add back button to wizard fragments

OpenKeychain/src/main/java/org/sufficientlysecure/keychain/ui/affirmations/AffirmationCreateDnsStep1Fragment.java

@@ -84,6 +84,13 @@ public class AffirmationCreateDnsStep1Fragment extends Fragment {
             }
         });
 
+        view.findViewById(R.id.back_button).setOnClickListener(new View.OnClickListener() {
+            @Override
+            public void onClick(View v) {
+                mAffirmationWizard.loadFragment(null, null, AffirmationWizard.FRAG_ACTION_TO_LEFT);
+            }
+        });
+
         mEditUri = (EditText) view.findViewById(R.id.affirmation_create_https_uri);
 
         mEditUri.addTextChangedListener(new TextWatcher() {

OpenKeychain/src/main/java/org/sufficientlysecure/keychain/ui/affirmations/AffirmationCreateHttpsStep1Fragment.java

@@ -84,6 +84,13 @@ public class AffirmationCreateHttpsStep1Fragment extends Fragment {
             }
         });
 
+        view.findViewById(R.id.back_button).setOnClickListener(new View.OnClickListener() {
+            @Override
+            public void onClick(View v) {
+                mAffirmationWizard.loadFragment(null, null, AffirmationWizard.FRAG_ACTION_TO_LEFT);
+            }
+        });
+
         mEditUri = (EditText) view.findViewById(R.id.affirmation_create_https_uri);
 
         mEditUri.addTextChangedListener(new TextWatcher() {

OpenKeychain/src/main/java/org/sufficientlysecure/keychain/ui/affirmations/AffirmationCreateHttpsStep2Fragment.java

@@ -99,6 +99,13 @@ public class AffirmationCreateHttpsStep2Fragment extends Fragment {
             }
         });
 
+        view.findViewById(R.id.back_button).setOnClickListener(new View.OnClickListener() {
+            @Override
+            public void onClick(View v) {
+                mAffirmationWizard.loadFragment(null, null, AffirmationWizard.FRAG_ACTION_TO_LEFT);
+            }
+        });
+
         mVerifyImage = (ImageView) view.findViewById(R.id.verify_image);
         mVerifyProgress = view.findViewById(R.id.verify_progress);
         mVerifyStatus = (TextView) view.findViewById(R.id.verify_status);

OpenKeychain/src/main/java/org/sufficientlysecure/keychain/ui/affirmations/AffirmationCreateTwitterStep1Fragment.java

@@ -111,6 +111,13 @@ public class AffirmationCreateTwitterStep1Fragment extends Fragment {
             }
         });
 
+        view.findViewById(R.id.back_button).setOnClickListener(new View.OnClickListener() {
+            @Override
+            public void onClick(View v) {
+                mAffirmationWizard.loadFragment(null, null, AffirmationWizard.FRAG_ACTION_TO_LEFT);
+            }
+        });
+
         mEditHandle = (EditText) view.findViewById(R.id.linked_create_twitter_handle);
         mEditHandle.setText("Valodim");
 

OpenKeychain/src/main/java/org/sufficientlysecure/keychain/ui/affirmations/AffirmationCreateTwitterStep2Fragment.java

@@ -86,6 +86,13 @@ public class AffirmationCreateTwitterStep2Fragment extends Fragment {
             }
         });
 
+        view.findViewById(R.id.back_button).setOnClickListener(new View.OnClickListener() {
+            @Override
+            public void onClick(View v) {
+                mAffirmationWizard.loadFragment(null, null, AffirmationWizard.FRAG_ACTION_TO_LEFT);
+            }
+        });
+
         mVerifyImage = (ImageView) view.findViewById(R.id.verify_image);
         mVerifyProgress = view.findViewById(R.id.verify_progress);
         mVerifyStatus = (TextView) view.findViewById(R.id.verify_status);

OpenKeychain/src/main/java/org/sufficientlysecure/keychain/ui/affirmations/AffirmationCreateTwitterStep3Fragment.java

@@ -101,6 +101,13 @@ public class AffirmationCreateTwitterStep3Fragment extends Fragment {
         mEditTweetPreview = (EditText) view.findViewById(R.id.linked_create_twitter_preview);
         mEditTweetPreview.setText(mFullString);
 
+        view.findViewById(R.id.back_button).setOnClickListener(new View.OnClickListener() {
+            @Override
+            public void onClick(View v) {
+                mAffirmationWizard.loadFragment(null, null, AffirmationWizard.FRAG_ACTION_TO_LEFT);
+            }
+        });
+
         view.findViewById(R.id.button_send).setOnClickListener(new OnClickListener() {
             @Override
             public void onClick(View v) {

