Style tabs, add missing drawables

22 files changed, 43 insertions, 573 deletions

diff --git a/OpenKeychain/build.gradle b/OpenKeychain/build.gradle
index 21482340a..9d8469144 100644
--- a/OpenKeychain/build.gradle
+++ b/OpenKeychain/build.gradle
@@ -25,6 +25,7 @@ dependencies {
     compile 'com.journeyapps:zxing-android-embedded:2.0.1@aar'
     compile 'com.journeyapps:zxing-android-integration:2.0.1@aar'
     compile 'com.google.zxing:core:3.0.1'
+    compile 'com.jpardogo.materialtabstrip:library:1.0.8'
 }
 
 android {
diff --git a/OpenKeychain/src/main/java/org/sufficientlysecure/keychain/ui/BaseActivity.java b/OpenKeychain/src/main/java/org/sufficientlysecure/keychain/ui/BaseActivity.java
index ee73bb8f2..c38d126d7 100644
--- a/OpenKeychain/src/main/java/org/sufficientlysecure/keychain/ui/BaseActivity.java
+++ b/OpenKeychain/src/main/java/org/sufficientlysecure/keychain/ui/BaseActivity.java
@@ -27,7 +27,7 @@ import org.sufficientlysecure.keychain.R;
  * Sets action bar
  */
 public abstract class BaseActivity extends ActionBarActivity {
-    private Toolbar toolbar;
+    protected Toolbar mToolbar;
 
     @Override
     protected void onCreate(Bundle savedInstanceState) {
@@ -39,14 +39,14 @@ public abstract class BaseActivity extends ActionBarActivity {
     protected abstract void initLayout();
 
     protected void initToolbar() {
-        toolbar = (Toolbar) findViewById(R.id.toolbar);
-        if (toolbar != null) {
-            setSupportActionBar(toolbar);
+        mToolbar = (Toolbar) findViewById(R.id.toolbar);
+        if (mToolbar != null) {
+            setSupportActionBar(mToolbar);
             getSupportActionBar().setDisplayHomeAsUpEnabled(true);
         }
     }
 
     protected void setActionBarIcon(int iconRes) {
-        toolbar.setNavigationIcon(iconRes);
+        mToolbar.setNavigationIcon(iconRes);
     }
 }
diff --git a/OpenKeychain/src/main/java/org/sufficientlysecure/keychain/ui/HelpActivity.java b/OpenKeychain/src/main/java/org/sufficientlysecure/keychain/ui/HelpActivity.java
index 8d4d3c915..2eb35351e 100644
--- a/OpenKeychain/src/main/java/org/sufficientlysecure/keychain/ui/HelpActivity.java
+++ b/OpenKeychain/src/main/java/org/sufficientlysecure/keychain/ui/HelpActivity.java
@@ -20,12 +20,12 @@ package org.sufficientlysecure.keychain.ui;
 import android.content.Intent;
 import android.os.Bundle;
 import android.support.v4.view.ViewPager;
-import android.support.v7.app.ActionBar;
-import android.support.v7.app.ActionBarActivity;
+import android.view.View;
+
+import com.astuetz.PagerSlidingTabStrip;
 
 import org.sufficientlysecure.keychain.R;
 import org.sufficientlysecure.keychain.ui.adapter.PagerTabStripAdapter;
-import org.sufficientlysecure.keychain.ui.widget.SlidingTabLayout;
 
 public class HelpActivity extends BaseActivity {
     public static final String EXTRA_SELECTED_TAB = "selected_tab";
@@ -44,14 +44,16 @@ public class HelpActivity extends BaseActivity {
     public void onCreate(Bundle savedInstanceState) {
         super.onCreate(savedInstanceState);
 
-        final ActionBar actionBar = getSupportActionBar();
-        actionBar.setDisplayShowTitleEnabled(true);
-        actionBar.setDisplayHomeAsUpEnabled(false);
-        actionBar.setHomeButtonEnabled(false);
+        mToolbar.setNavigationOnClickListener(new View.OnClickListener() {
+            @Override
+            public void onClick(View v) {
+                finish();
+            }
+        });
 
         mViewPager = (ViewPager) findViewById(R.id.pager);
-        SlidingTabLayout slidingTabLayout =
-                (SlidingTabLayout) findViewById(R.id.sliding_tab_layout);
+        PagerSlidingTabStrip slidingTabLayout =
+                (PagerSlidingTabStrip) findViewById(R.id.sliding_tab_layout);
 
