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安卓app和fw通用面试题:请系统角度解释ACTION_CANCEL怎么产生,背后原理是啥?

安卓app和fw通用面试题:请系统角度解释ACTION_CANCEL怎么产生,背后原理是啥?

背景:

大家对于MotionEvent.ACTION_CANCEL这个cancel事件是不是感觉又熟悉又陌生,熟悉是因为经常在onTouch识别触摸事件时候会把它和ACTION_UP放在一块处理,基本停留在字面意思理解为 “”取消“”。但是真正这个ACTION_CANCEL具体桌面来的其实很多人是不清楚的,所以本文来给大家分享一下ACTION_CANCEL的最简单的一种产生方式,并对它进行深入剖析。

其实核心总结ACTION_CANCEL产生的场景可以根据进程来划分:主要就有服务端进程就是system_server的InputDispatcher中产生cancel事件,还有就是app进程自身逻辑产生cancel事件。

本文主要先从简单的app进程自身逻辑产生cancel事件来进行深入剖析,服务端产生的cancel事件下一篇文章在剖析

App端ACTION_CANCEL事件触发场景和原因剖析

父布局拦截事件情况

复现打印出ACTION_CANCEL的log,在Activity的子view中对CANCEL事件打印确认:

customTextView.setOnTouchListener(new View.OnTouchListener() {
@Override
publicbooleanonTouch(View view, MotionEvent motionEvent){
        Log.i("test2"," onTouch motionEvent = " + motionEvent);
if (motionEvent.getAction() == MotionEvent.ACTION_CANCEL || motionEvent.getAction() == MotionEvent.ACTION_UP ) {
            Log.i("test2"," onTouch ACTION_CANCEL = " ,new Exception());
        }
returntrue;
    }
});

首先我们来分析应用触摸最常见的ACTION_CANCEL情况:这个就是我们常见的一个父布局MyLayout,它装载了2个子控件textview1和textview2.假设一个触摸事件到来,我们知道触摸事件的传递顺序就是:

父布局  -- 》 子布局

这样的一个顺序,也就是其实事件父布局是具有完全的决策权利来是否给子布局,可以通过方法onInterceptTouchEvent。 接下来我们又来看看MotionEvent,一个正常完整触摸应该是怎么个顺序呢? ACTION_DOWN -- > ACTION_MOVE --> ACTION_UP 所以说我们控件正常事件处理就是最少要有DOWN --》UP两个事件,才代表事件介绍,那么你会问如果只有DOWN,和MOVE是否可以呢?

答案:当然是不可以的

为啥呢? 大家可以想一下这样一个场景,你是一个按钮,来了触摸事件DOWN了后,你把按钮变成selected状态了,你本来一直等值来个UP事件来变回正常状态,如果系统发生依次你没有收到UP会怎么样呢?那就是你的应用按钮就永远处于选中selected状态无法取消,一直到进程关闭(当然说是正常你没有特别处理情况)。

所以有了以上基础后,大家就知道有了DOWN事件一般都要有UP事件才算完整,但是有一些场景他就是可能收到了DOWN,后面收不到UP了怎么办? 比如看如下例子:

@Override
publicbooleanonInterceptTouchEvent(MotionEvent ev){
        Log.i("test2","onInterceptTouchEvent ev = " + ev);
if (ev.getAction() == MotionEvent.ACTION_MOVE ) {//我们不拦截DOWN事件,但是拦截MOVE事件,父布局一拦截,子控件就会收到ACTION_CANCEL
returntrue;
        }
returnsuper.onInterceptTouchEvent(ev);
    }

这种情况我们父布局只并没有拦截DOWN事件,所以DOWN传递给你textview1,但是因为在MOVE时候我们父布局拦截了,即说明事件不再传递给子控件了textview1,那么这个是不是就是textview1收到了DOWN,但是收不到UP情况,不完整了,那该怎么办?

这个时候其实就是今天重点介绍的ACTION_CANCEL出场,他就是来帮忙解决上面的因为父布局中间进行了触摸事件拦截,但是子布局又要一个完整触摸过程,那么就需要传递一个触摸事件给子控件,那么传递什么合适? 大家肯定会想UP最合适,UP不就可以了?但是你要想想用户还没有UP啊?如果传递了UP是不是也可能会有问题,所以这时候就是传递ACTION_CANCEL,它代表是取消,即代表这个触摸事件到此被取消结束了。控件收到需要自己做对应的扫尾工作,保证事件完整。

上面我们已经对ACTION_CANCEL触发场景和原因已经清楚,接下来看看源码是怎么处理的:

父布局拦截事件导致ACTION_CANCEL出现源码分析

app代码: layout.xml

     android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:orientation="vertical"
        android:paddingTop="100dp"
        >
<TextView
android:id="@+id/custom_text"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="Hello CustomLayout !"
            >
</TextView>

</com.example.anrdemo.CustomLayout>

代码端对onTouch的事件进行监听:

