admob banner position

[huymc]

I created a project in cordova cli then imported it into android studio via gradle. I managed to put admob into the project but the banner is on top of the layout. I want to put it at the bottom of the layout. Can someone help?
This is the code in androidmanifest.xml:

<?xml version='1.0' encoding='utf-8'?>
<manifest android:hardwareAccelerated="true" android:versionCode="10000" android:versionName="1.0.0" package="xxx" xmlns:android="http://schemas.android.com/apk/res/android">
    <supports-screens android:anyDensity="true" android:largeScreens="true" android:normalScreens="true" android:resizeable="true" android:smallScreens="true" android:xlargeScreens="true" />
    <uses-permission android:name="android.permission.INTERNET" />
    <application android:hardwareAccelerated="true" android:icon="@mipmap/ic_launcher" android:label="@string/app_name" android:supportsRtl="true">
        <activity android:configChanges="orientation|keyboardHidden|keyboard|screenSize|locale" android:label="@string/activity_name" android:launchMode="singleTop" android:name="MainActivity" android:theme="@android:style/Theme.DeviceDefault.NoActionBar" android:windowSoftInputMode="adjustResize">
            <intent-filter android:label="@string/launcher_name">
                <action android:name="android.intent.action.MAIN" />
                <category android:name="android.intent.category.LAUNCHER" />
            </intent-filter>
        </activity>
        <activity android:configChanges="keyboard|keyboardHidden|orientation|screenLayout|uiMode|screenSize|smallestScreenSize"
            android:name="com.google.android.gms.ads.AdActivity" />
    </application>
    <uses-sdk android:minSdkVersion="16" android:targetSdkVersion="26" />
</manifest>

This is the code in mainactivity.java

import android.os.Bundle;
import org.apache.cordova.*;
import android.view.ViewGroup.LayoutParams;
import android.widget.LinearLayout;
import com.google.android.gms.ads.AdView;
import com.google.android.gms.ads.AdRequest;
import com.google.android.gms.ads.AdSize;

public class MainActivity extends CordovaActivity
{
    private AdView mAdView;
    private String ad_unit_id = "xxx";
    @Override
    public void onCreate(Bundle savedInstanceState)
    {
        super.onCreate(savedInstanceState);

        // enable Cordova apps to be started in the background
        Bundle extras = getIntent().getExtras();
        if (extras != null && extras.getBoolean("cdvStartInBackground", false)) {
            moveTaskToBack(true);
        }

        // Set by <content src="index.html" /> in config.xml
        loadUrl(launchUrl);
        // Set Ads
        LinearLayout layout = new LinearLayout(this);
        layout.setOrientation(LinearLayout.VERTICAL);

// Create a banner ad. The ad size and ad unit ID must be set before calling loadAd.
        mAdView = new AdView(this);
        mAdView.setAdSize(AdSize.SMART_BANNER);
        mAdView.setAdUnitId(ad_unit_id);

// Create an ad request.
        AdRequest.Builder adRequestBuilder = new AdRequest.Builder();



// Add the AdView to the view hierarchy.
        layout.addView(mAdView);

// Start loading the ad.
        mAdView.loadAd(adRequestBuilder.build());

// Show Ads
        addContentView(layout, new LayoutParams(LayoutParams.MATCH_PARENT, LayoutParams.MATCH_PARENT));
    }
    @Override
    public void onResume() {
        super.onResume();

        // Resume the AdView.
        mAdView.resume();
    }

    @Override
    public void onPause() {
        // Pause the AdView.
        mAdView.pause();

        super.onPause();
    }

    @Override
    public void onDestroy() {
        // Destroy the AdView.
        mAdView.destroy();

        super.onDestroy();
    }
}