Question

我有一个带有EditText输入字段的对话窗口。我想多次使用输入值，但希望尽可能减少代码。目前我必须为每次按钮点击设置我的alertdialogBuilder新功能，但这不是很灵活。

我将该代码用于我的alertDialogBuilder

[0]   ==> API Server now listening on PORT 5000!
[1] Starting the development server...
[1]
[1] Compiled successfully!
[1]
[1] You can now view chat app in the browser.
[1]
[1]   Local:            http://localhost:3000/
[1]   On Your Network:  http://192.168.1.118:3000/
[1]
[1] Note that the development build is not optimized.
[1] To create a production build, use yarn build.

我如何设置我的类或函数，以便我可以创建一个函数，我可以用点添加更多函数

：public static void makeEditTextInputDialog(String caption, final Context mContext){ LayoutInflater inflater = LayoutInflater.from(mContext); View inputDialogView = inflater.inflate(R.layout.dialog_input_edittext, null); AlertDialog.Builder builder = new AlertDialog.Builder(mContext); builder.setView(inputDialogView); final EditText etInput = (EditText) inputDialogView.findViewById(R.id.et_inputdialog); final TextView tvCaption = (TextView) inputDialogView.findViewById(R.id.tv_inputdialog_caption); tvCaption.setText(caption); builder .setCancelable(true) .setPositiveButton(R.string.apply, new DialogInterface.OnClickListener() { @Override public void onClick(DialogInterface dialog, int which) { } }).setNegativeButton(R.string.cancel, new DialogInterface.OnClickListener() { @Override public void onClick(DialogInterface dialog, int which) { dialog.cancel(); } }); AlertDialog alertDialog = builder.create(); alertDialog.show(); }

Answer 1

您应该能够通过使每个方法返回this作为您正在创建的Builder类的实例来实现此目的。这样您就可以将呼叫与＆＃39;。＆＃39;

链接在一起

这是一个简单的例子：

class MessageBuilder {
    String address = "unknown";
    String state = "unknown";
    String country = "unknown";

    MessageBuilder() {}


    String show() {
        return address + ", " + state + ", " + country;
    }

    MessageBuilder setAddress(String address) {
        this.address = address;
        return this;
    }

    MessageBuilder setState(String state) {
        this.state = state;
        return this;
    }

    MessageBuilder setCountry(String country) {
        this.country = country;
        return this;
    }
}

通过将set方法链接在一起来使用它：

    MessageBuilder builder = new MessageBuilder();
    String msg = builder.setState("CA").setAddress("123 Main St.").show();
    Log.d("MessageBuilder", msg);

...在日志中产生这个：

09-24 14:25:16.254 {...}  D/MessageBuilder: 123 Main St., CA, unknown

如何在一个命令中添加多个功能？

1 个答案: