本文实例讲述了Android开发之简单文件管理器实现方法。分享给大家供大家参考，具体如下：

这里运用Java I/O、ListActivity、Dialog、Bitmap等实现简单文件管理器，可以查看目录文件，修改文件名，删除文件，打开文件。比较简单，直接看代码：

先看布局文件：

layout/main.xml<?xml version="1.0" encoding="utf-8"?>

android:orientation="vertical"

android:layout_width="fill_parent"

android:layout_height="fill_parent"

>

android:id="@android:id/list"

android:layout_width="wrap_content"

android:layout_height="wrap_content"

/>

文件列表布局:

layout/file.xml<?xml version="1.0" encoding="utf-8"?>

android:orientation="horizontal"

android:layout_width="fill_parent"

android:layout_height="fill_parent"

>

android:id="@+id/imageView"

android:layout_width="wrap_content"

android:layout_height="wrap_content"

/>

android:id="@+id/textView"

android:layout_width="wrap_content"

android:layout_height="wrap_content"

android:textSize="14sp">

修改文件名对话框布局文件：

layout/rename_dialog.xml<?xml version="1.0" encoding="utf-8"?>

xmlns:android="http://schemas.android.com/apk/res/android"

android:layout_width="match_parent"

android:layout_height="match_parent">

android:id="@+id/editText"

android:layout_width="match_parent"

android:layout_height="wrap_content"

/>

主Activity:public class MainActivity extends ListActivity {

private static final String ROOT_PATH = "/";

//存储文件名称

private ArrayList names = null;

//存储文件路径

private ArrayList paths = null;

private View view;

private EditText editText;

/** Called when the activity is first created. */

@Override

public void onCreate(Bundle savedInstanceState) {

super.onCreate(savedInstanceState);

setContentView(R.layout.main);

//显示文件列表

showFileDir(ROOT_PATH);

}

private void showFileDir(String path){

names = new ArrayList();

paths = new ArrayList();

File file = new File(path);

File[] files = file.listFiles();

//如果当前目录不是根目录

if (!ROOT_PATH.equals(path)){

names.add("@1");

paths.add(ROOT_PATH);

names.add("@2");

paths.add(file.getParent());

}

//添加所有文件

for (File f : files){

names.add(f.getName());

paths.add(f.getPath());

}

this.setListAdapter(new MyAdapter(this,names, paths));

}

@Override

protected void onListItemClick(ListView l, View v, int position, long id) {

String path = paths.get(position);

File file = new File(path);

// 文件存在并可读

if (file.exists() && file.canRead()){

if (file.isDirectory()){

//显示子目录及文件

showFileDir(path);

}

else{

//处理文件

fileHandle(file);

}

}

//没有权限

else{

Resources res = getResources();

new AlertDialog.Builder(this).setTitle("Message")

.setMessage(res.getString(R.string.no_permission))

.setPositiveButton("OK",new OnClickListener() {

@Override

public void onClick(DialogInterface dialog, int which) {

}

}).show();

}

super.onListItemClick(l, v, position, id);

}

//对文件进行增删改

private void fileHandle(final File file){

OnClickListener listener = new DialogInterface.OnClickListener() {

@Override

public void onClick(DialogInterface dialog, int which) {

// 打开文件

if (which == 0){

openFile(file);

}

//修改文件名

else if(which == 1){

LayoutInflater factory = LayoutInflater.from(MainActivity.this);

view = factory.inflate(R.layout.rename_dialog, null);

editText = (EditText)view.findViewById(R.id.editText);

editText.setText(file.getName());

OnClickListener listener2 = new DialogInterface.OnClickListener() {

@Override

public void onClick(DialogInterface dialog, int which) {

// TODO Auto-generated method stub

String modifyName = editText.getText().toString();

final String fpath = file.getParentFile().getPath();

final File newFile = new File(fpath + "/" + modifyName);

if (newFile.exists()){

//排除没有修改情况

if (!modifyName.equals(file.getName())){

new AlertDialog.Builder(MainActivity.this)

.setTitle("注意!")

.setMessage("文件名已存在，是否覆盖？")

.setPositiveButton("确定", new DialogInterface.OnClickListener() {

@Override

public void onClick(DialogInterface dialog, int which) {

if (file.renameTo(newFile)){

showFileDir(fpath);

displayToast("重命名成功！");

}

else{

displayToast("重命名失败！");

}

}

})

.setNegativeButton("取消", new DialogInterface.OnClickListener() {

@Override

public void onClick(DialogInterface dialog, int which) {

}

})

.show();

}

}

else{

if (file.renameTo(newFile)){

showFileDir(fpath);

displayToast("重命名成功！");

}

else{

displayToast("重命名失败！");

}

}

}

};

AlertDialog renameDialog = new AlertDialog.Builder(MainActivity.this).create();

renameDialog.setView(view);

renameDialog.setButton("确定", listener2);

renameDialog.setButton2("取消", new DialogInterface.OnClickListener() {

@Override

public void onClick(DialogInterface dialog, int which) {

// TODO Auto-generated method stub

}

});

renameDialog.show();

}

//删除文件

else{

new AlertDialog.Builder(MainActivity.this)

.setTitle("注意!")

