一款软件就像一个孩子，不断的在学习，在探索，当孩子犯下错误的时候，我们可以去包容，当孩子犯不改的时候，获取他就不再让人喜欢，甚至是去抛弃他。人之常情的问题，也是做软件的我们需要去考虑的问题。同样孩子的成长速度和懂事程度也是我们非常关注的。
本章讲述Android日志上传功能，更快的更准确的将孩子的错误通知给我们，我们帮助孩子改正它的错误。
1.日志统计和日志存储
public static void record(Context context, String ex) {
if (context == null) {
return;
}
PrintStream printStream = null;
ByteArrayOutputStream bos = null;
try {
bos = new ByteArrayOutputStream(256);
printStream = new PrintStream(bos);
printStream.print(ex);
JSONObject createJson = createJson(context, new String(bos.toByteArray()));//(1)做json
DBManager.getInstance(context).addCrashLog(createJson.toString());//(2)存储数据信息
Prefs.setPrefBoolean(PrefsContants.IS_NEEDED_UPLOAD, true));
} catch (Exception e) {
Log.e("CrashUploadUtils", "writeLog", e);
} finally {
closeQuietly(printStream);//(3)
closeQuietly(bos);
}
}由上面代码可以看出我们将数据字符串传入统计记录后，首先做成json数据，如步骤（1）；其次将数据存入数据库，如步骤（2）；最后关闭我们的数据流，如步骤三。
（1）做成json数据
private static JSONObject createJson(Context context, String log) {
JSONObject object = null;
try {
object = new JSONObject();
object.put("type", "crash");
JSONObject data = new JSONObject();
data.put("log", log);
data.put("uk", AccountManager.getUK(context));
data.put("version", IMManager.getVersion());
data.put("trigger_id", Utility.getTriggerId(context));
if (!TextUtils.isEmpty(android.os.Build.VERSION.RELEASE)) {
data.put("os", android.os.Build.VERSION.RELEASE);
}
if (!TextUtils.isEmpty(android.os.Build.MODEL)) {
data.put("device_model","mode" + android.os.Build.MODEL);
}
if (!TextUtils.isEmpty(android.os.Build.MANUFACTURER)) {
data.put("manufacture",android.os.Build.MANUFACTURER);
}
object.put("data", data);
object.put("ts", System.currentTimeMillis());
} catch (JSONException e) {
Log.e("CrashUploadUtils", "createJson", e);
}
return object;
}内容这里可以忽略，自己放入就好。
（2）添加数据库
public void addCrashLog(String log) {
synchronized (mSyncLock) {
ContentValues values = new ContentValues();
values.put(CrashLogColumns.COLUMN_COTENT, log);
insert(TableDefine.DB_TABLE_CRASH_LOG, values);
}
}其中insert函数，读者要自己写了。
（3）关闭数据流
private static void closeQuietly(OutputStream os) {
if (os != null) {
try {
os.close();
} catch (IOException e) {
Log.e("CrashUploadUtils", "closeQuietly", e);
}
}
}上面我们完成了，日志的统计和信息的存储，其中日志的存储看上面添加数据库的过程。
2.日志上传
日志上传是该功能的关键步骤，涉及的问题有：怎么上传，什么时候上传，什么网络环境下上传？
日志上传功能
private static void upLoad(Context context) {
Pair<Long, JSONArray> log = getCrashLog(context);//1获取数据库中异常信息
if (log == null || log.first < 0) {
return;
}
StringBuilder builder = new StringBuilder();
builder.append("device_id=" + Utility.getDeviceType(context));
builder.append("&appid=" + AccountManager.getAppid(context));
builder.append("&statistic=" + log.second.toString());
String jsonResult = null;
try {//2上传异常信息
jsonResult = HttpUtility.doUploadPost(url, builder.toString().getBytes("utf-8"));
} catch (UnsupportedEncodingException e) {
Log.e("CrashUploadUtils", "upLoadCrash UnsupportedEncodingException", e);
}
if (jsonResult == null) {
Log.e("CrashUploadUtils", "upload crash log failed!!");
return;
}
try {
JSONObject jsonObject = new JSONObject(jsonResult);
int errorCode = jsonObject.optInt("err_code");
String msg = jsonObject.optString("msg");//根据网络结果删除已经上传过的信息，并更新上传记录时间
if (errorCode == OK) {//3删除上传过的信息
int result = DBManager.getInstance(context).deleteLogBeforeId(log.first);
if (result > 0) {//4更新上传时间
updateUploadTime(context, System.currentTimeMillis());
}
}
} catch (JSONException e) {
Log.e("CrashUploadUtils", "upLoadCrash JSONException", e);
}
}（1）获取数据库中异常信息
public static Pair<Long, JSONArray> getCrashLog(Context context) {
return DBManager.getInstance(context).getLog();
}
public Pair<Long, JSONArray> getLog() {
synchronized (mSyncLock) {
CrashLogParse parse = new CrashLogParse();
query(TableDefine.DB_TABLE_CRASH_LOG, null, null, null, null, null, CrashLogColumns._ID + " asc ", " 10 ",
parse);
return parse.getResult();
}
}
class CrashLogParse implements CursorParse {
