Fused location provider api example

The best thing about Fused location provider API is that you not need to worry about location updates it gives you always latest and accurate location and updates location after a interval or on location change .
One more thing about Fused location provider API is you don't need to think about best location provider because it automatically choose best one suited for your hardware of  your android device.

Now Lets start with coding. like every post i am going to make a module of our all steps to complete code.

1. In this step we will create a new project in Android studio.
2. we will add Google Play service in our build.gradle.
3. In third step we will modify manifest file of our project to add location permission.
4. we will add two TextView to our activity_main.xml to show latitude and longitude.  
5. This will be our final step in this we will start and complete our MainAcitvity.java.

• So lets start with coding open your Android studio and go to File-->>New Project.

      
 select an Empty Activity and left everything as default.

• Open build.gradle(Module:app) from project explorer and add google play services to it. in simple copy below line of code and paste it under dependency of build.gradle(Module:app) like below image.

             compile 'com.google.android.gms:play-services:8.1.0' 

• Open manifest file and add location permission for  that you need to copy and  paste below code to your manifest file above <application tag like show in picture below.

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

•  you need to add one more line to manifest but this will be inside <application> so just copy and   paste below code to manifest.this is version number of your gms.

<meta-data android:name="com.google.android.gms.version" android:value="@integer/google_play_services_version" />

     Now here my manifest looks like below image.

• Now open your activity_main.xml and add two TextView like below code.

<?xml version="1.0" encoding="utf-8"?>
<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:paddingBottom="@dimen/activity_vertical_margin"
    android:paddingLeft="@dimen/activity_horizontal_margin"
    android:paddingRight="@dimen/activity_horizontal_margin"
    android:paddingTop="@dimen/activity_vertical_margin"
    tools:context=".MainActivity">

    <TextView
        android:id="@+id/textView"
        android:layout_margin="20dp"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="Latitude"
        android:layout_centerVertical="true"
        android:layout_centerHorizontal="true" />

    <TextView
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="Longitude"
        android:id="@+id/textView2"
        android:layout_above="@+id/textView"
        android:layout_centerHorizontal="true" />


</RelativeLayout>

• Now open your MainActivity.java here we will implement three interface 

1. ConnectionCallbacks
2. OnConnectionFailedListener
3. LocationListener

public class MainActivity extends AppCompatActivity implements GoogleApiClient.ConnectionCallbacks,
        GoogleApiClient.OnConnectionFailedListener, LocationListener{

• After implement of these three interface android studio will show you an error click on error and click on implement methods.this will implement four method to your class like below code.

 

@Override
    public void onConnected(Bundle bundle) {
        
    }

    @Override
    public void onConnectionSuspended(int i) {

    }

    @Override
    public void onLocationChanged(Location location) {

    }

    @Override
    public void onConnectionFailed(ConnectionResult connectionResult) {

    }

• Now i am going to add two TextView, GoogleApiClient, LocationRequest, Location and two string varriable to our MainActivity.java class like below code. just copy and paste these codes above your onCreate() method.

    TextView txtOutputLat, txtOutputLon;
    Location mLastLocation;
    private GoogleApiClient mGoogleApiClient;
    private LocationRequest mLocationRequest;
    String lat,lon;

• Now we will make a method to build GoogleApiClient , name of method will be buildGoogleApiClient(). in this method we will build GoogleApiClient and will add these to GoogleApiClient . 

• OnConnectionFailedListener
• Api(LocationServices.API)
• ConnectionCallbacks

      Here is my snippet of  buildGoogleApiClient().

synchronized void buildGoogleApiClient() {
        mGoogleApiClient = new GoogleApiClient.Builder(this)
                .addConnectionCallbacks(this)
                .addOnConnectionFailedListener(this)
                .addApi(LocationServices.API)
                .build();


    }

• we also need to override onStart() and onDestroy() method of activity. in onStart() method we will connect GoogleApiClient and in onDestroy() we will disconnect it like below code.

