Mobile Develop

Pixel Density proportional relationship---It usually takes five different sizes of icons to fit different screen resolutions, and the system can automatically create low-resolution icons based on the resolution's icon. Size | DPI | Multiples |--- |

Android Asynctask IntroductionComparison of Asynctask and handler1) Asynctask implementation of the principle, and the advantages and disadvantages of the applicationAsynctask, a lightweight asynchronous class provided by Android, can directly

#在蓝懿学习iOS的日子 # So we're going to review it today, the way we learned this time:One, the conversion of numbers and texts I structure:1. Convert the numbers into text:L.text = [@ (X) stringvalue;2. W converts the text into characters:int a =

Similarities and differences between Web front-end development and iOS terminal development IOS8 Multi-language alternative rules use Dispatch_sync deadlocks with cautionThat is, this code is added in the main thread (viewdidload), and the main

Today in the release, found a very wonderful problem, in the ListView sliding process, the individual item has a black background, when viewing the XML layout file has been set: Android:cachecolorhint= "#00000000", but still does not work, I checked

animating transitions using the UIView animation function--dual View+ (void) Transitionfromview: (UIView *) Fromview Toview: (UIView *) Toview Duration: (nstimeinterval) Duration options :(uiviewanimationoptions) options completion: (void (^) (BOOL

- (void) setrightbarbuttonitem{//Create Done ButtonUibarbuttonitem *donebutton = [[Uibarbuttonitem alloc]initwithtitle:[nsstring stringWithFormat:@"OK (%lu/%lu)", (unsignedLong) Self.selectedAssetURLs.count, (unsignedLong)

Shape is used for setting shapes, can be used in selector,layout, etc., with 6 sub-labels.Sizes (size)Gradient (gradient)Fill (solid)Rounded corners (corners)Stroke (stroke)Interval (padding)Res/drawable/shape_self.xmlXML version= "1.0" encoding=

1. Fontsfont-family: "Helvetica Neue", Helvetica, Stheiti, Sans-serif;font-family: ' Helvetica Neue ', helvetica,arial, ' Microsoft Yahei ', Sans-seriffont-family: ' Helvetica Neue ', Helvetica, Arial, ' Lantinghei SC ', ' Hiragino Sans GB ',

Statically cached operations This previously written page static has a similar idea, nothing more than to get the data, write data, read the data, a few actions. The example writes a method, through to the parameter judgment, can the static cache

Nsdictionary to jsonstring [self datatojsonstring:dic]-(nsstring*) dictojsonstring: (ID) object{ NSString * jsonstring = nil; Nserror *error; NSData *jsondata = [nsjsonserialization datawithjsonobject:object

Initialize TextField and set location and size  uitextfield *text = [[Uitextfield Alloc]initwithframe:cgrectmake]];   // The border style is set only if the border style is set    text.borderstyle = uitextborderstyleroundedrect;  typedef enum {      

File path = Environment.getdatadirectory ();//Cell phone built-in space1. Get the path of the SD cardFile path = Environment.getexternalstoragedirectory ();2. Get sectorStatFs stat = new StatFs (Path.getpath ());3. Get a Sector sizeLong blockSize =

Progress bar:LinearLayoutxmlns:android= "Http://schemas.android.com/apk/res/android"Android:layout_width= "Match_parent"Android:layout_height= "Match_parent"android:orientation= "vertical"> ProgressBarDefault progress bar Android:id=

Long Press Whether the Edit menu appears (Cut Copy Paste)-(BOOL) CollectionView: (Uicollectionview *) CollectionView Shouldshowmenuforitematindexpath: (NSIndexPath *) Indexpath{return YES;}-(BOOL) CollectionView: (Uicollectionview *) CollectionView

Recently, because of the system upgrade caused the Xcode6. Series version of the bug, so began to use Xcode7. In the use of a sudden thought CollectionView in the iOS9 released a can move the cell's new features , try to implement it, but the API

The source code is as follows, only one class file   DBHelper.h////  Created by Jason_Msbaby on 15/10/15.//   copyright ? 2015   Zhang Jie . all rights reserved.///** *   Simple encapsulation of the use of SQLite   not added to transactions and

1 添加一个提示框效果导入第三方MBProgressHUD #import "mbprogresshud+mj.h" 123456789101112131415161718192021222324 /** * 

1, file Storage.2,sharedpreferences Storage haredPrefere NCEs is the way to store data using Key-value Pairs. That is Say that when you save a piece of data, you need to provide a corresponding key to this data, so that when reading data can be

1234567891011121314151617181920212223242526272829303132333435363738394041424344454647484950 /** *  清理缓存第二种方法 * *  @param sender  */- (void)clearCache:(id)sender{    //彻底清除缓存第一种方法    UIButton * button = sender;    [button setTitle:@"清理完毕"