子线程调用invalidate()产生“Only the original thread that created a view hierarchy can touch its views.”原因分析

目录

• 1、异常出处
• 2、从View.invalidate()方法开始分析
• 3、ViewRootImpl如何与View进行关联：从Activity的setContentView开始分析
  • 3.1 最顶层的View——DecorView
  • 3.2 DecorView与ViewRootImpl进行关联
• 4、其他
  • 4.1 获取DecorView与ViewRootImpl的直接方法
  • 4.2 硬件加速相关以及invalidate()流程图
  • 4.3 View加载线程问题

备注：本文基于sdk28， ViewActivity页面禁用了硬件加速(AndroidManifest.xml中添加了android:hardwareAccelerated="false")。

1、异常出处

ViewActivity代码链接：https://gitee.com/2820174512/application/blob/master/app/src/main/java/com/example/myapplication/threadcheck/ViewActivity.java

点击Hello，World！后报如下异常：



从图片中可以看出异常在ViewRootImpl类的invalidateChildInParent方法中进行检查的，判断当前线程是否是创建线程（View类一般是在主线程创建的），部分代码如下, 可以看出就是在checkThread方法中抛出的异常。

    @Override
    public ViewParent invalidateChildInParent(int[] location, Rect dirty) {
        checkThread();
        if (DEBUG_DRAW) Log.v(mTag, "Invalidate child: " + dirty);

        ...

        return null;
    }

    void checkThread() {
        if (mThread != Thread.currentThread()) {
            throw new CalledFromWrongThreadException(
                    "Only the original thread that created a view hierarchy can touch its views.");
        }
    }

2、从View.invalidate()方法开始分析

先看下TextView.invalidate()方法（View的invalidate()方法）

    public void invalidate() {
        invalidate(true);
    }

    public void invalidate(boolean invalidateCache) {
        invalidateInternal(0, 0, mRight - mLeft, mBottom - mTop, invalidateCache, true);
    }

    void invalidateInternal(int l, int t, int r, int b, boolean invalidateCache,
            boolean fullInvalidate) {
        ...

        // Reset content capture caches
        mCachedContentCaptureSession = null;

        if ((mPrivateFlags & (PFLAG_DRAWN | PFLAG_HAS_BOUNDS)) == (PFLAG_DRAWN | PFLAG_HAS_BOUNDS)
                || (invalidateCache && (mPrivateFlags & PFLAG_DRAWING_CACHE_VALID) == PFLAG_DRAWING_CACHE_VALID)
                || (mPrivateFlags & PFLAG_INVALIDATED) != PFLAG_INVALIDATED
                || (fullInvalidate && isOpaque() != mLastIsOpaque)) {
            ...

            // Propagate the damage rectangle to the parent view.
            final AttachInfo ai = mAttachInfo;
            final ViewParent p = mParent;
            if (p != null && ai != null && l < r && t < b) {
                final Rect damage = ai.mTmpInvalRect;
                damage.set(l, t, r, b);
                p.invalidateChild(this, damage);
            }

            ...
        }
    }

主要执行逻辑：向上请求父View执行invalidateChild()方法，

该方法为ViewParent接口的方法，ViewGroup类实现了该接口的invalidateChild方法

    public final void invalidateChild(View child, final Rect dirty) {
        final AttachInfo attachInfo = mAttachInfo;
        if (attachInfo != null && attachInfo.mHardwareAccelerated) {
            // HW accelerated fast path
            onDescendantInvalidated(child, child);
            return;
        }

        ViewParent parent = this;
        if (attachInfo != null) {

            ...

            do {
                View view = null;
                if (parent instanceof View) {
                    view = (View) parent;
                }

                if (drawAnimation) {
                    if (view != null) {
                        view.mPrivateFlags |= PFLAG_DRAW_ANIMATION;
                    } else if (parent instanceof ViewRootImpl) {
                        ((ViewRootImpl) parent).mIsAnimating = true;
                    }
                }

                ...

