AS之AlertDialog使用

关于AlertDialog的使用，主要是去做一个弹窗。

import android.content.DialogInterface;
import android.os.Bundle;
import android.view.Menu;
import android.view.View;
import android.widget.Button;
import android.widget.Toast;
 
import androidx.annotation.Nullable;
import androidx.appcompat.app.AlertDialog;
import androidx.appcompat.app.AppCompatActivity;
 
public class LayoutActivity extends AppCompatActivity implements View.OnClickListener{
    @Override
    protected void onCreate(@Nullable Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.layout);
        Button btn_alert=findViewById(R.id.btn_alert);
        btn_alert.setOnClickListener(this);
    }
    @Override
    public void onClick(View v) {
        AlertDialog.Builder builder=new AlertDialog.Builder(this);
        builder.setTitle("").setIcon(R.mipmap.ic_launcher).setMessage("要更新新版本吗？")
        .setPositiveButton("好的", new DialogInterface.OnClickListener() {
            @Override
            public void onClick(DialogInterface dialog, int which) {
                Toast.makeText(LayoutActivity.this, "系统正在更新...", Toast.LENGTH_SHORT).show();
            }
        }).setNegativeButton("不用了，谢谢", new DialogInterface.OnClickListener() {
            @Override
            public void onClick(DialogInterface dialog, int which) {
                Toast.makeText(LayoutActivity.this, "您已取消更新...", Toast.LENGTH_SHORT).show();
            }
        });
        AlertDialog ad=builder.create();
        ad.show();
    }
}