Android 創建文件夾、生成文件並寫入文本文件內容

• 1、首先添加權限

   
  <uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE"></uses-permission>
  2、創建文件夾、生成文件並寫入文本文件內容代碼
   
  private void initData() {
      String filePath = "/sdcard/Test/";
      String fileName = "log.txt";
      
      writeTxtToFile("txt content", filePath, fileName);
  }
   
  // 將字符串寫入到文本文件中
  public void writeTxtToFile(String strcontent, String filePath, String fileName) {
      //生成文件夾以後，再生成文件，否則會出錯
      makeFilePath(filePath, fileName);
      
      String strFilePath = filePath+fileName;
      // 每次寫入時，都換行寫
      String strContent = strcontent + "\r\n";
      try {
          File file = new File(strFilePath);
          if (!file.exists()) {
              Log.d("TestFile", "Create the file:" + strFilePath);
              file.getParentFile().mkdirs();
              file.createNewFile();
          }
          RandomAccessFile raf = new RandomAccessFile(file, "rwd");
          raf.seek(file.length());
          raf.write(strContent.getBytes());
          raf.close();
      } catch (Exception e) {
          Log.e("TestFile", "Error on write File:" + e);
      }
  }
   
  // 生成文件
  public File makeFilePath(String filePath, String fileName) {
      File file = null;
      makeRootDirectory(filePath);
      try {
          file = new File(filePath + fileName);
          if (!file.exists()) {
              file.createNewFile();
          }
      } catch (Exception e) {
          e.printStackTrace();
      }
      return file;
  }
   
  // 生成文件夾
  public static void makeRootDirectory(String filePath) {
      File file = null;
      try {
          file = new File(filePath);
          if (!file.exists()) {
              file.mkdir();
          }
      } catch (Exception e) {
          Log.i("error:", e+"");
      }