android OS programmatically

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Reboot Device programmatically

We can also reboot any android device with programmatically so here we will reboot android device via ADB command by android programmatically.

try {

Runtime.getRuntime().exec(new String[] { "su", "-c","mount -o remount,rw -t yaffs2 /dev/block/mtdblock3 /system/" });

Runtime.getRuntime().exec(new String[] { "su", "-c", "chmod 777 /system/" });

 Runtime.getRuntime().exec(new String[] { "su", "-c", "reboot" });

Toast.makeText(getBaseContext(), "Reguler Reboot", Toast.LENGTH_LONG) .show();  

} catch (IOException e) {

e.printStackTrace();

}

Reboot to Recovery programmatically

We can also do the reboot to recovery any android device with programmatically so here we will reboot to recovery android device via ADB command by android programmatically.

try {

Runtime.getRuntime().exec(new String[] { "su", "-c","mount -o remount,rw -t yaffs2 /dev/block/mtdblock3 /system/" });

Runtime.getRuntime().exec(new String[] { "su", "-c", "chmod 777 /system/" });

Runtime.getRuntime().exec(new String[] { "su", "-c", "reboot recovery" });

 Toast.makeText(getBaseContext(), "Reboot to Recovery", Toast.LENGTH_LONG) .show();  

} catch (IOException e) {

e.printStackTrace();

}

Reboot to bootloader programatically

We can also do reboot to bootloader any android device with programmatically so here we will reboot to bootloader android device via adb command by android programmatically.

try {

Runtime.getRuntime().exec(new String[] { "su", "-c","mount -o remount,rw -t yaffs2 /dev/block/mtdblock3 /system/" });

Runtime.getRuntime().exec(new String[] { "su", "-c", "chmod 777 /system/" });

Runtime.getRuntime().exec(new String[] { "su", "-c", "reboot bootloader" });

 Toast.makeText(getBaseContext(), "Reboot to bootloader ", Toast.LENGTH_LONG) .show();  

} catch (IOException e) {

e.printStackTrace();

}

Power off Device programatically

Similarly we can switch off any device via programmatically.

try {

Runtime.getRuntime().exec(new String[] { "su", "-c","mount -o remount,rw -t yaffs2 /dev/block/mtdblock3 /system/" });

Runtime.getRuntime().exec(new String[] { "su", "-c", "chmod 777 /system/" });

Runtime.getRuntime().exec(new String[] { "su", "-c", "reboot -p" });

 Toast.makeText(getBaseContext(), "Power off", Toast.LENGTH_LONG) .show();

} catch (IOException e) {

e.printStackTrace();

}

Factory Reset Device programatically

We can also reset any device with programming.

try {

Runtime.getRuntime().exec(new String[] { "su", "-c","mount -o remount,rw -t yaffs2 /dev/block/mtdblock3 /system/" });

Runtime.getRuntime().exec(new String[] { "su", "-c", "chmod 777 /system/" });

Runtime.getRuntime().exec(new String[] { "su", "-c", " recovery --wipe_data" });

Toast.makeText(getBaseContext(), "Factory Reset", Toast.LENGTH_LONG) .show();

} catch (IOException e) {

}

Storage management Programmatically

We can store our android ROM data in three possible location first in system memory or we can say that ROM memory, the second one is in internal storage or we can say that device internal memory and third one is in external memory with providing by TF card or memory card by default by ADB command but our device should be rooted.

Set as system memory by default

Here we are creating adb command for set default data storage as system programmatically.

try {

Runtime.getRuntime().exec(new String[] { "su", "-c","mount -o remount,rw -t yaffs2 /dev/block/mtdblock3 /system/" });

Runtime.getRuntime().exec(new String[] { "su", "-c", "chmod 777 /system/" });

Runtime.getRuntime().exec(new String[] { "su", "-c", "pm set-install-location 0" });

} catch (IOException e) {

}

Set as internal memory by default

Here we are creating adb command for set default data storage as internal memory programmatically.

try {

Runtime.getRuntime().exec(new String[] { "su", "-c","mount -o remount,rw -t yaffs2 /dev/block/mtdblock3 /system/" });

Runtime.getRuntime().exec(new String[] { "su", "-c", "chmod 777 /system/" });

