Android Tutorials for Beginners

Monday, June 29, 2020

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Monday, May 18, 2020

What is GPS, How it works

GPS(Global Positioning System) is a satellite-based navigation system. It provides time and location-based information to a GPS receiver, located anywhere on or near the earth surface. GPS works in all weather conditions, provided there is an unobstructed line of sight communication with 4 or more GPS satellites. GPS is managed by the US Air Force

The Global Positioning System (GPS) is a network of about 30 satellites orbiting the Earth at an altitude of 20,000 km. The system was originally developed by the US government for military navigation but now anyone with a GPS device, be it a SatNav, mobile phone or handheld GPS unit, can receive the radio signals that the satellites broadcast.

Wherever you are on the planet, at least four GPS satellites are ‘visible’ at any time. Each one transmits information about its position and the current time at regular intervals. These signals, travelling at the speed of light, are intercepted by your GPS receiver, which calculates how far away each satellite is based on how long it took for the messages to arrive.

Any instant of time, there are at least 4 GPS satellites in line of sight to a receiver on the earth. Each of these GPS satellites sends information about its position and the current time to the GPS receiver at fixed regular instants of time. This information is transmitted to the receiver in the form of signal which is then intercepted by the receiver devices. These signals are radio signals that travel with the speed of light. The distance between a GPS receiver and the satellite is calculated by finding the difference between the time the signal was sent from GPS satellite and the time the GPS receiver received the signal.

Once the receiver receives the signal from at least three satellites, the receiver then points its location using trilateration process. A GPS requires at least 3 satellites to calculate 2-D position(latitude and longitude on a map). In this case, the GPS receiver assumes that it is located at mean sea level. However, it requires at least 4 satellites to find receivers 3-D position(latitude, longitude, and altitude).

Click to get Yor GPS Coordinates.

Sunday, May 17, 2020

How to check Radiation Level of Android Phone

What is SAR

Specific Absorption Rate (SAR) is a measure of the rate at which energy is absorbed per unit mass by a human body when exposed to a radio frequency (RF) electromagnetic field. It can also refer to absorption of other forms of energy by tissue, including ultrasound.[1]
It is defined as the power absorbed per mass of tissue and has units of watts per kilogram (W/kg).

All mobile phone models are tested to make sure they meet national and international exposure limits for exposure to radiofrequency emissions, before they can be sold in each market.

The SAR values reported for each model of mobile phone tend to significantly overstate real-life exposure levels, as models of phones are tested at maximum power levels under laboratory conditions to ensure that they comply.

Mobile phones tend not to operate at maximum power levels during everyday use.

In order to avoid network interference, improve battery life and available call time, mobile phones constantly adapt to the minimum power required to make and maintain a call.

How to check Radiation Level in Phone

Open Dialer and type *#07#

A dialog will open showing your Phone's SAR level

SAR Normal Value : 1.6 W/KG

If your phone's SAR is leass 1.6, it is good.

The lesser SAR, better for you.

New Advance Topics:                   Android LiveWallpaer Tutorial
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Android Gesture Detector         Handling/Detecting Swipe Events              Gradient Drawable
Detecting Missed Calls              Hide Title Bar                             GridView Animation
Android AlarmManager                 Android BootReceiver                   Vibrate Phone In a Desirable Pattern
Developing for Different Screen Sizes     Showing Toast for Longer Time       Publishing your App
How to publish Android App on Google Play
Android TextWatcher                               Android ExpandableListView
Android Image Slider Example
Android Custom GridView Example
Android MediaPlayer Example
Android Text To Speech Example
How to check Radiation Level of Android Phone
How to find Advertising ID of Android Phone
CountDownTimer in Android Example

Beginning With Android
Android : Introduction(What is Android)                                                Configuring Eclipse for Android Development
   Creating Your First Android Project                   Understanding Android Manifest File of your android app

Advance Android Topics                                                            Customizing Android Views

Customizing Toast In Android Customizing Radio Buttons

Showing Toast for Longer Time Customizing Checkboxes In Android

Customizing the Display Time of Toast Customizing ProgressBar

Using TimePickerDialog and DatePickerDialog In android Customizing Toast In Android

Animating A Button In Android

Populating ListView With DataBase Android Animation

Increasin Size of Checkboxes Using Android ImageSwitcher

Android ProgressBar Using Android TextSwitcher

Designing For Different Screen Sizes GridView Animation

Handling Keyboard Events Animating A Button In Android
Android ViewAnimator Example

Alarm Manager
Android AlarmManger
Scheduling Task Using AlarmManger

Working With Layouts                                                                Working With Views

Understanding Layouts in Android                                                   Using Buttons and EditText in Android
Working with Linear Layout (With Example)                                     Using CheckBoxes in Android
Nested Linear Layout (With Example)                                              Using AutoCompleteTextView in Android                                                                                          Grid View
Relative Layout In Android                                                               ListView
Table Layout                                                                                   Android ProgressBar
Frame Layout(With Example)                                                          Customizing ProgressBar
Absolute Layout                                                                             Customizing Radio Buttons
Grid Layout                                                                                    Customizing Checkboxes In
Android
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Deeveloping Simple Calculator App in Android

