Mobile Defender 13_ Screen Adapter _ exception Handling _ Profit Mode _ confuse encryption

Today is the last day of mobile defender

　　

1, simple screen adaptation :

The ① uses linear , relative , frame layouts , which are three common layouts that can be implemented almost completely on all devices , using more DP,SP, do not use pixels , Dp,sp will automatically adapt to the screen

② Floating Form Displays the distance problem : the distance it shows is pixels , so the display distance does not fit the screen .

The units received in the code are generally pixels .

Workaround : Convert the input number into a dp Unit .

Get the pixel density * pixel to get dp data , based on the screen to achieve the pixel effect

Convert to DP data via tool class Desityutils

2, exception handling for the application :

2.1

Alpha version : Small range of internal tests , Bugs will be more , unstable

Beta version : more stable . you can consider publishing to the market.

Stable version , official version : basically no BUG

2.2

The application pops up the dialog box and stops running .

Rewrite the dialog box to get an exception to the file before the dialog pops up

① Create a class : Application class , inheriting application

Configure the manifest file application interface , Select the name tag , Configure this inheritance class to

②onCreate ()//The first method that executes before the application is created , is appropriate for the application initialization operation .

override the system's exception handler .

Thread.CurrentThread (). Getdefaultuncaughtexceptionhandler ()// Gets the exception handler for the current default uncaught exception , POPs up a dialog box with an abnormal stop

Thread.CurrentThread (). Setuncaughtexceptionhandler (Uncaughtexceptionhandlerhandler);

③ implement this exception handler, overriding the method to catch the exception message

But the virtual machine will still hang up, This is no way , but you can execute a few lines of code , The exception is written in the log

Then kill the current process ( or it will remain stuck on the interface ) early to die , the memory is sufficient to restart the case .

Android.os.Process.KillProcess (Android.os.Process.myPid ());// can only kill their own pid Process

Information processing for ④ application exceptions

Parameters in the Override method Throwable ex, Save the wrong information

Ex.printstacktrace (PS);// Write exception information to the print output stream

PrintWriter pw = new PrintWriter ( string output stream );// write the information into the string input stream

StringWriter SW = new StringWriter (); Sw.tostring ()// can get string

You can write the error message that this SW represents to the file.

⑤ only the wrong information is not enough

Also required : time System.currenttimemillis () to generate the error ;

Mobile phone operating System Information Build, using reflection to get , Getdeclaredfields ();// get field

traverse each field , Field.getname (); // field name

Field.get ( object , static can be null) // field represents the value

Friends League : Developer Service Platform , There is an exception to capture the JAR package more professional

3, Android's profit model

3.1 paid software ( typically less , go desktop with custom theme )

Value-Added Services ( appearing in general games )

Free apps to make money with AD traffic

Advertising platform : Baidu Mobile Alliance , there are meters and so on

Get the JAR Package to the ad platform and view the Help documentation for the platform release . It's a very detailed introduction.

4, encryption obfuscation of the application

In the project.properties file , open The config content config = ${sdk}xx Path

this file under the Sdk proguard-android.txt

Copy this file to the project and modify The filename specified by CONFIG.

Then export the apk ( digitally signed XXXX) so that the generated apk is encrypted and obfuscated.

Principle : when the apk file is generated , the class name and method name are dynamically modified ( the system does not look at the name anyway , The name is just for programmers to easily write. )

Mobile Defender 13_ Screen Adapter _ exception Handling _ Profit Mode _ confuse encryption