Providing more detailed instructions for adding contacts

Users were confused by the process of adding a contact for the first time.
This change adds additional explanation and a picture of what is going on.

It also moves part of the UI into XML files.

Closes #87

briar-android/res/layout/invitation_bluetooth_start.xml

+<?xml version="1.0" encoding="utf-8"?>
+<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
+              android:orientation="vertical"
+              android:layout_width="match_parent"
+              android:layout_height="match_parent"
+              android:padding="7dp">
+
+    <TextView
+        android:layout_width="match_parent"
+        android:layout_height="wrap_content"
+        android:text="@string/your_nickname"
+        android:id="@+id/yourNicknameView"
+        android:padding="7dp"/>
+
+    <Spinner
+        android:layout_width="match_parent"
+        android:layout_height="wrap_content"
+        android:id="@+id/spinner"
+        android:spinnerMode="dropdown"
+        android:padding="7dp"/>
+
+    <TextView
+        android:layout_width="match_parent"
+        android:layout_height="wrap_content"
+        android:text="@string/face_to_face"
+        android:id="@+id/faceToFaceView"
+        android:padding="7dp"/>
+
+    <ImageView
+        android:layout_width="match_parent"
+        android:layout_height="wrap_content"
+        android:id="@+id/imageView"
+        android:src="@drawable/bluetooth"
+        android:scaleType="fitCenter"
+        android:baselineAlignBottom="false"
+        android:cropToPadding="false"
+        android:layout_weight="1"/>
+
+    <TextView
+        android:layout_width="match_parent"
+        android:layout_height="wrap_content"
+        android:text="@string/bluetooth_explanation"
+        android:id="@+id/explanationView"
+        android:padding="7dp"/>
+
+    <Button
+        android:layout_width="wrap_content"
+        android:layout_height="wrap_content"
+        android:text="@string/continue_button"
+        android:id="@+id/continueButton"
+        android:layout_gravity="center_horizontal"
+        android:layout_weight="0"/>
+</LinearLayout>
\ No newline at end of file

briar-android/res/values/strings.xml

@@ -36,8 +36,9 @@
     <string name="contact_list_title">Contacts</string>
     <string name="no_contacts">No contacts</string>
     <string name="add_contact_title">Add a Contact</string>
-    <string name="your_nickname">Your nickname: </string>
+    <string name="your_nickname">Please select the identity you want to use:</string>
     <string name="face_to_face">For security reasons you must be face-to-face with the person you want to add as a contact.\n\nThis will prevent anyone from impersonating you or reading your messages in future.</string>
+    <string name="bluetooth_explanation">Contacts need to add each other at the same time. Please continue together and allow Bluetooth to be enabled for the process to work.</string>
     <string name="continue_button">Continue</string>
     <string name="your_invitation_code">Your invitation code is</string>
     <string name="enter_invitation_code">Please enter your contact\'s invitation code:</string>

briar-android/src/org/briarproject/android/invitation/ChooseIdentityView.java

@@ -21,6 +21,7 @@ import org.briarproject.api.LocalAuthor;
 
 import android.content.Context;
 import android.content.Intent;
+import android.view.LayoutInflater;
 import android.view.View;
 import android.view.View.OnClickListener;
 import android.widget.AdapterView;
@@ -35,7 +36,6 @@ implements OnItemSelectedListener, OnClickListener {
 
 	private LocalAuthorSpinnerAdapter adapter = null;
 	private Spinner spinner = null;
-	private Button continueButton = null;
 
 	ChooseIdentityView(Context ctx) {
 		super(ctx);
@@ -45,34 +45,17 @@ implements OnItemSelectedListener, OnClickListener {
 		removeAllViews();
 		Context ctx = getContext();
 
-		LinearLayout innerLayout = new LinearLayout(ctx);
-		innerLayout.setLayoutParams(MATCH_WRAP);
-		innerLayout.setOrientation(HORIZONTAL);
-		innerLayout.setGravity(CENTER);
-
-		TextView yourNickname = new TextView(ctx);
-		yourNickname.setTextSize(18);
-		yourNickname.setPadding(pad, pad, pad, pad);
-		yourNickname.setText(R.string.your_nickname);
-		innerLayout.addView(yourNickname);
+		LayoutInflater inflater = (LayoutInflater) ctx.getSystemService
+				(Context.LAYOUT_INFLATER_SERVICE);
+		View view = inflater.inflate(R.layout.invitation_bluetooth_start, this);
 
 		adapter = new LocalAuthorSpinnerAdapter(ctx, false);
-		spinner = new Spinner(ctx);
+		spinner = (Spinner) view.findViewById(R.id.spinner);
 		spinner.setAdapter(adapter);
 		spinner.setOnItemSelectedListener(this);
-		innerLayout.addView(spinner);
-		addView(innerLayout);
-
-		TextView faceToFace = new TextView(ctx);
-		faceToFace.setPadding(pad, pad, pad, pad);
-		faceToFace.setText(R.string.face_to_face);
-		addView(faceToFace);
 
-		continueButton = new Button(ctx);
-		continueButton.setLayoutParams(WRAP_WRAP);
-		continueButton.setText(R.string.continue_button);
+		Button continueButton = (Button) view.findViewById(R.id.continueButton);
 		continueButton.setOnClickListener(this);
-		addView(continueButton);
 
 		container.loadLocalAuthors();
 	}