我不知道为什么会发生强制关闭错误。
我想在我的 XML 布局中显示代码。但是，会发生强制关闭错误。我不确定它有什么问题。
这是我的 logcat 错误。
07-27 15:44:51.030: E/AndroidRuntime(6171): FATAL EXCEPTION: main
07-27 15:44:51.030: E/AndroidRuntime(6171): java.lang.RuntimeException: Unable to start activity ComponentInfo{com.example.fambond/com.example.fambond.MainActivity}: java.lang.IndexOutOfBoundsException: Invalid index 0, size is 0
07-27 15:44:51.030: E/AndroidRuntime(6171): at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:1651)
07-27 15:44:51.030: E/AndroidRuntime(6171): at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:1667)
07-27 15:44:51.030: E/AndroidRuntime(6171): at android.app.ActivityThread.access$1500(ActivityThread.java:117)
07-27 15:44:51.030: E/AndroidRuntime(6171): at android.app.ActivityThread$H.handleMessage(ActivityThread.java:935)
07-27 15:44:51.030: E/AndroidRuntime(6171): at android.os.Handler.dispatchMessage(Handler.java:99)
07-27 15:44:51.030: E/AndroidRuntime(6171): at android.os.Looper.loop(Looper.java:130)
07-27 15:44:51.030: E/AndroidRuntime(6171): at android.app.ActivityThread.main(ActivityThread.java:3691)
07-27 15:44:51.030: E/AndroidRuntime(6171): at java.lang.reflect.Method.invokeNative(Native Method)
07-27 15:44:51.030: E/AndroidRuntime(6171): at java.lang.reflect.Method.invoke(Method.java:507)
07-27 15:44:51.030: E/AndroidRuntime(6171): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:912)
07-27 15:44:51.030: E/AndroidRuntime(6171): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:670)
07-27 15:44:51.030: E/AndroidRuntime(6171): at dalvik.system.NativeStart.main(Native Method)
07-27 15:44:51.030: E/AndroidRuntime(6171): Caused by: java.lang.IndexOutOfBoundsException: Invalid index 0, size is 0
07-27 15:44:51.030: E/AndroidRuntime(6171): at java.util.ArrayList.throwIndexOutOfBoundsException(ArrayList.java:257)
07-27 15:44:51.030: E/AndroidRuntime(6171): at java.util.ArrayList.get(ArrayList.java:311)
07-27 15:44:51.030: E/AndroidRuntime(6171): at com.example.fambond.MainActivity.onCreate(MainActivity.java:144)
07-27 15:44:51.030: E/AndroidRuntime(6171): at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1050)
07-27 15:44:51.030: E/AndroidRuntime(6171): at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:1615)
MainActivity.java
public class MainActivity extends Activity {
ArrayList<String> psi;
public TextView psi_text;
TextView weather;
ImageView image;
private static Handler mHandler = new Handler();
class MyWeather{
String conditiontext;
String conditiontemp;
String conditiondate;
public String forecastToString(){
return
conditiontext + "\n" + " " + conditiontemp + "°C" ;
}
}
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
weather = (TextView)findViewById(R.id.weather);
image = (ImageView)findViewById(R.id.image);
psi = new ArrayList<String>();
psi_text = (TextView) findViewById(R.id.psi_text);
try {
URL url = new URL(
"http://app2.nea.gov.sg/data/rss/nea_psi.xml");
DocumentBuilderFactory dbf = DocumentBuilderFactory.newInstance();
DocumentBuilder db = dbf.newDocumentBuilder();
Document doc = db.parse(new InputSource(url.openStream()));
doc.getDocumentElement().normalize();
NodeList nodeList = doc.getElementsByTagName("item");
for (int i = 0; i < nodeList.getLength(); i++) {
Node node = nodeList.item(i);
Element fstElmnt = (Element) node;
NodeList websiteList = fstElmnt.getElementsByTagName("psi");
Element websiteElement = (Element) websiteList.item(0);
websiteList = websiteElement.getChildNodes();
psi.add(""+ ((Node) websiteList.item(0)).getNodeValue());
}
} catch (Exception e) {
System.out.println("XML Pasing Excpetion = " + e);
