })
onTouchB(MotionEvent { action=ACTION_MOVE, actionButton=0, id[0]=1, x[0]=408.0, y[0]=235.0, toolType[0]=TOOL_TYPE_FINGER, buttonState=0, metaState=0, flags=0x0, edgeFlags=0x0, pointerCount=1, historySize=0, eventTime=10998530, downTime=10987450, deviceId=5, source=0x1002 })
//UP for B
onTouchB(MotionEvent { action=ACTION_UP, actionButton=0, id[0]=1, x[0]=405.0, y[0]=235.0, toolType[0]=TOOL_TYPE_FINGER, buttonState=0, metaState=0, flags=0x0, edgeFlags=0x0, pointerCount=1, historySize=0, eventTime=10998846, downTime=10987450, deviceId=5, source=0x1002 })

=================================

//DOWN for B
onTouchB(MotionEvent { action=ACTION_DOWN, actionButton=0, id[0]=0, x[0]=241.0, y[0]=195.0, toolType[0]=TOOL_TYPE_FINGER, buttonState=0, metaState=0, flags=0x0, edgeFlags=0x0, pointerCount=1, historySize=0, eventTime=11125227, downTime=11125227, deviceId=5, source=0x1002 })
onTouchB(MotionEvent { action=ACTION_MOVE, actionButton=0, id[0]=0, x[0]=221.0, y[0]=196.0, toolType[0]=TOOL_TYPE_FINGER, buttonState=0, metaState=0, flags=0x0, edgeFlags=0x0, pointerCount=1, historySize=0, eventTime=11126010, downTime=11125227, deviceId=5, source=0x1002 })
onTouchB(MotionEvent { action=ACTION_MOVE, actionButton=0, id[0]=0, x[0]=220.0, y[0]=196.0, toolType[0]=TOOL_TYPE_FINGER, buttonState=0, metaState=0, flags=0x0, edgeFlags=0x0, pointerCount=1, historySize=0, eventTime=11126044, downTime=11125227, deviceId=5, source=0x1002 })
//DOWN for A
onTouchA(MotionEvent { action=ACTION_DOWN, actionButton=0, id[0]=1, x[0]=347.0, y[0]=156.0, toolType[0]=TOOL_TYPE_FINGER, buttonState=0, metaState=0, flags=0x0, edgeFlags=0x0, pointerCount=1, historySize=0, eventTime=11128089, downTime=11125227, deviceId=5, source=0x1002 })
onTouchB(MotionEvent { action=ACTION_MOVE, actionButton=0, id[0]=0, x[0]=216.0, y[0]=196.0, toolType[0]=TOOL_TYPE_FINGER, buttonState=0, metaState=0, flags=0x0, edgeFlags=0x0, pointerCount=1, historySize=0, eventTime=11128089, downTime=11125227, deviceId=5, source=0x1002 })
onTouchA(MotionEvent { action=ACTION_MOVE, actionButton=0, id[0]=1, x[0]=347.0, y[0]=156.0, toolType[0]=TOOL_TYPE_FINGER, buttonState=0, metaState=0, flags=0x0, edgeFlags=0x0, pointerCount=1, historySize=0, eventTime=11129071, downTime=11125227, deviceId=5, source=0x1002 })
onTouchB(MotionEvent { action=ACTION_MOVE, actionButton=0, id[0]=0, x[0]=216.0, y[0]=195.0, toolType[0]=TOOL_TYPE_FINGER, buttonState=0, metaState=0, flags=0x0, edgeFlags=0x0, pointerCount=1, historySize=0, eventTime=11129071, downTime=11125227, deviceId=5, source=0x1002 })
onTouchA(MotionEvent { action=ACTION_MOVE, actionButton=0, id[0]=1, x[0]=343.0, y[0]=156.0, toolType[0]=TOOL_TYPE_FINGER, buttonState=0, metaState=0, flags=0x0, edgeFlags=0x0, pointerCount=1, historySize=0, eventTime=11130531, downTime=11125227, deviceId=5, source=0x1002 })
//UP for B
onTouchB(MotionEvent { action=ACTION_UP, actionButton=0, id[0]=0, x[0]=219.91565, y[0]=194.0, toolType[0]=TOOL_TYPE_FINGER, buttonState=0, metaState=0, flags=0x0, edgeFlags=0x0, pointerCount=1, historySize=0, eventTime=11132305, downTime=11125227, deviceId=5, source=0x1002 })
onTouchA(MotionEvent { action=ACTION_MOVE, actionButton=0, id[0]=1, x[0]=337.0, y[0]=156.0, toolType[0]=TOOL_TYPE_FINGER, buttonState=0, metaState=0, flags=0x0, edgeFlags=0x0, pointerCount=1, historySize=0, eventTime=11133099, downTime=11125227, deviceId=5, source=0x1002 })
onTouchA(MotionEvent { action=ACTION_MOVE, actionButton=0, id[0]=1, x[0]=337.0, y[0]=157.0, toolType[0]=TOOL_TYPE_FINGER, buttonState=0, metaState=0, flags=0x0, edgeFlags=0x0, pointerCount=1, historySize=0, eventTime=11133228, downTime=11125227, deviceId=5, source=0x1002 })
//UP for A
onTouchA(MotionEvent { action=ACTION_UP, actionButton=0, id[0]=1, x[0]=337.0, y[0]=157.0, toolType[0]=TOOL_TYPE_FINGER, buttonState=0, metaState=0, flags=0x0, edgeFlags=0x0, pointerCount=1, historySize=0, eventTime=11133240, downTime=11125227, deviceId=5, source=0x1002 })

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">

<TextView
    android:id="@+id/textView"
    android:layout_width="300dp"
    android:layout_height="400dp"
    android:background="@color/teal_200"
    android:text="Hello World!"
    app:layout_constraintBottom_toBottomOf="parent"
    app:layout_constraintHorizontal_bias="0.495"
    app:layout_constraintLeft_toLeftOf="parent"
    app:layout_constraintRight_toRightOf="parent"
    app:layout_constraintTop_toTopOf="parent"
    app:layout_constraintVertical_bias="0.498" />
<TextView
    android:id="@+id/textView2"
    android:layout_width="200dp"
    android:layout_height="200dp"
    android:text="Hello World!"
    android:background="@color/teal_700"
    app:layout_constraintBottom_toBottomOf="parent"
    app:layout_constraintLeft_toLeftOf="parent"
    app:layout_constraintRight_toRightOf="parent"
    app:layout_constraintTop_toTopOf="parent" />
</androidx.constraintlayout.widget.ConstraintLayout>

主要活动代码：

protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_main);

    TextView cTextView = findViewById(R.id.textView);
    cTextView.setOnTouchListener(new View.OnTouchListener() {
        @Override
        public boolean onTouch(View v, MotionEvent event) {
            Log.e(TAG, "onTouchA("+event.toString()+")");
            return true;
        }
    });

    TextView cTextView2 = findViewById(R.id.textView2);
    cTextView2.setOnTouchListener(new View.OnTouchListener() {
        @Override
        public boolean onTouch(View v, MotionEvent event) {
            Log.e(TAG, "onTouchB("+event.toString()+")");
            return false;
        }
    });
}

解决方案2
 -2  2021-03-04 19:05:51

为了防止多点触控问题，您可以简单地关闭 ViewGroup 中的 splitMotionEvents 或 windowEnableSplitTouch 属性

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