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Example-Custom Multiple Selection Spinner with Searching in android?
activity_maim.xml
xml version="1.0" encoding="utf-8"?>
<android.support.constraint.ConstraintLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:app="http://schemas.android.com/apk/res-auto"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    tools:context="com.project.mespl.multipleseleectspinner.MainActivity">


    <com.project.mespl.multipleseleectspinner.MultiSpinnerSearch
        android:id="@+id/searchMultiSpinner"
        android:layout_margin="20dp"
        android:layout_marginTop="20dp"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        app:layout_constraintBottom_toBottomOf="parent"
        app:layout_constraintLeft_toLeftOf="parent"
        app:layout_constraintRight_toRightOf="parent"
        app:layout_constraintTop_toTopOf="parent"/>

</android.support.constraint.ConstraintLayout>


 



MainActivity.java





import android.support.v7.app.AppCompatActivity;



import android.os.Bundle;



import android.util.Log;



import android.widget.Toast;







import java.util.ArrayList;



import java.util.Arrays;



import java.util.List;







public class MainActivity
extends AppCompatActivity {



    private static
final String TAG = "MainActivity";







    @Override    protected
void onCreate(Bundle savedInstanceState) {



        super.onCreate(savedInstanceState);



       
setContentView(R.layout.activity_main);







        ArrayList
list = new ArrayList<>();







        for (int i = 0; i
< 30; i++) {



            list.add(String.valueOf(i));



        }







        List
listArray0 = new ArrayList<>();







        for (int i = 0; i
< list.size(); i++) {



           
KeyPairBoolData h = new KeyPairBoolData();



           
h.setId(i + 1);



           
h.setName(list.get(i));



           
h.setSelected(false);



           
listArray0.add(h);



        }







       
MultiSpinnerSearch searchMultiSpinnerUnlimited = (MultiSpinnerSearch)
findViewById(R.id.searchMultiSpinner);



       
searchMultiSpinnerUnlimited.setItems(listArray0, -1, new SpinnerListener()
{







            @Override            public void
onItemsSelected(List items) {







                for (int i = 0; i
< items.size(); i++) {



                    if (items.get(i).isSelected())
{



                       
Log.i(TAG, i + " : " + items.get(i).getName() + " : " + items.get(i).isSelected());



                   
}



                }



            }



        });







    }







}















































































































Item List





















 Search View



















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Why we Used Manifest file in android App ?







Explain:-the manifest file in its root Directory.  Must every application Manifest File.The
manifest file provide all essential information about your app to the android
system.



1.      
Its name the java package for the application
.package name serves as a unique identifier for the application.



2.      
Described the components of the application,
which include the activites,services,broadcast receivers, and content providers
.



3.      
The classes that implement each of the
components and publishes the capabilities.



4.      
It determines the processes that host the
application component.



5.      
Declares the permissions that the application
must have in order to access protected parts of the API and interact with other
application.



6.      
It declares the minimum level of the Android API
that the application requires.















Here is an example of the Manifest file.






xml version=”1.” Encoding=”utf-8”?>

<manifest>

<uses-permission />

<permission />

<permission- group />

<instrumentation />

<uses-sdk />

<uses-configuraton />

<uses-feature />

<support-screen />

<support-gl-texture />



<application >

    <activity>

        <intent-filter>

            <action />

            <category />



            <data />

        </intent-filter>

    </activity>



    <activity–alias>

    <intent-filter />

    < Meta-data />

</activity–alias>





<service>

    <intent-filter />

    <mete-data />

</service>







<receiver>

    <intent-filter />

    <meta-data />

</receiver>



<provider
>

    <grant-uri-permission/>

    <path-permission />

    <meta-data />

</provider>



<uses-library
/>





</application>





    </manifest>











Action







Add action to an intent filter .for eg







<intent-filter>

<action android:name="android.intent.action.EDIT" />

<action android:name="android.intent.action.INSERT" />

<action android:name="android.intent.action.DELETE" />

</intent-filter>







An  element must contain multiple
  element.



But to assigine 
one of these action to the attribute







<action android:name="com.example.project.TRANSMOGRIFY"
/>











Activity-alias







 The target must be
in the same Application as the alias and it must be declared before the alias
in the manifest.










    android:exported=["true" |
"false"]

    android:icon="drawable
resource"

    android:label="string
resource"

    android:name="string"

    android:permission="string"

   
android:targetActivity="string" >

    . . .

    


 


 







Category







Adds a category name to an intent filter. See Intents
and Intent Filters for details on intent filters and the role of category
specifications within a filter.







