Android查看并显示sdcard下文件

一：程序所显示的Activity

public class FileShow extends Activity implements android.view.View.OnClickListener{

private void init() {

btnBack = (Button) findViewById(R.id.back); btnHome = (Button) findViewById(R.id.home); btnBack.setOnClickListener(this); btnHome.setOnClickListener(this);

tvTitle = (TextView) findViewById(R.id.tvTitle);

lvFiles = (ListView) findViewById(android.R.id.list);

//browseTo方法访问mnt下的sdcard目录，此方法返回目录中的所有子目录和private ListView lvFiles;

private ArrayList items; private FileListAdapter adapter; private File current_dir; private TextView tvTitle;

private Button btnBack, btnHome;

文件填充到items集合

browseTo(new File(\"/mnt/sdcard\"));

adapter = new FileListAdapter(this, items); lvFiles.setAdapter(adapter);

}

// 浏览根目录

private void browseRoot() {

browseTo(new File(\"/mnt/sdcard\")); }

// 浏览上级目录

private void browseUpLevel() {

if (current_dir.getParent() != null) {

browseTo(current_dir.getParentFile());

} }

// 浏览指定目录

private void browseTo(File dir) { // 如果dir对象是一个目录

if (dir.isDirectory()) { // 改变标题栏的标题

tvTitle.setText(dir.getAbsolutePath()); // 更改当前目录为指定目录 this.current_dir = dir;

// 查找dir目录中的所有子目录和文件 填充到items集合

fill(current_dir.listFiles()); } }

private void fill(File[] files) {

// 如果items未初始化则初始化 if (items == null) {

items = new ArrayList(); }

// 清空items中所存储的原目录信息 items.clear();

Resources res = getResources(); if (files != null) {

// 遍历当前目录中的所有文件和子目录

for (File file : files) { // 获取文件名

String fileName = file.getName(); // 获取文件或目录的图标 Drawable icon = null; // 如果是目录，则图标为folder if (file.isDirectory()) {

icon = res.getDrawable(R.drawable.folder); } else {

// 如果测试为音频文件，设置图标 if (checkEnd(fileName,

res.getStringArray(R.array.audioFile))) { icon = res.getDrawable(R.drawable.audio);

}

// 如果测试为图片文件，设置图标 else if (checkEnd(fileName,

res.getStringArray(R.array.imageFile))) { icon = res.getDrawable(R.drawable.image);

} else if (checkEnd(fileName,

res.getStringArray(R.array.packageFile))) { icon = res.getDrawable(R.drawable.packed); } else if (checkEnd(fileName,

res.getStringArray(R.array.webFile))) {

icon = res.getDrawable(R.drawable.webtext); } else {

icon = res.getDrawable(R.drawable.text); }

}

// 创建fileitem对象，并添加到集合

FileItem item = new FileItem(fileName, icon);

}

items.add(item);

} }

// 如果adapter不为null 则通知更新界面 if (adapter != null)

adapter.dataChanged(items);

}

// 检查指定文件名 是否以数组中指定的扩展名结尾

private boolean checkEnd(String fileName, String[] endType) {

if (fileName != null && endType != null) {

for (String end : endType) {

if (fileName.endsWith(end)) return true;

} }

return false; }

@Override

public void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.main); init(); }

@Override

public void onClick(View v) { switch (v.getId()) {

case R.id.back:

browseUpLevel(); break; case R.id.home:

browseRoot(); break;

} }

二：Adapter:

public class FileListAdapter extends BaseAdapter {

ArrayList items; LayoutInflater inflater;

FileListAdapter(Context

context,ArrayList

public items){

this.inflater = LayoutInflater.from(context);

this.items = items; }

public void dataChanged(ArrayList items){ }

@Override

public int getCount() { }

@Override

public Object getItem(int position) { return items.get(position); }

@Override

public long getItemId(int position) { return position; }

@Override

return items.size();

this.items = items;

this.notifyDataSetChanged();

public View getView(int position, View convertView, ViewGroup parent) {

ViewHolder holder = null; if(convertView==null){

convertView = inflater.inflate(R.layout.item, null);

holder = new ViewHolder(); holder.ivFileIcon

= =

(ImageView)convertView.findViewById(R.id.ivFileIcon); holder.tvFileName

(TextView)convertView.findViewById(R.id.tvFileName); convertView.setTag(holder);

}else{

holder = (ViewHolder)convertView.getTag(); }

FileItem item = items.get(position);

holder.ivFileIcon.setImageDrawable(item.getFileIcon()); holder.tvFileName.setText(item.getFileName());

return convertView;

}

class ViewHolder{

ImageView ivFileIcon;

TextView tvFileName;

} }

三：item

public class FileItem {

public FileItem() { super(); }

public FileItem(String fileName, Drawable fileIcon) { super();

this.fileName = fileName; this.fileIcon = fileIcon; }

String fileName; Drawable fileIcon;

public String getFileName() { return fileName;

}

public void setFileName(String fileName) { this.fileName = fileName; }

public Drawable getFileIcon() { return fileIcon; }

public void setFileIcon(Drawable fileIcon) { this.fileIcon = fileIcon; }

}

四：配置文件：

.jpg

.jpeg

.png .gif

.mp3 .wav .midi .acc

.rar .zip .jar

.apk

.html .htm

.php .jsp

.txt