QtAndroid (4): JNI calls Android system functions (1)
In the previous sections, we have explained the basic usage of the QtAndroid namespace. This time, we will use the methods and class libraries we mentioned earlier to demonstrate some simple small examples. In my book Qt on Android core programming, I mainly call some Andr
picture, and do not have to manually recycle, but also to ensure that no exception to do? For example a banner page, this time, I recommend not to use the Setimageresource (directly in the XML SRC reference is also called this method)Setimagedrawable these two methods.should use bitmap=. Bitmapfactory.decoderesource and Setimagebitmap combined, here is not reused, and the system will be based on the frequency screen density to scale, to avoid the waste of memory, at the same time you can also m
Android reinforcement series-4. Learn to crack before reinforcement, and debug apk and androidapk without source code
[All Rights Reserved. For more information, see the source .]
The key java code of the project is to set TV to a string read from jni. The cracked content here is to dynamically debug and modify the character content that is finally displayed in TV from apk.
1. Tool Introduction
Apktool fo
[ALearning] Chapter 4 Layout of the Android Layout component (1), alearningandroid
In this chapter, we will learn about the Android layout components. In the previous chapter, we also initially used the LinearLayout layout. Next we will learn more about the layout file, in addition, we will have a deep understanding in the use of the case.
The
to Apply trustzone technology to DRM.
Figure 4 Use trustzone to encrypt DRM
Now, we have discussedThe five challenges that android brings into the Internet digital family: Let's take a look at some comparisons between Android TV and googletv.
In fact,Arm partners can deploy Smart TVs with Android as the bas
Compile the JNI method for the hardware abstraction layer (HAL) module of Android in Ubuntu to provide the Java access hardware service interface (Lao Luo study note 4), androidjni
In the last two articles, we introduced how to write drivers for Android hardware, including how to implement kernel drivers in Linux kernel space and Hardware Abstraction Layer interf
Android solves the problem of massive image downloads: Soft references must be understood as 4 points,
1. Strong, soft, weak, and virtual references of ObjectsIn order to control the lifecycle of objects more flexibly, you need to know the level 4 of object reference, from high to low: strong reference, soft reference, weak reference, and virtual reference.
Note:
"Android: layout_height = "wrap_content"Android: text = "Here are the details for the notification..."/>4. icationicationview. java code.Package net. learn2develop. configurications;Import android. app. Activity;Import android. app. icationicationmanager;Import
Content of this sectionUnderstanding ActivityActivity LifecycleInstance: Observe activity status changes caused by screen flip
Click here to download: lesson4.zip
1. Understand Activity
Activity is one of the four main components of the android program.Activity is the presentation layer of the android program. Each display screen of the program is an activity.Stu
Android Network Programming Using PHP to operate MySql to insert data (4), androidmysql
Because I recently updated my project, I want to summarize some simple methods of interacting with the network that I used in the project, so there will be more blog posts on network programming for Android recently. I will try my best to share it with you in the simplest way
Original article: http://blog.sina.com.cn/s/blog_4a0a39c30100b1n1.html
SDL (Simple DirectMediaLayer) is an open source multi-platform multimedia development library written in C language. SDL provides a variety of image, sound, keyboard, and Other implementations, with high configuration and portability. developers can develop cross-platform (Linux, windows, Mac)OS X, Symbian, and WidnowsEmbedded systems such as mobiel, of course, include the platform to be transplanted today:
to know the length and width of the desired image in advance. For example, I want to cut an image of 400*400 (unit: px. Use this as a benchmark to calculate the length and width of the Rect displayed on the screen, and then draw the MaskView. Select the mode as needed. This article uses the first mode as an example. The code below:
Package on the basis of the miscellaneous documents. First, encapsulate a MaskView to draw the bright effect in the dark, or you can add a scroll bar. This is not a
English environment will show "OK" and "Cancel".4) Use the style of the systemSuppose there is a textview in the layout file that displays the title of the window, using a medium-sized font. You can use the following code snippet to define the style of the TextView.
Android:id= "@+id/title"Android:layout_width= "Wrap_content"android:layout_height= "Wrap_content"Android:textappearance= "? Android:attr/textappearancemedium"/>
correspond to one Linux thread, so virtual machines can rely more on the operating system's thread scheduling and management mechanisms. Different applications run in different process spaces, and applications from different sources run with different Linux users to maximize the security and standalone operation of the application.4,linux Core LayerAndroid's core system services are based on the Linux2.6 kernel, such as security, memory management, p
(Byteorder.little_endian).Putshort (data). Array ();} private static short Bytearraytoshort (byte[] b) {return bytebuffer.wrap (b). Order (Byteorder.little_endian). Getshort ();} private static int bytearraytoint (byte[] b) {return bytebuffer.wrap (b). Order (Byteorder.little_endian). GetInt ();About WAV file read and write Class I have helped everyone "encapsulation" well, and combined with the previous several articles given the audio collection and playback of the code, completed a Audiodemo
Android scroroller (4)-implement the layout of rebound after pulling, androidscroroller
MainActivity is as follows:
Package cc. testscroller2; import android. OS. bundle; import android. app. activity;/*** Demo Description: * The layout that can be pulled and then rebounded. * similar to the pull-down refresh. ** refe
. editText; public class MainActivity extends Activity {// defines the variable private Button btnDail; private EditText phoneNumber; @ Override protected void onCreate (Bundle savedInstanceState) {super. onCreate (savedInstanceState); setContentView (R. layout. activity_main); // use findViewById to obtain the buttons and text box objects and forcibly convert them to btnDail = (Button) findViewById (R. id. btn_dail); // Add the listener event btnDail for the button. setOnClickListener (new MyLi
[Android Development] example 4-guess the box in which the gem is stored, android4-A mini game that implements "Guess which box the gem is placed in": There are three boxes in the main interface. clicking any box will open the box and show whether there are any gems in it, in addition, the box that has not been clicked is set to semi-transparent. The box that has been clicked is displayed normally, and the
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