Android创建XML并将其写入文件

Question

我正在学习有关Android应用程序开发的课程，并尝试创建xml文件并将其写入android的内部存储中。就方法而言，我在最初设置时遇到问题。我已经写了大部分，但有我无法弄清的错误。也许因为我整天都在工作，所以不知道。这是我本节课的代码。我遇到的错误是公共String宝藏和FileOutputStream上的非法修饰符。任何帮助，将不胜感激。

好的，我找出了最初的问题，需要使用try / catch。能够运行，并且一切正常，直到我进入保存文件。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

这是在“创建文件”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());
}

}

Answer 1

我想通了。我没有正确使用属性标签。快来找出答案，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");

更改所有这些文件之后，我便可以创建文件并将数据写入其中。