1. Build an Android Development Environment
1) download JDK
2) download Eclipse
3) download the Android SDK
4) Start Eclipse and install ADT
2. Download and install Android NDK
3. Download and install cygwin
Since make and gcc must be used to compile the NDK code, you must first build a linux environment. cygwin is a unix simulation environment running on win
(path, paint), either filled or stroked * (based on the paint style), or can be used to cut or draw text in the path.
*///Draw rounded corner rectangle P.setstyle (Paint.Style.FILL);//Full P.setcolor (Color.ltgray);
P.setantialias (TRUE);//Set the sawtooth effect of the brush canvas.drawtext ("Draw Rounded Rectangle:", ten, p);
RECTF oval3 = new RECTF (80, 260, 200, 300);//Set up a novel rec
Monitoring-based event handling mechanism preface:We develop apps that need to interact with the user----that responds to the user's actions.This involves the Android event-handling mechanism;Android gives us two sets of powerful processing mechanisms:① event handling mechanism based on monitoring② Callback-
Cursor = Database.rawquery (
"Select 中文版 as _id from T_words where Chinese like?",
new string[]{s.tostring () + "%"});
Dictionaryadapter dictionaryadapter = new Dictionaryadapter (This,cursor, true);
Actvword is the variable
actvword.setadapter (dictionaryadapter) of the Autocompletetextview type defined in the main class;
As you can see from the code above, the alias for the Chinese field name in the query SQL statement is "_id".
4. In the Dictionaryadapter class, you nee
(true)Turn on the scroll switch, from visible to invisible,Setscrolled (false)
Turn off the switch
2. You can callSetperiod (long period)AndSetspeed (long speed)Control the scroll speed
3. Because it isScrollviewImplemented. The content placed in the middle is the same as that in scrollview. You can not only set text, but also addImageAnd other elements to implement a complex UI
4.Text MixingAt present, I
getcontentresolver () to obtain a contentresolver,Getcontentresolver (). Query () returns a cursor object with the same parameters as managedquery.However, securityexception is reported when you use the contentresolver object to update, delete, and insert a data record. It seems that you do not have the permission. Add the permission to manifest. xml:
Then delete the text message:This. getcontentresolver (). Delete (URI. parse ("content: // SMS"), "_
the device configuration is as follows:Locale = en-GB Screen orientation = port Screen pixel density = hdpi Touchscreen type = notouch Primary text input method = 12key
By comparing the device configurations and the drawable folders modified by these available delimiters, the Android device finally selects the images from the drawable-en-port folder.
The system determines why the image in the folder should
:
Locale = EN-GB
Screen orientation = port
Screen pixel density = hdpi
Touchscreen type = Notouch
Primary Text Input method = 12key
By comparing these drawable folders with the device configuration and the above available qualifiers, the final Android device selects the pictures from the Drawable-en-port folder.The system is based on
SD card:
The equivalent of a computer's mobile hard drive
External storage space External storage
SD card StatusRemove: No plug-in SD card UNMOUNT:SD card is plugged in, but no Mount CHECKING:SD card is being traversed by the system MOUNTED:SDcard can read and write mounted read ONLY:SD card is available, but read onlyGet the remaining capacity of the SD card
Chunk size
Total number of blocks
Number of available chunks
Chunk Size * Total number of chu
Android component-based development (2)-RadioButton matrix for grid layout
**Preface
**In Android, we usually use RadioGroup to manage a set of RadioButton to achieve the mutex effect of single-choice buttons. However, in some requirements, the RadioButton matrix composed of N rows and N columns needs to be completed. However, our RadioGroup is a straight LinearL
Permission management in Android (based on Permission ProtectionLevel) and androidpermission
1. What is protectionlevel?
We often use permissions in AndroidManifest. If we want applications to send text messages, we should write as follows:
So where is the definition of this permission defined? As follows:
Frameworks/base/core/res/AndroidManifest. xml
This x
of servers will be very large. A few of the frameworks mentioned later in this article, with the help of the Java NIO feature, alleviate the pressure and resource consumption on the server, but after all, there is a connection and cannot be compared with the traditional HTTP no-connect server in performance.OtherOther: In the mobile phone, in fact, you can also have text messages, mail and other ways to carry out information push. These methods becau
The next blog plan is that some Android open source projects will be sent between the Android official technical document translator, and a few of the remaining Android technical documents are sent out, followed by the Android Open source project and the Gradle translation. Of course, other article notes will be sent o
, arc, parameter two is the starting angle (degrees) at the beginning of the arc,Parameter three sweep angle (degrees) begins to measure clockwise, parameter four is if this is true, including the Oval center arc, and close it if it is false it will be an arc, parameter five is the Paint object;Also understand a paint class:class overview The Paint class holds the style and color information about what to draw geometries, text and bitmaps.The Paint cl
Previous topic Android Development Network Request Communication Topic (i): Request communication based on HttpURLConnection we explained how to use HttpURLConnection to achieve basic text data transfer. Generally in the actual development we can be used to transfer XML or JSON-formatted data. Today we will explain another way of HTTP network request: HttpClient,
This article translated from: http://developer.android.com/guide/topics/text/spell-checker-framework.html
The Android platform provides a spell checker framework that allows you to execute and access spell checking in your application. This framework is one of the text service APIs provided by the Android platform.
To
As the graduate program needs to complete a mobile terminal-based scene character recognition system, although the graduation is still early, but for the sake of interest, the recent time to complete the system. The basic architecture is as follows:Client: Android application to capture the scene picture, roughly underline the area of interest text, through the s
The trend of network informatization, following the continuous progress of streaming media technology, wireless network technology and video compression technology, video surveillance technology has been widely used, together, monitoring planning and planning is also expanding. Everyone about the need for security assurance continues to improve, and then make the past to text-based content services should n
The content source of this page is from Internet, which doesn't represent Alibaba Cloud's opinion;
products and services mentioned on that page don't have any relationship with Alibaba Cloud. If the
content of the page makes you feel confusing, please write us an email, we will handle the problem
within 5 days after receiving your email.
If you find any instances of plagiarism from the community, please send an email to:
info-contact@alibabacloud.com
and provide relevant evidence. A staff member will contact you within 5 working days.