1. 确保已正确配置好Admob Android SDK并已导入Google Play服务库。
2. 确保添加了AndroidManifest.xml文件中所有必需的权限和活动声明。
3. 确保在调用广告前已成功加载广告并已设置好奖励回调方法。
4. 确保在调用奖励回调方法时不要在主线程中执行耗时操作。可以使用异步任务或处理程序等方法解决此问题，例如：

private void showRewardedAd() { if (mRewardedVideoAd.isLoaded()) { mRewardedVideoAd.show(); } else { loadRewardedAd(); } }

private void loadRewardedAd() { mRewardedVideoAd.loadAd(getString(R.string.ad_unit_id), new AdRequest.Builder().build()); }

@Override public void onRewarded(RewardItem reward) { Toast.makeText(this, "You have received " + reward.getAmount() + " " + reward.getType() + ".", Toast.LENGTH_LONG).show();

// Do NOT perform lengthy operations here, use AsyncTask or Handler instead
new UpdateRewardsTask().execute(reward.getAmount());

}

private class UpdateRewardsTask extends AsyncTask { @Override protected Void doInBackground(Integer... params) { // Perform lengthy operation here return null; } }