Android：在SD卡上写一个xml

Question

我的android-app有问题。 我想将数据列表保存在xml中，并将其保存到SD卡。

这里从我的活动中的代码片段：

Button btnActivity = (Button)findViewById(R.id.modul_save); 
     btnActivity.setOnClickListener(new View.OnClickListener() 
     { 
      @Override 
      public void onClick(View v) { 
       Handlerlist templist=new Handlerlist();         //default-constructor for handlerlist 
       Parser_Writer temp_parser=new Parser_Writer();       //default-constructor for praser(writing) 
       templist.add_modul(name, abk, 1, 0, "Hallo", room, 1, 2, 3, 1.3, true); //save input-data in the list 

       temp_parser.write_xml(templist);          //calls the parser(writing) 
       Intent in = new Intent(modul_create.this,modul_overview.class);  
       startActivity(in); 
      } 
     }); 

这是我的解析器：

public class Parser_Writer { 

public Parser_Writer(){ 
} 

    public void write_xml(Handlerlist h){ 
     XStream xstream = new XStream(new DomDriver()); 
     try { 
      String xml = xstream.toXML(h); 

      String path=Environment.getExternalStorageDirectory().toString(); 

      File myXml= new File(path+"new.xml"); 
      myXml.createNewFile(); 
      FileWriter fileIO =new FileWriter(myXml); 
      fileIO.write("<?xml version='1.0' encoding='utf-8'?>"); 
      fileIO.write(xml.toString()); 
      fileIO.close(); 

      } catch (IOException e) { 
       // TODO Auto-generated catch block 
       e.printStackTrace(); 
      } 
    } 

}

我还加了android.permission.WRITE_EXTERNAL_STORAGE ...但我不能写我的存储！我得到了以下的logcat消息：这里

java.io.IOException: Read-only file system 
at java.io.File.createNewFileImpl(Native Method) 
at java.io.File.createNewFile(File.java:1160) 
at Parser.Parser_Writer.write_xml(Parser_Writer.java:38) 
at StundentenApp.main.modul_create$1.onClick(modul_create.java:51) 
at android.view.View.performClick(View.java:2408) 
at android.view.View$PerformClick.run(View.java:8816) 
at android.os.Handler.handleCallback(Handler.java:587) 
at android.os.Handler.dispatchMessage(Handler.java:92) 
at android.os.Looper.loop(Looper.java:123) 
at android.app.ActivityThread.main(ActivityThread.java:4627) 
at java.lang.reflect.Method.invokeNative(Native Method) 
at java.lang.reflect.Method.invoke(Method.java:521) 
at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:868) 
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:626) 
at dalvik.system.NativeStart.main(Native Method) 

人谁可以帮帮我吗？

谢谢！

Answer 1

这是一个在黑暗中拍摄 - 这可能是你有你的SD卡锁定毕竟 - 但是请尝试更改以下：

File myXml= new File(path+"new.xml"); 

这样：

File myXml= new File(path+"/new.xml");