add About section

app/src/main/AndroidManifest.xml

@@ -12,7 +12,7 @@
         android:supportsRtl="true"
         android:theme="@style/AppTheme">
         <activity
-            android:name="com.simplemobiletools.draw.MainActivity"
+            android:name=".MainActivity"
             android:screenOrientation="portrait">
             <intent-filter>
                 <action android:name="android.intent.action.MAIN"/>
@@ -21,6 +21,11 @@
             </intent-filter>
         </activity>
 
+        <activity
+            android:name=".AboutActivity"
+            android:label="@string/about"
+            android:screenOrientation="portrait"/>
+
         <provider
             android:name="android.support.v4.content.FileProvider"
             android:authorities="com.simplemobiletools.draw.fileprovider"

app/src/main/java/com/simplemobiletools/draw/AboutActivity.java

@@ -0,0 +1,52 @@
+package com.simplemobiletools.draw;
+
+import android.content.res.Resources;
+import android.os.Bundle;
+import android.support.v7.app.AppCompatActivity;
+import android.text.Html;
+import android.text.method.LinkMovementMethod;
+import android.widget.TextView;
+
+import java.util.Calendar;
+
+import butterknife.Bind;
+import butterknife.ButterKnife;
+
+public class AboutActivity extends AppCompatActivity {
+    @Bind(R.id.about_copyright) TextView copyright;
+    @Bind(R.id.about_version) TextView version;
+    @Bind(R.id.about_email) TextView emailTV;
+    private Resources res;
+
+    @Override
+    protected void onCreate(Bundle savedInstanceState) {
+        super.onCreate(savedInstanceState);
+        setContentView(R.layout.activity_about);
+        ButterKnife.bind(this);
+        res = getResources();
+
+        setupEmail();
+        setupVersion();
+        setupCopyright();
+    }
+
+    private void setupEmail() {
+        final String email = res.getString(R.string.email);
+        final String appName = res.getString(R.string.app_name);
+        final String href = "<a href=\"mailto:" + email + "?subject=" + appName + "\">" + email + "</a>";
+        emailTV.setText(Html.fromHtml(href));
+        emailTV.setMovementMethod(LinkMovementMethod.getInstance());
+    }
+
+    private void setupVersion() {
+        final String versionName = BuildConfig.VERSION_NAME;
+        final String versionText = String.format(res.getString(R.string.version), versionName);
+        version.setText(versionText);
+    }
+
+    private void setupCopyright() {
+        final int year = Calendar.getInstance().get(Calendar.YEAR);
+        final String copyrightText = String.format(res.getString(R.string.copyright), year);
+        copyright.setText(copyrightText);
+    }
+}

app/src/main/java/com/simplemobiletools/draw/MainActivity.java

@@ -69,6 +69,10 @@ public class MainActivity extends AppCompatActivity {
             case R.id.menu_share:
                 shareImage();
                 return true;
+            case R.id.about:
+                final Intent intent = new Intent(getApplicationContext(), AboutActivity.class);
+                startActivity(intent);
+                return true;
             default:
                 return super.onOptionsItemSelected(item);
         }

app/src/main/res/layout/activity_about.xml

@@ -0,0 +1,55 @@
+<?xml version="1.0" encoding="utf-8"?>
+<RelativeLayout
+    android:id="@+id/about_holder"
+    xmlns:android="http://schemas.android.com/apk/res/android"
+    android:layout_width="match_parent"
+    android:layout_height="match_parent"
+    android:layout_margin="@dimen/activity_margin">
+
+    <TextView
+        android:id="@+id/about_website"
+        android:layout_width="match_parent"
+        android:layout_height="wrap_content"
+        android:autoLink="web"
+        android:text="@string/website"/>
+
+    <TextView
+        android:id="@+id/about_email_label"
+        android:layout_width="match_parent"
+        android:layout_height="wrap_content"
+        android:layout_below="@+id/about_website"
+        android:layout_marginTop="@dimen/activity_margin"
+        android:text="@string/email_label"/>
+
+    <TextView
+        android:id="@+id/about_email"
+        android:layout_width="match_parent"
+        android:layout_height="wrap_content"
+        android:layout_below="@+id/about_email_label"
+        android:text="@string/email"/>
+
+    <TextView
+        android:id="@+id/about_license"
+        android:layout_width="match_parent"
+        android:layout_height="wrap_content"
+        android:layout_below="@+id/about_email"
+        android:layout_marginTop="@dimen/activity_margin"
+        android:text="@string/license"/>
+
+    <TextView
+        android:id="@+id/about_version"
+        android:layout_width="match_parent"
+        android:layout_height="wrap_content"
+        android:layout_above="@+id/about_copyright"
+        android:gravity="center_horizontal"
+        android:text="v 1.0"/>
+
+    <TextView
+        android:id="@+id/about_copyright"
+        android:layout_width="match_parent"
+        android:layout_height="wrap_content"
+        android:layout_alignParentBottom="true"
+        android:gravity="center_horizontal"
+        android:text="Copyright © Simple Mobile Tools 2000"/>
+
+</RelativeLayout>

app/src/main/res/menu/menu.xml

@@ -11,5 +11,8 @@
         android:icon="@android:drawable/ic_menu_share"
         android:title="Share"
         app:showAsAction="always"/>
-
+    <item
+        android:id="@+id/about"
+        android:title="@string/about"
+        app:showAsAction="never"/>
 </menu>

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

@@ -7,4 +7,13 @@
     <string name="save_file">Save file</string>
     <string name="enter_file_name">Please enter a file name</string>
     <string name="no_permissions">Could not save the file without accessing the external storage</string>
+
+    <!-- About -->
+    <string name="about">About</string>
+    <string name="website">For more simple apps please visit:\nhttp://simplemobiletools.com</string>
+    <string name="email_label">You can send your feedback and new app suggestions at:</string>
+    <string name="email">hello@simplemobiletools.com</string>
+    <string name="license">License</string>
+    <string name="version">v %1$s</string>
+    <string name="copyright">Copyright © Simple Mobile Tools %1$d</string>
 </resources>