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: