But if you want to add another project as a library in your application. For that, you need to add that library project to your application as a module dependency.

1. Open Your Project in Android Studio.

2. You will find the two main directory name samples and others.

3. Go to Android Studio and navigate to File -> New -> Import Module -> Select the library path -> Finish.

4. Import-Module form Directory.

5. Then right-click on the App directory -> Open Module Settings -> Dependencies -> Click on + button inside Declared Dependencies -> Module Dependency -> Select your library -> Ok.

Another way to add Module Dependency:-

• Open build.gradle Of the main module

  dependencies {
  
  implementation project(":sample")
  
  }

There can be a situation when we need to modify the library code according to our requirement then in that case we can follow this method.

Hi everyone, in this post, we will discuss Room Database in android java.

Below are all steps covered in this blog

• How to use the Room database
• How to add Room Database in android studio
• Insert,Update,Delete record
• How to pass query in Database

What is Room?

• The Room strong library provides an abstraction layer over SQLite to allow for more robust database access while harnessing the full power of SQLite.
• Normally Room database is fast created and has good performance like reading, update and deleted records. Room Database makes everything easy and fast
• Room Database more detail open this link: https://developer.android.com/training/data-storage/room/

Components of Room Here room have main 3 components

Entity:

• Instead of creating the SQLite table, we will create the Entity. An entity is nothing but a model class annotated with @Entity. The variables of this class are our columns, and the class is our table.

Database:

• It is an abstract class where we define all our entities.

DAO:

• Stands for Data Access Object. It is an interface that defines all the operations that we need to perform in our database.

Demo App Create

• First, we create a new project in android studio.
• Name of my project "Room DataBase"

Adding Dependencies

• Add needed dependencies for room database.
• Android studio in this file in add dependencies "build.gradle".
• See the below image and add the latest version room database replace here "$room_version" add original version

First we will create DAO class:

• This DAO class-main work intermediary between the user and database. All performed operations define here.

• Below create StudentDao class

  @Dao
  public interface StudentDao {
  
  @Query("SELECT * FROM Student")
  List<Student> getAll();
  
  @Insert
  void insert(Student student);
  
  @Update
  void updateTask(Student student);
  
  @Delete
  void deleteTask(Student student);
  }

Nowhere explain all components of StudentDao Class

• Compulsory add class upper "@Dao" keyword
• Three methods create insert, update, delete
• Most important thing here is "@Query"

What is Query?

• Using query get database exiting record.
• @Query("SELECT * FROM Student") this query get all student record.
• But the user wants to get the only the stander is "5" student record only get how to pass query?

    @Query("SELECT * FROM STUDENT where std = :std")

    List<Student> dataCheck(String std);

• Here "std" id table field name
• Call this method "data check(String std)" pass a string in "5" and database in getting only 5 stander student record
• so this concept use the query parameter

Second steps create student model class

@Entity(tableName = "student")
public class Student implements Serializable {

@PrimaryKey(autoGenerate  = true)
private int id;

@ColumnInfo(name = "std")
private int std;

@ColumnInfo(name = "name")
private String name;

public int getId() {
    return id;
  }

public void setId(int id) {
    this.id = id;
  }

public int getStd() {
    return std;
  }

public void setStd(int std) {
    this.std = std;
  }

public String getName() {
    return name;
  }

public void setName(String name) {
    this.name = name;
  }
}

• PrimaryKey : auto increment values
• tableName : user want to set table name
• ColumnInfo : give tabel in columns name

Third steps Create Database class:

@Database(entities = {Student.class}, version = 1)
public abstract class AppDatabase extends     RoomDatabase {
public abstract Student studentDao();
}

• User want to add multipal table how can add like that:

  @Database(entities = {Student.class,Abc.class,Xyz.class}, version = 1) public abstract class AppDatabase extends RoomDatabase { public abstract Student studentDao(); }

• So create a new model class like Abc.class and Xyz.class etc same method use.