Syntax-



<category android:name="string"
/>


 











Data







The specification can be just a data type (the
mimeType attribute), just a URI, or both a data type and a URI.







Syntax-







<data android:scheme="string"

    android:host="string"

    android:port="string"

    android:path="string"

    android:pathPattern="string"

    android:pathPrefix="string"

    android:mimeType="string"
/>






 


 



Grant-URI-Permission







Data subsets are indicated by the path part of a content:
URI. (The authority part of the URI identifies the content provider.) Granting
permission is a way of enabling clients of the provider that don't normally
have permission to access its data to overcome that restriction on a one-time
basis.







Syntax-



<grant-uri-permission android:path="string"

    android:pathPattern="string"

    android:pathPrefix="string"
/>







Instrumentation







Base class for implementing application
instrumentation code . class that enables you to monitor an application's
interaction with the system.







Syntax –







<instrumentation android:functionalTest=["true" | "false"]

android:handleProfiling=["true" | "false"]

android:icon="drawable resource"

android:label="string resource"

android:name="string"

android:targetPackage="string" />






 



Meta –Data







A name-value pair for an item
of additional, arbitrary data that can be supplied to the parent component. A
component element can contain any number of <meta-data> subelements.







Syntax-



<meta-data android:name="string"

    android:resource="resource
specification"

    android:value="string"
/>











Receiver







Declares a broadcast receiver
(a BroadcastReceiver subclass) as one of the application's components.
Broadcast receivers enable applications to receive intents that are broadcast
by the system or by other applications, even when other components of the
application are not running.







Syntax-



  <receiver android:directBootAware=["true" | "false"]

    android:enabled=["true" |
"false"]

    android:exported=["true" |
"false"]

    android:icon="drawable
resource"

    android:label="string
resource"

    android:name="string"

    android:permission="string"

    android:process="string"
>

     

</receiver>










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Example- How to Implement Material Spinner in android?











Step 1 - For normal look use






compile 'com.weiwangcn.betterspinner:library:1.1.0'


 



If you have appcompat-v7 in your dependencies make sure
to exclude it :



compile ('com.weiwangcn.betterspinner:library:1.1.0') {

    exclude group: 'com.android.support', module: 'appcompat-v7'

}















Step 2- Add View main_activity.xml.








<com.weiwangcn.betterspinner.library.BetterSpinner
    android:id="@+id/spinner_sp"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:background="@drawable/edittext_view"
    android:hint="@string/select"
    android:padding="8dp"

     />


 


 



Step 3- Find View id in MainActivity.Java.






public class MainActivity extends AppCompatActivity {
 String[] age = {"12", "13","14","15","16","17","18","19","20",};

    @Override

    protected void onCreate(Bundle savedInstanceState) {

        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);



        BetterSpinner Age_Sppiner = (BetterSpinner)


                                    findViewById(R.id.Age_Sppiner);



        ArrayAdapter arrayAdapterage = 


        new ArrayAdapter(listener, android.R.layout.


                                  simple_spinner_dropdown_item, age); 


                                
        Age_Sppiner.setAdapter(arrayAdapterage);


 

    }




}
























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Example- How to used HTML tag in TextView Programmatically. 



  I this tutorial explain how to design String Programmatically
























































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Security Tips for Android Applications.







Android has built-in security feature that significantly
reduce the frequency and impact of application security issue.







1.      
An application framework with robust
implementation of common security functionality such as cryptography ,permission.



2.      
Technologies like ASLR. NX, ProPolice , safe_iop
,OpenBSd DlMalloc, OpenBSD Calloc,risk associated with common memory Management
errors.



3.      
An Encrypted file system that can be enabled to
protect data on lost or stolen Devices.



4.      
Application-defined permission to control
application data on n application.



5.      
User granted permission to restrict access to system
feature and user data.











Storing Data







The most common security concern for an application on
android.



1.      
Internal Storage:-Avoid the MODE_WORLD_WRITEABLE
or MODE_WORLD_READABLE for IPC files because they do not provide the ability to
limit data access to particular application, nor do they provide any control of
data format. You can encrypt local files using a key that is not directly
accessible to the application.







2.  External Storage:-File created on external
storage, such as SD cards, are globally readable and Writable. Because external
storage can be removed by the user and also modified by any application .you
should not store executables or class files on external storage prior or dynamic
loading.







3.  Content Providers:-creating a content Provider
that is exported for use by other application, you can specify a single
permission for reading and writing, or you can specify distinct permission for
reading and writing. You should limit your permission to those required to
accomplish the task at hand. 











