How to SET and UNSET lock screen password in Android programatically

Question

I want to set lock screen password programatically and then remove when the loop is executed. I have added Device Administration successfully, can someone help me to SET and UNSET lock screen password from my application itself. Below is my working code for Device Administration

public class DevicePolicyDemoActivity extends Activity {
    static final String TAG = "DevicePolicyDemoActivity";
    static final int ACTIVATION_REQUEST = 47; // identifies our request id
    DevicePolicyManager devicePolicyManager;
    ComponentName demoDeviceAdmin;

    /** Called when the activity is first created. */
    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.main);

        // Initialize Device Policy Manager service and our receiver class
        devicePolicyManager = (DevicePolicyManager) getSystemService(Context.DEVICE_POLICY_SERVICE);
        demoDeviceAdmin = new ComponentName(this, DemoDeviceAdminReceiver.class);
        Intent intent = new Intent(
                DevicePolicyManager.ACTION_ADD_DEVICE_ADMIN);
        intent.putExtra(DevicePolicyManager.EXTRA_DEVICE_ADMIN,
                demoDeviceAdmin);
        intent.putExtra(DevicePolicyManager.EXTRA_ADD_EXPLANATION,
                "Your boss told you to do this");
        startActivityForResult(intent, ACTIVATION_REQUEST);
    }
}

Answer 1

For Setting Password you can use the code below:

devicePolicyManager.setPasswordQuality(
                                   demoDeviceAdmin
                                  ,DevicePolicyManager.PASSWORD_QUALITY_UNSPECIFIED);
devicePolicyManager.setPasswordMinimumLength(
                                  demoDeviceAdmin,
                                   5);
boolean result = devicePolicyManager.resetPassword("123456",
                        DevicePolicyManager.RESET_PASSWORD_REQUIRE_ENTRY);