OpenKeychain/src/main/res/layout/affirmation_create_dns_fragment_step1.xml

@@ -82,14 +82,16 @@
         android:id="@+id/create_key_buttons">
 
         <TextView
-            android:id="@+id/create_key_back_button"
+            android:id="@+id/back_button"
             android:paddingLeft="8dp"
             android:paddingRight="8dp"
             android:textAppearance="?android:attr/textAppearanceMedium"
             android:layout_width="match_parent"
             android:layout_height="wrap_content"
             android:layout_weight="1"
-            android:text=""
+            android:text="@string/btn_back"
+            android:clickable="true"
+            style="@style/SelectableItem"
             android:minHeight="?android:attr/listPreferredItemHeight"
             android:gravity="center_vertical"
             android:layout_gravity="center_vertical" />

OpenKeychain/src/main/res/layout/affirmation_create_https_fragment_step1.xml

@@ -97,14 +97,16 @@
         android:id="@+id/create_key_buttons">
 
         <TextView
-            android:id="@+id/create_key_back_button"
+            android:id="@+id/back_button"
             android:paddingLeft="8dp"
             android:paddingRight="8dp"
             android:textAppearance="?android:attr/textAppearanceMedium"
             android:layout_width="match_parent"
             android:layout_height="wrap_content"
             android:layout_weight="1"
-            android:text=""
+            android:text="@string/btn_back"
+            android:clickable="true"
+            style="@style/SelectableItem"
             android:minHeight="?android:attr/listPreferredItemHeight"
             android:gravity="center_vertical"
             android:layout_gravity="center_vertical" />

OpenKeychain/src/main/res/layout/affirmation_create_https_fragment_step2.xml

@@ -149,15 +149,17 @@
         android:id="@+id/create_key_buttons">
 
         <TextView
-            android:id="@+id/create_key_back_button"
+            android:id="@+id/back_button"
             android:paddingLeft="8dp"
             android:paddingRight="8dp"
             android:textAppearance="?android:attr/textAppearanceMedium"
             android:layout_width="match_parent"
             android:layout_height="wrap_content"
             android:layout_weight="1"
-            android:text=""
+            android:text="@string/btn_back"
             android:minHeight="?android:attr/listPreferredItemHeight"
+            android:clickable="true"
+            style="@style/SelectableItem"
             android:gravity="center_vertical"
             android:layout_gravity="center_vertical" />
 

OpenKeychain/src/main/res/layout/affirmation_create_twitter_fragment_step1.xml

@@ -89,15 +89,17 @@
         android:id="@+id/create_key_buttons">
 
         <TextView
-            android:id="@+id/create_key_back_button"
+            android:id="@+id/back_button"
             android:paddingLeft="8dp"
             android:paddingRight="8dp"
             android:textAppearance="?android:attr/textAppearanceMedium"
             android:layout_width="match_parent"
             android:layout_height="wrap_content"
             android:layout_weight="1"
-            android:text=""
+            android:text="@string/btn_back"
             android:minHeight="?android:attr/listPreferredItemHeight"
+            android:clickable="true"
+            style="@style/SelectableItem"
             android:gravity="center_vertical"
             android:layout_gravity="center_vertical" />
 

OpenKeychain/src/main/res/layout/affirmation_create_twitter_fragment_step2.xml

@@ -103,16 +103,18 @@
         android:id="@+id/create_key_buttons">
 
         <TextView
-            android:id="@+id/create_key_back_button"
+            android:id="@+id/back_button"
             android:paddingLeft="8dp"
             android:paddingRight="8dp"
             android:textAppearance="?android:attr/textAppearanceMedium"
             android:layout_width="match_parent"
             android:layout_height="wrap_content"
             android:layout_weight="1"
-            android:text=""
+            android:text="@string/btn_back"
             android:minHeight="?android:attr/listPreferredItemHeight"
             android:gravity="center_vertical"
+            android:clickable="true"
+            style="@style/SelectableItem"
             android:layout_gravity="center_vertical" />
 
         <View

OpenKeychain/src/main/res/layout/affirmation_create_twitter_fragment_step3.xml

@@ -153,16 +153,18 @@
         android:id="@+id/create_key_buttons">
 
         <TextView
-            android:id="@+id/create_key_back_button"
+            android:id="@+id/back_button"
             android:paddingLeft="8dp"
             android:paddingRight="8dp"
             android:textAppearance="?android:attr/textAppearanceMedium"
             android:layout_width="match_parent"
             android:layout_height="wrap_content"
             android:layout_weight="1"
-            android:text=""
+            android:text="@string/btn_back"
             android:minHeight="?android:attr/listPreferredItemHeight"
             android:gravity="center_vertical"
+            android:clickable="true"
+            style="@style/SelectableItem"
             android:layout_gravity="center_vertical" />
 
         <View