}
String temp = Html.fromHtml(psi.get(0)).toString();
String a[] = temp.split("\\)");
psi_text.setText(""+a[0]+")");
Thread myThread = new Thread(new Runnable(){
@Override
public void run() {
String weatherString = QueryYahooWeather();
Document weatherDoc = convertStringToDocument(weatherString);
final MyWeather weatherResult = parseWeather(weatherDoc);
runOnUiThread(new Runnable(){
@Override
public void run() {
weather.setText(weatherResult.forecastToString());
}});
}});
myThread.start();
}
private MyWeather parseWeather(Document srcDoc){
MyWeather myWeather = new MyWeather();
//<yweather:condition.../>
Node conditionNode = srcDoc.getElementsByTagName("yweather:condition").item(0);
String weatherCode = conditionNode.getAttributes()
.getNamedItem("code")
.getNodeValue()
.toString();
// thunderstorms
if(weatherCode.equals("4")){
mHandler.post(new Runnable() {
@Override
public void run() {
// This gets executed on the UI thread so it can safely modify
// Views
image.setImageResource(R.drawable.thunderstorm);
}
});
}
//isolated thunderstorms
else if ( weatherCode.equals("37")) {
mHandler.post(new Runnable() {
@Override
public void run() {
image.setImageResource(R.drawable.thunderstorm);
}
});
}
//scattered thunderstorms
else if ( weatherCode.equals("38")) {
mHandler.post(new Runnable() {
@Override
public void run() {
image.setImageResource(R.drawable.thunderstorm);
}
});
}
//scattered thunderstorms
else if ( weatherCode.equals("39")) {
mHandler.post(new Runnable() {
@Override
public void run() {
image.setImageResource(R.drawable.thunderstorm);
}
});
}
//thundershowers
else if ( weatherCode.equals("45")) {
mHandler.post(new Runnable() {
@Override
public void run() {
image.setImageResource(R.drawable.thunderstorm);
}
});
}
//isolated thundershowers
else if ( weatherCode.equals("47")) {
mHandler.post(new Runnable() {
@Override
public void run() {
image.setImageResource(R.drawable.thunderstorm);
}
});
}
//drizzle
else if ( weatherCode.equals("9")) {
mHandler.post(new Runnable() {
@Override
public void run() {
image.setImageResource(R.drawable.rainy);
}
});
}
//showers
else if ( weatherCode.equals("11")) {
mHandler.post(new Runnable() {
@Override
public void run() {
image.setImageResource(R.drawable.rainy);
}
});
}
//showers
else if ( weatherCode.equals("12")) {
mHandler.post(new Runnable() {
@Override
public void run() {
image.setImageResource(R.drawable.rainy);
}
});
}
//scattered showers
else if ( weatherCode.equals("40")) {
mHandler.post(new Runnable() {
@Override
public void run() {
image.setImageResource(R.drawable.rainy);
}
});
}
//hail
else if ( weatherCode.equals("17")) {
mHandler.post(new Runnable() {
@Override
public void run() {
image.setImageResource(R.drawable.hail);
}
});
}
//mixed rain and hail
else if ( weatherCode.equals("35")) {
mHandler.post(new Runnable() {
@Override
public void run() {
image.setImageResource(R.drawable.hail);
}
});
}
//foggy
else if ( weatherCode.equals("20")) {
mHandler.post(new Runnable() {
@Override
public void run() {
image.setImageResource(R.drawable.foggy);
}
});
}
//haze
else if ( weatherCode.equals("21")) {
mHandler.post(new Runnable() {
@Override
public void run() {
image.setImageResource(R.drawable.foggy);
}
});
}
//smoky
else if ( weatherCode.equals("22")) {
mHandler.post(new Runnable() {
@Override
public void run() {
image.setImageResource(R.drawable.foggy);
}
});
}
//windy
else if ( weatherCode.equals("24")) {
mHandler.post(new Runnable() {
@Override
public void run() {
image.setImageResource(R.drawable.windy);
}
});
}
//cloudy
else if ( weatherCode.equals("26")) {
mHandler.post(new Runnable() {
