整理一個屏幕工具類，

public class ScreenUtils {

    private ScreenUtils() {
        throw new UnsupportedOperationException("u can't fuck me...");
    }

    /**
     * 獲取屏幕的寬度px
     *
     * @param context 上下文
     * @return 屏幕寬px
     */
    public static int getScreenWidth(Context context) {
        WindowManager windowManager = (WindowManager) context.getSystemService(Context.WINDOW_SERVICE);
        DisplayMetrics outMetrics = new DisplayMetrics();// 創建了一張白紙
        windowManager.getDefaultDisplay().getMetrics(outMetrics);// 給白紙設置寬高
        return outMetrics.widthPixels;
    }

    /**
     * 獲取屏幕的高度px
     *
     * @param context 上下文
     * @return 屏幕高px
     */
    public static int getScreenHeight(Context context) {
        WindowManager windowManager = (WindowManager) context.getSystemService(Context.WINDOW_SERVICE);
        DisplayMetrics outMetrics = new DisplayMetrics();// 創建了一張白紙
        windowManager.getDefaultDisplay().getMetrics(outMetrics);// 給白紙設置寬高
        return outMetrics.heightPixels;
    }

    /**
     * 設置透明狀態欄(api大於19方可使用)
     * <p>可在Activity的onCreat()中調用</p>
     * <p>需在頂部控件佈局中加入以下屬性讓內容出現在狀態欄之下</p>
     * <p>android:clipToPadding="true"</p>
     * <p>android:fitsSystemWindows="true"</p>
     *
     * @param activity activity
     */
    public static void setTransparentStatusBar(Activity activity) {
        if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.KITKAT) {
            //透明狀態欄
            activity.getWindow().addFlags(LayoutParams.FLAG_TRANSLUCENT_STATUS);
            //透明導航欄
            //activity.getWindow().addFlags(LayoutParams.FLAG_TRANSLUCENT_NAVIGATION);

        }
    }

    /**
     * 隱藏狀態欄
     * <p>也就是設置全屏，一定要在setContentView之前調用，否則報錯</p>
     * <p>此方法Activity可以繼承AppCompatActivity</p>
     * <p>啓動的時候狀態欄會顯示一下再隱藏，比如QQ的歡迎界面</p>
     * <p>在配置文件中Activity加屬性android:theme="@android:style/Theme.NoTitleBar.Fullscreen"</p>
     * <p>如加了以上配置Activity不能繼承AppCompatActivity，會報錯</p>
     *
     * @param activity activity
     */
    public static void hideStatusBar(Activity activity) {
        activity.requestWindowFeature(Window.FEATURE_NO_TITLE);
        activity.getWindow().setFlags(LayoutParams.FLAG_FULLSCREEN,
                LayoutParams.FLAG_FULLSCREEN);
    }

    /**
     * 獲取狀態欄高度
     *
     * @param context 上下文
     * @return 狀態欄高度
     */
    public static int getStatusBarHeight(Context context) {
        int result = 0;
        int resourceId = context.getResources()
                .getIdentifier("status_bar_height", "dimen", "android");
        if (resourceId > 0) {
            result = context.getResources().getDimensionPixelSize(resourceId);
        }
        return result;
    }

    /**
     * 判斷狀態欄是否存在
     *
     * @param activity activity
     * @return {@code true}: 存在<br>{@code false}: 不存在
     */
    public static boolean isStatusBarExists(Activity activity) {
        LayoutParams params = activity.getWindow().getAttributes();
        return (params.flags & LayoutParams.FLAG_FULLSCREEN) != LayoutParams.FLAG_FULLSCREEN;
    }

    /**
     * 獲取ActionBar高度
     *
     * @param activity activity
     * @return ActionBar高度
     */
    public static int getActionBarHeight(Activity activity) {
        TypedValue tv = new TypedValue();
        if (activity.getTheme().resolveAttribute(android.R.attr.actionBarSize, tv, true)) {
            return TypedValue.complexToDimensionPixelSize(tv.data, activity.getResources().getDisplayMetrics());
        }
        return 0;
    }

