Android獲取屏幕狀態的方式

在這裏記錄Android獲取當前屏幕狀態的方式。

一、通過Display類中的getState方法獲得，代碼如下

WindowManager windowManager = (WindowManager) mContext.getSystemService(WINDOW_SERVICE);
Display display = windowManager.getDefaultDisplay();
    /**
     * Gets the state of the display, such as whether it is on or off.
     *
     * @return The state of the display: one of {@link #STATE_OFF}, {@link #STATE_ON},
     * {@link #STATE_DOZE}, {@link #STATE_DOZE_SUSPEND}, or {@link #STATE_UNKNOWN}.
     */
int screenState = display.getState();

二、通過接收廣播獲取
在屏幕狀態變化（On/Off）時候，系統會發出廣播，可以通過註冊廣播，進行判斷當前屏幕狀態。
可以接收如下兩個廣播ACTION_SCREEN_OFF 和 ACTION_SCREEN_ON：

   /**
     * Broadcast Action: Sent when the device goes to sleep and becomes non-interactive.
     * <p>
     * For historical reasons, the name of this broadcast action refers to the power
     * state of the screen but it is actually sent in response to changes in the
     * overall interactive state of the device.
     * </p><p>
     * This broadcast is sent when the device becomes non-interactive which may have
     * nothing to do with the screen turning off.  To determine the
     * actual state of the screen, use {@link android.view.Display#getState}.
     * </p><p>
     * See {@link android.os.PowerManager#isInteractive} for details.
     * </p>
     * You <em>cannot</em> receive this through components declared in
     * manifests, only by explicitly registering for it with
     * {@link Context#registerReceiver(BroadcastReceiver, IntentFilter)
     * Context.registerReceiver()}.
     *
     * <p class="note">This is a protected intent that can only be sent
     * by the system.
     */
    @SdkConstant(SdkConstantType.BROADCAST_INTENT_ACTION)
    public static final String ACTION_SCREEN_OFF = "android.intent.action.SCREEN_OFF";

    /**
     * Broadcast Action: Sent when the device wakes up and becomes interactive.
     * <p>
     * For historical reasons, the name of this broadcast action refers to the power
     * state of the screen but it is actually sent in response to changes in the
     * overall interactive state of the device.
     * </p><p>
     * This broadcast is sent when the device becomes interactive which may have
     * nothing to do with the screen turning on.  To determine the
     * actual state of the screen, use {@link android.view.Display#getState}.
     * </p><p>
     * See {@link android.os.PowerManager#isInteractive} for details.
     * </p>
     * You <em>cannot</em> receive this through components declared in
     * manifests, only by explicitly registering for it with
     * {@link Context#registerReceiver(BroadcastReceiver, IntentFilter)
     * Context.registerReceiver()}.
     *
     * <p class="note">This is a protected intent that can only be sent
     * by the system.
     */
    @SdkConstant(SdkConstantType.BROADCAST_INTENT_ACTION)
    public static final String ACTION_SCREEN_ON = "android.intent.action.SCREEN_ON";

目前知道這兩種，發現別的方式再補充，歡迎高手指教～