android – How to get view from context?
For example you can find any textView: TextView textView = (TextView) ((Activity) context).findViewById(R.id.textView1);
android-context
Use of Context to start another Activity
Yes its different for different cases, It depends on the scope. Suppose if you are creating a method in a global class that extends Application to create a Toast that is used in every class of your Application you can use getApplicationContext() to create it. If you want to create a view that is restricted … Read more
Getting the Application Context
The easiest way to get the application context is: Create a class App that extends android.app.Application public class App extends Application { public static Context context; @Override public void onCreate() { super.onCreate(); context = getApplicationContext(); } } Modify your AndroidManifest.xml ‘s <application> tag to have the attribute android:name=”your.package.name.App”. Any time you need the application context, … Read more
Accessing Resources without a Context
Use Resources.getSystem().getString(android.R.string.someuniversalstuff) You can use it ABSOLUTELY EVERYWHERE in your application, even in static constants declaration! But for system resources only. For local resources use that solution.
Android : References to a Context and memory leaks
This is fine, and will not cause a memory leak. As soon as onCreate finishes executing, h will be out of scope and become eligible for garbage collection. If h was static, then you would run into problems. Only when the reference to the context outlives the lifecycle of the context itself will a memory … Read more
Android: ProgressDialog doesn’t show
you have to call pd.show before the long calculation starts and then the calculation has to run in a separate thread. A soon as this thread is finished, you have to call pd.dismiss() to close the prgoress dialog. here you can see an example: the progressdialog is created and displayed and a thread is called … Read more
Diffinitive rules for using Android’s getBaseContext, getApplicationContext or using an Activity’s “this”
The getBaseContext() is the method of ContextWrapper. And ContextWrapper is, “Proxying implementation of Context that simply delegates all of its calls to another Context. Can be subclassed to modify behavior without changing the original Context.” (as per javadocs) So this is used to delegate the calls to another context.
How to call getResources() from a class which has no context?
A Context is a handle to the system; it provides services like resolving resources, obtaining access to databases and preferences, and so on. It is an “interface” that allows access to application specific resources and class and information about application environment. Your activities and services also extend Context to they inherit all those methods to … Read more
How to get my activity context?
Ok, I will give a small example on how to do what you ask public class ClassB extends Activity { ClassA A1 = new ClassA(this); // for activity context ClassA A2 = new ClassA(getApplicationContext()); // for application context. }
How to retrieve a context from a non-activity class?
This problem seem to arise a lot in Android development. One solution to obtaining a reference to a specific Context is subclassing the Application and grab a reference to the Context which you want. public class MyApplication extends Application { private Context context; @Override public onCreate() { super.onCreate(); this.context = getApplicationContext() // Grab the Context … Read more