Java parseInt和viewflipper布局问题
我的Java parseInt和viewflipper布局问题,java,android,xml-parsing,viewflipper,parseint,Java,Android,Xml Parsing,Viewflipper,Parseint,我的parseInt（）有问题，它抛出错误：无法将“null”解析为整数，而且我的ViewFlipper也不工作。以下是我的活动： import javax.xml.parsers.SAXParser; import javax.xml.parsers.SAXParserFactory; import org.xml.sax.InputSource; import org.xml.sax.XMLReader; import android.app.Ac
parseInt（）ViewFlipper import javax.xml.parsers.SAXParser;
import javax.xml.parsers.SAXParserFactory;
import org.xml.sax.InputSource;
import org.xml.sax.XMLReader;
import android.app.Activity;
import android.graphics.Color;
import android.os.Bundle;
import android.util.Log;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.Button;
import android.widget.LinearLayout;
import android.widget.TextView;
import android.widget.ViewFlipper;
import xml.parser.dataset;
public class XmlParserActivity extends Activity implements OnClickListener {
private final String MY_DEBUG_TAG = "WeatherForcaster";
// private dataset myDataSet;
private LinearLayout layout;
private int temp= 0;
/** Called when the activity is first created. */
//the ViewSwitcher
private Button btn;
private ViewFlipper flip;
// private TextView tv;
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.main);
layout=(LinearLayout)findViewById(R.id.linearlayout1);
btn=(Button)findViewById(R.id.btn);
btn.setOnClickListener(this);
flip=(ViewFlipper)findViewById(R.id.flip);
//when a view is displayed
flip.setInAnimation(this,android.R.anim.fade_in);
//when a view disappears
flip.setOutAnimation(this, android.R.anim.fade_out);
// String postcode = null;
// public String getPostcode {
// return postcode;
// }
//URL newUrl = c;
// myweather.setText(c.toString());
/* Create a new TextView to display the parsingresult later. */
TextView tv = new TextView(this);
// run(0);
//WeatherApplicationActivity postcode = new WeatherApplicationActivity();
try {
/* Create a URL we want to load some xml-data from. */
URL url = new URL("http://new.myweather2.com/developer/forecast.ashx?uac=gcV3ynNdoV&output=xml&query=G41");
//String url = new String("http://new.myweather2.com/developer/forecast.ashx?uac=gcV3ynNdoV&output=xml&query="+WeatherApplicationActivity.postcode );
//URL url = new URL(url);
//url.toString( );
//myString(url.toString() + WeatherApplicationActivity.getString(postcode));
// url + WeatherApplicationActivity.getString(postcode);
/* Get a SAXParser from the SAXPArserFactory. */
SAXParserFactory spf = SAXParserFactory.newInstance();
SAXParser sp = spf.newSAXParser();
/* Get the XMLReader of the SAXParser we created. */
XMLReader xr = sp.getXMLReader();
/* Create a new ContentHandler and apply it to the XML-Reader*/
handler myHandler = new handler();
xr.setContentHandler(myHandler);
/* Parse the xml-data from our URL. */
xr.parse(new InputSource(url.openStream()));
/* Parsing has finished. */
/* Our ExampleHandler now provides the parsed data to us. */
dataset parsedDataSet =
myHandler.getParsedData();
/* Set the result to be displayed in our GUI. */
tv.setText(parsedDataSet.toString());
} catch (Exception e) {
/* Display any Error to the GUI. */
tv.setText("Error: " + e.getMessage());
Log.e(MY_DEBUG_TAG, "WeatherQueryError", e);
}
temp = Integer.parseInt(xml.parser.dataset.getTemp());
if(temp <0){
//layout.setBackgroundColor(Color.BLUE);
//layout.setBackgroundColor(getResources().getColor(R.color.silver));
findViewById(R.id.flip).setBackgroundColor(Color.BLUE);
}
else if(temp > 0 && temp < 9)
{
//layout.setBackgroundColor(Color.GREEN);
//layout.setBackgroundColor(getResources().getColor(R.color.silver));
findViewById(R.id.flip).setBackgroundColor(Color.GREEN);
}
else
{
//layout.setBackgroundColor(Color.YELLOW);
//layout.setBackgroundColor(getResources().getColor(R.color.silver));
findViewById(R.id.flip).setBackgroundColor(Color.YELLOW);
}
/* Display the TextView. */
this.setContentView(tv);
}
@Override
public void onClick(View arg0) {
// TODO Auto-generated method stub onClick(View arg0) {
// TODO Auto-generated method stub
flip.showNext();
//specify flipping interval
//flip.setFlipInterval(1000);
//flip.startFlipping();
}
}
public void characters(char ch[], int start, int length) {
if(this.in_temp){
String setTemp = new String(ch, start, length);
// myParsedDataSet.setTempUnit(new String(ch, start, length));
// myParsedDataSet.setTemp;
}
datasettempViewFlippermain.xml<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:orientation="vertical"
android:layout_width="fill_parent"
android:layout_height="fill_parent"
android:id="@+id/linearlayout1"
>
<TextView
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:textSize="25dip"
android:text="Flip Example"
/>
<TextView
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:textSize="25dip"
android:id="@+id/tv"
/>
<Button
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:textSize="25dip"
android:text="Flip"
android:id="@+id/btn"
android:onClick="ClickHandler"
/>
<ViewFlipper
android:layout_width="fill_parent"
android:layout_height="fill_parent"
android:id="@+id/flip">
<LinearLayout
android:orientation="vertical"
android:layout_width="fill_parent"
android:layout_height="fill_parent"
>
<TextView
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:textSize="25dip"
android:text="Item1a"
/>
</LinearLayout>
<TextView
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:textSize="25dip"
android:id="@+id/tv2"
/>
</ViewFlipper>
</LinearLayout>
现在，您正试图将其解析为
intnulldatasetnulltempnullinttemp = Integer.parseInt(xml.parser.dataset.getTemp());
parsedDataSet temp = Integer.parseInt(parsedDataSet.getTemp());
//....
