android往SD卡写文本文件

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private void writeLog(String s){    FileHelper helper = new FileHelper(this);    try {helper.createSDFile("lanhm.txt").getAbsolutePath();helper.writeSDFile(helper.readSDFile("lanhm.txt") + s + "\n", "lanhm.txt"); } catch (IOException e) {e.printStackTrace();}    }    public class FileHelper {private Context context;/** SD卡是否存在 **/private boolean hasSD = false;/** SD卡的路径 **/private String SDPATH;/** 当前程序包的路径 **/private String FILESPATH;public FileHelper(Context context) {this.context = context;hasSD = Environment.getExternalStorageState().equals(android.os.Environment.MEDIA_MOUNTED);SDPATH = Environment.getExternalStorageDirectory().getPath();FILESPATH = this.context.getFilesDir().getPath();}/** * 在SD卡上创建文件 *  * @throws IOException */public File createSDFile(String fileName) throws IOException {File file = new File(SDPATH + "//" + fileName);if (!file.exists()) {file.createNewFile();}return file;}/** * 删除SD卡上的文件 *  * @param fileName */public boolean deleteSDFile(String fileName) {File file = new File(SDPATH + "//" + fileName);if (file == null || !file.exists() || file.isDirectory())return false;return file.delete();}/** * 写入内容到SD卡中的txt文本中 str为内容 */public void writeSDFile(String str, String fileName) {try {FileWriter fw = new FileWriter(SDPATH + "//" + fileName);File f = new File(SDPATH + "//" + fileName);fw.write(str);FileOutputStream os = new FileOutputStream(f);DataOutputStream out = new DataOutputStream(os);out.writeShort(2);out.writeUTF("");System.out.println(out);fw.flush();fw.close();System.out.println(fw);} catch (Exception e) {}}/** * 读取SD卡中文本文件 *  * @param fileName * @return */public String readSDFile(String fileName) {StringBuffer sb = new StringBuffer();File file = new File(SDPATH + "//" + fileName);try {FileInputStream fis = new FileInputStream(file);int c;while ((c = fis.read()) != -1) {sb.append((char) c);}fis.close();} catch (FileNotFoundException e) {e.printStackTrace();} catch (IOException e) {e.printStackTrace();}return sb.toString();}public String getFILESPATH() {return FILESPATH;}public String getSDPATH() {return SDPATH;}public boolean hasSD() {return hasSD;}}
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