Skip to main content

Broadcast Receiver Introduction in Android

A broadcast receiver is a component that responds to system-wide broadcast announcements. Many broadcasts originate from the system—for example, a broadcast announcing that the screen has turned off, the battery is low, or a picture was captured. There are two ways to use broad cast receiver in android --
  • One is using dynamically in activity
  • Second to register through manifest
Using dynamically in activity
Register broadcast receiver Via dynamically ( Run time )
 
// Create reciever object
  private BroadcastReceiver the_receiver = new PhoneCall();
  // Set When broadcast event will fire.
  private IntentFilter filter = new IntentFilter(Intent.ACTION_CONFIGURATION_CHANGED);
  // Register new broadcast receiver
  this.registerReceiver(the_receiver, filter);
  // Reciever class which extends BroadcastReceiver
  public class PhoneCall extends BroadcastReceiver {
  public void onReceive(Context context, Intent intent) {
  // Phone call state change then this method will automaticaly called
  }
   }
Register through manifest
Register broadcast receiver Via the AndroidManifest.xml file.
 
   
  
  
  

When android.intent.action.PHONE_STATE Event will fire ( call recieved/pick/end ), then onReceive method in PhoneCall.java file will automaticaly call.
Now Create PhoneCall.java file
 
// Reciever class which extends BroadcastReceiver
   public class PhoneCall extends BroadcastReceiver {
      public void onReceive(Context context, Intent intent) {
       // Phone call state change then this method will automaticaly called
       }}

Comments

Popular posts from this blog

Getting started with IBM worklight Mobile App In Eclipse using Ionic / Angularjs

Install Eclipse and add IBM MobileFirst Platform Studio 7.1.0 .  You can follow the following steps : Goto Help > > Eclipse Market Place >> and search for IBM MobileFirst Platform Studio 7.1.0 . and u can add and install thet plugin and get started with ionic - angular app development. You can start the new project and so can add your Environment needed and start development. After creating the sample project you can add ionic bundle folder inside your application so that you get all the necessary features of ionic development. Details and other way of installation is explained here  

Spannable String in Android - URL Span ,Clickable Span, Rich-Style Formatting of Textview .....

See more Android Tutorials here....... Faster Loading images in GridViews or ListViews Spannable brings lots of possibility to TextView, includes displaying various appearance of a Text and onClick callbak. The SpannableString class allows you to easily format certain pieces which are called spans of a string, by applying CharacterStyle ie,color, font, ormake it a link . Here is an example where, explained how to use spannable string to give font size, color, linking a text via clickable span and through URL Span and to strike through the text. Lets go through the example : import android.os.Bundle; import android.text.SpannableString; import android.text.method.LinkMovementMethod; import android.text.style.ClickableSpan; import android.text.style.ForegroundColorSpan; import android.text.style.RelativeSizeSpan; import android.text.style.StrikethroughSpan; import android.text.style.URLSpan; import android.view.View; import android.widget.TextView; import android.widget.Toast; ...

Passing Images between Activities in Android

in First Activity: Intent intent=new Intent(FirstClass.this, SecondClass.class); Bundle bundle=new Bundle(); bundle.putInt("image",R.drawable.ic_launcher); intent.putExtras(bundle); startActivity(intent); in Second Acticity: Bundle bundle=this.getIntent().getExtras(); int pic=bundle.getInt("image"); v.setImageResource(pic); another method: in First Activity: Drawable drawable=imgv.getDrawable(); Bitmap bitmap= ((BitmapDrawable)drawable).getBitmap(); ByteArrayOutputStream baos = new ByteArrayOutputStream(); bitmap.compress(Bitmap.CompressFormat.PNG, 100, baos); byte[] b = baos.toByteArray(); Intent intent=new Intent(Passimage.this,myclass.class); intent.putExtra("picture", b); startActivity(intent); in Second Acticity: Bundle extras = getIntent().getExtras(); byte[] b = extras.getByteArray("picture"); Bitmap bmp = BitmapFactory.decodeByteArray(b, 0, b.lengt...