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

    @Override
    protected void onDestroy() {
        super.onDestroy();
        mGoogleApiClient.disconnect();
    }

• Now inside onConnected() we will create object of  LocationRequest, add priority of  accuracy  and will set interval to get location update and after that will make a request to get  last Location like below code. just copy and paste this code inside onConnected() method.in my code i am setting accuracy to High and interval is 10 second.

 mLocationRequest = LocationRequest.create();
        mLocationRequest.setPriority(LocationRequest.PRIORITY_HIGH_ACCURACY);
        mLocationRequest.setInterval(10000); // Update location every second

        LocationServices.FusedLocationApi.requestLocationUpdates(mGoogleApiClient, mLocationRequest, this);


        mLastLocation = LocationServices.FusedLocationApi.getLastLocation(
                mGoogleApiClient);
        if (mLastLocation != null) {
            lat = String.valueOf(mLastLocation.getLatitude());
            lon = String.valueOf(mLastLocation.getLongitude());

        }

• Everything is set now we are going to complete  last few step. I am going to make a method called updateUI()and in this method i will set value of latitude and longitude to  TextView and make a call of this updateUI()method in onConnected() and onLocationChange(). here is updateUI() method.

void updateUI() {
        txtOutputLat.setText(lat);
        txtOutputLon.setText(lon);
    }

• we have finished all the step here is my complete MainActivity.java class.

import android.location.Location;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.util.Log;
import android.view.View;
import android.widget.Button;
import android.widget.TextView;

import com.google.android.gms.common.ConnectionResult;
import com.google.android.gms.common.api.GoogleApiClient;
import com.google.android.gms.location.LocationListener;
import com.google.android.gms.location.LocationRequest;
import com.google.android.gms.location.LocationServices;

public class MainActivity extends AppCompatActivity implements GoogleApiClient.ConnectionCallbacks,
        GoogleApiClient.OnConnectionFailedListener, LocationListener {


    TextView txtOutputLat, txtOutputLon;
    Location mLastLocation;
    private GoogleApiClient mGoogleApiClient;
    private LocationRequest mLocationRequest;
    String lat, lon;


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


        txtOutputLat = (TextView) findViewById(R.id.textView);
        txtOutputLon = (TextView) findViewById(R.id.textView2);


        buildGoogleApiClient();
    }


    @Override
    public void onConnected(Bundle bundle) {


        mLocationRequest = LocationRequest.create();
        mLocationRequest.setPriority(LocationRequest.PRIORITY_HIGH_ACCURACY);
        mLocationRequest.setInterval(100); // Update location every second

        LocationServices.FusedLocationApi.requestLocationUpdates(mGoogleApiClient, mLocationRequest, this);


        mLastLocation = LocationServices.FusedLocationApi.getLastLocation(
                mGoogleApiClient);
        if (mLastLocation != null) {
            lat = String.valueOf(mLastLocation.getLatitude());
            lon = String.valueOf(mLastLocation.getLongitude());

        }
        updateUI();
    }

    @Override
    public void onConnectionSuspended(int i) {

    }

    @Override
    public void onLocationChanged(Location location) {
        lat = String.valueOf(location.getLatitude());
        lon = String.valueOf(location.getLongitude());
        updateUI();
    }

    @Override
    public void onConnectionFailed(ConnectionResult connectionResult) {
        buildGoogleApiClient();
    }

    synchronized void buildGoogleApiClient() {
        mGoogleApiClient = new GoogleApiClient.Builder(this)
                .addConnectionCallbacks(this)
                .addOnConnectionFailedListener(this)
                .addApi(LocationServices.API)
                .build();


    }

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

    @Override
    protected void onDestroy() {
        super.onDestroy();
        mGoogleApiClient.disconnect();
    }

    void updateUI() {
        txtOutputLat.setText(lat);
        txtOutputLon.setText(lon);
    }
}

Error:java.lang.OutOfMemoryError: GC overhead limit exceeded :app:transformClassesWithDexForRelease FAILED

Error:java.lang.OutOfMemoryError: GC overhead limit exceeded :app:transformClassesWithDexForRelease FAILED

