我一直试图做锁定任务模式或锁定到我的应用程序，而不能访问其他应用程序仍然能够禁用该功能。我看过教程和文档，但有些方法是在大约5年前（onActivityResult）制作的，所以不推荐使用。我已经尝试更改为我发现的新方法（registerForActivityResult），但是当我启动我的应用程序并尝试通过点击启用按钮来启用管理员权限时，管理员权限不会弹出，所以我无法检查它。所以，当我试图从其他应用程序锁定我的手机什么也没发生，因为我没有管理员权限.我的代码MainActivity.class如下：

package com.example.myapplication;

import android.app.Activity;
import android.app.ActivityManager;
import android.app.ActivityOptions;
import android.app.admin.DevicePolicyManager;
import android.content.ComponentName;
import android.content.Context;
import android.content.Intent;
import android.content.pm.PackageManager;
import android.os.Bundle;
import android.util.Log;
import android.view.View;
import android.widget.Button;
import android.widget.TextView;

import androidx.activity.result.ActivityResult;
import androidx.activity.result.ActivityResultCallback;
import androidx.activity.result.ActivityResultLauncher;
import androidx.activity.result.contract.ActivityResultContracts;
import androidx.appcompat.app.AppCompatActivity;

import androidx.navigation.NavController;
import androidx.navigation.Navigation;
import androidx.navigation.ui.AppBarConfiguration;
import androidx.navigation.ui.NavigationUI;

import com.example.myapplication.databinding.ActivityMainBinding;

import android.view.Menu;
import android.view.MenuItem;
import android.widget.Toast;

import com.example.myapplication.helper.MqttHelper;
import org.eclipse.paho.client.mqttv3.IMqttDeliveryToken;
import org.eclipse.paho.client.mqttv3.MqttCallbackExtended;
import org.eclipse.paho.client.mqttv3.MqttMessage;

public class MainActivity extends AppCompatActivity implements View.OnClickListener{

    private Button lock, disable, enable;
    private static final int RESULT_ENABLE = 11;
    private DevicePolicyManager devicePolicyManager;
    private ActivityManager activityManager;
    private ComponentName componentName;

    private AppBarConfiguration appBarConfiguration;
    private ActivityMainBinding binding;
    MqttHelper mqttHelper;
    //ChartHelper mChart;
    //LineChart chart;

    TextView dataReceived;
    private Button btnPublish;

    // Allowlist two apps.
    private static final String KIOSK_PACKAGE = "com.example.myapplication";
    private static final String[] APP_PACKAGES = {KIOSK_PACKAGE};

// ...

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);

        binding = ActivityMainBinding.inflate(getLayoutInflater());
        setContentView(binding.getRoot());

        //setContentView(R.layout.activity_main);
        devicePolicyManager = (DevicePolicyManager) getSystemService(DEVICE_POLICY_SERVICE);
        activityManager = (ActivityManager) getSystemService(ACTIVITY_SERVICE);
        componentName = new ComponentName(this, Controller.class);

        lock = (Button) findViewById(R.id.lock);
        enable = (Button) findViewById(R.id.enable);
        disable = (Button) findViewById(R.id.disable);
        lock.setOnClickListener(this);
        enable.setOnClickListener(this);
        disable.setOnClickListener(this);

       
        
        dataReceived = (TextView) findViewById(R.id.textview_first);
        startMqtt();
    }



    @Override
    protected void onResume() {
        super.onResume();
        boolean isActive = devicePolicyManager.isAdminActive(componentName);
    }

    @Override
    public void onClick(View view) {
        if (view == lock) {
            boolean active = devicePolicyManager.isAdminActive(componentName);
            if(active) {
                devicePolicyManager.lockNow();
            } else {
                Toast.makeText(this, "You need to enable the Admin Device Features", Toast.LENGTH_SHORT).show();
            }
        } else if (view == enable) {
            Intent intent = new Intent(DevicePolicyManager.ACTION_ADD_DEVICE_ADMIN);
            intent.putExtra(DevicePolicyManager.EXTRA_DEVICE_ADMIN, componentName);
            intent.putExtra(DevicePolicyManager.EXTRA_ADD_EXPLANATION,"You Should Enable the app!");
            //someActivityResultLauncher.launch(intent);
            // Caller
            mGetContent.launch(intent);
            // Receiver

