Android Hands-on tutorial The third simple implementation call function _android

The example of this article for you to share the Android phone function of the implementation code, need a text input box input number, need a button to call.

Essence: Click on the button to invoke the system call function.

XML layout file code::

<linearlayout xmlns:android= "http://schemas.android.com/apk/res/android" 
 xmlns:tools= "http:// Schemas.android.com/tools " 
 android:layout_width=" match_parent " 
 android:layout_height=" Match_parent " 
 tools:context= ". Mainactivity " 
 android:orientation=" vertical " 
 > 
 
 <textview 
  android:layout_width=" Wrap_ Content " 
  android:layout_height=" wrap_content " 
  android:text=" Please enter the number/> 
 <edittext 
  Android:id= "@+id/et_phone" 
  android:layout_width= "match_parent" 
  android:layout_height= "Wrap_content" 
  /> 
 <button 
  android:id= "@+id/bt_call" 
  android:layout_width= "Wrap_content" 
  android:layout_height= "Wrap_content" 
  android:text= "dial" 
  /> 
 

Code in Mainactivity:

Package Com.ydl.dialer; 
Import Android.net.Uri; 
Import Android.os.Bundle; 
Import android.app.Activity; 
Import android.content.Intent; 
Import Android.view.View; 
Import Android.view.View.OnClickListener; 
Import Android.widget.Button; 
 
Import Android.widget.EditText; public class Mainactivity extends activity {@Override protected void onCreate (Bundle savedinstancestate) {Super 
  . OnCreate (Savedinstancestate); 
   
  Setcontentview (R.layout.activity_main); 
  Click on the button to listen for//1. Get the button object buttons bt = (Button) Findviewbyid (r.id.bt_call);//button class is a subclass of view. 
 2. Set listening Bt.setonclicklistener (new MyListener ()); Class MyListener implements onclicklistener{//button is clicked, this method calls @Override public void OnClick (View v) {/ 
   /Get the user input number edittext et = (edittext) Findviewbyid (R.id.et_phone); 
    
   String phone = Et.gettext (). toString (); 
   We need to tell the system our actions: I want to call//Create Intent object Intent Intent = new Intent (); Encapsulate the call action Action_call to the intent object IntenT.setaction (Intent.action_call); Set Who to call Intent.setdata (Uri.parse ("Tel:" + phone));//This Tel: must be added, means I have to call. 
   Otherwise there will be no call function, because in the call list file set up the "Protocol"//action to tell the system, start the system call function. 
  StartActivity (Intent);  } 
   
 } 
  
}

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