android

How can I disable landscape mode in Android?

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Add android:screenOrientation=”portrait” to the activity in the AndroidManifest.xml. For example: <activity android:name=”.SomeActivity” android:label=”@string/app_name” android:screenOrientation=”portrait” /> Since this has become a super-popular answer, I feel very guilty as forcing portrait is rarely the right solution to the problems it’s frequently applied to. The major caveats with forced portrait: This does not absolve you of having to … Read more

How to check if a service is running on Android?

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I use the following from inside an activity: private boolean isMyServiceRunning(Class<?> serviceClass) { ActivityManager manager = (ActivityManager) getSystemService(Context.ACTIVITY_SERVICE); for (RunningServiceInfo service : manager.getRunningServices(Integer.MAX_VALUE)) { if (serviceClass.getName().equals(service.service.getClassName())) { return true; } } return false; } And I call it using: isMyServiceRunning(MyService.class) This works reliably, because it is based on the information about running services provided by … Read more

How to convert a Drawable to a Bitmap?

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This piece of code helps. Bitmap icon = BitmapFactory.decodeResource(context.getResources(), R.drawable.icon_resource); Here a version where the image gets downloaded. String name = c.getString(str_url); URL url_value = new URL(name); ImageView profile = (ImageView)v.findViewById(R.id.vdo_icon); if (profile != null) { Bitmap mIcon1 = BitmapFactory.decodeStream(url_value.openConnection().getInputStream()); profile.setImageBitmap(mIcon1); }

Android Studio: Add jar as library?

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I’ve been struggling with the same thing for many hours, trying to get the Gson jar to work no less. I finally cracked it – here are the steps I took: Put the Gson jar (in my case, gson-2.2.4.jar) into the libs folder Right click it and hit ‘Add as library’ Ensure that compile files(‘libs/gson-2.2.4.jar’) … Read more

Static way to get ‘Context’ in Android?

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Do this: In the Android Manifest file, declare the following. <application android:name=”com.xyz.MyApplication”> </application> Then write the class: public class MyApplication extends Application { private static Context context; public void onCreate() { super.onCreate(); MyApplication.context = getApplicationContext(); } public static Context getAppContext() { return MyApplication.context; } } Now everywhere call MyApplication.getAppContext() to get your application context statically.

How to manage startActivityForResult on Android

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From your FirstActivity, call the SecondActivity using the startActivityForResult() method. For example: int LAUNCH_SECOND_ACTIVITY = 1 Intent i = new Intent(this, SecondActivity.class); startActivityForResult(i, LAUNCH_SECOND_ACTIVITY); In your SecondActivity, set the data which you want to return back to FirstActivity. If you don’t want to return back, don’t set any. For example: In SecondActivity if you want … Read more

How to add dividers and spaces between items in RecyclerView

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October 2016 Update The version 25.0.0 of Android Support Library introduced the DividerItemDecoration class: DividerItemDecoration is a RecyclerView.ItemDecoration that can be used as a divider between items of a LinearLayoutManager. It supports both HORIZONTAL and VERTICAL orientations. Usage: DividerItemDecoration dividerItemDecoration = new DividerItemDecoration(recyclerView.getContext(), layoutManager.getOrientation()); recyclerView.addItemDecoration(dividerItemDecoration); Previous answer Some answers either use methods that have since … Read more

R cannot be resolved – Android error

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After tracking down this problem as well, I found this note in the Android documentation: http://source.android.com/source/using-eclipse.html *Note: Eclipse sometimes likes to add an “import android.R” statement at the top of your files that use resources, especially when you ask Eclipse to sort or otherwise manage imports. This will cause your make to break. Look out … Read more