Coderzworld

Preference Activity is a base class mainly used for setting order of preferences of an user.It is mainly used for creating setting page of an user.In this example I am just showing how to set Preferences. First create an Activity MainActivity.java Here on clicking preference example button a page will be opened to set the preferences. On clicking the show values we can see the see the values that we have set. MainActivity.java import android.app.Activity; import android.content.Intent; import android.os.Bundle; import android.view.Menu; import android.view.MenuItem; import android.view.View; import android.view.View.OnClickListener; import android.widget.Button; public class MainActivity extends Activity { @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.activity_main); Button btn = (Button) findViewById(R.id.btn_pref); Button btn1 = (Button) findViewById(R.id.btn_values); btn.setOnCli...

In Android we can communicate with server using HTTP request methods for getting some details from the server.We use RESTful service.Mainly we use two types of HTTP request HTTP GET(),HTTP POST() methods. In some case we have to give some values to the server for fetching some informations, then we use commonly HTTP POST() and if we simply want to request for some datas we use HTTP GET(). Lets see HTTP POST() method. public void getResponse(String a, String b) { HttpClient httpclient = new DefaultHttpClient(); HttpPost httppost = new HttpPost("URL"); //here write the url List < NameValuePair > nameValueList = new ArrayList < NameValuePair > (2); nameValueList.add(new BasicNameValuePair("keyword", a)); nameValueList.add(new BasicNameValuePair("keyword", b)); try { httppost.setEntity(new UrlEncodedFormEntity(nameValueList)); HttpResponse response = httpclient.execute(httppost); Log.i(...

Let's record a video :). Check the code snippet. First need to give necessary permissions. So add these permissions to AndroidManifest.xml   <uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE" />   <uses-permission android:name="android.permission.RECORD_AUDIO" /> MainActivity.java import java.io.File; import java.text.SimpleDateFormat; import java.util.Date; import java.util.Locale; import android.app.Activity; import android.content.Intent; import android.content.pm.PackageManager; import android.graphics.Color; import android.graphics.drawable.ColorDrawable; import android.net.Uri; import android.os.Bundle; import android.os.Environment; import android.provider.MediaStore; import android.util.Log; import android.view.View; import android.view.View.OnClickListener; import android.widget.Button; import android.widget.Toast; public class MainActivity extends Activity implements OnClickListener { Button btn_record; pu...

Ever wonder how to drag and drop in android. Lets check how to drag and drop image in android. MainActivity.java package com.example.dragdrop; import android.app.Activity; import android.content.ClipData; import android.content.ClipDescription; import android.graphics.Bitmap; import android.graphics.BitmapFactory; import android.graphics.Matrix; import android.os.Bundle; import android.util.Log; import android.view.DragEvent; import android.view.MotionEvent; import android.view.View; import android.view.View.DragShadowBuilder; import android.view.View.OnClickListener; import android.view.View.OnDragListener; import android.view.View.OnTouchListener; import android.widget.ImageView; import android.widget.SeekBar; import android.widget.ImageView.ScaleType; import android.widget.RelativeLayout; import android.widget.SeekBar.OnSeekBarChangeListener; public class MainActivity extends Activity { ImageView img_model, img_chain; private static final String IMAGEVI...

 We can call fragment as a sub activity. By using fragment navigation will more easier and in tabs layouts look cool.Let us see an example..... Here we have 2 fragment class Details, and Detail2. MainActivity.java import android.app.Activity; import android.app.Fragment; import android.app.FragmentTransaction; import android.os.Bundle; public class MainActivity extends Activity { @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.activity_main); //Here we call the first fragment Fragment fragment = null; fragment = new Options(); FragmentTransaction fragmentTransaction = getFragmentManager() .beginTransaction(); fragmentTransaction.replace(R.id.frame1, fragment).commit(); } } Options.java import android.app.Fragment; import android.app.FragmentManager; import android.app.FragmentTransaction; import android.os.Bundle; import android.view.LayoutInflater; import android.view....

I always wonder the use of a flash light on a phone. This simple app is more useful than anything. So here is the code to build a flashlight app, MainActivity.java import android.app.Activity; import android.app.AlertDialog; import android.content.DialogInterface; import android.content.pm.PackageManager; import android.hardware.Camera; import android.hardware.Camera.Parameters; import android.media.MediaPlayer; import android.media.MediaPlayer.OnCompletionListener; import android.os.Bundle; import android.util.Log; import android.view.View; import android.widget.ImageButton; public class MainActivity extends Activity { ImageButton btnSwitch; private Camera camera; private boolean isFlashOn; private boolean hasFlash; Parameters params; MediaPlayer mp; @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.activity_main); // flash switch button ...

