Android插图：处理恐惧并为Android Q做准备

典型任务

 <style name="AppTheme" parent="Theme.AppCompat.Light.NoActionBar">
    ...
    <item name="colorPrimaryDark">@color/colorAccent</item>
    ...
</style>

<style name="AppTheme" parent="Theme.AppCompat.Light.NoActionBar">
    ...
    <item name="android:statusBarColor">@color/colorAccent</item>
    ...
</style>

override fun onCreateView(...): View {
    requireActivity().window.statusBarColor = requireContext().getColor(R.color.colorPrimary)
    ...
}

<style name="AppTheme" parent="Theme.AppCompat.Light.NoActionBar">    
    ...
    <item name="android:windowTranslucentStatus">true</item>
    ...
</style>

<activity
    ...
    android:windowSoftInputMode="adjustResize">
    ...
</activity>

boolean isOpened = false;

public void setListenerToRootView() {
    final View activityRootView = getWindow().getDecorView().findViewById(android.R.id.content);
    activityRootView.getViewTreeObserver().addOnGlobalLayoutListener(new OnGlobalLayoutListener() {
        @Override
        public void onGlobalLayout() {
    
            int heightDiff = activityRootView.getRootView().getHeight() - activityRootView.getHeight();      
            if (heightDiff > 100) { // 99% of the time the height diff will be due to a keyboard.       
                Toast.makeText(getApplicationContext(), "Gotcha!!! softKeyboardup", 0).show();

                if (isOpened == false) {
                   //Do two things, make the view top visible and the editText smaller
                }
                isOpened = true;
            } else if (isOpened == true) {
                Toast.makeText(getApplicationContext(), "softkeyborad Down!!!", 0).show();
                isOpened = false;
            }    
        }
    });
}

Android 10之前我们做了什么

为什么行得通？

@Override
public void onAttachedToWindow() {   
    super.onAttachedToWindow();
    ...    
    if (mLastInsets == null && ViewCompat.getFitsSystemWindows(this)) {         
        // We're set to fitSystemWindows but we haven't had any insets yet...
        // We should request a new dispatch of window insets
        ViewCompat.requestApplyInsets(this);
    }     
    ...
}

@Override
public WindowInsets dispatchApplyWindowInsets(WindowInsets insets) {    
    insets = super.dispatchApplyWindowInsets(insets);     
    if (!insets.isConsumed()) {         
        final int count = getChildCount();        
        for (int i = 0; i < count; i++) {
            insets = getChildAt(i).dispatchApplyWindowInsets(insets);             
            if (insets.isConsumed()) {          
                break;
            }
        }
    }
    return insets;
}

我们编写自己的ViewGroup

class WindowInsetFrameLayout @JvmOverloads constructor(
    context: Context,      
    attrs: AttributeSet? = null,     
    defStyleRes: Int = 0
) : FrameLayout(context, attrs, defStyleRes) {

    override fun dispatchApplyWindowInsets(insets: WindowInsets): WindowInsets { 
        for (child in (0 until childCount)) {
            getChildAt(child).dispatchApplyWindowInsets(insets)
        }
        return insets.consumeSystemWindowInsets()
    }
}

Android 10

插图 您需要了解什么？

创建插图是为了吓developers开发人员。

系统窗口插图

可贴图元素插图

系统手势插入

强制系统手势插入

稳定的插图

刘海和领口

• LAYOUT_IN_DISPLAY_CUTOUT_MODE_DEFAULT。默认情况下，在肖像中-有风景；在风景中-有黑条。
• LAYOUT_IN_DISPLAY_CUTOUT_MODE_NEVER。完全没有-黑色条纹。
• LAYOUT_IN_DISPLAY_CUTOUT_MODE_SHORT_EDGES -永远是。

insets.displayCutout
    .boundingRects
    .forEach { rect -> ... }

怎么运行的

价差

处理插图

我们通过委派或继承处理Inset。

为什么要退货？

实践

开启透明度

<style name="AppTheme" parent="Theme.MaterialComponents.Light">
    <item name="android:windowTranslucentStatus">true</item>
    <item name="android:windowTranslucentNavigation">true</item>
</style>

用颜色打开透明度

rootView.systemUiVisibility = View.SYSTEM_UI_FLAG_LAYOUT_STABLE or  
    View.SYSTEM_UI_FLAG_LAYOUT_HIDE_NAVIGATION

<style name="AppTheme" parent="Theme.MaterialComponents.Light">
    <!-- Set the navigation bar to 50% translucent white -->
    <item name="android:navigationBarColor">#80FFFFFF</item> 
</style>