         mTabsAdapter = new PagerTabStripAdapter(this);
         mViewPager.setAdapter(mTabsAdapter);
diff --git a/OpenKeychain/src/main/java/org/sufficientlysecure/keychain/ui/ViewKeyActivity.java b/OpenKeychain/src/main/java/org/sufficientlysecure/keychain/ui/ViewKeyActivity.java
index ae80679d0..3bb0695a0 100644
--- a/OpenKeychain/src/main/java/org/sufficientlysecure/keychain/ui/ViewKeyActivity.java
+++ b/OpenKeychain/src/main/java/org/sufficientlysecure/keychain/ui/ViewKeyActivity.java
@@ -21,7 +21,6 @@ package org.sufficientlysecure.keychain.ui;
 import android.annotation.TargetApi;
 import android.content.Intent;
 import android.database.Cursor;
-import android.graphics.PorterDuff;
 import android.net.Uri;
 import android.nfc.NdefMessage;
 import android.nfc.NdefRecord;
@@ -38,7 +37,6 @@ import android.support.v4.content.CursorLoader;
 import android.support.v4.content.Loader;
 import android.support.v4.view.ViewPager;
 import android.support.v7.app.ActionBar;
-import android.support.v7.app.ActionBarActivity;
 import android.view.Menu;
 import android.view.MenuItem;
 import android.view.View;
@@ -47,22 +45,21 @@ import android.widget.LinearLayout;
 import android.widget.TextView;
 import android.widget.Toast;
 
+import com.astuetz.PagerSlidingTabStrip;
+
 import org.sufficientlysecure.keychain.Constants;
 import org.sufficientlysecure.keychain.R;
-import org.sufficientlysecure.keychain.ui.util.KeyFormattingUtils;
-import org.sufficientlysecure.keychain.util.ContactHelper;
-import org.sufficientlysecure.keychain.util.ExportHelper;
-import org.sufficientlysecure.keychain.util.Preferences;
+import org.sufficientlysecure.keychain.operations.results.OperationResult;
 import org.sufficientlysecure.keychain.pgp.KeyRing;
 import org.sufficientlysecure.keychain.provider.KeychainContract;
 import org.sufficientlysecure.keychain.provider.ProviderHelper;
 import org.sufficientlysecure.keychain.service.KeychainIntentServiceHandler;
-import org.sufficientlysecure.keychain.operations.results.OperationResult;
 import org.sufficientlysecure.keychain.ui.adapter.PagerTabStripAdapter;
-import org.sufficientlysecure.keychain.ui.widget.SlidingTabLayout;
-import org.sufficientlysecure.keychain.ui.widget.SlidingTabLayout.TabColorizer;
-import org.sufficientlysecure.keychain.util.Log;
+import org.sufficientlysecure.keychain.ui.util.KeyFormattingUtils;
 import org.sufficientlysecure.keychain.ui.util.Notify;
+import org.sufficientlysecure.keychain.util.ContactHelper;
+import org.sufficientlysecure.keychain.util.ExportHelper;
+import org.sufficientlysecure.keychain.util.Log;
 
 import java.util.Date;
 import java.util.HashMap;
@@ -81,7 +78,7 @@ public class ViewKeyActivity extends BaseActivity implements
 
     // view
     private ViewPager mViewPager;
-    private SlidingTabLayout mSlidingTabLayout;
+    private PagerSlidingTabStrip mSlidingTabLayout;
     private PagerTabStripAdapter mTabsAdapter;
 
     private LinearLayout mStatusLayout;
@@ -117,19 +114,7 @@ public class ViewKeyActivity extends BaseActivity implements
         mStatusDivider = findViewById(R.id.view_key_status_divider);
 
         mViewPager = (ViewPager) findViewById(R.id.view_key_pager);
-        mSlidingTabLayout = (SlidingTabLayout) findViewById(R.id.view_key_sliding_tab_layout);
-
-        mSlidingTabLayout.setCustomTabColorizer(new TabColorizer() {
-            @Override
-            public int getIndicatorColor(int position) {
-                return 0xFF4caf50;
-            }
-
-            @Override
-            public int getDividerColor(int position) {
-                return 0;
-            }
-        });
+        mSlidingTabLayout = (PagerSlidingTabStrip) findViewById(R.id.view_key_sliding_tab_layout);
 
