Property Animation in Android -- Android development art exploration notes
Animator was first introduced in Android 3.0. Compared with the previous Animation framework, Animator is more flexible and has more functions. It is officially recommended to use Animator instead of Animation. Before 3.0, you can use nineoldand
Android learning notes-App Initial Startup interface implementation, android-app
When many apps on android phones start, an image is displayed first. as the beginning of the app, the image is transient. This image usually uses the app icon as an advertisement.
For example:
Its implementation method is very simple.
[Android Notes] widgets and Android WidgetsWhat is a Widget? The App Widget is a desktop tool provided by android. It can be embedded into the desktop and can regularly update its own data.As shown in:
How to Create widgets?
The following components are required to create a Widget:
1 AppWidgetProviderInfo: This class
() { Android.applicationVariants.all {v- if (V.name.endswith (' Debug ')}) { String name = V.name.capitalize () dependsOn "Install$name"}} }The DependsOn method shows that this is part of the configuration phase, not execution. Each variant of the name, like Friendlydebug, is capitalized (Friendlydebug), and then the corresponding installation task (INSTALLFRIENDLYDEBUG) is added to the installdebugflavors task.This mission is in the configuration phas
Recently made a login dialog box, in the acquisition of data errors, when running the automatic panic.Error statement:EditText Passwordeidttext = (EditText) Findviewbyid (R.id.userpasswordeidttext); Send textString message =passwordeidttext.gettext (). toString ();should be modified to:EditText Passwordeidttext = (EditText) Dialogview. Findviewbyid (R.id.userpasswordeidttext); Send textString message =passwordeidttext.gettext (). toString ();Resources for Online Search:Get a custom dialog boxFin
(i) Global access to the context1. Create Applicationutil class inherits from Application class:1 Public classApplicationutilextendsApplication {2 3 Private Staticcontext context;4 5 @Override6 Public voidonCreate () {7Context =Getapplicationcontext ();8 }9 Ten Public StaticContext GetContext () { One returncontext; A } -}2. In the Androidmanifest.xml file, change the Name property of the application tag (if no attribute is added) to: Package name. applicationutil.
In the Android project, we often need to refer to third-party dependent package library, you may encounter the following reference error questions:Re-open the display management error after setting up the library is reference there is a red fork, Eclipse did not error.Then it is possible because:under the Windows system , your project is not in the same drive or directory as the library project you are referencing. Because if the ANDROID.LIBRARY.REFER
; TableRow> TableRow> TextViewAndroid:layout_height= "Wrap_content"Android:text= "Password:"/> EditTextAndroid:id= "@+id/passwordinput"Android:layout_height= "Wrap_content"Android:hint= "Input to Password"/> TableRow> TableRow> ButtonAndroid:id= "@+id/loginbutton"Android:layout_height= "Wrap_content"Android:layout_span= "2"Android:text= "Login"/> TableRow>Tablelayout>The results shown are: Obviously, it's ugly, we want to have a certain amount of space betwee
[Android Notes] Precautions for deleting an item in ArrayAdapter: Android arrayadapterArrayAdapter provides the remove Method to delete data from the data source and refresh the interface. The source code is as follows:
Public void remove (T object) {synchronized (mLock) {if (mOriginalValues! = Null) {mOriginalValues. remove (object) ;}else {mObjects. remove (obj
= "font-size:medium;" >) where xxx activity string getstringextra if boolean getbooleanextra And so on, you can find it yourself. ( 2 some can have default values, such as Getintextra There are two parameters, the first is the key name, and the second is the default value, which means that if the key value does not exist, the default value is used. classAndroidAmong the threads1 , in UI cannot be modified outside the thread UI the. So who creates the view who can go and modify it.
used Android Studio,android Studio to provide a variety of architectures (Android, Project files, etc.), my personal favorite is Android, This is also the default structure, which I will introduce based on the Android structure.
Manifests: Store the Androidmanifest
.
Hal Initial New version architecture:
① Initial Architecture: Use the library (. so file) on the Android system to call the Linux driver for kernel space, and then the Android application (. APK) can access the library in the HAL through the NDK program, or access the HAL's library directly in the Android application.② new version of the schema:
For details, refer to the Development notes of an Android tablet project-scheduled task backup
Create a class to inherit from asynctask
Public class backuptask extends asynctask // Obtain the path of the database in use. My path is/dlion/db_dlion.db under the sdcard directory.// The default path is/data/(package name)/databases /*. DB file dbfile = mcontext. getdatabasepath (environment. getexternalstoraged
work what, can also add points. Sometimes I look at my previous notes and look at those one hundred or two hundred notes, which is a full sense of accomplishment. But at that time to write notes too casual, this review, is in the past notes on the basis of the leak, refine, merger of similar, toPerfection! look at the
Android 4.4 Kitkat,write_media_storage permissions are only available to system apps and no longer granted to third party apps.There are also new rules for writing secondary external storage device.The documentation for Android is written like this:Link:http://source.android.com/devices/tech/storage/index.html:
the Primary external storage on a device. Apps must not being allowed TONBSP;write to s
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