1.对话框

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方式一

    // 1.创建AlertDialog
     AlertDialog dialog = new AlertDialog.Builder(MainActivityAlert.this).create();
// 2.设置title
                dialog.setTitle("提示ℹ2");
//3.设置内容
                dialog.setMessage("确定吗？");
//设置确定按钮和监听函数
                dialog.setButton(DialogInterface.BUTTON_POSITIVE, "确定", new DialogInterface.OnClickListener() {
                    @Override
                    public void onClick(DialogInterface dialog, int which) {

                    }
                });
//4. 显示
                dialog.show();

方式二

// 1.创建 AlertDialog.Builder
 AlertDialog.Builder builder = new AlertDialog.Builder(MainActivityAlert.this);
 // 2.构建对话框
                builder.setTitle("提示"); //title
                builder.setMessage("你确定吗？"); //内容
//3.构建确定按钮和监听汗水
                builder.setPositiveButton("确定", new DialogInterface.OnClickListener() {
                    @Override
                    public void onClick(DialogInterface dialog, int which) {
                        finish();
                    }
                });
//4.构建取消按钮
                builder.setNegativeButton("取消",null);
                builder.show();

2.popupwindow

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 // 设置PopupWindow
    public void showPopupWindow(View view){
        // 1.实例化对象
        View v = LayoutInflater.from(this).inflate(R.layout.popup_window_xml,null);
        // 参数1：用在弹出中的view // 2,3参数就是弹出框的宽高 // 4,能否获取焦点
        PopupWindow popupWindow = new PopupWindow(v,600,240,true);
        // 2.设置（背景，动画）
        //2.1设置背景
        popupWindow.setBackgroundDrawable(new ColorDrawable(Color.TRANSPARENT));
        // 设置能相应外部的点击事件
        popupWindow.setOutsideTouchable(true);
        // 设置能相应点击事件
        popupWindow.setTouchable(true);
        // 3.显示 显示到哪里 ,参数2，3（x,y 偏移量）
        popupWindow.showAsDropDown(view,50,50);
    }

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3.ArrayAdapter 数组适配器，前端 select

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 private void showArrayDialog() {
        final  String[] item = {"java","mysql","C","java1","mysql1","C1","java2","mysql2","C2"};
        // 数组适配器
        // 参数1 环境 参数2：布局资源索引（每一项资源程序的样式）参数3：数据源
        ArrayAdapter adapter = new ArrayAdapter(this, android.R.layout.simple_dropdown_item_1line,item);
        AlertDialog.Builder builder = new AlertDialog.Builder(this);
        builder.setTitle("请选择");
        // adapter 显示 和点击某一项事件监听
        builder.setAdapter(adapter, new DialogInterface.OnClickListener() {
            @Override
            public void onClick(DialogInterface dialog, int index) {
                // 打印当前点击的某一项
                Toast.makeText(MainActivityPopup.this,item[index],Toast.LENGTH_LONG).show();
                dialog.dismiss(); // 让当前对话框消失
            }
        });
        builder.show();
    }