-

Add this to your android closure in your build.gradle file:

dexOptions {
    javaMaxHeapSize "4g"
}

Network topology-

http://www.studytonight.com/computer-networks/network-topology-types

Get Asynctask response using interface callback in activity and fragment

Asynctask-

public class ConfirmKitAsync extends AsyncTask<String,String,String > {

    static MediaType JSON = MediaType.parse("application/json; charset=utf-8");
    String url;
    RestUserId restUserId;
    ProgressDialog progressDialog;
    IConfirmKitListener responseListener;
    Context context;
    //   String path = null;
    public interface IConfirmKitListener {
        public void callbackConfirmKit(String response);
    }
    public void setConfirmKitListener (IConfirmKitListener listener){
        this.responseListener = listener;
    }

    public ConfirmKitAsync(Context context, String url, RestUserId restUserId) {

        this.context = context;
        this.url = url;
        this.restUserId = restUserId;
   //   path = Uri.parse(url).getPath();   

   //   responseListener = (IConfirmKitListener) context;    

    }

    @Override    

    protected void onPreExecute() {
        super.onPreExecute();
        progressDialog = new ProgressDialog(context);
        progressDialog.setMessage("Loading...");
        progressDialog.setCanceledOnTouchOutside(false);
        progressDialog.setCancelable(false);
        progressDialog.show();
    }

    @Override    

    protected String doInBackground(String... strings) {
        String responseString = null;
        if (isCancelled()) {
            return null;
        } else {
            try {
                Request.Builder builder = new Request.Builder().url(url);
                RequestBody body = RequestBody.create(JSON,
                        new Gson().toJson(restUserId));

                builder.post(body);
                OkHttpClient client = CommonTask.getCommonOkHttpCient();
                client.setConnectTimeout(2, TimeUnit.MINUTES);
                client.setReadTimeout(5, TimeUnit.MINUTES);
                Response response = client.newCall(builder.build()).execute();
                responseString = response.body().string();

                return responseString;
            } catch (SocketTimeoutException e) {

            } catch (Exception e) {
                e.printStackTrace();
            }
        }
        return responseString;
    }

    @Override    

    protected void onPostExecute(String result) {
        if (result != null) {
            super.onPostExecute(result);
            try {
                responseListener.callbackConfirmKit(result);
            } catch (Exception e) {
                e.printStackTrace();
            }
        }
        if (progressDialog != null && progressDialog.isShowing()) {
            progressDialog.dismiss();
        }
    }
}

for Activity-

ConfirmKitAsync async= new ConfirmKitAsync (context,  url, restUserId);
async.execute();

for Fragment-

ConfirmKitAsync async= new ConfirmKitAsync(context,  uri, restUserId);
async.setConfirmKitListener(this);
async.execute();

Callback-

@Override
public void callbackConfirmKit(String jsonStr) {
    try {
        if (jsonStr != null && jsonStr.length() > 0) {

            JSONObject jsonObj = new JSONObject(jsonStr);
            JSONObject jObj = jsonObj.getJSONObject("Data");
            jsonArray = jObj.getJSONArray("RestWeapon");

            for (int i = 0; i < jsonArray.length(); i++) {
           }
         }
        }
    catch (JSONException e){
     e.getMessage();
    }
}

Shared Preference implementation

We can save user information local to the application using shared preferences.  This information persist till the application is install in your device. 

public class MySharedPreference {

    private static MySharedPreference mInstance=null;

    private static final String PREFS_NAME = "MY_PREFS";

    private static String PREFS_USER_KEY = "PREFS_USER_NAME";

    SharedPreferences mSharedPreferences=null;

    SharedPreferences.Editor editor=null;

    public MySharedPreference(Context context) {

        this.mSharedPreferences = context.getSharedPreferences(PREFS_NAME, Context.MODE_PRIVATE);

        this.editor = mSharedPreferences.edit();

    }

    public static MySharedPreference getInstance(Context context){

        if(context!=null) {

            if (mInstance == null) {

                mInstance = new MySharedPreference(context);

            }

        }

        return mInstance;

    }

    public String getUserSharedPref() {

        return this.mSharedPreferences.getString(PREFS_USER_KEY,null);

    }

    public void setUserSharedPref(String userName) {

        editor.putString(PREFS_USER_KEY, userName);

        editor.commit();

    }

}

//******************************************************************//

Save your preferences-

MySharedPreference mPref= MySharedPreference.getInstance(context);

mPref.setUserSharedPref(userName.getText().toString());

//*****************************************************************//

Get Preference Value-

String str= MySharedPreference.getInstance(context).getUserSharedPref();

Make edit text not editable but clickable programmatically

apply -
     editText.setFocusable(false);
     editText.setClickable(true);

but if you want to edit text not editable and not clickable then apply
    editText.setEnable(false);

Create custom actionBar

 android:textColorHint="@color/hint_color"
 android:background="@android:color/transparent"

To do so, follow those 2 simple steps:

1. Java Code

getSupportActionBar().setDisplayOptions(ActionBar.DISPLAY_SHOW_CUSTOM);
getSupportActionBar().setCustomView(R.layout.actionbar);
Where R.layout.actionbar is the following XML.

