Android Open Source - nfcunlocker Keyguard Unlock

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License

The source code is released under:
Apache License
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Java Source Code

package com.steelrat.nfcunlocker.unlockmethods;
/*  w  w w. j av a  2 s. c o m*/
import android.app.Activity;
import android.app.KeyguardManager;
import android.app.KeyguardManager.KeyguardLock;
import android.app.Service;
import android.content.BroadcastReceiver;
import android.content.Context;
import android.content.Intent;
import android.content.IntentFilter;
import android.os.IBinder;
import android.util.Log;

/**
 * Screen unlock method that uses KeyguardLock class to dismiss/re-enable keyguard and 
 * DevicePolicyManager to clear/set password.
 * 
 * <h3>How does this works:</h3>
 * <ol>
 * <li>Clear the password and disable keyguard using KeyguardLock.disableKeyguard() method.
 * We are clearing the password because without this action if we will try to switch to another
 * app - keyguard will appear.
 * <li>Launch service that will register and control broadcast receiver for Screen Off action.
 * <li>When Screen Off action is received then we are re-enabling keyguard and setting password back.
 * </ol>
 * 
 * @author SteelRat
 *
 */
public class KeyguardUnlock extends DevicePolicyUnlockMethod {
  static KeyguardLock mKeyguardLock;
  
  public KeyguardUnlock(Activity activity) {
    super(activity);
  }
  
  public void unlock(String password) {
    super.unlock(password);
      
    Context context = getActivity();
    
    // Clear password and disable keyguard.
    clearPassword();
    getKeyguardLock(context).disableKeyguard();

    // Launch service that will host broadcast receiver for screen off action.
    Intent i = new Intent(context, KeyguardService.class);
        i.setAction(KeyguardService.ACTION_INIT);
    i.putExtra("password", password);
        context.startService(i);
  }
  
  @Override
  public void onActivityEvent(String event) {
    super.onActivityEvent(event);
    
    // We can finish activity just after unlock.
    if (event.equals("onCreate")) {             
      getActivity().finish();
    }
  }
  
  @Override
  public void onDeactivate() {
    super.onDeactivate();

    // Stop service that may running.
    Intent i = new Intent(getActivity(), KeyguardService.class);
    i.setAction("");
    getActivity().stopService(i);
  }
  
  private static KeyguardLock getKeyguardLock(Context context) {
    if (mKeyguardLock == null) {
      KeyguardManager keyguardManager = (KeyguardManager) context.getSystemService(Activity.KEYGUARD_SERVICE);  
          
      mKeyguardLock = keyguardManager.newKeyguardLock("nfcunlocker");
    }
        
    return mKeyguardLock;
  }
  
  public static class KeyguardService extends Service {
    BroadcastReceiver mReceiver;
    String mPassword;
    public static final String ACTION_INIT = "com.steelrat.nfcunlocker.unlockmethods.ACTION_INIT";
    public static final String ACTION_LOCK = "com.steelrat.nfcunlocker.unlockmethods.ACTION_LOCK";
    
      @Override
    public int onStartCommand(Intent intent, int flags, int startId) {
        String action = intent.getAction();
        
        // Create new broadcast receiver for screen off action.
      if (action.equals(ACTION_INIT)) {
        mPassword = intent.getStringExtra("password");
        mReceiver = new ScreenReceiver();
        IntentFilter filter = new IntentFilter(Intent.ACTION_SCREEN_OFF);
            registerReceiver(mReceiver, filter);
      } else if (action.equals(ACTION_LOCK)) {
        stopSelf();
      }

      // Don't restart service after kill. Keyguard will be re-enabled in
      // onDestroy automatically.
      return START_NOT_STICKY;
    }
      
      @Override
      public void onDestroy() {
        super.onDestroy();

        restoreKeygurad();
        
        if (mReceiver != null) {
          unregisterReceiver(mReceiver);
        }
      }
    
      private void restoreKeygurad() {
        // Re-enable keyguard and set password back.
      getKeyguardLock(this).reenableKeyguard();
      KeyguardUnlock.setPassword(this, mPassword);
      }
      
    private class ScreenReceiver extends BroadcastReceiver {    
      @Override
      public void onReceive(Context context, Intent intent) {
        // Send message to service to re-lock screen.
        Intent i = new Intent(context, KeyguardService.class);
            i.setAction(KeyguardService.ACTION_LOCK);
            context.startService(i);
      }
    }
    
    @Override
    public IBinder onBind(Intent intent) {
      return null;
    }
  }
}
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