android tablet basics

Suppose you have implemented a compute percent function that requires testing, code:public class Progressservice {public Integer Getcurrentprogerss (double current, double max) { Integer i= (int) (( Current/max); return i; }}To unit test a specified feature, the following steps are detailed:A test classWriting a test class to perform our function, this class needs to inherit Androidtestcase.Import Android.test.androidtestcase;import Android.util.log;import Com.example.service

store a variety of data types, in addition to commonly used types, also supports Stringset storage When the data is written, remember to call Editor.commit () 3. For sharedpreferences data read, the following example shows how to read an int type from the Preferences object, named indexof dataSharedPreferences preferences= getActivity().getPreferences(Context.MODE_PRIVATE);int0;intindex = preferences.getInt("index", defaultIndex); The first parameter of the Preferences.getint

; } }; Copy Code Summary: 1. Click on the execution flow of an item on the screen there are two cases, one is short time, one time is slightly longerTime is short: ondown--– "onsingletapup--–" onsingletapconfirmedA little longer: ondown--– "onshowpress--" onsingletapup--– "onsingletapconfirmed2. Long Press Eventsondown--– "onshowpress--" onlongpress3. Toss: After the finger touches the screen, slightly swipe and release immediatelyondown-– "onscroll--" onscroll--"onscroll

void Savemybitmap (String bitname,bitmap mbitmap) throws IOException { File F = new file ("/sdcard/note/" + bitname); if (!f.exists ()) F.mkdirs (); //If you do not have this folder, you will be reported file not found error f=New File ("/sdcard/note/" +bitname+". png"); F.createnewfile (); try { FileOutputStream out = new FileOutputStream (f); Mbitmap.compress (Bitmap.CompressFormat.PNG, N, out); Out.flush (); Out.close (); } catch (FileNotFoundException e) { LOG.I

. The corresponding code in the Secondactivity page is as follows: Intent intent = new Intent(); intent.putExtra("num""123"); finish(); setResult(RESULT_OK, intent); RESULT_OK is the result code, and when the returned intent parameter is received, the callback method Onactivityresult provides the result code to correctly identify the result and determine how to handle it. 3. After returning to the first page, the corresponding code is as follows:@OverrideprotectedvoidonActivity

Requirement Description: Android developmentContent: The first part of the Big Friends VR integrated machine solutionPart two Samsung VR integrated machine solutionFrom: The time of the poemOriginal: http://www.ithome.com/html/it/235838.htmThe first part of the Big Friends VR integrated machineAs one of the leading virtual reality enterprises in China, the company has pioneered the world's first mass-produced VR machine, and in just two years, the ind

Before Lao Zhang taught C when said: The more learning, summed up the less, the better.The beginning of the time can not understand, now finally slowly realized.Prepare to slowly summarize the commonly used Android Foundation, is to relive the good memories of it. Personal blog record personal experience, hope to be happy and can help others.Let's start with the layout:Summarize relative layouts: 1. Parent control's relationship to child controls (ALI

prepare 5 sets of layouts according to the size of the physical size, layout (put some common layout XML files, such as the top and bottom layouts in the interface, will not change with the screen size, like the title bar of the WinDOS window), Layout-small ( Screen size less than 3 inches in layout), layout-normal (screen size less than 4.5 inches or so), Layout-large (4 inches-7 inches), Layout-xlarge (7-10 inches)2) Picture Resources5 sets of picture resources need to be prepared according t

is visible Set callback for Surfaceholder, similar to listening, to know the status of Surfaceviewsh.addCallback(new Callback() { // SurfaceView销毁时调用 @Override public void surfaceDestroyed(SurfaceHolder holder) { } // SurfaceView创建时调用 @Override public void surfaceCreated(SurfaceHolder holder) { } @Override public void surfaceChanged(SurfaceHolder holder, int format, int width, int height) { }}); Once the Surfaceview is not visible, it will be dest

