Change text color depending on Dark or light mode "Native ads"

user_9152411 0
Viewed 247

I'm using native ads in my flutter app the ad layout designed by android native XML File and I have a dark and light theme in my flutter app I want to change native ads text colour when the user change to dark/light mode.

the native ad text colours are set in android native code, not in dart files.

kotlin code :

package com.codelab.flutter.admobinlineads;

import com.google.android.gms.ads.nativead.NativeAd;
import com.google.android.gms.ads.nativead.NativeAdView;

import android.content.Context;
import android.view.LayoutInflater;
import android.view.View;
import android.widget.ImageView;
import android.widget.TextView;

import java.util.Map;

import io.flutter.plugins.googlemobileads.GoogleMobileAdsPlugin;

class ListTileNativeAdFactory implements GoogleMobileAdsPlugin.NativeAdFactory {

    private final Context context;

    ListTileNativeAdFactory(Context context) {
        this.context = context;
    }

    @Override
    public NativeAdView createNativeAd(
            NativeAd nativeAd, Map<String, Object> customOptions) {
        NativeAdView nativeAdView = (NativeAdView) LayoutInflater.from(context)
                .inflate(R.layout.list_tile_native_ad, null);

        TextView attributionViewSmall = nativeAdView
                .findViewById(R.id.tv_list_tile_native_ad_attribution_small);
        TextView attributionViewLarge = nativeAdView
                .findViewById(R.id.tv_list_tile_native_ad_attribution_large);

        ImageView iconView = nativeAdView.findViewById(R.id.iv_list_tile_native_ad_icon);
        NativeAd.Image icon = nativeAd.getIcon();
        if (icon != null) {
            attributionViewSmall.setVisibility(View.VISIBLE);
            attributionViewLarge.setVisibility(View.INVISIBLE);
            iconView.setImageDrawable(icon.getDrawable());
        } else {
            attributionViewSmall.setVisibility(View.INVISIBLE);
            attributionViewLarge.setVisibility(View.VISIBLE);
        }
        nativeAdView.setIconView(iconView);

        TextView headlineView = nativeAdView.findViewById(R.id.tv_list_tile_native_ad_headline);
        headlineView.setText(nativeAd.getHeadline());
        nativeAdView.setHeadlineView(headlineView);

        TextView bodyView = nativeAdView.findViewById(R.id.tv_list_tile_native_ad_body);
        bodyView.setText(nativeAd.getBody());
        bodyView.setVisibility(nativeAd.getBody() != null ? View.VISIBLE : View.INVISIBLE);
        nativeAdView.setBodyView(bodyView);

        nativeAdView.setNativeAd(nativeAd);

        return nativeAdView;
    }
}

///////////////////////////////////////////////////////////////////

ad layout :

<?xml version="1.0" encoding="utf-8"?>
<com.google.android.gms.ads.nativead.NativeAdView
    xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="match_parent"
    android:layout_height="match_parent">

    <FrameLayout
        android:layout_width="match_parent"
        android:layout_height="match_parent">

        <TextView
            android:id="@+id/tv_list_tile_native_ad_attribution_small"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:background="#F19938"
            android:text="Ad"
            android:textColor="#FFFFFF"
            android:textSize="12sp" />

        <ImageView
            android:id="@+id/iv_list_tile_native_ad_icon"
            android:layout_width="48dp"
            android:layout_height="48dp"
            android:layout_gravity="center_vertical"
            android:layout_marginStart="16dp"
            android:layout_marginLeft="16dp"
            android:scaleType="fitXY"
            tools:background="#EDEDED" />

        <TextView
            android:id="@+id/tv_list_tile_native_ad_attribution_large"
            android:layout_width="48dp"
            android:layout_height="48dp"
            android:layout_gravity="center_vertical"
            android:layout_marginStart="16dp"
            android:layout_marginLeft="16dp"
            android:background="#F19938"
            android:gravity="center"
            android:text="Ad"
            android:textColor="#FFFFFF"
            android:visibility="invisible" />

        <LinearLayout
            android:layout_width="match_parent"
            android:layout_height="wrap_content"
            android:layout_gravity="center_vertical"
            android:layout_marginStart="80dp"
            android:layout_marginLeft="80dp"
            android:layout_marginEnd="16dp"
            android:layout_marginRight="16dp"
            android:orientation="vertical">

            <TextView
                android:id="@+id/tv_list_tile_native_ad_headline"
                android:layout_width="wrap_content"
                android:layout_height="wrap_content"
                android:ellipsize="end"
                android:lines="1"
                android:maxLines="1"
                android:textColor="#000000"
                android:textSize="16sp"
                tools:text="Headline" />

            <TextView
                android:id="@+id/tv_list_tile_native_ad_body"
                android:layout_width="wrap_content"
                android:layout_height="wrap_content"
                android:ellipsize="end"
                android:lines="1"
                android:maxLines="1"
                android:textColor="#828282"
                android:textSize="14sp"
                tools:text="body" />

        </LinearLayout>

    </FrameLayout>

</com.google.android.gms.ads.nativead.NativeAdView>

native ads

flutter kotlin admob xml
2 Answers

The key is using customOptions for the native Ad.

So in Flutter, you would initialize NativeAd as follows:

NativeAd nativeAd = NativeAd(
  adUnitId: adUnitId,
  factoryId: factoryId,
  request: AdRequest(),
  listener: NativeAdListener(
    onAdLoaded: (Ad ad) {
      if(onAdLoaded != null) { onAdLoaded(); }
    },
    onAdFailedToLoad: (ad, error) {
      ad.dispose();
    },
  ),
  customOptions: {
    ‘darkMode’: isDarkMode,
  }
);

Then in Java, you can just use something like this (after initializing headlineView):

Boolean darkMode = (Boolean) customOptions.get(“darkMode”);
if (darkMode == null) { darkMode = false; }
headlineView.setTextColor(Color.parseColor(darkMode ? “#FFFFFF” : “#000000”));

Let me know if I misunderstood the question or if you need any more information!!

user_64433690

Create two files one for light theme \color.xml, another one for dark theme \color.xml(night)

colors.xml

    <?xml version="1.0" encoding="utf-8"?>
      <resources>
           <color name="text_primary">#FFFFFF</color>
      </resources>

colors.xml(night)

<?xml version="1.0" encoding="utf-8"?>
      <resources>
           <color name="text_primary">#333333</color>
      </resources>

In layout

 <TextView
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="@string/app_name"
        android:textColor="@color/text_primary"
        />

it will change textcolor automatically.

user_191159310
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