Android App Development for Phones/Tablets: android

Showing posts with label android. Show all posts

Thursday, 30 May 2019

Flutter GPS Location

In this tutorial , we try to fetch phone GPS Location.

I used this library in pubspec.yaml file under dependencies

dependencies:
  location: ^2.3.5


Android #

In order to use this plugin in Android, you have to add this permission in AndroidManifest.xml :
<uses-permission android:name="android.permission.ACCESS_FINE_LOCATION" />


Permission check for Android 6+ was added.

iOS #

And to use it in iOS, you have to add this permission in Info.plist :
NSLocationWhenInUseUsageDescription
NSLocationAlwaysUsageDescription


Warning: there is a currently a bug in iOS simulator in which you have to manually select a Location several in order for the Simulator to actually send data. Please keep that in mind when testing in iOS simulator.

main.dart

import 'package:flutter/material.dart';
import 'package:flutter_app_sample/GetLocationPage.dart';



void main() => runApp(MyApp());

class MyApp extends StatelessWidget {
  // This widget is the root of your application.
  @override
  Widget build(BuildContext context) {
    return MaterialApp(
      title: 'Flutter GPS',
      theme: ThemeData(
        primarySwatch: Colors.blue,
      ),
      home: GetLocationPage(),
    );
  }
}

GetLocationPage.dart

import 'package:flutter/material.dart';
import 'package:location/location.dart';

class GetLocationPage extends StatefulWidget {
  @override
  _GetLocationPageState createState() => _GetLocationPageState();
}

class _GetLocationPageState extends State<GetLocationPage> {
  LocationData _currentLocation;
  Location _locationService = new Location();

  @override
  void initState() {
    // TODO: implement initState
    super.initState();

    _getLocation().then((value) {
      setState(() {
        _currentLocation = value;
      });
    });
  }

  @override
  Widget build(BuildContext context) {
    return Scaffold(
      appBar: AppBar(),
      body: Center(
        child: Column(
          mainAxisAlignment: MainAxisAlignment.center,
          children: <Widget>[
            _currentLocation == null
                ? CircularProgressIndicator()
                : Text("Location:" +
                    _currentLocation.latitude.toString() +
                    " " +
                    _currentLocation.longitude.toString()),
            Padding(
              padding: const EdgeInsets.all(8.0),
              child: RaisedButton(
                onPressed: () {
                  _getLocation().then((value) {
                    setState(() {
                      _currentLocation = value;
                    });
                  });
                },
                color: Colors.blue,
                child: Text(
                  "Get Location",
                  style: TextStyle(color: Colors.white),
                ),
              ),
            ),
          ],
        ),
      ),
    );
  }

  Future<LocationData> _getLocation() async {
    LocationData currentLocation;
    try {
      currentLocation = await _locationService.getLocation();
    } catch (e) {
      currentLocation = null;
    }
    return currentLocation;
  }
}

Friday, 16 December 2016

BottomSlider like Uber

I really like uber's Bottom Slider a lot and i want to create a view like that.After searching, I found a great library do it easily. Here is the screenshot of the sample.

Step: 1
======

Add below line to build.gradle file under app folder and sync

compile 'com.github.lawloretienne:discreteslider:0.0.9'

Credits to the Author of the Library.
Etienne Lawlor
Github Link

Step: 2
======
create a layout like below

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"
    android:id="@+id/main_content"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:orientation="vertical">

    <FrameLayout
        android:id="@+id/container"
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        android:layout_weight="1"
        android:background="@color/grey_500"
        android:orientation="vertical">

    </FrameLayout>

    <LinearLayout
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:layout_gravity="bottom"
        android:background="@color/grey_100"
        android:orientation="vertical">

        <RelativeLayout
            android:id="@+id/tick_mark_labels_rl"
            android:layout_width="match_parent"
            android:layout_height="wrap_content"
            android:paddingTop="8dp" />

