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/* * Copyright (C) 2011 The Android Open Source Project *//w w w . j a v a 2s . c o 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.actionbarsherlock.widget; import android.content.ComponentName; import android.content.Context; import android.content.Intent; import android.content.pm.ResolveInfo; import android.database.DataSetObservable; import android.os.Handler; import android.text.TextUtils; import android.util.Log; import android.util.Xml; import org.xmlpull.v1.XmlPullParser; import org.xmlpull.v1.XmlPullParserException; import org.xmlpull.v1.XmlSerializer; import java.io.FileInputStream; import java.io.FileNotFoundException; import java.io.FileOutputStream; import java.io.IOException; import java.math.BigDecimal; import java.util.ArrayList; import java.util.Collections; import java.util.HashMap; import java.util.LinkedHashSet; import java.util.List; import java.util.Map; import java.util.Set; import java.util.concurrent.Executor; import java.util.concurrent.Executors; /** * <p> * This class represents a data model for choosing a component for handing a * given {@link Intent}. The model is responsible for querying the system for * activities that can handle the given intent and order found activities * based on historical data of previous choices. The historical data is stored * in an application private file. If a client does not want to have persistent * choice history the file can be omitted, thus the activities will be ordered * based on historical usage for the current session. * <p> * </p> * For each backing history file there is a singleton instance of this class. Thus, * several clients that specify the same history file will share the same model. Note * that if multiple clients are sharing the same model they should implement semantically * equivalent functionality since setting the model intent will change the found * activities and they may be inconsistent with the functionality of some of the clients. * For example, choosing a share activity can be implemented by a single backing * model and two different views for performing the selection. If however, one of the * views is used for sharing but the other for importing, for example, then each * view should be backed by a separate model. * </p> * <p> * The way clients interact with this class is as follows: * </p> * <p> * <pre> * <code> * // Get a model and set it to a couple of clients with semantically similar function. * ActivityChooserModel dataModel = * ActivityChooserModel.get(context, "task_specific_history_file_name.xml"); * * ActivityChooserModelClient modelClient1 = getActivityChooserModelClient1(); * modelClient1.setActivityChooserModel(dataModel); * * ActivityChooserModelClient modelClient2 = getActivityChooserModelClient2(); * modelClient2.setActivityChooserModel(dataModel); * * // Set an intent to choose a an activity for. * dataModel.setIntent(intent); * <pre> * <code> * </p> * <p> * <strong>Note:</strong> This class is thread safe. * </p> * * @hide */ class ActivityChooserModel extends DataSetObservable { /** * Client that utilizes an {@link ActivityChooserModel}. */ public interface ActivityChooserModelClient { /** * Sets the {@link ActivityChooserModel}. * * @param dataModel The model. */ public void setActivityChooserModel(ActivityChooserModel dataModel); } /** * Defines a sorter that is responsible for sorting the activities * based on the provided historical choices and an intent. */ public interface ActivitySorter { /** * Sorts the <code>activities</code> in descending order of relevance * based on previous history and an intent. * * @param intent The {@link Intent}. * @param activities Activities to be sorted. * @param historicalRecords Historical records. */ // This cannot be done by a simple comparator since an Activity weight // is computed from history. Note that Activity implements Comparable. public void sort(Intent intent, List<ActivityResolveInfo> activities, List<HistoricalRecord> historicalRecords); } /** * Listener for choosing an activity. */ public interface OnChooseActivityListener { /** * Called when an activity has been chosen. The client can decide whether * an activity can be chosen and if so the caller of * {@link ActivityChooserModel#chooseActivity(int)} will