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    ▪创设自定义的音频播放应用程序        创建自定义的音频播放应用程序    Android包含了一个MediaPlayer类，这个类可以用来播放和控制音频和视频。现在我们使用音频功能。MediaPlayer类可用于控制播放的音频/视频文件和流     最.........
    ▪ CorePlot：用图片定做坐标轴标签        CorePlot：用图片定制坐标轴标签原文：http://stackoverflow.com/questions/6748996/how-to-set-custom-tick-marks-in-core-plot-to-iconsAxis label 可以使用任何 CPTLayer（CALayer 子类）作为标签。用UIImage  作为 CPTLayer 的背.........
    ▪ UIScrollView UITableView 下提刷新代码       UIScrollView UITableView 上提刷新代码http://www.cocoachina.com/bbs/job.php?action=download&aid=26207   自从 Tweetie 大获成功以后，下拉刷新几乎成了所有 App 的内容更新操作方式。如果你不想落入俗套，可以.........

[1]创设自定义的音频播放应用程序
    来源: 互联网  发布时间: 2014-02-18
创建自定义的音频播放应用程序

    Android包含了一个MediaPlayer类，这个类可以用来播放和控制音频和视频。现在我们使用音频功能。MediaPlayer类可用于控制播放的音频/视频文件和流

    最简单的MediaPlayer示例是能否与应用程序一起打包的音频文件，也就是音频文件放在原始资源里面。所以，我们在项目的res文件夹下新建一个文件，叫raw，并加入音频文件。

    1.启动媒体播放器

    位音频文件创建MeidaPlayer非常简单，可以使用静态方法create实例化一个MediaPlayer对象，传入作为上下文的this（活动将源自它）以及音频文件生成的ziyuanID。

    MediaPlayer mediaPlayer=MediaPlayer.create(this.R.raw.androidMp3);

    当然，也可以用构造方法实例化一个MediaPlayer对象：MediaPlayer mediaPlayer=new MediaPlayer();

    之后就可以用mediaPlayer.start();来播放文件了。

      2.控制播放

      MediaPlayer类有多个嵌套的类，他们是监听MedaiPlayer所发送事件的借口。这些事件与状态变化有关。例如，MediaPlayer将对实现OnCompletionListener并通过setOnCompletionListener注册的类调用onCompletion方法，该操作将在音频文件正在播放时执行。下面是一个完整的示例，该活动将无限次的重复，通过使用OnCompletionLitener播放相同的音频文件。在onStart方法中初始化MediaPlayer对象并开始播放；在onStop方法中停止播放和释放资源。

   package com.example.musicdemo;
import android.media.MediaPlayer;
import android.media.MediaPlayer.OnCompletionListener;
import android.os.Bundle;
import android.app.Activity;
import android.view.Menu;
import android.view.MenuItem;
import android.support.v4.app.NavUtils;


public class MainActivity extends Activity implements OnCompletionListener{
    MediaPlayer mediaPlay;
    
    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
       
    }

@Override
protected void onStart() {
super.onStart();
mediaPlay=MediaPlayer.create(this,R.raw.android);
mediaPlay.setOnCompletionListener(this);
mediaPlay.start();
}

@Override
protected void onStop() {
super.onStop();
mediaPlay.stop();
mediaPlay.release();
}

public void onCompletion(MediaPlayer mp) {
mediaPlay.start();
}

}

    当然，这可以在没有OnCompletionListener的情况下完成，只需简单地通过使用setLooping(true)方法将MediaPlayer设置为循环播放。

    MediaPlayer状态图


    回放控制音频/视频文件和流的管理是作为一个状态机。下面的图显示了生命周期和一个MediaPlayer对象由支持回放控制操作。椭圆表示状态可能驻留在一个MediaPlayer对象。弧线代表回放控制操作,驱动对象状态转换。有两种类型的弧线。用一个弧线箭头代表同步方法调用头,而那些有双箭头代表异步方法调用负责人。



    
[2] CorePlot：用图片定做坐标轴标签
    来源: 互联网  发布时间: 2014-02-18
CorePlot：用图片定制坐标轴标签

原文：http://stackoverflow.com/questions/6748996/how-to-set-custom-tick-marks-in-core-plot-to-icons

