如何在弹出 AlertDialog 时隐藏 MainActivity？

Question

I want to hide MainActivity when AlertDialog is shown. I create new Activity and put my code in it and call it from MainActivity by using Intent .

My Code of AlertDialog :

import androidx.appcompat.app.AppCompatActivity;

import android.app.AlertDialog;
import android.content.DialogInterface;
import android.os.Bundle;

public class Dialog extends AppCompatActivity {

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        AlertDialog.Builder builder1 = new AlertDialog.Builder(Dialog.this);
        builder1.setTitle("RONQ");
        builder1.setMessage(MainActivity.mesgList.get(MainActivity.currentMsgNumber));
        builder1.setPositiveButton("ok", new DialogInterface.OnClickListener() {
            @Override
            public void onClick(DialogInterface dialog, int which) {
            }
        });
        builder1.show();

    }
}

And Intent code is:

Intent intent = new Intent();
                    intent.setClass(MainActivity.this, Dialog.class);
                    startActivity(intent);

Answer 1

You don't need Intent :

    AlertDialog.Builder builder = new AlertDialog.Builder(this);
    builder.setMessage("message")
            .setPositiveButton(getString(R.string.update), (dialogInterface, i) -> {
                                    //do something
                                }).setNegativeButton(getString(R.string.cancel), (dialogInterface, i) -> {
//do something 
    }).setCancelable(false).create().show();