.setMessage("确定要删除此文件吗？")

.setPositiveButton("确定", new DialogInterface.OnClickListener() {

@Override

public void onClick(DialogInterface dialog, int which) {

if(file.delete()){

//更新文件列表

showFileDir(file.getParent());

displayToast("删除成功！");

}

else{

displayToast("删除失败！");

}

}

})

.setNegativeButton("取消", new DialogInterface.OnClickListener() {

@Override

public void onClick(DialogInterface dialog, int which) {

}

}).show();

}

}

};

//选择文件时，弹出增删该操作选项对话框

String[] menu = {"打开文件","重命名","删除文件"};

new AlertDialog.Builder(MainActivity.this)

.setTitle("请选择要进行的操作!")

.setItems(menu, listener)

.setPositiveButton("取消", new DialogInterface.OnClickListener() {

@Override

public void onClick(DialogInterface dialog, int which) {

}

}).show();

}

//打开文件

private void openFile(File file){

Intent intent = new Intent();

intent.addFlags(Intent.FLAG_ACTIVITY_NEW_TASK);

intent.setAction(android.content.Intent.ACTION_VIEW);

String type = getMIMEType(file);

intent.setDataAndType(Uri.fromFile(file), type);

startActivity(intent);

}

//获取文件mimetype

private String getMIMEType(File file){

String type = "";

String name = file.getName();

//文件扩展名

String end = name.substring(name.lastIndexOf(".") + 1, name.length()).toLowerCase();

if (end.equals("m4a") || end.equals("mp3") || end.equals("wav")){

type = "audio";

}

else if(end.equals("mp4") || end.equals("3gp")) {

type = "video";

}

else if (end.equals("jpg") || end.equals("png") || end.equals("jpeg") || end.equals("bmp") || end.equals("gif")){

type = "image";

}

else {

//如果无法直接打开，跳出列表由用户选择

type = "*";

}

type += "/*";

return type;

}

private void displayToast(String message){

Toast.makeText(MainActivity.this, message, Toast.LENGTH_SHORT).show();

}

}

自定义适配器：public class MyAdapter extends BaseAdapter{

private LayoutInflater inflater;

private Bitmap directory,file;

//存储文件名称

private ArrayList names = null;

//存储文件路径

private ArrayList paths = null;

//参数初始化

public MyAdapter(Context context,ArrayList na,ArrayList pa){

names = na;

paths = pa;

directory = BitmapFactory.decodeResource(context.getResources(),R.drawable.d);

file = BitmapFactory.decodeResource(context.getResources(),R.drawable.f);

//缩小图片

directory = small(directory,0.16f);

file = small(file,0.1f);

inflater = LayoutInflater.from(context);

}

@Override

public int getCount() {

// TODO Auto-generated method stub

return names.size();

}

@Override

public Object getItem(int position) {

// TODO Auto-generated method stub

return names.get(position);

}

@Override

public long getItemId(int position) {

// TODO Auto-generated method stub

return position;

}

@Override

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

// TODO Auto-generated method stub

ViewHolder holder;

if (null == convertView){

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

holder = new ViewHolder();

holder.text = (TextView)convertView.findViewById(R.id.textView);

holder.image = (ImageView)convertView.findViewById(R.id.imageView);

convertView.setTag(holder);

}

else {

holder = (ViewHolder)convertView.getTag();

}

File f = new File(paths.get(position).toString());

if (names.get(position).equals("@1")){

holder.text.setText("/");

holder.image.setImageBitmap(directory);

}

else if (names.get(position).equals("@2")){

holder.text.setText("..");

holder.image.setImageBitmap(directory);

}

else{

holder.text.setText(f.getName());

if (f.isDirectory()){

holder.image.setImageBitmap(directory);

}

else if (f.isFile()){

holder.image.setImageBitmap(file);

}

else{

System.out.println(f.getName());

}

}

return convertView;

}

private class ViewHolder{

private TextView text;

private ImageView image;

}

private Bitmap small(Bitmap map,float num){

Matrix matrix = new Matrix();

matrix.postScale(num, num);

return Bitmap.createBitmap(map,0,0,map.getWidth(),map.getHeight(),matrix,true);

}

}

因为要对文件进行操作，所以在描述文件中授权：<?xml version="1.0" encoding="utf-8"?>

package="com.test.filemanager"

android:versionCode="1"

android:versionName="1.0">

android:label="@string/app_name">

运行结果如下：

查看目录文件

文件重命名：

删除文件：

打开文件:

希望本文所述对大家Android程序设计有所帮助。

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