Programatically install apk from assets folder in android

First use this
<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:paddingLeft="@dimen/activity_horizontal_margin"  
  android:paddingRight="@dimen/activity_horizontal_margin"  
  android:paddingTop="@dimen/activity_vertical_margin"  
  android:paddingBottom="@dimen/activity_vertical_margin"
  tools:context=".MainActivity">

 <TextView android:text="@string/hello_world" 
  android:layout_width="wrap_content"      
  android:layout_height="wrap_content" />

  <Button android:layout_width="wrap_content"   
    android:layout_height="wrap_content"      
    android:text="New Button"       
    android:id="@+id/button"      
    android:onClick="Installed_APK"    
    android:layout_centerVertical="true"   
    android:layout_centerHorizontal="true" />
</RelativeLayout>

Second use this in Activity class

public void Installed_APK(View view ){

AssetManager assetManager = getAssets(); 

   InputStream in = null;  
   OutputStream out = null;  
   try {
        in = assetManager.open("JellyJumpers.apk");   
        out = new FileOutputStream("/sdcard/JellyJumpers.apk");   
     byte[] buffer = new byte[1024];     
     int read;    
     while((read = in.read(buffer)) != -1) {
        out.write(buffer, 0, read);        }
        in.close();      
        in = null;      
        out.flush();     
        out.close();   
        out = null;     
        Intent intent = new Intent(Intent.ACTION_VIEW);    
        intent.setDataAndType(Uri.fromFile(new File("/sdcard/JellyJumpers.apk")),"application/vnd.android.package-archive");   

       startActivity(intent);   
     } catch(Exception e) {
  }
}

Finally use this in manifest

<uses-permission android:name="android.permission.READ_EXTERNAL_STORAGE" />

<uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE" />