mount Read Write - Android Android OS

Android examples for Android OS:Shell Command

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  4. Shell Command

Description

mount Read Write

Demo Code


import java.io.DataInputStream;
import java.io.DataOutputStream;
import java.io.File;
import android.content.pm.ApplicationInfo;
import android.content.pm.PackageManager.NameNotFoundException;
import android.util.Log;

public class Main{
    public static void mountRW() {
        String cmd = buildMountCommand();
        runCommand(cmd, true);/*from  w ww . jav  a  2  s .  c  o  m*/
    }
    public static String buildMountCommand() {
        String retstr = "";
        CommandResult ret = runCommand("mount", false);
        if (ret.error.equals("")) {
            String[] mt = ret.result.split("\n");
            for (String m : mt) {
                if (m.contains("/system")) {
                    String mstr = m;
                    mstr = mstr.replace(" on ", " ").trim();
                    String[] mele = mstr.split(" ");
                    int cnt = 0;
                    for (String me : mele) {
                        if (cnt >= 2) {
                            break;
                        }
                        if (!me.trim().equals("")) {
                            retstr = retstr + " " + me;
                            cnt++;
                        }
                    }
                    break;
                }
            }
        }
        if (!retstr.equals("")) {
            retstr = "mount -o remount,rw" + retstr;
        }
        return retstr;
    }
    @SuppressWarnings("deprecation")
    public static CommandResult runCommand(String command, boolean root) {
        if (GlobalInstance.DEBUG) {
            Log.e("runRootCommand", command);
        }
        Process process = null;
        DataOutputStream os = null;
        DataInputStream stdout = null;
        DataInputStream stderr = null;
        CommandResult ret = new CommandResult();
        try {
            StringBuffer output = new StringBuffer();
            StringBuffer error = new StringBuffer();
            if (root) {
                process = Runtime.getRuntime().exec("su");
                os = new DataOutputStream(process.getOutputStream());
                os.writeBytes(command + "\n");
                os.writeBytes("exit\n");
                os.flush();
            } else {
                process = Runtime.getRuntime().exec(command);
            }
            stdout = new DataInputStream(process.getInputStream());
            String line;
            while ((line = stdout.readLine()) != null) {
                output.append(line).append('\n');
            }
            stderr = new DataInputStream(process.getErrorStream());
            while ((line = stderr.readLine()) != null) {
                error.append(line).append('\n');
            }
            process.waitFor();
            ret.result = output.toString().trim();
            ret.error = error.toString().trim();
        } catch (Exception e) {
            ret.result = "";
            ret.error = e.getMessage();
        } finally {
            try {
                if (os != null) {
                    os.close();
                }
                if (stdout != null) {
                    stdout.close();
                }
                if (stderr != null) {
                    stderr.close();
                }
                // if (process != null) {
                // try {
                // process.destroy();
                // } catch (Throwable th) {
                //
                // }
                // }
            } catch (Exception e) {
                ret.result = "";
                ret.error = e.getMessage();
            }
        }
        if (GlobalInstance.DEBUG) {
            Log.e("runRootCommand-Result", String.format(
                    "result:%s, error:%s", ret.result, ret.error));
        }
        return ret;
    }
}

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