1
運行下面的代碼時我得到錯誤，指出應用程序意外停止...在我的logcat..it顯示如此之多的錯誤..我也附加了logcat錯誤，我有致命異常太.... 請幫助....在android中的xml解析錯誤，在運行時顯示致命異常
XMLdemo.java
package com.example.myfirstapplication;
import java.io.IOException;
import java.io.InputStream;
import java.util.ArrayList;
import java.util.Iterator;
import org.xmlpull.v1.XmlPullParser;
import org.xmlpull.v1.XmlPullParserException;
import org.xmlpull.v1.XmlPullParserFactory;
import android.app.Activity;
import android.os.Bundle;
import android.view.Menu;
import android.widget.TextView;
class Product
{
public String name;
public String quantity;
public String color;
}
public class XMLDemo extends Activity {
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.main);
XmlPullParserFactory pullParserFactory;
try {
pullParserFactory = XmlPullParserFactory.newInstance();
XmlPullParser parser = pullParserFactory.newPullParser();
InputStream in_s = getApplicationContext().getAssets().open("temp.xml");
parser.setFeature(XmlPullParser.FEATURE_PROCESS_NAMESPACES, false);
parser.setInput(in_s, null);
parseXML(parser);
} catch (XmlPullParserException e) {
e.printStackTrace();
} catch (IOException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
}
private void parseXML(XmlPullParser parser) throws XmlPullParserException,IOException
{
ArrayList<Product> products = null;
int eventType = parser.getEventType();
Product currentProduct = null;
while (eventType != XmlPullParser.END_DOCUMENT){
String name = null;
switch (eventType){
case XmlPullParser.START_DOCUMENT:
products = new ArrayList();
break;
case XmlPullParser.START_TAG:
name = parser.getName();
if (name == "product"){
currentProduct = new Product();
} else if (currentProduct != null){
if (name == "productname"){
currentProduct.name = parser.nextText();
} else if (name == "productcolor"){
currentProduct.color = parser.nextText();
} else if (name == "productquantity"){
currentProduct.quantity= parser.nextText();
}
}
break;
case XmlPullParser.END_TAG:
name = parser.getName();
if (name.equalsIgnoreCase("product") && currentProduct != null){
products.add(currentProduct);
}
}
eventType = parser.next();
}
printProducts(products);
}
private void printProducts(ArrayList<Product> products)
{
String content = "";
Iterator<Product> it = products.iterator();
while(it.hasNext())
{
Product currProduct = it.next();
content = content + "nnnProduct :" + currProduct.name + "n";
content = content + "Quantity :" + currProduct.quantity + "n";
content = content + "Color :" + currProduct.color + "n";
}
TextView display = (TextView)findViewById(R.id.info);
display.setText(content);
}
@Override
public boolean onCreateOptionsMenu(Menu menu) {
// Inflate the menu; this adds items to the action bar if it is present.
getMenuInflater().inflate(R.menu.main, menu);
return true;
}
}
我的佈局 main.xml中
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:orientation="vertical" >
<TextView
android:id="@+id/info"
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:padding="20dp"
android:text="TextView" />
</LinearLayout>
機器人的manifest.xml
<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
package="com.example.myfirstapplication"
android:versionCode="1"
android:versionName="1.0" >
<uses-sdk
android:minSdkVersion="8"
android:targetSdkVersion="17" />
<application
android:allowBackup="true"
android:icon="@drawable/ic_launcher"
android:label="@string/app_name"
android:theme="@style/AppTheme" >
<activity
android:name="com.example.myfirstapplication.MainActivity"
android:label="@string/app_name" >
<intent-filter>
<action android:name="android.intent.action.MAIN" />
<category android:name="android.intent.category.LAUNCHER" />
</intent-filter>
</activity>
<activity
android:name="com.example.myfirstapplication.Main2Activity"
android:label="@string/title_activity_main2" >
</activity>
</application>
</manifest>
logcat的錯誤，而RUNNING
09-29 19:55:21.378: D/AndroidRuntime(275): Shutting down VM
09-29 19:55:21.378: W/dalvikvm(275): threadid=1: thread exiting with uncaught exception (group=0x4001d800)
09-29 19:55:21.398: E/AndroidRuntime(275): FATAL EXCEPTION: main
09-29 19:55:21.398: E/AndroidRuntime(275): java.lang.RuntimeException: Unable to instantiate activity ComponentInfo{com.example.myfirstapplication/com.example.myfirstapplication.MainActivity}: java.lang.ClassNotFoundException: com.example.myfirstapplication.MainActivity in loader dalvik.system.PathClassLoader[/data/app/com.example.myfirstapplication-1.apk]
09-29 19:55:21.398: E/AndroidRuntime(275): at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2585)