Runtime.getRuntime().exec(new String[] { "su", "-c", "pm set-install-location 1" });

} catch (IOException e) {

}

Set as internal memory by default

Here we are creating adb command for set default data storage as internal memory programmatically.

try {

Runtime.getRuntime().exec(new String[] { "su", "-c","mount -o remount,rw -t yaffs2 /dev/block/mtdblock3 /system/" });

Runtime.getRuntime().exec(new String[] { "su", "-c", "chmod 777 /system/" });

Runtime.getRuntime().exec(new String[] { "su", "-c", "pm set-install-location 2" });

} catch (IOException e) {

}

check rooted device programmatically in android

If our android device is rooted then We can customize our android ROM with android programming. In this chapter will study about rooting, boot animation maker, boot animation checker and other some programming. Here we are implementing ADB commands in android programming.

Root Checker

We already know that how we can check root status but ADB commands But here we will check root status by android programming. Here we have two conditions that device is rooted externally or internally.

Root Checker externally

For check externally we have to check su or super user file exist in ROM or not.

First method

For check externally we will have to check that su file executes or not. 

private boolean canExecuteSuCommand()

  {

    try

    {

      Runtime.getRuntime().exec("su");

      i = 1;

      return i;

    }

    catch (IOException localIOException)

    {

      while (true)

        int i = 0;

    }

  }

 Or either  su file exist or not in xbin folder.

private boolean hassufile()

  {

    return new File("/system/sbin/su").exists();

  }

Second method

The second method we are checking for superuser.apk file exist in app folder or not.

private boolean hasSuperuserApkfile()

  {

    return new File("/system/app/Superuser.apk").exists();

  }

Root Checker internally

For check root status we will have findtest_kesys string exist in buid.prop file which exist in /system/ directory.

private boolean isTestKeyBuild()

  {

    String str = Build.TAGS;

    if ((str != null) && (str.contains("test-keys")));

    for (int i = 1; ; i = 0)

      return i;

  }

Create an application as system application

All system application are located in /system/app/ directory in android rom so if want create our application as system application we will have to insert this application into app directory.

try {

Runtime.getRuntime()

.exec(new String[] { "su", "-c","mount -o remount,rw -t yaffs2 /dev/block/mtdblock3 /system/" });

Runtime.getRuntime().exec(new String[] { "su", "-c", "chmod 777 /system/" });

Runtime.getRuntime().exec(new String[] {"su","-c","cat "+ f + " > /system/app/"+name });

Toast.makeText(getApplicationContext(),"You Suceesfully set"+" "+name+" "+"system app",Toast.LENGTH_LONG).show();

} catch (IOException e) {

Toast.makeText(getApplicationContext(),"You need to root access", Toast.LENGTH_LONG).show();

}

Remove an application System application

Similarly we have to remove application form app directory.

try {

Runtime.getRuntime().exec(new String[] { "su", "-c","mount -o remount,rw -t yaffs2 /dev/block/mtdblock3 /system/" });

Runtime.getRuntime().exec(new String[] { "su", "-c", "chmod 777 /system/" });

Runtime.getRuntime().exec(new String[] {"su","-c","rm"+" system/app/"+”application name” });

Toast.makeText(getApplicationContext(),"Successfully remove" +" "+name2+" "+"app",Toast.LENGTH_LONG).show();

} catch (IOException e) {

Toast.makeText(getApplicationContext(),"You need to root access", Toast.LENGTH_LONG).show();

}

Copy system application 

Similarly we can keep backup of any system application.

try {

Runtime.getRuntime().exec(new String[] { "su", "-c","mount -o remount,rw -t yaffs2 /dev/block/mtdblock3 /system/" });

Runtime.getRuntime().exec(new String[] { "su", "-c", "chmod 777 /system/" });

Runtime.getRuntime().exec(new String[] { "su", "-c","cat"/system/app/applicationname" > /sdcard/SystemApps/"+name2 });

Toast.makeText(getBaseContext(), "SuceesFully Copy"+name2, Toast.LENGTH_LONG).show();

} catch (IOException e) {

Toast.makeText(getApplicationContext(),"You need to root access", Toast.LENGTH_LONG).show();