Axis label 可以使用任何 CPTLayer（CALayer 子类）作为标签。用UIImage  作为 CPTLayer 的背景层即可定制轴标签。有许多Core Plot 的使用定制轴标签的例子，虽然他们用的是文本标签。

有两种方法定制图形类的轴标签：

1、 graph的labeling policy设置为CPTAxisLabelingPolicyNone。创建NSSet，放入所有 AxisLabel，然后将坐标轴的 axisLabels 属性设置为 NSSet。如果用这种方法，你需要提供major/minor tick的location。

2、labeling policy 设置为其他策略，以产生 major/minor tick。然后实现axis:shouldUpdateAxisLabelsAtLocations:委托方法。在方法中，在指定的location创建新的label 然后返回 No 以忽略默认的标签。

Jul 19 '11 at 22:46

Eric Skroch

 

根据 Eric 的说法，我编写了一些代码，以供参考：

if (yAxisIcons) {

      int custonLabelsCount = [self.yAxisIcons count];

       NSMutableArray *customLabels =[NSMutableArray arrayWithCapacity:custonLabelsCount];

     for (NSUInteger i = 0; i <custonLabelsCount; i++)

      {

         NSNumber*tickLocation = [NSNumber numberWithInt:i];

         NSString *file =[yAxisIcons objectAtIndex:i];

         UIImage *icon =[UIImage imageNamed:file];

         CPImageLayer*layer; // My custom CPLayer subclass - see code below

         CGFloatnativeHeight = 1; 

         CGFloatnativeWidth = 1; 

 

         if (icon) { 

           layer = [[CPImageLayer alloc] initWithImage:icon];

            nativeWidth = 20;//CGImageGetWidth(icon.CGImage);

           nativeHeight = 20;//CGImageGetHeight(icon.CGImage);

            //layer.contents = (id)icon.CGImage; 

           if (nativeWidth > biggestCustomIconWidth) {

               biggestCustomIconWidth = nativeWidth;

            }

         }else{ 

           layer= [[CPImageLayer alloc] initWithFrame:CGRectMake(0, 0, 1, 1)];

         }

          CGRect  startFrame = CGRectMake(0.0, 0.0,nativeWidth, nativeHeight);

           layer.frame= startFrame; 

          layer.backgroundColor = [UIColor clearColor].CGColor;

          CPAxisLabel *newLabel = [[CPAxisLabel alloc]initWithContentLayer:layer];

           newLabel.tickLocation = [tickLocation decimalValue];

             newLabel.offset = x.labelOffset +x.majorTickLength;            [customLabels addObject:newLabel];

           [newLabel release];

           [layer release];

      }

     y.axisLabels =  [NSSetsetWithArray:customLabels];

  }

CPImageLayer.h

#import "CPLayer.h" 

@interface CPImageLayer : CPLayer {

     UIImage*_image;

 }

-(id)initWithImage:(UIImage *)image; @end

CPImageLayer.m

#import "CPImageLayer.h" #import "CPLayer.h" 

@implementation CPImageLayer 

-(void)dealloc{

     [_imagerelease];

    [super dealloc];

}

-(id)initWithImage:(UIImage *)image{

     CGRect f =CGRectMake(0, 0, image.size.width, image.size.height);

     if (self =[super initWithFrame:f]) {

         _image = [imageretain];

     }

      return self; 

}

-(void)drawInContext:(CGContextRef)ctx{

    CGContextDrawImage(ctx, self.bounds, _image.CGImage); 

}

@end

 

 

Jul 22 '11 at 14:01

Lukasz



    
[3] UIScrollView UITableView 下提刷新代码
    来源: 互联网  发布时间: 2014-02-18
UIScrollView UITableView 上提刷新代码

http://www.cocoachina.com/bbs/job.php?action=download&aid=26207

 

自从 Tweetie 大获成功以后，下拉刷新几乎成了所有 App 的内容更新操作方式。如果你不想落入俗套，可以看看下面这段 CocoaChina 会员 “diyago” 分享的上提刷新代码。

