根据微调按钮选择显示其他数据 [英] Display other data based on spinner selection
本文介绍了根据微调按钮选择显示其他数据的处理方法，对大家解决问题具有一定的参考价值，需要的朋友们下面随着小编来一起学习吧！
问题描述
我有一个XML文件，其中我在微调控制框中显示了第一个标记(宝藏名称)中的文本，以供用户选择。一旦选择，我需要能够访问存储在XML文档(存储在设备上的数据文件中)中的与所选宝藏名称相关联的其他数据。我已经解析了XML文件，并将每一项存储在单独的数组列表中。当用户点击一个按钮(获取线索)时，我需要能够显示与该宝藏相关的第一条线索。这个项目今天午夜前要交，这是我看起来拿不到的最后一件作品。任何帮助都将不胜感激。我添加了代码以尝试执行此操作：
import java.io.File;
import java.io.FileNotFoundException;
import java.io.FileReader;
//import java.lang.reflect.Array;
import java.util.ArrayList;
import org.xmlpull.v1.XmlPullParser;
import org.xmlpull.v1.XmlPullParserException;
import org.xmlpull.v1.XmlPullParserFactory;
import android.os.Bundle;
import android.app.Activity;
//import android.text.TextUtils;
import android.util.Log;
import android.view.Menu;
import android.view.View;
import android.widget.AdapterView;
import android.widget.AdapterView.OnItemSelectedListener;
import android.widget.ArrayAdapter;
import android.widget.Spinner;
import android.widget.TextView;
import android.widget.Toast;
public class PlayGeoTreasureActivity extends Activity implements OnItemSelectedListener {
ArrayList<String> treasureList=new ArrayList<String>();
ArrayList<String>clue1List=new ArrayList<String>();
ArrayList<String> clue2List=new ArrayList<String>();
ArrayList<String> clue3List=new ArrayList<String>();
ArrayList<String> answerList=new ArrayList<String>();
ArrayList<String> locationList=new ArrayList<String>();
ArrayList<String> pointValueList=new ArrayList<String>();
XmlPullParserFactory parser;
XmlPullParser xpp;
TextView selected;
Spinner spinnerTreasures;
//Spinner spinnerTreasures = new Spinner(this);
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_play_geo_treasure);
spinnerTreasures = (Spinner)findViewById(R.id.treasuresSpinner);
//get the xml file
File filename = new File(getFilesDir(), "treasure.xml");
//check to see if file exists. If it does, read it.
try {
if(filename.exists())
{
readXML(filename);
}
else
{
Toast.makeText(null, "File not Found", Toast.LENGTH_LONG).show();
}
}catch (FileNotFoundException e) {
//String errorMessage=(e.getMessage()==null)?"Message is Empty":e.getMessage();
//Log.e("GeoTreasureGameLog",errorMessage);
Log.e("GeoTreasureGameLog", (e.toString()));
e.printStackTrace();
} catch (XmlPullParserException e) {
//String errMessage=(e.getMessage()==null)?"Message is Empty":e.getMessage();
//Log.e("GeoTreasureGameLog",errMessage);
Log.e("GeoTreasureGameLog", (e.toString()));
e.printStackTrace();
}
}
private void readXML(File filename) throws XmlPullParserException, FileNotFoundException {
// pull parser to read xml file
parser = XmlPullParserFactory.newInstance();
xpp = parser.newPullParser();
// point the xml parser to file
xpp.setInput(new FileReader(filename));
// get start and end tags
int eventType = xpp.getEventType();
// set current tag
String currentTag="";
// current value of the tag's element
String currentElement="";
//int counter = 0;
try{
// parse the entire xml file until done
while (eventType != XmlPullParser.END_DOCUMENT)
{
// look for start tags
if(eventType == XmlPullParser.START_TAG)
{
// get the name of the start tag
currentTag = xpp.getName();
if (currentTag.equals("TreasureName"))
{
currentElement = xpp.nextText();
treasureList.add(currentElement);
}
else if (currentTag.equals("ClueOne"))
{
currentElement = xpp.nextText();
clue1List.add(currentElement);
}
else if (currentTag.equals("ClueTwo"))
{
currentElement = xpp.nextText();
clue2List.add(currentElement);
}
else if (currentTag.equals("ClueThree"))
{
currentElement = xpp.nextText();
clue3List.add(currentElement);
}
else if (currentTag.equals("Answer"))
{
currentElement = xpp.nextText();
answerList.add(currentElement);
}
else if (currentTag.equals("TreasureLocation"))
{
currentElement = xpp.nextText();
locationList.add(currentElement);
}
else if (currentTag.equals("PointValue"))
{
currentElement = xpp.nextText();
pointValueList.add(currentElement);
}
}
eventType = xpp.next();
}
} catch (Exception e)
{
//Log.e("GeoTreasureGameLog", e.getMessage());
Log.e("GeoTreasureGameLog", (e.toString()));
}
ArrayAdapter<String> spinnerArrayAdapter = new ArrayAdapter<String>(getApplicationContext(), android.R.layout.simple_spinner_dropdown_item,treasureList);
selected=(TextView) findViewById(R.id.itemSelected);
spinnerTreasures.setOnItemSelectedListener(PlayGeoTreasureActivity.this);
spinnerTreasures.setAdapter(spinnerArrayAdapter);
}
@Override
public boolean onCreateOptionsMenu(Menu menu) {
// Inflate the menu; this adds items to the action bar if it is present.
