2011年3月23日

HTC 手機重設方式(Reset)

在手機關機的情況下，按住調低音量鍵，然後快速按下電源鍵。
等待畫面上出現 3 個 Android 影像，然後放開調低音量鍵。
按下調低音量鍵，選取清理磁碟空間，然後按下電源鍵。
按下調低音量鍵，開始執行出廠重設。
張貼者： 於 上午10:56 0 意見
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2011年3月22日

UIActivityIndicatorView : WaitView implementation

Header file --------------------------------------------------

//
//  WaitView.h
//  UIActivityIndicatorView
//
//  Created by Lin, Justin on 2011/3/22.
//  Copyright 2011 __MyCompanyName__. All rights reserved.
//

#import


@interface WaitView : NSObject {

UIActivityIndicatorView *activityIndicator;
}

-(void) endWait;

- (void) beginWait;

@end

Source file --------------------------------------------------
//
//  WaitView.m
//  UIActivityIndicatorView
//
//  Created by Lin, Justin on 2011/3/22.
//  Copyright 2011 __MyCompanyName__. All rights reserved.
//

#import "WaitView.h"

@interface WaitView(PrivateMethods)

- (UIView *) mainWindow;
- (void) startWaitAnimation;
- (void) stopWaitAnimation;

@end

@implementation WaitView

- (UIView *) mainWindow {

return [[[UIApplication sharedApplication] windows] objectAtIndex:0];
}

- (void) startWaitAnimation {
if (activityIndicator != nil) {
return;
}
activityIndicator = [[UIActivityIndicatorView alloc] initWithActivityIndicatorStyle:UIActivityIndicatorViewStyleGray];
[activityIndicator setFrame:CGRectMake(135, 125, 24, 24)];
[activityIndicator setHidesWhenStopped:YES];
[[self mainWindow] addSubview:activityIndicator];
[activityIndicator startAnimating];
}

- (void) stopWaitAnimation {
if (activityIndicator == nil) {
return;
}
[activityIndicator stopAnimating];
[activityIndicator removeFromSuperview];
activityIndicator = nil;
}

-(void) endWait {
// stop thread
    [NSThread detachNewThreadSelector: @selector(stopWaitAnimation) toTarget:self withObject:nil];
}

- (void) beginWait {
// start thread
    [NSThread detachNewThreadSelector: @selector(startWaitAnimation) toTarget:self withObject:nil];
}

@end

張貼者： 於 下午4:56 0 意見
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2011年3月21日

[轉貼] JavaScript Touch and Gesture Events iPhone and Android

JavaScript Touch and Gesture Events iPhone and Android

There are quite a few sites that describe the touch and gesture events that can be used in the mobile version of WebKit running on iPhone and iPod Touch. There is, however, not so much info with regards to Android. I've placed a few links at the bottom of this article that contain information used to compile this brief explanation.
Touch events are a bit like mouse events, but there are some very important differences when it comes to touch vs. mouse:
  • A touch is very hard to keep steady whilst a mouse can stay at a fixed position - this means that we go from a touchStart event directly to a touchMove event. Unlike a mouse where a mouseDown event is likely to fire without being followed up by a mouseMove event.
  • There is no mouseOver equivalent since a touch can be discontinuous, i.e., we can get from point A to point B without the need of drawing a continuous line between these points.
  • A touch is an averaged point taken from the surface area in contact with the pointing device (your finger) translated to pixel coordinates - like finding the centre of a circle. A mouse is very precise and there is no averaging that needs to be done. What I'm trying to say is that a touch is not as accurate as a mouse.

Android and iPhone touch events

Android and iPhone versions of WebKit have some touch events in common:
  • touchstart - triggered when a touch is initiated. Mouse equivalent - mouseDown
  • touchmove - triggered when a touch moves. Mouse equivalent - mouseMove
  • touchend - triggered when a touch ends. Mouse equivalent - mouseUp. This one is a bit special on the iPhone - see below
  • touchcancel - bit of a mystery
Example:
document.addEventListener('touchstart', function(event) {
    alert(event.touches.length);
}, false);

The Event object

As you may have noticed above, the event object contains an array called touches (in Androids case, the event object also containes a touch object - at this stage, touches has always a length of 1 in Android so event.touches[0] === event.touch). The touches array is Apples way of handling multi-touch events - but more on that later.
A touch object contains pretty much the same data as a mouse event such as pageX, pageY etc...

Example:
document.addEventListener('touchmove', function(event) {
    event.preventDefault();
    var touch = event.touches[0];
    console.log("Touch x:" + touch.pageX + ", y:" + touch.pageY);
}, false);

What about a click?

mouseClick events are triggered after a touchStart, touchEnd event sequence. A reason for mouseClick events not triggering can be that the event propagates further and a touchMove being initiated - this will cancel the mouseClick event sequence.

iPhone Touch and Gesture Events


Apples WebKit implementation has a few things that are different from the Android implementation. The touchEnd event removes the current touch from the event.touches array. Instead, we have to look inside the event.changedTouches array.

Apples event object for touch events

The event object contains the following arrays:
  • touches - contains touch information upon touchStart and touchMove not touchEnd events
  • targetTouches - contains information for touches originating from the same target element
  • changedTouches - contains touch information upon all touch events

Gesture events

Apple supports gestures which are mult-touch events such as "pinching" and "rotating":
  • gesturestart - triggered when initiating a multi-touch event
  • gesturechange - triggered when multiple touches move
  • gestureend - triggered when a multi-touch event ends
The event object for gesture events looks very different. It contains scale and rotation values and no touch objects.

Example:
document.addEventListener('gesturechange', function(event) {
    event.preventDefault();
    console.log("Scale: " + event.scale + ", Rotation: " + event.rotation);
}, false);

Event table

touchstarttouchmovetouchendgesturestartgesturemovegestureend
Androidyyynnn
iPhoneyyyyyy
has event.touchesyyynnn
(iPhone) has event.scale and event.rotationnnnyyy
(iPhone) touch in event.touchesyyn---
(iPhone) touch in event.changedTouchesyyy---

Links

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