有什么比处理插图更容易的呢？

ViewCompat
    .setOnApplyWindowInsetsListener(bottomNav) { view, insets ->  
        view.updatePadding(bottom = insets.systemWindowInsetBottom) 
        insets
    }

val bottomNavBottomPadding = bottomNav.paddingBottom
ViewCompat
    .setOnApplyWindowInsetsListener(bottomNav) { view, insets ->                 
        view.updatePadding(
        bottom = bottomNavBottomPadding + insets.systemWindowInsetBottom
    )
    Insets
}

添加科特林！

fun View.doOnApplyWindowInsets(block: (View, WindowInsetsCompat, Rect) -> WindowInsetsCompat) {    

    val initialPadding = recordInitialPaddingForView(this)

    ViewCompat.setOnApplyWindowInsetsListener(this) { v, insets ->        
        block(v, insets, initialPadding)
    }
    
    requestApplyInsetsWhenAttached()
}

private fun recordInitialPaddingForView(view: View) =
   Rect(view.paddingLeft, view.paddingTop, view.paddingRight, view.paddingBottom)

  .

bottomNav.doOnApplyWindowInsets { view, insets, padding ->   
    view.updatePadding(
        bottom = padding.bottom + insets.systemWindowInsetBottom
    ) 
    insets
}

遗忘的东西！

fun View.doOnApplyWindowInsets(block: (View, WindowInsetsCompat, Rect) -> WindowInsetsCompat) {

    val initialPadding = recordInitialPaddingForView(this)
     
    ViewCompat.setOnApplyWindowInsetsListener(this) { v, insets ->        
        block(v, insets, initialPadding)
    }
      
    requestApplyInsetsWhenAttached() 
}

private fun recordInitialPaddingForView(view: View) =
      Rect(view.paddingLeft, view.paddingTop, view.paddingRight, view.paddingBottom)

fun View.requestApplyInsetsWhenAttached() {    
    if (isAttachedToWindow) {        
        requestApplyInsets()
    } else {
        addOnAttachStateChangeListener(object : View.OnAttachStateChangeListener {            
            override fun onViewAttachedToWindow(v: View) {
                v.removeOnAttachStateChangeListener(this)
                v.requestApplyInsets()           
            }

            override fun onViewDetachedFromWindow(v: View) = Unit
        })
    }
}

完善RecyclerView

<androidx.recyclerview.widget.RecyclerView 
        android:id="@+id/recyclerView"        
    android:layout_width="match_parent"    
    android:layout_height="match_parent"             
    android:clipToPadding="false" />

recyclerView.doOnApplyWindowInsets { view, insets, padding ->    
    view.updatePadding(
        bottom = padding.bottom + insets.systemWindowInsetBottom
    )
}

应用程序错误

doOnApplyWindowInsets { view, insets, initialPadding ->    
    view.updatePadding(
        bottom = initialPadding.bottom + insets.systemWindowInsetBottom
    )
    insets.replaceSystemWindowInsets(
        Rect(
            insets.systemWindowInsetLeft,            
            insets.systemWindowInsetTop,            
            insets.systemWindowInsetRight,
            0
        )
    )
}

重新定义全部

@Override
public WindowInsets dispatchApplyWindowInsets(WindowInsets insets) {     
    insets = super.dispatchApplyWindowInsets(insets);     
    if (!insets.isConsumed()) {        
        final int count = getChildCount();
        for (int i = 0; i < count; i++) {
            insets = getChildAt(i).dispatchApplyWindowInsets(insets);
            if (insets.isConsumed()) {
                break;
            }
        }
    }
    return insets;
}

fun View.addSystemBottomPadding(    
    targetView: View = this
) {
    doOnApplyWindowInsets { _, insets, initialPadding ->           
        targetView.updatePadding(
            bottom = initialPadding.bottom + insets.systemWindowInsetBottom
        )
        insets.replaceSystemWindowInsets(
            Rect(
                insets.systemWindowInsetLeft,
                insets.systemWindowInsetTop,     
                insets.systemWindowInsetRight,
                0
            )
        )
    }
}

• 首先，他将提供插图底部导航栏。 
• 那将处理插图，将返回零底。
• 此外，默认情况下，它们将自上而下：工具栏，带有RecyclerView的片段。
• 然后，也许他会再次发送插图底部导航栏。但这不再重要，一切都会很好。

重要

Android 10准备清单

• 电报中的@rmr_spb-Redmadrobot SPb的内部mitap记录。
• 本文中的所有源代码，以及GitFox中的更多源代码。有一个单独的Android 10分支，在这里您可以通过commit看到我如何完成所有这些工作以及我如何支持新的Android。
• 克里斯·贝恩（Chris Bane）的Insetter图书馆。它包含了我展示的5-6个扩展名。要在您的项目中使用，请与该库联系，最有可能它将移至Android Jetpack。我在项目中开发了它们，在我看来，它们变得更好。
• 克里斯·贝恩（Chris Bane）的文章。
• FunCorn, , .
• «Why would I want to fitsSystemWindows?» .

AppConf, youtube- . , - . AppsConf , . , , stay tuned!