android.util.SparseBooleanArray#append ( )源码实例Demo

private void readSparseBooleanArrayInternal(SparseBooleanArray outVal, int N) {
    while (N > 0) {
        int key = readInt();
        boolean value = this.readByte() == 1;
        //Log.i(TAG, "Unmarshalling key=" + key + " value=" + value);
        outVal.append(key, value);
        N--;
    }
}
 

/**
 * Extracts the tab information from a given tab state stream.
 *
 * @param stream   The stream pointing to the tab state file to be parsed.
 * @param callback A callback to be streamed updates about the tab state information being read.
 * @param tabIds   A mapping of tab ID to whether the tab is an off the record tab.
 * @param forMerge Whether this state file was read as part of a merge.
 * @return The next available tab ID based on the maximum ID referenced in this state file.
 */
public static int readSavedStateFile(
        DataInputStream stream, @Nullable OnTabStateReadCallback callback,
        @Nullable SparseBooleanArray tabIds, boolean forMerge) throws IOException {
    if (stream == null) return 0;
    long time = SystemClock.uptimeMillis();
    int nextId = 0;
    boolean skipUrlRead = false;
    boolean skipIncognitoCount = false;
    final int version = stream.readInt();
    if (version != SAVED_STATE_VERSION) {
        // We don't support restoring Tab data from before M18.
        if (version < 3) return 0;
        // Older versions are missing newer data.
        if (version < 5) skipIncognitoCount = true;
        if (version < 4) skipUrlRead = true;
    }

    final int count = stream.readInt();
    final int incognitoCount = skipIncognitoCount ? -1 : stream.readInt();
    final int incognitoActiveIndex = stream.readInt();
    final int standardActiveIndex = stream.readInt();
    if (count < 0 || incognitoActiveIndex >= count || standardActiveIndex >= count) {
        throw new IOException();
    }

    for (int i = 0; i < count; i++) {
        int id = stream.readInt();
        String tabUrl = skipUrlRead ? "" : stream.readUTF();
        if (id >= nextId) nextId = id + 1;
        if (tabIds != null) tabIds.append(id, true);

        Boolean isIncognito = (incognitoCount < 0) ? null : i < incognitoCount;
        if (callback != null) {
            callback.onDetailsRead(i, id, tabUrl, isIncognito,
                    i == standardActiveIndex, i == incognitoActiveIndex);
        }
    }

    if (forMerge) {
        logExecutionTime("ReadMergedStateTime", time);
        int tabCount = count + ((incognitoCount > 0) ? incognitoCount : 0);
        RecordHistogram.recordLinearCountHistogram(
                "Android.TabPersistentStore.MergeStateTabCount",
                tabCount, 1, 200, 200);
    }

    logExecutionTime("ReadSavedStateTime", time);

    return nextId;
}
 

/**
 * Extracts the tab information from a given tab state stream.
 *
 * @param stream   The stream pointing to the tab state file to be parsed.
 * @param callback A callback to be streamed updates about the tab state information being read.
 * @param tabIds   A mapping of tab ID to whether the tab is an off the record tab.
 * @param forMerge Whether this state file was read as part of a merge.
 * @return The next available tab ID based on the maximum ID referenced in this state file.
 */
public static int readSavedStateFile(
        DataInputStream stream, @Nullable OnTabStateReadCallback callback,
        @Nullable SparseBooleanArray tabIds, boolean forMerge) throws IOException {
    if (stream == null) return 0;
    long time = SystemClock.uptimeMillis();
    int nextId = 0;
    boolean skipUrlRead = false;
    boolean skipIncognitoCount = false;
    final int version = stream.readInt();
    if (version != SAVED_STATE_VERSION) {
        // We don't support restoring Tab data from before M18.
        if (version < 3) return 0;
        // Older versions are missing newer data.
        if (version < 5) skipIncognitoCount = true;
        if (version < 4) skipUrlRead = true;
    }

    final int count = stream.readInt();
    final int incognitoCount = skipIncognitoCount ? -1 : stream.readInt();
    final int incognitoActiveIndex = stream.readInt();
    final int standardActiveIndex = stream.readInt();
    if (count < 0 || incognitoActiveIndex >= count || standardActiveIndex >= count) {
        throw new IOException();
    }

    for (int i = 0; i < count; i++) {
        int id = stream.readInt();
        String tabUrl = skipUrlRead ? "" : stream.readUTF();
        if (id >= nextId) nextId = id + 1;
        if (tabIds != null) tabIds.append(id, true);

        Boolean isIncognito = (incognitoCount < 0) ? null : i < incognitoCount;
        if (callback != null) {
            callback.onDetailsRead(i, id, tabUrl, isIncognito,
                    i == standardActiveIndex, i == incognitoActiveIndex);
        }
    }

    if (forMerge) {
        logExecutionTime("ReadMergedStateTime", time);
        int tabCount = count + ((incognitoCount > 0) ? incognitoCount : 0);
        RecordHistogram.recordLinearCountHistogram(
                "Android.TabPersistentStore.MergeStateTabCount",
                tabCount, 1, 200, 200);
    }

    logExecutionTime("ReadSavedStateTime", time);

    return nextId;
}