文件extStore = Environment.getExternalStorageDirectory（）;
myfile文件=新的文件（extStore.getAbsolutePath（）+/book1/page2.html）;如果（myFile.exists（））{
    ...
}
 

这应该工作。

I want to check whether a given file exists in android sd card. I am trying it out with creating a file using the absolute path and checking with file.exists() but its not working. The URL for the file is "file:///mnt/sdcard/book1/page2.html" and the file does exist. But somehow file.exists() isn't showing the same.

File extStore = Environment.getExternalStorageDirectory();
File myFile = new File(extStore.getAbsolutePath() + "/book1/page2.html");

if(myFile.exists()){
    ...
}

This should work.