         int switchToTab = TAB_MAIN;
         Intent intent = getIntent();
diff --git a/OpenKeychain/src/main/java/org/sufficientlysecure/keychain/ui/widget/SlidingTabLayout.java b/OpenKeychain/src/main/java/org/sufficientlysecure/keychain/ui/widget/SlidingTabLayout.java
deleted file mode 100644
index 17471c86c..000000000
--- a/OpenKeychain/src/main/java/org/sufficientlysecure/keychain/ui/widget/SlidingTabLayout.java
+++ /dev/null
@@ -1,318 +0,0 @@
-/*
- * Copyright (C) 2013 The Android Open Source Project
- *
- * Licensed under the Apache License, Version 2.0 (the "License");
- * you may not use this file except in compliance with the License.
- * You may obtain a copy of the License at
- *
- *      http://www.apache.org/licenses/LICENSE-2.0
- *
- * Unless required by applicable law or agreed to in writing, software
- * distributed under the License is distributed on an "AS IS" BASIS,
- * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
- * See the License for the specific language governing permissions and
- * limitations under the License.
- */
-
-package org.sufficientlysecure.keychain.ui.widget;
-
-import android.content.Context;
-import android.graphics.Typeface;
-import android.os.Build;
-import android.support.v4.view.PagerAdapter;
-import android.support.v4.view.ViewPager;
-import android.util.AttributeSet;
-import android.util.TypedValue;
-import android.view.Gravity;
-import android.view.LayoutInflater;
-import android.view.View;
-import android.widget.HorizontalScrollView;
-import android.widget.TextView;
-
-/**
- * Copied from http://developer.android.com/samples/SlidingTabsColors/index.html
- */
-
-/**
- * To be used with ViewPager to provide a tab indicator component which give constant feedback as to
- * the user's scroll progress.
- * <p/>
- * To use the component, simply add it to your view hierarchy. Then in your
- * {@link android.app.Activity} or {@link android.support.v4.app.Fragment} call
- * {@link #setViewPager(ViewPager)} providing it the ViewPager this layout is being used for.
- * <p/>
- * The colors can be customized in two ways. The first and simplest is to provide an array of colors
- * via {@link #setSelectedIndicatorColors(int...)} and {@link #setDividerColors(int...)}. The
- * alternative is via the {@link TabColorizer} interface which provides you complete control over
- * which color is used for any individual position.
- * <p/>
- * The views used as tabs can be customized by calling {@link #setCustomTabView(int, int)},
- * providing the layout ID of your custom layout.
- */
-public class SlidingTabLayout extends HorizontalScrollView {
-
-    /**
-     * Allows complete control over the colors drawn in the tab layout. Set with
-     * {@link #setCustomTabColorizer(TabColorizer)}.
-     */
-    public interface TabColorizer {
-
-        /**
-         * @return return the color of the indicator used when {@code position} is selected.
-         */
-        int getIndicatorColor(int position);
-
-        /**
-         * @return return the color of the divider drawn to the right of {@code position}.
-         */
-        int getDividerColor(int position);
-
-    }
-
-    private static final int TITLE_OFFSET_DIPS = 24;
-    private static final int TAB_VIEW_PADDING_DIPS = 16;
-    private static final int TAB_VIEW_TEXT_SIZE_SP = 12;
-
-    private int mTitleOffset;
-
-    private int mTabViewLayoutId;
-    private int mTabViewTextViewId;
-
-    private ViewPager mViewPager;
-    private ViewPager.OnPageChangeListener mViewPagerPageChangeListener;
-
-    private final SlidingTabStrip mTabStrip;
-
-    public SlidingTabLayout(Context context) {
-        this(context, null);
-    }
-
-    public SlidingTabLayout(Context context, AttributeSet attrs) {
-        this(context, attrs, 0);
-    }
-
-    public SlidingTabLayout(Context context, AttributeSet attrs, int defStyle) {
-        super(context, attrs, defStyle);
-
-        // Disable the Scroll Bar
-        setHorizontalScrollBarEnabled(false);
-        // Make sure that the Tab Strips fills this View
-        setFillViewport(true);
-
-        mTitleOffset = (int) (TITLE_OFFSET_DIPS * getResources().getDisplayMetrics().density);
-
-        mTabStrip = new SlidingTabStrip(context);
-        addView(mTabStrip, LayoutParams.MATCH_PARENT, LayoutParams.WRAP_CONTENT);
-    }
-
-    /**
-     * Set the custom {@link TabColorizer} to be used.
-     * <p/>
-     * If you only require simple custmisation then you can use
-     * {@link #setSelectedIndicatorColors(int...)} and {@link #setDividerColors(int...)} to achieve
-     * similar effects.
-     */
-    public void setCustomTabColorizer(TabColorizer tabColorizer) {
-        mTabStrip.setCustomTabColorizer(tabColorizer);
-    }
-
-    /**
-     * Sets the colors to be used for indicating the selected tab. These colors are treated as a
-     * circular array. Providing one color will mean that all tabs are indicated with the same color.
-     */
