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Android Studio Code for Lock Screen

Pre-requisites: Eclipse IDE, Android SDK

Step 1: Create Android project

Launch Eclipse IDE and create a new Android application project called AndroidLockScreenDemo with package name com.example

Step 2: Create Activity class

Create a new Activity class called MyLockScreenActivity within the above package and add the following code!

MyLockScreenActivity.java

package com.example;   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; import android.view.View; import android.view.View.OnClickListener; import android.widget.Button; import android.widget.Toast;   public class MyLockScreenActivity extends Activity implements OnClickListener {       private static final int ADMIN_INTENT = 15;     private static final String description = "Sample Administrator description";     private DevicePolicyManager mDevicePolicyManager;     private ComponentName mComponentName;        @Override     protected void onCreate(Bundle savedInstanceState) {         super.onCreate(savedInstanceState);         setContentView(R.layout.activity_lock);         mDevicePolicyManager = (DevicePolicyManager)getSystemService(                  Context.DEVICE_POLICY_SERVICE);          mComponentName = new ComponentName(this, MyAdminReceiver.class);          Button btnEnableAdmin = (Button) findViewById(R.id.btnEnable);         Button btnDisableAdmin = (Button) findViewById(R.id.btnDisable);         Button btnLock = (Button) findViewById(R.id.btnLock);         btnEnableAdmin.setOnClickListener(this);         btnDisableAdmin.setOnClickListener(this);         btnLock.setOnClickListener(this);     }       @Override     public void onClick(View v) {         switch (v.getId()) {         case R.id.btnEnable:             Intent intent = new Intent(DevicePolicyManager.ACTION_ADD_DEVICE_ADMIN);             intent.putExtra(DevicePolicyManager.EXTRA_DEVICE_ADMIN, mComponentName);             intent.putExtra(DevicePolicyManager.EXTRA_ADD_EXPLANATION,description);             startActivityForResult(intent, ADMIN_INTENT);             break;           case R.id.btnDisable:             mDevicePolicyManager.removeActiveAdmin(mComponentName);              Toast.makeText(getApplicationContext(), "Admin registration removed", Toast.LENGTH_SHORT).show();             break;           case R.id.btnLock:             boolean isAdmin = mDevicePolicyManager.isAdminActive(mComponentName);              if (isAdmin) {                  mDevicePolicyManager.lockNow();              }else{                 Toast.makeText(getApplicationContext(), "Not Registered as admin", Toast.LENGTH_SHORT).show();             }             break;         }     }       @Override     protected void onActivityResult(int requestCode, int resultCode, Intent data) {         if (requestCode == ADMIN_INTENT) {             if (resultCode == RESULT_OK) {                 Toast.makeText(getApplicationContext(), "Registered As Admin", Toast.LENGTH_SHORT).show();             }else{                 Toast.makeText(getApplicationContext(), "Failed to register as Admin", Toast.LENGTH_SHORT).show();             }         }     }   }

activity_lock.xml

<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"     tools:context=".MyLockScreenActivity">       <TextView         android:id="@+id/txt1"         android:layout_width="wrap_content"         android:layout_height="wrap_content"         android:text="@string/hello_world"/>       <Button         android:id="@+id/btnEnable"         android:layout_width="wrap_content"         android:layout_height="wrap_content"         android:text="Enable"         android:layout_below="@+id/txt1"/>       <Button         android:id="@+id/btnDisable"         android:layout_width="wrap_content"         android:layout_height="wrap_content"         android:text="Disable"         android:layout_below="@+id/btnEnable"/>       <Button         android:id="@+id/btnLock"         android:layout_width="wrap_content"         android:layout_height="wrap_content"         android:text="Lock"         android:layout_below="@+id/btnDisable"/>   </RelativeLayout>

Step 3: Add lock policy and create receiver

Create a new folder called xml inside the project and add an XML file for exercising admin rights called admin.xml containing the following code!

<device-admin xmlns:android="http://schemas.android.com/apk/res/android" >     <uses-policies>         <force-lock />     </uses-policies> </device-admin>

You also need to create an empty Receiver class that will extend the DeviceAdminReceiver. I am going to name my class as MyAdminReceiver.

MyAdminReceiver.java

package com.example;   import android.app.admin.DeviceAdminReceiver;   public class MyAdminReceiver extends DeviceAdminReceiver{   }

In this case, one needs to update the AndroidManifest.xml file and add the Receiver entry as follows!

<?xml version="1.0" encoding="utf-8"?> <manifest xmlns:android="http://schemas.android.com/apk/res/android"     package="com.example"     android:versionCode="1"     android:versionName="1.0" >       <uses-sdk         android:minSdkVersion="8"         android:targetSdkVersion="18" />       <application         android:allowBackup="true"         android:icon="@drawable/ic_launcher"         android:label="@string/app_name"         android:theme="@style/AppTheme" >         <activity             android:name="com.example.MyLockScreenActivity"             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="MyAdminReceiver"             android:permission="android.permission.BIND_DEVICE_ADMIN">             <meta-data                 android:name="android.app.device_admin"                 android:resource="@xml/admin"/>               <intent-filter>                 <action android:name="android.app.action.DEVICE_ADMIN_ENABLED" />             </intent-filter>         </receiver>               </application>   </manifest>

Save all changes and make sure no errors are present. Finally, run the application on an Android device and you should now be able to lock your screen through code!