android遍历sd卡中的所有文件

最近做个上传图片功能，需要对sd中的所需要的图片进行上传，需要在sd卡中找到这个图片。具体方法如下：

file_row.xml:

<?xml version="1.0" encoding="utf-8"?>
<TextView android:id="@+id/text1"
xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="wrap_content"
android:layout_height="wrap_content" />

directory_list.xml:

TestGrid.java:

import java.io.File;
import java.io.FileFilter;
import java.util.ArrayList;
import java.util.List;

import android.app.ListActivity;
import android.os.Bundle;
import android.view.KeyEvent;
import android.view.View;
import android.widget.ListView;

public class TestGrid extends ListActivity {
private static final FileFilter IMAGES_FILTER = new FileFilter() {

public boolean accept(File f) {
return f.isDirectory() || f.getName().matches("^.*?\\.(jpg|png|bmp|gif)$");
}
};

private FileListAdapter fileList;

public void onCreate(Bundle icicle) {
super.onCreate(icicle);
setContentView(R.layout.directory_list);
fill(new File("/"));
}

public boolean onKeyDown(int keyCode, KeyEvent event) {
if (keyCode == KeyEvent.KEYCODE_BACK && !fileList.isRoot()) {
fill(fileList.getItem(1));
return true;
}
return super.onKeyDown(keyCode, event);
}

private void fill(File folder) {
List<File> files = new ArrayList<File>();
files.add(folder);
if (folder.getParentFile() != null)
files.add(folder.getParentFile());

for (File file : folder.listFiles(IMAGES_FILTER)) {
files.add(file);
}

fileList = new FileListAdapter(this, R.layout.file_row, files);
setListAdapter(fileList);
}

@Override
protected void onListItemClick(ListView l, View v, int position, long id) {
File file = fileList.getItem(position);
if (file.isDirectory())
fill(file);
// TODO use image switcher to display selected images
}
}

FileListAdapter.java

import java.io.File;
import java.util.List;

import android.content.Context;
import android.view.View;
import android.view.ViewGroup;
import android.widget.ArrayAdapter;
import android.widget.TextView;

public class FileListAdapter extends ArrayAdapter<File>{

public FileListAdapter(Context context, int Resource,List<File> objects) {
super(context,Resource,objects);
// TODO Auto-generated constructor stub
}

@Override
public View getView(int position, View convertView, ViewGroup parent) {
TextView view = (TextView) super.getView(position, convertView, parent);
File file = getItem(position);
if (position == 0)
view.setText(view.getResources().getString(R.string.current_folder) + file.getAbsolutePath());
else if (position == 1 && !isRoot())
view.setText(R.string.to_parent_folder);
else
view.setText(file.getName());
return view;
}

public boolean isRoot() {
return getItem(0).getParent() == null;
}

}

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