Android/java 讀寫檔案

讀記憶卡的檔案

讀取圖片，視頻等媒體檔案byte流，

public static byte[] readStream(String imagepath) throws Exception {FileInputStream fs = new FileInputStream(imagepath);ByteArrayOutputStream outStream = new ByteArrayOutputStream();byte[] buffer = new byte[1024];int len = 0;while (-1 != (len = fs.read(buffer))) {outStream.write(buffer, 0, len);}outStream.close();fs.close();return outStream.toByteArray();}

讀取文字檔，用Strng儲存

public String readFile(String filename){   String content = null;   File file = new File(filename); //for ex foo.txt   try {       FileReader reader = new FileReader(file);       char[] chars = new char[(int) file.length()];       reader.read(chars);       content = new String(chars);       reader.close();   } catch (IOException e) {       e.printStackTrace();   }   return content;}

寫圖片，視頻等媒體檔案，必須用byte[]來寫

public void writeFile(String filePath,byte[] f){try {FileOutputStream out = new FileOutputStream(new File(filePath));out.write(f);out.close();} catch (IOException e) {e.printStackTrace();}       }

寫文字檔，寫log資訊都可以

public void writeFile(String filePath,String f){FileWriter fw;try {fw = new FileWriter(filePath);fw.write(f);fw.close();} catch (IOException e) {e.printStackTrace();}       }