由于 AndroidAsyncHttp 1.4.4 的 JsonHttpResponseHandler 存在死循环的 BUG，1.4.5 版本发布不知道要何时，所以只能临时替换该类来修复这个错误。
Android开源库loopj的android-async-http的 JsonHttpResponseHandler 存在死循环GC_CONCURRENT
package com.ai9475.extend;
import com.ai9475.meitian.AppManager;
import com.ai9475.meitian.R;
import com.loopj.android.http.JsonHttpResponseHandler;
import android.app.AlertDialog;
import android.content.DialogInterface;
import android.util.Log;
import org.apache.http.Header;
import org.apache.http.HttpStatus;
import org.json.JSONArray;
import org.json.JSONException;
import org.json.JSONObject;
import org.json.JSONTokener;
import java.io.UnsupportedEncodingException;
/**
* 复写 AndroidAsyncHttp 1.4.4 开源库的 JsonHttpResponseHandler 类
* 当 1.4.5 released 后失效
*
* Created by ZHOUZ on 2014/3/22.
*/
public class ZJsonHttpResponseHandler extends JsonHttpResponseHandler
{
private static final String LOG_TAG = "JsonHttpResponseHandler";
/**
* Returns when request succeeds
*
* @param statusCode http response status line
* @param headers response headers if any
* @param response parsed response if any
*/
public void onSuccess(int statusCode, Header[] headers, JSONObject response) {
}
/**
* Returns when request succeeds
*
* @param statusCode http response status line
* @param headers response headers if any
* @param response parsed response if any
*/
public void onSuccess(int statusCode, Header[] headers, JSONArray response) {
}
/**
* Returns when request failed
*
* @param statusCode http response status line
* @param headers response headers if any
* @param throwable throwable describing the way request failed
* @param errorResponse parsed response if any
*/
public void onFailure(int statusCode, Header[] headers, Throwable throwable, JSONObject errorResponse) {
}
/**
* Returns when request failed
*
* @param statusCode http response status line
* @param headers response headers if any
* @param throwable throwable describing the way request failed
* @param errorResponse parsed response if any
*/
public void onFailure(int statusCode, Header[] headers, Throwable throwable, JSONArray errorResponse) {
}
@Override
public void onFailure(int statusCode, Header[] headers, String responseString, Throwable throwable) {
final AlertDialog.Builder dialog = new AlertDialog.Builder(AppManager.ActivityManager.current());
dialog.setIcon(android.R.drawable.ic_dialog_info);
dialog.setTitle(R.string.app_error);
dialog.setMessage(responseString);
dialog.setNegativeButton(R.string.sure,
new DialogInterface.OnClickListener() {
@Override
public void onClick(DialogInterface dialog, int which) {
dialog.dismiss();
}
});
dialog.show();
}
@Override
public void onSuccess(int statusCode, Header[] headers, String responseString) {
}
@Override
public final void onSuccess(final int statusCode, final Header[] headers, final byte[] responseBytes) {
if (statusCode != HttpStatus.SC_NO_CONTENT) {
new Thread(new Runnable() {
@Override
public void run() {
try {
final Object jsonResponse = parseResponse(responseBytes);
postRunnable(new Runnable() {
@Override
public void run() {
if (jsonResponse instanceof JSONObject) {
onSuccess(statusCode, headers, (JSONObject) jsonResponse);
} else if (jsonResponse instanceof JSONArray) {
onSuccess(statusCode, headers, (JSONArray) jsonResponse);
} else if (jsonResponse instanceof String) {
onFailure(statusCode, headers, (String) jsonResponse, new JSONException("Response cannot be parsed as JSON data"));
} else {
onFailure(statusCode, headers, new JSONException("Unexpected response type " + jsonResponse.getClass().getName()), (JSONObject) null);
}
}
});
} catch (final JSONException ex) {
postRunnable(new Runnable() {
@Override
public void run() {
onFailure(statusCode, headers, ex, (JSONObject) null);
}
});
}
}
}).start();
} else {
onSuccess(statusCode, headers, new JSONObject());
}
}
@Override
public final void onFailure(final int statusCode, final Header[] headers, final byte[] responseBytes, final Throwable throwable) {
if (responseBytes != null) {
new Thread(new Runnable() {
@Override
public void run() {
try {
final Object jsonResponse = parseResponse(responseBytes);
postRunnable(new Runnable() {
@Override
public void run() {
if (jsonResponse instanceof JSONObject) {
onFailure(statusCode, headers, throwable, (JSONObject) jsonResponse);
} else if (jsonResponse instanceof JSONArray) {
onFailure(statusCode, headers, throwable, (JSONArray) jsonResponse);
} else if (jsonResponse instanceof String) {
onFailure(statusCode, headers, (String) jsonResponse, throwable);
} else {
onFailure(statusCode, headers, new JSONException("Unexpected response type " + jsonResponse.getClass().getName()), (JSONObject) null);
}
}
});
} catch (final JSONException ex) {
postRunnable(new Runnable() {
@Override
public void run() {
onFailure(statusCode, headers, ex, (JSONObject) null);
}
});
}
}
}).start();
} else {
Log.v(LOG_TAG, "response body is null, calling onFailure(Throwable, JSONObject)");
onFailure(statusCode, headers, throwable, (JSONObject) null);
}
}
/**
* Returns Object of type {@link JSONObject}, {@link JSONArray}, String, Boolean, Integer, Long,
* Double or {@link JSONObject#NULL}, see {@link org.json.JSONTokener#nextValue()}
*
* @param responseBody response bytes to be assembled in String and parsed as JSON
* @return Object parsedResponse
* @throws org.json.JSONException exception if thrown while parsing JSON
*/
protected Object parseResponse(byte[] responseBody) throws JSONException {
if (null == responseBody)
return null;
Object result = null;
//trim the string to prevent start with blank, and test if the string is valid JSON, because the parser don't do this :(. If Json is not valid this will return null
String jsonString = getResponseString(responseBody, getCharset());
if (jsonString != null) {
jsonString = jsonString.trim();
if (jsonString.startsWith("{") || jsonString.startsWith("[")) {
result = new JSONTokener(jsonString).nextValue();
}
}
if (result == null) {
result = jsonString;
}
return result;
}
/**
* Attempts to encode response bytes as string of set encoding
*
* @param charset charset to create string with
* @param stringBytes response bytes
* @return String of set encoding or null
*/
public static String getResponseString(byte[] stringBytes, String charset) {
try {
return stringBytes == null ? null : new String(stringBytes, charset);
} catch (UnsupportedEncodingException e) {
Log.e(LOG_TAG, "Encoding response into string failed", e);
return null;
}
}
}
现在如果再出现 HTTP 500 或其他服务端错误（输出非 JSON 字符串）时将会直接弹出服务端页面内容的对话框方便调试了，现在只能这样了，等新版本发布后再转换下吧！