receive and {@link Intent} * for launching it. * <p> * <strong>Note:</strong> Modifying the intent is not permitted and * any changes to the latter will be ignored. * </p> * * @param host The listener's host model. * @param intent The intent for launching the chosen activity. * @return Whether the intent is handled and should not be delivered to clients. * * @see ActivityChooserModel#chooseActivity(int) */ public boolean onChooseActivity(ActivityChooserModel host, Intent intent); } /** * Flag for selecting debug mode. */ private static final boolean DEBUG = false; /** * Tag used for logging. */ private static final String LOG_TAG = ActivityChooserModel.class.getSimpleName(); /** * The root tag in the history file. */ private static final String TAG_HISTORICAL_RECORDS = "historical-records"; /** * The tag for a record in the history file. */ private static final String TAG_HISTORICAL_RECORD = "historical-record"; /** * Attribute for the activity. */ private static final String ATTRIBUTE_ACTIVITY = "activity"; /** * Attribute for the choice time. */ private static final String ATTRIBUTE_TIME = "time"; /** * Attribute for the choice weight. */ private static final String ATTRIBUTE_WEIGHT = "weight"; /** * The default name of the choice history file. */ public static final String DEFAULT_HISTORY_FILE_NAME = "activity_choser_model_history.xml"; /** * The default maximal length of the choice history. */ public static final int DEFAULT_HISTORY_MAX_LENGTH = 50; /** * The amount with which to inflate a chosen activity when set as default. */ private static final int DEFAULT_ACTIVITY_INFLATION = 5; /** * Default weight for a choice record. */ private static final float DEFAULT_HISTORICAL_RECORD_WEIGHT = 1.0f; /** * The extension of the history file. */ private static final String HISTORY_FILE_EXTENSION = ".xml"; /** * An invalid item index. */ private static final int INVALID_INDEX = -1; /** * Lock to guard the model registry. */ private static final Object sRegistryLock = new Object(); /** * This the registry for data models. */ private static final Map<String, ActivityChooserModel> sDataModelRegistry = new HashMap<String, ActivityChooserModel>(); /** * Lock for synchronizing on this instance. */ private final Object mInstanceLock = new Object(); /** * List of activities that can handle the current intent. */ private final List<ActivityResolveInfo> mActivites = new ArrayList<ActivityResolveInfo>(); /** * List with historical choice records. */ private final List<HistoricalRecord> mHistoricalRecords = new ArrayList<HistoricalRecord>(); /** * Context for accessing resources. */ private final Context mContext; /** * The name of the history file that backs this model. */ private final String mHistoryFileName; /** * The intent for which a activity is being chosen. */ private Intent mIntent; /** * The sorter for ordering activities based on intent and past choices. */ private ActivitySorter mActivitySorter = new DefaultSorter(); /** * The maximal length of the choice history. */ private int mHistoryMaxSize = DEFAULT_HISTORY_MAX_LENGTH; /** * Flag whether choice history can be read. In general many clients can * share the same data model and {@link #readHistoricalData()} may be called * by arbitrary of them any number of times. Therefore, this class guarantees * that the very first read succeeds and subsequent reads can be performed * only after a call to {@link #persistHistoricalData()} followed by change * of the share records. */ private boolean mCanReadHistoricalData = true; /** * Flag whether the choice history was read. This is used to enforce that * before calling {@link #persistHistoricalData()} a call to * {@link #persistHistoricalData()} has been made. This aims to avoid a * scenario in which a choice history file exits, it is not read yet and * it is overwritten. Note that always all historical records are read in * full and the file is rewritten. This is necessary since we need to * purge old records that are outside of the sliding window of past choices. */ private boolean mReadShareHistoryCalled = false; /** * Flag whether the choice records have changed. In general many clients can * share the same data model and {@link #persistHistoricalData()} may be called * by arbitrary of them