文件操作(File)

//创建文件  
public static boolean createFile(File file, boolean deleteOnExists) throws IOException {  

                 if ( file . exists ()) {  
                         if ( deleteOnExists ){  
                                 deleteFile ( file );  
                         } else {  
                                 return true ;  
                         }  
                 }  
         File parent = file . getParentFile ();  
         if ( parent != null && ! parent . exists ()) {  
                 parent . mkdirs ();  
         }  
         return file . createNewFile ();  
     }  
     


//删除文件     
public static boolean deleteFile ( File path ) {  
                 boolean result = true ;  
                 if ( path . exists ()) {  
                         if ( path . isDirectory ()) {  
                                 File [] files = path . listFiles ();  
                                 for ( int i = 0 , count = files . length ; i < count ; i ++) {  
                                         result &= deleteFile ( files [ i ]);  
                                 }  
                                 result &= path . delete (); // Delete empty directory.  
                         } else {  
                                 result &= path . delete ();  
                         }  
                         return result ;  
                 } else {  
                         return false ;  
                 }  
        }  


//删除文件夹内文件  
public static boolean deleteInternalFilr ( File path ){  
         boolean result = true ;  
         if ( path . exists ()){  
              if ( path . isDirectory ()){  
                  File [] files = path . listFiles ();  
                  for ( int i = 0 , count = files . length ; i < count ; i ++) {  
                          result &= deleteFile ( files [ i ]);  
                      }  
                  }  
              }  
              return result ;  
        }  


//安装文件  
public static boolean installFile ( File path , Activity context ){  
         boolean result = true ;  
         try {  
              Intent intent = new Intent ( Intent . ACTION_VIEW );  
              intent . setDataAndType ( Uri . fromFile ( path ), "application/vnd.android.package-archive" );  
              context . startActivityForResult ( intent , 1 );  
         } catch ( Exception ex ){  
              ex . printStackTrace ();  
              result = false ;  
         }  
              return result ;  
         }  
         


//复制文件 
public static boolean copyFile ( String savePath , String sourcePath ){  
                 try {  
                         FileInputStream fis = new FileInputStream ( new File ( sourcePath ));  
                         FileOutputStream fos = new FileOutputStream ( new File ( savePath ));  
                         
                         byte [] temp = new byte [ 1024 ];  
                         
                         int ch ;  
                         while (( ch = fis . read ( temp ))!=- 1 ){  
                                 fos . write ( temp , 0 , ch );  
                         }  
                         
                 } catch ( Exception e ){  
                         e . printStackTrace ();  
                         return false ;  
                 }  
                 return true ;  
         }