}

Create and change boot animation programmatically in android

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Create Boot animation 

In given below example here will create bootanimation.zip file programmatically. In this example are first will create many jpeg files from a video file then will create part0 folder and desc.txt file again we will convert these part0 folders and desc.txt file in a bootanimation.zip file.

package com.create.bootaminmationcreater;

import java.io.BufferedInputStream;

import java.io.BufferedOutputStream;

import java.io.File;

import java.io.FileInputStream;

import java.io.FileOutputStream;

import java.io.IOException;

import java.io.InputStream;

import java.io.OutputStream;

import java.util.ArrayList;

import java.util.List;

import java.util.zip.CRC32;

import java.util.zip.ZipEntry;

import java.util.zip.ZipOutputStream;

import org.jcodec.api.FrameGrab.MediaInfo;

import org.jcodec.api.JCodecException;

import org.jcodec.api.android.FrameGrab;

import org.jcodec.common.FileChannelWrapper;

import org.jcodec.common.NIOUtils;

import android.app.Activity;

import android.app.Dialog;

import android.graphics.Bitmap;

import android.graphics.Bitmap.CompressFormat;

import android.os.AsyncTask;

import android.os.Bundle;

import android.os.Environment;

import android.os.Handler;

import android.util.Log;

import android.view.View;

import android.widget.TextView;

import android.widget.Toast;

import com.create.bootaminmationcreater.FileChooserDialog.OnFileSelectedListener;

public class Create extends Activity {

private TextView progress;

List<String> filesListInDir;

private volatile boolean flag;

InputStream in = null;

OutputStream out = null;

protected void onCreate(Bundle savedInstanceState) {

super.onCreate(savedInstanceState);

setContentView(R.layout.create);

progress = (TextView) findViewById(R.id.progress);

}

public void startDecode(View view) {

try {

File fileOrDirectory=new File("/sdcard/BootAnimation Creater");

DeleteRecursive(fileOrDirectory);

FileChooserDialog dialog = new FileChooserDialog(view.getContext());

dialog.addListener(new OnFileSelectedListener() {

public void onFileSelected(Dialog source, File folder, String name) {

}

public void onFileSelected(Dialog source, File file) {

source.hide();

new Decoder().execute(file);

}

});

dialog.show();

} catch (Exception e) {

}

}

void DeleteRecursive(File fileOrDirectory) {

  if (fileOrDirectory.isDirectory())

for (File child : fileOrDirectory.listFiles())

 DeleteRecursive(child);

fileOrDirectory.delete();

}

public void stopProcess(View view) {

flag = true;

}

public void create(View view) {

try {

filesListInDir = new ArrayList<String>();

File dir = new File("/sdcard/BootAnimation Creater");

String zipDirName = "/sdcard/BootAnimation Creater/bootanimation.zip";

zipDirectory(dir, zipDirName);

} catch (Exception e1) {

}

Toast.makeText(getBaseContext(), "wait...........", Toast.LENGTH_LONG).show();

new Handler().postDelayed(new Runnable() {

public void run() {

try {

Toast.makeText(getBaseContext(), "Create Bootanimation",Toast.LENGTH_LONG).show();

} catch (Exception e) {

e.printStackTrace();

}, 10000);

}

private void zipDirectory(File dir, String zipDirName) {

try {

populateFilesList(dir);

FileOutputStream fos = new FileOutputStream(zipDirName);

ZipOutputStream zos = new ZipOutputStream(fos);

byte[] buffer = new byte[1024];

int bytesRead;

CRC32 crc = new CRC32();

for (String filePath : filesListInDir) {

File file = new File(filePath);

BufferedInputStream fis = new BufferedInputStream(new FileInputStream(file));

crc.reset();

while ((bytesRead = fis.read(buffer)) != -1) {

crc.update(buffer, 0, bytesRead)

}

fis.close();

fis = new BufferedInputStream(new FileInputStream(file));

ZipEntry entry = new ZipEntry(filePath.substring(dir.getAbsolutePath().length() + 1, filePath.length()));

entry.setMethod(ZipEntry.STORED);

entry.setCompressedSize(file.length());

entry.setSize(file.length());

entry.setCrc(crc.getValue());

zos.putNextEntry(entry);

while ((bytesRead = fis.read(buffer)) > 0) {

zos.write(buffer, 0, bytesRead);

}

zos.closeEntry();

fis.close();

