来源: 互联网  发布时间: 2014-02-18

格式化帖子时间，根据不同的值显示不同的时间
public static String getSendedTime(long oldTime) {
String sTime = null;
long today0HourTime = getTodayTimeMillis();
if (oldTime < today0HourTime) {
long lTime = today0HourTime - oldTime;
int num = (int) (lTime / oneDay);
if (num >= 0 && num <2) {
sTime =  strTime[num];
}else if(num >= 2 && num <= 6){
sTime =  strTime[2];
}else{
sTime = getTimeByLong(oldTime, "M月d日");
}
} else {
sTime =  getTimeByLong(oldTime, "HH:mm");
}
return sTime;
}

public static String getTimeByLong(long tLong, String format) {
String strDate = "";
Calendar cal = Calendar.getInstance();
cal.setTimeInMillis(tLong);
cal.setTimeZone(TimeZone.getTimeZone("GMT+8"));
SimpleDateFormat sdf = new SimpleDateFormat(format);
strDate = sdf.format(cal.getTime());
return strDate;
}

private static long getTodayTimeMillis() {
Calendar cal = Calendar.getInstance();
cal.set(Calendar.HOUR_OF_DAY, 0);
cal.set(Calendar.SECOND, 0);
cal.set(Calendar.MINUTE, 0);
cal.set(Calendar.MILLISECOND, 0);
return cal.getTimeInMillis();
}

// *******************************************************
private final static long oneDay = 24 * 60 * 60 * 1000;
private static String[] strTime = { "昨天", "前天", "三天前" };

    

    来源: 互联网  发布时间: 2014-02-18

视图切换的动画效果

为了避免视图之间切换的呆板问题，在IPHONE中引入了转换动画效果，分别在UIKit.framework和QuartzCore.framework中，后者的动画类型要比前者丰富一些。

 

- (IBAction)switchViews:(id)sender{
    //准备动画
	[UIView beginAnimations:@"animationID" context:nil];
    //动画播放持续时间
	[UIView setAnimationDuration:0.5f];
	//动画速度
	[UIView setAnimationCurve:UIViewAnimationCurveEaseInOut];
	[UIView setAnimationRepeatAutoreverses:NO];
	
	UIButton *theButton = (UIButton *)sender;
	
	//动画方向
	switch (theButton.tag) {
		case 0:
			[UIView setAnimationTransition:UIViewAnimationTransitionFlipFromLeft forView:self.view cache:YES];
			break;
		case 1:
			[UIView setAnimationTransition:UIViewAnimationTransitionFlipFromRight forView:self.view cache:YES]; 	 
			break;
		case 2:
			[UIView setAnimationTransition:UIViewAnimationTransitionCurlUp forView:self.view cache:YES];
			break;
		case 3:
			[UIView setAnimationTransition:UIViewAnimationTransitionCurlDown forView:self.view cache:YES];
			break;
		default:
			break;
	}
	
	[self.view exchangeSubviewAtIndex:1 withSubviewAtIndex:0];
	[UIView commitAnimations];
}

 

下面的动画需要导入QuartzCore.framework库，并在实现文件中导入。

 

#import <QuartzCore/QuartzCore.h>

- (IBAction)switchViews:(id)sender{
    //准备动画
	CATransition *animation = [CATransition animation];
    animation.delegate = self;
	//动画播放持续时间
    animation.duration = 0.5f;
	//动画速度
    animation.timingFunction = UIViewAnimationCurveEaseInOut;
	animation.fillMode = kCAFillModeForwards;
	animation.removedOnCompletion = NO;
	
	UIButton *theButton = (UIButton *)sender;
	
	//动画效果
	switch (theButton.tag) {
		case 0:
			animation.type = @"cube";
			break;
		case 1:
			animation.type = @"suckEffect";
			break;
		case 2:
			animation.type = @"oglFlip";
			break;
		case 3:
			animation.type = @"rippleEffect";
			break;
		case 4:
			animation.type = @"pageCurl";
			break;
		case 5:
			animation.type = @"pageUnCurl";
			break;
		case 6:
			animation.type = @"cameraIrisHollowOpen ";
			break;
		case 7:
			animation.type = @"cameraIrisHollowClose ";
			break;
		default:
			break;
	}
	
