iniyanmurugavel

This crash is present on:

all Samsung devices 7.0

all Nexus devices on 7.1.2


When the device is being restarted, you cannot run an app. Any app, not just yours but any given app cannot run when the device is restarting. AFAIK it occurs when you try to do something when the system crashes. 
Meaning if the system crashes and as it restarts your app starts a service or does something you get that error.

iniyanmurugavel

And now you just need to call the method isHacked from your onCreate method in your initial Activity to check that your application was renamed or relocated.

public boolean isHacked(Context context, String myPackageName, String google, String amazon)
{
  //Renamed?
  if (context.getPackageName().compareTo(myPackageName) != 0) {
      return true; // BOOM!
  }

  //Relocated?

iniyanmurugavel

File and code templates option in android studio to automate creation of recyclerview adapter.
AndroidStudio -> Preference->Editor->File and Code Template

Click plus icon at the top then you will see a panel with name, extension and code template editor. All you need to do is enter the template name, mention the extension(kt, java or xml) and paste the above template here and click OK. It’s done, all you need to do is just navigate to the package where you want to create the adapter and right click on it and select then you should see a file with name you mentioned while creating file template.
Feel free to comment if there any suggestions or improvements



#if (${PACKAGE_NAME} && ${PACKAGE_NAME} != "")package ${PACKAGE_NAME}#end

iniyanmurugavel

#About Security 
Absolute security does not exist. Security is a set of measures, being piled up and combined, trying to slow down the inevitable.
https://medium.com/google-developer-experts/a-follow-up-on-how-to-store-tokens-securely-in-android-e84ac5f15f17
NDK Decode :-
        String key1 = new String(Base64.decode(getNativeKey1(),Base64.DEFAULT));
        String key2 = new String(Base64.decode(getNativeKey2(),Base64.DEFAULT));
https://medium.com/@abhi007tyagi/storing-api-keys-using-android-ndk-6abb0adcadad
https://medium.com/@himanshusoni501/safest-way-to-secure-your-app-server-credentials-7894fb4f4fe4

iniyanmurugavel

If you have this in your gradle :

 compileOptions {
        sourceCompatibility JavaVersion.VERSION_1_8
        targetCompatibility JavaVersion.VERSION_1_8
    }
then you are telling android to use java 8.

iniyanmurugavel

Methods to store in Internal Storage(GT):

Both these methods are present in Context class

File getDir (String name, int mode)

File getFilesDir () 
Methods to store in Primary External Storage i.e. Internal Storage(UT):

iniyanmurugavel

https://console.developers.google.com/apis/credentials?project=api-5298280870467023733-962021
https://proandroiddev.com/how-to-automate-google-play-store-releases-c4c2a4b19435
https://unicorn-utterances.com/posts/travis-ci-for-android/#Part-B-Dummy-files
https://proandroiddev.com/change-language-programmatically-at-runtime-on-android-5e6bc15c758

$ git tag -a v1.4 -m "my version 1.4"
$ git tag
Useful Links 
./gradlew publishApkRelease

iniyanmurugavel

Work Manager 

WorkManager is an API that makes it easy to schedule deferrable, asynchronous tasks that are expected to run even if the app exits or the device restarts. The WorkManager API is a suitable and recommended replacement for all previous Android background scheduling APIs
Device support from 14 -22 it will work on alarm manager with broadcast to process scheduling and GCM NetworkManager 
Device above 23 + all uses JobSchedular 

usecases : 
Dynamic  Feature modules and clean architecture
Backup chat like whatsapp after a hours or 1 in a day 
update news in any news app - phone in charge or connect with constraint and executes the task and impl 

iniyanmurugavel

https://blog.mindorks.com/understanding-livedata-in-android
LiveData considers an observer, which is represented by the Observer class, to be in an active state if its lifecycle is in the STARTED or RESUMED state. LiveData only notifies active observers about updates. Inactive observers registered to watch LiveData objects aren't notified about changes.

Features

Ensures your UI matches your data state
No memory leaks
No crashes due to stopped activities
No more manual lifecycle handling

iniyanmurugavel

ProGuard is a generic optimizer for Java bytecode.
DexGuard is a specialized tool for the protection of Android applications.

ProGuard is a versatile optimizer for Java bytecode. It enables you to shrink, optimize and obfuscate desktop applications, embedded applications and mobile applications (Android)

DexGuard, on the other hand, is specifically designed to protect and optimize Android applications. The multilayered protection DexGuard provides is adapted to the distributed and quickly evolving environment in which mobile applications are used. In addition, DexGuard offers functionality that helps you to make optimal use of the Android platform. It comes with a tuned configuration for the Android runtime and for common libraries (Google Play Services, Dagger, Realm, SQLCipher etc.) and automatically splits DEX files that exceed the size limits imposed by the format (MultiDex).