        <com.etiennelawlor.discreteslider.library.ui.DiscreteSlider
            android:id="@+id/discrete_slider"
            android:layout_width="match_parent"
            android:layout_height="56dp"
            android:layout_marginBottom="4dp"
            android:background="@color/grey_100"
            android:paddingLeft="8dp"
            android:paddingRight="8dp"
            app:backdropFillColor="@color/grey_200"
            app:backdropStrokeColor="@color/grey_300"
            app:backdropStrokeWidth="1dp"
            app:horizontalBarThickness="4dp"
            app:position="0"
            app:progressDrawable="@drawable/transparent_progress_drawable"
            app:tickMarkCount="4"

            app:tickMarkRadius="8dp" />

    </LinearLayout>

</LinearLayout>

Step: 3
======
create a drawable with an image like below. I have created four files like this. please see source code for reference.

ubergo.xml
=========

<?xml version="1.0" encoding="utf-8"?>
<layer-list xmlns:android="http://schemas.android.com/apk/res/android">

    <item>

        <shape xmlns:android="http://schemas.android.com/apk/res/android"
            android:shape="oval">

            <size
                android:width="40dp"
                android:height="40dp" />
            <stroke
                android:width="8dp"
                android:color="@color/fifty_percent_transparency_primary" />

            <solid android:color="@color/colorPrimary" />

            <corners android:radius="1dp" />

        </shape>
    </item>

    <item>

        <bitmap
            android:gravity="center"
            android:src="@drawable/ic_directions_car_black_24dp" />
    </item>


</layer-list>

Add all icons are added as an array in strings.xml file and we can use in MainActivity class.

<array name="icons">
    <item>@drawable/uber_pool</item>
    <item>@drawable/uber_moto</item>
    <item>@drawable/uber_go</item>
    <item>@drawable/uber_suv</item>
</array>

Step: 4
======
Create an Activity class and

MainActivity.java
==============

package com.pratap.discreteslider;

import android.content.res.Resources;
import android.content.res.TypedArray;
import android.os.Bundle;
import android.support.v4.content.ContextCompat;
import android.support.v7.app.AppCompatActivity;
import android.view.Gravity;
import android.view.ViewTreeObserver;
import android.widget.RelativeLayout;
import android.widget.TextView;
import android.widget.Toast;

import com.etiennelawlor.discreteslider.library.ui.DiscreteSlider;
import com.etiennelawlor.discreteslider.library.utilities.DisplayUtility;

public class MainActivity extends AppCompatActivity {


    DiscreteSlider discreteSlider;
    RelativeLayout tickMarkLabelsRelativeLayout;

    TypedArray icons;
    String[] tickMarkLabels = {"POOL", "uberMOTO", "uberGo", "uberSUV"};

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        tickMarkLabelsRelativeLayout = (RelativeLayout) findViewById(R.id.tick_mark_labels_rl);
        discreteSlider = (DiscreteSlider) findViewById(R.id.discrete_slider);

        Resources res = getResources();
        icons = res.obtainTypedArray(R.array.icons);

        // Detect when slider position changes
        discreteSlider.setOnDiscreteSliderChangeListener(new DiscreteSlider.OnDiscreteSliderChangeListener() {
            @Override
            public void onPositionChanged(int position) {
                int childCount = tickMarkLabelsRelativeLayout.getChildCount();
                for (int i = 0; i < childCount; i++) {
                    TextView tv = (TextView) tickMarkLabelsRelativeLayout.getChildAt(i);
                    if (i == position) {
                        tv.setTextColor(ContextCompat.getColor(MainActivity.this, R.color.colorPrimary));
                        discreteSlider.setThumb(icons.getDrawable(position));

                        // show selected item
                        Toast toast = Toast.makeText(MainActivity.this, tickMarkLabels[i], Toast.LENGTH_SHORT);
                        toast.setGravity(Gravity.CENTER, 0, 0);
                        toast.show();
                    } else
                        tv.setTextColor(ContextCompat.getColor(MainActivity.this, R.color.grey_700));


                }


            }
        });

        tickMarkLabelsRelativeLayout.getViewTreeObserver().addOnGlobalLayoutListener(new ViewTreeObserver.OnGlobalLayoutListener() {
            @Override
            public void onGlobalLayout() {
                tickMarkLabelsRelativeLayout.getViewTreeObserver().removeGlobalOnLayoutListener(this);

                addTickMarkTextLabels();
            }
        });


