get IO Scheduler from Shell - Android Android OS

Android examples for Android OS:Shell

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Description

get IO Scheduler from Shell

Demo Code


import android.content.Context;
import android.content.pm.PackageManager;
import android.content.pm.PackageManager.NameNotFoundException;
import android.net.ConnectivityManager;
import android.net.NetworkInfo;
import android.os.SystemProperties;
import android.util.Log;
import android.widget.Toast;
import java.io.BufferedReader;
import java.io.File;
import java.io.FileNotFoundException;
import java.io.FileReader;
import java.io.FileWriter;
import java.io.IOException;
import java.util.Date;

public class Main{
    private static final String TAG = Thread.currentThread().getStackTrace()[1].getClassName();
    public static String getIOScheduler() {
        String scheduler = null;//from w ww. ja  v a 2 s  . c  o  m
        String[] schedulers = readStringArray("/sys/block/mmcblk0/queue/scheduler");
        if (schedulers != null) {
            for (String s : schedulers) {
                if (s.charAt(0) == '[') {
                    scheduler = s.substring(1, s.length() - 1);
                    break;
                }
            }
        }
        return scheduler;
    }
    private static String[] readStringArray(String fname) {
        String line = readOneLine(fname);
        if (line != null) {
            return line.split(" ");
        }
        return null;
    }
    public static String readOneLine(String fname) {
        BufferedReader br = null;
        String line = null;
        try {
            br = new BufferedReader(new FileReader(fname), 1024);
            line = br.readLine();
        } catch (FileNotFoundException ignored) {
            Log.d(TAG, "File was not found! trying via shell...");
            return readFileViaShell(fname, true);
        } catch (IOException e) {
            Log.d(TAG, "IOException while reading system file", e);
            return readFileViaShell(fname, true);
        } finally {
            if (br != null) {
                try {
                    br.close();
                } catch (IOException ignored) {
                    // failed to close reader
                }
            }
        }
        return line;
    }
    public static String readFileViaShell(String filePath, boolean useSu) {
        String command = new String("cat " + filePath);
        return useSu ? CMDProcessorAOKP.runSuCommand(command).getStdout()
                : CMDProcessorAOKP.runShellCommand(command).getStdout();
    }
}

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