android WebView中进度条只能显示一次，为什么？

Question

public class WebActivity extends Activity implements View.OnClickListener {

private WebView webView;
private EditText edit_web_adds;
private Button btn_webadds_go, btn_web_back;
private ProgressBar pb;
String Url;

@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_web);

    init();
    btn_webadds_go.setOnClickListener(this);
    btn_web_back.setOnClickListener(this);

    //设置webview支持javascrap
    webView.getSettings().setJavaScriptEnabled(true);
    //设置webview支持缩放
    webView.getSettings().setSupportZoom(true);
    webView.getSettings().setBuiltInZoomControls(true);
    //使用缓存
    webView.getSettings().setAppCacheMaxSize(1024*10);//设置最大允许缓存
    webView.getSettings().setCacheMode(WebSettings.LOAD_CACHE_ELSE_NETWORK);

}

private void init() {
    edit_web_adds=(EditText)this.findViewById(R.id.edit_web_adds);
    btn_webadds_go=(Button)this.findViewById(R.id.btn_webadds_go);
    btn_web_back=(Button)this.findViewById(R.id.btn_web_back);
    webView=(WebView)this.findViewById(R.id.webView);

    pb=(ProgressBar) findViewById(R.id.pb);
    pb.setMax(100);

}


private class xWebViewClient extends WebChromeClient  {
    public void onProgressChanged(WebView view, int newProgress) {
        pb.setProgress(newProgress);
        if (newProgress == 100) {
            pb.setVisibility(View.GONE);
        }
        super.onProgressChanged(view, newProgress);
    }
}

public void onClick(View view) {
    switch (view.getId()){
        case R.id.btn_webadds_go:
            Url=edit_web_adds.getText().toString();

            //覆盖webview默认使用第三方浏览器打开网页的行为，而使用本webview打开
            webView.setWebViewClient(new android.webkit.WebViewClient() {
                public boolean shouldOverrideUrlLoading(WebView view, String url) {
                    //view.loadUrl(url);
                    return false; //设为false时，当按物理返回键可以从重定向的页面返回到重定向前的页面
                }
            });

            webView.setWebChromeClient(new xWebViewClient());

            webView.loadUrl("http://" + Url);

            //隐藏软键盘
            InputMethodManager im=(InputMethodManager) getSystemService(Context.INPUT_METHOD_SERVICE);
            im.hideSoftInputFromWindow(view.getWindowToken(),0);

            break;

        case R.id.btn_web_back:
            WebActivity.this.finish();
            break;
        default:
            break;

    }

}


//改写物理按键——返回键的逻辑
@Override
public boolean onKeyDown(int keyCode,KeyEvent event){
    if (keyCode==KeyEvent.KEYCODE_BACK){
        if (webView.canGoBack()){
            webView.goBack();//返回上一页面

            return true;
        }
        else {
            //System.exit(0);//直接退出程序
            this.onDestroy();//退出当前activity(WebActivity)
        }
    }
    return super.onKeyDown(keyCode,event);
}



@Override
public boolean onCreateOptionsMenu(Menu menu) {
    // Inflate the menu; this adds items to the action bar if it is present.
    getMenuInflater().inflate(R.menu.menu_web, menu);
    return true;
}

@Override
public boolean onOptionsItemSelected(MenuItem item) {
    // Handle action bar item clicks here. The action bar will
    // automatically handle clicks on the Home/Up button, so long
    // as you specify a parent activity in AndroidManifest.xml.
    int id = item.getItemId();

    //noinspection SimplifiableIfStatement
    if (id == R.id.action_settings) {
        return true;
    }

    return super.onOptionsItemSelected(item);
}

}

麻烦看看，怎样可以点击webview里面的链接时，也能显示进度条，并且获取此链接给EditText ？

Answer 1

我找到问题了，在

private class xWebViewClient extends WebChromeClient {
public void onProgressChanged(WebView view, int newProgress) {
pb.setProgress(newProgress);
if (newProgress == 100) {
pb.setVisibility(View.GONE);
}
else {
if (pb.getVisibility()==View.GONE)
pb.setVisibility(View.VISIBLE);
pb.setProgress(newProgress);
}
super.onProgressChanged(view, newProgress);
}
}

这样就可以了，谢谢各位！