Mobile Develop

First, the problem description Before we used the head navigation in the Viewpager+fragment area, Google added a new actionbar after Android 3.0 to make it easy to implement the design of the head area of the screen such as Return key,

Dpi:dots-per-inch, the number of pixels per inch, that is, the greater the density, the more points are accommodated in each inch. This value is determined by the device itself and written to death.Calculation method: Get to the screen resolution:

metadata Meta-data is applied in the Manifest.xml file, primarily to provide configuration data for the parent component. A component can contain more than one meta-data;it can be included in ,,, in. its basic usage syntax is:similar to the form of

bitmap = Bitmap.createBitmap (Bitmap,0 , 70 , Bitmap.getwidth (), Bitmap.getheight ()/3 ) Matrix matrix = new Matrix () Matrix.postscale (2.0 F, 0.5 f) Bitmap = Bitmap.createbitmap (Bitmap,0 , Span class= "Hljs-number" >0 , Bitmap.getwidth

Do you know the "3-time handshake"? Suddenly remembered the wordWhat is a 3-time handshake? TCP three-time handshake/four wave details here is a detailed explanation of the 3-time handshakeThe 3-time handshake is to reliably transmit data, TCP (what

This section learns Diaolog. In life dialog includes: three styles (Single-selection dialog box, multi-Select dialog box, OK Cancel dialog box)Let's one analysis:To determine the Cancel dialog box:public void Click1 (View v) {

The first step:1 /**2 * Get all the activtiy3 * 4 * @return5 */6 Public StaticSparsearrayGetcompanypackagename () {7String packbackname = "com.tiancheng.business.activity.";8sparsearray array =NewSparsearray();9Array.put (2,

Import Android.content.context;import Android.graphics.matrix;import Android.graphics.rect;import Android.graphics.rectf;import Android.graphics.drawable.drawable;import Android.util.attributeset;import Android.view.gesturedetector;import

Using Ddmlib to achieve Android performance monitoring principle: CPUadb shell Dumpsys cpuinfo packagenameMemoryadb shell Dumpsys meminfo packagenameFlowCat/proc/uid_stat/uidxxx/tcp_rcvCat/proc/uid_stat/uidxxx/tcp_sndWhere the UID is obtained

There is also a way to exit the program, that is, the use of the open API, this method is more unreliable, because the use of the Open API is not available through the AppStore, and I in the 4.0 version of the experiment is not valid.You can only

When you select a picture from the gallery and then return to the data reception process, we may encounter a problem at this time. It's just that I'm gone. Returns the code. But why doesn't my picture path get it? This time may be different due to

When Android develops, it jumps from one activity to another, and can be used in a startactivityforresult way. Returns a result that updates the data based on the results.For example, the following code (adopted)One start activity@OptionsItem

When using nsmutabledictionary, it can cause a program to crash if it is improperly manipulated. Example code:NSString *result = @ "{\" username\ ": \" aaa\ ", \" phone\ ": \" 15666666666\ ", \" bankcount\ ": \" 98765432112345678\ "}"; NSData *data =

Since we are going to use Arrayadapter, let's look at the adapter relationship in the system first:In practice the use of high frequency is: Simpleadapter, Arrayadapter, BaseadapterBaseadapter: is an abstract class that implements a more versatile

Toast is an android as a hint is often needed, however sometimes a lot of toast pops upmake the whole program look not harmonious enough. The official offer is only two display times,Toast.length_long display time is 3.5 seconds, toast.length_short

All activity is managed by a collection class, enabling you to control activity at any time. Add activity to list using the Add Activity method, remove activity from list using the Remove activity method, using Finishprogram () Method removes all

First of all the use of the Project (flirt 1.0 version of Sugar) source, shared to everyone, novice do not spray. The UI is not learning, using the default theme style, and so on learning to play the UI is doing Updates. This time to do this get a

The iphone has a very fluid user touch interaction experience that detects a variety of gestures: click, swipe, zoom in, Zoom out, Rotate. In most cases, gesture objects such as ui*gesturerecognizer are used to correlate gesture events and gesture

Andriod system is a system based on event-driven behaviorAndirod four ways to add event driversThe first customization of an inner class implementation OnclicklistenerPrivate class Mylistenner implements onclicklistener{public void OnClick (View W) {

Data Binding Combat (i)Data binding Syntax parsing (ii.)Data Binding Advanced Usage (iii)well, After studying the data binding in the first three articles, we can see that there are a few of its strengths: 1. Use MVVM mode to make the whole