You have to make your app as admin, Read something over here
Create a new empty project and create a class called MyAdminReceiver
that extends DeviceAdminReceiver
like this
import android.app.admin.DeviceAdminReceiver;
public class MyAdminReceiver extends DeviceAdminReceiver{
}
Create a new folder called xml and create an .xml file for your admin rights called admin.xml
and add the policies, in you case its locking the screen
<device-admin xmlns:android="http://schemas.android.com/apk/res/android" >
<uses-policies>
<force-lock />
</uses-policies>
</device-admin>
In your manifest add the receiver under Application tag
<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>
And in your MainActivity.java
add code like this
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 MainActivity extends Activity implements OnClickListener {
private static final int ADMIN_INTENT = 15;
private static final String description = "Some Description About Your Admin";
private DevicePolicyManager mDevicePolicyManager;
private ComponentName mComponentName;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
mDevicePolicyManager = (DevicePolicyManager)getSystemService(
Context.DEVICE_POLICY_SERVICE);
mComponentName = new ComponentName(this, MyAdminReceiver.class);
Button btnEnableAdmin = (Button) findViewById(R.id.btnEnableAdmin);
Button btnDisableAdmin = (Button) findViewById(R.id.btnDisableAdmin);
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.btnEnableAdmin:
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.btnDisableAdmin:
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();
}
}
}
}
Note: If you try to call the Intent for Admin Device other that from an Activity subclass there are chances you might get an error to use Intent.FLAG_ACTIVITY_NEW_TASK
but when you use that your window might not pop like in your case so Try opening it from a subclass of an activity only
Also you cannot un-install your app unless it has not be unregistered as an admin
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