-    public void setSelectedIndicatorColors(int... colors) {
-        mTabStrip.setSelectedIndicatorColors(colors);
-    }
-
-    /**
-     * Sets the colors to be used for tab dividers. These colors are treated as a circular array.
-     * Providing one color will mean that all tabs are indicated with the same color.
-     */
-    public void setDividerColors(int... colors) {
-        mTabStrip.setDividerColors(colors);
-    }
-
-    /**
-     * Set the {@link ViewPager.OnPageChangeListener}. When using {@link SlidingTabLayout} you are
-     * required to set any {@link ViewPager.OnPageChangeListener} through this method. This is so
-     * that the layout can update it's scroll position correctly.
-     *
-     * @see ViewPager#setOnPageChangeListener(ViewPager.OnPageChangeListener)
-     */
-    public void setOnPageChangeListener(ViewPager.OnPageChangeListener listener) {
-        mViewPagerPageChangeListener = listener;
-    }
-
-    /**
-     * Set the custom layout to be inflated for the tab views.
-     *
-     * @param layoutResId Layout id to be inflated
-     * @param textViewId  id of the {@link TextView} in the inflated view
-     */
-    public void setCustomTabView(int layoutResId, int textViewId) {
-        mTabViewLayoutId = layoutResId;
-        mTabViewTextViewId = textViewId;
-    }
-
-    /**
-     * Sets the associated view pager. Note that the assumption here is that the pager content
-     * (number of tabs and tab titles) does not change after this call has been made.
-     */
-    public void setViewPager(ViewPager viewPager) {
-        mTabStrip.removeAllViews();
-
-        mViewPager = viewPager;
-        if (viewPager != null) {
-            viewPager.setOnPageChangeListener(new InternalViewPagerListener());
-            populateTabStrip();
-        }
-    }
-
-    /**
-     * Create a default view to be used for tabs. This is called if a custom tab view is not set via
-     * {@link #setCustomTabView(int, int)}.
-     */
-    protected TextView createDefaultTabView(Context context) {
-        TextView textView = new TextView(context);
-        textView.setGravity(Gravity.CENTER);
-        textView.setTextSize(TypedValue.COMPLEX_UNIT_SP, TAB_VIEW_TEXT_SIZE_SP);
-        textView.setTypeface(Typeface.DEFAULT_BOLD);
-
-        if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.HONEYCOMB) {
-            // If we're running on Honeycomb or newer, then we can use the Theme's
-            // selectableItemBackground to ensure that the View has a pressed state
-            TypedValue outValue = new TypedValue();
-            getContext().getTheme().resolveAttribute(android.R.attr.selectableItemBackground,
-                    outValue, true);
-            textView.setBackgroundResource(outValue.resourceId);
-        }
-
-        if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.ICE_CREAM_SANDWICH) {
-            // If we're running on ICS or newer, enable all-caps to match the Action Bar tab style
-            textView.setAllCaps(true);
-        }
-
-        int padding = (int) (TAB_VIEW_PADDING_DIPS * getResources().getDisplayMetrics().density);
-        textView.setPadding(padding, padding, padding, padding);
-
-        return textView;
-    }
-
-    private void populateTabStrip() {
-        final PagerAdapter adapter = mViewPager.getAdapter();
-        final View.OnClickListener tabClickListener = new TabClickListener();
-
-        for (int i = 0; i < adapter.getCount(); i++) {
-            View tabView = null;
-            TextView tabTitleView = null;
-
-            if (mTabViewLayoutId != 0) {
-                // If there is a custom tab view layout id set, try and inflate it
-                tabView = LayoutInflater.from(getContext()).inflate(mTabViewLayoutId, mTabStrip,
-                        false);
-                tabTitleView = (TextView) tabView.findViewById(mTabViewTextViewId);
-            }
-
-            if (tabView == null) {
-                tabView = createDefaultTabView(getContext());
-            }
-
-            if (tabTitleView == null && TextView.class.isInstance(tabView)) {
-                tabTitleView = (TextView) tabView;
-            }
-
-            tabTitleView.setText(adapter.getPageTitle(i));
-            tabView.setOnClickListener(tabClickListener);
-
-            mTabStrip.addView(tabView);
-        }
-    }
-
-    @Override
-    protected void onAttachedToWindow() {
-        super.onAttachedToWindow();
-
-        if (mViewPager != null) {
-            scrollToTab(mViewPager.getCurrentItem(), 0);
-        }
-    }
-
-    private void scrollToTab(int tabIndex, int positionOffset) {
-        final int tabStripChildCount = mTabStrip.getChildCount();
-        if (tabStripChildCount == 0 || tabIndex < 0 || tabIndex >= tabStripChildCount) {
-            return;
-        }
-
-        View selectedChild = mTabStrip.getChildAt(tabIndex);
-        if (selectedChild != null) {
-            int targetScrollX = selectedChild.getLeft() + positionOffset;
