| /* |
| * Copyright (C) 2017 The Android Open Source Project |
| * |
| * Licensed under the Apache License, Version 2.0 (the "License"); |
| * you may not use this file except in compliance with the License. |
| * You may obtain a copy of the License at |
| * |
| * http://www.apache.org/licenses/LICENSE-2.0 |
| * |
| * Unless required by applicable law or agreed to in writing, software |
| * distributed under the License is distributed on an "AS IS" BASIS, |
| * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
| * See the License for the specific language governing permissions and |
| * limitations under the License. |
| */ |
| package com.example.android.common.logger |
| |
| import android.app.Activity |
| import android.content.Context |
| import android.util.* |
| import android.widget.TextView |
| |
| /** Simple TextView which is used to output log data received through the LogNode interface. |
| */ |
| class LogView : TextView, LogNode { |
| |
| // The next LogNode in the chain. |
| private var next: LogNode? = null |
| |
| @JvmOverloads |
| constructor(context: Context, attrs: AttributeSet? = null, defStyle: Int = 0) : |
| super(context, attrs, defStyle) |
| |
| /** |
| * Formats the log data and prints it out to the LogView. |
| * @param priority Log level of the data being logged. Verbose, Error, etc. |
| * @param tag Tag for for the log data. Can be used to organize log statements. |
| * @param msg The actual message to be logged. The actual message to be logged. |
| * @param tr If an exception was thrown, this can be sent along for the logging facilities |
| * to extract and print useful information. |
| */ |
| override fun println(priority: Int, tag: String?, msg: String?, tr: Throwable?) { |
| |
| // For the purposes of this View, we want to print the priority as readable text. |
| val priorityStr = when (priority) { |
| android.util.Log.VERBOSE -> "VERBOSE" |
| android.util.Log.DEBUG -> "DEBUG" |
| android.util.Log.INFO -> "INFO" |
| android.util.Log.WARN -> "WARN" |
| android.util.Log.ERROR -> "ERROR" |
| android.util.Log.ASSERT -> "ASSERT" |
| else -> null |
| } |
| |
| // Handily, the Log class has a facility for converting a stack trace into a usable string. |
| val exceptionStr = tr?.let{ android.util.Log.getStackTraceString(it) } |
| |
| // Take the priority, tag, message, and exception, and concatenate as necessary |
| // into one usable line of text. |
| val outputBuilder = StringBuilder() |
| |
| val delimiter = "\t" |
| appendIfNotNull(outputBuilder, priorityStr, delimiter) |
| appendIfNotNull(outputBuilder, tag, delimiter) |
| appendIfNotNull(outputBuilder, msg, delimiter) |
| appendIfNotNull(outputBuilder, exceptionStr, delimiter) |
| |
| // In case this was originally called from an AsyncTask or some other off-UI thread, |
| // make sure the update occurs within the UI thread. |
| (context as Activity).runOnUiThread( { |
| // Display the text we just generated within the LogView. |
| appendToLog(outputBuilder.toString()) |
| }) |
| |
| |
| next?.println(priority, tag, msg, tr) |
| |
| } |
| |
| /** Takes a string and adds to it, with a separator, if the bit to be added isn't null. Since |
| * the logger takes so many arguments that might be null, this method helps cut out some of the |
| * agonizing tedium of writing the same 3 lines over and over. |
| * @param source StringBuilder containing the text to append to. |
| * @param addStr The String to append |
| * @param delimiter The String to separate the source and appended strings. A tab or comma, |
| * for instance. |
| * @return The fully concatenated String as a StringBuilder |
| */ |
| private fun appendIfNotNull(source: StringBuilder, addStr: String?, delimiter: String): StringBuilder { |
| |
| if (addStr != null && !addStr.isEmpty()) { |
| return source.append(addStr).append(delimiter) |
| } |
| |
| return source |
| |
| } |
| |
| /** Outputs the string as a new line of log data in the LogView. */ |
| private fun appendToLog(s: String) { |
| append("\n" + s) |
| } |
| |
| |
| } |