    下面是.h文件的代码

//
//  EGORefreshTableHeaderView.h
//  Demo
//
//  Created by Devin Doty on 10/14/09October14.
//  Copyright 2009 enormego. All rights reserved.
//
//修改人：禚来强 iphone开发qq群：79190809 邮箱：zhuolaiqiang@gmail.com
//原文地址：http://blog.csdn.net/diyagoanyhacker/archive/2011/05/24/6441805.aspx


#import <UIKit/UIKit.h>
#import <QuartzCore/QuartzCore.h>

typedef enum{
    EGOOPullRefreshPulling = 0,
    EGOOPullRefreshNormal,
    EGOOPullRefreshLoading,    
} EGOPullRefreshState;

@protocol EGORefreshTableHeaderDelegate;
@interface EGORefreshTableHeaderView : UIView {
    
    id _delegate;
    EGOPullRefreshState _state;

    UILabel *_lastUpdatedLabel;
    UILabel *_statusLabel;
    CALayer *_arrowImage;
    UIActivityIndicatorView *_activityView;
    

}

@property(nonatomic,assign) id <EGORefreshTableHeaderDelegate> delegate;

- (void)refreshLastUpdatedDate;
- (void)egoRefreshScrollViewDidScroll:(UIScrollView *)scrollView;
- (void)egoRefreshScrollViewDidEndDragging:(UIScrollView *)scrollView;
- (void)egoRefreshScrollViewDataSourceDidFinishedLoading:(UIScrollView *)scrollView;

@end
@protocol EGORefreshTableHeaderDelegate
- (void)egoRefreshTableHeaderDidTriggerRefresh:(EGORefreshTableHeaderView*)view;
- (BOOL)egoRefreshTableHeaderDataSourceIsLoading:(EGORefreshTableHeaderView*)view;
@optional
- (NSDate*)egoRefreshTableHeaderDataSourceLastUpdated:(EGORefreshTableHeaderView*)view;
@end

    下面是.m文件的代码

//
//  EGORefreshTableHeaderView.m
//  Demo
//
//修改人：禚来强 iphone开发qq群：79190809 邮箱：zhuolaiqiang@gmail.com
//


#define  RefreshViewHight 65.0f

#import "EGORefreshTableHeaderView.h"


#define TEXT_COLOR     [UIColor colorWithRed:87.0/255.0 green:108.0/255.0 blue:137.0/255.0 alpha:1.0]
#define FLIP_ANIMATION_DURATION 0.18f


@interface EGORefreshTableHeaderView (Private)
- (void)setState:(EGOPullRefreshState)aState;
@end

@implementation EGORefreshTableHeaderView

@synthesize delegate=_delegate;


- (id)initWithFrame:(CGRect)frame {
    self = [super initWithFrame: frame];
    if (self) {
        
        self.autoresizingMask = UIViewAutoresizingFlexibleWidth;
        self.backgroundColor = [UIColor colorWithRed:226.0/255.0 green:231.0/255.0 blue:237.0/255.0 alpha:1.0];

        UILabel *label = [[UILabel alloc] initWithFrame:CGRectMake(0.0f, RefreshViewHight - 30.0f, self.frame.size.width, 20.0f)];
        label.autoresizingMask = UIViewAutoresizingFlexibleWidth;
        label.font = [UIFont systemFontOfSize:12.0f];
        label.textColor = TEXT_COLOR;
        label.shadowColor = [UIColor colorWithWhite:0.9f alpha:1.0f];
        label.shadowOffset = CGSizeMake(0.0f, 1.0f);
        label.backgroundColor = [UIColor clearColor];
        label.textAlignment = UITextAlignmentCenter;
        [self addSubview:label];
        _lastUpdatedLabel=label;
        [label release];
        
        label = [[UILabel alloc] initWithFrame:CGRectMake(0.0f, RefreshViewHight - 48.0f, self.frame.size.width, 20.0f)];
        label.autoresizingMask = UIViewAutoresizingFlexibleWidth;
        label.font = [UIFont boldSystemFontOfSize:13.0f];
        label.textColor = TEXT_COLOR;
        label.shadowColor = [UIColor colorWithWhite:0.9f alpha:1.0f];
        label.shadowOffset = CGSizeMake(0.0f, 1.0f);
        label.backgroundColor = [UIColor clearColor];
        label.textAlignment = UITextAlignmentCenter;
        [self addSubview:label];
        _statusLabel=label;
        [label release];
        
