android-context - w3toppers.com

How can I share a SharedPreferences file across two different android apps?

It is better to set private mode for the file. App needs to be signed with same set of certificates to share this file. Set sharedUserId in both apps to be same. <manifest xmlns:android=”http://schemas.android.com/apk/res/android” package=”com.example.hello” android:versionCode=”1″ android:versionName=”1.0″ android:sharedUserId=”com.example”> …. Get Context from other package: mContext = context.createPackageContext( “com.example.otherapp”, Context.MODE_PRIVATE); mPrefs = mContext.getSharedPreferences(“sameFileNameHere”, Activity.MODE_PRIVATE); Get items … Read more

What is the difference between Activity and Context?

As far as I understand: Context is the Base Object. So every Activity same as Application derives from Context. This means that every Activity and every Application IS a Context; From developer.android.com Activity java.lang.Object ↳ android.content.Context ↳ android.content.ContextWrapper ↳ android.view.ContextThemeWrapper ↳ android.app.Activity And Application java.lang.Object ↳ android.content.Context ↳ android.content.ContextWrapper ↳ android.app.Application An Application context lasts, … Read more

getting context in AsyncTask

You need to do following things. when you want to use AsyncTask, extend that in other class say MyCustomTask. in constructor of new class, pass Context Example public class MyCustomTask extends AsyncTask<Void, Void, Long> { private Context mContext; public MyCustomTask (Context context){ mContext = context; } //other methods like onPreExecute etc. protected void onPostExecute(Long result) … Read more

getApplicationContext(), getBaseContext(), getApplication(), getParent()

getApplicationContext() Application context is associated with the Applicaition and will always be the same throughout the life cycle. getBasecontext() should not be used, just use Context instead of it which is associated with the activity and could possible be destroyed when the activity is destroyed. getApplication() is available to Activity and Services only. Although in … Read more

getString Outside of a Context or Activity

Yes, we can access resources without using `Context` You can use: Resources.getSystem().getString(android.R.string.somecommonstuff) … everywhere in your application, even in static constants declarations. Unfortunately, it supports the system resources only. For local resources use this solution. It is not trivial, but it works.

Android : Static Fields and Memory Leaks

In Java/Android a static variable or constant will not be garbage collected. It just stays there once the class that holds it is loaded via a class loader. The class loader is afaik always the same for all classes inside your app and its the one that has static references to all your classes (to … Read more

Using getResources() in non-activity class

You will have to pass a context object to it. Either this if you have a reference to the class in an activty, or getApplicationContext() public class MyActivity extends Activity { public void onCreate(Bundle savedInstanceState) { RegularClass regularClass = new RegularClass(this); } } Then you can use it in the constructor (or set it to … Read more

How to get a context in a recycler view adapter

You have a few options here: Pass Context as an argument to FeedAdapter and keep it as class field Use dependency injection to inject Context when you need it. I strongly suggest reading about it. There is a great tool for that — Dagger by Square Get it from any View object. In your case … Read more

What’s “tools:context” in Android layout files?

This is the activity the tools UI editor uses to render your layout preview. It is documented here: This attribute declares which activity this layout is associated with by default. This enables features in the editor or layout preview that require knowledge of the activity, such as what the layout theme should be in the … Read more

difference and when to use getApplication(), getApplicationContext(), getBaseContext() and someClass.this

Toast and Intent, both requires reference to context. And getApplication, getApplicationContext, LoginActivity.this and getBaseContext, they all offer reference to the context. Now the thing confuses is the declaration of different contexts and their specific-usage. To make things simple, you should count two types of context available in the Android framework. Application Context Activity Context Application … Read more