Android Lab Test : Reading the foot file list (english) Video of tutorial on : https://www.youtube.com/playlist?list=PLL2Z3bzdO25yHwIV3XdMzKs61At0Ldh6L Visit http://www.AndroidLabTest.com

1. Develop on Android
Android Lab Test
www.AndroidLabTest.com
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By Bruno Delb
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Officialsite
Lesson : The list of root directories

2. The list of the root directories
• In this lesson, you will learn to use the file manager to list
the list of root files.
• For this, you will use File and listFiles.

3. The list of the root directories
• In order to know the path to the application directory, use the
method getFilesDir().
File file = this.getFilesDir();
• In order to know the absolute path to a directory, use the method
getAbsolutePath() :
String text = "Local storage : " + file.getAbsolutePath();

4. The list of the root directories
• To get the list of directories and files at the root, use the
method listRoots().
File[] files = File.listRoots();

5. The list of the root directories
• To know if an entry of a directory is a directory, use the method
isDirectory() :
if (file.isDirectory()) {
}
• To get he list of the files and directories of a directory, use the
method listFiles() :
rootFile.listFiles()

6. Layout main.xml
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:orientation="vertical"
android:layout_width="fill_parent"
android:layout_height="fill_parent">
<EditText
android:id="@+id/et_output"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:ems="10" >
</EditText>
</LinearLayout>

7. File Main.java
public class Main extends Activity {
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.main);
EditText et_output = (EditText)findViewById (R.id.et_output);
File file = this.getFilesDir();
String text = "Local storage : " + file.getAbsolutePath();
File[] files = File.listRoots();
for (int i = 0; i < files.length; i++){
String filename = files[i].getAbsolutePath();
filename.replaceAll (new String(new byte[]{0}), "");
File rootFile = new File (filename);
if (file.isDirectory()) {
for (int j = 0; j < rootFile.listFiles().length; j++){
text += rootFile.listFiles() [j].getAbsolutePath() + "rn";
}
}
}
et_output.setText (text);
}
}

8. Test on your mobile
File_ListRoots

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Who am I ?
Bruno Delb (www.delb.cn),
Author of the first french book of development of Java mobile application (2002),
Consultant, project manager and developer of social & mobile applications,
let’s talk about your needs ...
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