        CALayer *layer = [CALayer layer];
        layer.frame = CGRectMake(25.0f, RefreshViewHight - RefreshViewHight, 30.0f, 55.0f);
        layer.contentsGravity = kCAGravityResizeAspect;
        layer.contents = (id)[UIImage imageNamed:@"blueArrow.png"].CGImage;
        
#if __IPHONE_OS_VERSION_MAX_ALLOWED >= 40000
        if ([[UIScreen mainScreen] respondsToSelector:@selector(scale)]) {
            layer.contentsScale = [[UIScreen mainScreen] scale];
        }
#endif
        
        [[self layer] addSublayer:layer];
        _arrowImage=layer;
        
        UIActivityIndicatorView *view = [[UIActivityIndicatorView alloc] initWithActivityIndicatorStyle:UIActivityIndicatorViewStyleGray];
        view.frame = CGRectMake(25.0f, RefreshViewHight - 38.0f, 20.0f, 20.0f);
        [self addSubview:view];
        _activityView = view;
        [view release];
        
        
        [self setState:EGOOPullRefreshNormal];
        
    }
    
    return self;
    
}

//
//  EGORefreshTableHeaderView.h
//  Demo
//
//  Created by Devin Doty on 10/14/09October14.
//  Copyright 2009 enormego. All rights reserved.
//
//修改人：禚来强 iphone开发qq群：79190809 邮箱：zhuolaiqiang@gmail.com
//原文地址：http://blog.csdn.net/diyagoanyhacker/archive/2011/05/24/6441805.aspx
#pragma mark -
#pragma mark Setters

- (void)refreshLastUpdatedDate {
    
    if ([_delegate respondsToSelector:@selector(egoRefreshTableHeaderDataSourceLastUpdated:)]) {
        
        NSDate *date = [_delegate egoRefreshTableHeaderDataSourceLastUpdated:self];
        
        NSDateFormatter *formatter = [[NSDateFormatter alloc] init];
        [formatter setAMSymbol:@"上午"];
        [formatter setPMSymbol:@"下午"];
        [formatter setDateFormat:@"yyyy/MM/dd hh:mm:a"];
        _lastUpdatedLabel.text = [NSString stringWithFormat:@"最后更新: %@", [formatter stringFromDate:date]];
        
        [[NSUserDefaults standardUserDefaults] setObject:_lastUpdatedLabel.text forKey:@"EGORefreshTableView_LastRefresh"];
        [[NSUserDefaults standardUserDefaults] synchronize];
        [formatter release];
        
    } else {
        
        _lastUpdatedLabel.text = nil;
        
    }

}

- (void)setState:(EGOPullRefreshState)aState{
    
    switch (aState) {
        case EGOOPullRefreshPulling:
            
            _statusLabel.text = NSLocalizedString(@"松开即可更新...", @"松开即可更新...");
            [CATransaction begin];
            [CATransaction setAnimationDuration:FLIP_ANIMATION_DURATION];
            _arrowImage.transform = CATransform3DMakeRotation((M_PI / 180.0) * 180.0f, 0.0f, 0.0f, 1.0f);
            [CATransaction commit];
            
            break;
        case EGOOPullRefreshNormal:
            
            if (_state == EGOOPullRefreshPulling) {
                [CATransaction begin];
                [CATransaction setAnimationDuration:FLIP_ANIMATION_DURATION];
                _arrowImage.transform = CATransform3DIdentity;
                [CATransaction commit];
            }
            
            _statusLabel.text = NSLocalizedString(@"上拉即可更新...", @"上拉即可更新...");
            [_activityView stopAnimating];
            [CATransaction begin];
            [CATransaction setValue:(id)kCFBooleanTrue forKey:kCATransactionDisableActions];
            _arrowImage.hidden = NO;
            _arrowImage.transform = CATransform3DIdentity;
            [CATransaction commit];
            
