Android dialer application

1. Create a simple Android application (our dialer). To actually call someone, you just need that method:

   private void performDial(String numberString) {
       if (!numberString.equals("")) {
          Uri number = Uri.parse("tel:" + numberString);
          Intent dial = new Intent(Intent.ACTION_CALL, number);
          startActivity(dial);
       }
   }
   

2. Give your application permission to call in AndroidManifest

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

3. Set in AndroidManifest intention that says to your phone to use your app when need a dialer

When someone press the call button:

    <intent-filter>
        <action android:name="android.intent.action.CALL_BUTTON" />
        <category android:name="android.intent.category.DEFAULT" />
    </intent-filter>

When someone fire an URI:

    <intent-filter>
        <action android:name="android.intent.action.VIEW" />
        <action android:name="android.intent.action.DIAL" />
        <category android:name="android.intent.category.DEFAULT" />
        <category android:name="android.intent.category.BROWSABLE" />
        <data android:scheme="tel" />
    </intent-filter>