Permission







You should minimize the number of permission that your app
request. Restricting access to sensitive permission reduces the risk .your
application in a way that does not require any permission that is preferable.



Generally, you can create permission strive to define as few
permission as possible while satisfying your security requirement.















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Introduced Latest Android Version(8.0 Oreo).







The Android Oreo Luanch latest Android(8.0) version.Oreo
smarter ,faster,and more powerful.Android 8.0 (API level 26) introduces a
variety of new feature and capabilities for users and developers.











1.      
Picture-in-Picture mode:-PIP is a special type of multi-window mode
mostly used foe video playback.











2.      
Notifications:- 



(a)   
Notification channels:- that’s allow you to
create a user-cutomizable channel foe each type.of notification you want to
display.



(b)  
Notification dots:-Displaying dots,or badges
,on  app launcher icon.



(c)   
Snoozing:-Which causes them to disapper for a
priod of time before reappering.



(d)  
Notification timeout:-you can set a time when
creating a notification using SetTimeoutAfter().



(e)  
Notification settings:-you can call
setSettingTExt() set to the text.that appers when you create alink to your apps
notification settings .



(f)    
Notification:-User can dismiss notification themselves,and
apps can remove them programmatically.



(g)   
Background Colors:- you can set and enabled a
background color for a notification.



(h)  
Messaging style:- Use the MessagingStyle class
diplay more content in teir collapsed form.



3.      
Autofill Framwork:- User can save time filling
out forms by using autofill in their devices.filling forms , such as account
and credit card forms, easier with the introduction of the autofill framework.







4.      
Downloadable fonts:-Android support Library 26
introduce support for api to request fonts from a provide application instead
of bundling files into tha apk or letting athe apkdownload font.







5.      
 Shortcuts
Pinning:-you can create Pinned shortcuts. Unlike static and dynamic shortcuts,
pinned shortcuts appears in supported launchers as seprate icon.







6.      
Webview feature:-Android provides several Apis
to help you manage the Webview Objects that display web content in your app.







7.      
Fontin XML:- introduced a new feature, fonts in XML.you
can add the Font File in the res/font/   folder
to bundle fonts as resoures. Thes fonts are compiled in your R file and are
Automatically Available in Android Studio.







8.      
Adaptive icon:-Introduces adaptive launcher
icons, which can display a varity of sahpes across different device models. For
Example an adaptive launcher icon can display a circular shape on one OEM
device and display a squirecle o another device. Each device OEM provide a mask.
Which the system then used to render all adaptive icons with same shape.







9.      
Wide-gamut color:- To allow conversion between
color spaces, this implementation uses the CIE XYZ profile connection space(PCS).







10.  
 Multidisplay
Support:-the platform offers enhance support for multiple daiplays.if an
activity support  multi-window mode and
is running on a dvice with multiple display,users can move the activity from
one display to another.







11.  
Autosizing TextView:- you can set the size
ofyour text expand or contract automatically based on the size of the textView.
This means, it is much easier o potimize the text size on different screens or
with dynamic content.











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  • 14:00
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Read PDF file via assets folder in Android Studio





In this tutorial explain how to read pdf file assets folder.

I have used PDF Read Library .



Step 1. Create Android Project.



Step 2. Add Permission in Manifest file.




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





Step 3.Add dependencies .






compile 'com.github.barteksc:android-pdf-viewer:2.7.0-beta.1'







Step 4. Create activity_main.xml.






 



xml version="1.0" encoding="utf-8"?>

<LinearLayout
xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:app="http://schemas.android.com/apk/res-auto"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:orientation="vertical">

    <Button
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:text="Android Begginer Point"
        android:textAllCaps="true"
        android:textStyle="bold"
        android:textColor="#FF439934"

        />

    <com.github.barteksc.pdfviewer.PDFView

        android:id="@+id/pdfView"
        android:layout_width="match_parent"
        android:layout_height="match_parent" />

</LinearLayout>







Step 5. Create MainActivity.java.














import android.content.Context;
import android.content.Intent;
import android.content.res.AssetManager;
import android.graphics.Bitmap;
import android.graphics.pdf.PdfRenderer;
import android.net.Uri;
import android.os.Environment;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.view.View;
import android.widget.Button;
import android.widget.CheckBox;
import android.widget.TextView;
import android.widget.Toast;

import com.github.barteksc.pdfviewer.PDFView;

import java.io.File;
import java.io.FileNotFoundException;
import java.io.IOException;
import java.io.InputStream;
import java.io.OutputStream;

public class MainActivity extends AppCompatActivity {

    private static final String FILENAME = "sit.pdf";
    PDFView ReadTxt;
   
