最近学习Android的时候遇到些奇怪的问题,版本3.N和4.N使用不了HttpClient功能

Alfredknox 2013-07-22 04:23:38
我最近开发了一个Android项目,但只能用于2.N的平台上,而3.N和4.N都不能使用,我建的项目是最小支持2.N,目标4.2.2,最终编译也是4.2.2,配置文件也设置了权限,安装没有问题,就是使用不了Android的SDK的HttpClient这个功能,执行到execute就会出错!希望各位牛人能提供点意见!
AndroidManifest.xml
    <uses-sdk
android:minSdkVersion="8"
android:targetSdkVersion="17" />

<uses-permission android:name="android.permission.INTERNET" />
<uses-permission android:name="android.permission.ACCESS_NETWORK_STATE" />
<uses-permission android:name="android.permission.ACCESS_WIFI_STATE" />
<uses-permission android:name="android.permission.WRITE_SETTINGS" />
<uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE" />
<uses-permission android:name="android.permission.MOUNT_UNMOUNT_FILESYSTEMS" />

package UtilityBundle;

import java.io.ByteArrayOutputStream;
import java.io.IOException;
import java.io.InputStream;
import java.io.OutputStream;
import java.net.HttpURLConnection;
import java.net.URL;
import java.util.ArrayList;
import java.util.List;

import org.apache.http.HttpResponse;
import org.apache.http.NameValuePair;
import org.apache.http.client.HttpClient;
import org.apache.http.client.entity.UrlEncodedFormEntity;
import org.apache.http.client.methods.HttpGet;
import org.apache.http.client.methods.HttpPost;
import org.apache.http.client.params.HttpClientParams;
import org.apache.http.entity.StringEntity;
import org.apache.http.impl.client.DefaultHttpClient;
import org.apache.http.message.BasicNameValuePair;
import org.apache.http.params.BasicHttpParams;
import org.apache.http.params.HttpConnectionParams;
import org.apache.http.params.HttpParams;
import org.apache.http.params.HttpProtocolParams;
import org.apache.http.protocol.HTTP;
import org.apache.http.util.EntityUtils;
import org.json.JSONObject;

import android.util.Log;

public class WcfHelper
{
private static String UrlString = "http://";
private static final String UTag = "/";
private static final String USvcSuffix = ".svc";
/*
* http://ServerAddress/SvcFileName/ServerMethod?Param1=Val1¶m2=Val2
* @param:
* ServerAddress:192.168.1.198/ACWcfService
* SvcFileName:AccountService
* ServerMethod:SendMessageByPost1
* MethodParam:{"p1","p2"}
* ParamVal:{"v1","v2"}
*/
public static String GetWcfServiceUtility(String ServerAddress,
String SvcFileName, String ServerMethod, String[] MethodParam,
String[] ParamVal)
{
String UrlParam = null;
if ((MethodParam.length > 1))
{
for (int i = 0; i < MethodParam.length; i++)
{
if (i == 0)
{
UrlParam = "?" + MethodParam[i] + "=" + ParamVal[i];
}
else
{
UrlParam = UrlParam + "&" + MethodParam[i] + "="
+ ParamVal[i];
}
}
}
else if (MethodParam.length == 1)
{
UrlParam = "?" + MethodParam[0] + "=" + ParamVal[0];
}
UrlString = UrlString + ServerAddress + UTag + SvcFileName + USvcSuffix + UTag + ServerMethod
+ UrlParam;
String Rslt = null;
try
{
HttpClient client = new DefaultHttpClient();
HttpGet request = new HttpGet(UrlString);
HttpResponse response = client.execute(request);
Rslt = EntityUtils.toString(response.getEntity());
}
catch (Exception e)
{
Rslt = null;
}
UrlString = "http://";
return Rslt;
}

/*
* http://192.168.1.198/ACWcfService/AccountService.svc/SendMessageByPost1
* @param:
* ServerAddress:192.168.1.198/ACWcfService
* SvcFileName:AccountService
* ServerMethod:SendMessageByPost1
* MethodParam:{"p1","p2"}
* ParamVal:{"v1","v2"}
*/
public static String PostWcfServiceUtility(String ServerAddress,
String SvcFileName, String ServerMethod, String[] MethodParam,
String[] ParamVal)
{
String Rslt = null;
try
{
// 创建 HttpParams 以用来设置 HTTP 参数(这一部分不是必需的)
HttpParams params = new BasicHttpParams();
// 设置连接超时和 Socket 超时,以及 Socket 缓存大小
HttpConnectionParams.setConnectionTimeout(params, 20 * 1000);
HttpConnectionParams.setSoTimeout(params, 20 * 1000);
HttpConnectionParams.setSocketBufferSize(params, 8192);
// 设置重定向,缺省为true
HttpClientParams.setRedirecting(params, true);