Android Advance Views
Android Spinner                                                                           Android GalleryView
Android TabWidget                                                                      Android ExpandableListView

Android Components                                                                 Dialogs In Android

Activity In Android                                                                    Working With Alert Dialog
Activity Life Cycle                                                                    Adding Radio Buttons In Dialog
Starting Activity For Result                                                     Adding Check Boxes In Dialog
Sending Data from One Activity to Other in Android                Creating Customized Dialogs in Android
Returning Result from Activity
PreferenceActivity In Android                                        Creating Dialog To Collect User Input
Android : Service                                                                     DatePicker and TimePickerDialog
BroadcastReceiver                                                                   Using TimePickerDialog and DatePickerDialog In android

Menus In Android                                                                ListView:
Creating Option Menu                                 Populating ListView With DataBase
Creating Context Menu In Android            Populating ListView with ArrayList
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Toast                                                                                      Working With SMS
Customizing Toast In Android                                               How to Send SMS in Android
Customizing the Display Time of Toast                                  How To Receive SMS
Customizing Toast At Runtime                                                Accessing Inbox In Android
Adding Image in Toast
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Using Telephony Manager In Android                                SharedPreferences In Android
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Miscellaneous
Notifications In Android
How To Vibrate The Android Phone
Sending Email In Android
Opening a webpage In Browser
How to Access PhoneBook In Android
Prompt User Input with an AlertDialog
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How to show an Activity in Landscape or Portrait Mode only.
How to Set an Image as Wallpaper.

Saturday, May 16, 2020

How to find Advertising ID of Android Phone

From Google Official Site : https://support.google.com/googleplay/android-developer/answer/6048248?hl=en

The advertising ID is a unique, user-resettable ID for advertising, provided by Google Play services. It gives users better controls and provides developers with a simple, standard system to continue to monetize their apps. It enables users to reset their identifier or opt out of personalized ads (formerly known as interest-based ads) within Google Play apps.

What is the need of Advertising ID

as of August 1st, 2014 Google has required all new app releases to utilize the Android Advertising Identifier.

Many Ad providers likeFacebook Aidience Netwrok require this advertising id to enter in order to ad a Testing Device.

How to find Advertising ID of Your Android Phone/Tablet

Step 1 : Open Settings

Step 2 : Click on Google/ Google Settings

You will see a list of options there

Step 3: Select "Ads"

Step 4 : At the bottom you will see Your Advertising ID which is a combination numbers, charatcters and hyphen(-).

Screnshots :

Customizing Toast In Android Customizing Radio Buttons

Showing Toast for Longer Time Customizing Checkboxes In Android

Customizing the Display Time of Toast Customizing ProgressBar

Using TimePickerDialog and DatePickerDialog In android Customizing Toast In Android

Animating A Button In Android

Populating ListView With DataBase Android Animation

Increasin Size of Checkboxes Using Android ImageSwitcher

Android ProgressBar Using Android TextSwitcher

Designing For Different Screen Sizes GridView Animation

Handling Keyboard Events Animating A Button In Android
Android ViewAnimator Example

Alarm Manager
Android AlarmManger
Scheduling Task Using AlarmManger

CountDownTimer in Android Example

What is a CountDownTimer ?

A CountDownTimer is a class in Android which enables us to do something at regular intervals.

There are 2 important methods on CountDownTimer Class

1: onTick(long) : in this method we write code to do something at regular intervals
2: onFinish() : code to execute when timer ends.

Example :

In our example, we assume that have given some task to user to finish in 10 seconds.

We will show count 1, 2, 3 ... and on till 10th seconds and show "Time Over" when 10 seconds ends.

Lets Start :

Create a new Project

activty_main.xml

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

<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"

 android:layout_width="fill_parent"

 android:layout_height="fill_parent"

 android:orientation="vertical" >


    <TextView

       android:id="@+id/textViewCounter"

       android:textSize="50dp"

       android:gravity="center"

       android:layout_width="match_parent"

       android:layout_height="match_parent"

       android:text="Time Starts" />

</LinearLayout>


MainActivity.java


import android.os.Bundle;
import android.os.CountDownTimer;
import android.support.v7.app.AppCompatActivity;
import android.widget.TextView;

public class MainActivity extends AppCompatActivity
{

    TextView textViewCounter;
    int counter = 0;
    CountDownTimer myTimer = new CountDownTimer(10000, 1000) {
        @Override       
        public void onTick(long l) {

            // set the counter and increase it by 1          
            textViewCounter.setText(""+counter);
            counter++;
        }

        @Override        
       public void onFinish() {

            textViewCounter.setText("Time Over");
        }
    };


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

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

        // start the timer       
         myTimer.start();

    }


}


Result :