cn.psvmc.demo.MainActivity.java Source code

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Here is the source code for cn.psvmc.demo.MainActivity.java

Source

/*
 * 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 cn.psvmc.demo;

import android.app.ActionBar;
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.util.TypedValue;
import android.view.View;

import cn.psvmc.zjslidingtab.ZJSlidingTab;
import cn.psvmc.zjslidingtab.ZJTabViewPager;

public class MainActivity extends FragmentActivity {

    private final Handler handler = new Handler();

    private ZJSlidingTab tabs;
    private ZJTabViewPager pager;
    private MyPagerAdapter adapter;

    private Drawable oldBackground = null;
    private int currentColor = 0xFF3F9FE0;

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

        tabs = (ZJSlidingTab) findViewById(R.id.tabs);
        pager = (ZJTabViewPager) findViewById(R.id.pager);
        adapter = new MyPagerAdapter(getSupportFragmentManager());
        //pager?
        pager.setCanScroll(true);
        pager.setAdapter(adapter);

        final int pageMargin = (int) TypedValue.applyDimension(TypedValue.COMPLEX_UNIT_DIP, 0,
                getResources().getDisplayMetrics());
        pager.setPageMargin(pageMargin);

        tabs.setViewPager(pager);
        //?
        tabs.setIndicatorHeight(6);

        changeColor(currentColor);
        tabs.setSelectItem(2);
    }

    private void changeColor(int newColor) {
        tabs.setIndicatorColor(newColor);
        ActionBar actionbar = getActionBar();
        if (actionbar == null) {
            return;
        }
        // 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.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 });

                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);
    }

    private Drawable.Callback drawableCallback = new Drawable.Callback() {
        @Override
        public void invalidateDrawable(Drawable who) {
            ActionBar actionbar = getActionBar();
            if (actionbar != null) {
                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 = { "?", "?", "?", "?" };

        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) {
            Fragment1 view = Fragment1.newInstance("" + position);
            return view;
        }

    }
}