09-29 19:55:21.398: E/AndroidRuntime(275): at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2679)
09-29 19:55:21.398: E/AndroidRuntime(275): at android.app.ActivityThread.access$2300(ActivityThread.java:125)
09-29 19:55:21.398: E/AndroidRuntime(275): at android.app.ActivityThread$H.handleMessage(ActivityThread.java:2033)
09-29 19:55:21.398: E/AndroidRuntime(275): at android.os.Handler.dispatchMessage(Handler.java:99)
09-29 19:55:21.398: E/AndroidRuntime(275): at android.os.Looper.loop(Looper.java:123)
09-29 19:55:21.398: E/AndroidRuntime(275): at android.app.ActivityThread.main(ActivityThread.java:4627)
09-29 19:55:21.398: E/AndroidRuntime(275): at java.lang.reflect.Method.invokeNative(Native Method)
09-29 19:55:21.398: E/AndroidRuntime(275): at java.lang.reflect.Method.invoke(Method.java:521)
09-29 19:55:21.398: E/AndroidRuntime(275): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:868)
09-29 19:55:21.398: E/AndroidRuntime(275): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:626)
09-29 19:55:21.398: E/AndroidRuntime(275): at dalvik.system.NativeStart.main(Native Method)
09-29 19:55:21.398: E/AndroidRuntime(275): Caused by: java.lang.ClassNotFoundException: com.example.myfirstapplication.MainActivity in loader dalvik.system.PathClassLoader[/data/app/com.example.myfirstapplication-1.apk]
09-29 19:55:21.398: E/AndroidRuntime(275): at dalvik.system.PathClassLoader.findClass(PathClassLoader.java:243)
09-29 19:55:21.398: E/AndroidRuntime(275): at java.lang.ClassLoader.loadClass(ClassLoader.java:573)
09-29 19:55:21.398: E/AndroidRuntime(275): at java.lang.ClassLoader.loadClass(ClassLoader.java:532)
09-29 19:55:21.398: E/AndroidRuntime(275): at android.app.Instrumentation.newActivity(Instrumentation.java:1021)
09-29 19:55:21.398: E/AndroidRuntime(275): at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2577)
09-29 19:55:21.398: E/AndroidRuntime(275): ... 11 more
09-29 20:12:36.938: D/AndroidRuntime(298): Shutting down VM
09-29 20:12:36.998: W/dalvikvm(298): threadid=1: thread exiting with uncaught exception (group=0x4001d800)
09-29 20:12:37.058: E/AndroidRuntime(298): FATAL EXCEPTION: main
09-29 20:12:37.058: E/AndroidRuntime(298): java.lang.RuntimeException: Unable to instantiate activity ComponentInfo{com.example.myfirstapplication/com.example.myfirstapplication.MainActivity}: java.lang.ClassNotFoundException: com.example.myfirstapplication.MainActivity in loader dalvik.system.PathClassLoader[/data/app/com.example.myfirstapplication-1.apk]
09-29 20:12:37.058: E/AndroidRuntime(298): at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2585)
09-29 20:12:37.058: E/AndroidRuntime(298): at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2679)
09-29 20:12:37.058: E/AndroidRuntime(298): at android.app.ActivityThread.access$2300(ActivityThread.java:125)
09-29 20:12:37.058: E/AndroidRuntime(298): at android.app.ActivityThread$H.handleMessage(ActivityThread.java:2033)
09-29 20:12:37.058: E/AndroidRuntime(298): at android.os.Handler.dispatchMessage(Handler.java:99)
09-29 20:12:37.058: E/AndroidRuntime(298): at android.os.Looper.loop(Looper.java:123)
09-29 20:12:37.058: E/AndroidRuntime(298): at android.app.ActivityThread.main(ActivityThread.java:4627)
09-29 20:12:37.058: E/AndroidRuntime(298): at java.lang.reflect.Method.invokeNative(Native Method)
09-29 20:12:37.058: E/AndroidRuntime(298): at java.lang.reflect.Method.invoke(Method.java:521)
09-29 20:12:37.058: E/AndroidRuntime(298): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:868)
09-29 20:12:37.058: E/AndroidRuntime(298): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:626)
09-29 20:12:37.058: E/AndroidRuntime(298): at dalvik.system.NativeStart.main(Native Method)
09-29 20:12:37.058: E/AndroidRuntime(298): Caused by: java.lang.ClassNotFoundException: com.example.myfirstapplication.MainActivity in loader dalvik.system.PathClassLoader[/data/app/com.example.myfirstapplication-1.apk]
09-29 20:12:37.058: E/AndroidRuntime(298): at dalvik.system.PathClassLoader.findClass(PathClassLoader.java:243)
09-29 20:12:37.058: E/AndroidRuntime(298): at java.lang.ClassLoader.loadClass(ClassLoader.java:573)
09-29 20:12:37.058: E/AndroidRuntime(298): at java.lang.ClassLoader.loadClass(ClassLoader.java:532)
09-29 20:12:37.058: E/AndroidRuntime(298): at android.app.Instrumentation.newActivity(Instrumentation.java:1021)
09-29 20:12:37.058: E/AndroidRuntime(298): at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2577)
09-29 20:12:37.058: E/AndroidRuntime(298): ... 11 more
不要使用==比較字符串。不確定這是全部問題，但是您的START_TAG案例會這樣做，這當然是錯誤的。 –
嘗試刷新項目的構建！它也給你ClassNotFoundException。 – ashu