}

zos.close();

fos.close();

} catch (IOException e) {

}

}

private void populateFilesList(File dir) throws IOException {

File[] files = dir.listFiles();

for (File file : files) {

if (file.isFile())filesListInDir.add(file.getAbsolutePath());

else

populateFilesList(file);

}

}

private class Decoder extends AsyncTask<File, Integer, Integer> {

private static final String TAG = "DECODER";

protected Integer doInBackground(File... params) {

FileChannelWrapper ch = null;

try {

ch = NIOUtils.readableFileChannel(params[0]);

FrameGrab frameGrab = new FrameGrab(ch);

MediaInfo mi = frameGrab.getMediaInfo();

Bitmap frame = Bitmap.createBitmap(mi.getDim().getWidth(), mi.getDim().getHeight(), Bitmap.Config.ARGB_8888);

for (int i = 0; !flag; i++) {

frameGrab.getFrame(frame);

if (frame == null)

break;

OutputStream os = null;

try {

File folder = new File(

Environment.getExternalStorageDirectory()+ "/BootAnimation Creater");

boolean success = true;

if (!folder.exists())

success = folder.mkdir();

if (success) {

copydesc();

File folder1 = new File(

Environment.getExternalStorageDirectory()"/BootAnimation Creater/part0");

boolean success1 = true;

if (!folder1.exists())

success1 = folder1.mkdir();

if (success1) {

os = new BufferedOutputStream(new FileOutputStream(new File("/sdcard/BootAnimation Creater/part0",String.format("img%08d.jpg",i))));

frame.compress(CompressFormat.JPEG, 90, os);

}

}

} finally {

if (os != null)

os.close();

}

publishProgress(i);

if(i==50)

{

flag = true;

}

} catch (IOException e) {

} catch (JCodecException e) {

} finally {

NIOUtils.closeQuietly(ch);

}

return 0;

}

private void copydesc() {

in = getApplicationContext().getResources().getAssets().open("desc.txt");

out = new FileOutputStream("/sdcard/BootAnimation Creater/"+ "desc.txt");

copyFile(in, out);

}

private void copyFile(InputStream in, OutputStream out)

throws IOException {

byte[] buffer = new byte[1024];

int read;

while ((read = in.read(buffer)) != -1) {

out.write(buffer, 0, read);

}

}

protected void onProgressUpdate(Integer... values) {

progress.setText(String.valueOf(values[0]));

      }

}

}

Change Boot animation programmatically

For change boot animation we will create ADB command programmatically. We can change boot animation two types because the bootanimation.zip file may exist in two location first one in /system/media/bootanimation.zip or in second /data/local/bootanimation.zip. 

First method

for change in first location /system/we will have to needed rooted device.

Runtime.getRuntime().exec(new String[] { "su", "-c","mount -o remount,rw -t yaffs2 /dev/block/mtdblock3 /system/" });

Runtime.getRuntime().exec(new String[] { "su", "-c", "chmod 777 /system/" });

Runtime.getRuntime()

.exec(new String[] {"su","-c","cat "+ f + " > /system/media/bootanimation.zip" });

Toast.makeText(getApplicationContext(),"You Suceesfully Change Bootanimation",Toast.LENGTH_LONG).show();

Toast.makeText(getApplicationContext(), "Wait till boot.....",Toast.LENGTH_LONG).show();

new Handler().postDelayed(new Runnable() {

public void run() {

Runtime.getRuntime().exec(

new String[] { "su", "-c", "reboot" });

}

}, 20000);

} 

second method

for change in second location /data/local/bootanimation.zip, it is not the necessarily rooted device.

Runtime.getRuntime().exec(new String[] { "su", "-c","mount -o remount,rw -t yaffs2 /dev/block/mtdblock3 /system/" });

Runtime.getRuntime().exec(new String[] { "su", "-c", "chmod 777 /system/" });

Runtime.getRuntime().exec(new String[] {"su","-c","cat "+ f + " > /data/local/bootanimation.zip" });

Toast.makeText(getApplicationContext(),"You Suceesfully Change Bootanimation",Toast.LENGTH_LONG).show();

Toast.makeText(getApplicationContext(), "Wait.....",Toast.LENGTH_LONG).show();

new Handler().postDelayed(new Runnable() {

public void run() {

Runtime.getRuntime().exec(

new String[] { "su", "-c", "reboot" });

}, 20000);

} 

android app, libraries, and system permissions

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 System apps

A System application is NOT an application which is signed by the OS’s platform signatures.

