Easy to achieve Android lock screen function _android

The lock screen requires the introduction of a device Super administrator. Detailed instructions are available in the administration of the document's Android development documentation. Android Device management system features and control access.

There are several main steps:

1 Create broadcast receivers, implement Deviceadminreceiver

Package com.andy.lockscreen; 
 
Import Android.app.admin.DeviceAdminReceiver; 
 
/** 
 * @author zhang,tianyou 
 * @version November 20, 2014 afternoon 9:51:42 
 * 
 * Special broadcast recipient receive Administrator privileges broadcast 
 
/public Class MyAdmin extends deviceadminreceiver{ 
 
} 

2 Register the broadcast in the manifest file (different normal broadcasts are in the descriptive format):

<?xml version= "1.0" encoding= "Utf-8"?> <manifest xmlns:android= "http://schemas.android.com/apk/res/" 
    Android "package=" Com.andy.lockscreen "android:versioncode=" 1 "android:versionname=" 1.0 "> <uses-sdk android:minsdkversion= "8" android:targetsdkversion= "/> <application android:allowbackup=" true "Android:icon=" @drawable/ic_launcher "android:label=" @string/app_name "android:theme=" @style/apptheme " 
    ; <activity android:name= ". Mainactivity "android:label=" @string/app_name "> <intent-filter> <action android:name=" Android.intent.action.MAIN "/> <category android:name=" Android.intent.category.LAUNCHER "/>" ;/intent-filter> </activity> <receiver android:name= ". MyAdmin "android:description=" @string/sample_device_admin_description "android:label=" @string/sample_device_ Admin "android:permission= "Android.permission.BIND_DEVICE_ADMIN" > <meta-data android:name= "android.app.device_admin" Android:resource= "@xml/device_admin_sample"/> <intent-filter> <action android:name= "Android.app.action.DEVICE_ADMIN_ENABLED"/> </intent-filter> </receiver> &LT;/APPLICATION&G 
 
T 
 </manifest>

3 Create an XML folder under Res, create the corresponding XML file Device_admin_sample.xml

<device-admin xmlns:android= "Http://schemas.android.com/apk/res/android" > 
 <uses-policies> 
  <limit-password/> 
  <watch-login/> <reset-password/> <force-lock/> 
  < Wipe-data/> 
  <expire-password/> 
  <encrypted-storage 
 /> <disable-camera/> </uses-policies> 
</device-admin> 

4 under the values file String.xml add

<string name= "sample_device_admin_description" > User admin description information </string> 
<string name= "Sample_ Device_admin > Set Administrative Permissions </string> 

5 Interface Files:

<relativelayout 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 "Android:paddi" ngbottom= "@dimen/activity_vertical_margin" android:paddingleft= "@dimen/activity_horizontal_margin" Android: paddingright= "@dimen/activity_horizontal_margin" android:paddingtop= "@dimen/activity_vertical_margin" tools: context= "Com.andy.lockscreen.MainActivity" > <button android:onclick= "openadmin" Android:layout_alig Nparenttop= "true" android:layout_width= "wrap_content" android:layout_height= wrap_content "android:text=" open Administrator rights "/> <button android:onclick=" Lockcreen "android:layout_centerinparent=" true "Android:lay Out_width= "Wrap_content" android:layout_height= "wrap_content" android:text= "one-click Lock Screen"/> <button and roid:onclick= "Uninstall" Android:layout_alignparentbottoM= "true" android:layout_width= "Wrap_content" android:layout_height= "wrap_content" android:text= "Uninstall lock screen"/>  </RelativeLayout>

6 to achieve the lock screen and open device Administrator permissions, uninstall file

Package com.andy.lockscreen; 
Import android.app.Activity; 
Import Android.app.admin.DevicePolicyManager; 
Import Android.content.ComponentName; 
Import android.content.Intent; 
Import Android.net.Uri; 
Import Android.os.Bundle; 
Import Android.view.View; 
 
Import Android.widget.Toast; 
 
  public class Mainactivity extends activity {/** * Device Policy Service * * Private Devicepolicymanager DPM; @Override protected void OnCreate (Bundle savedinstancestate) {//TODO auto-generated method stub Super.oncre 
    Ate (savedinstancestate); 
    Setcontentview (R.layout.activity_main); 
  DPM = (Devicepolicymanager) getsystemservice (Device_policy_service); /** * Lock Screen * * @param view/public void Lockcreen (view view) {componentname who = new Comp 
    Onentname (this, myadmin.class); 
      Determine if administrator permissions are turned on if (Dpm.isadminactive (WHO)) {//Lock screen Dpm.locknow (); 
 
      Set screen password The first one is the password the second one is the additional parameter Dpm.resetpassword ("123", 0);Clear Data//wipe_external_storage clear SDcard Data//0 Restore factory settings//dpm.wipedata (devicepolicymanager.wipe_exte 
    Rnal_storage); else {//If the prompt is Toast.maketext (mainactivity.this, "Please turn on admin rights First!", Toast.length_short). Show () 
    ;  }/** * Code open Admin Permissions * * @param view/public void openadmin (view view) {//Create a intent 
    Add Device Administrator Intent Intent = new Intent (devicepolicymanager.action_add_device_admin); 
 
    Activating MyAdmin broadcast receives componentname who = new ComponentName (this, myadmin.class); 
    Intent.putextra (Devicepolicymanager.extra_device_admin, WHO); 
    Describes the benefits of user-initiated administrator rights Intent.putextra (Devicepolicymanager.extra_add_explanation, "Open can be a key lock screen, prevent not touch"); 
     
    StartActivity (Intent); 
  Toast.maketext (mainactivity.this, "Administrator rights are open!", Toast.length_short). Show (); /** * Uninstall current software device Management data special application so cannot be normal uninstall/public void uninstall (view view) {//1. Clear Administrator Permissions First compo Nentname WHo = new ComponentName (this, myadmin.class); 
 
    Dpm.removeactiveadmin (WHO); 2. 
    General application of uninstall Intent Intent = new Intent (); 
    Intent.setaction ("Android.intent.action.VIEW"); 
    Intent.addcategory ("Android.intent.category.DEFAULT"); 
    Intent.setdata (Uri.parse ("Package:" +getpackagename ())); 
 
  StartActivity (Intent);  } 
 
}

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