android 编程 9.3.2
今天我把android studio升级为3.0了，要与时俱进嘛~（主要是手点错了升级框{:5_100:} ）可能代码跟以前版本稍有不同。还是接着做上一个项目，在mainactivity.java旁新建个ContentHandler.java文件package com.example.xinwei.networktest;import android.util.Log;
import org.xml.sax.Attributes;
import org.xml.sax.SAXException;
import org.xml.sax.helpers.DefaultHandler;
/**
* Created by xinwei on 2017/11/4.
*/
public class ContentHandler extends DefaultHandler {
private static final String TAG = "ContentHandler";
private String nodeName;
private StringBuilder id;
private StringBuilder name;
private StringBuilder version;
@Override
public void startDocument() throws SAXException {
super.startDocument();
id=new StringBuilder();
name=new StringBuilder();
version=new StringBuilder();
}
@Override
public void startElement(String uri, String localName, String qName, Attributes attributes) throws SAXException {
super.startElement(uri, localName, qName, attributes);
nodeName=localName;
}
@Override
public void characters(char[] ch, int start, int length) throws SAXException {
super.characters(ch, start, length);
if ("id".equals(nodeName)){
id.append(ch,start,length);
}else if ("name".equals(nodeName)){
name.append(ch,start,length);
}else if ("version".equals(nodeName)){
version.append(ch,start,length);
}
}
@Override
public void endElement(String uri, String localName, String qName) throws SAXException {
super.endElement(uri, localName, qName);
if ("app".equals(localName)){
Log.d(TAG,"id is"+id.toString().trim());
Log.d(TAG,"name is"+name.toString().trim());
Log.d(TAG,"version is"+version.toString().trim());
id.setLength(0);
name.setLength(0);
version.setLength(0);
}
}
@Override
public void endDocument() throws SAXException {
super.endDocument();
}
}
然后修改mainactivity.javapackage com.example.xinwei.networktest;
import android.app.DownloadManager;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.util.Log;
import android.view.View;
import android.widget.Button;
import android.widget.TextView;
import org.xml.sax.InputSource;
import org.xml.sax.SAXException;
import org.xml.sax.XMLReader;
import org.xmlpull.v1.XmlPullParser;
import org.xmlpull.v1.XmlPullParserException;
import org.xmlpull.v1.XmlPullParserFactory;
import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStream;
import java.io.InputStreamReader;
import java.io.StringReader;
import java.net.HttpURLConnection;
import java.net.MalformedURLException;
import java.net.URL;
import java.net.URLDecoder;
import java.net.URLEncoder;
import javax.xml.parsers.ParserConfigurationException;
import javax.xml.parsers.SAXParserFactory;
import okhttp3.OkHttpClient;
import okhttp3.Request;
import okhttp3.Response;
public class MainActivity extends AppCompatActivity implements View.OnClickListener{
private static final String TAG = "MainActivity";
TextView responseText;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
Button sendRequest = (Button)findViewById(R.id.send_request);
responseText = (TextView)findViewById(R.id.response_text);
sendRequest.setOnClickListener(this);
}
@Override
public void onClick(View view) {
if (view.getId()==R.id.send_request){
//sendRequestWithHttpURLConnection();
sendRequestWithOkHttp();
}
}
private void sendRequestWithOkHttp() {
new Thread(){
@Override
public void run(){
OkHttpClient client = new OkHttpClient();
Request request = new Request.Builder().url("http://192.168.56.1/get_data.xml").build();
try {
Response response = client.newCall(request).execute();
String responseData = response.body().string();
parseXMLWithSAX(responseData);
//parseXMLWithPull(responseData);
//showResponse(responseData);
} catch (IOException e) {
e.printStackTrace();
}
}
}.start();
}
private void parseXMLWithSAX(String responseData) {
SAXParserFactory factory = SAXParserFactory.newInstance();
try {
XMLReader xmlReader=factory.newSAXParser().getXMLReader();
ContentHandler contentHandler=new ContentHandler();
xmlReader.setContentHandler(contentHandler);
xmlReader.parse(new InputSource(new StringReader(responseData)));
} catch (ParserConfigurationException e) {
e.printStackTrace();
} catch (SAXException e) {
e.printStackTrace();
} catch (IOException e) {
e.printStackTrace();
}
}
private void parseXMLWithPull(String responseData) {
try {
XmlPullParserFactory factory = XmlPullParserFactory.newInstance();
XmlPullParser xmlPullParser = factory.newPullParser();
xmlPullParser.setInput(new StringReader(responseData));
int eventType = xmlPullParser.getEventType();
String id="";
String name="";
String version="";
while (eventType!=XmlPullParser.END_DOCUMENT){
String nodeName=xmlPullParser.getName();
switch (eventType){
case XmlPullParser.START_TAG:
if ("id".equals(nodeName)){
id=xmlPullParser.nextText();
}else if ("name".equals(nodeName)){
name=xmlPullParser.nextText();
}else if ("version".equals(nodeName)){
version=xmlPullParser.nextText();
}
break;
case XmlPullParser.END_TAG:
if ("app".equals(nodeName)){
Log.d(TAG,"id is"+id);
Log.d(TAG,"name is"+name);
Log.d(TAG,"version is"+version);
}
break;
default:
break;
}
eventType=xmlPullParser.next();
}
} catch (XmlPullParserException e) {
e.printStackTrace();
} catch (IOException e) {
e.printStackTrace();
}
}
private void sendRequestWithHttpURLConnection() {
new Thread() {
@Override
public void run() {
HttpURLConnection connection = null;
BufferedReader reader=null;
try {
URL url = new URL("http://www.fishC.com");
connection = (HttpURLConnection)url.openConnection();
connection.setRequestMethod("GET");
connection.setRequestProperty("Content-type", "application/x-java-serialized-object");
Log.d("MainActivity", ""+connection.getResponseCode());
connection.setConnectTimeout(8000);
connection.setReadTimeout(8000);
InputStream in = connection.getInputStream();
reader=new BufferedReader(new InputStreamReader(in));
StringBuilder response=new StringBuilder();
String line;
while ((line=reader.readLine())!=null){
response.append(line);
}
showResponse(response.toString());
} catch (MalformedURLException e) {
e.printStackTrace();
} catch (IOException e) {
e.printStackTrace();
}finally {
if(reader!=null){
try {
reader.close();
} catch (IOException e) {
e.printStackTrace();
}
}
if (connection!=null){
connection.disconnect();
}
}
}
}.start();
}
private void showResponse(final String response) {
runOnUiThread(new Runnable() {
@Override
public void run() {
responseText.setText(response);
}
});
}
}
先启动apache服务器，然后运行程序跟模拟器，点击模拟器上按钮。在底下logcat里就学会显示内容，效果图：
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