我正在使用自定义视图传呼机将多个图像显示为滑块。它可以正常工作,但会在加载Webview内容(Webview内容为空)之前加载图像大约一秒钟,然后在布局中移至下方。如何避免在空的Webview内容中加载图片?我已经搜索了stackoverflow,但是找不到合适的答案。
主要布局
<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="match_parent"
android:layout_height="match_parent"
xmlns:app="http://schemas.android.com/apk/res-auto"
android:clickable="true">
<include
android:id="@+id/newsPageToolbar"
layout="@layout/toolbar" />
<ScrollView
android:layout_width="match_parent"
android:layout_height="match_parent"
android:layout_below="@id/newsPageToolbar"
android:background="@android:color/white"
android:fillViewport="true"
android:fitsSystemWindows="true"
android:scrollbarStyle="insideInset"
android:scrollbars="vertical">
<LinearLayout
android:layout_width="match_parent"
android:layout_height="match_parent"
android:orientation="vertical">
<TextView
android:id="@+id/newsTitleSinglePage"
style="@style/Base.TextAppearance.AppCompat.Body2"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:includeFontPadding="false"
android:paddingBottom="0dp"
android:paddingLeft="8dp"
android:paddingRight="8dp"
android:paddingTop="15dp"
android:textSize="24sp" />
<TextView
android:id="@+id/publishDateSinglePage"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:paddingBottom="10dp"
android:paddingLeft="8dp"
android:paddingRight="8dp"
android:paddingTop="5dp"
android:textSize="14sp" />
<ImageView
android:id="@+id/imageSinglePage"
android:layout_width="match_parent"
android:layout_height="230dp"
android:adjustViewBounds="true"
android:paddingLeft="8dp"
android:paddingRight="8dp"
android:scaleType="centerCrop" />
<TextView
android:id="@+id/newsSourceSinglePage"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:paddingBottom="10dp"
android:paddingLeft="8dp"
android:paddingRight="8dp"
android:paddingTop="2dp"
android:textSize="14sp" />
<WebView
android:id="@+id/newsBody"
android:layout_width="wrap_content"
android:layout_height="wrap_content"></WebView>
<WebView
android:id="@+id/videoView"
android:layout_width="wrap_content"
android:layout_height="wrap_content"></WebView>
<RelativeLayout
android:layout_width="match_parent"
android:layout_height="wrap_content">
<com.eastnews.huseyn.eastnews.WrapContentViewPager
android:id="@+id/imagePager"
android:layout_width="match_parent"
android:layout_height="wrap_content"
app:layout_behavior="@string/appbar_scrolling_view_behavior"/>
<me.relex.circleindicator.CircleIndicator
android:id="@+id/imageIndicator"
android:layout_width="match_parent"
android:layout_height="48dp"
android:layout_alignParentBottom="true"/>
</RelativeLayout>
<TextView
android:id="@+id/newsLink"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:paddingBottom="10dp"
android:paddingLeft="10dp"
android:paddingRight="10dp"
android:paddingTop="5dp"
android:text="@string/link" />
</LinearLayout>
</ScrollView>
</RelativeLayout>
图像布局
<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="match_parent" android:layout_height="match_parent">
<ImageView
android:id="@+id/imageSlider"
android:layout_width="match_parent"
android:layout_height="230dp"
android:adjustViewBounds="true"
android:paddingLeft="8dp"
android:paddingRight="8dp"
android:scaleType="centerCrop" />
</RelativeLayout>
ViewPagerAdapter类的onMeasure方法
protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) {
super.onMeasure(widthMeasureSpec, heightMeasureSpec);
boolean wrapHeight = MeasureSpec.getMode(heightMeasureSpec) == MeasureSpec.UNSPECIFIED;
if(wrapHeight) {
int width = getMeasuredWidth();
int height = getMeasuredHeight();
widthMeasureSpec = MeasureSpec.makeMeasureSpec(width,MeasureSpec.EXACTLY);
if(getChildCount() > 0) {
View firstChild = getChildAt(0);
firstChild.measure(widthMeasureSpec,MeasureSpec.makeMeasureSpec(height,MeasureSpec.UNSPECIFIED));
height = firstChild.getMeasuredHeight();
}
heightMeasureSpec = MeasureSpec.makeMeasureSpec(height,MeasureSpec.EXACTLY);
super.onMeasure(widthMeasureSpec,heightMeasureSpec);
}
}
答案 0 :(得分:0)
我已经解决了使用可见性消失的问题。首先,将可见性设置在布局xml中。然后使用webview onPageFinished(WebView view, String url){...}
函数使视图可见。