    }


    private void addTickMarkTextLabels() {
        int tickMarkCount = discreteSlider.getTickMarkCount();
        float tickMarkRadius = discreteSlider.getTickMarkRadius();
        int width = tickMarkLabelsRelativeLayout.getMeasuredWidth();

        int discreteSliderBackdropLeftMargin = DisplayUtility.dp2px(this, 32);
        int discreteSliderBackdropRightMargin = DisplayUtility.dp2px(this, 32);
        float firstTickMarkRadius = tickMarkRadius;
        float lastTickMarkRadius = tickMarkRadius;
        int interval = (width - (discreteSliderBackdropLeftMargin + discreteSliderBackdropRightMargin) - ((int) (firstTickMarkRadius + lastTickMarkRadius)))
                / (tickMarkCount - 1);

        int tickMarkLabelWidth = DisplayUtility.dp2px(this, 40);

        for (int i = 0; i < tickMarkCount; i++) {
            TextView tv = new TextView(this);

            RelativeLayout.LayoutParams layoutParams = new RelativeLayout.LayoutParams(
                    RelativeLayout.LayoutParams.WRAP_CONTENT, RelativeLayout.LayoutParams.WRAP_CONTENT);

            tv.setText(tickMarkLabels[i]);
            tv.setGravity(Gravity.CENTER);


            if (i == discreteSlider.getPosition()) {
                tv.setTextColor(ContextCompat.getColor(MainActivity.this, R.color.colorPrimary));
                discreteSlider.setThumb(icons.getDrawable(i));

            } else
                tv.setTextColor(ContextCompat.getColor(MainActivity.this, R.color.grey_700));

            //  tv.setBackgroundColor(getResources().getColor(android.R.color.holo_blue_dark));

            int left = discreteSliderBackdropLeftMargin + (int) firstTickMarkRadius + (i * interval) - (tickMarkLabelWidth / 2);

            layoutParams.setMargins(left,
                    0,
                    0,
                    0);
            tv.setLayoutParams(layoutParams);

            tickMarkLabelsRelativeLayout.addView(tv);
        }
    }

}

Source Code
==========
Link

ScreenShots
==========

Friday, 27 November 2015

Android HttpURLConnection code for GET and POST Methods

package com.infodat.selltis2;

import android.util.Log;

import com.infodat.selltis2.utils.Constants;
import com.infodat.selltis2.utils.Utils;

import java.io.BufferedInputStream;
import java.io.BufferedReader;
import java.io.BufferedWriter;
import java.io.IOException;
import java.io.InputStream;
import java.io.InputStreamReader;
import java.io.OutputStream;
import java.io.OutputStreamWriter;
import java.io.UnsupportedEncodingException;
import java.net.HttpURLConnection;
import java.net.URL;
import java.net.URLEncoder;
import java.util.HashMap;
import java.util.Map;

import javax.net.ssl.HttpsURLConnection;

public class HttpWebServiceHandlerSample {

    static String response = null;


    public HttpWebServiceHandlerSample() {

    }


    /**
     * Making service call
     *
     * @url - url to make request
     * @method - http request method
     * @params - http request params
     */


    // Get Request using HttpURLConnection  Code
    public String makeGetServiceCall(String requestURL, HashMap<String, String> postDataParams) {

        InputStream inputStream = null;

        HttpURLConnection conn = null;

        String response = "";
        try {
                /* forming th java.net.URL object */


            String newRequestURL = requestURL + getQueryString(postDataParams);

            URL url = new URL(newRequestURL);
            Log.i("URL ", newRequestURL);

            conn = (HttpURLConnection) url.openConnection();

                 /* optional request header */
            conn.setRequestProperty("Content-Type", "application/json");

                /* optional request header */
            conn.setRequestProperty("Accept", "application/json");

            //  urlConnection.setConnectTimeout(100000);

                /* for Get request */
            conn.setRequestMethod("GET");

            int statusCode = conn.getResponseCode();

                /* 200 represents HTTP OK */
            if (statusCode == 200) {

                inputStream = new BufferedInputStream(conn.getInputStream());

                response = convertInputStreamToString(inputStream);


            } else {
                response = Constants.NetWorkErrorMSG;
            }

        } catch (Exception e) {
            //    Log.i("Selltis N/w Error", e.getLocalizedMessage());
            response = Constants.NetWorkErrorMSG;

