Android充分利用系统状态栏，达到全屏显示，fitSystemWindow失效问题

先是配置Activity的style设置

<style name="Full_Used_status_bar" parent="Theme.AppCompat.Light.NoActionBar">"android:windowTranslucentStatus">true"android:statusBarColor">@android:color/transparentstyle>

android:windowTranslucentStatus 允许把状态栏当作布局位置使用
android:statusBarColor 是决定状态栏背景颜色，当设置为透明时能达到预期效果

重写ViewGroup或者索要用的每一个Layout，
目的是：当新的子view添加到Layout时新的任务把inset传递给每一个子view
such as the FrameLayout bellow:

public class MyFramLayout extends FrameLayout {    public MyFramLayout(@NonNull Context context) {        super(context);    }    public MyFramLayout(@NonNull Context context, @Nullable AttributeSet attrs) {        super(context, attrs);    }    public MyFramLayout(@NonNull Context context, @Nullable AttributeSet attrs, int defStyleAttr) {        super(context, attrs, defStyleAttr);    }    public MyFramLayout(@NonNull Context context, @Nullable AttributeSet attrs, int defStyleAttr, int defStyleRes) {        super(context, attrs, defStyleAttr, defStyleRes);    }    public void init(){        setOnHierarchyChangeListener(new OnHierarchyChangeListener() {            @Override            public void onChildViewAdded(View parent, View child) {                requestApplyInsets();            }            @Override            public void onChildViewRemoved(View parent, View child) {            }        });    }    @Override    public WindowInsets dispatchApplyWindowInsets(WindowInsets insets) {        for(int index=0;index<getChildCount();index++){            getChildAt(index).dispatchApplyWindowInsets(insets);        }        return insets;    }}

下面是ConstraintLayout的重写：

public class MyConstraintLayout extends ConstraintLayout {    public MyConstraintLayout(Context context) {        super(context);        init();    }    public MyConstraintLayout(Context context, AttributeSet attrs) {        super(context, attrs);        init();    }    public MyConstraintLayout(Context context, AttributeSet attrs, int defStyleAttr) {        super(context, attrs, defStyleAttr);        init();    }    public void init(){        setOnHierarchyChangeListener(new ViewGroup.OnHierarchyChangeListener() {            @Override            public void onChildViewAdded(View parent, View child) {                requestApplyInsets();            }            @Override            public void onChildViewRemoved(View parent, View child) {            }        });    }    @Override    public WindowInsets dispatchApplyWindowInsets(WindowInsets insets) {        for(int index=0;index<getChildCount();index++){            getChildAt(index).dispatchApplyWindowInsets(insets);        }        return insets;    }}

fitSystemWindow的详细介绍：

fitsystemwindow：false时：按钮什么的都跑到状态栏下面去了

当fitsystemwindow：true时：除了背景以外的的都从状态栏下界开始布局

最后：
notice:别忘了给状态栏字题设置颜色：只有亮色和暗色两种，当背景颜色偏亮时设置成暗色，当背景颜色偏暗时设置成亮色。
设置成暗色：

window.getDecorView().setSystemUiVisibility(View.SYSTEM_UI_FLAG_LIGHT_STATUS_BAR)

设置成亮色：

window.getDecorView().setSystemUiVisibility(0)

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