Android Open Source - NavigationDrawer Log View

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License

The source code is released under:

Apache License

Java Source Code

/*
 * Copyright (C) 2013 The Android Open Source Project
 *//from   ww w .  j  a  va 2 s.  co  m
 * 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.AttributeSet;
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);
  }


}

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