-
-            if (tabIndex > 0 || positionOffset > 0) {
-                // If we're not at the first child and are mid-scroll, make sure we obey the offset
-                targetScrollX -= mTitleOffset;
-            }
-
-            scrollTo(targetScrollX, 0);
-        }
-    }
-
-    private class InternalViewPagerListener implements ViewPager.OnPageChangeListener {
-        private int mScrollState;
-
-        @Override
-        public void onPageScrolled(int position, float positionOffset, int positionOffsetPixels) {
-            int tabStripChildCount = mTabStrip.getChildCount();
-            if ((tabStripChildCount == 0) || (position < 0) || (position >= tabStripChildCount)) {
-                return;
-            }
-
-            mTabStrip.onViewPagerPageChanged(position, positionOffset);
-
-            View selectedTitle = mTabStrip.getChildAt(position);
-            int extraOffset = (selectedTitle != null)
-                    ? (int) (positionOffset * selectedTitle.getWidth())
-                    : 0;
-            scrollToTab(position, extraOffset);
-
-            if (mViewPagerPageChangeListener != null) {
-                mViewPagerPageChangeListener.onPageScrolled(position, positionOffset,
-                        positionOffsetPixels);
-            }
-        }
-
-        @Override
-        public void onPageScrollStateChanged(int state) {
-            mScrollState = state;
-
-            if (mViewPagerPageChangeListener != null) {
-                mViewPagerPageChangeListener.onPageScrollStateChanged(state);
-            }
-        }
-
-        @Override
-        public void onPageSelected(int position) {
-            if (mScrollState == ViewPager.SCROLL_STATE_IDLE) {
-                mTabStrip.onViewPagerPageChanged(position, 0f);
-                scrollToTab(position, 0);
-            }
-
-            if (mViewPagerPageChangeListener != null) {
-                mViewPagerPageChangeListener.onPageSelected(position);
-            }
-        }
-
-    }
-
-    private class TabClickListener implements View.OnClickListener {
-        @Override
-        public void onClick(View v) {
-            for (int i = 0; i < mTabStrip.getChildCount(); i++) {
-                if (v == mTabStrip.getChildAt(i)) {
-                    mViewPager.setCurrentItem(i);
-                    return;
-                }
-            }
-        }
-    }
-
-}
diff --git a/OpenKeychain/src/main/java/org/sufficientlysecure/keychain/ui/widget/SlidingTabStrip.java b/OpenKeychain/src/main/java/org/sufficientlysecure/keychain/ui/widget/SlidingTabStrip.java
deleted file mode 100644
index 4c41e12c5..000000000
--- a/OpenKeychain/src/main/java/org/sufficientlysecure/keychain/ui/widget/SlidingTabStrip.java
+++ /dev/null
@@ -1,211 +0,0 @@
-/*
- * Copyright (C) 2013 The Android Open Source Project
- *
- * Licensed under the Apache License, Version 2.0 (the "License");
- * you may not use this file except in compliance with the License.
- * You may obtain a copy of the License at
- *
- *      http://www.apache.org/licenses/LICENSE-2.0
- *
- * Unless required by applicable law or agreed to in writing, software
- * distributed under the License is distributed on an "AS IS" BASIS,
- * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
- * See the License for the specific language governing permissions and
- * limitations under the License.
- */
-
-package org.sufficientlysecure.keychain.ui.widget;
-
-import android.R;
-import android.content.Context;
-import android.graphics.Canvas;
-import android.graphics.Color;
-import android.graphics.Paint;
-import android.util.AttributeSet;
-import android.util.TypedValue;
-import android.view.View;
-import android.widget.LinearLayout;
-
-/**
- * Copied from http://developer.android.com/samples/SlidingTabsColors/index.html
- */
-class SlidingTabStrip extends LinearLayout {
-
-    private static final int DEFAULT_BOTTOM_BORDER_THICKNESS_DIPS = 2;
-    private static final byte DEFAULT_BOTTOM_BORDER_COLOR_ALPHA = 0x26;
-    private static final int SELECTED_INDICATOR_THICKNESS_DIPS = 8;
-    private static final int DEFAULT_SELECTED_INDICATOR_COLOR = 0xFFAA66CC;
-
-    private static final int DEFAULT_DIVIDER_THICKNESS_DIPS = 1;
-    private static final byte DEFAULT_DIVIDER_COLOR_ALPHA = 0x20;
-    private static final float DEFAULT_DIVIDER_HEIGHT = 0.5f;
-
-    private final int mBottomBorderThickness;
-    private final Paint mBottomBorderPaint;
-
-    private final int mSelectedIndicatorThickness;
-    private final Paint mSelectedIndicatorPaint;
-
-    private final int mDefaultBottomBorderColor;
-
-    private final Paint mDividerPaint;
-    private final float mDividerHeight;
-
-    private int mSelectedPosition;
-    private float mSelectionOffset;
-
-    private SlidingTabLayout.TabColorizer mCustomTabColorizer;
-    private final SimpleTabColorizer mDefaultTabColorizer;
-
-    SlidingTabStrip(Context context) {
