Get Phone State When Someone is calling using BroadcastReceiver

Get Phone State When Someone is calling using BroadcastReceiver 

In this article we shall try to listen to the phone state when contacts are calling us. 

First of all we need to set our Manifest file to listen to the Phone State, to do that we need to edit our it.

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1. <application>  
2.   .....  
3.   <receiver android:name=".ServiceReceiver">  
4.     <intent-filter>  
5.       <action android:name="android.intent.action.PHONE_STATE" />  
6.     </intent-filter>  
7. </receiver>  
8. </application>  
9. <uses-permission android:name="android.permission.READ_PHONE_STATE">  
10. </uses-permission>  

Here you can see that we created a receiver xml node inside our application and have the java class ServiceReceiver to listen to it. What it would listen to is the PHONE_STATE and thus we need the permission of READ_PHONE_STATE. Then our ServiceReceiver Class would look like this.

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1. public class ServiceReceiver extends BroadcastReceiver {  
2.   @Override  
3.   public void onReceive(Context context, Intent intent) {  
4.     MyPhoneStateListener phoneListener=new MyPhoneStateListener();  
5.     TelephonyManager telephony = (TelephonyManager)   
6.     context.getSystemService(Context.TELEPHONY_SERVICE);  
7.     telephony.listen(phoneListener,PhoneStateListener.LISTEN_CALL_STATE);  
8.   }  
9. }  

For the full class including the imports, please download the files below. In here we have another class called MyPhoneStateListener, which would be shown at the bottom. What this class would do is execute the phoneListener when the telephony.listen has received a LISTEN_CALL_STATE.

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1. public class MyPhoneStateListener extends PhoneStateListener {  
2.   public void onCallStateChanged(int state,String incomingNumber){  
3.   switch(state){  
4.     case TelephonyManager.CALL_STATE_IDLE:  
5.       Log.d("DEBUG", "IDLE");  
6.     break;  
7.     case TelephonyManager.CALL_STATE_OFFHOOK:  
8.       Log.d("DEBUG", "OFFHOOK");  
9.     break;  
10.     case TelephonyManager.CALL_STATE_RINGING:  
11.       Log.d("DEBUG", "RINGING");  
12.     break;  
13.     }  
14.   }   
15. }  

What we have is a function called onCallStateChanged which would be fired when the LISTEN_CALL_STATE dispatches it. The states are either, ringing(CALL_STATE_RINGING), answers (CALL_STATE_OFFHOOK), or hang up/end call (CALL_STATE_IDLE). To see the logs in eclipse. Go to Window -> Show View -> Other -> Android -> LogCat

Hope it helps.


Sources
AndroidManifest.xml
ServiceReceiver.java
MyPhoneStateListener.java


References
BroadcastReceiver 

ViewFlipper in Android

ViewFlipper is used to do animation when switching between views. There are lot of options for doing animations between views like ViewAnimator, LayoutAnimationController, applying animation to the view itself. But I feel ViewFlipper is the better option for doing animation for switching views.

In this I am controlling the switching between views using user interaction(Button click). We can set duration also for switching between views.

The complete code for showing ViewFlipper is,

public class ShowFlipper extends Activity {

 ViewFlipper flipper;
 Button button1;
 Button button2;
 LinearLayout l1;
 LinearLayout l2;
 TextView tv1, tv2, tv3, tv4, tv5, tv6;

 @Override
 public void onCreate(Bundle savedInstanceState) {
  super.onCreate(savedInstanceState);
  LayoutParams params = new LayoutParams(LayoutParams.WRAP_CONTENT,
    LayoutParams.WRAP_CONTENT);

  flipper = new ViewFlipper(this);
  l1 = new LinearLayout(this);
  l2 = new LinearLayout(this);
  button1 = new Button(this);
  button2 = new Button(this);
  button1.setText("Button 1");
  button2.setText("Button 2");

  l1.setOrientation(LinearLayout.VERTICAL);
  l2.setOrientation(LinearLayout.VERTICAL);
  tv1 = new TextView(this);
  tv2 = new TextView(this);
  tv3 = new TextView(this);
  tv4 = new TextView(this);
  tv5 = new TextView(this);
  tv6 = new TextView(this);
  tv1.setText("text view 1");
  tv2.setText("text view 2");
  tv3.setText("text view 3");
  tv4.setText("text view 4");
  tv5.setText("text view 5");
  tv6.setText("text view 6");
  l1.addView(tv1, params);
  l1.addView(tv2, params);
  l1.addView(tv3, params);
  l1.addView(button1, params);
  l2.addView(tv4, params);
  l2.addView(tv5, params);
  l2.addView(tv6, params);
  l2.addView(button2, params);

  flipper.addView(l1);
  flipper.addView(l2);

  button1.setOnClickListener(new View.OnClickListener() {
   public void onClick(View view) {
    flipper.setInAnimation(inFromRightAnimation());
    flipper.setOutAnimation(outToLeftAnimation());
    flipper.showNext();
   }
  });

  button2.setOnClickListener(new View.OnClickListener() {
   public void onClick(View view) {
    flipper.setInAnimation(inFromLeftAnimation());
    flipper.setOutAnimation(outToRightAnimation());
    flipper.showPrevious();
   }
  });
  setContentView(flipper);
 }

 private Animation inFromRightAnimation() {
  Animation inFromRight = new TranslateAnimation(
    Animation.RELATIVE_TO_PARENT, +1.0f,
    Animation.RELATIVE_TO_PARENT, 0.0f,
    Animation.RELATIVE_TO_PARENT, 0.0f,
    Animation.RELATIVE_TO_PARENT, 0.0f);
  inFromRight.setDuration(500);
  inFromRight.setInterpolator(new AccelerateInterpolator());
  return inFromRight;
 }

 private Animation outToLeftAnimation() {
  Animation outtoLeft = new TranslateAnimation(
    Animation.RELATIVE_TO_PARENT, 0.0f,
    Animation.RELATIVE_TO_PARENT, -1.0f,
    Animation.RELATIVE_TO_PARENT, 0.0f,
    Animation.RELATIVE_TO_PARENT, 0.0f);
  outtoLeft.setDuration(500);
  outtoLeft.setInterpolator(new AccelerateInterpolator());
  return outtoLeft;
 }

 private Animation inFromLeftAnimation() {
  Animation inFromLeft = new TranslateAnimation(
    Animation.RELATIVE_TO_PARENT, -1.0f,
    Animation.RELATIVE_TO_PARENT, 0.0f,
    Animation.RELATIVE_TO_PARENT, 0.0f,
    Animation.RELATIVE_TO_PARENT, 0.0f);
  inFromLeft.setDuration(500);
  inFromLeft.setInterpolator(new AccelerateInterpolator());
  return inFromLeft;
 }

 private Animation outToRightAnimation() {
  Animation outtoRight = new TranslateAnimation(
    Animation.RELATIVE_TO_PARENT, 0.0f,
    Animation.RELATIVE_TO_PARENT, +1.0f,
    Animation.RELATIVE_TO_PARENT, 0.0f,
    Animation.RELATIVE_TO_PARENT, 0.0f);
  outtoRight.setDuration(500);
  outtoRight.setInterpolator(new AccelerateInterpolator());
  return outtoRight;
 }
}

You can download the full source code from here