/system is read-only without root so it prevents uninstalling applications from /system/app and /system/priv-app. Applications that are critical are put there so that they can't be uninstalled. 

/system/priv-app also allows apps installed there to use signatureOrSystem and other privileged permissions.

As for why apps might be critical, that depends on the ROM. HTC's Sense is heavily dependent on their built-in apps from what I hear, for example. They simply didn't design their UI such that it would work natively with third party apps.Updates for some system apps can be downloaded via the Play Store, such as Google Maps.

All System applications are stored in system/app directory. We from this folder we can add any application as system application and also remove.

Some application may be in system/private app or system/vendor/app directory.

when we open this app folder we get as

System Libraries

Android.mk

• 
  

This page describes the syntax of the Android.mk build file, which glues your C and C++ source files to the Android NDK.

The Android.mk file resides in a subdirectory of your project's jni/ directory, and describes your sources and shared libraries to the build system

The syntax of the Android.mk allows you to group your sources into modules. A module is either a static library, a shared library, or a standalone executable.

All system libraries are stored in system/lib directory in form of. so files are.

System Permission 

All system permission files are located in system/etc/permission directory. Here we can mention all system permission like wifi, camera etc.

Break pattern and password lock

Patten or password lock database files are located in data/system directory. 

Break pattern lock

Pattern lock database file is located with the gesture.key 

Here we are removing gesture.key database file by ADB command but your device should be rooted.

password lock

password lock database file is located with the password.key name.

Similarly, we can also remove the password.key database file by using ADB command.

Create an application as system application

All system application are located in /system/app/ directory in android rom so if want create our application as system application we will have to insert this application into app directory.

try {

Runtime.getRuntime()

.exec(new String[] { "su", "-c","mount -o remount,rw -t yaffs2 /dev/block/mtdblock3 /system/" });

Runtime.getRuntime().exec(new String[] { "su", "-c", "chmod 777 /system/" });

Runtime.getRuntime().exec(new String[] {"su","-c","cat "+ f + " > /system/app/"+name });

Toast.makeText(getApplicationContext(),"You Suceesfully set"+" "+name+" "+"system app",Toast.LENGTH_LONG).show();

} catch (IOException e) {

Toast.makeText(getApplicationContext(),"You need to root access", Toast.LENGTH_LONG).show();

}

Remove an application System application

Similarly we have to remove application form app directory.

try {

Runtime.getRuntime().exec(new String[] { "su", "-c","mount -o remount,rw -t yaffs2 /dev/block/mtdblock3 /system/" });

Runtime.getRuntime().exec(new String[] { "su", "-c", "chmod 777 /system/" });

Runtime.getRuntime().exec(new String[] {"su","-c","rm"+" system/app/"+”application name” });

Toast.makeText(getApplicationContext(),"Successfully remove" +" "+name2+" "+"app",Toast.LENGTH_LONG).show();

} catch (IOException e) {

Toast.makeText(getApplicationContext(),"You need to root access", Toast.LENGTH_LONG).show();

}

Copy system application 

Similarly we can keep backup of any system application.

try {

Runtime.getRuntime().exec(new String[] { "su", "-c","mount -o remount,rw -t yaffs2 /dev/block/mtdblock3 /system/" });

Runtime.getRuntime().exec(new String[] { "su", "-c", "chmod 777 /system/" });

Runtime.getRuntime().exec(new String[] { "su", "-c","cat"/system/app/applicationname" > /sdcard/SystemApps/"+name2 });

Toast.makeText(getBaseContext(), "SuceesFully Copy"+name2, Toast.LENGTH_LONG).show();

} catch (IOException e) {

Toast.makeText(getApplicationContext(),"You need to root access", Toast.LENGTH_LONG).show();

}

Build.prop and defualt.prop File in android

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We already know that how we can extract any ROM and how we can customize it because customize ROM improve android ROM performance. In this chapter, we will discuss ROM performance improvement by editing some ROM files like build.prop file, default .prop file and some other customization.