dataset parsedDataSet;
try {
URL url = new URL(
"http://new.myweather2.com/developer/forecast.ashx?uac=gcV3ynNdoV&output=xml&query=G41");
SAXParserFactory spf = SAXParserFactory.newInstance();
SAXParser sp = spf.newSAXParser();
XMLReader xr = sp.getXMLReader();
handler myHandler = new handler();
xr.setContentHandler(myHandler);
xr.parse(new InputSource(url.openStream()));
parsedDataSet = myHandler.getParsedData();
tv.setText(parsedDataSet.toString());
} catch (Exception e) {
tv.setText("Error: " + e.getMessage());
Log.e(MY_DEBUG_TAG, "WeatherQueryError", e);
}
temp = Integer.parseInt(parsedDataSet.getTemp());
//...
// I guess that myParsedDataSet is another dataset object that you return with
// myHandler.getParsedData(), do you set the temp variable in that class?? // myParsedDataSet.setTemp(setTemp);
if(this.in_temp){
String setTemp = new String(ch, start, length);
// myParsedDataSet.setTempUnit(new String(ch, start, length));
// myParsedDataSet.setTemp;
}
-您还可以解析xml，检查
parseIntthis.setContentView（tv）替换活动的主布局 检查您的parseddataset
是否为空，如果为空，请在字符串的from中添加“0”，然后将其作为整数进行赋值
可按以下方式实施：
String checknull=parseddataset.toString();
if(checknull.length()==0)
checknull += "0";
我建议使用boolean
变量，如果它的结果为false（！=0），则只解析它，否则您知道它的parseddataset为空。在您使用xml.parser.dataset.getTemp（）的情况下
检查其长度是否为0，如果为false，则进行解析。@user1234167如果您的代码parsedDataSet
是dataset
的一个实例，则有以下行：dataset parsedDataSet=myHandler.getParsedData（）所以调用该方法应该不会有问题。在输入try catch
块之前，先声明您的parsedDataSet
，然后在该块中只将结果分配给parsedDataSet
。您能给我一个示例，说明我是如何声明我真的感到困惑的吗？我已经做出了更改，但仍然收到相同的错误：（至于将主布局替换为文本视图……为指出这一点，我将把它改为setText或something@user1234167您是否还修改了处理程序中的characters
方法来设置文本myParsedDataSet.settep（settep）；
？@user1234167您可能希望从视图翻转器（使用findViewById
）中获取一个文本视图
，并在其上设置天气文本（您解析的）。事实上，我刚刚更改了这个：静态字符串temp=“0”；它现在上升为0度，很明显，它现在将显示0，因为你将temp设置为static，等于“0”，只要做这个更改String temp=0
，如果它将从解析器中读取任何内容，那么0
将被解析值
替换，否则它将仅为0
。因此，如果你仍然得到0
这意味着文件没有被解析。很抱歉，我没有注意到之前的temp声明，否则会给出将字符串temp初始化为0的答案。无论如何，这个String temp=0
应该可以解决这个问题。注意：我现在已经让它工作了，我仍然将它声明为静态字符串，但是…它将我的数据作为co读取lor已经根据温度而改变。我的布局现在已经出现。现在的问题是我的数据已经消失了
// I guess that myParsedDataSet is another dataset object that you return with
// myHandler.getParsedData(), do you set the temp variable in that class?? // myParsedDataSet.setTemp(setTemp);
if(this.in_temp){
String setTemp = new String(ch, start, length);
// myParsedDataSet.setTempUnit(new String(ch, start, length));
// myParsedDataSet.setTemp;
}
String checknull=parseddataset.toString();
if(checknull.length()==0)
checknull += "0";