My Android Tutorial

Friday, 6 February 2015

Android Shared Preference - j4android

I will show how to store data internally using shared preference in android programmatically

Please try it your self.

package com.j4android;

import android.app.Activity;                     

import android.os.Bundle;

public class MainActivity extends Activity{

SharedPreferences sh_Pref;
Editor toEdit;
String userName;

@Override
public void onCreate(Bundle bundle){
super.onCreate(bundle);
setContentView(R.layout.main);

sh_Pref = getSharedPreferences("Identity Credentials", MODE_PRIVATE);
toEdit = sh_Pref .edit();
toEdit.putString("userName", "Admin");

toEdit.commit();

userName= sh_Pref.getString("userName", "");

Log.i("Shared Preference stored data ", userName);

}

}

Friday, 30 January 2015

How to get current location in Android - j4android

i will show how to get current location using network and gps provider in android programmatically.

Please try it your self.

package com.j4android;

import android.app.Activity;

import android.os.Bundle;

import android.view.View;

import android.widget.Button;

import android.widget.Toast;

public class MainActivity extends Activity{

Button btnShowLocation;

GPSTracker gps;

@Override
public void onCreate(Bundle bundle){
super.onCreate(bundle);
setContentView(R.layout.main);

btnShowLocation = (Button) findViewById(R.id.btnShowLocation);

// show location button click event
btnShowLocation.setOnClickListener(new View.OnClickListener() {

@Override
public void onClick(View arg0) {
// create class object
gps = new GPSTracker(AndroidGPSTrackingActivity.this);

// check if GPS enabled
if (gps.canGetLocation()) {

double latitude = gps.getLatitude();
double longitude = gps.getLongitude();

// \n is for new line
Toast.makeText(
getApplicationContext(),
"Your Location is - \nLat: " + latitude
+ "\nLong: " + longitude, Toast.LENGTH_LONG)
.show();
} else {
// can't get location
// GPS or Network is not enabled
// Ask user to enable GPS/network in settings
gps.showSettingsAlert();
}

}
});
}

}

GPSTracker.java

package com.j4android;

import android.app.AlertDialog;
import android.app.Service;
import android.content.Context;
import android.content.DialogInterface;
import android.content.Intent;
import android.location.Location;
import android.location.LocationListener;
import android.location.LocationManager;
import android.os.Bundle;
import android.os.IBinder;
import android.provider.Settings;
import android.util.Log;

public class GPSTracker extends Service implements LocationListener {
private final Context mContext;

// flag for GPS status
boolean isGPSEnabled = false;

// flag for network status
boolean isNetworkEnabled = false;

// flag for GPS status
boolean canGetLocation = false;

Location location; // location
double latitude; // latitude
double longitude; // longitude

// The minimum distance to change Updates in meters
private static final long MIN_DISTANCE_CHANGE_FOR_UPDATES = 10; // 10 meters

// The minimum time between updates in milliseconds
private static final long MIN_TIME_BW_UPDATES = 1000 * 60 * 1; // 1 minute

// Declaring a Location Manager
protected LocationManager locationManager;

public GPSTracker(Context context) {
this.mContext = context;

getLocation();
}

public Location getLocation() {
try {
locationManager = (LocationManager) mContext
.getSystemService(Context.LOCATION_SERVICE);

// getting GPS status
isGPSEnabled = locationManager
.isProviderEnabled(LocationManager.GPS_PROVIDER);

// getting network status
isNetworkEnabled = locationManager
.isProviderEnabled(LocationManager.NETWORK_PROVIDER);

if (!isGPSEnabled && !isNetworkEnabled) {
// no network provider is enabled
} else {
this.canGetLocation = true;
if (isNetworkEnabled) {
locationManager.requestLocationUpdates(
LocationManager.NETWORK_PROVIDER,
MIN_TIME_BW_UPDATES,
MIN_DISTANCE_CHANGE_FOR_UPDATES, this);
Log.d("Network", "Network");
if (locationManager != null) {
location = locationManager
.getLastKnownLocation(LocationManager.NETWORK_PROVIDER);
if (location != null) {
latitude = location.getLatitude();
longitude = location.getLongitude();
}
}
}
// if GPS Enabled get lat/long using GPS Services
if (isGPSEnabled) {
if (location == null) {
locationManager.requestLocationUpdates(
LocationManager.GPS_PROVIDER,
MIN_TIME_BW_UPDATES,
MIN_DISTANCE_CHANGE_FOR_UPDATES, this);
Log.d("GPS Enabled", "GPS Enabled");
if (locationManager != null) {
location = locationManager
.getLastKnownLocation(LocationManager.GPS_PROVIDER);
if (location != null) {
latitude = location.getLatitude();
longitude = location.getLongitude();
}
}
}
}
}

