Android：写文本到txt [英] Android: Write text to txt

问题描述

使用下面的代码，我尝试写入我的SD卡：

  public void writedata（String data）{
 // BufferedWriter out = null; 
 
 System.out.println（data）; 
尝试{
 
 FileOutputStream out = new FileOutputStream（new File（/ sdcard / tsxt.txt））; 
 out.write（data.getBytes（））; 
 out.close（）; 
 
} catch（Exception e）{// fehlende Permission or sd an pc gemountet} 
 System.out.println（CCCCCCCCCCCCCCCCCCCCCCCALSKDJLAK）; 
 
 
 $ b $ / code 
 $ b $ <$>  
 
 
 < uses-permission android：name =android.permission.WRITE_EXTERNAL_STORAGE/> 
  
但现在，当我打开文件时，没有任何内容。问题在哪里？我确信 data 有一定的价值。 
 
 
 编辑： 
 
 
 
我在LogCat中得到这个信息： 
 
 
  02-06 01:59： 51.676：W / System.err（1197）：java.io.FileNotFoundException：/storage/sdcard0/sdcard/tsxt.txt：打开失败：ENOENT（没有这样的文件或目录）
  
我试图在SD卡上创建文件，但仍然出现相同的错误。是否有代码，如果它不存在的文件创建？
解决方案
试试这个代码：
 文件sdCard = Environment.getExternalStorageDirectory（）; 
 File dir = new File（sdCard.getAbsolutePath（）+/ dir）; 
 
档案档案=新档案（dir，tsxt.txt）; 
 
 FileOutputStream f = new FileOutputStream（file）; 
  
所以文件路径不正确。您应该删除目录名称：
 $ b $ pre $ 文件dir = new File（sdCard.getAbsolutePath（）+/）; 
  




With the following code, I try to write to my sdcard:

public void writedata(String data) {
          //BufferedWriter out = null;

          System.out.println(data);
          try{

              FileOutputStream out = new FileOutputStream(new File("/sdcard/tsxt.txt"));
              out.write(data.getBytes());
              out.close();  

                } catch (Exception e) { //fehlende Permission oder sd an pc gemountet}
                    System.out.println("CCCCCCCCCCCCCCCCCCCCCCCALSKDJLAK");
                }

          }

The permission in the Manifest:

<uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE"/>  

But now, when I open the file, nothing is in there. Where´s the problem? I´m sure data has some value.

EDIT:

I get this message in the LogCat:

02-06 01:59:51.676: W/System.err(1197): java.io.FileNotFoundException: /storage/sdcard0/sdcard/tsxt.txt: open failed: ENOENT (No such file or directory)

I tried to create the file on the sdcard but still the same error. Is there a code that the File is created if it doesn´t exists?

解决方案

Try with this code:

File sdCard = Environment.getExternalStorageDirectory();
File dir = new File (sdCard.getAbsolutePath() + "/dir");

File file = new File(dir, "tsxt.txt");

FileOutputStream f = new FileOutputStream(file);

So the path to the file is not correct. You should remove directory name:

File dir = new File (sdCard.getAbsolutePath() + "/");

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