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();       }   }