            [self refreshLastUpdatedDate];
            
            break;
        case EGOOPullRefreshLoading:
            
            _statusLabel.text = NSLocalizedString(@"加载中...", @"加载中...");
            [_activityView startAnimating];
            [CATransaction begin];
            [CATransaction setValue:(id)kCFBooleanTrue forKey:kCATransactionDisableActions];
            _arrowImage.hidden = YES;
            [CATransaction commit];
            
            break;
        default:
            break;
    }
    
    _state = aState;
}


#pragma mark -
#pragma mark ScrollView Methods

//手指屏幕上不断拖动调用此方法
- (void)egoRefreshScrollViewDidScroll:(UIScrollView *)scrollView {    
    
    if (_state == EGOOPullRefreshLoading) {
        
        CGFloat offset = MAX(scrollView.contentOffset.y * -1, 0);
        offset = MIN(offset, 60);
        scrollView.contentInset = UIEdgeInsetsMake(0.0, 0.0f, RefreshViewHight, 0.0f);
        
    } else if (scrollView.isDragging) {
        
        BOOL _loading = NO;
        if ([_delegate respondsToSelector:@selector(egoRefreshTableHeaderDataSourceIsLoading:)]) {
            _loading = [_delegate egoRefreshTableHeaderDataSourceIsLoading:self];
        }
        
        if (_state == EGOOPullRefreshPulling && scrollView.contentOffset.y + (scrollView.frame.size.height) < scrollView.contentSize.height + RefreshViewHight && scrollView.contentOffset.y > 0.0f && !_loading) {
            [self setState:EGOOPullRefreshNormal];
        } else if (_state == EGOOPullRefreshNormal && scrollView.contentOffset.y + (scrollView.frame.size.height) > scrollView.contentSize.height + RefreshViewHight  && !_loading) {
            [self setState:EGOOPullRefreshPulling];
        }
        
        if (scrollView.contentInset.bottom != 0) {
            scrollView.contentInset = UIEdgeInsetsZero;
        }
        
    }
    
}

//当用户停止拖动，并且手指从屏幕中拿开的的时候调用此方法
- (void)egoRefreshScrollViewDidEndDragging:(UIScrollView *)scrollView {
    
    BOOL _loading = NO;
    if ([_delegate respondsToSelector:@selector(egoRefreshTableHeaderDataSourceIsLoading:)]) {
        _loading = [_delegate egoRefreshTableHeaderDataSourceIsLoading:self];
    }
    
    if (scrollView.contentOffset.y + (scrollView.frame.size.height) > scrollView.contentSize.height + RefreshViewHight && !_loading) {
        
        if ([_delegate respondsToSelector:@selector(egoRefreshTableHeaderDidTriggerRefresh:)]) {
            [_delegate egoRefreshTableHeaderDidTriggerRefresh:self];
        }
        
        [self setState:EGOOPullRefreshLoading];
        [UIView beginAnimations:nil context:NULL];
        [UIView setAnimationDuration:0.2];
        scrollView.contentInset = UIEdgeInsetsMake(0.0f, 0.0f, RefreshViewHight, 0.0f);
        [UIView commitAnimations];
        
    }
    
}

//当开发者页面页面刷新完毕调用此方法，[delegate egoRefreshScrollViewDataSourceDidFinishedLoading: scrollView];
- (void)egoRefreshScrollViewDataSourceDidFinishedLoading:(UIScrollView *)scrollView {    
    
    [UIView beginAnimations:nil context:NULL];
    [UIView setAnimationDuration:.3];
    [scrollView setContentInset:UIEdgeInsetsMake(0.0f, 0.0f, 0.0f, 0.0f)];
    [UIView commitAnimations];
    
    [self setState:EGOOPullRefreshNormal];

}


#pragma mark -
#pragma mark Dealloc

- (void)dealloc {
    
    _delegate=nil;
    _activityView = nil;
    _statusLabel = nil;
    _arrowImage = nil;
    _lastUpdatedLabel = nil;
    [super dealloc];
}


