2012-03-31 15 views
0

私はAndroid用のアプリケーションを作成しています。XMLファイルを読み込み、XMLからSpinnerに入れられたArrayListにデータを追加します。ここ はコードです:XMLの読み取り中にエラーが発生しました

package com.rezoluz.fsx_pocket; 

import java.util.ArrayList; 
import java.io.File; 
import java.io.FileInputStream; 
import java.io.IOException; 
import java.io.InputStreamReader; 
import org.xmlpull.v1.XmlPullParser; 
import org.xmlpull.v1.XmlPullParserException; 
import org.xmlpull.v1.XmlPullParserFactory; 

import android.os.Environment; 

public class Scanner extends Main { 

    public ArrayList<String> getCategorys() throws XmlPullParserException, IOException { 
     ArrayList<String> categorys = new ArrayList<String>(); 
     categorys.add("Please select a category"); 
     //START ADDING HERE 
     XmlPullParserFactory factory = XmlPullParserFactory.newInstance(); 
     factory.setNamespaceAware(true); 
     XmlPullParser parser = factory.newPullParser(); 
     File file = new File(Environment.getExternalStorageDirectory()+ "/fsx_kneeboard/categories.xml"); 
     FileInputStream fis = new FileInputStream(file); 
     parser.setInput(new InputStreamReader(fis)); 
     parser.next(); 
     int eventType = parser.getEventType(); 
     int Categories = 0; 
     while (eventType != XmlPullParser.END_DOCUMENT) { 
      if (eventType == XmlPullParser.START_TAG && parser.getName().equals("categories")) { 
       Categories++; 
      } if (eventType == XmlPullParser.START_TAG && parser.getName().equals("category") && Categories == 1) { 
       Categories++; 
      } if (eventType == XmlPullParser.START_TAG && parser.getName().equals("name") && Categories == 2) { 
       categorys.add(parser.getText()); 
      } 
      parser.next(); 
     } 
     return categorys; 

    } 
} 

そして、これは別のクラス(Shortcuts.java)である:

public boolean launched = false; 

Scanner scanner = new Scanner(); 
ArrayList<String> items; 
     try { 
      items = scanner.getCategorys(); 
     } catch (FileNotFoundException e) { 
      items = null; 
      e.printStackTrace(); 
     } catch (XmlPullParserException e) { 
      items = null; 
      e.printStackTrace(); 
     } catch (IOException e) { 
      items = null; 
      e.printStackTrace(); 
     } 
     @SuppressWarnings({ "unchecked", "rawtypes" }) 
     ArrayAdapter<CharSequence> adapter = new ArrayAdapter(this,android.R.layout.simple_spinner_item, items); 
     adapter.setDropDownViewResource(android.R.layout.simple_spinner_dropdown_item); 
     selection.setAdapter(adapter); 

     selection.setOnItemSelectedListener(new OnItemSelectedListener() { 

      public void onItemSelected(AdapterView<?> arg0, View arg1, int arg2, 
        long arg3) { 
       final String simulatorCommands = getString(R.string.Simulator_Commands); //Setting Shortcuts 
       final String controlSurfaceCommands = getString(R.string.Control_Surface_Commands); 
       TextView Text = (TextView)findViewById(R.id.shortcutsText); //Defining the TextView 
       Spinner selection = (Spinner) findViewById(R.id.shortcutsSpinner); //Defining the Spinner 
       String selText = selection.getSelectedItem().toString(); //Finding the text of the selected item, from the Spinner 
       //Setting the TextView to X. START 
       int selected = selection.getSelectedItemPosition(); 
       if (selected==0 && launched==true) { 
        selection.setSelection(prevSelection); 
        Context context = getApplicationContext(); 
        final String featureToast = getString(R.string.shortcuts_notValid); 
        CharSequence text = featureToast; 
        int duration = Toast.LENGTH_SHORT; 

        Toast toast = Toast.makeText(context, text, duration); 
        toast.show(); 
       } 
       launched = true; 
       if (selection.getSelectedItemPosition()!=0) { 
         prevSelection = selection.getSelectedItemPosition(); 
       } 
       if (selText.equals("Please select a category")) { 
        Text.setText(Html.fromHtml("Please select a category from the list above.")); 
       } 
       if (selText.equals("Simulator Commands")) { 
        Text.setText(Html.fromHtml(simulatorCommands)); 
       } 
       if (selText.equals("Control Surface Commands")) { 
        Text.setText(Html.fromHtml(controlSurfaceCommands)); 
       } 
       //END 