@Override
public void run() {
image.setImageResource(R.drawable.cloudy);
}
});
}
//fair (night)
else if ( weatherCode.equals("33")) {
mHandler.post(new Runnable() {
@Override
public void run() {
image.setImageResource(R.drawable.cloudy);
}
});
}
//fair (day)
else if ( weatherCode.equals("34")) {
mHandler.post(new Runnable() {
@Override
public void run() {
image.setImageResource(R.drawable.cloudy);
}
});
}
//partly cloudy
else if ( weatherCode.equals("44")) {
mHandler.post(new Runnable() {
@Override
public void run() {
image.setImageResource(R.drawable.cloudy);
}
});
}
//mostly cloudy (night)
else if ( weatherCode.equals("27")) {
mHandler.post(new Runnable() {
@Override
public void run() {
image.setImageResource(R.drawable.night_cloudy);
}
});
}
//partly cloudy (night)
else if ( weatherCode.equals("29")) {
mHandler.post(new Runnable() {
@Override
public void run() {
image.setImageResource(R.drawable.night_cloudy);
}
});
}
//mostly cloudy (day)
else if ( weatherCode.equals("28")) {
mHandler.post(new Runnable() {
@Override
public void run() {
image.setImageResource(R.drawable.day_cloudy);
}
});
}
//partly cloudy (day)
else if ( weatherCode.equals("30")) {
mHandler.post(new Runnable() {
@Override
public void run() {
image.setImageResource(R.drawable.day_cloudy);
}
});
}
//clear(night)
else if ( weatherCode.equals("31")) {
mHandler.post(new Runnable() {
@Override
public void run() {
image.setImageResource(R.drawable.moon);
}
});
}
//sunny
else {
mHandler.post(new Runnable() {
@Override
public void run() {
image.setImageResource(R.drawable.sunny);
}
});
}
myWeather.conditiontext = conditionNode.getAttributes()
.getNamedItem("text")
.getNodeValue()
.toString();
myWeather.conditiontemp = conditionNode.getAttributes()
.getNamedItem("temp")
.getNodeValue()
.toString();
return myWeather;
}
private Document convertStringToDocument(String src){
Document dest = null;
DocumentBuilderFactory dbFactory =
DocumentBuilderFactory.newInstance();
DocumentBuilder parser;
try {
parser = dbFactory.newDocumentBuilder();
dest = parser.parse(new ByteArrayInputStream(src.getBytes()));
} catch (ParserConfigurationException e1) {
e1.printStackTrace();
Toast.makeText(MainActivity.this,
e1.toString(), Toast.LENGTH_LONG).show();
} catch (SAXException e) {
e.printStackTrace();
Toast.makeText(MainActivity.this,
e.toString(), Toast.LENGTH_LONG).show();
} catch (IOException e) {
e.printStackTrace();
Toast.makeText(MainActivity.this,
e.toString(), Toast.LENGTH_LONG).show();
}
return dest;
}
private String QueryYahooWeather(){
String qResult = "";
String queryString = "http://weather.yahooapis.com/forecastrss?w=1062617&u=c";
HttpClient httpClient = new DefaultHttpClient();
HttpGet httpGet = new HttpGet(queryString);
try {
HttpEntity httpEntity = httpClient.execute(httpGet).getEntity();
if (httpEntity != null){
InputStream inputStream = httpEntity.getContent();
Reader in = new InputStreamReader(inputStream);
BufferedReader bufferedreader = new BufferedReader(in);
StringBuilder stringBuilder = new StringBuilder();
String stringReadLine = null;
while ((stringReadLine = bufferedreader.readLine()) != null) {
stringBuilder.append(stringReadLine + "\n");
}
qResult = stringBuilder.toString();
}
} catch (ClientProtocolException e) {
e.printStackTrace();
Toast.makeText(MainActivity.this,
e.toString(), Toast.LENGTH_LONG).show();
} catch (IOException e) {
e.printStackTrace();
Toast.makeText(MainActivity.this,
e.toString(), Toast.LENGTH_LONG).show();
}
return qResult;
}
}
activity_main.xml
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="fill_parent"
android:layout_height="fill_parent"