    /**
     * 顯示通知欄
     * <p>需添加權限 {@code <uses-permission android:name="android.permission.EXPAND_STATUS_BAR"/>}</p>
     *
     * @param context        上下文
     * @param isSettingPanel {@code true}: 打開設置<br>{@code false}: 打開通知
     */
    public static void showNotificationBar(Context context, boolean isSettingPanel) {
        String methodName = (Build.VERSION.SDK_INT <= 16) ? "expand"
                : (isSettingPanel ? "expandSettingsPanel" : "expandNotificationsPanel");
        invokePanels(context, methodName);
    }

    /**
     * 隱藏通知欄
     * <p>需添加權限 {@code <uses-permission android:name="android.permission.EXPAND_STATUS_BAR"/>}</p>
     *
     * @param context 上下文
     */
    public static void hideNotificationBar(Context context) {
        String methodName = (Build.VERSION.SDK_INT <= 16) ? "collapse" : "collapsePanels";
        invokePanels(context, methodName);
    }

    /**
     * 反射喚醒通知欄
     *
     * @param context    上下文
     * @param methodName 方法名
     */
    private static void invokePanels(Context context, String methodName) {
        try {
            Object service = context.getSystemService("statusbar");
            Class<?> statusBarManager = Class.forName("android.app.StatusBarManager");
            Method expand = statusBarManager.getMethod(methodName);
            expand.invoke(service);
        } catch (Exception e) {
            e.printStackTrace();
        }
    }

    /**
     * 設置屏幕爲橫屏
     * <p>還有一種就是在Activity中加屬性android:screenOrientation="landscape"</p>
     * <p>不設置Activity的android:configChanges時，切屏會重新調用各個生命週期，切橫屏時會執行一次，切豎屏時會執行兩次</p>
     * <p>設置Activity的android:configChanges="orientation"時，切屏還是會重新調用各個生命週期，切橫、豎屏時只會執行一次</p>
     * <p>設置Activity的android:configChanges="orientation|keyboardHidden|screenSize"（4.0以上必須帶最後一個參數）時
     * 切屏不會重新調用各個生命週期，只會執行onConfigurationChanged方法</p>
     *
     * @param activity activity
     */
    public static void setLandscape(Activity activity) {
        activity.setRequestedOrientation(ActivityInfo.SCREEN_ORIENTATION_LANDSCAPE);
    }

    /**
     * 獲取當前屏幕截圖，包含狀態欄
     *
     * @param activity activity
     * @return Bitmap
     */
    public static Bitmap captureWithStatusBar(Activity activity) {
        View view = activity.getWindow().getDecorView();
        view.setDrawingCacheEnabled(true);
        view.buildDrawingCache();
        Bitmap bmp = view.getDrawingCache();
        int width = getScreenWidth(activity);
        int height = getScreenHeight(activity);
        Bitmap bp = Bitmap.createBitmap(bmp, 0, 0, width, height);
        view.destroyDrawingCache();
        return bp;
    }

    /**
     * 獲取當前屏幕截圖，不包含狀態欄
     * <p>需要用到上面獲取狀態欄高度getStatusBarHeight的方法</p>
     *
     * @param activity activity
     * @return Bitmap
     */
    public static Bitmap captureWithoutStatusBar(Activity activity) {
        View view = activity.getWindow().getDecorView();
        view.setDrawingCacheEnabled(true);
        view.buildDrawingCache();
        Bitmap bmp = view.getDrawingCache();
        int statusBarHeight = getStatusBarHeight(activity);
        int width = getScreenWidth(activity);
        int height = getScreenHeight(activity);
        Bitmap bp = Bitmap.createBitmap(bmp, 0, statusBarHeight, width, height - statusBarHeight);
        view.destroyDrawingCache();
        return bp;
    }

    /**
     * 判斷是否鎖屏
     *
     * @param context 上下文
     * @return {@code true}: 是<br>{@code false}: 否
     */
    public static boolean isScreenLock(Context context) {
        KeyguardManager km = (KeyguardManager) context
                .getSystemService(Context.KEYGUARD_SERVICE);
        return km.inKeyguardRestrictedInputMode();
    }