Pair<Long, JSONArray> result = null;
@Override
public void parseCursor(Cursor cursor) {
if (cursor != null) {
long maxid = -1;
long id = -1;
String log = null;
JSONArray array = null;
try {
array = new JSONArray();
while (cursor.moveToNext()) {
id = cursor.getLong(cursor.getColumnIndex(CrashLogColumns._ID));
log = cursor.getString(cursor.getColumnIndex(CrashLogColumns.COLUMN_COTENT));
if (id > maxid) {
maxid = id;
}
array.put(new JSONObject(log));
}
} catch (JSONException e) {
array = null;
e.printStackTrace();
}
if (array != null) {
result = new Pair<Long, JSONArray>(maxid, array);
}
}
}
@Override
public Pair<Long, JSONArray> getResult() {
return result;
}
}获取到相应的数据库信息，获取的是其中的所有记录和最大id值。
（2）上传异常信息
public static String doUploadPost(String httpUrl, byte[] byteToUpload) {
if (byteToUpload == null || byteToUpload.length < 0) {
return null;
}
URL url;
HttpURLConnection httpUrlConnection = null;
try {
url = new URL(httpUrl);
httpUrlConnection = (HttpURLConnection) url.openConnection();
httpUrlConnection.setRequestMethod("POST");
httpUrlConnection.setDoInput(true);
// Post mode
httpUrlConnection.setDoOutput(true);
httpUrlConnection.setConnectTimeout(30 * 1000);
httpUrlConnection.setReadTimeout(30 * 1000);
httpUrlConnection.setUseCaches(false);
OutputStream outputStream = httpUrlConnection.getOutputStream();
outputStream.write(byteToUpload);
outputStream.flush();
outputStream.close();
// while (offset < byteLength) {
// bufferOutStream.write(byteToUpload);
// offset += length;
// }
int response = httpUrlConnection.getResponseCode();
if (Constants.isDebugMode()) {
Log.e("HttpUtility", "upload response:" + response);
}
if (response != HttpURLConnection.HTTP_OK) {
return null;
}
return dealResponseResult(httpUrlConnection.getInputStream());
} catch (MalformedURLException e) {
Log.e("HttpUtility", "MalformedURLException doUploadPost", e);
} catch (IOException e) {
Log.e("HttpUtility", "IOException doUploadPost", e);
} catch (Exception e) {
Log.e("HttpUtility", "Exception doUploadPost", e);
} finally {
if (httpUrlConnection != null) {
httpUrlConnection.disconnect();
}
}
return null;
}
/**
* @param inputStream
* @return
*/
public static String dealResponseResult(InputStream inputStream) {
String resultData = null; // 存储处理结果
ByteArrayOutputStream byteArrayOutputStream = new ByteArrayOutputStream();
byte[] data = new byte[1024];
int len = 0;
int offset = 0;
try {
while ((len = inputStream.read(data)) != -1) {
byteArrayOutputStream.write(data, offset, len);
offset += len;
}
resultData = new String(byteArrayOutputStream.toByteArray());
if (Constants.isDebugMode()) {
Log.d("HttpUtility", "resultData:" + resultData);
}
} catch (IOException e) {
Log.e("HttpUtility", "IOException dealResponseResult", e);
}
return resultData;
}（3）删除上传过的信息
public int deleteLogBeforeId(long id) {
synchronized (mSyncLock) {
return delete(TableDefine.DB_TABLE_CRASH_LOG, CrashLogColumns._ID + " <=?",
new String[] { String.valueOf(id) });
}
}（4）更新上传时间
其中定义了上传时间间隔，不能上传过于频繁，造成服务压力，基本几个在10分钟左右，这里时间自己可以设定
private static boolean updateUploadTime(Context context, long time) {
if (time > lastUpdateTime) {
lastUpdateTime = time;
return Utility.writeLongData(context, key, lastUpdateTime);
}
return false;
}
private static long getUpdateTime(Context context) {
if (lastUpdateTime == -1) {
lastUpdateTime = Utility.readLongData(context, key, -1);
}
return lastUpdateTime;
}
public static boolean isNeedToUpload(Context context, long time) {
return System.currentTimeMillis() - getUpdateTime(context) > time;
}（5）开始上传
public static void statUpload(final Context context) {
if(!Prefs.getPrefBoolean(PrefsContants.IS_NEEDED_UPLOAD, false))){
return;
}
if(!isNeedToUpload){
return;
}
new Thread(new Runnable() {
@Override
public void run() {
upLoadCrash(context);
}
}).start();
}以后就可以通过在服务端查看日志去快速修改app所犯下的错误。
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