Introduction to Android (First day)

Android structure (because you can not upload pictures, so please search yourself!!) ）

Then the difference between the DVM and the JVM Dalvik is based on the register and the JVM is in memory 2, the bytecode file generated by the JVM is. Class and Dalvik is Dex Format 3 "Dalvik is able to run multiple and the JVM only runs one!

Create a project and then analyze the structure of the project:

SRC----The source code written

Gen----Auto-generated files include R.java

Res-----resource files include

------drawable------Picture Resources

------Layout------Layouts Resources

------values-----Some constant resources

Androidmanifest.xml------Application feature configuration Checklist!!

Analyze the composition of the APK installation file

Res-------resource files in a project

Androidmainifest.xml---features manifest file

Classes.dex---All class files for public DVM Execution (Dalvik)

Analyze the directory structure of Android system files:

650) this.width=650; "src="/e/u261/themes/default/images/spacer.gif "style=" Background:url ("/e/u261/lang/zh-cn/ Images/localimage.png ") no-repeat center;border:1px solid #ddd;" alt= "Spacer.gif"/>

./represents the root directory of the system

/data/app

Third-party apk files

/system/app

APK file for System

/data/data/packagename

Folder for items

/storage/sdcard

SD Card Folder

SDK File Structure Directory

Doc-------document file with API, etc.

Platforms-----platform contains each version of the file

Platform-tools-------include some development tools, such as ADB. Exe,sqlite3.exe

Samples------Some sample projects provided by Google

SOURCE------contains part of the system's source code

Tools-----include some development tools such as Draw9patch. BAT, Hierarchyviewer.bat

ADB and common commands

ADB Debug Bridge Debugging tool

No Adb.exe and Ecplice connection to manage device and emulator status

1adb-shell Enter the system's root directory LS view CD entry

2ADB Install-r Apkpath

3 adb start-server

4 adb Kill-server

Ddms

650) this.width=650; "src="/e/u261/themes/default/images/spacer.gif "style=" Background:url ("/e/u261/lang/zh-cn/ Images/localimage.png ") no-repeat center;border:1px solid #ddd;" alt= "Spacer.gif"/>

Next, do a download exercise!

6. Related APIs:

Activity:

OnCreate (): Automatically called callback method in which the layout display is loaded

Setcontentview (int layoutid): Load layout

View Findviewbyid (ID): Find the corresponding View object based on the ID

R:

R.drawable: Internal class containing all the image resource identifiers

R.layout: Internal class containing all layout resource identities

R.id: Internal class containing all view ID identifiers

R.string: Inner class containing all string identifiers

View/button

Setonclicklistener (Listener): Set the view to click to listen

View.onclicklistener: Internal interface

OnClick () callback method

Toast: A class used to display short-time prompt text

Static Toast Maketext (context context, String text, int duration): Create a Toast Object

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Introduction to Android (First day)