在 Viewpager 中滾動 Webview

Question

我在WebView中有一個ViewPager 。 並且ViewPager似乎消耗了所有水平滾動，因此我無法在WebView （垂直作品）中滾動。

如何實現WebView優先使用水平滾動？

Answer 1

不要問我為什么這個代碼被格式化為這樣，

1.實現一個自定義ViewPager實例，如下所示：

import android.content.Context;
import android.support.v4.view.ViewPager;
import android.util.AttributeSet;
import android.util.Log;
import android.view.MotionEvent;

public class CustomViewPager extends ViewPager {

    private MagazineWebView_WithoutFlipWebView mCurrentPageWebView_; //custom webview

    public CustomViewPager(Context context, AttributeSet attrs) {
        super(context, attrs);
    }

    @Override
    public boolean onInterceptTouchEvent(MotionEvent event) {

        if (Constants.LOGGING) {
            Log.v(Constants.LOG_OEAMTC_APP, "CustomViewPager - onInterceptTouchEvent");
        }

        // if view zoomed out (view starts at 33.12... scale level) ... allow
        // zoom within webview, otherwise disallow (allow viewpager to change
        // view)
        if (mCurrentPageWebView_ != null && (mCurrentPageWebView_.getScale() * 100) > 34) {
            Log.v(Constants.LOG_OEAMTC_APP, "CustomViewPager - intrcepted: " + String.valueOf((mCurrentPageWebView_.getScale() * > 100)));
            this.requestDisallowInterceptTouchEvent(true);
        }
        else {
            if (mCurrentPageWebView_ != null) {
                Log.v(Constants.LOG_OEAMTC_APP,
                        "CustomViewPager - not intrcepted: " + String.valueOf(mCurrentPageWebView_.getScale() * 100));
            }
            this.requestDisallowInterceptTouchEvent(false);
        }

        return super.onInterceptTouchEvent(event);
    }

    public MagazineWebView_WithoutFlipWebView getCurrentPageWebView() {
        return mCurrentPageWebView_;
    }

    public void setCurrentPageWebView(MagazineWebView_WithoutFlipWebView currentPageWebView) {
        mCurrentPageWebView_ = currentPageWebView;
    }
}

2.在您的主（ViewPager）活動中，將以下行添加到視圖尋呼機

mViewPager_ = new AwesomePagerAdapter();
        viewpapgerInLayout = (CustomViewPager) findViewById(R.id.awesomepager);
        viewpapgerInLayout.setAdapter(mViewPager_);
        viewpapgerInLayout.setOnPageChangeListener(new ViewPager.OnPageChangeListener() {
            @Override
            public void onPageSelected(int position) {
                  viewpapgerInLayout.setCurrentPageWebView(mLstPagesWebviews_.get(position));
            }

            @Override
            public void onPageScrolled(int position, float positionOffset, int positionOffsetPixels) {

            }

            @Override
            public void onPageScrollStateChanged(int state) {

            }
        });

3.最后，運行它：=）如果縮放級別是初始縮放，則允許更改頁面，所有其他時間您可以瀏覽Web視圖

PS：* 不要忘記 *更改ViewPager與剛創建的CustomViewPager類的* .xml文件

祝好運 ：）

Answer 2

試試這個

WebView mWebView = (WebView) findViewById(R.id.MyWebview);
mWebView.getSettings().setLoadWithOverviewMode(true);
mWebView.getSettings().setUseWideViewPort(true);
mWebView.getSettings().setSupportZoom(true);
mWebView.getSettings().setBuiltInZoomControls(true);
mWebView.getSettings().setUserAgentString("Mozilla/5.0 (iPhone; U; CPU like Mac OS X; en) AppleWebKit/420+ (KHTML, like Gecko) Version/3.0 Mobile/1A543a Safari/419.3");

Answer 3

這個問題晚了，我想出了一種不同的方法來解決這個問題，方法是override WebView onTouchEvent方法。 它適用於ViewPager和ViewPager2 。 希望這會對未來有所幫助。

注意：用WebView替換你的NestedScrollWebView

import android.content.Context
import android.util.AttributeSet
import android.view.MotionEvent
import android.webkit.WebView
import androidx.core.view.NestedScrollingChild
import androidx.core.view.NestedScrollingChildHelper
import androidx.core.view.ViewCompat

class NestedScrollWebView : WebView, NestedScrollingChild {

    companion object {
        val TAG: String = NestedScrollWebView::class.java.simpleName
    }

    private var lastMotionX: Int = 0
    private var lastMotionY: Int = 0

    private val scrollOffset = IntArray(2)
    private val scrollConsumed = IntArray(2)

    private var nestedOffsetY: Int = 0

    private var childHelper = NestedScrollingChildHelper(this)

    constructor(context: Context) : super(context) {
        init()
    }

    constructor(context: Context, attrs: AttributeSet) : super(context, attrs) {
        init()
    }

    constructor(context: Context, attrs: AttributeSet, defStyleAttr: Int) : super(context, attrs, defStyleAttr) {
        init()
    }

    private fun init() {
        isNestedScrollingEnabled = true
    }

    override fun onTouchEvent(event: MotionEvent): Boolean {
        var result = false

        val trackedEvent = MotionEvent.obtain(event)

        val action = event.actionMasked

        if (action == MotionEvent.ACTION_DOWN) {
            nestedOffsetY = 0
        }

        val x = event.x.toInt()
        val y = event.y.toInt()

        event.offsetLocation(0f, nestedOffsetY.toFloat())

        when (action) {
            MotionEvent.ACTION_DOWN -> {
                lastMotionX = x
                lastMotionY = y
                startNestedScroll(ViewCompat.SCROLL_AXIS_VERTICAL)
                result = super.onTouchEvent(event)
            }
            MotionEvent.ACTION_MOVE -> {
                var deltaY = lastMotionY - y

                if (kotlin.math.abs(deltaY) > kotlin.math.abs(lastMotionX - x) &&
                    (canScrollVertically(1) || canScrollVertically(-1))
                ) {
                    requestDisallowInterceptTouchEvent(true)
                }

                if (dispatchNestedPreScroll(0, deltaY, scrollConsumed, scrollOffset)) {
                    deltaY -= scrollConsumed[1]
                    trackedEvent.offsetLocation(0f, scrollOffset[1].toFloat())
                    nestedOffsetY += scrollOffset[1]
                }

                lastMotionY = y - scrollOffset[1]

                val oldY = scrollY
                val newScrollY = Math.max(0, oldY + deltaY)
                val dyConsumed = newScrollY - oldY
                val dyUnconsumed = deltaY - dyConsumed

                if (dispatchNestedScroll(0, dyConsumed, 0, dyUnconsumed, scrollOffset)) {
                    lastMotionY -= scrollOffset[1]
                    trackedEvent.offsetLocation(0f, scrollOffset[1].toFloat())
                    nestedOffsetY += scrollOffset[1]
                }

                result = super.onTouchEvent(trackedEvent)
                trackedEvent.recycle()
            }
            MotionEvent.ACTION_POINTER_DOWN, MotionEvent.ACTION_UP, MotionEvent.ACTION_CANCEL -> {
                stopNestedScroll()
                requestDisallowInterceptTouchEvent(false)
                result = super.onTouchEvent(event)
            }
        }
        return result
    }

    // NestedScrollingChild

    override fun setNestedScrollingEnabled(enabled: Boolean) {
        childHelper.isNestedScrollingEnabled = enabled
    }

    override fun stopNestedScroll() {
        childHelper.stopNestedScroll()
    }

    override fun isNestedScrollingEnabled() =
        childHelper.isNestedScrollingEnabled

    override fun startNestedScroll(axes: Int) =
        childHelper.startNestedScroll(axes)

    override fun hasNestedScrollingParent() =
        childHelper.hasNestedScrollingParent()

    override fun dispatchNestedScroll(dxConsumed: Int, dyConsumed: Int, dxUnconsumed: Int, dyUnconsumed: Int, offsetInWindow: IntArray?) =
        childHelper.dispatchNestedScroll(dxConsumed, dyConsumed, dxUnconsumed, dyUnconsumed, offsetInWindow)

    override fun dispatchNestedPreScroll(dx: Int, dy: Int, consumed: IntArray?, offsetInWindow: IntArray?) =
        childHelper.dispatchNestedPreScroll(dx, dy, consumed, offsetInWindow)

    override fun dispatchNestedFling(velocityX: Float, velocityY: Float, consumed: Boolean) =
        childHelper.dispatchNestedFling(velocityX, velocityY, consumed)

    override fun dispatchNestedPreFling(velocityX: Float, velocityY: Float) =
        childHelper.dispatchNestedPreFling(velocityX, velocityY)

}