Java Android 开发切换 TextView 可见性
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Android development toggling TextView visibility
提问by Yuval
Im having some trouble with setting textview to invisible/visible.
我在将 textview 设置为不可见/可见时遇到了一些麻烦。
basicly i want this to happen when an on/off button has been clicked.
基本上我希望在单击开/关按钮时发生这种情况。
what i did is kind of like
我所做的有点像
textview.setVisibility(TextView.VISIBLE);
textview.setVisibility(TextView.INVISIBLE);
when i try executing this the emultor says that the app has stopped unexcpetedly
当我尝试执行此操作时，模拟器说该应用程序已意外停止
采纳答案by Ethan
Are you building this from XML or programmatically?
您是从 XML 还是以编程方式构建它？
I would make it with an XML file then when the Activity runs change the property. Be sure to use setContentView(R.layout.main);before you try to get the TextView with findViewById(...).
我会用一个 XML 文件制作它，然后当 Activity 运行时更改属性。setContentView(R.layout.main);在尝试使用.TextView 获取 TextView 之前，请务必使用findViewById(...)。
Call .setVisibility(View.GONE);on the TextView to hide it.
调用.setVisibility(View.GONE);TextView 以隐藏它。
Call .setVisibility(View.VISIBLE);to on the TextView to show it.
.setVisibility(View.VISIBLE);在 TextView 上调用to 以显示它。
I have an example that does something like this. You can see the code here: https://github.com/ethankhall/Morse-Messenger/blob/master/src/com/kopysoft/MorseMessenger/Translate.java
我有一个例子可以做这样的事情。您可以在此处查看代码：https: //github.com/ethankhall/Morse-Messenger/blob/master/src/com/kopysoft/MorseMessenger/Translate.java
回答by mibollma
Read about DDMS and logcat to obtain a stacktrace and to see what the problem is: http://developer.android.com/guide/developing/debugging/debugging-projects.html
阅读有关 DDMS 和 logcat 以获取堆栈跟踪并查看问题所在：http: //developer.android.com/guide/developing/debugging/debugging-projects.html
This is what you are looking for:
这就是你要找的：
回答by Todd Davies
Without more code or a stack trace, it's hard to say, but it sounds like you haven't initialized the text view. Here's how to do it:
没有更多代码或堆栈跟踪，这很难说，但听起来您还没有初始化文本视图。这是如何做到的：
TextView myTextView = (TextView) findViewById(R.id.tv_text);
Where 'tv_text' is the id of the textview as defined in the xml layout file.
其中 'tv_text' 是 xml 布局文件中定义的 textview 的 id。
Hope that helped!
希望有所帮助！
