Summary of some less commonly used XML file attributes in AndroidPreface
Some attributes that may not be frequently used in recent projects are used in XML, which may involve AndroidManifest. xml, Layout file Layout, or specific controls!AndroidManifest. xml
①Add tags in the AndroidManifest. xml file
,Xxx. xxx. xxx is the third-party library package name. If mu
One, theBug appears, need to "kill" itBug sounds scary, but as long as you understand,Android bug is very good solution, because Android provides the log mechanism, the specific underlying code, in the future to analyze, as long as you will see the bug,Application development in Android is also very simple.Let's take a look at the ANR in
Android learning notes: AsyncTask implements file download tasks. androidasynctask
(1) This file is mainly used to demonstrate how to download images from Asynchronous tasks.
(2) The layout code is as follows: An ImageView is used to store the downloaded image, and a Button is used to start asynchronous task download.
(3) Control
Package com. example. asyncta
Android for JNI (vi)--cross-compiling, NDK overview and file structure, writing your own first JNI project
Finally back to our Android, we have to configure this NDK environment, but before we have to understand the basic terminology
I. Cross-compilation
Compile a binary program that can be executed by another platform under one platform
You need to distinguish the permissions that the apk has when running from the permissions that are accessed (read/write execution) on the file system.The apk program runs on a virtual machine and corresponds to the unique permission mechanism of Android. It uses linux permission settings only when it is embodied in the file system.(1) linux
http://hold-on.iteye.com/blog/2064642---Original eclipse android settings and modify the generated apk signature fileBlog Category:
Android
Android Eclipse settings and modify the build apk signature file 1, issue: Usually when using Eclipse for Android project
When a program is in the development stage, you can view errors, exceptions, and other information in the development environment. However, when the program is handed over to the test environment or runs on a real device out of the development environment, you cannot be notified of the error.
The only way is to record the log to a text file and view the cause of the error. Therefore, it is very important to record data from days to external storage de
I collected a bunch of Android code from the Internet, such as the login program of Android and the helloworld program of Android, but I still cannot run a correct program correctly. I 've been depressed for a long time, finally, after a test, the program of the self-built project was successfully run in the android si
First, build the environment 1. Installing the JDK and Android SDK 2. Configure Environment variablesD:\android-sdk-windows\toolsC:\Program Files\java\jdk1.6.0_20\bin3. Example InformationProject directory: D:\ProjectDemoSDK Directory: D:\android-sdk-windows\platforms\android-8\Second, the command line to compile the
Document directory
1.
Step 1: Set the simulator to support sdcard
Step 2: Set permissions in the Application
Note:
Suggestion:
There are multiple ways to store data, such as database storage, sharedpreferences storage, and file storage;
Here we will introduce the simplest file storage method;
In simple terms, file storage is the IO stream in the general
Resource Access in Android Resources in Android refer to non-code parts and external files.Generally, native files are stored in assets. For example, MP3 files cannot be directly accessed by Android programs. They must be read in the form of binary streams through the AssetManager class.Resources in res can be directly accessed through the R Resource class.The R
This article illustrates the saving and reading function of the Android implementation file. Share to everyone for your reference, specific as follows:
Note: There are Getfiledir () and Getcachedir () in the activity; method to obtain the current package file path from the current phone's storage space
Getfiledir ()-----/data/data/cn.xxx.xxx (current package)/f
filtered getname () The string returned whether there is ". /”:2, dynamic link library file libdolphin.so, and is not placed in the Application Data Lib directory, but placed in the files directory:The place where the load is used is the searchredirector in the Com.dolphin.browser.search.redirect package:The app uses System.load () to load libdolphin.so instead of system.loadlibrary (), in Android, System.
is part of the media/download system.These test keys is used strictly in development, and should never be assumedTo convey any sort of validity. When $BUILD _secure=true, the code should notHonor these keys in any context.Signing using the OpenSSL commandline (for Boot/system images)--------------------------------------------------------------1. Convert pk8 format key to PEM format% OpenSSL pkcs8-inform der-nocrypt-in testkey.pk8-out Testkey.pem2. Create a signature using the PEM format key% O
is part of the media/download system.These test keys is used strictly in development, and should never be assumedTo convey any sort of validity. When $BUILD _secure=true, the code should notHonor these keys in any context.Signing using the OpenSSL commandline (for Boot/system images)--------------------------------------------------------------1. Convert pk8 format key to PEM format% OpenSSL pkcs8-inform der-nocrypt-in testkey.pk8-out Testkey.pem2. Create a signature using the PEM format key% O
The overall process is divided into the following 6 steps:1, installation Java_jdk2. Configuring Java Environment variables3. Update the Android SDK4. Release the apk file from Unity3d5. Create an Android virtual machine and run it6. Install the APK file into the Android vir
A few words.
Using Gradle and its recommended project framework
Put sensitive data such as passwords into Gradle.properties
Do not write HTTP clients yourself, use volley or okhttp libraries
Use the Jackson Library to parse JSON data
Avoid guava and Dalvik 65K methods limit do not use too many libraries
Using fragment to draw UI interfaces
Activity is mainly used to manage fragment
Layout file XML is also code, organize the
1. Structure of the android File SystemAfter the android source code is compiled, the system. IMG, ramdisk. IMG, and userdata. IMG image files are obtained.
Ramdisk. IMG is the file system of emulator. IMG includes the main packages, libraries, and other files, userdata. IMG includes user data. After loading these thre
installation package. In Windows, it is difficult to extract installed programs into an installation package. However, Android and Windows are very different. We can extract installed apps from Android as the Apk installation package. Let's take a look at how to do it.
Extract Apk directly from the root directory
Download the new version of manager series software:
RE
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