                parent = parent.invalidateChildInParent(location, dirty);
                if (view != null) {
                    // Account for transform on current parent
                    Matrix m = view.getMatrix();
                    if (!m.isIdentity()) {
                        RectF boundingRect = attachInfo.mTmpTransformRect;
                        boundingRect.set(dirty);
                        m.mapRect(boundingRect);
                        dirty.set((int) Math.floor(boundingRect.left),
                                (int) Math.floor(boundingRect.top),
                                (int) Math.ceil(boundingRect.right),
                                (int) Math.ceil(boundingRect.bottom));
                    }
                }
            } while (parent != null);
        }
    }

    public ViewParent invalidateChildInParent(final int[] location, final Rect dirty) {
        if ((mPrivateFlags & (PFLAG_DRAWN | PFLAG_DRAWING_CACHE_VALID)) != 0) {

            ...

            return mParent;
        }

        return null;
    }

do while循环一层层向上请求重绘，最终应该是到ViewRootImpl类的invalidateChildInParent方法

3、ViewRootImpl如何与View进行关联：从Activity的setContentView开始分析

3.1 最顶层的View——DecorView

要将View显示到界面上，需要在Activity中执行setContentView，这里主要分析setContentView(View)方法

    public void setContentView(View view) {
        getWindow().setContentView(view);
        initWindowDecorActionBar();
    }

    public Window getWindow() {
        return mWindow;
    }

    final void attach(Context context, ActivityThread aThread,
            Instrumentation instr, IBinder token, int ident,
            Application application, Intent intent, ActivityInfo info,
            CharSequence title, Activity parent, String id,
            NonConfigurationInstances lastNonConfigurationInstances,
            Configuration config, String referrer, IVoiceInteractor voiceInteractor,
            Window window, ActivityConfigCallback activityConfigCallback) {
        attachBaseContext(context);

        mFragments.attachHost(null /*parent*/);

        mWindow = new PhoneWindow(this, window, activityConfigCallback);

        ...
    }

mWindow属性在android.app.Activity#attach方法中进行赋值， 实现类为PhoneWindow，而PhoneWindow的setContentView实现如下：

    // This is the top-level view of the window, containing the window decor.
    private DecorView mDecor;

    @Override
    public void setContentView(View view) {
        setContentView(view, new ViewGroup.LayoutParams(MATCH_PARENT, MATCH_PARENT));
    }

    @Override
    public void setContentView(View view, ViewGroup.LayoutParams params) {
        // Note: FEATURE_CONTENT_TRANSITIONS may be set in the process of installing the window
        // decor, when theme attributes and the like are crystalized. Do not check the feature
        // before this happens.
        if (mContentParent == null) {
            installDecor();
        } else if (!hasFeature(FEATURE_CONTENT_TRANSITIONS)) {
            mContentParent.removeAllViews();
        }

        if (hasFeature(FEATURE_CONTENT_TRANSITIONS)) {
            view.setLayoutParams(params);
            final Scene newScene = new Scene(mContentParent, view);
            transitionTo(newScene);
        } else {
            mContentParent.addView(view, params);
        }
        mContentParent.requestApplyInsets();
        final Callback cb = getCallback();
        if (cb != null && !isDestroyed()) {
            cb.onContentChanged();
        }
        mContentParentExplicitlySet = true;
    }

    private void installDecor() {
        mForceDecorInstall = false;
        if (mDecor == null) {
            mDecor = generateDecor(-1);
            mDecor.setDescendantFocusability(ViewGroup.FOCUS_AFTER_DESCENDANTS);
            mDecor.setIsRootNamespace(true);
            if (!mInvalidatePanelMenuPosted && mInvalidatePanelMenuFeatures != 0) {
                mDecor.postOnAnimation(mInvalidatePanelMenuRunnable);
            }
        } else {
            mDecor.setWindow(this);
        }

        ...
    }

    protected DecorView generateDecor(int featureId) {
        // System process doesn't have application context and in that case we need to directly use
        // the context we have. Otherwise we want the application context, so we don't cling to the
        // activity.
        Context context;
        if (mUseDecorContext) {
            Context applicationContext = getContext().getApplicationContext();
            if (applicationContext == null) {
                context = getContext();
            } else {
                context = new DecorContext(applicationContext, getContext());
                if (mTheme != -1) {
                    context.setTheme(mTheme);
                }
            }
        } else {
            context = getContext();
        }
        return new DecorView(context, featureId, this, getAttributes());
    }

可以看出mDecor为View树中最顶层的View，是DecorView类的一个实例。

3.2 DecorView与ViewRootImpl进行关联

这里我是通过搜索“DecorView如何与ViewRootImpl进行关联”才知道具体关联代码，见链接https://www.cnblogs.com/huansky/p/11911549.html

