Android 之简单文件管理器

转自：http://www.open-open.com/lib/view/open1336639193687.html

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

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<?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

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<?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

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<?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:

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publicclass MainActivity extendsListActivity {

    privatestatic final String ROOT_PATH = "/";

    //存储文件名称

    privateArrayList<String> names = null;

    //存储文件路径

    privateArrayList<String> paths = null;

    privateView view;

    privateEditText editText;

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

    @Override

    publicvoid onCreate(Bundle savedInstanceState) {

        super.onCreate(savedInstanceState);

        setContentView(R.layout.main);

        //显示文件列表

        showFileDir(ROOT_PATH);

    }

    privatevoid showFileDir(String path){

        names = newArrayList<String>();

        paths = newArrayList<String>();

        File file = newFile(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(newMyAdapter(this,names, paths));

    }

    @Override

    protectedvoid onListItemClick(ListView l, View v, intposition, longid) {

        String path = paths.get(position);

        File file = newFile(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();

            newAlertDialog.Builder(this).setTitle("Message")

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

            .setPositiveButton("OK",newOnClickListener() {

                @Override

                publicvoid onClick(DialogInterface dialog, intwhich) {

                     

                }

            }).show();

        }

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

    }

    //对文件进行增删改

    privatevoid fileHandle(finalFile file){

        OnClickListener listener = newDialogInterface.OnClickListener() {

            @Override

            publicvoid onClick(DialogInterface dialog, intwhich) {

                // 打开文件

                if(which == 0){

                    openFile(file);

                }

                //修改文件名

                elseif(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 = newDialogInterface.OnClickListener() {

                        @Override

                        publicvoid onClick(DialogInterface dialog, intwhich) {

                            // TODO Auto-generated method stub

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

                            finalString fpath = file.getParentFile().getPath();

                            finalFile newFile = newFile(fpath + "/"+ modifyName);

                            if(newFile.exists()){

                                //排除没有修改情况

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

                                    newAlertDialog.Builder(MainActivity.this)

                                    .setTitle("注意!")

                                    .setMessage("文件名已存在，是否覆盖？")

                                    .setPositiveButton("确定", newDialogInterface.OnClickListener() {

                                        @Override

                                        publicvoid onClick(DialogInterface dialog, intwhich) {

                                            if(file.renameTo(newFile)){

                                                showFileDir(fpath);

                                                displayToast("重命名成功！");

                                            }

                                            else{

                                                displayToast("重命名失败！");

                                            }

                                        }

                                    })

                                    .setNegativeButton("取消", newDialogInterface.OnClickListener() {

                                        @Override

                                        publicvoid onClick(DialogInterface dialog, intwhich) {

                                             

                                        }

                                    })

                                    .show();

                                }

                            }

                            else{

                                if(file.renameTo(newFile)){

                                    showFileDir(fpath);

                                    displayToast("重命名成功！");

                                }

                                else{

                                    displayToast("重命名失败！");

                                }

                            }

                        }

                    };

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

                    renameDialog.setView(view);

                    renameDialog.setButton("确定", listener2);

                    renameDialog.setButton2("取消", newDialogInterface.OnClickListener() {

                        @Override

                        publicvoid onClick(DialogInterface dialog, intwhich) {

                            // TODO Auto-generated method stub

                             

                        }

                    });

                    renameDialog.show();

                }

                //删除文件

                else{

                    newAlertDialog.Builder(MainActivity.this)

                    .setTitle("注意!")

                    .setMessage("确定要删除此文件吗？")

                    .setPositiveButton("确定", newDialogInterface.OnClickListener() {

                        @Override

                        publicvoid onClick(DialogInterface dialog, intwhich) {

                            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", newDialogInterface.OnClickListener() {

                        @Override

                        publicvoid onClick(DialogInterface dialog, intwhich) {

                             

                        }

                    }).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"};

        newAlertDialog.Builder(MainActivity.this)

        .setTitle("请选择要进行的操作!")

        .setItems(menu, listener)

        .setPositiveButton("取消", newDialogInterface.OnClickListener() {

            @Override

            publicvoid onClick(DialogInterface dialog, intwhich) {

                 

            }

        }).show();

    }

    //打开文件

    privatevoid openFile(File file){

        Intent intent = newIntent();

        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

    privateString 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";

        }

        elseif(end.equals("mp4") || end.equals("3gp")) {

            type = "video";

        }

        elseif (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 += "/*";

        returntype;

    }

    privatevoid displayToast(String message){

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

    }

}

自定义适配器：

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publicclass MyAdapter extendsBaseAdapter{

    privateLayoutInflater inflater;

    privateBitmap directory,file;

    //存储文件名称

    privateArrayList<String> names = null;

    //存储文件路径

    privateArrayList<String> paths = null;

    //参数初始化

    publicMyAdapter(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

    publicint getCount() {

        // TODO Auto-generated method stub

        returnnames.size();

    }

 

    @Override

    publicObject getItem(intposition) {

        // TODO Auto-generated method stub

        returnnames.get(position);

    }

 

    @Override

    publiclong getItemId(intposition) {

        // TODO Auto-generated method stub

        returnposition;

    }

 

    @Override

    publicView getView(intposition, View convertView, ViewGroup parent) {

        // TODO Auto-generated method stub

        ViewHolder holder;

        if(null== convertView){

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

            holder = newViewHolder();

            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 = newFile(paths.get(position).toString());

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

            holder.text.setText("/");

            holder.image.setImageBitmap(directory);

        }

        elseif (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);

            }

            elseif (f.isFile()){

                holder.image.setImageBitmap(file);

            }

            else{

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

            }

        }

        returnconvertView;

    }

    privateclass ViewHolder{

        privateTextView text;

        privateImageView image;

    }

    privateBitmap small(Bitmap map,floatnum){

        Matrix matrix = newMatrix();

        matrix.postScale(num, num);

        returnBitmap.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：

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<?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"/>

   <strong> <uses-permission android:name="android.permission.MOUNT_UNMOUNT_FILESYSTEMS"/>

    <uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE"/></strong>     <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: