cat shell command - Android Android OS

Description

cat shell command
Demo Code


import java.io.BufferedReader;
import java.io.File;
import java.io.IOException;
import java.io.InputStreamReader;
import java.util.ArrayList;
import java.util.HashMap;
import java.util.LinkedHashMap;
import java.util.List;
import java.util.Map;
import android.util.Log;

public class Main{
    private static final String LOG_TAG = ShellHelper.class.getSimpleName();
    public static List<String> cat(String filename) {
        File f = new File(filename);
        if (!f.exists() || f.isDirectory())
            return null;
        List<String> list = new ArrayList<String>();
        try {// w w  w . j av a2s  .  c  o m
            list = exec("cat " + f.getAbsolutePath());
        } catch (IOException ignored) {
        } catch (SecurityException ignored) {
        }
        return list;
    }
    /**
     * Send a command to the shell.
     * @param command The command execute. 
     * @return A list of strings containing each line of the output.
     * @see java.lang.Runtime.getRuntime().exec()
     * @see java.io.BufferedReader.readLine()
     * @throws IOException if the requested command cannot be executed 
     *                      or if some other IOException occurs.
     */
    public static List<String> exec(String command) throws IOException,
            SecurityException {
        return exec(command, true);
    }
    /**   
     * @param trimOutput
     *       trim whitespace from the beginning and end of
     *        each line of the command output. Defaults to true.
     */
    public static List<String> exec(String command, boolean trimOutput)
            throws IOException, SecurityException {
        List<String> list = new ArrayList<String>();
        BufferedReader stdInput = null;
        try {
            Process p = Runtime.getRuntime().exec(command);
            stdInput = new BufferedReader(new InputStreamReader(
                    p.getInputStream()));
            String s;
            while ((s = stdInput.readLine()) != null) {
                if (trimOutput) {
                    s = s.trim();
                    if (s.length() != 0)
                        list.add(s);
                } else
                    list.add(s);
            }
        } catch (IOException e) {
            Log.e(LOG_TAG, "IOException occurred while executing '"
                    + command + "'.");
            throw e;
        } catch (SecurityException e) {
            Log.e(LOG_TAG, "SecurityException occurred while executing '"
                    + command + "'.");
            throw e;
        } finally {
            stdInput.close();
        }
        return list;
    }
}
cat shell command - Android Android OS

Description

Demo Code

Related Tutorials