      } 

私がダウンして、私は必要だと思うものにコードをカットしました。ショートカットクラスを開くと強制的に閉じます。ここ はlogcatである:ここでは

> 03-31 17:53:12.340: D/AndroidRuntime(6625): Shutting down VM 03-31 
> 17:53:12.340: W/dalvikvm(6625): threadid=1: thread exiting with 
> uncaught exception (group=0x4001d7e8) 03-31 17:53:12.385: 
> E/AndroidRuntime(6625): FATAL EXCEPTION: main 03-31 17:53:12.385: 
> E/AndroidRuntime(6625): java.lang.RuntimeException: Unable to start 
> activity 
> ComponentInfo{com.rezoluz.fsx_pocket/com.rezoluz.fsx_pocket.Shortcuts}: 
> java.lang.NullPointerException 03-31 17:53:12.385: 
> E/AndroidRuntime(6625): at 
> android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2663) 
> 03-31 17:53:12.385: E/AndroidRuntime(6625): at 
> android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2679) 
> 03-31 17:53:12.385: E/AndroidRuntime(6625): at 
> android.app.ActivityThread.access$2300(ActivityThread.java:125) 03-31 
> 17:53:12.385: E/AndroidRuntime(6625):  at 
> android.app.ActivityThread$H.handleMessage(ActivityThread.java:2033) 
> 03-31 17:53:12.385: E/AndroidRuntime(6625): at 
> android.os.Handler.dispatchMessage(Handler.java:99) 03-31 
> 17:53:12.385: E/AndroidRuntime(6625):  at 
> android.os.Looper.loop(Looper.java:123) 03-31 17:53:12.385: 
> E/AndroidRuntime(6625): at 
> android.app.ActivityThread.main(ActivityThread.java:4627) 03-31 
> 17:53:12.385: E/AndroidRuntime(6625):  at 
> java.lang.reflect.Method.invokeNative(Native Method) 03-31 
> 17:53:12.385: E/AndroidRuntime(6625):  at 
> java.lang.reflect.Method.invoke(Method.java:521) 03-31 17:53:12.385: 
> E/AndroidRuntime(6625): at 
> com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:858) 
> 03-31 17:53:12.385: E/AndroidRuntime(6625): at 
> com.android.internal.os.ZygoteInit.main(ZygoteInit.java:616) 03-31 
> 17:53:12.385: E/AndroidRuntime(6625):  at 
> dalvik.system.NativeStart.main(Native Method) 03-31 17:53:12.385: 
> E/AndroidRuntime(6625): Caused by: java.lang.NullPointerException 
> 03-31 17:53:12.385: E/AndroidRuntime(6625): at 
> com.rezoluz.fsx_pocket.Scanner.getCategorys(Scanner.java:31) 03-31 
> 17:53:12.385: E/AndroidRuntime(6625):  at 
> com.rezoluz.fsx_pocket.Shortcuts.onCreate(Shortcuts.java:78) 03-31 
> 17:53:12.385: E/AndroidRuntime(6625):  at 
> android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1047) 
> 03-31 17:53:12.385: E/AndroidRuntime(6625): at 
> android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2627) 
> 03-31 17:53:12.385: E/AndroidRuntime(6625): ... 11 more 

は、読みしようとしているXMLファイルです:

<?xml version='1.0' encoding='UTF-8' standalone='yes' ?> 
<categories> 
    <category> 
    <name>Simulator Commands</name> 
    <id>1</id> 
    </category> 
    <category> 
    <name>Control Surface Commands</name> 
    <id>2</id> 
    </category> 
    <category> 
    <name>Control Surface Commands</name> 
    <id>3</id> 
    </category> 
    <category> 
    <name>General Aircraft Commands</name> 
    <id>4</id> 
    </category> 
    <category> 
    <name>Light Commands</name> 
    <id>5</id> 
    </category> 
    <category> 
    <name>Radio Commands</name> 
    <id>6</id> 
    </category> 
    <category> 
    <name>Autopilot Commands</name> 
    <id>7</id> 
    </category> 
    <category> 
    <name>Intrument Commands</name> 
    <id>8</id> 
    </category> 
    <category> 
    <name>View Commands</name> 
    <id>9</id> 
    </category> 
    <category> 
    <name>Slew Keys</name> 
    <id>10</id> 
    </category> 
    <category> 
    <name>Mission Commands</name> 
    <id>11</id> 
    </category> 
    <category> 
    <name>Multiplayer Commands</name> 
    <id>12</id> 
    </category> 
    <category> 
    <name>C172 Intrument Panels</name> 
    <id>13</id> 
    </category> 
    <category> 
    <name>BE58 Intrument Panels</name> 
    <id>14</id> 
    </category> 
</categories> 

お時間をありがとう、とヘルプ。 zeokila

+0

Shortcuts.java行番号78では、その行が何を構成するのかにエラーがあります – Ishu

答えて

1

あなたは31行でScanner.javaでNullPointerExceptionが持っている:

E/AndroidRuntime(6625): Caused by: java.lang.NullPointerException 
E/AndroidRuntime(6625): at com.rezoluz.fsx_pocket.Scanner.getCategorys(Scanner.java:31) 
0

、おそらく最良の解決策は、直列化のためにすでに利用可能なライブラリを使用することです。試してくださいhttp://simple.sourceforge.net/。私は個人的にこのライブラリを使用しており、本当にとても満足しています。

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