android

How can I save an activity state using the save instance state?

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You need to override onSaveInstanceState(Bundle savedInstanceState) and write the application state values you want to change to the Bundle parameter like this: @Override public void onSaveInstanceState(Bundle savedInstanceState) { super.onSaveInstanceState(savedInstanceState); // Save UI state changes to the savedInstanceState. // This bundle will be passed to onCreate if the process is // killed and restarted. savedInstanceState.putBoolean(“MyBoolean”, true); … Read more

Is there a unique Android device ID?

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Settings.Secure#ANDROID_ID returns the Android ID as an unique for each user 64-bit hex string. import android.provider.Settings.Secure; private String android_id = Secure.getString(getContext().getContentResolver(), Secure.ANDROID_ID); Also read Best practices for unique identifiers: https://developer.android.com/training/articles/user-data-ids

How to stop EditText from gaining focus when an activity starts in Android?

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Adding the tags android:focusableInTouchMode=”true” and android:focusable=”true” to the parent layout (e.g. LinearLayout or ConstraintLayout) like in the following example, will fix the problem. <!– Dummy item to prevent AutoCompleteTextView from receiving focus –> <LinearLayout android:focusable=”true” android:focusableInTouchMode=”true” android:layout_width=”0px” android:layout_height=”0px”/> <!– :nextFocusUp and :nextFocusLeft have been set to the id of this component to prevent the dummy … Read more

Why is the Android emulator so slow? How can we speed up the Android emulator? [closed]

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Update You can now enable the Quick Boot option for Android Emulator. That will save emulator state, and it will start the emulator quickly on the next boot. Click on Emulator edit button, then click Show Advanced Setting. Then enable Quick Boot like below screenshot. Android Development Tools (ADT) 9.0.0 (or later) has a feature … Read more

Proper use cases for Android UserManager.isUserAGoat()?

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Android R Update: From Android R, this method always returns false. Google says that this is done “to protect goat privacy”: /** * Used to determine whether the user making this call is subject to * teleportations. * * <p>As of {@link android.os.Build.VERSION_CODES#LOLLIPOP}, this method can * now automatically identify goats using advanced goat recognition … Read more

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