如何在Android中覆盖Admob奖励广告计时器文本

implementation 'com.google.android.gms:play-services-ads:20.3.0'

<com.google.android.gms.ads.AdView
    android:id="@+id/adView"
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    ads:adSize="BANNER"
    ads:adUnitId="YOUR_AD_UNIT_ID"
    />

AdView adView = findViewById(R.id.adView);
AdRequest adRequest = new AdRequest.Builder().build();
adView.loadAd(adRequest);

<TextView
    android:id="@+id/timerTextView"
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:textColor="#FFFFFF"
    android:textSize="16sp"
    />

AdView adView = findViewById(R.id.adView);
final TextView timerTextView = findViewById(R.id.timerTextView);

adView.setAdListener(new AdListener() {
    @Override
    public void onAdLoaded() {
        super.onAdLoaded();
        timerTextView.setText("计时器文本");
    }
    
    @Override
    public void onAdClosed() {
        super.onAdClosed();
        timerTextView.setText("");
    }
});