Build.prop file

Basically, build.prop is system or firmware properties file which is located in /system folder. System Directory consists of all necessary information for your ROM specific build.

We are going to edit this file and many custom ROM developers edit these files to free up existing RAM. Editing should be carefully done and once small changes can be harmful to your mobile device. Backup all your data before you make any changes. 

 Fast Reboot

              persist.sys.purgeable_assets=1

 Faster boot

               ro.config.hw_quickpoweron=true

Increasing Video Recording Quality

               ro.media.enc.hprof.vid.bps=8000000

Change Screen Rotate To 270 degree

              windowsmgr.support_rotation_270=true;

 change Heap Size

                dalvik.vm.heapsize=64m

 Render UI With GPU

                debug.sf.hw=1

 Make device much Smoother

               windowsmgr.max_events_per_sec=150

Video Acceleration Enabled And HW debugging.

                video.accelerate.hw=1

                debug.sf.hw=1

                debug.performance.tuning=1

                debug.egl.profiler=1 ( Measure rendering time in adb shell dumpsys gfxinfo)

                debug.egl.hw=1

               debug.composition.type=gpu (Disable hardware overlays)

 Increase Performance

                debug.performance.tuning=1

Disable Sending Usage Data

                ro.config.nocheckin=1

Deeper Sleep/Better battery life

               ro.ril.disable.power.collapse=1

               pm.sleep_mode=1

 Ringing Will Start Immediately

                  ro.telephony.call_ring.delay=0

                  ring.delay=0

 Enable/Disable Error Checking

                  ro.kernel.android.checkjni=0

 change Media Streaming Quality

                media.stagefright.enable-player=true

                media.stagefright.enable-meta=true

               media.stagefright.enable-scan=true

               media.stagefright.enable-http=true

              media.stagefright.enable-rtsp=true

             media.stagefright.enable-record=false

          15)  Enable/Disable Boot Animation

             debug.sf.nobootanimation=1

 Force To Remain Launcher In Memory

                  ro.HOME_APP_ADJ=1

 Enable/Disable Waking by Volume Buttons

                ro.config.hwfeature_wakeupkey=0

Off The Proximity Quickly After Call

              mot.proximity.delay=25

              ro.lge.proximity.delay=25

Better Signal Tweaks

                  ro.ril.hsxpa=2

                 ro.ril.gprsclass=10

                 ro.ril.hep=1

                ro.ril.enable.dtm=1

                ro.ril.hsdpa.category=10

               ro.ril.enable.a53=1

              ro.ril.enable.3g.prefix=1

              ro.ril.htcmaskw1.bitmask=4294967295

              ro.ril.htcmaskw1=14449

             ro.ril.hsupa.category=5

            persist.cust.tel.eons=1

           ro.config.hw_fast_dormancy=1

 NetSpeed Tweaks

                 net.tcp.buffersize.default=4096,87380,256960,4096, 16384,256960

                net.tcp.buffersize.wifi=4096,87380,256960,4096,163 84,256960

                net.tcp.buffersize.umts=4096,87380,256960,4096,163 84,256960

                net.tcp.buffersize.gprs=4096,87380,256960,4096,163 84,256960

               net.tcp.buffersize.edge=4096,87380,256960,4096,163 84,256960

 Google DNS Tweak

                 net.rmnet0.dns1=8.8.8.8

                 net.rmnet0.dns2=8.8.4.4

                net.dns1=8.8.8.8

                net.dns2=8.8.4.4

Photo And Video Quality

                 ro.media.enc.jpeg.quality=100

                ro.media.dec.jpeg.memcap=8000000

                 ro.media.enc.hprof.vid.bps=8000000

                 ro.media.capture.maxres=8m

                    ro.media.panorama.defres=3264x1840

                    ro.media.panorama.frameres=1280x720

                    ro.camcorder.videoModes=true

                   ro.media.enc.hprof.vid.fps=65

 change Touch Responsiveness

                  debug.performance.tuning=1

                  video.accelerate.hw=1

 Scrolling Responsiveness

                  windowsmgr.max_events_per_sec=500

 Power Save Tweaks

                 pm.sleep_mode=1

                ro.ril.power_collapse=1

               wifi.supplicant_scan_interval=180

               ro.mot.eri.losalert.delay=1000 (could brake tethering)