            //startActivityForResult(intent, RESULT_ENABLE);
        } else if (view == disable) {
            devicePolicyManager.removeActiveAdmin(componentName);
            disable.setVisibility(View.GONE);
            enable.setVisibility(View.VISIBLE);
        }

    }

    ActivityResultLauncher<Intent> mGetContent = registerForActivityResult(
            new ActivityResultContracts.StartActivityForResult(),
            new ActivityResultCallback<ActivityResult>() {
                @Override
                public void onActivityResult(ActivityResult result) {
                    if (result.getResultCode() == Activity.RESULT_OK) {
                        // Here, no request code
                        Intent data = result.getData();

                        Toast.makeText(MainActivity.this, "enabled", Toast.LENGTH_SHORT).show();
                    }else{
                        Toast.makeText(MainActivity.this, "Failed", Toast.LENGTH_SHORT).show();
                    }
                }
            });

    @Override
    protected void onActivityResult(int requestCode, int resultCode, Intent data) {

                if(resultCode== Activity.RESULT_OK  && requestCode == RESULT_ENABLE){
                    Toast.makeText(MainActivity.this, "enabled", Toast.LENGTH_SHORT).show();
                }else {
                    Toast.makeText(MainActivity.this, "Failed", Toast.LENGTH_SHORT).show();
                }

        super.onActivityResult(requestCode, resultCode, data);
    }

    /*@Override
    protected void onActivityResult(int requestCode, int resultCode, Intent data) {

        switch (requestCode){
            case RESULT_ENABLE:
                if(resultCode== Activity.RESULT_OK ){
                    //btn_unblock.setText("Dissable");
                    //btn_block.setVisibility(View.VISIBLE);
                    Toast.makeText(MainActivity.this, "enabled", Toast.LENGTH_SHORT).show();
                }else{
                    Toast.makeText(MainActivity.this, "Failed", Toast.LENGTH_SHORT).show();
                }
                break;
        }

        super.onActivityResult(requestCode, resultCode, data);
    }*/

    @Override
    public boolean onCreateOptionsMenu(Menu menu) {
        // Inflate the menu; this adds items to the action bar if it is present.
        getMenuInflater().inflate(R.menu.menu_main, menu);
        return true;
    }

    @Override
    public boolean onOptionsItemSelected(MenuItem item) {
        // Handle action bar item clicks here. The action bar will
        // automatically handle clicks on the Home/Up button, so long
        // as you specify a parent activity in AndroidManifest.xml.
        int id = item.getItemId();

        //noinspection SimplifiableIfStatement
        if (id == R.id.action_settings) {
            return true;
        }

        return super.onOptionsItemSelected(item);
    }

    @Override
    public boolean onSupportNavigateUp() {
        NavController navController = Navigation.findNavController(this, R.id.nav_host_fragment);
        return NavigationUI.navigateUp(navController, appBarConfiguration)
                || super.onSupportNavigateUp();
    }


    // MQTT Code

    private void startMqtt(){
        mqttHelper = new MqttHelper(getApplicationContext());
        mqttHelper.mqttAndroidClient.setCallback(new MqttCallbackExtended() {
            @Override
            public void connectComplete(boolean b, String s) {
                Log.w("Debug","Connected");
            }

            @Override
            public void connectionLost(Throwable throwable) {

            }

            @Override
            public void messageArrived(String topic, MqttMessage mqttMessage) throws Exception {
                Log.w("Debug",mqttMessage.toString());
                dataReceived.setText(mqttMessage.toString());
                //mChart.addEntry(Float.valueOf(mqttMessage.toString()));
            }

            @Override
            public void deliveryComplete(IMqttDeliveryToken iMqttDeliveryToken) {

            }
        });
    }
}