Android

Using ConnectivityManager class we can detect Internet connection availability in Android. Code: ConnectionDetector.java import android.content.Context; import android.net.ConnectivityManager; import android.net.NetworkInfo; public class ConnectionDetector { private Context _context; public ConnectionDetector(Context context){ this._context = context; } /** * Checking for all possible internet providers * **/ public boolean isConnectingToInternet(){ ConnectivityManager connectivity = (ConnectivityManager) _context.getSystemService(Context.CONNECTIVITY_SERVICE); if (connectivity != null) { NetworkInfo[] info = connectivity.getAllNetworkInfo(); if (info != null) for (int i = 0; i MainActivity.java import android.os.Bundle; import android.app.Activity; import android.view.View; public class MainActivity extends Activity { // Connection detector class Connect...

db4o is a Object oriented database. This tutorial was written to get you started with db4o as quickly as possible. Before you start, please make sure that you have downloaded the latest db4o distribution from the db4objects website . In this tutorial I have used db4o-8.0.184.15484-all-java5.jar from dropbox.com Then kindly put the file in your project's lib folder and configure project's Build Path . Enough, Let us start !!! 1. Create a class to configure db4o. I named it as Db4oHelper. Code: Db4oHelper.java import java.io.IOException; import android.content.Context; import android.util.Log; import com.db4o.Db4oEmbedded; import com.db4o.ObjectContainer; import com.db4o.config.EmbeddedConfiguration; public class Db4oHelper { private static ObjectContainer oc = null; private Context context; /** * @param ctx */ public Db4oHelper(Context ctx) { context = ctx; } /** * Create, open and close the database */ public ObjectContainer db() { try { ...

This post is a simple drawing example using Canvas, BitMap, Paint and Path classes from Android. Code: MainActivity.java import java.util.ArrayList; import android.app.Activity; import android.content.Context; import android.graphics.Bitmap; import android.graphics.Canvas; import android.graphics.Color; import android.graphics.Paint; import android.graphics.Path; import android.os.Bundle; import android.view.MotionEvent; import android.view.View; import android.view.ViewGroup.LayoutParams; import android.widget.LinearLayout; public class DrwaingActivity extends Activity { View mView; private Paint mPaint; @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.activity_main); LinearLayout layout = (LinearLayout) findViewById(R.id.myDrawing); mView = new DrawingView(this); layout.addView(mView, new LayoutParams( LinearLayout.LayoutParams.MATCH_PARENT, LinearLayout.LayoutParams.MATCH_PARENT...

Consider using simple NavigationView instead of this old sliding menu , which based on Material design and much simpler and very flexible than this Navigation drawer. This post will help you to create a simple sliding menu in Android. Here sliding menu is a listview which is in INVISIBLE state. It will comes to VISIBLE state once you click the menu button. And it will go to INVISIBLE state again once you pick the item from listview. To change the state we are using animation, that is why it looks like sliding. Complete code: MainActivity.java package com.android.slidingmenuexample; import android.os.Bundle; import android.support.v4.app.Fragment; import android.support.v4.app.FragmentActivity; import android.support.v4.app.FragmentManager; import android.support.v4.app.FragmentTransaction; import android.view.Menu; import android.view.View; import android.view.View.OnClickListener; import android.widget.AdapterView; import android.widget.ArrayAdapter; import android.widget.Butt...

We know, We can send an e-mail using Intents, This will invoke either default mail app or built-in device mail apps to send an e-mail. This is unnecessary for user to work on e-mail application while he is trying to work an our application. So the question is how to send an e-mail from android application without user interaction? Answer is you can achieve this using JavaMail API . You have to use following three jars. mail.jar activation.jar additionnal.jar Complete code: MainActivity.java package com.exmple.javamail; import android.app.Activity; import android.app.ProgressDialog; import android.os.AsyncTask; import android.os.Bundle; import android.view.View; import android.widget.Button; import android.widget.EditText; import android.widget.Toast; import java.io.UnsupportedEncodingException; import java.util.Properties; import javax.mail.Message; import javax.mail.MessagingException; import javax.mail.PasswordAuthentication; import javax.mail.Session; import javax.mail....

You can extract zip file by using ZipInputStream class in android. MainActivity.java package com.android.zipextracter; import java.io.BufferedInputStream; import java.io.File; import java.io.FileInputStream; import java.io.FileOutputStream; import java.io.IOException; import java.io.InputStream; import java.util.zip.ZipEntry; import java.util.zip.ZipInputStream; import android.os.Bundle; import android.os.Environment; import android.widget.Toast; import android.app.Activity; public class MainActivity extends Activity { @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.activity_main); String zipFilePath = Environment.getExternalStorageDirectory() .getAbsolutePath()+"/"; unpackZip(zipFilePath, "MyRar.zip"); } private boolean unpackZip(String path, String zipname) { InputStream is; ZipInputStream zis; try { String filename; is = new FileInputStream(path + zipn...

By this example you can access your DialogFragment throughout the application. You can send arguments to DialogFragment, and also you can retrieve values from DialogFragment. Screenshot: Code: MyCustomDialog.java package com.andoid.dialogfragment; import android.app.Dialog; import android.app.DialogFragment; import android.graphics.Color; import android.graphics.drawable.ColorDrawable; import android.os.Bundle; import android.view.View; import android.view.View.OnClickListener; import android.view.Window; import android.view.WindowManager; import android.widget.Button; import android.widget.EditText; public class MyCustomDialog extends DialogFragment { Button mButton; EditText mEditText; onSubmitListener mListener; String text = ""; interface onSubmitListener { void setOnSubmitListener(String arg); } @Override public Dialog onCreateDialog(Bundle savedInstanceState) { final Dialog dialog = new Dialog(getActivity()); dialog.getWindow().requestFeature(Wi...