Android – Theme.AppCompat.Light resource not found in Android Studio

androidandroid-appcompatandroid-studio

When trying to extend ActionBarActivity I need to use the AppCompat theme (Theme.AppCompat.Light). When I try to add it in the manifest and styles.xml I get

Error:(31, 28) No resource found that matches the given name (at
'theme' with value '@android:style/Theme.AppCompat.Light').

Eventhough I have downloaded the support libraries and included this in my build.gradle file ->

dependencies {
compile 'com.android.support:appcompat-v7:19.0.+'
compile 'com.android.support:support-v4:19.0.+'}

Best Answer

In Android Studio, I had this same error when using android:theme='@android:style/Theme.AppCompat.Light but when I use android:theme="@style/Theme.AppCompat.Light" inside the AndroidManifest.xml file, the error is gone.

The difference appears to be from referring to an Android system wide provided theme "@android", to a locally defined theme "@style". Using the locally defined theme works due to having defined the gradle dependency on the appcompat library compile 'com.android.support:appcompat-v7:19.0.+', which is imported as a local theme.

For reference, the official documentation from Google for Android Developers around adding the ActionBar on Android devices 2.1+ instructs to use: android:theme="@style/Theme.AppCompat.Light" https://developer.android.com/training/basics/actionbar/setting-up.html

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Android – How to close/hide the Android soft keyboard programmatically

You can force Android to hide the virtual keyboard using the InputMethodManager, calling hideSoftInputFromWindow, passing in the token of the window containing your focused view.

// Check if no view has focus:
View view = this.getCurrentFocus();
if (view != null) {  
    InputMethodManager imm = (InputMethodManager)getSystemService(Context.INPUT_METHOD_SERVICE);
    imm.hideSoftInputFromWindow(view.getWindowToken(), 0);
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This will force the keyboard to be hidden in all situations. In some cases, you will want to pass in InputMethodManager.HIDE_IMPLICIT_ONLY as the second parameter to ensure you only hide the keyboard when the user didn't explicitly force it to appear (by holding down the menu).

Note: If you want to do this in Kotlin, use: context?.getSystemService(Context.INPUT_METHOD_SERVICE) as InputMethodManager

Kotlin Syntax

// Only runs if there is a view that is currently focused
this.currentFocus?.let { view ->
    val imm = getSystemService(Context.INPUT_METHOD_SERVICE) as? InputMethodManager
    imm?.hideSoftInputFromWindow(view.windowToken, 0)
}

Android – unique Android device ID

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

Best Answer

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