HttpClient client = new DefaultHttpClient(params);
UrlString = UrlString + ServerAddress + UTag + SvcFileName + USvcSuffix + UTag
+ ServerMethod;
HttpPost request = new HttpPost(UrlString);
JSONObject p = new JSONObject();
for (int i = 0; i < MethodParam.length; i++)
{
p.put(MethodParam[i], ParamVal[i]);
}
request.setEntity(new StringEntity(p.toString()));
request.setHeader(HTTP.CONTENT_TYPE, "application/json");
HttpResponse response = client.execute(request);
Rslt = EntityUtils.toString(response.getEntity());
}
catch (Exception e)
{
Rslt = null;
}
UrlString = "http://";
return Rslt;
}

public static String HttpURLPost(String ServerAddress,
String SvcFileName, String ServerMethod, String[] MethodParam,
String[] ParamVal)
{
String Rslt = StringHelper.Empty();
HttpURLConnection urlCnn = null;
InputStream inputStream = null;
try {
UrlString = UrlString + ServerAddress + UTag + SvcFileName + USvcSuffix + UTag
+ ServerMethod;
URL url = new URL(UrlString);
urlCnn = (HttpURLConnection) url.openConnection();
urlCnn.setDoOutput(true);
urlCnn.setDoInput(true);
urlCnn.setRequestMethod("POST");
urlCnn.setUseCaches(false);
urlCnn.setConnectTimeout(10000);
urlCnn.setReadTimeout(8000);
urlCnn.setRequestProperty("Content-Type", "text/json");
urlCnn.setRequestProperty("Accept-Charset", "utf-8");
urlCnn.setRequestProperty("contentType", "utf-8");
OutputStream os = urlCnn.getOutputStream();

String param = "one=valueGoesHere";

os.write(param.getBytes());
inputStream = urlCnn.getInputStream();
byte[] buffer = null;
if(urlCnn.getResponseCode() == 200){
buffer = new byte[1024];
ByteArrayOutputStream out = new ByteArrayOutputStream();
int len;
while ((len = inputStream.read(buffer)) != -1)
{
out.write(buffer, 0, len);
}
buffer = out.toByteArray();
}
} catch (Exception e) {
e.printStackTrace();
Log.e("sjr","Network-error");
}
finally{
try {
if(inputStream != null){
inputStream.close();
}
if(urlCnn != null){
urlCnn.disconnect();
}
} catch (IOException e) {
e.printStackTrace();
Log.e("sjr","InvokeWebServiceHelper类中释放资源出错");
}
}
return Rslt;
}
}
...全文
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Donyle 2014年01月08日
也遇到了同样的问题,解决方法在研究中...
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Alfredknox 2013年07月24日
package UtilityBundle;

import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStreamReader;
import java.io.UnsupportedEncodingException;
import java.net.URLEncoder;
import java.util.ArrayList;
import java.util.List;
import java.util.Map;
import org.apache.http.HttpResponse;
import org.apache.http.HttpStatus;
import org.apache.http.NameValuePair;
import org.apache.http.client.ClientProtocolException;
import org.apache.http.client.HttpClient;
import org.apache.http.client.entity.UrlEncodedFormEntity;
import org.apache.http.client.methods.HttpGet;
import org.apache.http.client.methods.HttpPost;
import org.apache.http.client.methods.HttpUriRequest;
import org.apache.http.impl.client.DefaultHttpClient;
import org.apache.http.message.BasicNameValuePair;
import android.os.Handler;
import android.util.Log;
public class HttpConnectionUtil {
	public static enum HttpMethod {GET, POST}
	
	public void asyncConnect(final String url, final HttpMethod method, final HttpConnectionCallback callback) {
		asyncConnect(url, null, method, callback);
	}
	
	public void syncConnect(final String url, final HttpMethod method, final HttpConnectionCallback callback) {
		syncConnect(url, null, method, callback);
	}
	
	public void asyncConnect(final String url, final Map<String, String> params, 
			final HttpMethod method, final HttpConnectionCallback callback) {
		Handler handler = new Handler();
		Runnable runnable = new Runnable() {
			public void run() {
				syncConnect(url, params, method, callback);
			}
		};
		handler.post(runnable);
	}
	
