Utils.java

/*
 * Copyright (C) 2012 The Android Open Source 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.wangbb.naruto.utils;

import android.annotation.SuppressLint;
import android.app.ActivityManager;
import android.app.ActivityManager.MemoryInfo;
import android.content.Context;
import android.graphics.Bitmap;
import android.os.Build;
import android.os.Environment;
import android.os.StatFs;

import java.io.BufferedReader;
import java.io.File;
import java.io.FileReader;
import java.io.IOException;


/**
 * Class containing some static utility methods.
 */
public class Utils {
    public static final int IO_BUFFER_SIZE = 8 * 1024;

    private Utils() {};

    /**
     * Workaround for bug pre-Froyo, see here for more info:
     * http://android-developers.blogspot.com/2011/09/androids-http-clients.html
     */
    public static void disableConnectionReuseIfNecessary() {
        // HTTP connection reuse which was buggy pre-froyo
        if (hasHttpConnectionBug()) {
            System.setProperty("http.keepAlive", "false");
        }
    }

    /**
     * Get the size in bytes of a bitmap.
     * @param bitmap
     * @return size in bytes
     */
    @SuppressLint("NewApi")
    public static int getBitmapSize(Bitmap bitmap) {
        if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.HONEYCOMB_MR1) {
            return bitmap.getByteCount();
        }
        // Pre HC-MR1
        return bitmap.getRowBytes() * bitmap.getHeight();
    }

    /**
     * Check if external storage is built-in or removable.
     *
     * @return True if external storage is removable (like an SD card), false
     *         otherwise.
     */
    @SuppressLint("NewApi")
    public static boolean isExternalStorageRemovable() {
        if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.GINGERBREAD) {
            return Environment.isExternalStorageRemovable();
        }
        return true;
    }

    /**
     * Get the external app cache directory.
     *
     * @param context The context to use
     * @return The external cache dir
     */
    @SuppressLint("NewApi")
    public static File getExternalCacheDir(Context context) {
        if (hasExternalCacheDir()) {
            return context.getExternalCacheDir();
        }

        // Before Froyo we need to construct the external cache dir ourselves
        final String cacheDir = "/Android/data/" + context.getPackageName() + "/cache/";
        return new File(Environment.getExternalStorageDirectory().getPath() + cacheDir);
    }

    /**
     * Check how much usable space is available at a given path.
     *
     * @param path The path to check
     * @return The space available in bytes
     */
    @SuppressLint("NewApi")
    public static long getUsableSpace(File path) {
        if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.GINGERBREAD) {
            return path.getUsableSpace();
        }
        final StatFs stats = new StatFs(path.getPath());
        return (long) stats.getBlockSize() * (long) stats.getAvailableBlocks();
    }

    /**
     * Get the memory class of this device (approx. per-app memory limit)
     *
     * @param context
     * @return
     */
    public static int getMemoryClass(Context context) {
        return ((ActivityManager) context.getSystemService(
                Context.ACTIVITY_SERVICE)).getMemoryClass();
    }

    /**
     * Check if OS version has a http URLConnection bug. See here for more information:
     * http://android-developers.blogspot.com/2011/09/androids-http-clients.html
     *
     * @return
     */
    public static boolean hasHttpConnectionBug() {
        return Build.VERSION.SDK_INT < Build.VERSION_CODES.FROYO;
    }

    /**
     * Check if OS version has built-in external cache dir method.
     *
     * @return
     */
    public static boolean hasExternalCacheDir() {
        return Build.VERSION.SDK_INT >= Build.VERSION_CODES.FROYO;
    }

    /**
     * Check if ActionBar is available.
     *
     * @return
     */
    public static boolean hasActionBar() {
        return Build.VERSION.SDK_INT >= Build.VERSION_CODES.HONEYCOMB;
    }
    
    public static long getAvailMemory(Context context) 
    {
        // ��ȡandroid��ǰ�����ڴ��С 
        ActivityManager am = (ActivityManager) context.getSystemService(Context.ACTIVITY_SERVICE);
        MemoryInfo mi = new MemoryInfo();
        am.getMemoryInfo(mi);
        //mi.availMem; ��ǰϵͳ�Ŀ����ڴ� 

        //return Formatter.formatFileSize(context, mi.availMem);// ����ȡ���ڴ��С��� 
        return mi.availMem/(1024*1024);
    }

    public static long getTotalMemory(Context context) 
    {
        String str1 = "/proc/meminfo";// ϵͳ�ڴ���Ϣ�ļ� 
        String str2;
        String[] arrayOfString;
        long initial_memory = 0;

        try 
        {
            FileReader localFileReader = new FileReader(str1);
            BufferedReader localBufferedReader = new BufferedReader(
            localFileReader, 8192);
            str2 = localBufferedReader.readLine();// ��ȡmeminfo��һ�У�ϵͳ���ڴ��С 

            arrayOfString = str2.split("\\s+");
//            for (String num : arrayOfString) {
//                Log.i(str2, num + "\t");
//            }

            initial_memory = Integer.valueOf(arrayOfString[1]).intValue() * 1024;// ���ϵͳ���ڴ棬��λ��KB������1024ת��ΪByte 
            localBufferedReader.close();

        } catch (IOException e) {
        }
        //return Formatter.formatFileSize(context, initial_memory);// Byteת��ΪKB����MB���ڴ��С��� 
        return initial_memory/(1024*1024);
    }
    
    public static long getNowTime() {
    	return System.currentTimeMillis() / 1000L;
    }
    
}