Wie zur Steuerung von zoom in webView

Habe ich diesen code:

[...]
{
    webView = (WebView) findViewById(R.id.webView1);
    webView.setInitialScale(getScale(Double.parseDouble(pubPages)));
    webView.getSettings().setJavaScriptEnabled(true);
    webView.getSettings().setSupportZoom(true);
    webView.getSettings().setBuiltInZoomControls(true);
    webView.getSettings().setDefaultZoom(WebSettings.ZoomDensity.FAR);
    webView.getSettings().setLoadWithOverviewMode(true);
    webView.getSettings().setUseWideViewPort(true);
    webView.setPadding(0, 0, 0, 0);

    webView.setWebChromeClient(new WebChromeClient() {
        public void onProgressChanged(WebView view, int progress)
        {
            activity.setTitle("Loading...");
            activity.setProgress(progress * 100);

            if(progress == 100)
                activity.setTitle(R.string.app_name);
        }
    });

    webView.setWebViewClient(new WebViewClient() {
        @Override
        public void onReceivedError(WebView view, int errorCode, String description, String failingUrl)
        {
            //Handle the error
        }

        @Override
        public boolean shouldOverrideUrlLoading(WebView view, String url)
        {
            view.loadUrl(url);
            return true;
        }
    });

    webView.loadUrl("http://urltoshow");
}

private int getScale(double numPages){
    DisplayMetrics dm = new DisplayMetrics();
    getWindowManager().getDefaultDisplay().getMetrics(dm);
    int screenHeight = dm.heightPixels;

    Double val = (new Double(screenHeight-40)/(new Double(1024)));    
    val = val * 100d;
    return val.intValue();
}

Und es funktioniert gut, aber ich möchte, dass das Zoomen die Seite unter seiner natürlichen Höhe.

Vergrößern ja, verkleinern ja, aber bis zu einem gewissen Punkt.

Wie dies zu tun?

InformationsquelleAutor Nips | 2011-11-08

 webview.getSettings().setBuiltInZoomControls(true);

InformationsquelleAutor Vicky

wenn Sie wollen, um die Kontrolle hinein - Zoomen, dann geht das nicht mit Standard-zoomin-controll.
In Ihrer xml-Datei eingestellt..

<ZoomControls android:id="@+id/zoomctrl"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:gravity="top|center_horizontal"
/>

und jetzt. in Ihrer Tätigkeit Deklarieren und initialisieren ZoomControls zc;

class CurOverlay extends Overlay {
    private GeoPoint pointToDraw;

    public void setPointToDraw(GeoPoint point) {
        pointToDraw = point;
    }

    public OnTouchListener mMapTouch = new OnTouchListener() {

        @Override
        public boolean onTouch(View v, MotionEvent event) {
            Log.v("TAG", "inside onTouch");
            zoomlvl = curmapView.getZoomLevel();
            if (zoomlvl == 19)
                zc.setIsZoomInEnabled(false);
            else if (zoomlvl == 1)
                zc.setIsZoomOutEnabled(false);
            else {
                zc.setIsZoomInEnabled(true);
                zc.setIsZoomOutEnabled(true);
            }
            return false;
        }
    };
            ...
            ....

}

und für das click-Ereignis des zoom-in und zoom-out ist ..

zc.setOnZoomInClickListener(new View.OnClickListener() {
                @Override
                public void onClick(View v) {
                    zc.setIsZoomOutEnabled(true);
                    curmapController.zoomIn();
                    if (curmapView.getZoomLevel() == 19)
                        zc.setIsZoomInEnabled(false);

                }
            });
            zc.setOnZoomOutClickListener(new View.OnClickListener() {
                @Override
                public void onClick(View v) {
                    zc.setIsZoomInEnabled(true);
                    curmapController.zoomOut();
                    if (curmapView.getZoomLevel() == 1)
                        zc.setIsZoomOutEnabled(false);
                }
            });

hoffe diese Karte hilft Ihnen ..

Wo meine legte ich Klasse CurOverlay?
in der Aktivität, wo Sie den Umgang mit Ihrem Kartenansicht und Zoomcontrols
Wo ist die web Ansicht?, Ich bin nicht mit mapView aber webView!!

InformationsquelleAutor Miral Dhokiya

Für zukünftige Generationen:

public class CustomWebView extends WebView {
    static final int NONE = 0;
    static final int DRAG = 1;
    static final int ZOOM = 2;
    int mode = NONE;

    PointF start = new PointF();
    PointF mid = new PointF();
    float oldDist = 1f;
    float scale = 0f;
    float oldscale = 0f;
    int displayHeight;

    public CustomWebView(Context context) {
        super(context);
    }

    public CustomWebView(Context context, AttributeSet attrs, int defStyle) {
        super(context, attrs, defStyle);
    }

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

    @Override
    public boolean onTouchEvent(MotionEvent ev) {
        boolean consumed = super.onTouchEvent(ev);

        if (isClickable())
            switch (ev.getAction() & MotionEvent.ACTION_MASK) {

               case MotionEvent.ACTION_DOWN: 
                  start.set(ev.getX(), ev.getY());
                  mode = DRAG;
                  break;
               case MotionEvent.ACTION_UP: 
               case MotionEvent.ACTION_POINTER_UP: 
                  mode = NONE;
                  break;
               case MotionEvent.ACTION_POINTER_DOWN: 
                  oldDist = spacing(ev);
                  if (oldDist > 5f) {
                     midPoint(mid, ev);
                     mode = ZOOM;
                  }
                  break;

               case MotionEvent.ACTION_MOVE: 
                  if (mode == DRAG) { 
                  }
                  else if (mode == ZOOM) { 
                     float newDist = spacing(ev);
                     if (newDist > 5f) {
                        scale = newDist / oldDist; 
                        if(scale>1){
                            if(Math.abs(oldscale-scale)>0.3){
                                zoomIn();
                                oldscale = scale;
                            }
                        }
                        System.out.println(scale);
                        if(scale<1){
                            if((getContentHeight()*getScale()>displayHeight)){
                                zoomOut();
                                System.out.println(getScale());
                            }
                        }
                     }
                  }
                  break;
               }
        return consumed;
    }

    private float spacing(MotionEvent event) {
           float x = event.getX(0) - event.getX(1);
           float y = event.getY(0) - event.getY(1);
           return FloatMath.sqrt(x * x + y * y);
        }

        private void midPoint(PointF point, MotionEvent event) {
           float x = event.getX(0) + event.getX(1);
           float y = event.getY(0) + event.getY(1);
           point.set(x / 2, y / 2);
        }
}

Diese funktionieren.

InformationsquelleAutor Nips

     FrameLayout mContentView = (FrameLayout) getWindow().
     getDecorView().findViewById(android.R.id.content);
     final View zoom = this.myWebView.getZoomControls();
     mContentView.addView(zoom, ZOOM_PARAMS);
     zoom.setVisibility(View.GONE);