The method of realizing one key lock screen with Android programming _android

An example of this article describes the Android program to achieve one-click lock Screen method. Share to everyone for your reference, specific as follows:

Here are the following two classes:

Deviceadminreceiver Device Management components. This class provides an action that facilitates the interpretation of the intent emitted by the system. Your device management application must contain a deviceadminreceiver subclass. In this program, it represents a Device manager on a mobile phone.

Devicepolicymanager A class that manages the specifications on the device. Most clients must declare a deviceadminreceiver that is currently enabled by a user. This Devicepolicymanager manages these specifications for one or more deviceadminreceiver instances.

An instance of Devicepolicymanager has a method called Locknow to lock the screen directly. But before that, you need to activate the Device Manager in your program.

Here is the main class lockactivity

Package com.iceman.test; 
Import android.app.Activity; 
Import Android.app.admin.DevicePolicyManager; 
Import Android.content.ComponentName; 
Import Android.content.Context; 
Import android.content.Intent; 
Import Android.os.Bundle; 
  public class Lockactivity extends activity {private Devicepolicymanager Policymanager; 
  Private ComponentName componentname; 
    @Override public void OnCreate (Bundle savedinstancestate) {super.oncreate (savedinstancestate);  
  Setcontentview (R.layout.main); public void Lockscreen (View v) {Policymanager = (Devicepolicymanager) getsystemservice (context.device_policy_serv 
    ICE); 
    ComponentName = new ComponentName (this, lockreceiver.class); if (policymanager.isadminactive (componentname)) {//Determine whether permission (activated Device Manager) Policymanager.locknow ()//Direct lock screen Android . os. 
    Process.killprocess (Android.os.Process.myPid ()); }else{Activemanager ()//Activate Device Manager Get Permissions}//Unbind public void bind (View v) {if (componEntname!=null) {policymanager.removeactiveadmin (componentname);
   Activemanager (); @Override protected void Onresume () {//override this method to lock the screen after the first activation of Device Manager (Policymanager!=null && POLICYM 
      Anager.isadminactive (componentname)) {Policymanager.locknow (); 
    Android.os.Process.killProcess (Android.os.Process.myPid ()); 
  } super.onresume (); private void Activemanager () {///using an implicit intent to invoke the system method to activate the specified Device Manager Intent Intent = new Intent (devicepolicymanager.act 
    Ion_add_device_admin); 
    Intent.putextra (Devicepolicymanager.extra_device_admin, componentname); 
    Intent.putextra (Devicepolicymanager.extra_add_explanation, "One key lock screen"); 
  StartActivity (Intent); 

 } 
}

The following is the Device Manager class Lockreceiver, which is a class that inherits from Deviceadminreceiver, can receive activation/contact activated broadcast, take the next step, in this program, simply print the information.

Import Android.app.admin.DeviceAdminReceiver; 
Import Android.content.Context; 
Import android.content.Intent; 
The public class Lockreceiver extends deviceadminreceiver{ 
  @Override 
  the public void onreceive (context context, Intent Intent) { 
    super.onreceive (context, intent); 
    System.out.println ("Onreceiver"); 
  } 
  @Override public 
  void onenabled (context context, Intent Intent) { 
    System.out.println ("active use"); 
    Super.onenabled (context, intent); 
  } 
  @Override public 
  void ondisabled (context context, Intent Intent) { 
    System.out.println ("deactivate"); 
    Super.ondisabled (context, intent); 
  } 
 

Main configuration file:

<?xml version= "1.0" encoding= "Utf-8"?> <manifest xmlns:android= "http://schemas.android.com/apk/res/" Android "package=" Com.iceman.test "android:versioncode=" 1 "android:versionname=" 1.0 "> <uses-sdk Android : minsdkversion= "9"/> <application android:icon= "@drawable/ic_launcher" android:label= "@string/app_name "> <activity android:name=". 
      Lockactivity "android:label=" @string/app_name "Android:theme=" @android: Style/theme.translucent "> <intent-filter> <action android:name= "Android.intent.action.MAIN"/> <category android:na 
      Me= "Android.intent.category.LAUNCHER"/> </intent-filter> </activity> <receiver Android:name= ". Lockreceiver "android:description=" @string/app_name "android:label=" @string/app_name "Android:permiss ion= "Android.permission.BIND_DEVICE_ADMIN" > <meta-data android:name= "AndrOid.app.device_admin "android:resource=" @xml/lock_screen "/> <intent-filter> <action Android:name= "Android.app.action.DEVICE_ADMIN_ENABLED"/> </intent-filter> </receiver> </ 

 Application> </manifest>

Where Lock_screen is the Device Manager's permission declaration, which needs to be defined as an XML file in the Res/xml directory

<?xml version= "1.0" encoding= "UTF-8"?> <device-admin xmlns:android= 
"http://schemas.android.com/apk/" Res/android "> 
  <uses-policies> 
    <!--lock screen--> 
    <force-lock/> 
  </ Uses-policies> 
</device-admin> 

OK. Now you can also do a key lock screen. Do not have to go to the Internet to find a variety of ads with a push.

I hope this article will help you with the Android program.