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

return location;
}

/**
* Stop using GPS listener
* Calling this function will stop using GPS in your app
* */
public void stopUsingGPS(){
if(locationManager != null){
locationManager.removeUpdates(GPSTracker.this);
}
}

/**
* Function to get latitude
* */
public double getLatitude(){
if(location != null){
latitude = location.getLatitude();
}

// return latitude
return latitude;
}

/**
* Function to get longitude
* */
public double getLongitude(){
if(location != null){
longitude = location.getLongitude();
}

// return longitude
return longitude;
}

/**
* Function to check GPS/wifi enabled
* @return boolean
* */
public boolean canGetLocation() {
return this.canGetLocation;
}

/**
* Function to show settings alert dialog
* On pressing Settings button will lauch Settings Options
* */
public void showSettingsAlert(){
AlertDialog.Builder alertDialog = new AlertDialog.Builder(mContext);

// Setting Dialog Title
alertDialog.setTitle("GPS is settings");

// Setting Dialog Message
alertDialog.setMessage("GPS is not enabled. Do you want to go to settings menu?");

// On pressing Settings button
alertDialog.setPositiveButton("Settings", new DialogInterface.OnClickListener() {
public void onClick(DialogInterface dialog,int which) {
Intent intent = new Intent(Settings.ACTION_LOCATION_SOURCE_SETTINGS);
mContext.startActivity(intent);
}
});

// on pressing cancel button
alertDialog.setNegativeButton("Cancel", new DialogInterface.OnClickListener() {
public void onClick(DialogInterface dialog, int which) {
dialog.cancel();
}
});

// Showing Alert Message
alertDialog.show();
}

@Override
public void onLocationChanged(Location location) {

Log.d("onLocationChanged", "onLocationChanged");
}

@Override
public void onProviderDisabled(String provider) {
}

@Override
public void onProviderEnabled(String provider) {
}

@Override
public void onStatusChanged(String provider, int status, Bundle extras) {
}

@Override
public IBinder onBind(Intent arg0) {
return null;
}


}

main.xml:

<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="fill_parent"
android:layout_height="fill_parent"
android:orientation="vertical" >

<Button android:id="@+id/btnShowLocation"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="Show Location"
android:layout_centerVertical="true"
android:layout_centerHorizontal="true"/>

</RelativeLayout>

note:
Don't forget to add permission

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

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

Friday, 9 January 2015

Android map show using intent - j4android

I will show map programmatically using map intent in andriod.

Please try it your self.

String uri ="geo:" + latitudeValue + "," + longitudeValue + "?z=" + 3;
Intent intent = new Intent(android.content.Intent.ACTION_VIEW, Uri.parse(uri));
startActivity(intent);

Friday, 19 December 2014

Android AutoCompleteEditText - j4android

I will show how to create AutoCompleteTextView and MultiAutoCompleteTextView in android programmatically.

Please try it your self.

package com.j4android;

import android.os.Bundle;

import android.app.Activity;

import android.view.View;

import android.widget.AdapterView;

import android.widget.AdapterView.OnItemClickListener;

import android.widget.ArrayAdapter;

import android.widget.AutoCompleteTextView;

import android.widget.MultiAutoCompleteTextView;

import android.widget.Toast;

public class MainActivity extends Activity{
private AutoCompleteTextView autoComplete;
private MultiAutoCompleteTextView multiAutoComplete;
private ArrayAdapter<String> adapter;
String[] srt_array = { "arjun", "anbu", "anandh", "babu", "balu", "balaji",
"cinna", "dinesh", "darvin", "edward", "edvin", "faishal", "guru",
"ganesh", "harish", "hariharan", "sasi", "varun", "yamini" };
@Override
public void onCreate(Bundle bundle){
super.onCreate(bundle);
setContentView(R.layout.main);

// get the defined string-array
String[] colors = getResources().getStringArray(R.array.colorList);

adapter = new ArrayAdapter<String>(this,
android.R.layout.simple_list_item_1, srt_array);

autoComplete = (AutoCompleteTextView) findViewById(R.id.autoComplete);
multiAutoComplete = (MultiAutoCompleteTextView) findViewById(R.id.multiAutoComplete);

// set adapter for the auto complete fields
autoComplete.setAdapter(adapter);
multiAutoComplete.setAdapter(adapter);

// specify the minimum type of characters before drop-down list is shown
autoComplete.setThreshold(1);
multiAutoComplete.setThreshold(2);
// comma to separate the different colors
multiAutoComplete
.setTokenizer(new MultiAutoCompleteTextView.CommaTokenizer());

// when the user clicks an item of the drop-down list
multiAutoComplete.setOnItemClickListener(new OnItemClickListener() {

@Override
public void onItemClick(AdapterView<?> arg0, View arg1, int arg2,
long arg3) {
Toast.makeText(getBaseContext(),
"" + arg0.getItemAtPosition(arg2), Toast.LENGTH_LONG)
.show();
}
});
}

}

main.xml:

<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
android:id="@+id/LinearLayout1"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:orientation="vertical" >

<AutoCompleteTextView
android:id="@+id/autoComplete"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_below="@+id/text1"
android:layout_marginTop="20dp"
android:ems="8" />
<MultiAutoCompleteTextView
android:id="@+id/multiAutoComplete"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_below="@+id/text2"
android:layout_marginTop="20dp"
android:ems="13" />

</LinearLayout>

Thursday, 18 December 2014

Android WebView example - j4android

I will show simple code how to load a url or website inside to webview in android.