2. XML

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="match_parent"
    android:layout_height="wrap_content"
    android:layout_gravity="center"
    android:orientation="vertical">

<TextView
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:layout_gravity="center"
    android:text="YOUR ACTIVITY TITLE"
    android:textColor="#ffffff"
    android:textSize="24sp" />
</LinearLayout>

Most asked interview programs

Program 1-    Upcasting and Downcasting

package com.sanjay.java.basic;

class Parent {

/*Parent() {
System.out.println("Parent constructor.");
}*/

public void show() {
System.out.println("I am Parent class method.");
}

}

public class Child extends Parent {
/*
Child() {
System.out.println("Child constructor.");
}*/

public void show() {
System.out.println("I am Child class method.");
}

static void check(Parent p) {

Child t = (Child) p;
t.show();
System.out.println("Down casting done");
}

/**
* @param args
*/
public static void main(String[] args) {
// TODO Auto-generated method stub
System.out.println("*********Down casting*************");
// CastingTest test=(CastingTest) new Parent(); //Exception in thread
// "main" java.lang.ClassCastException: at run time
Parent b = new Child();
Child.check(b);

System.out.println("*********up casting*************");
Parent obj = new Child();
obj.show();

}

}

Output-

*********Down casting*************
I am Child class method.
Down casting done
*********up casting*************
I am Child class method.

Program 2-  Reverse Sentence

package com.sanjay.java.basic;

public class ReverseSentence {

public String doReverse(String str) {

String revStr = "";

String sp[] = str.split(" ");

for (int i = sp.length - 1; i >= 0; i--) {

revStr = revStr + sp[i]+" ";

}

return revStr;

}

public static void main(String arg[]) {

String str = "I live in delhi";

ReverseSentence obj = new ReverseSentence();

String reverse=obj.doReverse(str);

System.out.println("Reverse sentence = " + reverse);

}

}

Output-  

Reverse sentence = delhi in live I 

Program 3-      Reverse String

package com.sanjay.java.basic;

public class ReverseString {

/**

* @param args

*/

public static void main(String[] args) {

// TODO Auto-generated method stub

String str="My Name is sanjay verma";

String rev="";

for(int i=str.length()-1;i>=0;i--){

rev=rev+str.charAt(i);

}

System.out.println(rev);

}

}

Output-

amrev yajnas si emaN yM

Program- 4  Comosition Uses [ Using composition achieve inheritance ]

package com.sanjay.java.basic;

class Test {

public void name() {

System.out.println("I am android profesional.");

}

}

final class MyComposition {

public void show() {

System.out.println("I am Composition method.");

}

}

public class CompositionTest extends Test {

MyComposition composition;

public void display() {

composition = new MyComposition();

composition.show();

}

/**

* @param args

*/

public static void main(String[] args) {

// TODO Auto-generated method stub

CompositionTest obj = new CompositionTest();

obj.display();

obj.name();

}

}

Output-

I am Composition method.

I am android profesional.

Program 5-  Prime Number check

package com.sanjay.java.basic;

public class PrimeNumber {

public void checkPrime(int num) {

int j = 2;

// for (int i = 0; i <= num; i++) {

// while(num<=500){

while (j < num) {

if (num % j == 0) {

break;

} else {

j++;

}

}

// }

if (num == j) {

System.out.println("Prime number -" + num);

} else {

System.out.println("Number is not prime");

}

// }

}

/**

* @param args

*/

public static void main(String[] args) {

// TODO Auto-generated method stub

PrimeNumber obj = new PrimeNumber();

obj.checkPrime(23);

