我有水平滚动视图的问题。
这是我的 XML 代码：
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
android:id="@+id/relative_layout_id"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:background="@drawable/bg"
tools:context=".MainActivity" >
<TextView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:id="@+id/home_title_id"
android:text="@string/home_title"
android:layout_marginTop="@dimen/forty_text_size"
android:textColor="@android:color/white"
android:layout_centerHorizontal="true"
android:gravity="center"
android:textSize="@dimen/forty_text_size" />
<LinearLayout
android:id="@+id/linear_layout_id"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_below="@id/home_title_id">
<HorizontalScrollView
android:id="@+id/horizontal_view_id"
android:layout_width="wrap_content"
android:layout_height="wrap_content" >
<ImageView
android:id="@+id/home_image_id"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:src="@drawable/abc" />
</HorizontalScrollView>
</LinearLayout>
</RelativeLayout>
在我的 Java 类中，扩展活动我已经声明了所有小部件，然后我创建了一个类滚动视图，扩展了水平滚动视图。
Java代码如下：
class scrollview extends HorizontalScrollView
{
private static final int SWIPE_MIN_DISTANCE = 5;
private static final int SWIPE_THRESHOLD_VELOCITY = 300;
private ArrayList mItems = null;
private GestureDetector mGestureDetector;
private int mActiveFeature = 0;
public scrollview(Context context)
{
super(context);
}
public void setFeatureItems(ArrayList items)
{
LinearLayout internalWrapper = new LinearLayout(getContext());
internalWrapper.setLayoutParams(new LayoutParams(LayoutParams.FILL_PARENT, LayoutParams.FILL_PARENT));
internalWrapper.setOrientation(LinearLayout.HORIZONTAL);
addView(internalWrapper);
this.mItems = items;
for(int i = 0; i< items.size();i++)
{
LinearLayout featureLayout = (LinearLayout) View.inflate(this.getContext(),R.layout.activity_main,null);
//...
//Create the view for each screen in the scroll view
//...
internalWrapper.addView(featureLayout);
}
setOnTouchListener(new View.OnTouchListener()
{
@Override
public boolean onTouch(View v, MotionEvent event)
{
//If the user swipes
if (mGestureDetector.onTouchEvent(event))
{
return true;
}
else if(event.getAction() == MotionEvent.ACTION_UP || event.getAction() == MotionEvent.ACTION_CANCEL )
{
int scrollX = getScrollX();
int featureWidth = v.getMeasuredWidth();
mActiveFeature = ((scrollX + (featureWidth/2))/featureWidth);
int scrollTo = mActiveFeature*featureWidth;
smoothScrollTo(scrollTo, 0);
return true;
}
else
{
return false;
}
}
});
mGestureDetector = new GestureDetector(new MyGestureDetector());
}
class MyGestureDetector extends SimpleOnGestureListener
{
@Override
public boolean onFling(MotionEvent e1, MotionEvent e2, float velocityX, float velocityY)
{
try
{
//right to left
if(e1.getX() - e2.getX() > SWIPE_MIN_DISTANCE && Math.abs(velocityX) > SWIPE_THRESHOLD_VELOCITY)
{
int featureWidth = getMeasuredWidth();
mActiveFeature = (mActiveFeature < (mItems.size() - 1))? mActiveFeature + 1:mItems.size() -1;
smoothScrollTo(mActiveFeature*featureWidth, 0);
return true;
}
//left to right
else if (e2.getX() - e1.getX() > SWIPE_MIN_DISTANCE && Math.abs(velocityX) > SWIPE_THRESHOLD_VELOCITY)
{
int featureWidth = getMeasuredWidth();
mActiveFeature = (mActiveFeature > 0)? mActiveFeature - 1:0;
smoothScrollTo(mActiveFeature*featureWidth, 0);
return true;
}
} catch (Exception e) {
Log.e("Fling", "There was an error processing the Fling event:" + e.getMessage());
}
return false;
}
}
}
但是什么也没发生，请帮忙。
或者在 ONTOUCH 列表器功能中有滚动类会更好吗？？？