Fourth step insert,update and delete record create separate method:

• But implements upper all method in understanding asynctask
• You not known whats is asynctask first open this link and check it: https://developer.android.com/reference/android/os/AsyncTask
• how we will create a common class method insert,update, delete

 public class InsertUpdateDeletRecord {

    private String DB_NAME = "db_task";

    private Student Student;
    public studentRepository(Context context) {
        Student = Room.databaseBuilder(context, Student.class, DB_NAME).build();
    }

    public void insertTask(String std,String name) {

        insertTask(std, name);
    }

    public void insertTask(String std,String name) {
        Student student = new Student();
        student.setstd(std);
        student.setname(name);

        insertTask(student);
    }

    public void insertTask(final Student student) {
        new AsyncTask<Void, Void, Void>() {
            @Override
            protected Void doInBackground(Void... voids) {
                Student.daoAccess().insertTask(student);
                return null;
            }
        }.execute();
    }

    public void updateTask(final Student student) {
        student.setModifiedAt(AppUtils.getCurrentDateTime());

        new AsyncTask<Void, Void, Void>() {
            @Override
            protected Void doInBackground(Void... voids) {
                Student.daoAccess().updateTask(student);
                return null;
            }
        }.execute();
    }

    public void deleteTask(final int id) {
        final LiveData<student> task = getTask(id);
        if(task != null) {
            new AsyncTask<Void, Void, Void>() {
                @Override
                protected Void doInBackground(Void... voids) {
                    Student.daoAccess().deleteTask(task.getValue());
                    return null;
                }
            }.execute();
        }
    }

    public void deleteTask(final student student) {
        new AsyncTask<Void, Void, Void>() {
            @Override
            protected Void doInBackground(Void... voids) {
                Student.daoAccess().deleteTask(student);
                return null;
            }
        }.execute();
    }

 }

Sample Implementation of basic CRUD operations using ROOM

Insert:

 InsertUpdateDeletRecord 
 insertUpdateDeletRecord = new 
 InsertUpdateDeletRecord(getApplicationContext( ));
 String std = "5";
 String name = Android";
 insertUpdateDeletRecord.insertTask(title, 
 description);

Update:

 InsertUpdateDeletRecord 
 insertUpdateDeletRecord = new 
 InsertUpdateDeletRecord(getApplicationContext( ));
 Student student = 
 insertUpdateDeletRecord.getTask(2);
 student.setName("Java");
 student.setStd("6");
 insertUpdateDeletRecord.updateTask(student);

Update:

 InsertUpdateDeletRecord 
 insertUpdateDeletRecord = new 
 InsertUpdateDeletRecord(getApplicationContext());
 insertUpdateDeletRecord.deleteTask(3);

Dear, Friend in this blog we discussion google ad integration. Many companies work in client base & product base. Product base company in very very important ad integration in the app. Multiple types of AD available like a Facebook ad, start-up ad, google ad, etc. Today we learning google ad integration. 

Type of Google AD:

• Banner AD
• Interstitial Ad
• Rewarded Video Ad
• Native Ad

1.Banner Ad

- Banner Ads occupy only a portion of the screen depending on the ad size that is created. It comes in multiple sizes Standard, Medium, Large, Full-Size, Leaderboard, and Smart Banner. Smart banners are very useful when you target multiple device sizes and fit the same ad depending on the screen size.

2.Interstitial Ads

- Interstitial ads occupy the full screen of the app. Basically, they will show on a timely basis, between screen transition or when the user is done with a task.

Open AndroidManifest.xml and add MyApplication to tag.

<meta-data
    android:name="com.google.android.gms.ads.APPLICATION_ID"
    android:value="ca-app-pub-3940256099942544/6300978111"/>

Basically, it works like a stack where each view is stacked on top of the other.

Create a drawable file for shadow view and assign the name image_shadow and add the below code in this file.

<?xml version="1.0" encoding="utf-8"?>
<shape xmlns:android="http://schemas.android.com/apk/res/android"
    android:shape="rectangle">
    <corners android:radius="10dp" />
    <gradient
    android:angle="270"
    android:centerX="300%"
    android:endColor="#99000000"
    android:startColor="#00000000"
    android:type="linear" />
    <size
    android:width="270dp"
    android:height="60dp" />
    <stroke
    android:width="1dp"
    android:color="#878787" />
</shape>

Now, open xml file and add the below code into it, and set this drawable file as view background.