主要在ActivityThread类的handleResumeActivity方法中

    @Override
    public void handleResumeActivity(IBinder token, boolean finalStateRequest, boolean isForward,
            String reason) {
        // If we are getting ready to gc after going to the background, well
        // we are back active so skip it.
        unscheduleGcIdler();
        mSomeActivitiesChanged = true;

        // TODO Push resumeArgs into the activity for consideration
        final ActivityClientRecord r = performResumeActivity(token, finalStateRequest, reason);
        if (r == null) {
            // We didn't actually resume the activity, so skipping any follow-up actions.
            return;
        }

        final Activity a = r.activity;

        if (localLOGV) {
            Slog.v(TAG, "Resume " + r + " started activity: " + a.mStartedActivity
                    + ", hideForNow: " + r.hideForNow + ", finished: " + a.mFinished);
        }

        final int forwardBit = isForward
                ? WindowManager.LayoutParams.SOFT_INPUT_IS_FORWARD_NAVIGATION : 0;

        // If the window hasn't yet been added to the window manager,
        // and this guy didn't finish itself or start another activity,
        // then go ahead and add the window.
        boolean willBeVisible = !a.mStartedActivity;
        if (!willBeVisible) {
            try {
                willBeVisible = ActivityManager.getService().willActivityBeVisible(
                        a.getActivityToken());
            } catch (RemoteException e) {
                throw e.rethrowFromSystemServer();
            }
        }
        if (r.window == null && !a.mFinished && willBeVisible) {
            r.window = r.activity.getWindow();
            View decor = r.window.getDecorView();
            decor.setVisibility(View.INVISIBLE);
            ViewManager wm = a.getWindowManager();
            WindowManager.LayoutParams l = r.window.getAttributes();
            a.mDecor = decor;
            l.type = WindowManager.LayoutParams.TYPE_BASE_APPLICATION;
            l.softInputMode |= forwardBit;
            if (r.mPreserveWindow) {
                a.mWindowAdded = true;
                r.mPreserveWindow = false;
                // Normally the ViewRoot sets up callbacks with the Activity
                // in addView->ViewRootImpl#setView. If we are instead reusing
                // the decor view we have to notify the view root that the
                // callbacks may have changed.
                ViewRootImpl impl = decor.getViewRootImpl();
                if (impl != null) {
                    impl.notifyChildRebuilt();
                }
            }
            if (a.mVisibleFromClient) {
                if (!a.mWindowAdded) {
                    a.mWindowAdded = true;
                    wm.addView(decor, l);
                } else {
                    // The activity will get a callback for this {@link LayoutParams} change
                    // earlier. However, at that time the decor will not be set (this is set
                    // in this method), so no action will be taken. This call ensures the
                    // callback occurs with the decor set.
                    a.onWindowAttributesChanged(l);
                }
            }

            // If the window has already been added, but during resume
            // we started another activity, then don't yet make the
            // window visible.
        } else if (!willBeVisible) {
            if (localLOGV) Slog.v(TAG, "Launch " + r + " mStartedActivity set");
            r.hideForNow = true;
        }

        ...
    }

一般执行流程： 获取Activity实例a对应的WindowManager实例wm，然后addView。

Activity的attach方法中对mWindowManager对象赋值，mWindowManager对象从mWindow对象中获得

    final void attach(Context context, ActivityThread aThread,
            Instrumentation instr, IBinder token, int ident,
            Application application, Intent intent, ActivityInfo info,
            CharSequence title, Activity parent, String id,
            NonConfigurationInstances lastNonConfigurationInstances,
            Configuration config, String referrer, IVoiceInteractor voiceInteractor,
            Window window, ActivityConfigCallback activityConfigCallback) {
        attachBaseContext(context);

        mFragments.attachHost(null /*parent*/);

        mWindow = new PhoneWindow(this, window, activityConfigCallback);

        ...

        mWindowManager = mWindow.getWindowManager();
        ...
    }

mWindow对象为Window类，getWindowManager实现如下，则ActivityThread类中handleResumeActivity获取的wm对象实现类为WindowManagerImpl类

    public WindowManager getWindowManager() {
        return mWindowManager;
    }

    public void setWindowManager(WindowManager wm, IBinder appToken, String appName,
            boolean hardwareAccelerated) {
        mAppToken = appToken;
        mAppName = appName;
        mHardwareAccelerated = hardwareAccelerated
                || SystemProperties.getBoolean(PROPERTY_HARDWARE_UI, false);
        if (wm == null) {
            wm = (WindowManager)mContext.getSystemService(Context.WINDOW_SERVICE);
        }
        mWindowManager = ((WindowManagerImpl)wm).createLocalWindowManager(this);
    }

