how to put password screen lock to android phone programatically using my app

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I used the below code to put password screen lock...but when the activity is called my app gets crash.. Do i need to add any permissions in android manifest?? How do i go about this..

public class LockDevice extends Activity{

public static DevicePolicyManager  devicePolicyManager;
@Override
protected void onCreate(Bundle savedInstanceState) {
    // TODO Auto-generated method stub
    super.onCreate(savedInstanceState);

    System.out.println("hello");

     DevicePolicyManager devicePolicyManager =(DevicePolicyManager)getApplicationContext().getSystemService(Context.DEVICE_POLICY_SERVICE);
        ComponentName demoDeviceAdmin =new ComponentName(this, LockDevice.class);

        devicePolicyManager.setPasswordQuality(demoDeviceAdmin,DevicePolicyManager.PASSWORD_QUALITY_UNSPECIFIED);
        devicePolicyManager.setPasswordMinimumLength(demoDeviceAdmin, 5);

        boolean result = devicePolicyManager.resetPassword("123456", DevicePolicyManager.RESET_PASSWORD_REQUIRE_ENTRY);

        Toast.makeText(this, "button_lock_password_device..."+result,  Toast.LENGTH_LONG).show();   
}

}

asked 35 secs ago

userb

1

how to put password screen lock to android phone programatically using my app