any number of times. Therefore, this class guarantees * that choice history will be persisted only if it has changed. */ private boolean mHistoricalRecordsChanged = true; /** * Hander for scheduling work on client tread. */ private final Handler mHandler = new Handler(); /** * Policy for controlling how the model handles chosen activities. */ private OnChooseActivityListener mActivityChoserModelPolicy; /** * Gets the data model backed by the contents of the provided file with historical data. * Note that only one data model is backed by a given file, thus multiple calls with * the same file name will return the same model instance. If no such instance is present * it is created. * <p> * <strong>Note:</strong> To use the default historical data file clients should explicitly * pass as file name {@link #DEFAULT_HISTORY_FILE_NAME}. If no persistence of the choice * history is desired clients should pass <code>null</code> for the file name. In such * case a new model is returned for each invocation. * </p> * * <p> * <strong>Always use difference historical data files for semantically different actions. * For example, sharing is different from importing.</strong> * </p> * * @param context Context for loading resources. * @param historyFileName File name with choice history, <code>null</code> * if the model should not be backed by a file. In this case the activities * will be ordered only by data from the current session. * * @return The model. */ public static ActivityChooserModel get(Context context, String historyFileName) { synchronized (sRegistryLock) { ActivityChooserModel dataModel = sDataModelRegistry.get(historyFileName); if (dataModel == null) { dataModel = new ActivityChooserModel(context, historyFileName); sDataModelRegistry.put(historyFileName, dataModel); } dataModel.readHistoricalData(); return dataModel; } } /** * Creates a new instance. * * @param context Context for loading resources. * @param historyFileName The history XML file. */ private ActivityChooserModel(Context context, String historyFileName) { mContext = context.getApplicationContext(); if (!TextUtils.isEmpty(historyFileName) && !historyFileName.endsWith(HISTORY_FILE_EXTENSION)) { mHistoryFileName = historyFileName + HISTORY_FILE_EXTENSION; } else { mHistoryFileName = historyFileName; } } /** * Sets an intent for which to choose a activity. * <p> * <strong>Note:</strong> Clients must set only semantically similar * intents for each data model. * <p> * * @param intent The intent. */ public void setIntent(Intent intent) { synchronized (mInstanceLock) { if (mIntent == intent) { return; } mIntent = intent; loadActivitiesLocked(); } } /** * Gets the intent for which a activity is being chosen. * * @return The intent. */ public Intent getIntent() { synchronized (mInstanceLock) { return mIntent; } } /** * Gets the number of activities that can handle the intent. * * @return The activity count. * * @see #setIntent(Intent) */ public int getActivityCount() { synchronized (mInstanceLock) { return mActivites.size(); } } /** * Gets an activity at a given index. * * @return The activity. * * @see ActivityResolveInfo * @see #setIntent(Intent) */ public ResolveInfo getActivity(int index) { synchronized (mInstanceLock) { return mActivites.get(index).resolveInfo; } } /** * Gets the index of a the given activity. * * @param activity The activity index. * * @return The index if found, -1 otherwise. */ public int getActivityIndex(ResolveInfo activity) { List<ActivityResolveInfo> activities = mActivites; final int activityCount = activities.size(); for (int i = 0; i < activityCount; i++) { ActivityResolveInfo currentActivity = activities.get(i); if (currentActivity.resolveInfo == activity) { return i; } } return INVALID_INDEX; } /** * Chooses a activity to handle the current intent. This will result in * adding a historical record for that action and construct intent with * its component name set such that it can be immediately started by the * client. * <p> * <strong>Note:</strong> By calling this method the client guarantees * that the returned intent will be started. This intent is returned to * the client solely to let additional customization before the start. * </p> * * @return An {@link Intent} for launching the activity or null if the * policy has