检查文件存在于Android上的SD卡 [英] Check if file exists on SD card on Android

问题描述

我要检查，如果一个文本文件存在SD卡上。文件名是mytextfile.txt。下面是code：

I want to check if a text file exists on the SD card. The file name is mytextfile.txt. Below is the code:

FileOutputStream fos = openFileOutput("sdcard/mytextfile.txt", MODE_WORLD_WRITEABLE);

如何检查文件是否存在？

How can I check whether this file exists?

推荐答案

这应该可以解决问题，我已经更换了硬codeD SD卡参照推荐的API调用<一href="http://developer.android.com/reference/android/content/Context.html#getExternalCacheDir%28%29">getExternalCacheDir():

This should do the trick, I've replaced the hard coded SDcard reference to the recommended API call getExternalCacheDir():

File file = new File(getExternalCacheDir(), "mytextfile.txt" );
if (file.exists()) {
  //Do action
}

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