android:orientation="vertical"
android:paddingBottom="@dimen/activity_vertical_margin"
android:paddingLeft="@dimen/activity_horizontal_margin"
android:paddingRight="@dimen/activity_horizontal_margin"
android:paddingTop="@dimen/activity_vertical_margin"
tools:context=".MainActivity" >
<Button
android:id="@+id/button1"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignLeft="@+id/checkBox6"
android:layout_alignParentBottom="true"
android:layout_alignParentRight="true"
android:text="Recommended" />
<CheckBox
android:id="@+id/checkBox6"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignBaseline="@+id/checkBox3"
android:layout_alignBottom="@+id/checkBox3"
android:layout_alignParentRight="true"
android:text="Neighbourhood" />
<CheckBox
android:id="@+id/checkBox4"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignBaseline="@+id/checkBox1"
android:layout_alignBottom="@+id/checkBox1"
android:layout_alignLeft="@+id/checkBox5"
android:text="Museum" />
<CheckBox
android:id="@+id/checkBox3"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_above="@+id/button1"
android:layout_alignParentLeft="true"
android:layout_marginBottom="54dp"
android:text="Sports" />
<EditText
android:id="@+id/editText1"
android:layout_width="182dp"
android:layout_height="wrap_content"
android:layout_above="@+id/checkBox4"
android:layout_alignLeft="@+id/checkBox1"
android:layout_marginBottom="22dp"
android:ems="10" />
<TextView
android:id="@+id/textView1"
android:layout_width="78dp"
android:layout_height="wrap_content"
android:layout_above="@+id/editText1"
android:layout_alignLeft="@+id/editText1"
android:text="Location:" />
<CheckBox
android:id="@+id/checkBox1"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_above="@+id/checkBox2"
android:layout_alignLeft="@+id/checkBox2"
android:layout_marginBottom="20dp"
android:text="Education" />
<CheckBox
android:id="@+id/checkBox2"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_above="@+id/checkBox3"
android:layout_alignLeft="@+id/checkBox3"
android:layout_marginBottom="18dp"
android:text="Festival" />
<CheckBox
android:id="@+id/checkBox5"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignLeft="@+id/checkBox6"
android:layout_below="@+id/checkBox1"
android:text="Performing Arts" />
<Button
android:id="@+id/button2"
style="?android:attr/buttonStyleSmall"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignBottom="@+id/button1"
android:layout_alignLeft="@+id/checkBox3"
android:layout_alignRight="@+id/imageView1"
android:text="By Month" />
<ImageView
android:id="@+id/imageView1"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignBottom="@+id/textView4"
android:layout_alignLeft="@+id/textView1"
android:layout_alignParentTop="true"
android:layout_alignRight="@+id/checkBox1"
android:layout_marginRight="16dp"
android:src="@drawable/logo" />
<ImageView
android:id="@+id/image"
android:layout_width="60dp"
android:layout_height="60dp"
android:layout_alignParentRight="true"
android:layout_above="@+id/weather"
android:layout_marginLeft="235dp"
/>
<TextView
android:id="@+id/weather"
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:layout_alignBottom="@+id/imageView1"
android:layout_alignRight="@+id/checkBox5"
android:layout_marginLeft="29dp"
android:layout_toRightOf="@+id/editText1"
android:textColor="#000000" />
<TextView
android:id="@+id/psi_text"
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:layout_above="@+id/textView1"
android:layout_alignRight="@+id/weather"
android:layout_marginLeft="26dp"
android:layout_toRightOf="@+id/editText1"
android:textColor="#000000" />
</RelativeLayout>