consumed the intent. * * @see HistoricalRecord * @see OnChooseActivityListener */ public Intent chooseActivity(int index) { ActivityResolveInfo chosenActivity = mActivites.get(index); ComponentName chosenName = new ComponentName( chosenActivity.resolveInfo.activityInfo.packageName, chosenActivity.resolveInfo.activityInfo.name); Intent choiceIntent = new Intent(mIntent); choiceIntent.setComponent(chosenName); if (mActivityChoserModelPolicy != null) { // Do not allow the policy to change the intent. Intent choiceIntentCopy = new Intent(choiceIntent); final boolean handled = mActivityChoserModelPolicy.onChooseActivity(this, choiceIntentCopy); if (handled) { return null; } } HistoricalRecord historicalRecord = new HistoricalRecord(chosenName, System.currentTimeMillis(), DEFAULT_HISTORICAL_RECORD_WEIGHT); addHisoricalRecord(historicalRecord); return choiceIntent; } /** * Sets the listener for choosing an activity. * * @param listener The listener. */ public void setOnChooseActivityListener(OnChooseActivityListener listener) { mActivityChoserModelPolicy = listener; } /** * Gets the default activity, The default activity is defined as the one * with highest rank i.e. the first one in the list of activities that can * handle the intent. * * @return The default activity, <code>null</code> id not activities. * * @see #getActivity(int) */ public ResolveInfo getDefaultActivity() { synchronized (mInstanceLock) { if (!mActivites.isEmpty()) { return mActivites.get(0).resolveInfo; } } return null; } /** * Sets the default activity. The default activity is set by adding a * historical record with weight high enough that this activity will * become the highest ranked. Such a strategy guarantees that the default * will eventually change if not used. Also the weight of the record for * setting a default is inflated with a constant amount to guarantee that * it will stay as default for awhile. * * @param index The index of the activity to set as default. */ public void setDefaultActivity(int index) { ActivityResolveInfo newDefaultActivity = mActivites.get(index); ActivityResolveInfo oldDefaultActivity = mActivites.get(0); final float weight; if (oldDefaultActivity != null) { // Add a record with weight enough to boost the chosen at the top. weight = oldDefaultActivity.weight - newDefaultActivity.weight + DEFAULT_ACTIVITY_INFLATION; } else { weight = DEFAULT_HISTORICAL_RECORD_WEIGHT; } ComponentName defaultName = new ComponentName( newDefaultActivity.resolveInfo.activityInfo.packageName, newDefaultActivity.resolveInfo.activityInfo.name); HistoricalRecord historicalRecord = new HistoricalRecord(defaultName, System.currentTimeMillis(), weight); addHisoricalRecord(historicalRecord); } /** * Reads the history data from the backing file if the latter * was provided. Calling this method more than once before a call * to {@link #persistHistoricalData()} has been made has no effect. * <p> * <strong>Note:</strong> Historical data is read asynchronously and * as soon as the reading is completed any registered * {@link DataSetObserver}s will be notified. Also no historical * data is read until this method is invoked. * <p> */ private void readHistoricalData() { synchronized (mInstanceLock) { if (!mCanReadHistoricalData || !mHistoricalRecordsChanged) { return; } mCanReadHistoricalData = false; mReadShareHistoryCalled = true; if (!TextUtils.isEmpty(mHistoryFileName)) { /*AsyncTask.*/SERIAL_EXECUTOR.execute(new HistoryLoader()); } } } private static final Executor SERIAL_EXECUTOR = Executors.newSingleThreadExecutor(); /** * Persists the history data to the backing file if the latter * was provided. Calling this method before a call to {@link #readHistoricalData()} * throws an exception. Calling this method more than one without choosing an * activity has not effect. * * @throws IllegalStateException If this method is called before a call to * {@link #readHistoricalData()}. */ private void persistHistoricalData() { synchronized (mInstanceLock) { if (!mReadShareHistoryCalled) { throw new IllegalStateException("No preceding call to #readHistoricalData"); } if (!mHistoricalRecordsChanged) { return; } mHistoricalRecordsChanged = false; mCanReadHistoricalData = true; if (!TextUtils.isEmpty(mHistoryFileName)) { /*AsyncTask.