android.os.Parcel#dataAvail ( )源码实例Demo

private UndoBuffer(Parcel in) {
    this();
    int len = in.readInt();
    while( in.dataAvail() > 0 && len-- > 0){
        TextChange item = new TextChange();
        item.start = in.readInt();
        item.oldtext = in.readString();
        item.newtext = in.readString();
        if ( item.newtext == null ){
            item.newtext = "";
        }
        if ( item.oldtext == null ){
            item.oldtext = "";
        }
        mBuffer.add(item);
        mCurrentSize += item.newtext.length() + item.oldtext.length();
    }
}
 

public Presence(Parcel source) {
    mStatus = source.readInt();
    mStatusText = source.readString();
    mAvatarData = source.createByteArray();
    mAvatarType = source.readString();
    mClientType = source.readInt();
    // TODO - what ClassLoader should be passed to readMap?
    // TODO - switch to Bundle
    mExtendedInfo = source.readHashMap(null);

    //this may not exist for older persisted presence data
    if (source.dataAvail() > 0)
        mResource = source.readString();

    if (source.dataAvail() > 0) {
        long timeLastSeen = source.readLong();
        if (timeLastSeen != -1)
            mLastSeen = new Date(timeLastSeen);
    }
}
 

private UndoBuffer(Parcel in) {
    this();
    int len = in.readInt();
    while( in.dataAvail() > 0 && len-- > 0){
        TextChange item = new TextChange();
        item.start = in.readInt();
        item.oldtext = in.readString();
        item.newtext = in.readString();
        if ( item.newtext == null ){
            item.newtext = "";
        }
        if ( item.oldtext == null ){
            item.oldtext = "";
        }
        mBuffer.add(item);
        mCurrentSize += item.newtext.length() + item.oldtext.length();
    }
}
 

public RevokeMsgInfoImpl(Parcelable o) {
    if (o == null) throw new NullPointerException("RevokeMsgInfo == null");
    Parcel p = Parcel.obtain();
    try {
        o.writeToParcel(p, 0);
        p.setDataPosition(0);
        istroop = p.readInt();
        shmsgseq = p.readLong();
        friendUin = p.readString();
        sendUin = p.readString();
        msgUid = p.readLong();
        time = p.readLong();
        if (p.dataAvail() > 0) authorUin = p.readString();
        if (p.dataAvail() > 0) opType = p.readInt();
    } catch (Exception e) {
        log(e);
    }
    p.recycle();
    String summery = o.toString();
    int keyIndex = summery.indexOf("fromuin");
    if (keyIndex == -1) {
        log("RevokeMsgInfoImpl/E indexOf('fromuin') == -1, leave fromUin null");
        return;
    }
    int valueStart = summery.indexOf('=', keyIndex) + 1;
    if (summery.charAt(valueStart) == ' ') valueStart++;
    int end1 = summery.indexOf(',', valueStart);
    int end2 = summery.indexOf(' ', valueStart);
    if (end1 == -1) end1 = summery.length() - 1;
    if (end2 == -1) end2 = summery.length() - 1;
    int end = Math.min(end1, end2);
    String str = summery.substring(valueStart, end);
    if (str.equals("null")) {
        fromUin = null;
    } else {
        fromUin = str;
    }
}
 

VisualState(Parcel in) {
    super(in);

    if (in.dataAvail() > 0) {
        int side = in.readInt();
        float dockVerticalPositionPercent = in.readFloat();
        mSidePosition = new SideDock.SidePosition(side, dockVerticalPositionPercent);
    }
    if (in.dataAvail() > 0) {
        mSelectedSectionId = new HoverMenu.SectionId(in.readString());
    }
}
 

public SdlPacket(Parcel p) {
	this.version = p.readInt();
	this.encryption = (p.readInt() == 0) ? false : true;
	this.frameType = p.readInt();
	this.serviceType = p.readInt();
	this.frameInfo = p.readInt();
	this.sessionId = p.readInt();
	this.dataSize = p.readInt();
	this.messageId = p.readInt();
	if(p.readInt() == 1){ //We should have a payload attached
		payload = new byte[dataSize];
		p.readByteArray(payload);
	}

	this.priorityCoefficient = p.readInt();

	if(p.dataAvail() > EXTRA_PARCEL_DATA_LENGTH) {	//See note on constant for why not 0
		try {
			messagingVersion = p.readInt();
			if (messagingVersion >= 2) {
				if (p.readInt() == 1) { //We should have a transport type attached
					this.transportRecord = (TransportRecord) p.readParcelable(TransportRecord.class.getClassLoader());
				}
			}
		}catch (RuntimeException e){
			DebugTool.logError("Error creating packet from parcel", e);
		}
	}
}
 

public SdlPacket(Parcel p) {
	this.version = p.readInt();
	this.encryption = (p.readInt() == 0) ? false : true;
	this.frameType = p.readInt();
	this.serviceType = p.readInt();
	this.frameInfo = p.readInt();
	this.sessionId = p.readInt();
	this.dataSize = p.readInt();
	this.messageId = p.readInt();
	if(p.readInt() == 1){ //We should have a payload attached
		payload = new byte[dataSize];
		p.readByteArray(payload);
	}

	this.priorityCoefficient = p.readInt();

	if(p.dataAvail() > EXTRA_PARCEL_DATA_LENGTH) {	//See note on constant for why not 0
		try {
			messagingVersion = p.readInt();
			if (messagingVersion >= 2) {
				if (p.readInt() == 1) { //We should have a transport type attached
					this.transportRecord = (TransportRecord) p.readParcelable(TransportRecord.class.getClassLoader());
				}
			}
		}catch (RuntimeException e){
			DebugTool.logError("Error creating packet from parcel", e);
		}
	}
}