<androidx.appcompat.widget.LinearLayoutCompat
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"
xmlns:app="http://schemas.android.com/apk/res-auto"
tools:context=".MainActivity">
<androidx.constraintlayout.widget.ConstraintLayout
    android:layout_width="match_parent"
    android:layout_height="match_parent">
    <androidx.appcompat.widget.AppCompatImageView
        android:id="@+id/imageView"
        android:layout_width="250dp"
        android:layout_height="250dp"
        android:scaleType="centerCrop"
        android:src="@drawable/shopping_image"
        app:layout_constraintTop_toTopOf="parent"
        app:layout_constraintEnd_toEndOf="parent"
        app:layout_constraintStart_toStartOf="parent"
        app:layout_constraintBottom_toBottomOf="parent"/>
    <View android:id="@+id/view"
        android:layout_width="250dp"
        android:layout_height="250dp"
        android:background="@drawable/image_shadow"
        app:layout_constraintTop_toTopOf="parent"
        app:layout_constraintEnd_toEndOf="parent"
        app:layout_constraintStart_toStartOf="parent"
        app:layout_constraintBottom_toBottomOf="parent"/>
    <androidx.appcompat.widget.AppCompatTextView
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_margin="10dp"
        android:textColor="@android:color/white"
        android:text="Write your text here"
        android:textSize="25sp"
        app:layout_constraintStart_toStartOf="parent"
        app:layout_constraintEnd_toEndOf="parent"
        app:layout_constraintBottom_toBottomOf="@+id/view"/>
</androidx.constraintlayout.widget.ConstraintLayout>
</androidx.appcompat.widget.LinearLayoutCompat>

That's it. You should be ready to go.

dependencies {
    implementation "com.google.android.material:$latest_version"
}

Snackbar.make(view, "Show some message here", Snackbar.LENGTH_SHORT).show()

<?xml version="1.0" encoding="utf-8"?>
<android.support.design.widget.CoordinatorLayout 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:id="@+id/coordinatorLayout"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    tools:context="com.example.application.snackbarapp.MainActivity">

    <RelativeLayout
        android:layout_width="match_parent"
        android:layout_height="match_parent">

        <Button
            android:id="@+id/button"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:layout_centerHorizontal="true"
            android:layout_centerVertical="true"
            android:text="show snackbar" />

    </RelativeLayout>

</android.support.design.widget.CoordinatorLayout>

import android.graphics.Color;
import android.support.design.widget.CoordinatorLayout;
import android.support.design.widget.Snackbar;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.view.View;
import android.widget.Button;
import android.widget.TextView;

public class MainActivity extends AppCompatActivity {
    private CoordinatorLayout coordinatorLayout;
    private Button button;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);

        coordinatorLayout = findViewById(R.id.coordinatorLayout);
        button = findViewById(R.id.button);

        button.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                showSnackbar();
            }
        });
    }

    public void showSnackbar() {
        Snackbar snackbar = Snackbar.make(coordinatorLayout, "Marked as Read", Snackbar.LENGTH_INDEFINITE)
                .setAction("UNDO", new View.OnClickListener() {
                    @Override
                    public void onClick(View v) {
                        Snackbar snackbar1 = Snackbar.make(coordinatorLayout, "Undo successful", Snackbar.LENGTH_SHORT);
                        snackbar1.show();
                    }
                })
                .setActionTextColor(Color.RED);

        snackbar.show();
    }
}

• Debug APK is very fast in building and Release APK is a little bit slow.

How to create Release APK File:

• Flowing below all steps 
• Open android studio
• Click Build on the toolbar
• Click Generate Signed Bundle/APK.

  

•  Select APK 
• Click the Next button

  

• After clicking the next button, you will see the following dialog.
• Click the "Create new..." button, highlighted in the following image by a red circle if you are creating an APK for the first time. Otherwise, you can choose from existing.

