我正在解析数据并将其显示在 textview 上。虽然我已经初始化了清单文件中的所有变量和必要的权限。我仍然收到致命错误。请看一下代码。提前致谢。
如果我使用 android 2.1 i.ie API-7 ..但是如果我用 android 4.0.3 ie API-15 替换它，应用程序将成功运行 ..它会抛出相同的 reeor ..正如我在 logcat 文件中提到的
主要活动
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.main);
View layout = findViewById(R.id.layout);
TextView id[];
TextView Name[];
TextView Email[];
TextView Address[];
try{
SAXParserFactory saxPF= SAXParserFactory.newInstance();
SAXParser saxP = saxPF.newSAXParser();
XMLReader xmlR = saxP.getXMLReader();
URL url = new URL("http://xyz");
XMLHandler myXMLHandler = new XMLHandler();
xmlR.setContentHandler(myXMLHandler);
xmlR.parse(new InputSource(url.openStream()));
}catch(Exception e){
e.printStackTrace();
}
data= XMLHandler.data;
id = new TextView[data.getId().size()];
Name = new TextView[data.getName().size()];
Email = new TextView[data.getEmail().size()];
for(int i=0 ; i <data.getName().size(); i++)
{
id[i] = new TextView (this);
id[i].setText("Id : " + data.getId().get(i));
Name[i] = new TextView(this);
Name[i].setText("Name : " + data.getName().get(i));
Email[i] = new TextView(this);
Email[i].setText("Email : " + data.getEmail().get(i));
((ViewGroup)layout).addView(id[i]);
((ViewGroup)layout).addView(Name[i]);
((ViewGroup)layout).addView(Email[i]);
}
XMLGettersSetters 类
public class XMLGettersSetters {
private ArrayList<String> id = new ArrayList<String>();
private ArrayList<String> Name = new ArrayList<String>();
private ArrayList<String> Email = new ArrayList<String>();
public ArrayList<String> getId(){
return id;
}
public void setId(String id){
this.id.add(id);
}
public ArrayList<String> getName(){
return Name;
}
public void setName(String name)
{
this.Name.add(name);
}
public ArrayList<String> getEmail(){
return Email;
}
public void setEmail(String email){
this.Email.add(email);
}
}
XMLHandler 类
public class XMLHandler extends DefaultHandler {
String elementValue= null;
Boolean elementOn = false;
public static XMLGettersSetters data = null;
public static XMLGettersSetters getXMLData(){
return data;
}
public static void setXMLData(XMLGettersSetters data)
{
XMLHandler.data=data;
}
public void startElement(String uri,String localName,String qName,Attributes attributes) throws SAXException{
elementOn=true;
if(localName.equals("ExaReceipts")){
data = new XMLGettersSetters();
}else if(localName.equals("Organisation")){
}
}
public void endElement(String uri,String localName,String qName)throws SAXException
{
elementOn = false;
if(localName.equalsIgnoreCase("id"))
data.setId(elementValue);
else if(localName.equalsIgnoreCase("Name"))
data.setName(elementValue);
else if(localName.equalsIgnoreCase("Email"))
data.setEmail(elementValue);
}
public void characters (char[] ch , int start , int length)throws SAXException
{
if(elementOn){
elementValue= new String(ch,start,length);
elementOn=false;
}
}
}
AndroidManifest.xml
<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
package="com.spinnertest1"
android:versionCode="1"
android:versionName="1.0" >
<uses-sdk android:minSdkVersion="15" />
<uses-permission android:name="android.permission.INTERNET" />"
<application
android:icon="@drawable/ic_launcher"
android:label="@string/app_name" >
<activity
android:name=".SpinnerTest1Activity"
android:label="@string/app_name" >
<intent-filter>
<action android:name="android.intent.action.MAIN" />
<category android:name="android.intent.category.LAUNCHER" />
</intent-filter>
</activity>
</application>
</manifest>
日志猫
06-26 17:41:38.482: W/dalvikvm(2129): threadid=1: thread exiting with uncaught exception (group=0x409c01f8)
06-26 17:41:38.492: E/AndroidRuntime(2129): FATAL EXCEPTION: main
06-26 17:41:38.492: E/AndroidRuntime(2129): java.lang.RuntimeException: Unable to start activity ComponentInfo{com.spinnertest1/com.spinnertest1.SpinnerTest1Activity}: java.lang.NullPointerException
06-26 17:41:38.492: E/AndroidRuntime(2129): at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:1956)
06-26 17:41:38.492: E/AndroidRuntime(2129): at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:1981)
06-26 17:41:38.492: E/AndroidRuntime(2129): at android.app.ActivityThread.access$600(ActivityThread.java:123)
06-26 17:41:38.492: E/AndroidRuntime(2129): at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1147)
06-26 17:41:38.492: E/AndroidRuntime(2129): at android.os.Handler.dispatchMessage(Handler.java:99)
06-26 17:41:38.492: E/AndroidRuntime(2129): at android.os.Looper.loop(Looper.java:137)
06-26 17:41:38.492: E/AndroidRuntime(2129): at android.app.ActivityThread.main(ActivityThread.java:4424)
06-26 17:41:38.492: E/AndroidRuntime(2129): at java.lang.reflect.Method.invokeNative(Native Method)
06-26 17:41:38.492: E/AndroidRuntime(2129): at java.lang.reflect.Method.invoke(Method.java:511)
06-26 17:41:38.492: E/AndroidRuntime(2129): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:784)
06-26 17:41:38.492: E/AndroidRuntime(2129): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:551)
06-26 17:41:38.492: E/AndroidRuntime(2129): at dalvik.system.NativeStart.main(Native Method)
06-26 17:41:38.492: E/AndroidRuntime(2129): Caused by: java.lang.NullPointerException
06-26 17:41:38.492: E/AndroidRuntime(2129): at com.spinnertest1.SpinnerTest1Activity.onCreate(SpinnerTest1Activity.java:58)
06-26 17:41:38.492: E/AndroidRuntime(2129): at android.app.Activity.performCreate(Activity.java:4465)
06-26 17:41:38.492: E/AndroidRuntime(2129): at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1049)
06-26 17:41:38.492: E/AndroidRuntime(2129): at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:1920)
06-26 17:41:38.492: E/AndroidRuntime(2129): ... 11 more