ViewpagerSlidingTabsActivity.java

/*
 * Copyright (C) 2013 Andreas Stuetz <andreas.stuetz@gmail.com>
 *
 * 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 com.marshalchen.common.demoofui.viewpagerSlidingTab;

import android.graphics.Color;
import android.graphics.drawable.ColorDrawable;
import android.graphics.drawable.Drawable;
import android.graphics.drawable.LayerDrawable;
import android.graphics.drawable.TransitionDrawable;
import android.os.Build;
import android.os.Bundle;
import android.os.Handler;
import android.support.v4.app.Fragment;
import android.support.v4.app.FragmentActivity;
import android.support.v4.app.FragmentManager;
import android.support.v4.app.FragmentPagerAdapter;
import android.support.v4.view.ViewPager;
import android.util.TypedValue;
import android.view.Menu;
import android.view.MenuItem;
import android.view.View;


import com.marshalchen.common.ui.PagerSlidingTabStrip;
import com.marshalchen.common.demoofui.R;

public class ViewpagerSlidingTabsActivity extends FragmentActivity {

    private final Handler handler = new Handler();

    private PagerSlidingTabStrip tabs;
    private ViewPager pager;
    private MyPagerAdapter adapter;

    private Drawable oldBackground = null;
    private int currentColor = 0xFF666666;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.viewpager_sliding_tabs_activity);

        tabs = (PagerSlidingTabStrip) findViewById(R.id.tabs);
        pager = (ViewPager) findViewById(R.id.pager);
        adapter = new MyPagerAdapter(getSupportFragmentManager());

        pager.setAdapter(adapter);

        final int pageMargin = (int) TypedValue.applyDimension(TypedValue.COMPLEX_UNIT_DIP, 4, getResources()
                .getDisplayMetrics());
        pager.setPageMargin(pageMargin);

        tabs.setViewPager(pager);

        changeColor(currentColor);
    }

    @Override
    public boolean onCreateOptionsMenu(Menu menu) {
        getMenuInflater().inflate(R.menu.view_pager_sliding_tab_menu, menu);
        return true;
    }

    @Override
    public boolean onOptionsItemSelected(MenuItem item) {

        switch (item.getItemId()) {

            case R.id.action_contact:
                QuickContactFragment dialog = new QuickContactFragment();
                dialog.show(getSupportFragmentManager(), "QuickContactFragment");
                return true;

        }

        return super.onOptionsItemSelected(item);
    }

    private void changeColor(int newColor) {

        tabs.setIndicatorColor(newColor);

        // change ActionBar color just if an ActionBar is available
        if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.HONEYCOMB) {

            Drawable colorDrawable = new ColorDrawable(newColor);
            Drawable bottomDrawable = getResources().getDrawable(R.drawable.view_sliding_tab_actionbar_bottom);
            LayerDrawable ld = new LayerDrawable(new Drawable[]{colorDrawable, bottomDrawable});

            if (oldBackground == null) {

                if (Build.VERSION.SDK_INT < Build.VERSION_CODES.JELLY_BEAN_MR1) {
                    ld.setCallback(drawableCallback);
                } else {
                    getActionBar().setBackgroundDrawable(ld);
                }

            } else {

                TransitionDrawable td = new TransitionDrawable(new Drawable[]{oldBackground, ld});

                // workaround for broken ActionBarContainer drawable handling on
                // pre-API 17 builds
                // https://github.com/android/platform_frameworks_base/commit/a7cc06d82e45918c37429a59b14545c6a57db4e4
                if (Build.VERSION.SDK_INT < Build.VERSION_CODES.JELLY_BEAN_MR1) {
                    td.setCallback(drawableCallback);
                } else {
                    getActionBar().setBackgroundDrawable(td);
                }

                td.startTransition(200);

            }

            oldBackground = ld;

            // http://stackoverflow.com/questions/11002691/actionbar-setbackgrounddrawable-nulling-background-from-thread-handler
            getActionBar().setDisplayShowTitleEnabled(false);
            getActionBar().setDisplayShowTitleEnabled(true);

        }

        currentColor = newColor;

    }

    public void onColorClicked(View v) {

        int color = Color.parseColor(v.getTag().toString());
        changeColor(color);

    }

    @Override
    protected void onSaveInstanceState(Bundle outState) {
        super.onSaveInstanceState(outState);
        outState.putInt("currentColor", currentColor);
    }

    @Override
    protected void onRestoreInstanceState(Bundle savedInstanceState) {
        super.onRestoreInstanceState(savedInstanceState);
        currentColor = savedInstanceState.getInt("currentColor");
        changeColor(currentColor);
    }

    private Drawable.Callback drawableCallback = new Drawable.Callback() {
        @Override
        public void invalidateDrawable(Drawable who) {
            getActionBar().setBackgroundDrawable(who);
        }

        @Override
        public void scheduleDrawable(Drawable who, Runnable what, long when) {
            handler.postAtTime(what, when);
        }

        @Override
        public void unscheduleDrawable(Drawable who, Runnable what) {
            handler.removeCallbacks(what);
        }
    };

    public class MyPagerAdapter extends FragmentPagerAdapter {

        private final String[] TITLES = {"Categories", "Home", "Top Paid", "Top Free", "Top Grossing", "Top New Paid",
                "Top New Free", "Trending"};

        public MyPagerAdapter(FragmentManager fm) {
            super(fm);
        }

        @Override
        public CharSequence getPageTitle(int position) {
            return TITLES[position];
        }

        @Override
        public int getCount() {
            return TITLES.length;
        }

        @Override
        public Fragment getItem(int position) {
            return SuperAwesomeCardFragment.newInstance(position);
        }

    }

}