	[self.view.layer addAnimation:animation forKey:@"animation"];
    [self.view exchangeSubviewAtIndex:1 withSubviewAtIndex:0];
}

 

下面的动画同样需要导入QuartzCore.framework库，并在实现文件中导入。

 

#import <QuartzCore/QuartzCore.h>
- (IBAction)switchViews:(id)sender{
	CATransition *animation = [CATransition animation];
    animation.duration = 0.5f;
    animation.timingFunction = UIViewAnimationCurveEaseInOut;
	animation.fillMode = kCAFillModeForwards;
	
	UIButton *theButton = (UIButton *)sender;
	
	switch (theButton.tag) {
		case 0:
		    /*动画效果

			       kCATransitionFade

			       kCATransitionMoveIn

			       kCATransitionPush

			       kCATransitionReveal

			*/
			animation.type = kCATransitionPush;
			/*动画方向

			       kCATransitionFromRight

			       kCATransitionFromLeft

			       kCATransitionFromTop

			       kCATransitionFromBottom

		    */
			animation.subtype = kCATransitionFromTop;
			break;
		case 1:
			animation.type = kCATransitionMoveIn;
			animation.subtype = kCATransitionFromTop;
			break;
		case 2:
			animation.type = kCATransitionReveal;
			animation.subtype = kCATransitionFromTop;
			break;
		case 3:
			animation.type = kCATransitionFade;
			animation.subtype = kCATransitionFromTop;
			break;
		default:
			break;
	}
	
	[self.view.layer addAnimation:animation forKey:@"animation"];
}

 

UIKit.framework中的动画是对UIView的，而QuartzCore.framework是针对视图的属性layer来实现的，后者与视图动画比起来，具备更大的优势，更容易进行转换，倾斜，放大，缩小等等。

    

    来源: 互联网  发布时间: 2014-02-18

控制不同的文字字体
  TextView对象中有许多与字形相关的方法，使用setTextSize方法来改变字体大小，用setTypeface方法来指定使用字体等等。
  如果你想使用内部默认的Typeface，用defaultFromStyle()方法即可。但是，如果你想要通过外部的资源来构造Typeface，步骤如下：
  1. 事先在assets目录下创建一个fonts文件夹
  2. 放入要使用的字体文件(.ttf)
  3. 提供相对路径给createFromAsset()来创建Typeface对象
  使用外部Typeface如下：
  eg.

textview.setTypeface(Typeface.createFromAsset(getAssets(),"fonts/HandmadeTypewriter.ttf"));

   使用内部Typeface，如下：
  

 website.setTypeface(Typeface.defaultFromStyle(Typeface.BOLD));

   完整代码：
  

package com.kevin.textview;

import android.app.Activity;
import android.content.res.Resources;
import android.graphics.Typeface;
import android.graphics.drawable.Drawable;
import android.os.Bundle;
import android.widget.TextView;

public class TextViewActivity extends Activity {
	private TextView website, email, phone;
    /** Called when the activity is first created. */
    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.main);
        website = (TextView) findViewById(R.id.tv_website);
        email = (TextView)findViewById(R.id.tv_email);
        phone = (TextView) findViewById(R.id.tv_phone);
        // 设置文本值
        website.setText(R.string.website);
        email.setText(R.string.email);
        phone.setText(R.string.phone);
        
        // 设置字体大小
        website.setTextSize(20);
        // 设置字体
        /*
         * 使用内部默认的Typeface，用defaultFromStyle()方法
         * 如果你想要通过外部的资源来构造Typeface，步骤如下：
         * 1. 事先在assets目录下创建一个fonts文件夹
         * 2. 放入要使用的字体文件(.ttf)
         * 3. 提供相对路径给createFromAsset()来创建Typeface对象
         */
           website.setTypeface(Typeface.defaultFromStyle(Typeface.BOLD));        
    }
}