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Android开发中，经常在Activity中使用getText(int resId)和getString(int resId)这两个方法，那么这两个方法有什么区别和联系呢？
这两个方法的参数都是资源ID，区别在于getText(int resId)返回的是一个CharSequence，而getString(int resId)返回的是一个String。源代码如下：
getText(int resId)：
/** * Return a localized, styled CharSequence from the application‘s package‘s * default string table. * * @param resId Resource id for the CharSequence text */ public final CharSequence getText(int resId) { return getResources().getText(resId); }
getString(int resId)：
/** * Return a localized string from the application‘s package‘s * default string table. * * @param resId Resource id for the string */ public final String getString(int resId) { return getResources().getString(resId); }
可以看到，他们在各自的内部又调用了Resources类的getText(int id)和getString(int id)方法，那么我们就再看一下Resources类中的这两个方法是怎么写的:
Resources类中的getText(int id)：
/** * Return the string value associated with a particular resource ID. The * returned object will be a String if this is a plain string; it will be * some other type of CharSequence if it is styled. * {@more} * * @param id The desired resource identifier, as generated by the aapt * tool. This integer encodes the package, type, and resource * entry. The value 0 is an invalid identifier. * * @throws NotFoundException Throws NotFoundException if the given ID does not exist. * * @return CharSequence The string data associated with the resource, plus * possibly styled text information. */ public CharSequence getText(int id) throws NotFoundException { CharSequence res = mAssets.getResourceText(id); if (res != null) { return res; } throw new NotFoundException("String resource ID #0x" + Integer.toHexString(id)); }
Resources类中的getString(int id)：
/** * Return the string value associated with a particular resource ID. It * will be stripped of any styled text information. * {@more} * * @param id The desired resource identifier, as generated by the aapt * tool. This integer encodes the package, type, and resource * entry. The value 0 is an invalid identifier. * * @throws NotFoundException Throws NotFoundException if the given ID does not exist. * * @return String The string data associated with the resource, * stripped of styled text information. */ public String getString(int id) throws NotFoundException { CharSequence res = getText(id); if (res != null) { return res.toString(); } throw new NotFoundException("String resource ID #0x" + Integer.toHexString(id)); }
看到这里我想大家就都明白了，Resources类的中getString(int id)方法其实就是调用了Resources类的getText(int id)方法后，多做了一个toString()处理，那么也就是说，我们要讨论的问题的结论就可以理解为：Context类中的getString(int resId)==getText(int resId).toString()。
更直观一点，我们来做个小demo：
首先，在Strings中定义两个string资源：
<string name="get_text"><b>getText</b></string> <string name="get_string"><b>getString</b></string>
接着，在layout文件中定义两个TextView，分别是textView1和textView2（代码省略）。
最后，分别使用getText(int resId)和getString(int resId)获取上面两个资源，并在textView1和textView2中显示：
CharSequence charSequence = getText(R.string.get_text); String str = getString(R.string.get_string); ((TextView)findViewById(R.id.textView1)).setText(charSequence); ((TextView)findViewById(R.id.textView2)).setText(str);
结果一目了然：
Android - Context中的getText(int resId)方法和getString(int resId)方法的区别
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原文地址：http://www.cnblogs.com/yin-jiawei/p/4409618.html
