add About section

app/build.gradle

@@ -32,6 +32,7 @@ dependencies {
     compile 'com.android.support:design:23.3.0'
     compile 'com.github.bumptech.glide:glide:3.7.0'
     compile 'com.davemorrissey.labs:subsampling-scale-image-view:3.4.1'
+    compile 'com.jakewharton:butterknife:7.0.1'
 }
 
 def Properties props = new Properties()

app/proguard-rules.pro

@@ -15,3 +15,16 @@
 #-keepclassmembers class fqcn.of.javascript.interface.for.webview {
 #   public *;
 #}
+
+# Butterknife
+-keep class butterknife.** { *; }
+-dontwarn butterknife.internal.**
+-keep class **$$ViewBinder { *; }
+
+-keepclasseswithmembernames class * {
+    @butterknife.* <fields>;
+}
+
+-keepclasseswithmembernames class * {
+    @butterknife.* <methods>;
+}

app/src/main/AndroidManifest.xml

@@ -26,5 +26,10 @@
         <activity
             android:name=".activities.ViewPagerActivity"
             android:theme="@style/FullScreenTheme"/>
+
+        <activity
+            android:name=".activities.AboutActivity"
+            android:label="@string/about"
+            android:screenOrientation="portrait"/>
     </application>
 </manifest>

app/src/main/java/com/simplemobiletools/gallery/activities/AboutActivity.java

@@ -0,0 +1,55 @@
+package com.simplemobiletools.gallery.activities;
+
+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 com.simplemobiletools.gallery.BuildConfig;
+import com.simplemobiletools.gallery.R;
+
+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/gallery/activities/MainActivity.java

@@ -58,6 +58,25 @@ public class MainActivity extends AppCompatActivity
         setContentView(R.layout.activity_main);
     }
 
+    @Override
+    public boolean onCreateOptionsMenu(Menu menu) {
+        MenuInflater inflater = getMenuInflater();
+        inflater.inflate(R.menu.menu, menu);
+        return true;
+    }
+
+    @Override
+    public boolean onOptionsItemSelected(MenuItem item) {
+        switch (item.getItemId()) {
+            case R.id.about:
+                final Intent intent = new Intent(getApplicationContext(), AboutActivity.class);
+                startActivity(intent);
+                return true;
+            default:
+                return super.onOptionsItemSelected(item);
+        }
+    }
+
     @Override
     protected void onResume() {
         super.onResume();

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

@@ -0,0 +1,8 @@
+<?xml version="1.0" encoding="utf-8"?>
+<menu xmlns:android="http://schemas.android.com/apk/res/android"
+      xmlns:app="http://schemas.android.com/apk/res-auto">
+    <item
+        android:id="@+id/about"
+        android:title="@string/about"
+        app:showAsAction="never"/>
+</menu>

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

@@ -28,4 +28,13 @@
         <item quantity="one">1 file deleted</item>
         <item quantity="other">%1$d files deleted</item>
     </plurals>
+
+    <!-- About -->
+    <string name="about">About</string>
+    <string name="website">For more simple apps please visit:\nhttp://simplemobiletools.com</string>
+    <string name="email_label">You can send your feedback and new app suggestions at:</string>
+    <string name="email">hello@simplemobiletools.com</string>
+    <string name="license">License</string>
+    <string name="version">v %1$s</string>
+    <string name="copyright">Copyright © Simple Mobile Tools %1$d</string>
 </resources>