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      1 package com.android.nfc;
      2 
      3 import android.app.KeyguardManager;
      4 import android.content.Context;
      5 import android.os.PowerManager;
      6 
      7 /**
      8  * Helper class for determining the current screen state for NFC activities.
      9  */
     10 class ScreenStateHelper {
     11 
     12     static final int SCREEN_STATE_UNKNOWN = 0x00;
     13     static final int SCREEN_STATE_OFF_UNLOCKED = 0x01;
     14     static final int SCREEN_STATE_OFF_LOCKED = 0x02;
     15     static final int SCREEN_STATE_ON_LOCKED = 0x04;
     16     static final int SCREEN_STATE_ON_UNLOCKED = 0x08;
     17 
     18     //Polling mask
     19     static final int SCREEN_POLLING_TAG_MASK = 0x10;
     20     static final int SCREEN_POLLING_P2P_MASK = 0x20;
     21     static final int SCREEN_POLLING_READER_MASK = 0x40;
     22 
     23     private final PowerManager mPowerManager;
     24     private final KeyguardManager mKeyguardManager;
     25 
     26     ScreenStateHelper(Context context) {
     27         mKeyguardManager = (KeyguardManager)
     28                 context.getSystemService(Context.KEYGUARD_SERVICE);
     29         mPowerManager = (PowerManager) context.getSystemService(Context.POWER_SERVICE);
     30     }
     31 
     32     int checkScreenState() {
     33         //TODO: fix deprecated api
     34         if (!mPowerManager.isScreenOn()) {
     35             if(mKeyguardManager.isKeyguardLocked()) {
     36                 return SCREEN_STATE_OFF_LOCKED;
     37             } else {
     38                 return SCREEN_STATE_OFF_UNLOCKED;
     39             }
     40         } else if (mKeyguardManager.isKeyguardLocked()) {
     41             return SCREEN_STATE_ON_LOCKED;
     42         } else {
     43             return SCREEN_STATE_ON_UNLOCKED;
     44         }
     45     }
     46 
     47     /**
     48      * For debugging only - no i18n
     49      */
     50     static String screenStateToString(int screenState) {
     51         switch (screenState) {
     52             case SCREEN_STATE_OFF_LOCKED:
     53                 return "OFF_LOCKED";
     54             case SCREEN_STATE_ON_LOCKED:
     55                 return "ON_LOCKED";
     56             case SCREEN_STATE_ON_UNLOCKED:
     57                 return "ON_UNLOCKED";
     58             case SCREEN_STATE_OFF_UNLOCKED:
     59                 return "OFF_UNLOCKED";
     60             default:
     61                 return "UNKNOWN";
     62         }
     63     }
     64 }
     65