	public void syncConnect(final String url, final Map<String, String> params, 
			final HttpMethod method, final HttpConnectionCallback callback) {
		String json = null;
		BufferedReader reader = null;
		
		try {
			HttpClient client = new DefaultHttpClient();
			HttpUriRequest request = getRequest(url, params, method);
			HttpResponse response = client.execute(request);
			if (response.getStatusLine().getStatusCode() == HttpStatus.SC_OK) {
				reader = new BufferedReader(new InputStreamReader(response.getEntity().getContent()));
				StringBuilder sb = new StringBuilder();
				for (String s = reader.readLine(); s != null; s = reader.readLine()) {
					sb.append(s);
				}
				json = sb.toString();
			}
		} catch (ClientProtocolException e) {
			Log.e("HttpConnectionUtil", e.getMessage(), e);
		} catch (IOException e) {
			Log.e("HttpConnectionUtil", e.getMessage(), e);
		} finally {
			try {
				if (reader != null) {
					reader.close();
				}
			} catch (IOException e) {
				// ignore me
			}
		}
		callback.execute(json);
	}
	
	private HttpUriRequest getRequest(String url, Map<String, String> params, HttpMethod method) {
		if (method.equals(HttpMethod.POST)) {
			List<NameValuePair> listParams = new ArrayList<NameValuePair>();
			if (params != null) {
				for (String name : params.keySet()) {
					listParams.add(new BasicNameValuePair(name, params.get(name)));
				}
			}
			try {
				UrlEncodedFormEntity entity = new UrlEncodedFormEntity(listParams);
				HttpPost request = new HttpPost(url);
				request.setEntity(entity);
				return request;
			} catch (UnsupportedEncodingException e) {
				// Should not come here, ignore me.
				throw new java.lang.RuntimeException(e.getMessage(), e);
			}
		} else {
			if (url.indexOf("?") < 0) {
				url += "?";
			}
			if (params != null) {
				for (String name : params.keySet()) {
					url += "&" + name + "=" + URLEncoder.encode(params.get(name));
				}
			}
			HttpGet request = new HttpGet(url);
			return request;
		}
	}
}
package UtilityBundle;

public interface HttpConnectionCallback {
	void execute(String response);
}
不知道怎么实现这个接口,我直接用Login extends Activity implements HttpConnectionCallback 实现后,但执行不了void execute(String response){这里如果操作response就会出错}
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Alfredknox 2013年07月24日
难道所有主线程界面操作都由子线程去完成吗?有没有好的AsyncTask和Handle例子?
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louyong0571 2013年07月23日
还是把网络访问的部分放到主线程以外去做吧。
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mr_same 2013年07月23日
错误信息贴出来 还有就是贴下面代码试试 在访问网络前 把判断4.0降为3.0就行 以前判断的为4.0就进入
		// 如果本系统为4.0以上(Build.VERSION_CODES.ICE_CREAM_SANDWICH为android4.0)
		if (Build.VERSION.SDK_INT > Build.VERSION_CODES.ICE_CREAM_SANDWICH) {
			// 详见StrictMode文档
			StrictMode.setThreadPolicy(new StrictMode.ThreadPolicy.Builder()
					.detectDiskReads().detectDiskWrites().detectNetwork()
					.penaltyLog().build());
			StrictMode.setVmPolicy(new StrictMode.VmPolicy.Builder()
					.detectLeakedSqlLiteObjects().detectLeakedClosableObjects()
					.penaltyLog().penaltyDeath().build());
		}
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Alfredknox 2013年07月23日
确实是在主进程去获取服务器数据,如果用子线程去获取数据,应该如何处理?AsyncTask或Handle这两种方式哪种比较好?用AsyncTask去处理如何把数据反回到主线程?
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LichKingSZ 2013年07月22日
应该就是楼主所说的,在主线程访问网络的原因,在3.0之前是允许的,3.0开始就会报错
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荒颜 2013年07月22日
赞同1楼的观点 报错稳稳的在主线程执行网络请求了
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五柳--先生 2013年07月22日
把错误信息贴上来再看这个额 贴这么一大块东西上来,眼睛都看花了,好歹注一下是哪里出错的 关于http,如果版本上出现问题看一下你是不是在主线程中请求数据的,如果是,放到子线程,android4.0以后的版本不允许在主线程访问网络(3.0以上的是平板的,我不是很清楚) 查一查是不是这个原因吧, 如果不是,把详细的错误信息贴上来
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