WindowManagerImpl类addView(View, ViewGroup.LayoutParams)实现如下

    @Override
    public void addView(@NonNull View view, @NonNull ViewGroup.LayoutParams params) {
        applyDefaultToken(params);
        mGlobal.addView(view, params, mContext.getDisplay(), mParentWindow);
    }

委托给WindowManagerGlobal类的addView(View, ViewGroup.LayoutParams, Display, Window)实现，最终调用ViewRootImpl的setView方法关联DecorView与ViewRootImpl

public void addView(View view, ViewGroup.LayoutParams params,
            Display display, Window parentWindow) {

        ...

        ViewRootImpl root;
        View panelParentView = null;

        synchronized (mLock) {
            ...

            root = new ViewRootImpl(view.getContext(), display);

            view.setLayoutParams(wparams);

            mViews.add(view);
            mRoots.add(root);
            mParams.add(wparams);

            // do this last because it fires off messages to start doing things
            try {
                root.setView(view, wparams, panelParentView);
            } catch (RuntimeException e) {
                // BadTokenException or InvalidDisplayException, clean up.
                if (index >= 0) {
                    removeViewLocked(index, true);
                }
                throw e;
            }
        }
    }

4、其他

4.1 获取DecorView与ViewRootImpl的直接方法

在View中mParent只有一处赋值，就是在void assignParent(ViewParent parent)方法中，可以在这里添加一个条件断点 parent instanceof ViewRootImpl， 就可以获取对应的调用信息

4.2 硬件加速相关以及invalidate()流程图

ViewGroup类的invalidateChild部分代码如下，

    public final void invalidateChild(View child, final Rect dirty) {
        final AttachInfo attachInfo = mAttachInfo;
        if (attachInfo != null && attachInfo.mHardwareAccelerated) {
            // HW accelerated fast path
            onDescendantInvalidated(child, child);
            return;
        }

        ...

        do {
            View view = null;
            if (parent instanceof View) {
                view = (View) parent;
            }

            if (drawAnimation) {
                if (view != null) {
                    view.mPrivateFlags |= PFLAG_DRAW_ANIMATION;
                } else if (parent instanceof ViewRootImpl) {
                    ((ViewRootImpl) parent).mIsAnimating = true;
                }
            }

            // If the parent is dirty opaque or not dirty, mark it dirty with the opaque
            // flag coming from the child that initiated the invalidate
            if (view != null) {
                if ((view.mViewFlags & FADING_EDGE_MASK) != 0 &&
                        view.getSolidColor() == 0) {
                    opaqueFlag = PFLAG_DIRTY;
                }
                if ((view.mPrivateFlags & PFLAG_DIRTY_MASK) != PFLAG_DIRTY) {
                    view.mPrivateFlags = (view.mPrivateFlags & ~PFLAG_DIRTY_MASK) | opaqueFlag;
                }
            }

            parent = parent.invalidateChildInParent(location, dirty);
            if (view != null) {
                // Account for transform on current parent
                Matrix m = view.getMatrix();
                if (!m.isIdentity()) {
                    RectF boundingRect = attachInfo.mTmpTransformRect;
                    boundingRect.set(dirty);
                    m.mapRect(boundingRect);
                    dirty.set((int) Math.floor(boundingRect.left),
                            (int) Math.floor(boundingRect.top),
                            (int) Math.ceil(boundingRect.right),
                            (int) Math.ceil(boundingRect.bottom));
                }
            }
        } while (parent != null);
    }

其中attachInfo.mHardwareAccelerated表示启用硬件加速，如果启用硬件加速，子线程invalidate()不会产生异常（genymotion9.0模拟器中未产生异常，genymotion6.0模拟器中会产生异常）。

本文开始在activity中禁用硬件加速就是因为这个原因，而像子线程中requestLayout、addView等硬件没有加速问题，一定会报异常。

invalidate()执行后方法调用流程图如下：

4.3 View加载线程问题

只要View没有添加到Window中View就可以在子线程中操作，不过会有线程安全问题。