        } finally {

            if (conn != null)
                conn.disconnect();
        }

        Log.i("RESPONSE", response);
        return response; // return response

    }


    // Convert all key/Value pairs to URL request parameters
    private String getQueryString(HashMap<String, String> params) throws UnsupportedEncodingException {
        StringBuilder result = new StringBuilder();
        boolean first = true;
        for (Map.Entry<String, String> entry : params.entrySet()) {
            if (first)
                first = false;
            else
                result.append("&");

            result.append(URLEncoder.encode(entry.getKey(), "UTF-8"));
            result.append("=");
            result.append(URLEncoder.encode(entry.getValue(), "UTF-8"));
        }

        return result.toString();
    }


    // convert InputStream to String
    private String convertInputStreamToString(InputStream inputStream) throws IOException {

        BufferedReader bufferedReader = new BufferedReader(new InputStreamReader(inputStream));

        String line = "";
        String result = "";

        while ((line = bufferedReader.readLine()) != null) {
            result += line;
        }

            /* Close Stream */
        if (null != inputStream) {
            inputStream.close();
        }

        return result;
    }


    // POST Request using HttpURLConnection  Code
    public String makePostServiceCall(String requestURL, String postJosnData) {
        InputStream inputStream = null;
        URL url;
        String response = "";
        HttpURLConnection conn = null;
        try {
            url = new URL(requestURL);

            conn = (HttpURLConnection) url.openConnection();
            conn.setReadTimeout(10000);
            conn.setConnectTimeout(10000);
            conn.setRequestMethod("POST");
            conn.setDoInput(true);
            conn.setDoOutput(true);

                 /* optional request header */
            conn.setRequestProperty("Content-Type", "application/json");

                /* optional request header */
            conn.setRequestProperty("Accept", "application/json");

            OutputStream os = conn.getOutputStream();
            BufferedWriter writer = new BufferedWriter(
                    new OutputStreamWriter(os, "UTF-8"));
            writer.write(postJosnData);

            //    Log.i("POST URL", url.toString());
            //   Log.i("POST DATA", postJosnData);

            writer.flush();
            writer.close();
            os.close();
            int responseCode = conn.getResponseCode();

            if (responseCode == HttpURLConnection.HTTP_OK) {

                inputStream = new BufferedInputStream(conn.getInputStream());

                response = convertInputStreamToString(inputStream);


            } else {
                response = Utils.ServerErrorMessage;

            }
        } catch (Exception e) {

            //   Log.i("Selltis N/w Error", e.getLocalizedMessage());
            response = Utils.ServerErrorMessage;
        } finally {

            if (conn != null)
                conn.disconnect();
        }

        return response;

    }


}

Wednesday, 10 June 2015

Create Form Programmatically in Android

Step: 1

create a new xml layout with scrollview and LinearLayout . We create child view dynamically through code , added to the LinearLayout.

<?xml version="1.0" encoding="utf-8"?>
<ScrollView xmlns:android="http://schemas.android.com/apk/res/android"
    android:id="@+id/scrollView"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:fillViewport="false"
    android:scrollbars="none"
    android:layout_margin="16dp">

    <LinearLayout
        android:id="@+id/layout1"
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        android:orientation="vertical"
        ></LinearLayout>

</ScrollView>

Step: 2

create new Activity class

package com.pratap.dynamicforms;

import android.os.Bundle;
import android.support.v7.app.AppCompatActivity;
import android.util.Log;
import android.view.View;
import android.widget.ArrayAdapter;
import android.widget.Button;
import android.widget.CheckBox;
import android.widget.EditText;
import android.widget.LinearLayout;
import android.widget.Spinner;

import java.util.ArrayList;
import java.util.List;

import static android.view.ViewGroup.LayoutParams.WRAP_CONTENT;

/**
 * Created by pratap.kesaboyina on 10-06-2015.
 */
public class DynamicForm extends AppCompatActivity {


    LinearLayout layout1;
    private static int viewsCount = 0;
    private List<View> allViews = new ArrayList<View>();
    LinearLayout.LayoutParams params;
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);

        setContentView(R.layout.dynamic_form);

