Android/java 读写文件

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读内存卡的文件

读取图片，视频等媒体文件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();}

读取文本文件，用Strng保存

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;}

写图片，视频等媒体文件，必须用byte[]来写

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();}       }

写文本文件，写log信息都可以

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

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