   TextView customTextView = (TextView)findViewById(R.id.custom_text);
        customTextView.setOnTouchListener(new View.OnTouchListener() {
@Override
publicbooleanonTouch(View view, MotionEvent motionEvent){
                Log.i("test2"," onTouch motionEvent = " + motionEvent);
if (motionEvent.getAction() == MotionEvent.ACTION_CANCEL || motionEvent.getAction() == MotionEvent.ACTION_UP ) {
//变成了CANCEL后打印一下堆栈,追踪框架哪里进行了改变
                    Log.i("test2"," onTouch ACTION_CANCEL = " ,new Exception());
                }
returntrue;
            }
        });
2021-11-2713:50:06.9117010-7010/com.example.anrdemo I/test2:  onTouch ACTION_CANCEL = 
    java.lang.Exception
        at com.example.anrdemo.MainActivity$2.onTouch(MainActivity.java:46)
        at android.view.View.dispatchTouchEvent(View.java:13949)
        at android.view.ViewGroup.dispatchTransformedTouchEvent(ViewGroup.java:3030)
        at android.view.ViewGroup.dispatchTouchEvent(ViewGroup.java:2755)
        at android.view.ViewGroup.dispatchTransformedTouchEvent(ViewGroup.java:3060)
        at android.view.ViewGroup.dispatchTouchEvent(ViewGroup.java:2755)
        at android.view.ViewGroup.dispatchTransformedTouchEvent(ViewGroup.java:3060)
        at android.view.ViewGroup.dispatchTouchEvent(ViewGroup.java:2755)
        at android.view.ViewGroup.dispatchTransformedTouchEvent(ViewGroup.java:3060)
        at android.view.ViewGroup.dispatchTouchEvent(ViewGroup.java:2755)
        at android.view.ViewGroup.dispatchTransformedTouchEvent(ViewGroup.java:3060)
        at android.view.ViewGroup.dispatchTouchEvent(ViewGroup.java:2755)
        at android.view.ViewGroup.dispatchTransformedTouchEvent(ViewGroup.java:3060)
        at android.view.ViewGroup.dispatchTouchEvent(ViewGroup.java:2755)
        at android.view.ViewGroup.dispatchTransformedTouchEvent(ViewGroup.java:3060)
        at android.view.ViewGroup.dispatchTouchEvent(ViewGroup.java:2755)
        at com.android.internal.policy.DecorView.superDispatchTouchEvent(DecorView.java:465)
        at com.android.internal.policy.PhoneWindow.superDispatchTouchEvent(PhoneWindow.java:1849)
        at android.app.Activity.dispatchTouchEvent(Activity.java:4011)
        at com.example.anrdemo.MainActivity.dispatchTouchEvent(MainActivity.java:72)
        at androidx.appcompat.view.WindowCallbackWrapper.dispatchTouchEvent(WindowCallbackWrapper.java:69)
        at androidx.appcompat.view.WindowCallbackWrapper.dispatchTouchEvent(WindowCallbackWrapper.java:69)
        at com.android.internal.policy.DecorView.dispatchTouchEvent(DecorView.java:423)
        at android.view.View.dispatchPointerEvent(View.java:14212)
        at android.view.ViewRootImpl$ViewPostImeInputStage.processPointerEvent(ViewRootImpl.java:5652)
        at android.view.ViewRootImpl$ViewPostImeInputStage.onProcess(ViewRootImpl.java:5455)
        at android.view.ViewRootImpl$InputStage.deliver(ViewRootImpl.java:4958)
        at android.view.ViewRootImpl$InputStage.onDeliverToNext(ViewRootImpl.java:5011)
        at android.view.ViewRootImpl$InputStage.forward(ViewRootImpl.java:4977)
        at android.view.ViewRootImpl$AsyncInputStage.forward(ViewRootImpl.java:5117)
        at android.view.ViewRootImpl$InputStage.apply(ViewRootImpl.java:4985)
        at android.view.ViewRootImpl$AsyncInputStage.apply(ViewRootImpl.java:5174)
        at android.view.ViewRootImpl$InputStage.deliver(ViewRootImpl.java:4958)
        at android.view.ViewRootImpl$InputStage.onDeliverToNext(ViewRootImpl.java:5011)
        at android.view.ViewRootImpl$InputStage.forward(ViewRootImpl.java:4977)
        at android.view.ViewRootImpl$InputStage.apply(ViewRootImpl.java:4985)
        at android.view.ViewRootImpl$InputStage.deliver(ViewRootImpl.java:4958)
        at android.view.ViewRootImpl.deliverInputEvent(ViewRootImpl.java:7675)
        at android.view.ViewRootImpl.doProcessInputEvents(ViewRootImpl.java:7644)
        at android.view.ViewRootImpl.enqueueInputEvent(ViewRootImpl.java:7605)
        at android.view.ViewRootImpl$WindowInputEventReceiver.onInputEvent(ViewRootImpl.java:7800)
        at android.view.InputEventReceiver.dispatchInputEvent(InputEventReceiver.java:188)
        at android.view.InputEventReceiver.nativeConsumeBatchedInputEvents(Native Method)
        at android.view.InputEventReceiver.consumeBatchedInputEvents(InputEventReceiver.java:178)
        at android.view.ViewRootImpl.doConsumeBatchedInput(ViewRootImpl.java:7751)
        at android.view.ViewRootImpl$ConsumeBatchedInputRunnable.run(ViewRootImpl.java:7824)
        at android.view.Choreographer$CallbackRecord.run(Choreographer.java:967)
        at android.view.Choreographer.doCallbacks(Choreographer.java:791)
        at android.view.Choreographer.doFrame(Choreographer.java:719)
        at android.view.Choreographer$FrameDisplayEventReceiver.run(Choreographer.java:952)
        at android.os.Handler.handleCallback(Handler.java:883)
        at android.os.Handler.dispatchMessage(Handler.java:100)

