/*
* Copyright (C) 2012 The CyanogenMod 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 com.cyanogenmod.filemanager.util;
import android.content.Context;
import android.content.pm.PackageManager;
import android.content.res.Configuration;
import android.content.res.Resources;
import android.util.DisplayMetrics;
import android.view.ViewConfiguration;
import com.cyanogenmod.filemanager.R;
/**
* A helper class with useful methods for deal with android.
*/
public final class AndroidHelper {
/**
* Method that returns if the device is a tablet
*
* @param ctx The current context
* @return boolean If device is a table
*/
public static boolean isTablet(Context ctx) {
Configuration configuration = ctx.getResources().getConfiguration();
return (configuration.screenLayout & Configuration.SCREENLAYOUT_SIZE_MASK)
>= Configuration.SCREENLAYOUT_SIZE_LARGE;
}
/**
* Method that returns if an option menu has to be displayed
*
* @param ctx The current context
* @return boolean If an option menu has to be displayed
*/
public static boolean showOptionsMenu(Context ctx) {
// Show overflow button?
return !ViewConfiguration.get(ctx).hasPermanentMenuKey();
}
/**
* This method converts dp unit to equivalent device specific value in pixels.
*
* @param ctx The current context
* @param dp A value in dp (Device independent pixels) unit
* @return float A float value to represent Pixels equivalent to dp according to device
*/
public static float convertDpToPixel(Context ctx, float dp) {
Resources resources = ctx.getResources();
DisplayMetrics metrics = resources.getDisplayMetrics();
return dp * (metrics.densityDpi / 160f);
}
/**
* This method converts device specific pixels to device independent pixels.
*
* @param ctx The current context
* @param px A value in px (pixels) unit
* @return A float value to represent dp equivalent to px value
*/
public static float convertPixelsToDp(Context ctx, float px) {
Resources resources = ctx.getResources();
DisplayMetrics metrics = resources.getDisplayMetrics();
return px / (metrics.densityDpi / 160f);
}
/**
* Method that check if the app is signed with the platform signature
*
* @param ctx The current context
* @return boolean If the app is signed with the platform signature
*/
public static boolean isAppPlatformSignature(Context ctx) {
// TODO This need to be improved, checking if the app is really with the platform signature
try {
// For now only check that the app is installed in system directory
PackageManager pm = ctx.getPackageManager();
String appDir = pm.getApplicationInfo(ctx.getPackageName(), 0).sourceDir;
String systemDir = ctx.getString(R.string.system_dir);
return appDir.startsWith(systemDir);
} catch (Exception e) {
ExceptionUtil.translateException(ctx, e, true, false);
}
return false;
}
}