如何处理低于28的android API中的缺口(显示切口)?

时间:2018-08-08 09:50:07

标签: android android-appcompat android-9.0-pie androidx

Android在API 28上添加了notch支持,但是如何在运行API 27的设备(荣誉10,Huawei P20等)上处理它?

我试图使用DisplayCutoutCompat,但是由于文档并没有真正指出如何创建一个实例,因此无法创建它的实例。

如何创建构造函数参数值:Rect safeInsetsList<Rect> boundingRects

我还研究了构造函数的源代码,这让我有些困惑:

public DisplayCutoutCompat(Rect safeInsets, List<Rect> boundingRects) {
        this(SDK_INT >= 28 ? new DisplayCutout(safeInsets, boundingRects) : null);
    }

在运行 API <28 的设备上,这将始终返回null。 预先谢谢你。

4 个答案:

答案 0 :(得分:11)

Google在Android P中提供了与缺口相关的API。缺口和API版本低于P的设备会实现自己的缺口API。您可以从设备指定的文档中查阅这些API。

我在官方文档中也没有看到DisplayCutoutCompat实例的创建,但是您可以按照以下步骤创建DisplayCutout:

if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.P) {
            DisplayCutout displayCutout = getWindow().getDecorView().getRootWindowInsets().getDisplayCutout();
}

答案 1 :(得分:0)

我遇到了类似的问题,并且不得不使用反射来访问所需的内容。 我的问题是我根据屏幕尺寸进行了一些计算,虽然没有访问缺口空间,但计算错误并且代码无法正常工作。

    public static final String CLASS_DISPLAY_CUTOUT = "android.view.DisplayCutout";
    public static final String METHOD_GET_DISPLAY_CUTOUT = "getDisplayCutout";
    public static final String FIELD_GET_SAFE_INSET_TOP = "getSafeInsetTop";
    public static final String FIELD_GET_SAFE_INSET_LEFT = "getSafeInsetLeft";
    public static final String FIELD_GET_SAFE_INSET_RIGHT = "getSafeInsetRight";
    public static final String FIELD_GET_SAFE_INSET_BOTTOM = "getSafeInsetBottom";


    try {
            WindowInsets windowInsets = activity.getWindow().getDecorView().getRootWindowInsets();
            if (windowInsets == null) {
                return;
            }
            Method method = WindowInsets.class.getMethod(METHOD_GET_DISPLAY_CUTOUT);
            Object displayCutout = method.invoke(windowInsets);
            if (displayCutout == null) {
                return;
            }
            Class clz = Class.forName(CLASS_DISPLAY_CUTOUT);
            int top = (int) clz.getMethod(FIELD_GET_SAFE_INSET_TOP).invoke(displayCutout);
            int left = (int) clz.getMethod(FIELD_GET_SAFE_INSET_LEFT).invoke(displayCutout);
            int right = (int) clz.getMethod(FIELD_GET_SAFE_INSET_RIGHT).invoke(displayCutout);
            int bottom = (int) clz.getMethod(FIELD_GET_SAFE_INSET_BOTTOM).invoke(displayCutout);
            Rect rect = new Rect(left, top, right, bottom);

        } catch (Exception e) {
            Log.e(TAG, "Error when getting display cutout size");
        }

答案 2 :(得分:0)

因此,您想在低于28的android API中处理notch(显示切口)。这很糟糕,因为不同的制造商具有不同的实现。尽管如此,所有人都使用Java reflection来获得刻痕信息。 Factory design pattern应该在这里使用。

interface ICutout {
    public boolean hasCutout();

    public Rect[] getCutout();
}
  1. 华为display cutout

    私有静态类HuaweiCutout实现ICutout {

    private Context context;
    public HuaweiCutout(@NonNull Context context) {
        this.context = context;
    }
    
    @Override
    public boolean hasCutout() {
        try {
            ClassLoader classLoader = context.getClassLoader();
            Class class_HwNotchSizeUtil = classLoader.loadClass("com.huawei.android.util.HwNotchSizeUtil");
            Method method_hasNotchInScreen = class_HwNotchSizeUtil.getMethod("hasNotchInScreen");
            return (boolean) method_hasNotchInScreen.invoke(class_HwNotchSizeUtil);
        } catch (Exception e) {
        }
        return false;
    }
    
    @Override
    public Rect[] getCutout() {
        try {
            ClassLoader classLoader = context.getClassLoader();
            Class class_HwNotchSizeUtil = classLoader.loadClass("com.huawei.android.util.HwNotchSizeUtil");
            Method method_getNotchSize = class_HwNotchSizeUtil.getMethod("getNotchSize");
    
            int[] size = (int[]) method_getNotchSize.invoke(class_HwNotchSizeUtil);
            int notchWidth = size[0];
            int notchHeight = size[1];
            int screenWidth = DeviceUtil.getScreenWidth(context);
    
            int x = (screenWidth - notchWidth) >> 1;
            int y = 0;
            Rect rect = new Rect(x, y, x + notchWidth, y + notchHeight);
            return new Rect[] {rect};
        } catch (Exception e) {
        }
        return new Rect[0];
    }
    

