android-context – Page 2

Android Asyntask: Use weak reference for context to avoid device rotate screen

September 6, 2023 by Tarik

Somewhere in your AsyncTask you’ll want to pass in your activity. Then you’ll save that reference in a weak reference. Then you can dereference and use it again in onPostExecute. Class member: WeakReference<Activity> weakActivity; Somewhere in AsyncTask, probably either constructor or onPreExecute: weakActivity = new WeakReference<Activity>(activity); In onPostExecute: Activity activity = weakActivity.get(); if (activity != … Read more

Android : References to a Context and memory leaks

August 31, 2023 by Tarik

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

How to mock Context using Mockito?

August 29, 2023 by Tarik

Context context = mock(Context.class);

How to start an Intent if context is not Activity Context but Application Context

August 16, 2023 by Tarik

Here is sample code how to call another activity using context, set flag as per your requirement: public void onReceive(Context context, Intent intent) { Intent intent = new Intent(); intent.setClass(context, xxx.class); intent.setAction(xxx.class.getName()); intent.setFlags(Intent.FLAG_ACTIVITY_NEW_TASK | Intent.FLAG_ACTIVITY_EXCLUDE_FROM_RECENTS); context.startActivity(intent); }

Android: ProgressDialog doesn’t show

August 7, 2023 by Tarik

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

Android: why must use getBaseContext() instead of this

August 5, 2023 by Tarik

getApplicationContext () returns the application context of the entire application life cycle,when application will destroy then it will destroy also. this the context returns the current context of the activity, belong to the activity, the activity is destroyed then it will destroy also.but in your case it will refers to the Spinner instance because we … Read more

Difference between getContext() and requireContext() when using fragments

August 5, 2023 by Tarik

getContext() returns a nullable Context. requireContext() returns a nonnull Context, or throws an exception when one isn’t available. If your code is in a lifecycle phase where you know your fragment is attached to a context, just use requireContext() to get a Context and also keep static analyzers happy about potential NPE issues. If your … Read more

Write/create file within Android Instrumentation context

August 3, 2023 by Tarik

I can’t recall when this was changed, but the current method to get a Context object during Instrumented testing is to import import android.support.test.InstrumentationRegistry; and call InstrumentationRegistry.getContext(); Hope this helps!

Diffinitive rules for using Android’s getBaseContext, getApplicationContext or using an Activity’s “this”

July 21, 2023 by Tarik

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.

Android 13 (SDK 33): PackageManager.getPackageInfo(String, int) deprecated. what is the alternative?

July 17, 2023 by Tarik

If you are using Kotlin, you can add extension function to your project: fun PackageManager.getPackageInfoCompat(packageName: String, flags: Int = 0): PackageInfo = if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.TIRAMISU) { getPackageInfo(packageName, PackageManager.PackageInfoFlags.of(flags.toLong())) } else { @Suppress(“DEPRECATION”) getPackageInfo(packageName, flags) } and after just call packageManager.getPackageInfoCompat(packageName) or add another flag, if you need.