Question

我想在root上创建一个文件夹并放入txt文件并附加数据＆＃39;

我的java代码

  public void generateNoteOnSD(String sFileName, String sBody){
        try
        {
            String fileName = "error";
            String headings = "Hello, world!";
            String path = "/data/root/";
            File file = new File(path, fileName+".txt");
            if (!file.exists()) {
                file.mkdirs();
            }
            File gpxfile = new File(file, sFileName);
            FileWriter writer = new FileWriter(gpxfile);
            writer.append(sBody);
            writer.flush();
            writer.close();
           // Toast.makeText(this, "Saved", Toast.LENGTH_SHORT).show();
        }
        catch(IOException e)
        {
            Log.d("file error", ""+e.getMessage());
        }
       }

我收到文件未找到异常

请帮助我如何在内部存储中的根文件夹上创建文件

Answer 1

尝试此功能。

public void wrtieFileOnInternalStorage(Context mcoContext,String sFileName, String sBody){
    File file = new File(mcoContext.getFilesDir(),"mydir");
    if(!file.exists()){
        file.mkdir();
    }

    try{
        File gpxfile = new File(file, sFileName);
        FileWriter writer = new FileWriter(gpxfile);
        writer.append(sBody);
        writer.flush();
        writer.close();

    }catch (Exception e){

    }
}

Answer 2

尝试这样的事情 -

public Boolean writeToSD(String text){
        Boolean write_successful = false;
         File root=null;  
            try {  
                // <span id="IL_AD8" class="IL_AD">check for</span> SDcard   
                root = Environment.getExternalStorageDirectory();  
                Log.i(TAG,"path.." +root.getAbsolutePath());  

                //check sdcard permission  
                if (root.canWrite()){  
                    File fileDir = new File(root.getAbsolutePath());  
                    fileDir.mkdirs();  

                    File file= new File(fileDir, "samplefile.txt");  
                    FileWriter filewriter = new FileWriter(file);  
                    BufferedWriter out = new BufferedWriter(filewriter);  
                    out.write(text);  
                    out.close();  
                    write_successful = true;
                }  
            } catch (IOException e) {  
                Log.e("ERROR:---", "Could not write file to SDCard" + e.getMessage());  
                write_successful = false;
            }  
        return write_successful;
    }

从这里开始 - http://www.coderzheaven.com/2012/09/06/read-write-files-sdcard-application-sandbox-android-complete-example/

Answer 3

在此声明中：

File gpxfile = new File(file, sFileName);

文件应该是目录（这里使用.txt文件）。

另外，请阅读this。您可以将文件存储在/data/data/<your.package.name>/目录中（尝试使用/data/root/会导致权限被拒绝错误）。

Answer 4

试试这个。使用这个，我在SD卡中创建了日志文件。

public void writeFile(String text){

    File tarjeta = Environment.getExternalStorageDirectory();
    File logFile = new File(tarjeta.getAbsolutePath()+"/", "log.txt");
    if (!logFile.exists())
    {
        try
        {
            logFile.createNewFile();
        } 
        catch (IOException e)
        {
            // TODO Auto-generated catch block
            e.printStackTrace();
        }
    }
    try
    {
        //BufferedWriter for performance, true to set append to file flag
        BufferedWriter buf = new BufferedWriter(new FileWriter(logFile, true)); 
        buf.append(text);
        buf.newLine();
        buf.close();
    }
    catch (IOException e)
    {
        // TODO Auto-generated catch block
        e.printStackTrace();
    }
}

在android中的内部存储中创建一个txt文件

4 个答案: