文本字段 - 用户开始输入文本之前显示提示 [英] TextField - show hint before user starts typing text

问题描述

我开发的BlackBerry应用程序。我想显示文本字段中的一个提示文本用户开始typing.when用户开始输入就应该消失前，当有文本字段0字符它应该显示up.Has人实现了这个了吗？那么就请大家分享。

I am developing an Blackberry application. I want to show a hint text in TextField before user starts typing.when user starts typing it should disappear and when there are 0 characters in TextField it should show up.Has anybody implemented this yet?then please share.

推荐答案

这里是涂料中的实现（）方法

here is the implementation within paint() method

String test = super.getText();
        if ( test == null || test.length() < 1 ) {
            graphics.setColor( 0x00a0a0a0 );
            graphics.drawText(hint, 0, 0);
        }

和这里的源感谢peter_strange
<一href=\"http://supportforums.blackberry.com/t5/Java-Development/Prompt-hint-place-holder-text-on-a-Numeric-Password-edit-field/m-p/990817#M151704\" rel=\"nofollow\">http://supportforums.blackberry.com/t5/Java-Development/Prompt-hint-place-holder-text-on-a-Numeric-Password-edit-field/m-p/990817#M151704

and here is the source thanks to peter_strange http://supportforums.blackberry.com/t5/Java-Development/Prompt-hint-place-holder-text-on-a-Numeric-Password-edit-field/m-p/990817#M151704

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