本文介紹了根據微調按鈕選擇顯示其他數據的處理方法，對大家解決問題具有一定的參考價值，需要的朋友們下面隨著小編來一起學習吧！
問題描述
我有一個XML文件，其中我在微調控制框中顯示了第一個標記(寶藏名稱)中的文本，以供用戶選擇。一旦選擇，我需要能夠訪問存儲在XML文檔(存儲在設備上的數據文件中)中的與所選寶藏名稱相關聯的其他數據。我已經解析了XML文件，并將每一項存儲在單獨的數組列表中。當用戶點擊一個按鈕(獲取線索)時，我需要能夠顯示與該寶藏相關的第一條線索。這個項目今天午夜前要交，這是我看起來拿不到的最后一件作品。任何幫助都將不勝感激。我添加了代碼以嘗試執行此操作：
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");
}
}
感謝我能得到的任何輸入！
好的，我嘗試了這樣做，但收到錯誤：
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)
推薦答案
我在使用微調工具時也遇到了相同的錯誤(java.lang.ArrayIndexOutOf邊界異常：長度=12；索引=-1)。在我的例子中，我試圖在UI線程外部的微調函數上設置Adapter。在將相關代碼包裝在runOnUiThread中之后，問題就解決了。
這篇關于根據微調按鈕選擇顯示其他數據的文章就介紹到這了，希望我們推薦的答案對大家有所幫助，
