工具类：用于监听Activity的创建和内存级回收情况,防止Activity Leaking
import java.io.BufferedOutputStream;import java.io.Closeable;import java.io.FileOutputStream;import java.io.IOException;import java.lang.ref.PhantomReference;import java.lang.ref.ReferenceQueue;import java.util.Date;import java.util.HashMap;import java.util.Map;import java.util.Timer;import java.util.TimerTask;import android.app.Activity;import android.content.Context;public final class ActivityMemoryMonitor{private final static ReferenceQueue<Activity> referenceQueue = new ReferenceQueue<Activity>();private final static Map<PhantomReference<Activity>, String> phantomReferenceMap = new HashMap<PhantomReference<Activity>, String>();private final static String logFile = "activity_memory_monitor.log";private static Timer memoryMonitorTimer = null;public static void setActivityToMonitoringQueue(Activity activity){String activityInfo = activity.toString() + "." + activity.hashCode();phantomReferenceMap.put(new PhantomReference<Activity>(activity, referenceQueue), activityInfo);writeLogToFile(activity, "Activity Created: " + activityInfo);startMonitoringIfNeeded(activity.getApplicationContext());}private static void startMonitoringIfNeeded(Context context){if (memoryMonitorTimer != null){return;}memoryMonitorTimer = new Timer();memoryMonitorTimer.schedule(new MemoryMonitorTask(context), 0, 2000);}private static synchronized void writeLogToFile(Context context, String message){FileOutputStream fos = null;BufferedOutputStream out = null;try{fos = context.openFileOutput(logFile, Context.MODE_APPEND);out = new BufferedOutputStream(fos);String log = new Date().toString() + " " + message + "\n";out.write(log.getBytes());} catch (IOException e){} finally{close(out);close(fos);}}private static void close(Closeable c){if (c == null){return;}try{c.close();} catch (IOException e){}}private static class MemoryMonitorTask extends TimerTask{private Context context;MemoryMonitorTask(Context context){this.context = context;}@Overridepublic void run(){System.gc();Object o = ActivityMemoryMonitor.referenceQueue.poll();if (o != null){writeLogToFile(context, "GC Cllected: " + phantomReferenceMap.get(o));phantomReferenceMap.remove(o);}}}}? 1 楼 zeroblue 2011-10-25 使用时只要在Activity的onCreate方法里写一句：ActivityMemoryMonitor.setActivityToMonitoringQueue(this);