Utils.java

/*
 * Copyright (C) 2014 Jacob Klinker
 *
 * 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.klinker.android.launcher.hello_world;

import android.app.Activity;
import android.content.Context;
import android.content.res.Resources;
import android.graphics.Point;
import android.os.Build;
import android.util.TypedValue;
import android.view.Display;
import android.view.WindowManager;

import java.lang.reflect.Method;

/**
 * Common utils functions that you may want or need in your pages
 */
public class Utils {

    public static final String PACKAGE_NAME = "com.klinker.android.launcher.hello_world";

    private int statusBarHeight = -1;
    private int navBarHeight = -1;
    private int actionBarHeight = -1;

    private Activity context;

    public Utils(Activity context) {
        this.context = context;
    }

    public int getStatusBarHeight() {
        if (statusBarHeight == -1) {
            int resourceId = context.getResources().getIdentifier("status_bar_height", "dimen", "android");
            if (resourceId > 0) {
                statusBarHeight = context.getResources().getDimensionPixelSize(resourceId);
            }
        }

        return statusBarHeight;
    }

    public int getNavBarHeight() {
        if (navBarHeight == -1) {
            int resourceId = context.getResources().getIdentifier("navigation_bar_height", "dimen", "android");
            if (resourceId > 0) {
                navBarHeight = context.getResources().getDimensionPixelSize(resourceId);
            }
        }

        return navBarHeight;
    }

    public int getActionBarHeight() {
        if (actionBarHeight == -1) {
            TypedValue tv = new TypedValue();
            if (context.getTheme().resolveAttribute(android.R.attr.actionBarSize, tv, true)) {
                actionBarHeight = TypedValue.complexToDimensionPixelSize(tv.data, context.getResources().getDisplayMetrics());
            }
        }

        return actionBarHeight;
    }

    public boolean hasNavBar() {
        try {
            Class c = Class.forName("android.os.SystemProperties");
            Method m = c.getDeclaredMethod("get", String.class);
            m.setAccessible(true);
            String result = (String) m.invoke(null, "qemu.hw.mainkeys");
            boolean hasNav = !("1".equals(result));
            return hasNav;
        } catch (Throwable e) {
            return true;
        }
    }

    public int getListOffset() {
        return getStatusBarHeight() + getActionBarHeight();
    }

    public boolean isAndroidL() {
        return Build.VERSION.SDK_INT > Build.VERSION_CODES.KITKAT_WATCH;
    }

    public boolean isKitKat() {
        return Build.VERSION.SDK_INT >= Build.VERSION_CODES.KITKAT;
    }

    public float toPx(int dp) {
        Resources r = context.getResources();
        return TypedValue.applyDimension(TypedValue.COMPLEX_UNIT_DIP, dp, r.getDisplayMetrics());
    }

}