所以你想在低于 28 的 android API 中处理 notch(display cutout)。这太可怕了,因为不同的制造商有不同的实现。尽管如此,都使用Java 反射来获取缺口信息。这里应该使用工厂设计模式。
interface ICutout {
public boolean hasCutout();
public Rect[] getCutout();
}
华为显示屏抠图
private static class HuaweiCutout implements 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];
}}
Oppo显示屏开孔
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];
}}
Vivo显示屏镂空
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];
}}
Android Pie的 Android Oreo的小米显示屏抠图
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];
}}
如果某些制造商没有提供 getNotchHeight() 方法,您可以使用状态栏的高度。Android 已保证缺口高度最多为状态栏高度。
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 及以上(Build.VERSION.SDK_INT >= Build.VERSION_CODES.P
),您可以使用系统的 API 来获取缺口信息。请注意,必须附加窗口,Activity#onAttachedToWindow
否则您将得到空的 DisplayCutout。
DisplayCutout displayCutout = activity.getWindow().getDecorView().getRootWindowInsets().getDisplayCutout();