如何从 Android 中的 SD 卡读取文本文件? [英] How can I read a text file from the SD card in Android?

问题描述

我是 Android 开发新手.

I am new to Android development.

我需要从 SD 卡读取文本文件并显示该文本文件.有什么办法可以直接在Android中查看文本文件，或者如何读取和显示文本文件的内容?

I need to read a text file from the SD card and display that text file. Is there any way to view a text file directly in Android or else how can I read and display the contents of a text file?

推荐答案

在你的布局中，你需要一些东西来显示文本.TextView 是显而易见的选择.所以你会有这样的事情:

In your layout you'll need something to display the text. A TextView is the obvious choice. So you'll have something like this:

<TextView 
    android:id="@+id/text_view" 
    android:layout_width="fill_parent" 
    android:layout_height="fill_parent"/>

您的代码将如下所示:

//Find the directory for the SD Card using the API
//*Don't* hardcode "/sdcard"
File sdcard = Environment.getExternalStorageDirectory();

//Get the text file
File file = new File(sdcard,"file.txt");

//Read text from file
StringBuilder text = new StringBuilder();

try {
    BufferedReader br = new BufferedReader(new FileReader(file));
    String line;

    while ((line = br.readLine()) != null) {
        text.append(line);
        text.append('
');
    }
    br.close();
}
catch (IOException e) {
    //You'll need to add proper error handling here
}

//Find the view by its id
TextView tv = (TextView)findViewById(R.id.text_view);

//Set the text
tv.setText(text);

这可以在您的 Activity 的 onCreate() 方法中，或其他地方，具体取决于您想要做什么.

This could go in the onCreate() method of your Activity, or somewhere else depending on just what it is you want to do.

这篇关于如何从 Android 中的 SD 卡读取文本文件?的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！