*/SERIAL_EXECUTOR.execute(new HistoryPersister()); } } } /** * Sets the sorter for ordering activities based on historical data and an intent. * * @param activitySorter The sorter. * * @see ActivitySorter */ public void setActivitySorter(ActivitySorter activitySorter) { synchronized (mInstanceLock) { if (mActivitySorter == activitySorter) { return; } mActivitySorter = activitySorter; sortActivities(); } } /** * Sorts the activities based on history and an intent. If * a sorter is not specified this a default implementation is used. * * @see #setActivitySorter(ActivitySorter) */ private void sortActivities() { synchronized (mInstanceLock) { if (mActivitySorter != null && !mActivites.isEmpty()) { mActivitySorter.sort(mIntent, mActivites, Collections.unmodifiableList(mHistoricalRecords)); notifyChanged(); } } } /** * Sets the maximal size of the historical data. Defaults to * {@link #DEFAULT_HISTORY_MAX_LENGTH} * <p> * <strong>Note:</strong> Setting this property will immediately * enforce the specified max history size by dropping enough old * historical records to enforce the desired size. Thus, any * records that exceed the history size will be discarded and * irreversibly lost. * </p> * * @param historyMaxSize The max history size. */ public void setHistoryMaxSize(int historyMaxSize) { synchronized (mInstanceLock) { if (mHistoryMaxSize == historyMaxSize) { return; } mHistoryMaxSize = historyMaxSize; pruneExcessiveHistoricalRecordsLocked(); sortActivities(); } } /** * Gets the history max size. * * @return The history max size. */ public int getHistoryMaxSize() { synchronized (mInstanceLock) { return mHistoryMaxSize; } } /** * Gets the history size. * * @return The history size. */ public int getHistorySize() { synchronized (mInstanceLock) { return mHistoricalRecords.size(); } } /** * Adds a historical record. * * @param historicalRecord The record to add. * @return True if the record was added. */ private boolean addHisoricalRecord(HistoricalRecord historicalRecord) { synchronized (mInstanceLock) { final boolean added = mHistoricalRecords.add(historicalRecord); if (added) { mHistoricalRecordsChanged = true; pruneExcessiveHistoricalRecordsLocked(); persistHistoricalData(); sortActivities(); } return added; } } /** * Prunes older excessive records to guarantee {@link #mHistoryMaxSize}. */ private void pruneExcessiveHistoricalRecordsLocked() { List<HistoricalRecord> choiceRecords = mHistoricalRecords; final int pruneCount = choiceRecords.size() - mHistoryMaxSize; if (pruneCount <= 0) { return; } mHistoricalRecordsChanged = true; for (int i = 0; i < pruneCount; i++) { HistoricalRecord prunedRecord = choiceRecords.remove(0); if (DEBUG) { Log.i(LOG_TAG, "Pruned: " + prunedRecord); } } } /** * Loads the activities. */ private void loadActivitiesLocked() { mActivites.clear(); if (mIntent != null) { List<ResolveInfo> resolveInfos = mContext.getPackageManager().queryIntentActivities(mIntent, 0); final int resolveInfoCount = resolveInfos.size(); for (int i = 0; i < resolveInfoCount; i++) { ResolveInfo resolveInfo = resolveInfos.get(i); mActivites.add(new ActivityResolveInfo(resolveInfo)); } sortActivities(); } else { notifyChanged(); } } /** * Represents a record in the history. */ public final static class HistoricalRecord { /** * The activity name. */ public final ComponentName activity; /** * The choice time. */ public final long time; /** * The record weight. */ public final float weight; /** * Creates a new instance. * * @param activityName The activity component name flattened to string. * @param time The time the activity was chosen. * @param weight The weight of the record. */ public HistoricalRecord(String activityName, long time, float weight) { this(ComponentName.unflattenFromString(activityName), time, weight); } /** * Creates a new instance. * * @param activityName The activity name. * @param time The time the activity was chosen. * @param weight The weight of the record. */ public HistoricalRecord(ComponentName activityName, long time, float weight) { this.activity = activityName; this.time = time; this.weight = weight; } @Override public int hashCode() { final int prime = 31; int result = 1; result = prime * result + ((activity == null) ? 