Today, we have summarized the common hidden code on Android phones and provided a reference to our friends who love Android phones.
Note that the following code should be used with caution, because some code may cause the mobile phone to lose its original functions. In addition, because the ROM author will modify some rom content, some code may not work on a mobi
effect, of course, more than 60fps is not necessary.The performance goal of the development app is to keep 60fps (some less will not affect the user experience), which means that each frame you only have 16ms=1000/60 time to handle all the tasks (this time can be used to compare with TraceView time, not too much for example greater than 32ms, Otherwise, it should be optimized).6) Android, UI and the GPUUnd
Anyone who has used the Google Play store app or the app is aware that its actionbar can be hidden or displayed as the ListView slides. The effect looks very good, for this, I clumsily imitated a similar effect, do not know there is no better way.First on the main layout activity_main:Note that the toolbar here, we will use this toolbar to replace the original Ac
into a jar package.How do I compile a project into a jar package? Engineering-->properties-->android-->is liberary to tick. It is also important to note that DateTimePicker needs to refer to Android-support-vx.jar, which must refer to the higher version, such as version 13, which is explained later.With the jar package, we reference the jar package to Deskclock, and there is a lot less error.2.2
will remind you to set up the JDK first, and follow the instructions to find the JDK directory.
After you fill out the project name, select the USB Device and then complete the project build, and the IDE automatically generates the files and directories needed for the basic project.
Second, code writing
When you're ready, you can finally start writing our Hello Android
App does not display iconsThis address: www.2cto.comIn the Androidmanifest registration of the activated activity, add the implicitly-initiated data: Several solutions for deleting app icons:1, androidmanifest.xml file in the entrance activity of the intent-filter removedor change launcher to default2, add the following code in the programShow Picture:Packagemanager p = Getpackagemanager ();
Install Apps (APP) does not display iconsThis address: Http://blog.csdn.net/caroline_wendyIn the Androidmanifest registration of the activated activity, add the implicitly-initiated data: Reference: http://blog.csdn.net/ydt_lwj/article/details/9419239/Several solutions for deleting app icons:1, androidmanifest.xml file in the entrance activity of the intent-filter removedor change launcher to default
Differences between Android TV app and mobile app: androidappOne of the company's projects is for android TV. Thanks to the daily report, summary: android TV app presents the difference between the ui and mobile app.The main diffe
One app in Android launches another application generally there are 2 different cases,The package name of the application being launched is known and unknown in two cases:1 The package name of the app being launched is known: /** launches another applied code, where the app's package named PackageName, the application's entry is packagename.mainactivity,
/Directory for other varous XML files that contain a collection of resources, such as string and color definitions.When you build and run the default Android app, the default Activity class starts and loads a layout file that says "Hello World. "The result is nothing exciting, but it's important that you understand how to run your
in the values/directory describe multiple resources. For a file in this directory, each child of the element defines a single resource. For example, the A element creates an R.string resource and a element creates an R.color resource.Because each resource are defined with their own XML element, you can name the file whatever you want and place different res Ource types in one file. However, for clarity, your might want to place unique resource types in different
.
Second, code writing
When you're ready, you can finally start writing our Hello Android, and before we start writing the code, we'll look at a few files:
Res/layout/main.xml app main form layout file, what your application looks like in this definition, there are design and text two modes
Res/values/strings.xml can be understood as a i18n file, which is
list;
Developers use the Action_ignore_battery_optimization_settings intent and Arequest_ignore_battery_optimizations permission settings provided by Google to ignore (recommended);
Use GCM provided by Google;
Bypass doze mode with so.
I use MIUI 7.5 (Android 6.0.1) test process found that I maintain a long connection into the standby mode, the network is broken (mobile phone other app net
: @ com.android.dx.command.dexer.Main.main (main.java:199) at Com.android.dx.command.Main.main (main.java:103)That's right. The number of Dex file methods in your app exceeds the maximum limit of 65536, so simply put, the app is bursting.So let's see why this error is caused:In the Android system. All the code for an App
Reading and Writing Android files and reading and writing Android files
Android uses IO streams to read and write files in the same way as JavaSE. In addition, Android uses the JavaSE I
optionsIs hidden by default. To make it available, goSettings> about phoneAnd tapBuild numberSeven times. Return to the previous screen to findDeveloper options.
To run the app from eclipse, open one of your project's files and click Run from the toolbar. Eclipse INSTALLThe app on your connected device and starts
App widgets are also a UI component that can embed a small program (program piece) into the desktop. Compared with common widgets (such as TextView and WebView), the following differences exist:
An App Widget is a live UI component that automatically updates its content;Widgets cannot automatically update their own content and can only passively wait for user calls;In applications, because of the automatic
configuration information as the user uses it, such as the EQ setting at the last play, the volume setting, the cookies information on the Internet, etc., which can be maintained by Sharedpreferences. Data persisted through Sharedpreferences as an XML file, located in the application's private folder2.4.2 FilesIn Android, you can create a file that holds data in the device's own storage device or from a storage device that is connected outside it. By
Android's automated testing has many frameworks, where UI Automator is the official black-box UI-related automated test tool (GitHub homepage: Case used in Java, and today we practiced the sample program in the official document, There are still some small problems to be summed up.Environment Preparation:1.JDK (yes, you are not mistaken, basic Android development environment necessary), as well as the corresponding environment variable configuration,
Analysis of App engineering files
For information on how to create one of the simplest Android apps please refer to the link:
Android Learning Notes (i) Environmental installation and the first Hello World http://www.jb51.net/article/52593.htm
The completed engineering files
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