最简单的电话拨打程序

 

1.因为应用要使用手机的电话服务，所以要在清单文件AndroidManifest.xml中添加电话服务权限
 <uses-permission android:name="android.permission.CALL_PHONE"/>

2.在界面中button的onClick事件的代码：

  EditText text = (EditText)findViewById(R.id.mobile);
    String mobile=text.getText().toString();//取得号码
     
    Intent intent = new Intent(Intent.ACTION_CALL, Uri.parse("tel:"+mobile));
     startActivity(intent);//这句与XXXX.this.startActivity(intent)等价

拓展知识：
1.其中//"android.intent.action.CALL"等价于Intent.ACTION_CALL
因为在android代码ACTION_CALL里面装的是"android.intent.action.CALL"这个字符串
常用Action动作：
 ACTION_CALL               activity     Initiate a phone call. 
 ACTION_EDIT                activity    Display data for the user to edit. 
 ACTION_MAIN          activity    Start up as the initial activity of a task, with no data input and no returned output. 
 ACTION_SYNC          activity    Synchronize data on a server with data on the mobile device. 
 ACTION_BATTERY_LOW        broadcast receiver   A warning that the battery is low. 
 ACTION_HEADSET_PLUG       broadcast receiver   A headset has been plugged into the device, or unplugged from it. 
 ACTION_SCREEN_ON          broadcast receiver   The screen has been turned on. 
 ACTION_TIMEZONE_CHANGED   broadcast receiver   The setting for the time zone has changed. 
 
2 Intent的构造函数：
 1）.Intent() //用到过
 Create an empty intent.
 2）.Intent(Intent o)
 Copy constructor.
 3).Intent(String action)
 Create an intent with a given action.
 4).Intent(String action, Uri uri) //用到过
 Create an intent with a given action and for a given data url.
 5). Intent(Context packageContext, Class<?> cls) //用到过
 Create an intent for a specific component.
 6). Intent(String action, Uri uri, Context packageContext, Class<?> cls)
 Create an intent for a specific component with a specified action and data.

3.static Uri  parse(String uriString) 这个函数在android.net.Uri里面，是一个静态方法
Creates a Uri which parses the given encoded URI string.