    @Override    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        ReadTxt=(PDFView)findViewById(R.id.pdfView);
        File file = new File(this.getCacheDir(), FILENAME);


        if (!file.exists()) {
            try {
                InputStream asset = this.getAssets().open(FILENAME);
                ReadTxt.fromStream(asset)
                        .pages(0, 2, 1, 3, 3, 3)
                        .enableSwipe(true)
                        .swipeHorizontal(false)
                        .enableDoubletap(true)
                        .defaultPage(0)
                        .enableAnnotationRendering(false)
                        .password(null)
                        .scrollHandle(null)
                        .enableAntialiasing(true)
                        .spacing(0)
                        .load();
            } catch (Exception e) {
                e.printStackTrace();
            }
        }else {
           Toast.makeText(getApplicationContext(),


"File not found",Toast.LENGTH_LONG).show();
        }
    }

    @Override    protected void onStart() {
        super.onStart();
    }

}



try this.........










































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  • 11:26
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In this tutorial explain how to Create / Delete Multiple text
file Inside Root Folder  and every text
file Size is 5Mb . 






private File createEVENTFileWriter() {

    File filelog = null;

    try {

        String root = Environment.getExternalStorageDirectory().toString();
        File myDir = new File(root + "/" + log_foldereventname);
        myDir.mkdirs();
        String h = DateFormat.format("MM-dd-yyyyy ss",System.currentTimeMillis()).toString();
        filelog = new File(myDir, log_filenameevent);
        filelog.createNewFile();
        long fileSizeInBytes = filelog.length();
        long fileSizeInKB = fileSizeInBytes / 1024;

        if (fileSizeInKB > 5000) {

            File from = new File(myDir, log_filenameevent);
            File to = new File(myDir, h + log_filenameevent);
            if (from.exists()) {
                from.renameTo(to);

            }
        }

    } catch (Exception err) {
        fileWriteCreationFailed = true;
        err.printStackTrace();
    }
    return filelog;

}


 





public
void DeletOlderFolder() {

    String root = Environment.getExternalStorageDirectory().toString();

    File myDir = new File(root + "/" + log_foldereventname);

    myDir.mkdirs();

    File list[] = myDir.listFiles();

    for (int i = 0; i < list.length; i++) {

        long diff = new Date().getTime() -
list[i].getAbsoluteFile().lastModified();

        if (diff >  3 * 24
* 60 * 60 * 1000) {//3 * 24 * 60 * 60 * 1000(3days)

            list[i].getAbsoluteFile().delete();

        }

    }








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Explain- The Log file delete alternate in  3 days.




import android.content.Context;
import java.io.BufferedWriter;
import java.io.File;
import java.io.FileWriter;
import java.io.IOException;
import java.util.Date;




public class LogFile {

    Context context;

     public LogFile ( ) {

        DeletOlderFolder();
    }



    public void DeletOlderFolder(){

        File file=new File("sdcard/LoungeLogFile.txt");

        if(file != null) {

            long diff = new Date().getTime() - file.lastModified();

            if (diff > 3 * 24 * 60 * 60 * 1000) {

                file.delete();

            }

        }

    }

}


 


 






public class MainActivity extends Activity  {


 


@Override

protected void onCreate(Bundle savedInstanceState) {

    super.onCreate(savedInstanceState);


 


 


new LogFile (); // Delete Log file in 3 days


 


 


}


}














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Explain-  write Log file programmatically in android.







 

import android.content.Context;



import java.io.BufferedWriter;

import java.io.File;

import java.io.FileWriter;

import java.io.IOException;

import java.util.Date;





public class LogClass {

    Context context;



    public LogClass(Context
context, String text) {

       this.context=context;

        LogFile(text);

        DeletOlderFolder();

    }



    public  void LogFile( String text){



            File logFile = new File("sdcard/LoungeLogFile.txt");

            if
(!logFile.exists()) {

                try {

                   
logFile.createNewFile();

                }catch (IOException e){

                    e.printStackTrace();

                }

            }

            try
{

                BufferedWriter buf = new BufferedWriter(





                                    new FileWriter(logFile, true));

                buf.append(text);

                buf.newLine();

                buf.close();

            } catch (IOException
e) {

                e.printStackTrace();

            }



    }

 }








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