-        this(context, null);
-    }
-
-    SlidingTabStrip(Context context, AttributeSet attrs) {
-        super(context, attrs);
-        setWillNotDraw(false);
-
-        final float density = getResources().getDisplayMetrics().density;
-
-        TypedValue outValue = new TypedValue();
-        context.getTheme().resolveAttribute(R.attr.colorForeground, outValue, true);
-        final int themeForegroundColor = outValue.data;
-
-        mDefaultBottomBorderColor = setColorAlpha(themeForegroundColor,
-                DEFAULT_BOTTOM_BORDER_COLOR_ALPHA);
-
-        mDefaultTabColorizer = new SimpleTabColorizer();
-        mDefaultTabColorizer.setIndicatorColors(DEFAULT_SELECTED_INDICATOR_COLOR);
-        mDefaultTabColorizer.setDividerColors(setColorAlpha(themeForegroundColor,
-                DEFAULT_DIVIDER_COLOR_ALPHA));
-
-        mBottomBorderThickness = (int) (DEFAULT_BOTTOM_BORDER_THICKNESS_DIPS * density);
-        mBottomBorderPaint = new Paint();
-        mBottomBorderPaint.setColor(mDefaultBottomBorderColor);
-
-        mSelectedIndicatorThickness = (int) (SELECTED_INDICATOR_THICKNESS_DIPS * density);
-        mSelectedIndicatorPaint = new Paint();
-
-        mDividerHeight = DEFAULT_DIVIDER_HEIGHT;
-        mDividerPaint = new Paint();
-        mDividerPaint.setStrokeWidth((int) (DEFAULT_DIVIDER_THICKNESS_DIPS * density));
-    }
-
-    void setCustomTabColorizer(SlidingTabLayout.TabColorizer customTabColorizer) {
-        mCustomTabColorizer = customTabColorizer;
-        invalidate();
-    }
-
-    void setSelectedIndicatorColors(int... colors) {
-        // Make sure that the custom colorizer is removed
-        mCustomTabColorizer = null;
-        mDefaultTabColorizer.setIndicatorColors(colors);
-        invalidate();
-    }
-
-    void setDividerColors(int... colors) {
-        // Make sure that the custom colorizer is removed
-        mCustomTabColorizer = null;
-        mDefaultTabColorizer.setDividerColors(colors);
-        invalidate();
-    }
-
-    void onViewPagerPageChanged(int position, float positionOffset) {
-        mSelectedPosition = position;
-        mSelectionOffset = positionOffset;
-        invalidate();
-    }
-
-    @Override
-    protected void onDraw(Canvas canvas) {
-        final int height = getHeight();
-        final int childCount = getChildCount();
-        final int dividerHeightPx = (int) (Math.min(Math.max(0f, mDividerHeight), 1f) * height);
-        final SlidingTabLayout.TabColorizer tabColorizer = mCustomTabColorizer != null
-                ? mCustomTabColorizer
-                : mDefaultTabColorizer;
-
-        // Thick colored underline below the current selection
-        if (childCount > 0) {
-            View selectedTitle = getChildAt(mSelectedPosition);
-            int left = selectedTitle.getLeft();
-            int right = selectedTitle.getRight();
-            int color = tabColorizer.getIndicatorColor(mSelectedPosition);
-
-            if (mSelectionOffset > 0f && mSelectedPosition < (getChildCount() - 1)) {
-                int nextColor = tabColorizer.getIndicatorColor(mSelectedPosition + 1);
-                if (color != nextColor) {
-                    color = blendColors(nextColor, color, mSelectionOffset);
-                }
-
-                // Draw the selection partway between the tabs
-                View nextTitle = getChildAt(mSelectedPosition + 1);
-                left = (int) (mSelectionOffset * nextTitle.getLeft() +
-                        (1.0f - mSelectionOffset) * left);
-                right = (int) (mSelectionOffset * nextTitle.getRight() +
-                        (1.0f - mSelectionOffset) * right);
-            }
-
-            mSelectedIndicatorPaint.setColor(color);
-
-            canvas.drawRect(left, height - mSelectedIndicatorThickness, right,
-                    height, mSelectedIndicatorPaint);
-        }
-
-        // Thin underline along the entire bottom edge
-        canvas.drawRect(0, height - mBottomBorderThickness, getWidth(), height, mBottomBorderPaint);
-
-        // Vertical separators between the titles
-        int separatorTop = (height - dividerHeightPx) / 2;
-        for (int i = 0; i < childCount - 1; i++) {
-            View child = getChildAt(i);
-            mDividerPaint.setColor(tabColorizer.getDividerColor(i));
-            canvas.drawLine(child.getRight(), separatorTop, child.getRight(),
-                    separatorTop + dividerHeightPx, mDividerPaint);
-        }
-    }
-
-    /**
-     * Set the alpha value of the {@code color} to be the given {@code alpha} value.
-     */
-    private static int setColorAlpha(int color, byte alpha) {
-        return Color.argb(alpha, Color.red(color), Color.green(color), Color.blue(color));
-    }
-
-    /**
-     * Blend {@code color1} and {@code color2} using the given ratio.
-     *
-     * @param ratio of which to blend. 1.0 will return {@code color1}, 0.5 will give an even blend,
-     *              0.0 will return {@code color2}.
