org.aminb.mathtools.app.activity.BaseActivity.java Source code

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Here is the source code for org.aminb.mathtools.app.activity.BaseActivity.java

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/*
 * BaseActivity.java
 * Copyright (C) 2014 Amin Bandali <me@aminb.org>
 *
 * MATHTools is free software: you can redistribute it and/or modify it
 * under the terms of the GNU General Public License as published by the
 * Free Software Foundation, either version 3 of the License, or
 * (at your option) any later version.
 *
 * MATHTools is distributed in the hope that it will be useful, but
 * WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
 * See the GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License along
 * with this program. If not, see <http://www.gnu.org/licenses/>.
 */

package org.aminb.mathtools.app.activity;

import android.app.ActionBar;
import android.graphics.drawable.ColorDrawable;
import android.graphics.drawable.Drawable;
import android.graphics.drawable.LayerDrawable;
import android.os.Build;
import android.os.Bundle;
import android.os.Handler;
import android.support.v4.app.FragmentActivity;

import org.aminb.mathtools.app.R;

public abstract class BaseActivity extends FragmentActivity {
    protected ActionBar mActionBar;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        mActionBar = getActionBar();

        if (!this.getClass().isAssignableFrom(ContentActivity.class))
            changeColor(R.color.mathtoolstheme_color);
    }

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

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

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

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

        }
    }

    private final Handler handler = new Handler();
    private Drawable.Callback drawableCallback = new Drawable.Callback() {
        @Override
        public void invalidateDrawable(Drawable who) {
            mActionBar.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);
        }
    };
}