Get CPU Frequency Min Scaling : CPU « Hardware « Android

1. Android
2. Hardware
3. CPU

Get CPU Frequency Min Scaling

  

//package org.anddev.andengine.util;

import java.io.IOException;
import java.io.InputStream;
import java.lang.reflect.Method;
import java.util.Scanner;
import java.util.regex.MatchResult;

import android.content.Context;
import android.content.pm.PackageInfo;
import android.content.pm.PackageManager;
import android.content.pm.PackageManager.NameNotFoundException;
import android.os.Build;

/**
 * (c) 2010 Nicolas Gramlich 
 * (c) 2011 Zynga Inc.
 * 
 * @author Nicolas Gramlich
 * @since 15:50:31 - 14.07.2010
 */
class SystemUtils {
  private static final String BOGOMIPS_PATTERN = "BogoMIPS[\\s]*:[\\s]*(\\d+\\.\\d+)[\\s]*\n";
  private static final String MEMTOTAL_PATTERN = "MemTotal[\\s]*:[\\s]*(\\d+)[\\s]*kB\n";
  private static final String MEMFREE_PATTERN = "MemFree[\\s]*:[\\s]*(\\d+)[\\s]*kB\n";



  /**
   * @return in kiloHertz.
   * @throws SystemUtilsException
   */
  public static int getCPUFrequencyMinScaling() throws Exception {
    return SystemUtils.readSystemFileAsInt("/sys/devices/system/cpu/cpu0/cpufreq/scaling_min_freq");
  }

  private static int readSystemFileAsInt(final String pSystemFile) throws Exception {
    InputStream in = null;
    try {
      final Process process = new ProcessBuilder(new String[] { "/system/bin/cat", pSystemFile }).start();

      in = process.getInputStream();
      final String content = readFully(in);
      return Integer.parseInt(content);
    } catch (final Exception e) {
      throw new Exception(e);
    } 
  }
  public static final String readFully(final InputStream pInputStream) throws IOException {
    final StringBuilder sb = new StringBuilder();
    final Scanner sc = new Scanner(pInputStream);
    while(sc.hasNextLine()) {
      sb.append(sc.nextLine());
    }
    return sb.toString();
  }
  private static MatchResult matchSystemFile(final String pSystemFile, final String pPattern, final int pHorizon) throws Exception {
    InputStream in = null;
    try {
      final Process process = new ProcessBuilder(new String[] { "/system/bin/cat", pSystemFile }).start();

      in = process.getInputStream();
      final Scanner scanner = new Scanner(in);

      final boolean matchFound = scanner.findWithinHorizon(pPattern, pHorizon) != null;
      if(matchFound) {
        return scanner.match();
      } else {
        throw new Exception();
      }
    } catch (final IOException e) {
      throw new Exception(e);
    } 
      
  }
}

   
    
  

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