Android WebView使用setWideViewPort，禁用双击缩放但保持缩放？

Question

我正在使用此代码，它的工作原理与我想要的完全一样。但我必须在双击上实现另一个功能，并希望禁用双击缩放（但保留缩放缩放功能）。

webView.getSettings().setLoadWithOverviewMode(true); 
webView.getSettings().setUseWideViewPort(true); 
webView.getSettings().setLayoutAlgorithm(LayoutAlgorithm.NORMAL); 
webView.getSettings().setBuiltInZoomControls(true); 
webView.getSettings().setSupportZoom(true); 
webView.setInitialScale(1); 

试图手动计算比例，没有运气（这感觉很复杂）。 Disable Double Tap Zoom/Unzoom on a webview

Android Webview - Webpage should fit the device screen

是否有使用setUseWideViewPort和Zoomcontrolls但只有禁用或覆盖到双击缩放的方式？

Answer 1

最佳的解决方案，刚刚从MyWebView

public class HelpWebView extends WebView { 

    private GestureDetector gestureDetector; 
    private AtomicBoolean mPreventAction = new AtomicBoolean(false); 
    private AtomicLong mPreventActionTime = new AtomicLong(0); 

    public HelpWebView(Context context) { 
     super(context); 
     gestureDetector = new GestureDetector(context, new GestureListener()); 
    } 

    public HelpWebView(Context context, AttributeSet attrs) { 
     super(context, attrs); 
     gestureDetector = new GestureDetector(context, new GestureListener()); 
    } 

    public HelpWebView(Context context, AttributeSet attrs, int defStyle) { 
     super(context, attrs, defStyle); 
     gestureDetector = new GestureDetector(context, new GestureListener()); 
    } 

    public HelpWebView(Context context, AttributeSet attrs, int defStyle, boolean privateBrowsing) { 
     super(context, attrs, defStyle, privateBrowsing); 
     gestureDetector = new GestureDetector(context, new GestureListener()); 
    } 

    @Override 
    public boolean onTouchEvent(MotionEvent event) { 
     int index = (event.getAction() & MotionEvent.ACTION_POINTER_INDEX_MASK) >> MotionEvent.ACTION_POINTER_INDEX_SHIFT; 
     int pointId = event.getPointerId(index); 

     // just use one(first) finger, prevent double tap with two and more fingers 
     if (pointId == 0){ 
      gestureDetector.onTouchEvent(event); 

      if (mPreventAction.get()){ 
       if (System.currentTimeMillis() - mPreventActionTime.get() > ViewConfiguration.getDoubleTapTimeout()){ 
        mPreventAction.set(false); 
       } else { 
        return true; 
       } 
      } 

      return super.onTouchEvent(event); 
     } else { 
      return true; 
     } 
    } 

    private class GestureListener extends GestureDetector.SimpleOnGestureListener { 
     @Override 
     public boolean onDoubleTap(MotionEvent e) { 
      mPreventAction.set(true); 
      mPreventActionTime.set(System.currentTimeMillis()); 
      return true; 
     } 
     @Override 
     public boolean onDoubleTapEvent(MotionEvent e) { 
      mPreventAction.set(true); 
      mPreventActionTime.set(System.currentTimeMillis()); 
      return true; 
     } 
    } 
} 

扩展您的WebView

Answer 2

对不起，我没有时间来测试这一点，但尝试：

GestureDetector.SimpleOnGestureListener sogl = new GestureDetector.SimpleOnGestureListener() { 
    public boolean onDoubleTap(MotionEvent e) { 
     showToast("Double tap"); 
     return true; //instead of false 
    } 
} 

Answer 3

找到了解决办法：

class MyWebView extends WebView { 

    public boolean onTouchEvent(MotionEvent event) { 

      gd.onTouchEvent(event); 

      // disable double tap zooming 

     if(doubleTap) 
      { 
       doubleTap = false; 
       return false; 
      } 

      return super.onTouchEvent(event); 
     } 


    GestureDetector.SimpleOnGestureListener sogl = new GestureDetector.SimpleOnGestureListener() { 




      public boolean onDoubleTap(MotionEvent e) { 

        showToast("Double tap"); 
        doubleTap = true; 

        return false; 
      }   
} 

Answer 4

带有“一根（第一根）手指”解决方案的手势检测器无法可靠工作。 Galaxy S3 Android 4.0.4上的网页视图有时会缩小。当放大视图时，可以使用像这样的附加WebViewClient恢复缩放比例：

public class NoZoomedWebViewClient extends WebViewClient { 
    private static final String LOG_TAG = "NoZoomedWebViewClient"; 
    private static final long STABLE_SCALE_CALCULATION_DURATION = 2 * 1000; 

    private long stableScaleCalculationStart; 
    private String stableScale; // Avoid comparing floats 
    private long restoringScaleStart; 

    NoZoomedWebViewClient() { 
     stableScaleCalculationStart = System.currentTimeMillis(); 
    } 

    @Override 
    public void onScaleChanged(final WebView view, float oldScale, float newScale) { 
     Log.d(LOG_TAG, "onScaleChanged: " + oldScale + " -> " + newScale); 

     long now = System.currentTimeMillis(); 
     boolean calculating = (now - stableScaleCalculationStart) < STABLE_SCALE_CALCULATION_DURATION; 
     if (calculating) { 
      stableScale = "" + newScale; 
     } else if (!stableScale.equals("" + newScale)) { 
      boolean zooming = (now - restoringScaleStart) < STABLE_SCALE_CALCULATION_DURATION; 
      if (!zooming) { 
       Log.d(LOG_TAG, "Zoom out to stableScale: " + stableScale); 
       restoringScaleStart = now; 
       view.zoomOut(); 

       // Just to make sure, do it one more time 
       view.postDelayed(new Runnable() { 
        @Override 
        public void run() { 
         view.zoomOut(); 
        } 
       }, STABLE_SCALE_CALCULATION_DURATION); 
      } 
     } 
    } 
}