来源: 互联网  发布时间: 2014-02-18

屏蔽返回键

 

 

 

 

	/**
	 * 屏蔽用户的返回键，即监听到返回键，但什么都不做
	 * */

	@Override
	public boolean onKeyDown(int keyCode, KeyEvent event) 
	{
		if (keyCode == KeyEvent.KEYCODE_BACK )
        {
			
			return false;//返回一个false,起到屏蔽的作用
			
        }
		
		return super.onKeyDown(keyCode, event);
	}

 

    

    来源: 互联网  发布时间: 2014-02-18

UIDeviceOrientation 和 UIInterfaceOrientation 设备旋转的用法 （实例）

UIDeviceOrientation      是机器硬件的当前旋转方向   这个你只能取值 不能设置

UIInterfaceOrientation   是你程序界面的当前旋转方向   这个可以设置

 

判断设备现在的方向：

- (BOOL)shouldAutorotateToInterfaceOrientation:(UIInterfaceOrientation)interfaceOrientation
{
    //宣告一個UIDevice指標，並取得目前Device的狀況
    UIDevice *device = [UIDevice currentDevice] ; 
    
    //取得當前Device的方向，來當作判斷敘述。（Device的方向型態為Integer）
    switch (device.orientation) {
        case UIDeviceOrientationFaceUp:
	    NSLog(@"螢幕朝上平躺");
            break;
            
        case UIDeviceOrientationFaceDown:
	    NSLog(@"螢幕朝下平躺");
            break;
            
        //系統無法判斷目前Device的方向，有可能是斜置 
        case UIDeviceOrientationUnknown:
	    NSLog(@"未知方向");
            break;
            
        case UIDeviceOrientationLandscapeLeft:
	    NSLog(@"螢幕向左橫置");
            break;
            
        case UIDeviceOrientationLandscapeRight:
	    NSLog(@"螢幕向右橫置");
            break;
            
        case UIDeviceOrientationPortrait:
	    NSLog(@"螢幕直立");
            break;
            
        case UIDeviceOrientationPortraitUpsideDown:
	    NSLog(@"螢幕直立，上下顛倒");
            break;
            
        default:
	    NSLog(@"無法辨識");
            break;
    }

    // Return YES for supported orientations
    return (interfaceOrientation == UIInterfaceOrientationLandscapeLeft); // 只支持向左横向, YES 表示支持所有方向
}

 

或者

- (BOOL)shouldAutorotateToInterfaceOrientation:(UIInterfaceOrientation)interfaceOrientation
{
    UIDeviceOrientation deviceOrientation = [UIDevice currentDevice].orientation;
    if (UIDeviceOrientationIsLandscape(deviceOrientation)) NSLog(@"横向");    
    else if(UIDeviceOrientationIsPortrait(deviceOrientation)) NSLog(@"纵向");
    
    // // Return YES for supported orientations
    return (interfaceOrientation == UIInterfaceOrientationLandscapeLeft); // 只支持向左横向, YES 表示支持所有方向
}

 

Portrait 表示 纵向，Landscape 表示 横向。

 

typedef enum {
    UIDeviceOrientationUnknown,
    UIDeviceOrientationPortrait,            // Device oriented vertically, home button on the bottom
    UIDeviceOrientationPortraitUpsideDown,  // Device oriented vertically, home button on the top
    UIDeviceOrientationLandscapeLeft,       // Device oriented horizontally, home button on the right
    UIDeviceOrientationLandscapeRight,      // Device oriented horizontally, home button on the left
    UIDeviceOrientationFaceUp,              // Device oriented flat, face up
    UIDeviceOrientationFaceDown             // Device oriented flat, face down
} UIDeviceOrientation;

 

typedef enum {
    UIInterfaceOrientationPortrait           = UIDeviceOrientationPortrait,
    UIInterfaceOrientationPortraitUpsideDown = UIDeviceOrientationPortraitUpsideDown,
    UIInterfaceOrientationLandscapeLeft      = UIDeviceOrientationLandscapeRight,
    UIInterfaceOrientationLandscapeRight     = UIDeviceOrientationLandscapeLeft
} UIInterfaceOrientation;

  

#define UIDeviceOrientationIsPortrait(orientation)  ((orientation) == UIDeviceOrientationPortrait || (orientation) == UIDeviceOrientationPortraitUpsideDown)
#define UIDeviceOrientationIsLandscape(orientation) ((orientation) == UIDeviceOrientationLandscapeLeft || (orientation) == UIDeviceOrientationLandscapeRight)

 

上面是重要的源代码，已经解释的非常清楚。UIDeviceOrientationIsPortrait(orientation) 跟  ((orientation) == UIDeviceOrientationPortrait || (orientation) == UIDeviceOrientationPortraitUpsideDown) 完全是一个意思。

 

 

 

 

    

    来源: 互联网  发布时间: 2014-02-18

ActivityGroup 下 layout_weight不起作用
一直比较喜欢用layout_weight属性来划分屏幕，今天在ActivityGroup中使用，怎么搞都不起作用，最终搞定，原来要给getDecorView()返回的View对象加上LayoutParams ，用法如下：
LayoutParams param = new LayoutParams(LayoutParams.FILL_PARENT,LayoutParams.FILL_PARENT);
如果getDecorView()返回的对象为appview则
appview.setLayoutParams(param);
这样在剩余空间在使用layout_weight属性就起作用了。。