Back button behavior with tabs and ActivityGroup

跟風遠走 提交于 2019-12-02 08:20:21

Override public void onBackPressed() in your activity and handle the back button click yourself. Calling super.onBackPressed(); will affect the standard behaviour of back button press (also exit your app)

So I found the answer.

I have an admob adview in my Main, which seems the cause of this problem. This is the xml:

    <?xml version="1.0" encoding="utf-8"?>
    <TabHost
        xmlns:android="http://schemas.android.com/apk/res/android"
        xmlns:ads="http://schemas.android.com/apk/lib/com.google.ads"
        android:id="@android:id/tabhost"
        android:layout_width="fill_parent"
        android:layout_height="fill_parent">
        <RelativeLayout
            android:layout_width="fill_parent"
            android:layout_height="fill_parent"    
                    android:padding="0dp">
        <TabWidget
            android:id="@android:id/tabs"
            android:layout_width="fill_parent"
            android:layout_height="wrap_content"
            android:layout_alignParentTop="true" />
        <com.google.ads.AdView
            android:id="@+id/adView"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            ads:adUnitId="@string/adkey"
            ads:adSize="BANNER"
            ads:loadAdOnCreate="false"
            android:layout_alignParentBottom="true" 
            android:focusable="false"/>
        <FrameLayout
            android:id="@android:id/tabcontent"
            android:layout_width="fill_parent"
            android:layout_height="fill_parent"
            android:layout_above="@id/adView"
            android:layout_below="@android:id/tabs" />

    </RelativeLayout>
</TabHost>

When I remove the adview, the problem doesn't occur.

Now to solve this, I've changed the xml into this:

<?xml version="1.0" encoding="utf-8"?>
<TabHost
    xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:ads="http://schemas.android.com/apk/lib/com.google.ads"
    android:id="@android:id/tabhost"
    android:layout_width="fill_parent"
    android:layout_height="fill_parent">
    <FrameLayout
        android:layout_width="fill_parent"
        android:layout_height="fill_parent">
        <RelativeLayout
            android:layout_width="fill_parent"
            android:layout_height="fill_parent"
            android:padding="0dp">
            <TabWidget
                android:id="@android:id/tabs"
                android:layout_width="fill_parent"
                android:layout_height="wrap_content"
                android:layout_alignParentTop="true" />

            <FrameLayout
                android:id="@android:id/tabcontent"
                android:layout_width="fill_parent"
                android:layout_height="fill_parent"
                android:layout_below="@android:id/tabs" />
        </RelativeLayout>
        <RelativeLayout
            android:layout_width="fill_parent"
            android:layout_height="wrap_content">
            <com.google.ads.AdView
                android:id="@+id/adView"
                android:layout_width="wrap_content"
                android:layout_height="wrap_content"
                ads:adUnitId="@string/adkey"
                ads:adSize="BANNER"
                ads:loadAdOnCreate="false"
                android:layout_alignParentBottom="true"
                android:focusable="false" />
        </RelativeLayout>
    </FrameLayout>
</TabHost>
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