这里就打印出来了框架调用到onTouch中MotionEvent变成CANCEL的流程,方便我们进行源码分析。 具体大家可以自己取追踪,这里我这边列出结果: base/core/java/android/view/ViewGroup.java


// Check for interception.
finalboolean intercepted;
if (actionMasked == MotionEvent.ACTION_DOWN
                    || mFirstTouchTarget != null) {
finalboolean disallowIntercept = (mGroupFlags & FLAG_DISALLOW_INTERCEPT) != 0;
if (!disallowIntercept) {
                    intercepted = onInterceptTouchEvent(ev);
                    ev.setAction(action); // restore action in case it was changed
                } else {
                    intercepted = false;
                }
            } 

这里onInterceptTouchEvent会调用到我们CustomLayout的onInterceptTouchEvent,我们识别到了如果MOVE就return true,所以intercepted这个时候也是true。

finalboolean cancelChild = resetCancelNextUpFlag(target.child)
                                || intercepted;
if (dispatchTransformedTouchEvent(ev, cancelChild,
                                target.child, target.pointerIdBits))

这里cancelChild就变成了true,所以

privatebooleandispatchTransformedTouchEvent(MotionEvent event, boolean cancel,
            View child, int desiredPointerIdBits)
{
finalboolean handled;

finalint oldAction = event.getAction();
if (cancel || oldAction == MotionEvent.ACTION_CANCEL) {//根据前面cancelChild变成了CANCEL
            event.setAction(MotionEvent.ACTION_CANCEL);
if (child == null) {
                handled = super.dispatchTouchEvent(event);
            } else {
                handled = child.dispatchTouchEvent(event);
            }
            event.setAction(oldAction);
return handled;
        }
//---省略部分
}

从以上可以看出,结合我们Input专题学习知识,我们知道触摸事件InputDispatcher传递给App实际还是ACTION_MOVE,但是app进程ViewGroup的策略把事件变成了ACTION_CANCEL来保证事件的完整性。 总结流程图:

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  1. CONNECT:[ UseTime:0.001049s ] mysql:host=127.0.0.1;port=3306;dbname=wenku;charset=utf8mb4
  2. SHOW FULL COLUMNS FROM `fenlei` [ RunTime:0.001034s ]
  3. SELECT * FROM `fenlei` WHERE `fid` = 0 [ RunTime:0.000330s ]
  4. SELECT * FROM `fenlei` WHERE `fid` = 63 [ RunTime:0.000308s ]
  5. SHOW FULL COLUMNS FROM `set` [ RunTime:0.000529s ]
  6. SELECT * FROM `set` [ RunTime:0.000216s ]
  7. SHOW FULL COLUMNS FROM `article` [ RunTime:0.000532s ]
  8. SELECT * FROM `article` WHERE `id` = 856656 LIMIT 1 [ RunTime:0.003308s ]
  9. UPDATE `article` SET `lasttime` = 1783840847 WHERE `id` = 856656 [ RunTime:0.010249s ]
  10. SELECT * FROM `fenlei` WHERE `id` = 64 LIMIT 1 [ RunTime:0.000342s ]
  11. SELECT * FROM `article` WHERE `id` < 856656 ORDER BY `id` DESC LIMIT 1 [ RunTime:0.000677s ]
  12. SELECT * FROM `article` WHERE `id` > 856656 ORDER BY `id` ASC LIMIT 1 [ RunTime:0.000529s ]
  13. SELECT * FROM `article` WHERE `id` < 856656 ORDER BY `id` DESC LIMIT 10 [ RunTime:0.000676s ]
  14. SELECT * FROM `article` WHERE `id` < 856656 ORDER BY `id` DESC LIMIT 10,10 [ RunTime:0.003910s ]
  15. SELECT * FROM `article` WHERE `id` < 856656 ORDER BY `id` DESC LIMIT 20,10 [ RunTime:0.001198s ]
0.205151s