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/