中级控件——对话框——提醒对话框AlertDialog

╰+哭是因爲堅強的太久メ 2023-09-28 14:30 3阅读 0赞

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package com.example.myapplication;
    
    import android.content.DialogInterface;
    import android.support.v7.app.AlertDialog;
    import android.support.v7.app.AppCompatActivity;
    import android.os.Bundle;
    import android.view.View;
    import android.widget.TextView;
    
    public class MainActivity extends AppCompatActivity implements View.OnClickListener
    {
        private TextView tv_alert; // 声明一个文本视图对象
    
        @Override
        protected void onCreate(Bundle savedInstanceState)
        {
            super.onCreate(savedInstanceState);
            setContentView(R.layout.activity_main);
    
    
            // 给btn_alert设置点击监听器，一旦用户点击按钮，就触发监听器的onClick方法
            findViewById(R.id.btn_alert).setOnClickListener(this);
    
            // 从布局文件中获取名叫tv_alert的文本视图
            tv_alert = findViewById(R.id.tv_alert);
        }
    
        @Override
        public void onClick(View v)
        {
            if (v.getId() == R.id.btn_alert)
            {
                // 创建提醒对话框的建造器
                AlertDialog.Builder builder = new AlertDialog.Builder(this);
                builder.setTitle("尊敬的用户"); // 设置对话框的标题文本
                builder.setMessage("你真的要卸载我吗？"); // 设置对话框的内容文本
    
                // 设置对话框的肯定按钮文本及其点击监听器
                builder.setPositiveButton("残忍卸载", new DialogInterface.OnClickListener() {
                    @Override
                    public void onClick(DialogInterface dialog, int which) {
                        tv_alert.setText("虽然依依不舍，但是只能离开了");
                    }
                });
    
                // 设置对话框的否定按钮文本及其点击监听器
                builder.setNegativeButton("我再想想", new DialogInterface.OnClickListener() {
                    @Override
                    public void onClick(DialogInterface dialog, int which) {
                        tv_alert.setText("让我再陪你三百六十五个日夜");
                    }
                });
    
                AlertDialog alert = builder.create(); // 根据建造器构建提醒对话框对象
    
                alert.show(); // 显示提醒对话框
            }
        }
    
    }

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