}

}

Output-

Prime number -23

Program- 6  Palindrome Check

package com.sanjay.java.basic;

public class PalindromeChek {
// static String mString = "madam";

private boolean isPalindrome(String str) {

int i = str.length() - 1;
int j = 0;

while (i > j) {

if (str.charAt(i) != str.charAt(j)) {
return false;
}
i--;
j++;

}
return true;

}

private void integerValueCheck(int n) {
int r, temp, sum = 0;

// int n = 454;

temp = n;

while (n > 0) {

r = n % 10;
sum = (sum * 10) + r;
n = n / 10;

}
if (sum == temp) {
System.out.println("Number is palindrome");
} else {
System.out.println("Number not palindrome");
}
}

/**
* @param args
*/
public static void main(String[] args) {
// TODO Auto-generated method stub
// ********************* STRING CHECK********************************
PalindromeChek obj = new PalindromeChek();
boolean b = obj.isPalindrome("aman");

//System.out.println("string check " + b);
if (b) {
System.out.println("String is palindrome");
} else {
System.out.println("String not palindrome");
}
// **********************INTEGER CHECK*******************************

obj.integerValueCheck(425124);

}

}

Output-
String is palindrome
Number is palindrome

Program -7  (Armstrong number check)

package com.sanjay.java;

public class ArmStrongNumber {

void getArmStrong(int num) {
int n, sum = 0;
int rem, cube;
n = num;
while (n > 0) {
rem = n % 10;
cube = rem * rem * rem;
sum = sum + cube;
n = n / 10;
}
if (sum == num) {
System.out.println("Armstrong number =" + sum);
}else{
System.out.println("Number not an ArmStrong");
}
}

public static void main(String[] args) {
// TODO Auto-generated method stub
ArmStrongNumber obj = new ArmStrongNumber();
obj.getArmStrong(153);
                obj.getArmStrong(155);
}


}

Output-

Armstrong number =153

Number not an ArmStrong

Program -8  (One interface can extends more than one interface)

package com.sanjay.java;

interface printable{

void print();

}

interface scannable  {

void scan();

}

interface functional extends scannable , printable{

void work();

}

class A6 implements functional {

public void print(){System.out.println("print");}

public void scan(){System.out.println("scan");}

public void work(){System.out.println("work");}

public static void main(String args[]){

A6 obj = new A6();

obj.print();

obj.scan();

obj.work();

 }

}

Output-
    print
   scan
   work

Program -9  (Count number occurrence in array)

public class NumberOccurrance {

 public static void main(String[] args) {

  // TODO Auto-generated method stub

       int[] arr={2,3,4,2,5,6,2,1,3,2,8,9};

       int[] solArr=new int[12];



/**

*  Here i am creating solArr with 12 length, it initialized all index with 0 value.

*            ___________________________________________________

*            |_0_|_1_|_2_|_3_|_4_|_5_|_6_|_7_|_8_|_9_|_10_|_11_|

      arr[i]=  2   3   4   2   5   6   2   1   3   2   8     9

   

      solArr[arr[i]]= 

                  solArr[arr[0]]=> solArr[2]=1

                  solArr[arr[1]]=> solArr[3]=1

                  solArr[arr[2]]=> solArr[4]=1

                  solArr[arr[3]]=> solArr[2]=1+1 = 2

                  solArr[arr[4]]=> solArr[5]=1

                  solArr[arr[5]]=> solArr[6]=1

                  solArr[arr[6]]=> solArr[2]=2+1 = 3

                  solArr[arr[7]]=> solArr[1]=1

                  solArr[arr[8]]=> solArr[3]=1+1 = 2

                  solArr[arr[9]]=> solArr[2]=3+1 = 4

                  .

                  .

                  So if same number is already in solArr index then increment by 1 in below code.

*/

       for(int i=0;i<arr.length;i++){

        solArr[arr[i]]+=1;

       }
System.out.println("Array elements and it's count");

           for (int j = 0; j < solArr.length; j++) {

               System.out.println("element "+j +" count "+solArr[j]);

     }

       if(solArr[2]>=solArr[3]){

             System.out.println(2);

       }else{

             System.out.println(1);

       }

}

}

Output-

index 0  count 0

index 1  count 1

index 2  count 4

index 3  count 2

index 4  count 1

index 5  count 1

index 6  count 1

index 7  count 0

index 8  count 1

index 9  count 1

index 10  count 0

index 11  count 0

2