-     */
-    private static int blendColors(int color1, int color2, float ratio) {
-        final float inverseRation = 1f - ratio;
-        float r = (Color.red(color1) * ratio) + (Color.red(color2) * inverseRation);
-        float g = (Color.green(color1) * ratio) + (Color.green(color2) * inverseRation);
-        float b = (Color.blue(color1) * ratio) + (Color.blue(color2) * inverseRation);
-        return Color.rgb((int) r, (int) g, (int) b);
-    }
-
-    private static class SimpleTabColorizer implements SlidingTabLayout.TabColorizer {
-        private int[] mIndicatorColors;
-        private int[] mDividerColors;
-
-        @Override
-        public final int getIndicatorColor(int position) {
-            return mIndicatorColors[position % mIndicatorColors.length];
-        }
-
-        @Override
-        public final int getDividerColor(int position) {
-            return mDividerColors[position % mDividerColors.length];
-        }
-
-        void setIndicatorColors(int... colors) {
-            mIndicatorColors = colors;
-        }
-
-        void setDividerColors(int... colors) {
-            mDividerColors = colors;
-        }
-    }
-}
\ No newline at end of file
diff --git a/OpenKeychain/src/main/res/drawable-hdpi/key_flag_authenticate.png b/OpenKeychain/src/main/res/drawable-hdpi/key_flag_authenticate.png
new file mode 100644
index 000000000..9d4ed6e84
--- /dev/null
+++ b/OpenKeychain/src/main/res/drawable-hdpi/key_flag_authenticate.png
diff --git a/OpenKeychain/src/main/res/drawable-hdpi/key_flag_certify.png b/OpenKeychain/src/main/res/drawable-hdpi/key_flag_certify.png
new file mode 100644
index 000000000..e76393659
--- /dev/null
+++ b/OpenKeychain/src/main/res/drawable-hdpi/key_flag_certify.png
diff --git a/OpenKeychain/src/main/res/drawable-hdpi/key_flag_encrypt.png b/OpenKeychain/src/main/res/drawable-hdpi/key_flag_encrypt.png
new file mode 100644
index 000000000..3c2f8c09c
--- /dev/null
+++ b/OpenKeychain/src/main/res/drawable-hdpi/key_flag_encrypt.png
diff --git a/OpenKeychain/src/main/res/drawable-hdpi/key_flag_sign.png b/OpenKeychain/src/main/res/drawable-hdpi/key_flag_sign.png
new file mode 100644
index 000000000..046424643
--- /dev/null
+++ b/OpenKeychain/src/main/res/drawable-hdpi/key_flag_sign.png
diff --git a/OpenKeychain/src/main/res/drawable-xhdpi/key_flag_authenticate.png b/OpenKeychain/src/main/res/drawable-xhdpi/key_flag_authenticate.png
new file mode 100644
index 000000000..8d36d7202
--- /dev/null
+++ b/OpenKeychain/src/main/res/drawable-xhdpi/key_flag_authenticate.png
diff --git a/OpenKeychain/src/main/res/drawable-xhdpi/key_flag_certify.png b/OpenKeychain/src/main/res/drawable-xhdpi/key_flag_certify.png
new file mode 100644
index 000000000..01a74bcc0
--- /dev/null
+++ b/OpenKeychain/src/main/res/drawable-xhdpi/key_flag_certify.png
diff --git a/OpenKeychain/src/main/res/drawable-xhdpi/key_flag_encrypt.png b/OpenKeychain/src/main/res/drawable-xhdpi/key_flag_encrypt.png
new file mode 100644
index 000000000..ff07bd0a4
--- /dev/null
+++ b/OpenKeychain/src/main/res/drawable-xhdpi/key_flag_encrypt.png
diff --git a/OpenKeychain/src/main/res/drawable-xhdpi/key_flag_sign.png b/OpenKeychain/src/main/res/drawable-xhdpi/key_flag_sign.png
new file mode 100644
index 000000000..b8002162a
--- /dev/null
+++ b/OpenKeychain/src/main/res/drawable-xhdpi/key_flag_sign.png
diff --git a/OpenKeychain/src/main/res/drawable-xxhdpi/key_flag_authenticate.png b/OpenKeychain/src/main/res/drawable-xxhdpi/key_flag_authenticate.png
new file mode 100644
index 000000000..d786dc72f
--- /dev/null
+++ b/OpenKeychain/src/main/res/drawable-xxhdpi/key_flag_authenticate.png
diff --git a/OpenKeychain/src/main/res/drawable-xxhdpi/key_flag_certify.png b/OpenKeychain/src/main/res/drawable-xxhdpi/key_flag_certify.png
new file mode 100644
index 000000000..4bb97f992
--- /dev/null
+++ b/OpenKeychain/src/main/res/drawable-xxhdpi/key_flag_certify.png
diff --git a/OpenKeychain/src/main/res/drawable-xxhdpi/key_flag_encrypt.png b/OpenKeychain/src/main/res/drawable-xxhdpi/key_flag_encrypt.png
new file mode 100644
index 000000000..fe0c8e41b
--- /dev/null
+++ b/OpenKeychain/src/main/res/drawable-xxhdpi/key_flag_encrypt.png
diff --git a/OpenKeychain/src/main/res/drawable-xxhdpi/key_flag_sign.png b/OpenKeychain/src/main/res/drawable-xxhdpi/key_flag_sign.png
new file mode 100644
index 000000000..51ab367a9
--- /dev/null
+++ b/OpenKeychain/src/main/res/drawable-xxhdpi/key_flag_sign.png
diff --git a/OpenKeychain/src/main/res/layout/help_activity.xml b/OpenKeychain/src/main/res/layout/help_activity.xml
index 794964adb..7d3e1834c 100644
--- a/OpenKeychain/src/main/res/layout/help_activity.xml
+++ b/OpenKeychain/src/main/res/layout/help_activity.xml
@@ -1,5 +1,6 @@
 <?xml version="1.0" encoding="utf-8"?>
 <RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
+    xmlns:app="http://schemas.android.com/apk/res-auto"
     android:layout_width="match_parent"
     android:layout_height="match_parent">
 
