public static void setDefaultZoom(WebSettings settings, ZoomDensityCompat zoom) {
	switch (zoom) {
	case FAR: {
		settings.setDefaultZoom(ZoomDensity.FAR);
		break;
	}
	case MEDIUM: {
		settings.setDefaultZoom(ZoomDensity.MEDIUM);
		break;
	}
	case CLOSE: {
		settings.setDefaultZoom(ZoomDensity.CLOSE);
		break;
	}
	default: {
		break;
	}
	}
}
 

@SuppressWarnings("deprecation")
@SuppressLint("SetJavaScriptEnabled")
public static void loadUrlAdaptiveScreen(Context mContext, WebView webview,
                                         String url, boolean javaScriptEnabled) {
    WebSettings webSettings = webview.getSettings();
    webSettings.setJavaScriptEnabled(javaScriptEnabled);
    // 自适应屏幕
    // 第一种：
    // WebSetting settings = webView.getSettings();
    // settings.setLayoutAlgorithm(LayoutAlgorithm.SINGLE_COLUMN);
    // 把所有内容放在webview等宽的一列中。（可能会出现页面中链接失效）
    // 第二种：
    // settings.setUseWideViewPort(true);
    // settings.setLoadWithOverviewMode(true);
    // 第三种：
    DisplayMetrics metrics = new DisplayMetrics();
    ((Activity) mContext).getWindowManager().getDefaultDisplay()
            .getMetrics(metrics);
    int mDensity = metrics.densityDpi;
    if (mDensity <= 120) {
        webSettings.setDefaultZoom(ZoomDensity.CLOSE);
    } else if (mDensity > 120 && mDensity < 240) {
        webSettings.setDefaultZoom(ZoomDensity.MEDIUM);
    } else if (mDensity >= 240) {
        webSettings.setDefaultZoom(ZoomDensity.FAR);
    }

    webview.setWebViewClient(new WebViewClient());
    webview.loadUrl(url);

}
 

private void init() {
	this.setBackgroundColor(Color.TRANSPARENT); // Background color
	this.setInitialScale(1); // Make whole image viewable.
	this.getSettings().setUseWideViewPort(true);
	this.getSettings().setDefaultZoom(ZoomDensity.FAR);
	this.getSettings().setLoadWithOverviewMode(true);

}
 

@Override
public void onPageStarted(WebView view, String url, Bitmap favicon) {
	super.onPageStarted(view, url, favicon);

	Log.d("SocialAuth-WebView", "onPageStart:" + url);

	// To set zoom density of runkeeper dialog for various densities
	if (url.startsWith("https://runkeeper.com/apps/authorize") & count < 1) {
		if (Util.UI_DENSITY == 120 && Util.UI_SIZE == 4 || Util.UI_DENSITY == 160 && Util.UI_SIZE == 3
				|| Util.UI_DENSITY == 240) {
			mWebView.getSettings().setDefaultZoom(ZoomDensity.FAR);
			count = 1;
		} else {
			if (Util.UI_DENSITY == 160 && Util.UI_SIZE == 10)
				mWebView.getSettings().setDefaultZoom(ZoomDensity.CLOSE);

			count = 1;
		}
	}

	// To set zoom density of linkedin dialog for ldpi and mdpi
	if (mProviderName.toString().equalsIgnoreCase("linkedin")) {
		if (Util.UI_DENSITY == 120 || Util.UI_DENSITY == 240)
			mWebView.getSettings().setDefaultZoom(ZoomDensity.FAR);
		else if (Util.UI_DENSITY == 160) {
			if (Util.UI_SIZE == 3)
				mWebView.getSettings().setDefaultZoom(ZoomDensity.FAR);
			else
				mWebView.getSettings().setDefaultZoom(ZoomDensity.CLOSE);
		} else if (Util.UI_DENSITY == 213)
			mWebView.getSettings().setDefaultZoom(ZoomDensity.CLOSE);

	}

	// To set zoom density of yammer dialog
	if (mProviderName.toString().equalsIgnoreCase("yammer")) {
		if (Util.UI_DENSITY == 160) {
			if (Util.UI_SIZE == 10)
				mWebView.getSettings().setDefaultZoom(ZoomDensity.MEDIUM);
		} else
			mWebView.getSettings().setDefaultZoom(ZoomDensity.FAR);
	}

	// To set zoom density of googleplus/google/salesforce/instagram
	// dialog
	if (mProviderName.toString().equalsIgnoreCase("google")
			|| mProviderName.toString().equalsIgnoreCase("googleplus")
			|| mProviderName.toString().equalsIgnoreCase("salesforce")
			|| mProviderName.toString().equalsIgnoreCase("instagram")) {
		if (Util.UI_DENSITY == 160 && Util.UI_SIZE == 3 || Util.UI_DENSITY == 120 && Util.UI_SIZE == 4
				|| Util.UI_DENSITY == 240)
			mWebView.getSettings().setDefaultZoom(ZoomDensity.FAR);
		else if (Util.UI_DENSITY == 213)
			mWebView.getSettings().setDefaultZoom(ZoomDensity.CLOSE);
	}

	mSpinner.show();

	// For Linkedin, MySpace, Runkeeper - Calls onPageStart to
	// authorize.
	if (url.startsWith(mProviderName.getCallBackUri())) {
		if (url.startsWith(mProviderName.getCancelUri())) {
			mListener.onCancel();
		} else {
			final Map<String, String> params = Util.parseUrl(url);
			Runnable runnable = new Runnable() {
				@Override
				public void run() {
					try {
						AuthProvider auth = mSocialAuthManager.connect(params);

						// Don't save token for yahoo, yammer,
						// salesforce
						if (!mProviderName.toString().equalsIgnoreCase("yammer")
								|| !mProviderName.toString().equalsIgnoreCase("salesforce"))
							writeToken(auth);

						handler.post(new Runnable() {
							@Override
							public void run() {

								if (mSpinner != null && mSpinner.isShowing())
									mSpinner.dismiss();

								Bundle bundle = new Bundle();
								bundle.putString(SocialAuthAdapter.PROVIDER, mProviderName.toString());
								mListener.onComplete(bundle);
							}
						});
					} catch (Exception e) {
						e.printStackTrace();
						mListener.onError(new SocialAuthError("Could not connect using SocialAuth", e));
					}
				}
			};
			new Thread(runnable).start();
		}
		SocialAuthDialog.this.dismiss();
	}
}