    }

  2. Oppo display cutout

    private static class OppoCutout implements ICutout {
    
    private Context context;
    public OppoCutout(@NonNull Context context) {
        this.context = context;
    }
    
    @Override
    public boolean hasCutout() {
        String CutoutFeature = "com.oppo.feature.screen.heteromorphism";
        return context.getPackageManager().hasSystemFeature(CutoutFeature);
    }
    
    @Override
    public Rect[] getCutout() {
        String value = getProperty("ro.oppo.screen.heteromorphism");
        String[] texts = value.split("[,:]");
        int[] values = new int[texts.length];
    
        try {
            for(int i = 0; i < texts.length; ++i)
                values[i] = Integer.parseInt(texts[i]);
        } catch(NumberFormatException e) {
            values = null;
        }
    
        if(values != null && values.length == 4) {
            Rect rect   = new Rect();
            rect.left   = values[0];
            rect.top    = values[1];
            rect.right  = values[2];
            rect.bottom = values[3];
    
            return new Rect[] {rect};
        }
    
        return new Rect[0];
    }
    

    }

  3. Vivo display cutout

    private static class VivoCutout implements ICutout {
    
    private Context context;
    public VivoCutout(@NonNull Context context) {
        this.context = context;
    }
    
    @Override
    public boolean hasCutout() {
        try {
            ClassLoader clazz = context.getClassLoader();
            Class ftFeature = clazz.loadClass("android.util.FtFeature");
            Method[] methods = ftFeature.getDeclaredMethods();
            for(Method method: methods) {
                if (method.getName().equalsIgnoreCase("isFeatureSupport")) {
                    int NOTCH_IN_SCREEN = 0x00000020;  // 表示是否有凹槽
                    int ROUNDED_IN_SCREEN = 0x00000008;  // 表示是否有圆角
                    return (boolean) method.invoke(ftFeature, NOTCH_IN_SCREEN);
                }
            }
        } catch (Exception e) {
        }
        return false;
    }
    
    @Override
    public Rect[] getCutout() {
        // throw new RuntimeException();  // not implemented yet.
        return new Rect[0];
    }
    

    }

  4. 小米显示切口of Android Oreoof Android Pie

    private static class XiaomiCutout implements ICutout {
    
    private Context context;
    public XiaomiCutout(@NonNull Context context) {
        this.context = context;
    }
    
    @Override
    public boolean hasCutout() {
        // `getprop ro.miui.notch` output 1 if it's a notch screen.
        String text = getProperty("ro.miui.notch");
        return text.equals("1");
    }
    
    @Override
    public Rect[] getCutout() {
        Resources res = context.getResources();
        int widthResId = res.getIdentifier("notch_width", "dimen", "android");
        int heightResId = res.getIdentifier("notch_height", "dimen", "android");
        if(widthResId > 0 && heightResId > 0) {
            int notchWidth = res.getDimensionPixelSize(widthResId);
            int notchHeight = res.getDimensionPixelSize(heightResId);
    
            // one notch in screen top
            int screenWidth = DeviceUtil.getScreenSize(context).getWidth();
            int left = (screenWidth - notchWidth) >> 1;
            int right = left + notchWidth;
            int top = 0;
            int bottom = notchHeight;
            Rect rect = new Rect(left, top, right, bottom);
            return new Rect[] {rect};
        }
    
        return new Rect[0];
    }
    

    }

如果某些制造商不提供getNotchHeight()方法,则可以只使用状态栏的高度。 Android已保证缺口高度最多为状态栏的高度。

public static int getStatusBarHeight(Context context) {
    int statusBarHeight = 0;
    Resources res = context.getResources();
    int resourceId = res.getIdentifier("status_bar_height", "dimen", "android");
    if (resourceId > 0) {
        statusBarHeight = res.getDimensionPixelSize(resourceId);
    }
    return statusBarHeight;
}

对于Android Pie及更高版本(Build.VERSION.SDK_INT >= Build.VERSION_CODES.P),您可以使用系统的API获取缺口信息。请注意,必须附加窗口Activity#onAttachedToWindow,否则您将获得空的DisplayCutout。

DisplayCutout displayCutout = activity.getWindow().getDecorView().getRootWindowInsets().getDisplayCutout();

答案 3 :(得分:0)

要处理更低的API,则可以使用28 WindowInsetsCompat。 Kotlin示例:

WindowInsetsCompat.toWindowInsetsCompat(window.decorView.rootWindowInsets).displayCutout