@@ -9,15 +10,17 @@
 
     <LinearLayout
         android:layout_below="@id/toolbar"
-
         android:layout_width="match_parent"
         android:layout_height="match_parent"
         android:orientation="vertical">
 
-        <org.sufficientlysecure.keychain.ui.widget.SlidingTabLayout
+        <com.astuetz.PagerSlidingTabStrip
             android:id="@+id/sliding_tab_layout"
             android:layout_width="match_parent"
-            android:layout_height="wrap_content" />
+            android:layout_height="?attr/actionBarSize"
+            android:background="?attr/colorPrimary"
+            android:textColor="#FFFFFF"
+            app:pstsIndicatorColor="#FFFFFF" />
 
         <android.support.v4.view.ViewPager
             android:id="@+id/pager"
diff --git a/OpenKeychain/src/main/res/layout/view_key_activity.xml b/OpenKeychain/src/main/res/layout/view_key_activity.xml
index 10612f5a8..a2d104694 100644
--- a/OpenKeychain/src/main/res/layout/view_key_activity.xml
+++ b/OpenKeychain/src/main/res/layout/view_key_activity.xml
@@ -1,5 +1,6 @@
 <?xml version="1.0" encoding="utf-8"?>
 <RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
+    xmlns:app="http://schemas.android.com/apk/res-auto"
     android:layout_width="match_parent"
     android:layout_height="match_parent">
 
@@ -46,10 +47,13 @@
             android:visibility="gone"
             android:id="@+id/view_key_status_divider" />
 
-        <org.sufficientlysecure.keychain.ui.widget.SlidingTabLayout
+        <com.astuetz.PagerSlidingTabStrip
             android:id="@+id/view_key_sliding_tab_layout"
             android:layout_width="match_parent"
-            android:layout_height="wrap_content" />
+            android:layout_height="?attr/actionBarSize"
+            android:background="?attr/colorPrimary"
+            android:textColor="#FFFFFF"
+            app:pstsIndicatorColor="#FFFFFF" />
 
         <android.support.v4.view.ViewPager
             android:id="@+id/view_key_pager"
diff --git a/OpenKeychain/src/main/res/raw/help_start.html b/OpenKeychain/src/main/res/raw/help_start.html
index d54780491..75fe9de26 100644
--- a/OpenKeychain/src/main/res/raw/help_start.html
+++ b/OpenKeychain/src/main/res/raw/help_start.html
@@ -8,7 +8,7 @@ And don't add newlines before or after p tags because of transifex -->
 <h2>Getting started</h2>
 <p>First you need a personal key. Create one via the menu in "Keys" or import existing secret keys. Afterwards, you can download your friends' keys or exchange them via QR Codes or NFC.</p>
 
-<p>On Android lower 4.4, it is recommended that you install <a href="market://details?id=org.openintents.filemanager">OI File Manager</a> for enhanced file selection. To share via QR Codes install <a href="market://details?id=com.google.zxing.client.android">Barcode Scanner</a>. Clicking on the links will open Google Play Store or F-Droid for installation.</p>
+<p>On Android lower 4.4, it is recommended that you install <a href="market://details?id=org.openintents.filemanager">OI File Manager</a> for enhanced file selection.</p>
 
 <h2>I found a bug in OpenKeychain!</h2>
 <p>Please report the bug using the <a href="https://github.com/openpgp-keychain/openpgp-keychain/issues">issue tracker of OpenKeychain</a>.</p>
diff --git a/README.md b/README.md
index 10d07747c..991757169 100644
--- a/README.md
+++ b/README.md
@@ -220,6 +220,10 @@ Some parts and some libraries are Apache License v2, MIT X11 License (see below)
 * StickyListHeaders  
   https://github.com/emilsjolander/StickyListHeaders  
   Apache License v2
+  
+* https://github.com/jpardogo/PagerSlidingTabStrip
+
+* https://github.com/journeyapps/zxing-android-embedded
 
 ### Images
 * icon.svg