Handle screen rotation

            android:name="com.android.gallery3d.filtershow.FilterShowActivity"

            android:label="@string/title_activity_filter_show"

            android:theme="@style/Theme.Gallery"

             android:screenOrientation="portrait">

            android:configChanges="keyboardHidden|orientation|screenSize">

            <intent-filter>

                <action android:name="android.intent.action.EDIT" />

                <category android:name="android.intent.category.DEFAULT" />

            float h = w / ratio;

            float ty = (getHeight() - h) / 2.0f;

            float tx = 0;

            if (ratio < 1.0f) { // portrait image

            if (ratio < 1.0f || (getHeight() < w)) {

                h = getHeight();

                w = h * ratio;

                tx = (getWidth() - w) / 2.0f;