Warning notification when password attempt fails

Shows a notification of the form "Password entered incorrectly X times"
and "User is set to wipe after Y attempts" which is updated after each
failed password attempt.

Change-Id: I57ef893681d2883195ce009a84382a011436aa7b

Author: hex539

app/src/main/java/com/afwsamples/testdpc/DeviceAdminReceiver.java

@@ -59,6 +59,7 @@ public class DeviceAdminReceiver extends android.app.admin.DeviceAdminReceiver {
             "com.afwsamples.testdpc.policy.PASSWORD_REQUIREMENTS_CHANGED";
 
     private static final int CHANGE_PASSWORD_NOTIFICATION_ID = 101;
+    private static final int PASSWORD_FAILED_NOTIFICATION_ID = 102;
 
     @Override
     public void onReceive(Context context, Intent intent) {
@@ -235,6 +236,45 @@ public static ComponentName getComponentName(Context context) {
         return new ComponentName(context.getApplicationContext(), DeviceAdminReceiver.class);
     }
 
+    @Override
+    public void onPasswordFailed(Context context, Intent intent) {
+        DevicePolicyManager devicePolicyManager = (DevicePolicyManager) context.getSystemService(
+                Context.DEVICE_POLICY_SERVICE);
+        /*
+         * Post a notification to show:
+         *  - how many wrong passwords have been entered;
+         *  - how many wrong passwords need to be entered for the device to be wiped.
+         */
+        int attempts = devicePolicyManager.getCurrentFailedPasswordAttempts();
+        int maxAttempts = devicePolicyManager.getMaximumFailedPasswordsForWipe(null);
+
+        String title = context.getQuantityString(
+                R.plurals.password_failed_attempts_title, attempts, attempts);
+        String content = maxAttempts == 0
+                ? context.getString(R.string.password_failed_no_limit_set)
+                : context.getQuantityString(
+                        R.plurals.password_failed_attempts_content, maxAttempts, maxAttempts);
+
+        Notification.Builder warn = new Notification.Builder(context)
+                .setSmallIcon(R.drawable.ic_launcher)
+                .setTicker(title)
+                .setContentTitle(title)
+                .setContentText(content)
+                .setContentIntent(PendingIntent.getActivity(context, /* requestCode */ -1,
+                        new Intent(DevicePolicyManager.ACTION_SET_NEW_PASSWORD), /* flags */ 0));
+
+        NotificationManager nm = (NotificationManager)
+                context.getSystemService(Context.NOTIFICATION_SERVICE);
+        nm.notify(PASSWORD_FAILED_NOTIFICATION_ID, warn.getNotification());
+    }
+
+    @Override
+    public void onPasswordSucceeded(Context context, Intent intent) {
+        NotificationManager nm = (NotificationManager)
+                context.getSystemService(Context.NOTIFICATION_SERVICE);
+        nm.cancel(PASSWORD_FAILED_NOTIFICATION_ID);
+    }
+
     @Override
     public void onPasswordChanged(Context context, Intent intent) {
         updatePasswordQualityNotification(context);

app/src/main/res/values/strings.xml

@@ -479,6 +479,16 @@
     <string name="password_not_compliant_title">Password is not compliant</string>
     <string name="password_not_compliant_content">Touch to set a new lock screen password.</string>
 
+    <plurals name="password_failed_attempts_title">
+        <item quantity="one">Password entered incorrectly %d time</item>
+        <item quantity="other">Password entered incorrectly %d times</item>
+    </plurals>
+    <plurals name="password_failed_attempts_content">
+        <item quantity="one">Set to wipe after %d attempt.</item>
+        <item quantity="other">Set to wipe after %d attempts.</item>
+    </plurals>
+    <string name="password_failed_no_limit_set">No limit set on failed password attempts.</string>
+
     <!-- Strings for managing Settings -->
     <string name="settings_management_title">Settings management</string>
     <string name="stay_on_while_plugged_in">Keep the device on while plugged in</string>