Lock orientation for yubikey operations

OpenKeychain/src/main/java/org/sufficientlysecure/keychain/ui/NfcOperationActivity.java

@@ -21,6 +21,7 @@
 package org.sufficientlysecure.keychain.ui;
 
 import android.content.Intent;
+import android.content.pm.ActivityInfo;
 import android.os.AsyncTask;
 import android.os.Bundle;
 import android.view.View;
@@ -42,6 +43,7 @@ import org.sufficientlysecure.keychain.service.input.RequiredInputParcel;
 import org.sufficientlysecure.keychain.ui.base.BaseNfcActivity;
 import org.sufficientlysecure.keychain.ui.util.ThemeChanger;
 import org.sufficientlysecure.keychain.util.Log;
+import org.sufficientlysecure.keychain.util.OrientationUtils;
 import org.sufficientlysecure.keychain.util.Passphrase;
 import org.sufficientlysecure.keychain.util.Preferences;
 
@@ -92,6 +94,9 @@ public class NfcOperationActivity extends BaseNfcActivity {
         super.onCreate(savedInstanceState);
         Log.d(Constants.TAG, "NfcOperationActivity.onCreate");
 
+        // prevent annoying orientation changes while fumbling with the device
+        OrientationUtils.lockOrientation(this);
+
         getWindow().addFlags(WindowManager.LayoutParams.FLAG_KEEP_SCREEN_ON);
 
         mInputParcel = getIntent().getParcelableExtra(EXTRA_CRYPTO_INPUT);

OpenKeychain/src/main/java/org/sufficientlysecure/keychain/util/OrientationUtils.java

@@ -0,0 +1,85 @@
+/*
+ * Copyright (C) 2015 Dominik Schürmann <dominik@dominikschuermann.de>
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ */
+
+package org.sufficientlysecure.keychain.util;
+
+import android.app.Activity;
+import android.content.Context;
+import android.content.pm.ActivityInfo;
+import android.content.res.Configuration;
+import android.view.Display;
+import android.view.Surface;
+import android.view.WindowManager;
+
+/**
+ * Static methods related to device orientation.
+ */
+public class OrientationUtils {
+
+    /**
+     * Locks the device window in landscape mode.
+     */
+    public static void lockOrientationLandscape(Activity activity) {
+        activity.setRequestedOrientation(ActivityInfo.SCREEN_ORIENTATION_LANDSCAPE);
+    }
+
+    /**
+     * Locks the device window in portrait mode.
+     */
+    public static void lockOrientationPortrait(Activity activity) {
+        activity.setRequestedOrientation(ActivityInfo.SCREEN_ORIENTATION_PORTRAIT);
+    }
+
+    /**
+     * Locks the device window in actual screen mode.
+     */
+    public static void lockOrientation(Activity activity) {
+        Display display = ((WindowManager) activity.getSystemService(Context.WINDOW_SERVICE))
+                .getDefaultDisplay();
+        int rotation = display.getRotation();
+        int tempOrientation = activity.getResources().getConfiguration().orientation;
+        int orientation = ActivityInfo.SCREEN_ORIENTATION_UNSPECIFIED;
+
+        switch (tempOrientation) {
+            case Configuration.ORIENTATION_LANDSCAPE: {
+                if (rotation == Surface.ROTATION_0 || rotation == Surface.ROTATION_90) {
+                    orientation = ActivityInfo.SCREEN_ORIENTATION_LANDSCAPE;
+                } else {
+                    orientation = ActivityInfo.SCREEN_ORIENTATION_REVERSE_LANDSCAPE;
+                }
+                break;
+            }
+            case Configuration.ORIENTATION_PORTRAIT: {
+                if (rotation == Surface.ROTATION_0 || rotation == Surface.ROTATION_270) {
+                    orientation = ActivityInfo.SCREEN_ORIENTATION_PORTRAIT;
+                } else {
+                    orientation = ActivityInfo.SCREEN_ORIENTATION_REVERSE_PORTRAIT;
+                }
+                break;
+            }
+        }
+        activity.setRequestedOrientation(orientation);
+    }
+
+    /**
+     * Unlocks the device window in user defined screen mode.
+     */
+    public static void unlockOrientation(Activity activity) {
+        activity.setRequestedOrientation(ActivityInfo.SCREEN_ORIENTATION_USER);
+    }
+
+}