Android Open Source - AGOGCyberStat Text View Appender

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Back to project page AGOGCyberStat.

License

The source code is released under:

MIT License

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Java Source Code

package me.allenz.androidapplog;
//from  www  . ja  v a  2 s  .  c om
import java.lang.ref.WeakReference;
import java.util.concurrent.TimeUnit;

import android.content.Context;
import android.os.Handler;
import android.widget.TextView;

public class TextViewAppender extends AsyncAppender {

  private static final int MAX_LOG_TEXT_LENGHT_IN_VIEW = 50000;

  private static final long MIN_PRINT_PERIOD = 500;

  private WeakReference<TextView> textViewRef;

  private Handler mainHandler;

  private static final StringBuilder logCache = new StringBuilder();

  private long lastUpdateMillis;

  static int sUpdateCount;
  private int mUpdateCount;

  public TextViewAppender(){
    super();
  }

  public void bind(final TextView textView) {
    if (textView == null) {
      return;
    }
    textViewRef = new WeakReference<TextView>(textView);
  }

  public void unbind() {
    textViewRef = null;
    lastUpdateMillis = 0;
    logEventQueue.clear();
  }

  private void postLogToUIThread(final String log) {
    if (mainHandler == null) {
      final Context context = LoggerFactory.getContext();
      if (context == null) {
        return;
      } else {
        mainHandler = new Handler(context.getMainLooper());
      }
    }
    mainHandler.post(new Runnable(){

      @Override
      public void run() {
        if (textViewRef != null) {
          final TextView textView = textViewRef.get();
          if (textView != null) {
            textView.setText(log);
          }
        }
      }

    });
  }

  /* Keep a ring buffer of old events for a newly displayed textview */
  public static void cacheEvent(LogEvent event)
  {
    logCache.append(event.toString());    
    while (logCache.length() > MAX_LOG_TEXT_LENGHT_IN_VIEW) {
      final int index = logCache.indexOf("\n");
      logCache.delete(0, index + 1);
    }
    sUpdateCount++;
  }

  @Override
  protected void handleEventQueue() throws InterruptedException {
    @SuppressWarnings("unused")
    final LogEvent event = logEventQueue.poll(MIN_PRINT_PERIOD, TimeUnit.MILLISECONDS);
   if (sUpdateCount != mUpdateCount && textViewRef != null) {
      final TextView textView = textViewRef.get();
      mUpdateCount = sUpdateCount;
      if (textView != null) {
        final long currentMillis = System.currentTimeMillis();
        if ((currentMillis -
            lastUpdateMillis > MIN_PRINT_PERIOD ||
            lastUpdateMillis == 0) &&
            logCache.length() > 0) {
          postLogToUIThread(logCache.toString());
          lastUpdateMillis = currentMillis;
        }
      }
    }

  }

}

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