getMenuInflater().inflate(R.menu.play_geo_treasure, menu);
return true;
}
@Override
public void onItemSelected(AdapterView<?> parent,
View v, int position, long id) {
selected.setText(treasureList.get(position));
int i=treasureList.indexOf(selected);
clueOne=clue1List.get(i).toString();
clueTwo=clue2List.get(i).toString();
clueThree=clue3List.get(i).toString();
Button getClue = (Button)findViewById(R.id.getClueBtn);
getClue.setOnClickListener((OnClickListener) this);
}
public void OnClick(View v) throws IOException{
int buttonClicks = 3;
TextView clue1=(TextView)findViewById(R.id.clue1TxtView);
TextView clue2 = (TextView)findViewById(R.id.clue2TextView);
TextView clue3=(TextView)findViewById(R.id.clue3TextView);
if (buttonClicks == 3){
clue1.setText(clueOne);
buttonClicks=2;
}
else if (buttonClicks==2){
clue2.setText(clueTwo);
buttonClicks=1;
}
else if (buttonClicks==1){
clue3.setText(clueThree);
buttonClicks=0;
}
else if (buttonClicks==0)
Toast.makeText(getBaseContext(), "No more clues are available", Toast.LENGTH_LONG).show();
}
@Override
public void onNothingSelected(AdapterView<?> arg0) {
selected.setText("Please choose a treasure");
}
}
感谢我能得到的任何输入！
好的，我尝试了这样做，但收到错误：
09-15 16:33:47.439: E/AndroidRuntime(1440): FATAL EXCEPTION: main
09-15 16:33:47.439: E/AndroidRuntime(1440): java.lang.ArrayIndexOutOfBoundsException: length=12; index=-1
09-15 16:33:47.439: E/AndroidRuntime(1440): at java.util.ArrayList.get(ArrayList.java:310)
09-15 16:33:47.439: E/AndroidRuntime(1440): at com.rasmussen.geotreasuresgame.PlayGeoTreasureActivity.onItemSelected(PlayGeoTreasureActivity.java:182)
09-15 16:33:47.439: E/AndroidRuntime(1440): at android.widget.AdapterView.fireOnSelected(AdapterView.java:892)
09-15 16:33:47.439: E/AndroidRuntime(1440): at android.widget.AdapterView.access$200(AdapterView.java:49)
09-15 16:33:47.439: E/AndroidRuntime(1440): at android.widget.AdapterView$SelectionNotifier.run(AdapterView.java:860)
09-15 16:33:47.439: E/AndroidRuntime(1440): at android.os.Handler.handleCallback(Handler.java:730)
09-15 16:33:47.439: E/AndroidRuntime(1440): at android.os.Handler.dispatchMessage(Handler.java:92)
09-15 16:33:47.439: E/AndroidRuntime(1440): at android.os.Looper.loop(Looper.java:137)
09-15 16:33:47.439: E/AndroidRuntime(1440): at android.app.ActivityThread.main(ActivityThread.java:5103)
09-15 16:33:47.439: E/AndroidRuntime(1440): at java.lang.reflect.Method.invokeNative(Native Method)
09-15 16:33:47.439: E/AndroidRuntime(1440): at java.lang.reflect.Method.invoke(Method.java:525)
09-15 16:33:47.439: E/AndroidRuntime(1440): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:737)
09-15 16:33:47.439: E/AndroidRuntime(1440): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:553)
09-15 16:33:47.439: E/AndroidRuntime(1440): at dalvik.system.NativeStart.main(Native Method)
推荐答案
我在使用微调工具时也遇到了相同的错误(java.lang.ArrayIndexOutOf边界异常：长度=12；索引=-1)。在我的例子中，我试图在UI线程外部的微调函数上设置Adapter。在将相关代码包装在runOnUiThread中之后，问题就解决了。
这篇关于根据微调按钮选择显示其他数据的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！
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