        // To set Margin for the child Views
       params = new LinearLayout.LayoutParams(
                LinearLayout.LayoutParams.MATCH_PARENT, LinearLayout.LayoutParams.WRAP_CONTENT);

        params.setMargins(5, 5, 5, 5);

        // LinearLayout acts as parent Layout , we will add child Views to this Layout dynamically
        layout1 = (LinearLayout) findViewById(R.id.layout1);
        // Sample Data for Spinner
        ArrayList<String> spinnerList = new ArrayList<String>();
        spinnerList.add("Select");
        spinnerList.add("Hyderabad");
        spinnerList.add("Banglore");
        spinnerList.add("Chennai");
        spinnerList.add("Delhi");
        spinnerList.add("Mumbai");

// create edittext dynamically , added to LinearLayout
        createEditText("First Name");
        createEditText("Last Name");
        createEditText("Age");
        createEditText("Address");
        createSpinner(spinnerList);
        createEditText("State");


// create spinners dynamically , added to LinearLayout


// create checkbox dynamically , added to LinearLayout
        createCheckBox("Key Contact");
        createCheckBox("Target contact");
        saveButton();

    }

// create a button to show/save data , entered in the Form
    private void saveButton() {
        Button saveButton = new Button(this);
        saveButton.setHeight(WRAP_CONTENT);
        saveButton.setText("Save");
        saveButton.setOnClickListener(submitListener);
        layout1.addView(saveButton,params);
    }

    // Access the value of the EditText

    private View.OnClickListener submitListener = new View.OnClickListener() {
        public void onClick(View view) {
            StringBuilder stringBuilder = new StringBuilder();
            for (View singView : allViews) {

                String className = Utils.getClassName(singView.getClass());

                if (className.equalsIgnoreCase("EditText")) {
                    EditText editText = (EditText) singView;
                    stringBuilder.append(" "+editText.getText().toString());
                } else if (className.equalsIgnoreCase("Spinner")) {
                    Spinner spiner = (Spinner) singView;
                    stringBuilder.append(" "+spiner.getSelectedItem());
                }
                else if (className.equalsIgnoreCase("CheckBox")) {
                    CheckBox checkBox = (CheckBox) singView;
                    stringBuilder.append(" "+checkBox.isChecked());
                }

            }
            Log.i("All Data ", stringBuilder.toString());

            Utils.showAlertDialog(view.getContext(), "Data", stringBuilder.toString());
        }
    };


    public void createEditText(String hint) {
        EditText editText = new EditText(this);
        editText.setId(viewsCount++);
        editText.setHint(hint);
        allViews.add(editText);
        layout1.addView(editText,params);

    }

    public void createSpinner(List<String> spinnerList) {



        Spinner spinner = new Spinner(this);
        spinner.setId(viewsCount++);
        spinner.setBackgroundResource(R.drawable.dropdown_normal_holo_light);
        ArrayAdapter<String> spinnerArrayAdapter = new ArrayAdapter<String>(this, android.R.layout.simple_spinner_dropdown_item, spinnerList);
        spinner.setAdapter(spinnerArrayAdapter);
        allViews.add(spinner);
        layout1.addView(spinner,params);
    }


    public void createCheckBox(String label) {

        final CheckBox checkBox = new CheckBox(this);
        checkBox.setId(viewsCount++);
        checkBox.setText(label);
        checkBox.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {


            }
        });
        allViews.add(checkBox);
        layout1.addView(checkBox,params);
    }




}

Util.java

package com.pratap.dynamicforms;

import android.app.AlertDialog;
import android.content.Context;
import android.util.Log;
import android.view.Gravity;
import android.widget.Toast;

public class Utils

{


    public static void showAlertDialog(Context context, String title,
                                       String message) {
        AlertDialog.Builder builder = new AlertDialog.Builder(context);
        if (title != null)
            builder.setTitle(title);
        builder.setMessage(message);
        builder.setNegativeButton("OK", null);
        builder.show();
    }

    /**
     *
     * @param c
     * @return
     */

    public static String getClassName(Class c) {
        String className = c.getName();
        int firstChar;
        firstChar = className.lastIndexOf('.') + 1;
        if (firstChar > 0) {
            className = className.substring(firstChar);
        }
        return className;
    }
}

Screen Shot

Download Source Code Link