@end

    下面是调用类的代码

//
//  RootViewController.m
//  TableViewPull
//
//  Created by Devin Doty on 10/16/09October16.
//  Copyright enormego 2009. All rights reserved.
//
//修改：禚来强 email：zhuolaiqiang@gmail.com

#import "RootViewController.h"

@implementation RootViewController

- (void)viewDidLoad {
    [super viewDidLoad];
    
    [self.tableView reloadData];
    
    //self.tableView.contentInset = UIEdgeInsetsMake(200, 0, 320, 480);
    
    if (_refreshHeaderView == nil) {
        
        EGORefreshTableHeaderView *view = [[EGORefreshTableHeaderView alloc] initWithFrame: CGRectMake(0.0f, self.tableView.contentSize.height, 320, 650)];
        NSLog(@"%@", NSStringFromCGRect( view.frame ));
        view.delegate = self;
        [self.tableView addSubview:view];
        _refreshHeaderView = view;
        [view release];
        
    }
    
    //  update the last update date
    [_refreshHeaderView refreshLastUpdatedDate];

    
}

- (BOOL)shouldAutorotateToInterfaceOrientation:(UIInterfaceOrientation)interfaceOrientation {
    return YES;
}


#pragma mark -
#pragma mark UITableViewDataSource

- (NSInteger)numberOfSectionsInTableView:(UITableView *)tableView {
    return 10;
}

- (NSInteger)tableView:(UITableView *)tableView numberOfRowsInSection:(NSInteger)section {
    return 4;
}

- (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath {
    
    static NSString *CellIdentifier = @"Cell";
    
    UITableViewCell *cell = [tableView dequeueReusableCellWithIdentifier:CellIdentifier];
    if (cell == nil) {
        cell = [[[UITableViewCell alloc] initWithStyle:UITableViewCellStyleDefault reuseIdentifier:CellIdentifier] autorelease];
    }
    
    // Configure the cell.

    return cell;
}

- (NSString *)tableView:(UITableView *)tableView titleForHeaderInSection:(NSInteger)section{
    
    return [NSString stringWithFormat:@"Section %i", section];
    
}


#pragma mark -
#pragma mark Data Source Loading / Reloading Methods

- (void)reloadTableViewDataSource{
    
    //  should be calling your tableviews data source model to reload
    //  put here just for demo
    _reloading = YES;
    
}

- (void)doneLoadingTableViewData{
    
    //  model should call this when its done loading
    _reloading = NO;
    [_refreshHeaderView egoRefreshScrollViewDataSourceDidFinishedLoading:self.tableView];
    
}


#pragma mark -
#pragma mark UIScrollViewDelegate Methods

- (void)scrollViewDidScroll:(UIScrollView *)scrollView{    
    
    [_refreshHeaderView egoRefreshScrollViewDidScroll:scrollView];
        
}

- (void)scrollViewDidEndDragging:(UIScrollView *)scrollView willDecelerate:(BOOL)decelerate{
    
    [_refreshHeaderView egoRefreshScrollViewDidEndDragging:scrollView];
    
}


#pragma mark -
#pragma mark EGORefreshTableHeaderDelegate Methods

- (void)egoRefreshTableHeaderDidTriggerRefresh:(EGORefreshTableHeaderView*)view{
    
    [self reloadTableViewDataSource];
    [self performSelector:@selector(doneLoadingTableViewData) withObject:nil afterDelay:4.0];
    
}

- (BOOL)egoRefreshTableHeaderDataSourceIsLoading:(EGORefreshTableHeaderView*)view{
    
    return _reloading; // should return if data source model is reloading
    
}

- (NSDate*)egoRefreshTableHeaderDataSourceLastUpdated:(EGORefreshTableHeaderView*)view{
    
    return [NSDate date]; // should return date data source was last changed
    
}


#pragma mark -
#pragma mark Memory Management

- (void)didReceiveMemoryWarning {
    [super didReceiveMemoryWarning];
}

- (void)viewDidUnload {
    _refreshHeaderView=nil;
}

- (void)dealloc {
    
    _refreshHeaderView = nil;
    [super dealloc];
}

@end

    附件下载: 上拉刷新.zip (97 K)


    
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