Please try it your self.
package com.j4android;

import android.app.Activity;

import android.os.Bundle;

import android.view.View;

import android.webkit.WebView;

import android.webkit.WebViewClient;

public class MainActivity extends Activity {

 WebView webview ;

 @Override

 public void onCreate(Bundle savedInstanceState) {

  super.onCreate(savedInstanceState);

  setContentView(R.layout.main);

  webview = (WebView) findViewById(R.id.webView1);

  webViewCallingMethod();

 }

 private class MyWebViewClient extends WebViewClient {

  @Override

  public boolean shouldOverrideUrlLoading(WebView view, String url) {

   view.loadUrl(url);

   return true;

  }

 }

 public void webViewCallingMethod() {

  webview.setWebViewClient(new MyWebViewClient());

  webview.getSettings().setJavaScriptEnabled(true);

  webview.loadUrl("http://www.google.com");

 }

}

main.xml:

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

Sunday, 23 November 2014

Android - Spinner Dropdown Example

I will show simple code how to create Spinner (drop down list) in android programmatically.
Please try it your self.

package com.j4android;

import java.util.ArrayList;

import android.app.Activity;
import android.os.Bundle;
import android.view.View;
import android.widget.AdapterView;
import android.widget.AdapterView.OnItemSelectedListener;
import android.widget.ArrayAdapter;
import android.widget.Spinner;
import android.widget.Toast;

public class MainActivity extends Activity implements OnItemSelectedListener {
Spinner spinner1;
ArrayAdapter spinnerArrayAdapter1;
ArrayList<String> results = new ArrayList<String>();

@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.main);
results.add("India");
results.add("Singapore");
results.add("US");
results.add("UK");

spinner1 = (Spinner) findViewById(R.id.spinner1);
spinnerArrayAdapter1 = new ArrayAdapter<String>(getApplicationContext(), android.R.layout.simple_spinner_item, results);
spinnerArrayAdapter1.setDropDownViewResource(android.R.layout.simple_spinner_item);
spinner1.setAdapter(spinnerArrayAdapter1);
spinner1.setOnItemSelectedListener(this);
}
public void onItemSelected(AdapterView<?> parent, View view, int pos,long id) {
Toast.makeText(parent.getContext(),
"OnItemSelectedListener : " + parent.getItemAtPosition(pos).toString(),
Toast.LENGTH_SHORT).show();
}

@Override
public void onNothingSelected(AdapterView<?> parent) {
// TODO Auto-generated method stub

}

}

main.xml:

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:id="@+id/linear_setting"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:background="@color/main_bg"
android:orientation="vertical" >

<Spinner
android:id="@+id/spinner1"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_gravity="center" />

</LinearLayout>

Thursday, 20 November 2014

Android - Custom Toast

I will show sample code how to create Custom Toast in android programmatically.

Please try it your self.

package com.j4android;

import android.app.Activity;

import android.os.Bundle;

import android.view.Gravity;

import android.view.LayoutInflater;

import android.view.View;

import android.view.View.OnClickListener;

import android.view.ViewGroup;

import android.widget.Button;

import android.widget.TextView;

import android.widget.Toast;

public class MainActivity extends Activity {

 Button toastButton;

 @Override

 public void onCreate(Bundle bundle) {

  super.onCreate(bundle);

  setContentView(R.layout.main);

  toastButton = (Button) findViewById(R.id.toast_btn);

  toastButton.setOnClickListener(new OnClickListener() {

   @Override

   public void onClick(View v) {

    // TODO Auto-generated method stub

    LayoutInflater inflater = getLayoutInflater();

    View layout = inflater.inflate(R.layout.custom_toast,

      (ViewGroup) findViewById(R.id.toast_layout_root));

    TextView text = (TextView) layout.findViewById(R.id.text);

    text.setText("Custom Toast");

    Toast toast = new Toast(getApplicationContext());

    toast.setGravity(Gravity.CENTER_VERTICAL, 0, 0);

    toast.setDuration(Toast.LENGTH_LONG);

    toast.setView(layout);

    toast.show();

   }

  });

 }

}

main.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="match_parent"
android:background="@drawable/button_bg_gradient"
android:orientation="vertical" >

<Button
android:id="@+id/toast_btn"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="Click" />

</LinearLayout>

custom_toast.xml: