[英]Hide linearlayout on webview scroll
我有一個應用程序屏幕,其中有一個 web 視圖,以及屏幕底部按鈕的線性布局。 我有一個附加到 webview 的滾動偵聽器,它在滾動時給我值。 我真正想做的是在向下滾動時逐漸隱藏底部線性布局,並在向上滾動時顯示,正如在少數應用程序中看到的那樣,但我能看到的所有示例都是屏幕頂部的工具欄。
我嘗試了很多東西,我嘗試獲取線性布局的高度,然后在滾動時,將其在 y 軸上移動以隱藏和顯示,這將移動按鈕內的按鈕而不是實際的欄。
我嘗試的主要事情是滾動時,降低欄的高度,當它達到 0 時隱藏它,然后再次顯示它,但這是擠壓按鈕而不是將它們從屏幕底部滾動而不改變它們的大小.
這是布局:
<LinearLayout
android:orientation="horizontal"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_alignParentBottom="true"
android:id="@+id/buttonBar"
android:background="#403152"
android:visibility="gone"
android:layout_marginTop="5dp"
android:layout_marginBottom="5dp">
<ImageButton
android:layout_width="wrap_content"
android:layout_height="match_parent"
android:id="@+id/facebookLink"
android:src="@string/button1"
android:layout_weight="1"
android:onClick="openLink"
android:background="@android:color/transparent"/>
<ImageButton
android:layout_width="wrap_content"
android:layout_height="match_parent"
android:id="@+id/linkedinLink"
android:src="@string/button2"
android:layout_weight="1"
android:background="?android:selectableItemBackground"
android:onClick="openLink"/>
<ImageButton
android:layout_width="wrap_content"
android:layout_height="match_parent"
android:id="@+id/twitterLink"
android:src="@string/button3"
android:layout_weight="1"
android:background="?android:selectableItemBackground"
android:onClick="openLink"/>
<ImageButton
android:layout_width="wrap_content"
android:layout_height="match_parent"
android:id="@+id/instagramLink"
android:src="@string/button4"
android:layout_weight="1"
android:background="?android:selectableItemBackground"
android:onClick="openLink"/>
<ImageButton
android:layout_width="wrap_content"
android:layout_height="match_parent"
android:src="@mipmap/ic_overflow"
android:layout_weight="1"
android:layout_gravity="center"
android:background="?android:selectableItemBackground"
android:onClick="showPopup"
android:id="@+id/aboutoption"/>
</LinearLayout>
<holidays.ObservableWebView
android:id="@+id/scrollableWebview"
android:layout_width="fill_parent"
android:clickable="false"
android:layout_height="fill_parent"
android:layout_alignParentTop="true"
android:layout_above="@id/buttonBar"
android:visibility="gone"/>
然后這是我迄今為止嘗試過的代碼,其中包括更改高度等 - 希望有人能夠指出我做錯的正確方向,或者可能是解決此問題的更好方法。
mWebView.setOnScrollChangedCallback(new ObservableWebView.OnScrollChangedCallback(){
public void onScroll(int l, int t){
int height = mWebView.getMeasuredHeight();
Log.d("HEIGHT", Integer.toString(height));
Display display = getWindowManager().getDefaultDisplay();
Point size = new Point();
display.getSize(size);
int screenHeight = size.y;
Log.d("Screen HEIGHT", Integer.toString(screenHeight));
LinearLayout layout = (LinearLayout)findViewById(R.id.buttonBar);
View contentsView = findViewById(R.id.buttonBar);
if(firstScroll == true){
mWebView.setLayoutParams(new RelativeLayout.LayoutParams(mWebView.getMeasuredWidth(), mWebView.getMeasuredHeight() + 10));
/*originalButtonBarHeight = findViewById(R.id.buttonBar).getHeight();
currentButtonBarHeight = originalButtonBarHeight;
contentsView.getLocationOnScreen(screenBarPosition);
contentsView.setY(screenBarPosition[1] + 1);
firstScroll = false;
layout.getLayoutParams().height = t + 1;
layout.requestLayout();
directionVal = t;*/
}
else if(firstScroll == false){
if(directionVal < t){
mWebView.setLayoutParams(new RelativeLayout.LayoutParams(mWebView.getMeasuredWidth(), mWebView.getMeasuredHeight() + 10));
/* Log.d("DOWN", Integer.toString(t));
if(currentButtonBarHeight <= 0){
//do nothing
}
else{
currentButtonBarHeight = currentButtonBarHeight - 5;
if(currentButtonBarHeight <= 0){
currentButtonBarHeight = 0;
layout.getLayoutParams().height = 0;
layout.requestLayout();
findViewById(R.id.buttonBar).setVisibility(View.GONE);
}
else{
contentsView.getLocationOnScreen(screenBarPosition);
contentsView.setY(screenBarPosition[1] + 1);
layout.getLayoutParams().height = currentButtonBarHeight;
layout.requestLayout();
}
}
/*if(t + 5 < originalButtonBarHeight) {
}*/
}
else if(directionVal > t){
Log.d("UP", Integer.toString(currentButtonBarHeight));
/*decreasedAmount = t - 5;
if (decreasedAmount < originalButtonBarHeight){
layout.getLayoutParams().height = t - 5;
layout.requestLayout();
}*/
}
directionVal = t;
}
}
});
您可以通過CustomWebView
執行此操作:
自定義WebView.java :
public class CustomWebView extends WebView {
private GestureDetector gestureDetector;
public CustomWebView(Context context) {
super(context);
}
public CustomWebView(Context context, AttributeSet attrs) {
super(context, attrs);
}
public CustomWebView(Context context, AttributeSet attrs, int defStyle) {
super(context, attrs, defStyle);
}
@Override
protected void onScrollChanged(int l, int t, int oldl, int oldt) {
super.onScrollChanged(l, t, oldl, oldt);
}
@Override
public boolean onTouchEvent(MotionEvent ev) {
return gestureDetector.onTouchEvent(ev) || super.onTouchEvent(ev);
}
public void setGestureDetector(GestureDetector gestureDetector) {
this.gestureDetector = gestureDetector;
}
}
web_fragment.xml :
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:app="http://schemas.android.com/apk/res-auto"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:background="@android:color/transparent"
android:orientation="vertical">
<com.customview.CustomWebView
android:id="@+id/customWebView"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:focusable="true" />
// Your other Linear layout
</LinearLayout>
用於手勢檢測的CustomeGestureDetector clss(我已在 Fragment 中添加):
private class CustomeGestureDetector extends GestureDetector.SimpleOnGestureListener {
@Override
public boolean onFling(MotionEvent e1, MotionEvent e2, float velocityX, float velocityY) {
if(e1 == null || e2 == null) return false;
if(e1.getPointerCount() > 1 || e2.getPointerCount() > 1) return false;
else {
try {
if(e1.getY() - e2.getY() > 20 ) {
// Show Your Linear Layout
customWebView.invalidate();
return false;
}
else if (e2.getY() - e1.getY() > 20 ) {
// Hide Your Linear Layout
customWebView.invalidate();
return false;
}
} catch (Exception e) {
customWebView.invalidate();
}
return false;
}
}
}
WebFragment.java :
private CustomWebView customWebView;
customWebView= (CustomWebView) view.findViewById(R.id.customWebView);
customWebView.setGestureDetector(new GestureDetector(new CustomeGestureDetector()));
希望它會幫助你。
將您的根view
設為CoordinatorLayout
。
將您的內容包裝到NestedScrollView
。
將以下內容添加到您的底部View
:
app:layout_behavior="com.google.android.material.behavior.HideBottomViewOnScrollBehavior">
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