  

• It will open one another dialog box
• Key store path in select save location .jks file 
• Fill in all the information
• Set a valid name for key alias
• Set 100 as validity years
• Fill Certificate Information
• Click OK

• After you click on it, select "release" from the dialog box 
• Select "V1 (Jar Signature)" & "V2 (Full APK Signature)" checkboxes
• Click Finish
• It will start the process of building your APK

How to create a debug .apk file

• Click Build and select Build Bundles(s)/APK(s) 
• select "Build APK(s)" from the dialog box 
• It will start the process of building your debug APK file creating 

We will learn to run the app without connecting a USB cable in this blog. The main purpose of this blog is to let users run apps without any restriction. Sometimes if the cable is connected with the device and if the device cable gets disturbed then the app not run properly.

Let's see how we can run the app without cable.

Step 1: Click File Menu => Settings

Step 2: Click Plugins

Step 3: Install ADB Wi-Fi Plugin

Notes:

• In the third image, I already installed the plugin in my android studio. But in your case, you may need to install it.
• Then your android studio restart.

After the restart, your android studio will show the "ADB Wifi" option showing as per the following image

Click ADB Wifi and the below screen will be displayed.

• Click to connect 
• Make sure your device and pc are connected to the same wifi. Otherwise, it will not get connected.
• You will need to connect one time when the android studio is opened the first time.

Search Keys :

• Shift+Shift — Search Every Where
• Ctrl+F — Find Text within a Single File
• Ctrl+Shift+F-Find Text in All Files
• Ctrl+R — Replace Selected Text in a Single File
• Ctrl+Shift+R — Replace Selected Text in all Files (Be Careful while Using This)
• Ctrl+Shift+A —Search for IDE Commands

• Ctrl+N — Navigate to Class
• Ctrl+Shift+N — Navigate to a File
• Ctrl+B — Jump to Declarations
• Alt+ ↑ — Jump to the Previous Method
• Alt+↓ — Jump to Next Method
• Ctrl+G — Jump to Line
• Ctrl+E — Recent Files
• Ctrl+Shift+Back Space — Jump to Last Edited Location
• Ctrl+B — Find Declarations
• Ctrl+Left Mouse(or)Ctrl+Alt+F7— Show Usage
• Alt + F7 / Ctrl + F7 — Find usages /Find usages in file
• Ctrl+Shift+B — Find Implementations
• F3 — Find Next
• Shift+F3 — Find Previous

• F11 — Toggle bookmark
• Ctrl+F11 — Toggle bookmark with the mnemonic(0–9 or A-Z)
• Ctrl +(0–9) — Go to numbered bookmark
• Shift+F11 — Show all Bookmarks
• Ctrl + Shift + F7 — Highlight usages in file

• Ctrl + W — Extend selection (selects a word->line->method->Class )
• Ctrl +Shift+ W — Decrease Selection
• Alt + J — Select next occurrence
• Ctrl + Alt + Shift + J — Select all occurrences
• Alt + Shift + J — Unselect occurrence
• Ctrl+Shift+V — Paste from recent buffers (from a History of Copied Contents)

• Ctrl+F6  — Refractor Code
• Ctrl+D — Duplicate a Line/Selected part
• Ctrl+Y — Delete a Line/Selected part
• Ctrl+Q — Quick Documentation
• Ctrl + Space — Code completion
• Ctrl+Shift+Space — Smart code completion (by expected type removes unrelated suggestions)
• Alt+Insert — Generate Code
• Ctrl+J — Insert Live template
• Ctrl + O — Override methods
• Ctrl + I — Implement methods
• Ctrl + Alt + T — Surround with…
• Ctrl + / — Comment / uncomment with line comment
• Ctrl + Shift + / — Comment / uncomment with block comment
• Ctrl+Alt+L — Reformat code

• Ctrl + F9 — Compile and Run Make a project
• Ctrl + Shift + F9 — Compile selected file, package or module
• Shift + F10 — Run
• Shift + F9 — Debug
• Ctrl + Shift + F10 — Run context configuration from editor

• F8 / F7 — Step over / into
• Shift + F7 / Shift + F8 — Smart step into/Step out
• Alt + F9 — Run to cursor
• Alt + F8 — Evaluate expression
• F9 — Resume program
• Ctrl + F8 — Toggle break point
• Ctrl + Shift + F8 — View breakpoints