android-context

I have simple code snippet to implement custom list view. In this code, I have CustomAdapter class which extends ArrayAdapter : CustomAdapter adapter = new CustomerAdapter(getApplicationContext(),R.layout.listview_item_row, weather_data); The constructor of CustomAdapter is as below: public CustomerAdapter(Context context, int layoutResourceId, weather[] data) { super(context, layoutResourceId, data); mlayoutResourceId = layoutResourceId; mcontext = context; mdata = data; } If I write this, the logcat shows following error: Java.lang.ClassCastException: android.app.Application context can not

How to use SharedPreferences in a class without oncreate ? I get null pointer when accessing it. public class Ftr extends Activity { SharedPreferences preferences; Context ab=this; public void ft() { preferences = PreferenceManager.getDefaultSharedPreferences(ab); String result = preferences.getString("F",""); } } I'm calling Function ft() from another activity Ftr is just a class not an activity. How can I use SharedPreferences in this condition? You can take in Common method or Utils So use in All Method. public static void SaveInPreference(Context mContext, String key, String objString) {

This question already has answers here : Closed 7 years ago . Possible Duplicate: Android - what's the difference between the various methods to get a Context? I want to know what's the difference between using this , ClassName.this , getApplicationContext() or myContext ? What are the effects of using each as context in the Toast below? public class ClassName extends Activity { final ClassName myContext = this; ... public void onCreate(Bundle savedInstanceState) { ... button.setOnClickListener(new OnClickListener(){ public void onClick(View v) { Toast.makeText(getApplicationContext(), "This

I'm looking for the best way to start an intent from a class that is not an Activity, but is a contained object of an Activity class. For example the Activity Class: Class MainActivity extends ListActivty { ... TestLauncher tester; } and the class that I want to start the intent from: Class TestLauncher { public TestLauncher () { //Code to create an intent needs a Context //Intent i = new Intent(Context, class) //Code to start activity needs to be called with an Activity //Activity.StartActivity(i); } } What is the best way to do this architecturally? Should I pass MainActivity as a parameter

I am trying to implement the following singleton pattern: SingletonClass.getInstance(context).callMethod() While there are a variety of tutorials that explain how to make singletons in Kotlin, none of them address the fact that holding a context in a static field will cause memory leaks in Android. How do I create the above pattern without creating a memory leak? Update: Here is my implementation of CommonsWare's solution #2. I used Koin. Singleton class: class NetworkUtils(val context: Context) { } Application Class: class MyApplication : Application() { val appModule = module { single {

I am using Dagger 2 DataBindng and the new Android Lifecycle components, which have ViewModels . Inside my ViewModel how could I get access to my strings.xml? I was thinking at first, to inject a Context into the viewModel , however, this will just leak memory. Are there any other ways? There is an AndroidViewModel , which receives Application instance as parameter. From docs: Application context aware ViewModel . Subclasses must have a constructor which accepts Application as the only parameter. You can retrieve a string from strings.xml using that parameter. The repo in the link, however