We can easily save the contacts to the phone contacts without having any database of own . The code is very simple. import android.app.Activity; import android.app.AlertDialog; import android.content.ComponentName; import android.content.ContentValues; import android.content.DialogInterface; import android.content.Intent; import android.database.Cursor; import android.net.Uri; import android.os.Bundle; import android.provider.Contacts; import android.provider.Contacts.People; import android.provider.ContactsContract; import android.provider.ContactsContract.CommonDataKinds.Phone; import android.view.View; import android.view.View.OnClickListener; import android.widget.Button; import android.widget.EditText; public class MainActivity extends Activity { protected static final int PICK_CONTACT = 0; EditText edt1,edt2; Button btn; String s1,s2; @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.activ...

For getting the list of all running apps installed in the device and to show it on a listview we can use the following code: MainActivity.java import java.util.ArrayList; import java.util.List; import android.app.ActivityManager; import android.app.ActivityManager.RunningAppProcessInfo; import android.content.Intent; import android.content.pm.ApplicationInfo; import android.content.pm.PackageManager; import android.os.Bundle; import android.support.v7.app.ActionBarActivity; import android.widget.ArrayAdapter; import android.widget.ListView; public class MainActivity extends ActionBarActivity { ArrayList results_sys_app = new ArrayList(); //ArrayAdapter<ApplicationInfo> adapter; ArrayAdapter<ApplicationInfo> adapter; @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.activity_main); /*final Intent mainIntent = new Intent(Intent.ACTION_MAIN, null); mainIntent.addCategory(Intent.CA...

For getting the list of all apps installed in the device and to show it on a listview we can use the following code: MainActivity.java import java.util.ArrayList; import java.util.List; import android.content.Intent; import android.content.pm.ApplicationInfo; import android.content.pm.PackageManager; import android.os.Bundle; import android.support.v7.app.ActionBarActivity; import android.widget.ArrayAdapter; import android.widget.ListView; public class MainActivity extends ActionBarActivity { ArrayList results_sys_app = new ArrayList(); ArrayAdapter<applicationinfo>adapter; @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.activity_main); final Intent mainIntent = new Intent(Intent.ACTION_MAIN, null); mainIntent.addCategory(Intent.CATEGORY_LAUNCHER); final List<applicationinfo> pkgAppsList = this.getPackageManager().getInstalledApplications( PackageManager.GET_UNINSTALLED_PAC...

    When we implements an interface in a class, its abstract methods are implemented in the  class.Lets see the example. First we created an interface ApplicationInterface  ApplicationInterface .java public interface ApplicationInterface { public void activityStarted(); public void activityAborted(); public void activityStopped(); public void activityDone(); } public class MainActivity extends Activity implements ApplicationInterface { @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.activity_main); } // these are the methods implemented using interface @Override public void activityStarted() { // TODO Auto-generated method stub } @Override public void activityAborted() { // TODO Auto-generated method stub } @Override public void activityStopped() { // TODO Auto-generated method stub } @Override public void activityDone() { // TODO Auto-generated...

Recently i had create a thumbnail from a video recorded in an Android Phone. I found out an easy way to create thumbnail using the ThumbNailUtils class. Code for creating a thumbnail of a Video and saving it in a folder named "online" in the sdcard, in Android: String path = Environment.getExternalStorageDirectory().getAbsolutePath()+"/online"; File mediaFile = new File(path); if(!mediaFile.exists()){ mediaFile.mkdir(); } File file = new File(mediaFile, "/IMG_"+timeStamp+".PNG".toString()); Bitmap thumbnail1 = ThumbnailUtils.createVideoThumbnail( selectedvideopath,MediaStore.Video.Thumbnails.MINI_KIND ); if (file.exists()) file.delete(); try { FileOutputStream out = new FileOutputStream(file); thumbnail1.compress(Bitmap.CompressFormat.JPEG, 90, out); out.flush(); out.close(); } catch (Exception e) { e.printStackTrace(); } String fileimg=file.getAbsolutePath().toString(); //fileimg has the path of thethubnail created Byt...