Android(安卓)8.0 Navigationbar

1.控制NavigationBar显示职位

Navigationbar会随着屏幕的旋转而改变位置，或者在屏幕底部或者是在屏幕一侧，控制的mo默认的位置在PhoneWindowManager 中的navigationBarPosition（...）方法中

    private int navigationBarPosition(int displayWidth, int displayHeight, int displayRotation) {       if (mNavigationBarCanMove && displayWidth > displayHeight) {           if (displayRotation == Surface.ROTATION_270) {               return NAV_BAR_LEFT;           } else {               return NAV_BAR_RIGHT;           }       }       return NAV_BAR_BOTTOM;

可以自行修改，设置默认显示的位置。

2.改变Navigationbar 显示的buttom

修改frameworks/base/packages/SystemUI/res/values-sw600dp/config.xml中的config_navBarLayout值即可进行添加

        left;back,home,recent;right

3.扩展navigationbar

3.1首先修改config_navBarLayout的值，加入你要添加的字符串

3.2 修改frameworks/base/packages/SystemUI/src/com/android/systemui/statusbar/phone/NavigationBarInflaterView.java中的private View createView(String buttonSpec, ViewGroup parent, LayoutInflater inflater) {}方法在里面加入需要的字段判断，引入需要的布局文件(举例引入test.xml)

private View createView(String buttonSpec, ViewGroup parent, LayoutInflater inflater) {        View v = null;        String button = extractButton(buttonSpec);        if (LEFT.equals(button)) {            String s = Dependency.get(TunerService.class).getValue(NAV_BAR_LEFT, NAVSPACE);            button = extractButton(s);        } else if (RIGHT.equals(button)) {            String s = Dependency.get(TunerService.class).getValue(NAV_BAR_RIGHT, MENU_IME);            button = extractButton(s);        }        // Let plugins go first so they can override a standard view if they want.        for (NavBarButtonProvider provider : mPlugins) {            v = provider.createView(buttonSpec, parent);            if (v != null) return v;        }        if (HOME.equals(button)) {            v = inflater.inflate(R.layout.home, parent, false);        } else if (BACK.equals(button)) {            v = inflater.inflate(R.layout.back, parent, false);        } else if (RECENT.equals(button)) {            v = inflater.inflate(R.layout.recent_apps, parent, false);        } else if (Test.equals(button)) {            v = inflater.inflate(R.layout.test, parent, false);        } else if (MENU_IME.equals(button)) {            v = inflater.inflate(R.layout.menu_ime, parent, false);        } else if (NAVSPACE.equals(button)) {            v = inflater.inflate(R.layout.nav_key_space, parent, false);        } else if (CLIPBOARD.equals(button)) {            v = inflater.inflate(R.layout.clipboard, parent, false);        } else if (button.startsWith(KEY)) {            String uri = extractImage(button);            int code = extractKeycode(button);            v = inflater.inflate(R.layout.custom_key, parent, false);            ((KeyButtonView) v).setCode(code);            if (uri != null) {                if (uri.contains(":")) {                    ((KeyButtonView) v).loadAsync(Icon.createWithContentUri(uri));                } else if (uri.contains("/")) {                    int index = uri.indexOf('/');                    String pkg = uri.substring(0, index);                    int id = Integer.parseInt(uri.substring(index + 1));                    ((KeyButtonView) v).loadAsync(Icon.createWithResource(pkg, id));                }            }        }        return v;    }

4.注意

KeyButtonView.java 中会有private final KeyButtonRipple mRipple; 这个是点击NavigationBar buttom时有一个扩大光圈的效果，注释掉即可取消

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