0 : activity.hashCode()); result = prime * result + (int) (time ^ (time >>> 32)); result = prime * result + Float.floatToIntBits(weight); return result; } @Override public boolean equals(Object obj) { if (this == obj) { return true; } if (obj == null) { return false; } if (getClass() != obj.getClass()) { return false; } HistoricalRecord other = (HistoricalRecord) obj; if (activity == null) { if (other.activity != null) { return false; } } else if (!activity.equals(other.activity)) { return false; } if (time != other.time) { return false; } if (Float.floatToIntBits(weight) != Float.floatToIntBits(other.weight)) { return false; } return true; } @Override public String toString() { StringBuilder builder = new StringBuilder(); builder.append("["); builder.append("; activity:").append(activity); builder.append("; time:").append(time); builder.append("; weight:").append(new BigDecimal(weight)); builder.append("]"); return builder.toString(); } } /** * Represents an activity. */ public final class ActivityResolveInfo implements Comparable<ActivityResolveInfo> { /** * The {@link ResolveInfo} of the activity. */ public final ResolveInfo resolveInfo; /** * Weight of the activity. Useful for sorting. */ public float weight; /** * Creates a new instance. * * @param resolveInfo activity {@link ResolveInfo}. */ public ActivityResolveInfo(ResolveInfo resolveInfo) { this.resolveInfo = resolveInfo; } @Override public int hashCode() { return 31 + Float.floatToIntBits(weight); } @Override public boolean equals(Object obj) { if (this == obj) { return true; } if (obj == null) { return false; } if (getClass() != obj.getClass()) { return false; } ActivityResolveInfo other = (ActivityResolveInfo) obj; if (Float.floatToIntBits(weight) != Float.floatToIntBits(other.weight)) { return false; } return true; } public int compareTo(ActivityResolveInfo another) { return Float.floatToIntBits(another.weight) - Float.floatToIntBits(weight); } @Override public String toString() { StringBuilder builder = new StringBuilder(); builder.append("["); builder.append("resolveInfo:").append(resolveInfo.toString()); builder.append("; weight:").append(new BigDecimal(weight)); builder.append("]"); return builder.toString(); } } /** * Default activity sorter implementation. */ private final class DefaultSorter implements ActivitySorter { private static final float WEIGHT_DECAY_COEFFICIENT = 0.95f; private final Map<String, ActivityResolveInfo> mPackageNameToActivityMap = new HashMap<String, ActivityResolveInfo>(); public void sort(Intent intent, List<ActivityResolveInfo> activities, List<HistoricalRecord> historicalRecords) { Map<String, ActivityResolveInfo> packageNameToActivityMap = mPackageNameToActivityMap; packageNameToActivityMap.clear(); final int activityCount = activities.size(); for (int i = 0; i < activityCount; i++) { ActivityResolveInfo activity = activities.get(i); activity.weight = 0.0f; String packageName = activity.resolveInfo.activityInfo.packageName; packageNameToActivityMap.put(packageName, activity); } final int lastShareIndex = historicalRecords.size() - 1; float nextRecordWeight = 1; for (int i = lastShareIndex; i >= 0; i--) { HistoricalRecord historicalRecord = historicalRecords.get(i); String packageName = historicalRecord.activity.getPackageName(); ActivityResolveInfo activity = packageNameToActivityMap.get(packageName); if (activity != null) { activity.weight += historicalRecord.weight * nextRecordWeight; nextRecordWeight = nextRecordWeight * WEIGHT_DECAY_COEFFICIENT; } } Collections.sort(activities); if (DEBUG) { for (int i = 0; i < activityCount; i++) { Log.i(LOG_TAG, "Sorted: " + activities.get(i)); } } } } /** * Command for reading the historical records from a file off the UI thread. */ private final class HistoryLoader implements Runnable { public void run() { FileInputStream fis = null; try { fis = mContext.openFileInput(mHistoryFileName); } catch (FileNotFoundException fnfe) { if (DEBUG) { Log.i(LOG_TAG, "Could not open historical records file: " + mHistoryFileName); } return; } try { XmlPullParser parser = Xml.newPullParser(); parser.setInput(fis, null); int type = XmlPullParser.START_DOCUMENT; while (type != XmlPullParser.END_DOCUMENT && type != XmlPullParser.START_TAG) { type = parser.next(); } if (!TAG_HISTORICAL_RECORDS.equals(parser.getName())) { throw new XmlPullParserException("Share records