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android保存文件到SD卡中

news 来源：原创 2024/5/17 19:44:12

想把文件保存到SD卡中，一定要知道SD卡的路径，有人说可以用File explore来查看，这种方法不太好，因为随着android版本的升级，SD卡的路径可能会发生改变。在1.6的时候SD的路径是/sdCard。后续版本都改成了mnt/sdCard。所有还是使用API来获取：

Environment.getExternalStorageDirectory()

另外，在保存之前要判断SD卡是否已经安装好，并且可读写：

//判断SDcard是否存在并且可读写
               if(Environment.getExternalStorageState().equals(Environment.MEDIA_MOUNTED)){
                   service.saveToSDCard(filename,filecontent);
                   Toast.makeText(getApplicationContext(), R.string.success, 1).show();
               }else{
                   Toast.makeText(getApplicationContext(), R.string.sdcarderror, 1).show();
               }

查看完整代码：

   /**
   * 保存到SD卡
   * @param filename
   * @param filecontent
   * @throws Exception
   */
   public void saveToSDCard(String filename, String filecontent)throws Exception{
       File file = new File(Environment.getExternalStorageDirectory(),filename);
       FileOutputStream outStream = new FileOutputStream(file);
       outStream.write(filecontent.getBytes());
       outStream.close();
   }

   @Override
       public void onClick(View v) {
           EditText filenameText = (EditText)findViewById(R.id.filename);
           EditText filecontentText = (EditText)findViewById(R.id.filecontent);
           String filename = filenameText.getText().toString();
           String filecontent = filecontentText.getText().toString();
           FileService service = new FileService(getApplicationContext());
           try {
               //判断SDcard是否存在并且可读写
               if(Environment.getExternalStorageState().equals(Environment.MEDIA_MOUNTED)){
                   service.saveToSDCard(filename,filecontent);
                   Toast.makeText(getApplicationContext(), R.string.success, 1).show();
               }else{
                   Toast.makeText(getApplicationContext(), R.string.sdcarderror, 1).show();
               }

           } catch (Exception e) {
               Toast.makeText(getApplicationContext(), R.string.fail, 1).show();
               e.printStackTrace();
           }
           Toast.makeText(getApplicationContext(), R.string.success, 1).show();
       }