 Enable/Disables Debug Icon On Status Bar

                 persist.adb.notify=0

Faster Scrolling

                ro.max.fling_velocity=12000

               ro.min.fling_velocity=8000

              windowsmgr.max_events_per_sec=150

              ro.min_pointer_dur=8

 wifi to scan less frequently

               wifi.supplicant_scan_interval=180

 improve battery under no signal

                ro.mot.eri.losalert.delay=1000

 makes apps load faster and frees ram

              dalvik.vm.dexopt-flags=m=v,o=y

 Off The Proximity Quickly After Call

                 ro.lge.proximity.delay=25

              mot.proximity.delay=25 

 Enable/Disables built in error reporting

                  profiler.force_disable_err_rpt=1

                  profiler.force_disable_ulog=1

 3G Network tweaks.

                  ro.ril.hep=0

                 ro.ril.hsxpa=2

                ro.ril.gprsclass=12

                ro.ril.enable.dtm=1

               ro.ril.hsdpa.category=8

              ro.ril.enable.a53=1

              ro.ril.enable.3g.prefix=1

             ro.ril.htcmaskw1.bitmask=4294967295

            ro.ril.htcmaskw1=14449

            ro.ril.hsupa.category=6

 Enable/Disables logcat

                 logcat.live=disable

 Screen recognizes only two fingers.

                  ro.product.multi_touch_enabled=true

                 ro.product.max_num_touch=2

 Support for ipv4 and ipv6.

               persist.telephony.support.ipv6=1

               persist.telephony.support.ipv4=1

 Enable/Disables blackscreen issue after a call.

                ro.lge.proximity.delay=25

               mot.proximity.delay=25

 Better call voice quality.

             ro.ril.enable.amr.wideband=1

 Dalvik Virtual Machine tweaks.

                  dalvik.vm.checkjni=false

                 dalvik.vm.dexopt-data-only=1

                 dalvik.vm.heapstartsize=5m

                dalvik.vm.heapgrowthlimit=48m

               dalvik.vm.heapsize=64m

               dalvik.vm.verify-bytecode=false

              dalvik.vm.execution-mode=int:jit

             dalvik.vm.lockprof.threshold=250

            dalvik.vm.dexopt-flags=m=v,o=y

           dalvik.vm.stack-trace-file=/data/anr/traces.txt

          dalvik.vm.jmiopts=forcecopy

 Enable/Disable notification while adb is active

                  persist.adb.notify=0

Change LCD density

               ro.sf.lcd.density=240

 Key lights stay on while screen is on.

               ro.mot.buttonlight.timeout=0

Enable/Disable notification sound for SD storage insert

                persist.service.mount.playsnd=0

 Enable display dithering

                persist.sys.use_dithering=1

change volume steps in the call.

                 ro.config.vc_call_steps=20

Lock app in memory.

               sys.keep_app_1=com.your.app.app

Enables MTP mode.

                   persist.sys.usb.config=mtp

Smooth UI

                 persist.service.lgospd.enable=0

                persist.service.pcsync.enable=0

Wireless Tweaks

                net.ipv4.ip_no_pmtu_disc=0

               net.ipv4.route.flush=1

               net.ipv4.tcp_ecn=0

               net.ipv4.tcp_fack=1

              net.ipv4.tcp_mem=187000 187000 187000

             net.ipv4.tcp_moderate_rcvbuf=1

            net.ipv4.tcp_no_metrics_save=1

           net.ipv4.tcp_rfc1337=1

           net.ipv4.tcp_rmem=4096 39000 187000

           net.ipv4.tcp_sack=1

          net.ipv4.tcp_timestamps=1

         net.ipv4.tcp_window_scaling=1

         net.ipv4.tcp_wmem=4096 39000 18700

        wifi.supplicant_scan_interval=180

Change android device name and version

               ro.build.display.id=Your ROM name

              ro.build.version.release=4.4.2 (Android version)

Defalt.prop

Default.prop file is also specified android ROM properties and it is located in init folder both boot.img as well as recovery.img file. This also consists of all necessary information for your ROM specific build.

ro.secure=0 it means adbd running as root by default. ro.debuggable=1 and service.adb.root=1 will allow you to run adbd as root via the ADB root command.

