| /* |
| * Copyright (C) 2012 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.os.Bundle; |
| import android.support.v4.app.Fragment; |
| import android.util.Log; |
| import android.view.LayoutInflater; |
| import android.view.View; |
| import android.view.ViewGroup; |
| import android.widget.ScrollView; |
| import android.widget.TextView; |
| |
| /** |
| * Simple fragment which contains a TextView and uses is to output log data it receives |
| * through the LogNode interface. |
| */ |
| public class LogFragment extends Fragment implements LogNode { |
| |
| // The next LogNode in the chain. |
| LogNode mNext; |
| |
| public LogFragment() {} |
| |
| @Override |
| public View onCreateView(LayoutInflater inflater, ViewGroup container, |
| Bundle savedInstanceState) { |
| return inflater.inflate(R.layout.log_fragment, container, false); |
| } |
| |
| public TextView getTextView() { |
| return (TextView) getActivity().findViewById(R.id.log_output); |
| } |
| |
| /** Outputs the string as a new line of log data in the TextView. */ |
| public void appendToLog(String s) { |
| getTextView().append("\n" + s); |
| ((ScrollView) getActivity().findViewById(R.id.log_scroll)).fullScroll(View.FOCUS_DOWN); |
| } |
| |
| public LogNode getNext() { |
| return mNext; |
| } |
| |
| public void setNext(LogNode node) { |
| mNext = node; |
| } |
| |
| /** Takes a string and adds to it, with a seperator, 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 sourceStr The String to append to. |
| * @param appendStr The String to append |
| * @param delimiter The String to seperate the source and appendee strings. A tab or comma, |
| * for instance. |
| * @return The fully concatonated String |
| */ |
| private String appendIfNotNull(String sourceStr, String appendStr, String delimiter) { |
| if (appendStr != null) { |
| if (appendStr.length() == 0) { |
| delimiter = ""; |
| } |
| sourceStr = TextUtils.concat(sourceStr, delimiter, appendStr); |
| } |
| return sourceStr; |
| } |
| |
| /** |
| * Formats the log data and prints it out to the TextView. |
| * @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 Fragment, we want to print the priority as readable text. |
| switch(priority) { |
| case Log.VERBOSE: |
| priorityStr = "V"; |
| break; |
| case Log.DEBUG: |
| priorityStr = "D"; |
| break; |
| case Log.INFO: |
| priorityStr = "I"; |
| break; |
| case Log.WARN: |
| priorityStr = "W"; |
| break; |
| case Log.ERROR: |
| priorityStr = "E"; |
| break; |
| case Log.ASSERT: |
| priorityStr = "A"; |
| break; |
| default: |
| break; |
| } |
| |
| // Handily, the Log class has a facility for converting a stack trace into a useable string. |
| String exceptionStr = null; |
| if (tr != null) { |
| exceptionStr = Log.getStackTraceString(tr); |
| } |
| |
| // Take the priority, tag, message, and exception, and concatonate as necessary |
| // into one usable line of text. |
| String outputStr = ""; |
| outputStr = appendIfNotNull(outputStr, priorityStr, "\t"); |
| outputStr = appendIfNotNull(outputStr, tag, "\t"); |
| outputStr = appendIfNotNull(outputStr, msg, "\t"); |
| outputStr = appendIfNotNull(outputStr, exceptionStr, "\t"); |
| |
| // Actually display the text we just generated within the TextView. |
| appendToLog(outputStr); |
| |
| if (mNext != null) { |
| mNext.println(priority, tag, msg, tr); |
| } |
| } |
| } |