How to run Linux commands in Android application?

Today i am going explain how to run Linux commands in android application how it's use-full for developer i will clarify your doubts. Hope fully every body android is based Linux platform that means it will kernel and like as Linux if you know basic commands on linux it will run same as in android also suppose take one example i want directory of files that Files concept in java replacing we can get using simple "ls"  command it will give same out put . This post i will explain with example following is my source code.


MainActivity.java

package com.example.linuxcommand;

import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStreamReader;

import android.os.Bundle;
import android.support.v7.app.ActionBarActivity;
import android.util.Log;
import android.view.Menu;
import android.view.MenuItem;
import android.view.View;
import android.widget.Button;
import android.widget.EditText;
import android.widget.TextView;

public class MainActivity extends ActionBarActivity {

TextView tv;
EditText et;
Button bt;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
bt=(Button) findViewById(R.id.button1);
tv=(TextView) findViewById(R.id.textView2);
et=(EditText) findViewById(R.id.editText1);
bt.setOnClickListener(new View.OnClickListener() {

@Override
public void onClick(View v) {
Log.d("TAG", "This is onclick method");

String command= et.getText().toString();
tv.setText(command);
String output=LinuxRun(command);
tv.setText(output);
}


});
}

public String LinuxRun(String command) {
     StringBuffer retu = new StringBuffer();
     Log.d("TAG", "Linux coomand.."+command);
     Process p;
     try {
       p = Runtime.getRuntime().exec(command);
       p.waitFor();
       BufferedReader reader = new BufferedReader(new InputStreamReader(p.getInputStream()));
             String name = "";
       while ((name = reader.readLine())!= null) {
         retu.append(name + "\n");
       }
     } catch (Exception e) {
       e.printStackTrace();
     }
         String output = retu.toString();
     return output;
   }


@Override
public boolean onCreateOptionsMenu(Menu menu) {
// Inflate the menu; this adds items to the action bar if it is present.
getMenuInflater().inflate(R.menu.main, menu);
return true;
}

@Override
public boolean onOptionsItemSelected(MenuItem item) {
// Handle action bar item clicks here. The action bar will
// automatically handle clicks on the Home/Up button, so long
// as you specify a parent activity in AndroidManifest.xml.
int id = item.getItemId();
if (id == R.id.action_settings) {
return true;
}
return super.onOptionsItemSelected(item);
}

}

Above file is java file it consists of initialization if elements and out will show using TextView on screen


activity_main.xml

<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:paddingBottom="@dimen/activity_vertical_margin"
    android:paddingLeft="@dimen/activity_horizontal_margin"
    android:paddingRight="@dimen/activity_horizontal_margin"
    android:paddingTop="@dimen/activity_vertical_margin"
    tools:context="com.example.linuxcommand.MainActivity" >

    <EditText
        android:id="@+id/editText1"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_alignParentTop="true"
        android:layout_marginTop="26dp"
        android:layout_toRightOf="@+id/textView1"
        android:ems="10" >

        <requestFocus />
    </EditText>

    <TextView
        android:id="@+id/textView1"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_alignBaseline="@+id/editText1"
        android:layout_alignBottom="@+id/editText1"
        android:layout_alignParentLeft="true"
        android:text="Enter Command" />

    <Button
        android:id="@+id/button1"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_below="@+id/editText1"
        android:layout_marginTop="24dp"
        android:layout_toRightOf="@+id/textView1"
        android:text="output" />

    <ScrollView
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_alignRight="@+id/scrollView1"
        android:layout_below="@+id/button1"
        android:layout_marginTop="38dp" >

        <TextView
            android:id="@+id/textView2"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content" />
    </ScrollView>
         />


</RelativeLayout>



This is layout of main activity it having Text-view,Edit-text and Button after entering command in Edit-text when ever user press button it show out put on screen following are my screenshot of above code.

 The above screenshot is showing of "ls" command out put and i applied ScrollView to TextView it will increase based on output

The above screenshot is showing of "cat /proc/cpuinfo" it will show CPU information of Android mobile it will show CPU information 

Thank for studying please put comments and doubts of post i will improve next posts it will be very  use-full for me.