CODEWITHSUNDEEP
javaandroid
ilovebali
ilovebali

Reputation: 543

Need help get content view height - Android

I need some help to get my custom webView CONTENT height, please check below is my code 

    webView.setOnTouchListener(new View.OnTouchListener() {
        @Override
        public boolean onTouch(View v, MotionEvent event) {

            final int displayHeight = webView.getHeight();
            final int contentRange = webView.getContentHeight();
            final int y = v.getScrollY();


            switch (event.getAction()) {
                case MotionEvent.ACTION_DOWN:

                    Log.d("Get webView height ", "" + displayHeight); // Result : 528
                    Log.d("Get webView content height ", "" + contentRange); // Result : 2112
                    Log.d("Get webView content scroll top ", "" + y);

                    return false;

                case MotionEvent.ACTION_CANCEL:
                case MotionEvent.ACTION_UP:
                case MotionEvent.ACTION_MOVE:

            }

            return false;
        };

Above is my code to get my custom webView content height with webview.setOnTouchListener, that code is work.

But, now I want to get my custom WebView content height from button click, that does not work, what I got is always get a height of my webView not the content height, below my code for button click

Button btn = (Button) this.getActivity().findViewById(R.id.btnCLick);

    btn.setOnClickListener(new View.OnClickListener() {

        @Override
        public void onClick(View v) {

            int webViewContentHeight = webView.getContentHeight();

            Log.d("Get my custom webView content height", " " + webViewContentHeight); // Result : 528

        }
    });

Much appreciate if I can have a detailed procedure, thanks.

Upvotes: 0

Views: 449

Answers (3)

nixn
nixn

Reputation: 1478

Sorry for misunderstanding your question before. You can set the View and the Button global in the activity and instantiate it at onCreate. Make a separate onClickEvent for the button, not in OnCreate, where you call the global WebView.getContentHeight() this might work.

And in first case you could get things working right now with sending a click-event to the WebView. More dirty solution.

WebView.performClick();

Upvotes: 0

gduh
gduh

Reputation: 1172

The best way I found to get contentHeight after rendering :

Create your own class extended WebView and this class in your layout :

public class BKWebView extends WebView {

private Activity yourActivity;

public BKWebView(Context context) {
    super(context);
    // TODO Auto-generated constructor stub
}

public BKWebView(Context context, AttributeSet attrs) {
    super(context, attrs);
    // TODO Auto-generated constructor stub
}

public BKWebView(Context context, AttributeSet attrs, int defStyle) {
    super(context, attrs, defStyle);
    // TODO Auto-generated constructor stub
}

@Override
public void invalidate() {
    super.invalidate();

    if (getContentHeight() > 0) {
        // WebView has displayed some content and is scrollable.

        if (yourActivity != null)
            yourActivity.callBackWebView(getContentHeight());

    }
}

/**
 * @param yourActivity the yourActivity to set
 */
public void setYourActivity(Activity yourActivity) {
    this.yourActivity = yourActivity;
}

}

in your activity implement the callback method and then in your listener :

private webViewContentHeight;
BKWebView wv;

protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    ...
    wv = (BKWebView) findViewById(R.id.yourwebview);
    wv.setYourActivity(this);
    ...
}

public void callBackWebView(int contentHeight) {
    webViewContentHeight = contentHeight;
}


...
Button btn = (Button) this.getActivity().findViewById(R.id.btnCLick);
btn.setOnClickListener(new View.OnClickListener() {
    @Override
    public void onClick(View v) {
        Log.d("Get my custom webView content height", " " + webViewContentHeight); 
    }
});
...

Upvotes: 1

MHP
MHP

Reputation: 2731

you can use javascript 

String js = "javascript:function initialize() { "
            + "var d = document.getElementsByTagName('body')[0];"
            + "var visibleH = window.innerHeight; " 
            + "var fullH = d.offsetHeight; "
            + "jsInterface.jsGetContentHeight(visibleH ,fullH); " 
            + "}";  
wv.loadUrl(js);
wv.loadUrl("javascript:initialize()");

and then define JavaScriptInterface for webview to retrieve values 

wv.getSettings().setJavaScriptEnabled(true);
wv.addJavascriptInterface(new JavaScriptInterface(context),
            "jsInterface"); 
public class JavaScriptInterface {
    Context mContext;

    /** Instantiate the interface and set the context */
    JavaScriptInterface(Context c) {
        mContext = c;
    }

    @JavascriptInterface
    public void jsGetContentHeight(int visibleH,int fullH) {
        Toast.makeText(mContext, visibleH +"-"+ fullH, Toast.LENGTH_LONG).show();
    }
}

Upvotes: 0

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