| /* |
| * Copyright (C) 2013 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. |
| */ |
| public class LogView extends TextView implements LogNode { |
| |
| public LogView(Context context) { |
| super(context); |
| } |
| |
| public LogView(Context context, AttributeSet attrs) { |
| super(context, attrs); |
| } |
| |
| public LogView(Context context, AttributeSet attrs, int defStyle) { |
| 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 |
| public void println(int priority, String tag, String msg, Throwable tr) { |
| |
| |
| String priorityStr = null; |
| |
| // For the purposes of this View, we want to print the priority as readable text. |
| switch(priority) { |
| case android.util.Log.VERBOSE: |
| priorityStr = "VERBOSE"; |
| break; |
| case android.util.Log.DEBUG: |
| priorityStr = "DEBUG"; |
| break; |
| case android.util.Log.INFO: |
| priorityStr = "INFO"; |
| break; |
| case android.util.Log.WARN: |
| priorityStr = "WARN"; |
| break; |
| case android.util.Log.ERROR: |
| priorityStr = "ERROR"; |
| break; |
| case android.util.Log.ASSERT: |
| priorityStr = "ASSERT"; |
| break; |
| default: |
| break; |
| } |
| |
| // Handily, the Log class has a facility for converting a stack trace into a usable string. |
| String exceptionStr = null; |
| if (tr != null) { |
| exceptionStr = android.util.Log.getStackTraceString(tr); |
| } |
| |
| // Take the priority, tag, message, and exception, and concatenate as necessary |
| // into one usable line of text. |
| final StringBuilder outputBuilder = new StringBuilder(); |
| |
| String 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. |
| ((Activity) getContext()).runOnUiThread( (new Thread(new Runnable() { |
| @Override |
| public void run() { |
| // Display the text we just generated within the LogView. |
| appendToLog(outputBuilder.toString()); |
| } |
| }))); |
| |
| if (mNext != null) { |
| mNext.println(priority, tag, msg, tr); |
| } |
| } |
| |
| public LogNode getNext() { |
| return mNext; |
| } |
| |
| public void setNext(LogNode node) { |
| mNext = node; |
| } |
| |
| /** 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 StringBuilder appendIfNotNull(StringBuilder source, String addStr, String delimiter) { |
| if (addStr != null) { |
| if (addStr.length() == 0) { |
| delimiter = ""; |
| } |
| |
| return source.append(addStr).append(delimiter); |
| } |
| return source; |
| } |
| |
| // The next LogNode in the chain. |
| LogNode mNext; |
| |
| /** Outputs the string as a new line of log data in the LogView. */ |
| public void appendToLog(String s) { |
| append("\n" + s); |
| } |
| |
| |
| } |