Add a new method in FileUtils.java and changed the old method createGetContentIntent()

[Alex-ZHOU]

/**
* Get the Intent for selecting content to be used in an Intent Chooser.
*
* @return The intent for opening a file with Intent.createChooser()
* @author paulburke
/
public static Intent createGetContentIntent() {
// // Implicitly allow the user to select a particular kind of data
// final Intent intent = new Intent(Intent.ACTION_GET_CONTENT);
// // The MIME data type filter
// intent.setType("/*");
// // Only return URIs that can be opened with ContentResolver
// intent.addCategory(Intent.CATEGORY_OPENABLE);
// return intent;
return createGetContentIntent(null);
}

/**
 * Get the Intent for selecting content to be used in an Intent Chooser.
 *
 * @param type Set the type for intent.
 * @return The intent for opening a file with Intent.createChooser()
 * @author AlexZHOU
 */
public static Intent createGetContentIntent(final String type) {
    // Implicitly allow the user to select a particular kind of data
    final Intent intent = new Intent(Intent.ACTION_GET_CONTENT);
    // The MIME data type filter
    intent.setType(type != null ? type : "*/*");
    // Only return URIs that can be opened with ContentResolver
    intent.addCategory(Intent.CATEGORY_OPENABLE);
    return intent;
}