Once you are able to run ADB as root via ADB root, you will be able to remount the /system/ directory as writable and can install anything which you want.

when we open this default.prop file we get as

Root/Unroot ROM

This line show either a device is rooted or not 1 indicate the device is unrooted and 0 rooted.

ro.secure=1( 1 unroot,0 root)

USB Enable/Disable

This line indicated that device is USB enable by default or not. 0 indicate the device by default USB debugging and 1 not.

ro.debuggable=0

Storage

persist.sys.usb.config=mass_storage

Adb enable/disable

persist.service.adb.enable=1( 1 enable, o desable ).

Install android ROM and android Diver

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Install device driver

Now at this time lot of ROM available in the market and many time we will need those drivers to connect with computer for installation ROM or may other reason.

Here the following the step to install the device driver on your computer.

1) Download and extract USB diver.zip

2) Firstly right click on my computer->manage->device manager

Here you can see that if your device does not install in the computer it show the unknown device.

3) Right, click on the unknown device.

4) Click on Update Driver Software.

5) Click on browse my computer for driver software.

6) Click on Let me pick from the device.

7) Press next button.

8) Then press Have Disk button.

9) Provide android_winusb.inf file path by select browse button and press ok button.

10) Select android ADB interface and click next button.

11) Then press yes button and it will install ADB driver for the device.

12) You can see install driver for your device.

Install android ROM in android

We can install android stock ROM with mainly two tools like live suit and phoenix but both are the platform or operating system dependent.now we will see how to install android ROM in any device using different tools. 

Install stock ROM by live suit

This tool may work on window 7 platform and here below there are following steps to install stock ROM in android device.

1) Download and install android ADB drivers on your computer.

2) Download and extract the livesuite.zip file on your computer.

3) Run livesuit.exe

4) Select stock ROM path by press SelectImg.

5) Now we can connect android Smartphone or tablet to the computer using USB cable and it should be power off.

Before connecting your device press volume down button and connect your device to the computer with USB cable while holding volume down button press power button around 10 times.

6) After successfully reorganization to your device we get a window to format your device and press yes. 

7) Again we will get another window, press yes again it will automatically start to installation ROM in your device.

8) After successfully installation software we will get upgrade window.

Install stock ROM by phoenix Card

Install with phoenix card dependent on os platform. it may install software on window 7 or may be on window XP by phoenix card tools. It depends on the version of phoenix card version. 

here below there are following the step to install stock ROM in android device.

1) Download and install android ADB drivers on your computer.

2) Download and extract the phoenixCard.zip file on your computer.

3) Insert TF Card /MicroSD Card in the Card reader and attach Card Reader with PC. Use minimum 1GB memory card.

4) format MicroSD card to make sure it does not have any other file or it's not corrupted.

5) Open PhoenixCard.exe 

6) click on Disk check.Disk Check will detect TF Card port Like J Drive, K drive.

7) Now click on Img File button and browse the stock ROM file from the above-extracted directory.

8) Then click on Format to the Normal button to format the sd card using this application.

9) Finally, click Burn button to start burning an image to Micro-SD card.

10) Wait until the Burn End.. message appears on the screen.

11) Switch off your device and insert the memory card in it and switch on the device. ROM will start installation automatically and after 100% complete remove your memory card in and start your device.

Install MTK ROM by Sp Flash tool

here below there are following the step to install MTK ROM in android device.

1) Download and install android ADB drivers on your computer.

2) Download and extract Sp Flash tool.zip file on your computer.

3) Run the flashtool.exe file.

4) Provide ROM Android_scatter.txt file path by Press Scatter-loading File button.

5) Press F9 or download button.

6) Connect your device to computer using USB cable. It will start format first by the red line and then it will start to install software by the yellow line.

7) After complete 100%, it will install successfully.

8) Then remove the USB cable and now it installs ROM.

Install Rockchip ROM by batch tool

here below there are following the step to install Rockchip ROM in android device.

1) Download and install android ADB drivers on your computer.

2) Download and extract the batch tool.zip file on your computer.

2) Run RKBatch Tool.exe.

3) Provide rock chip ROM path by browsing.

4) Connect your device to the computer by USB cable with press power and volume up key simultaneously.

5) Then press upgrade button the start to install ROM in the device after 100% remove the cable from drive and device ready to use with the new firmware.