[英]How can I remove white space on bottom of webview when i use webview in swiprefreshlayout and nestedscrollview?
我正在研究WebView項目,我想將WebView與SwipRefreshLayout一起使用,並且為了滾動Webview,我必須將WebView放在NestedScrollView中,但是WebView在html內容中添加帶有邊框的不需要的空格,而當我設置setJavaScriptEnabled時(false),WebView正常工作。 我已嘗試過網絡上的所有解決方案,但我無法解決。
activity_main
<?xml version="1.0" encoding="utf-8"?><!--xmlns:ads="http://schemas.android.com/apk/res-auto"-->
<android.support.v4.widget.DrawerLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:app="http://schemas.android.com/apk/res-auto"
android:id="@+id/drawer_id"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:fitsSystemWindows="true">
<android.support.design.widget.CoordinatorLayout
android:id="@+id/main_content"
android:layout_width="match_parent"
android:layout_height="match_parent">
<android.support.design.widget.AppBarLayout
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:theme="@style/ThemeOverlay.AppCompat.Dark.ActionBar">
<android.support.v7.widget.Toolbar
android:id="@+id/toolbar_id"
android:layout_width="match_parent"
android:layout_height="?attr/actionBarSize"
android:background="@color/colorPrimary"
app:popupTheme="@style/PopupTheme"
android:fitsSystemWindows="true"
android:theme="@style/ToolbarTheme"
app:subtitleTextAppearance="@style/Toolbar.SubTitleText"
app:title="Toolbar"
app:titleTextAppearance="@style/Toolbar.TitleText"
app:titleTextColor="#ffffff"
app:layout_scrollFlags="scroll|enterAlways"
/>
</android.support.design.widget.AppBarLayout>
<RelativeLayout
android:id="@+id/refresh_container"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:visibility="gone"
>
<ImageView
android:id="@+id/refreshIV"
android:layout_width="36dp"
android:layout_height="36dp"
android:layout_centerInParent="true"
android:src="@drawable/refresh_button"
/>
</RelativeLayout>
<android.support.v4.widget.SwipeRefreshLayout
android:id="@+id/swiperefresh"
android:layout_width="match_parent"
android:layout_height="match_parent"
app:layout_behavior="@string/appbar_scrolling_view_behavior"
>
<android.support.v4.widget.NestedScrollView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:fillViewport="true"
>
<FrameLayout
android:layout_width="match_parent"
android:layout_height="match_parent"
>
<!-->-->
<FrameLayout
android:id="@+id/progressbar_container"
android:layout_width="match_parent"
android:layout_height="4dp">
<ProgressBar
android:id="@+id/progressbar_id"
style="@style/Widget.AppCompat.ProgressBar.Horizontal"
android:layout_width="match_parent"
android:layout_height="8dp"
android:scaleY="2"
android:progressDrawable="@drawable/progresscolor"
android:max="100" />
</FrameLayout>
<FrameLayout
android:id="@+id/refresh_page_container"
android:layout_width="match_parent"
android:layout_height="?attr/actionBarSize"
android:background="#f2f2f2"
android:visibility="gone"
>
<ImageView
android:id="@+id/refresh_btn_iv"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:src="@drawable/ic_refresh"
android:layout_gravity="center"
/>
</FrameLayout>
<FrameLayout
android:id="@+id/webview_view"
android:layout_width="match_parent"
android:layout_height="match_parent"
>
<WebView
android:id="@+id/main_webView"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:fitsSystemWindows="true"
/>
</FrameLayout>
<FrameLayout
android:id="@+id/target_view"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:visibility="gone">
</FrameLayout>
</FrameLayout>
</android.support.v4.widget.NestedScrollView>
</android.support.v4.widget.SwipeRefreshLayout>
<com.google.android.gms.ads.AdView xmlns:ads="http://schemas.android.com/apk/res-auto"
android:id="@+id/adView"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_gravity="bottom"
android:visibility="gone"
ads:adSize="BANNER"
ads:adUnitId="@string/test_unit_id" />
<!--</FrameLayout>-->
</android.support.design.widget.CoordinatorLayout>
<android.support.design.widget.NavigationView
android:id="@+id/navigation_id"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:layout_gravity="start"
app:headerLayout="@layout/toolbar_header"
app:menu="@menu/navigation_menu" />
</android.support.v4.widget.DrawerLayout>
經過幾天的研究,我找到了解決方案。
在這種情況下,我們可以從布局中刪除NestedScrollView
並使用OnScrollChangeListener
來控制WebView的滾動。 當然,自API 23+以來我們可以直接使用它,但對於API <23,我們的行為如下:
ObservableWebView
import android.content.Context;
import android.util.AttributeSet;
import android.webkit.WebView;
public class ObservableWebView extends WebView {
private OnScrollChangedCallback mOnScrollChangedCallback;
public ObservableWebView(final Context context)
{
super(context);
}
public ObservableWebView(final Context context, final AttributeSet attrs)
{
super(context, attrs);
}
public ObservableWebView(final Context context, final AttributeSet attrs, final int defStyle)
{
super(context, attrs, defStyle);
}
@Override
protected void onScrollChanged(final int l, final int t, final int oldl, final int oldt)
{
super.onScrollChanged(l, t, oldl, oldt);
if(mOnScrollChangedCallback != null) mOnScrollChangedCallback.onScroll(l, t, oldl, oldt);
}
public OnScrollChangedCallback getOnScrollChangedCallback()
{
return mOnScrollChangedCallback;
}
public void setOnScrollChangedCallback(final OnScrollChangedCallback onScrollChangedCallback)
{
mOnScrollChangedCallback = onScrollChangedCallback;
}
/**
* Implement in the activity/fragment/view that you want to listen to the webview
*/
public static interface OnScrollChangedCallback
{
public void onScroll(int l, int t, int oldl, int oldt);
}
}
並且您需要實現OnScrollChangedCallback接口,然后檢查webview的scrollY位置以啟用或禁用swiperefresh:
ObservableWebView webView= findViewById(R.id.main_webView);
/**
*
* @param l Current horizontal scroll position.
* @param t Current vertical scroll position.
* @param oldl Previous horizontal scroll position.
* @param oldt Previous vertical scroll position.
*/
webView.setOnScrollChangedCallback(new OnScrollChangedCallback(){
public void onScroll(int l, int t, int oldl, int oldt){
if (t == 0) {
swiperefresh.setEnabled(true);
} else {
swiperefresh.setEnabled(false);
}
}
});
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