我正在学习有关 Android 应用程序开发的类(class)，并尝试创建一个 XML 文件并将其写入 Android 的内部存储。就方法而言，我对如何最初设置它有疑问。我已经写了大部分，但有我无法弄清楚的错误。也许是因为我整天都在做这件事，我不知道。这是我为这门课编写的代码。我得到的错误是 public String treasures 和 FileOutputStream 上的非法修饰符。任何帮助，将不胜感激。

好的，我弄清楚了最初的问题，需要使用 try/catch。能够运行并且一切正常，直到我到达保存文件。现在出现错误:

SoundPool error loading/system./media./audio./ui/KeypressReturn.ogg.  
AudioService Soundpool could not load file: /system/media/audio/ui/KeypressReturnj.ogg

这发生在“文件创建”被写入日志之后。我猜它正在尝试写入错误的文件？需要它写入/data/data。我的应用程序中没有音频。我在下面添加了新代码:

旧代码:

    public void onSaveTreasureClick(View v) throws FileNotFoundException{
        Log.v("SaveTreasure","Button was clicked");
        File f = new File(getFilesDir(),"treasure.xml");
        FileOutputStream myFile=openFileOutput(f);
        Log.v("WriteFile","file created");  


        private FileOutputStream openFileOutput(File f) {
            // TODO Auto-generated method stub
            return null;
        }



    public String treasures(Treasure treasure) throws Exception{

        XmlSerializer xmlSerializer = Xml.newSerializer();
        StringWriter write = new StringWriter();
        final EditText tres=(EditText) findViewById(R.id.treasureNametxt);
        String treasureName=tres.getText().toString();
        final EditText c1=(EditText) findViewById(R.id.clue1Txt);
        String clue1=c1.getText().toString();
        final EditText c2=(EditText) findViewById(R.id.clue2Txt);
        String clue2=c2.getText().toString();
        final EditText c3=(EditText) findViewById(R.id.clue3Txt);
        String clue3=c3.getText().toString();
        final EditText ans=(EditText) findViewById(R.id.answerTxt);
        String answer = ans.getText().toString();
        final EditText loc =(EditText) findViewById(R.id.locationTxt);
        String location = loc.getText().toString();
        final EditText pv=(EditText) findViewById(R.id.pointValueTxt);
        String pointValue=pv.getText().toString();

        xmlSerializer.setOutput(write);
    //start Document
        xmlSerializer.startDocument("UTF-8",true);
    //open tag <items>
        xmlSerializer.startTag("", "Items");
        xmlSerializer.startTag("", "Treasures");

        xmlSerializer.startTag("", "TreasureName");
        xmlSerializer.attribute("", TreasureName, treasureName);
        xmlSerializer.endTag("", "TreasureName");

        xmlSerializer.startTag("", "Clue1");
        xmlSerializer.attribute("", "Clue1", clue1);
        xmlSerializer.endTag("", "Clue1");

        xmlSerializer.startTag("", "Clue2");
        xmlSerializer.attribute("", "Clue2", clue2);
        xmlSerializer.endTag("", "Clue2");

        xmlSerializer.startTag("", "Clue3");
        xmlSerializer.attribute("", "Clue3", clue3);
        xmlSerializer.endTag("", "Clue3");

        xmlSerializer.startTag("", "answer");
        xmlSerializer.attribute("", "answer", answer);
        xmlSerializer.endTag("","answer");

        xmlSerializer.startTag("", "location");
        xmlSerializer.attribute("", "location", location);
        xmlSerializer.endTag("", "location");

        xmlSerializer.startTag("", "Points");
        xmlSerializer.attribute("", "PointValue", pointValue);
        xmlSerializer.endTag("", "Points");

        xmlSerializer.endTag("","Treasures");
        xmlSerializer.endTag("", "Items");

        xmlSerializer.endDocument();

        return treasure.toString();

    }

    }  

}

新代码:

public void onSaveTreasureClick(View v) throws FileNotFoundException, SAXException{
        Log.v("SaveTreasure","Button was clicked");
        File f = new File(getFilesDir(),"treasure.xml");
        FileOutputStream myFile=openFileOutput(f);
        Log.v("WriteFile","file created");  


    //  private FileOutputStream openFileOutput(File f) {
            // TODO Auto-generated method stub
        //  return null;
    //  }


try{
    final String treasures;

        XmlSerializer xmlSerializer = Xml.newSerializer();
        StringWriter writer = new StringWriter();
        final EditText tres=(EditText) findViewById(R.id.treasureNametxt);
        String treasureName=tres.getText().toString();
        final EditText c1=(EditText) findViewById(R.id.clue1Txt);
        String clue1=c1.getText().toString();
        final EditText c2=(EditText) findViewById(R.id.clue2Txt);
        String clue2=c2.getText().toString();
        final EditText c3=(EditText) findViewById(R.id.clue3Txt);
        String clue3=c3.getText().toString();
        final EditText ans=(EditText) findViewById(R.id.answerTxt);
        String answer = ans.getText().toString();
        final EditText loc =(EditText) findViewById(R.id.locationTxt);
        String location = loc.getText().toString();
        final EditText pv=(EditText) findViewById(R.id.pointValueTxt);
        String pointValue=pv.getText().toString();

        xmlSerializer.setOutput(writer);
    //start Document
        xmlSerializer.startDocument("UTF-8",true);
    //open tag <items>
        xmlSerializer.startTag("", "Items");
        xmlSerializer.startTag("", "Treasures");

        xmlSerializer.startTag("", "TreasureName");
        xmlSerializer.attribute("", treasureName, treasureName);
        xmlSerializer.endTag("", "TreasureName");

        xmlSerializer.startTag("", "Clue1");
        xmlSerializer.attribute("", "Clue1", clue1);
        xmlSerializer.endTag("", "Clue1");

        xmlSerializer.startTag("", "Clue2");
        xmlSerializer.attribute("", "Clue2", clue2);
        xmlSerializer.endTag("", "Clue2");

        xmlSerializer.startTag("", "Clue3");
        xmlSerializer.attribute("", "Clue3", clue3);
        xmlSerializer.endTag("", "Clue3");

        xmlSerializer.startTag("", "answer");
        xmlSerializer.attribute("", "answer", answer);
        xmlSerializer.endTag("","answer");

        xmlSerializer.startTag("", "location");
        xmlSerializer.attribute("", "location", location);
        xmlSerializer.endTag("", "location");

        xmlSerializer.startTag("", "Points");
        xmlSerializer.attribute("", "PointValue", pointValue);
        xmlSerializer.endTag("", "Points");

        xmlSerializer.endTag("","Treasures");
        xmlSerializer.endTag("", "Items");

        xmlSerializer.endDocument();

        writer.toString();
                myFile.write(writer.toString().getBytes());

}
catch (FileNotFoundException e) {
    System.err.println("FileNotFoundException: " + e.getMessage());
    throw new SAXException(e);

} catch (IOException e) {
    System.err.println("Caught IOException: " + e.getMessage());
}

}

最佳答案

我想出了这个。我错误地使用了属性标签。来发现，我什至不需要使用它。正确的方法是执行以下操作:

xmlSerializer.startTag("", "TreasureName");
xmlSerializer.text(treasureName);
xmlSerializer.endTag("","TreasureName");

在更改所有这些之后，我能够创建文件并将数据写入其中。

关于java - Android 创建 xml 并将其写入文件，我们在Stack Overflow上找到一个类似的问题： https://stackoverflow.com/questions/18423650/