Android之简单文件管理器

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"?><LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"    android:orientation="vertical"    android:layout_width="fill_parent"    android:layout_height="fill_parent"    ><ListView      android:id="@android:id/list"    android:layout_width="wrap_content"    android:layout_height="wrap_content"    /></LinearLayout>

文件列表布局:

layout/file.xml

<?xml version="1.0" encoding="utf-8"?><LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"    android:orientation="horizontal"    android:layout_width="fill_parent"    android:layout_height="fill_parent"    ><ImageView    android:id="@+id/imageView"    android:layout_width="wrap_content"    android:layout_height="wrap_content"/><TextView  android:id="@+id/textView"  android:layout_width="wrap_content"  android:layout_height="wrap_content"  android:textSize="14sp"></TextView></LinearLayout>

修改文件名对话框布局文件：

layout/rename_dialog.xml

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

主Activity:

public class MainActivity extends ListActivity {    private static final String ROOT_PATH = "/";    //存储文件名称    private ArrayList<String> names = null;    //存储文件路径    private ArrayList<String> 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<String>();        paths = new ArrayList<String>();        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<String> names = null;    //存储文件路径    private ArrayList<String> paths = null;    //参数初始化    public MyAdapter(Context context,ArrayList<String> na,ArrayList<String> 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"?><manifest xmlns:android="http://schemas.android.com/apk/res/android"      package="com.test.filemanager"      android:versionCode="1"      android:versionName="1.0">    <uses-sdk android:minSdkVersion="10" />    <uses-permission android:name="android.permission.MOUNT_UNMOUNT_FILESYSTEMS"/>    <uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE"/>    <application android:icon="@drawable/icon" android:label="@string/app_name">        <activity android:name=".MainActivity"                  android:label="@string/app_name">            <intent-filter>                <action android:name="android.intent.action.MAIN" />                <category android:name="android.intent.category.LAUNCHER" />            </intent-filter>        </activity>    </application></manifest>

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:

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