file does not start with " + TAG_HISTORICAL_RECORDS + " tag."); } List<HistoricalRecord> readRecords = new ArrayList<HistoricalRecord>(); while (true) { type = parser.next(); if (type == XmlPullParser.END_DOCUMENT) { break; } if (type == XmlPullParser.END_TAG || type == XmlPullParser.TEXT) { continue; } String nodeName = parser.getName(); if (!TAG_HISTORICAL_RECORD.equals(nodeName)) { throw new XmlPullParserException("Share records file not well-formed."); } String activity = parser.getAttributeValue(null, ATTRIBUTE_ACTIVITY); final long time = Long.parseLong(parser.getAttributeValue(null, ATTRIBUTE_TIME)); final float weight = Float.parseFloat(parser.getAttributeValue(null, ATTRIBUTE_WEIGHT)); HistoricalRecord readRecord = new HistoricalRecord(activity, time, weight); readRecords.add(readRecord); if (DEBUG) { Log.i(LOG_TAG, "Read " + readRecord.toString()); } } if (DEBUG) { Log.i(LOG_TAG, "Read " + readRecords.size() + " historical records."); } synchronized (mInstanceLock) { Set<HistoricalRecord> uniqueShareRecords = new LinkedHashSet<HistoricalRecord>(readRecords); // Make sure no duplicates. Example: Read a file with // one record, add one record, persist the two records, // add a record, read the persisted records - the // read two records should not be added again. List<HistoricalRecord> historicalRecords = mHistoricalRecords; final int historicalRecordsCount = historicalRecords.size(); for (int i = historicalRecordsCount - 1; i >= 0; i--) { HistoricalRecord historicalRecord = historicalRecords.get(i); uniqueShareRecords.add(historicalRecord); } if (historicalRecords.size() == uniqueShareRecords.size()) { return; } // Make sure the oldest records go to the end. historicalRecords.clear(); historicalRecords.addAll(uniqueShareRecords); mHistoricalRecordsChanged = true; // Do this on the client thread since the client may be on the UI // thread, wait for data changes which happen during sorting, and // perform UI modification based on the data change. mHandler.post(new Runnable() { public void run() { pruneExcessiveHistoricalRecordsLocked(); sortActivities(); } }); } } catch (XmlPullParserException xppe) { Log.e(LOG_TAG, "Error reading historical recrod file: " + mHistoryFileName, xppe); } catch (IOException ioe) { Log.e(LOG_TAG, "Error reading historical recrod file: " + mHistoryFileName, ioe); } finally { if (fis != null) { try { fis.close(); } catch (IOException ioe) { /* ignore */ } } } } } /** * Command for persisting the historical records to a file off the UI thread. */ private final class HistoryPersister implements Runnable { public void run() { FileOutputStream fos = null; List<HistoricalRecord> records = null; synchronized (mInstanceLock) { records = new ArrayList<HistoricalRecord>(mHistoricalRecords); } try { fos = mContext.openFileOutput(mHistoryFileName, Context.MODE_PRIVATE); } catch (FileNotFoundException fnfe) { Log.e(LOG_TAG, "Error writing historical recrod file: " + mHistoryFileName, fnfe); return; } XmlSerializer serializer = Xml.newSerializer(); try { serializer.setOutput(fos, null); serializer.startDocument("UTF-8", true); serializer.startTag(null, TAG_HISTORICAL_RECORDS); final int recordCount = records.size(); for (int i = 0; i < recordCount; i++) { HistoricalRecord record = records.remove(0); serializer.startTag(null, TAG_HISTORICAL_RECORD); serializer.attribute(null, ATTRIBUTE_ACTIVITY, record.activity.flattenToString()); serializer.attribute(null, ATTRIBUTE_TIME, String.valueOf(record.time)); serializer.attribute(null, ATTRIBUTE_WEIGHT, String.valueOf(record.weight)); serializer.endTag(null, TAG_HISTORICAL_RECORD); if (DEBUG) { Log.i(LOG_TAG, "Wrote " + record.toString()); } } serializer.endTag(null, TAG_HISTORICAL_RECORDS); serializer.endDocument(); if (DEBUG) { Log.i(LOG_TAG, "Wrote " + recordCount + " historical records."); } } catch (IllegalArgumentException iae) { Log.e(LOG_TAG, "Error writing historical recrod file: " + mHistoryFileName, iae); } catch (IllegalStateException ise) { Log.e(LOG_TAG, "Error writing historical recrod file: " + mHistoryFileName, ise); } catch (IOException ioe) { Log.e(LOG_TAG, "Error writing historical recrod file: " + mHistoryFileName, ioe); } finally { if (fos != null) { try { fos.close(); } catch (IOException e) { /* ignore */ } } } } } }