Turn from: Use of the android dialog boxA dialog box is usually a small window that is displayed before the current activity. The following activity loses focus and the dialog box above receives the user's interaction information. dialog boxes are often used as hints and as a short-stay interface directly related to the program's running process.AlertdialogDescription: One can handle 0, one, 2, or 3 buttons, and/or a set of items that can be selected,

Surfaceholder, similar to listening, to know the status of Surfaceviewsh.addCallback(new Callback() { //SurfaceView销毁时调用 @Override public void surfaceDestroyed(SurfaceHolder holder) { // TODO Auto-generated method stub } //SurfaceView创建时调用 @Override public void surfaceCreated(SurfaceHolder holder) { // TODO Auto-generated method stub } @Override public void surfaceChanged(SurfaceHolder holder, int format, int width, int height) { //

resources for custom attributesThe resource file is placed in the Res/values directory with the following contents:　4. Define constructors in the Mradiobutton class, initialize properties Public Mradiobutton (Context context) { super (context); } Public Mradiobutton (context context, AttributeSet attrs, int defstyle) { Super (context, attrs, Defstyle); } Public Mradiobutton (context context, AttributeSet Attrs) { Super (context, attrs); Load a

Effects:found that the print function was added, and was not confused.C. Proguard will output the following files each time it is built: dump.txt Describes the internal structure of all class files in the APK. mapping.txt Provides conversions between raw and obfuscated classes, methods, and field names. seeds.txt Lists classes and members that are not confused. usage.txt lists the co

Socket Programming Basics: Primary server-side programming and client programming. Server-side programming steps: 1: Create server-side sockets and bind to a port (0-1023 is System reserved, preferably about 1024) 2: Socket set listening mode waiting for connection request 3: Communication After accepting the connection request 4: Return, wait to win a connection request Client Programming Steps: 1: Create a client socket (specify server-side

This example describes the basics of Android's WiFi development. Share to everyone for your reference. Specifically as follows: Android provides the Wifimanager class, which enables WiFi-related operations. Pass You can get an instance of the class. 1. Get WiFi on (as long as WiFi on the phone is turned on and is not connected to a WiFi connection): Boolean isOpen = wifimanager.iswi

activity's OnPause method. In general, an application needs to rewrite at least three functions to complete your application logic.This article is original, prohibit reprint!If you are interested in programming, want to know more programming knowledge, solve programming problems, want to learn a certain kind of development knowledge, we have Java master, c++/c Master, Windows/linux Master, Android/ios Master, Please pay attention to my public nu

C language basics Lesson 3 Use of ADB (Android Debug Bridge) Since I have published a Linux blog before, I will not post a blog on Linux basic commands separately. In this tutorial, I will use adb to connect to a mobile phone to review basic Linux commands. You are also familiar with the underlying operations of mobile phones. you can install software, uninstall software, and transmit data from PC

What is JNI and how to use itJni--java Native Interface, which is a feature of the Java platform (not specific to the Android system). In fact, the main definition of a number of JNI functions, so that developers can call these functions to implement Java code C + + code, the code can also call Java code, C + +, so you can play the characteristics of each language. So how to use JNI, in general, we will be the first to compile the C + + code to the co

project introducesBuild.gradle (Project): code-managed WarehouseBuild.gradle (Module):Second, shortcut keysNote: ctrl+/Hint: ctrl+alt+ spaceJump into method or class: Ctrl + LEFT mouse buttonFormat code: CTRL+ALT+LRun the app again (the emulator opens) Ctrl+f5Third, log catImportandroid.support.v7.app.AppCompatActivity;ImportAndroid.os.Bundle;ImportAndroid.util.Log;// Public classMainactivityextendsappcompatactivity {//OnCreate methods that must be executed after an activity is created@Override

Tags: server fetch fill occurs based on the default cross-process communication compilation implementationThe binder mechanism of AIDL on the application layer for beginners to knowFirst you have to understand several concepts:Ipc:inter-process communication, inter-process communication or cross-process communication. It is simple to understand that an application can have multiple processes, but the need for data exchange requires IPC, or data exchange between two applications.Binder:binder is