Feature del #1178
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Feature del #1178
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问题解决
首先我查找了查找删除按钮的相关代码，确定了要改动的代码文件，包括布局文件（res/layout/activity_main.xml 以及 activity_preview.xml）和对应的每个界面的Activity文件（java/swati4star/createpdf/activity）。然后，在布局文件中找到删除按钮：在activity_main.xml和activity_preview.xml中，找到定义删除按钮的代码，并为按钮添加一个唯一的id。接着我在各个界面的Activity文件中，修改删除按钮的点击事件，找到设置删除按钮点击事件的原代码，在点击删除按钮之前，添加一个检查条件，确认是否有PDF已经创建。如果没有PDF存在，则禁用按钮或弹出提示。接下来，我实现checkIfPdfCreated()，即检查是否有PDF已经被创建（数据库查询操作）。最后一次迭代是改进了对应UI，在创建和删除PDF的地方调用 deleteButton.setEnabled( true or false)，确保UI在状态改变时刷新，如果删除按钮的状态依赖于PDF的创建状态，那么在创建或删除PDF后，确保按钮状态能够动态更新。