webview提示加载进度（WebView在加载完成之前显示loading图标）

1.引入GifView.jar，编写xml文件（为了让loading居中，不得不尝试了很多方法，结果就添加了好几个嵌套的layout才实现，如果有更简洁的方法，请博友告知）：

2. <LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
3. xmlns:tools="http://schemas.android.com/tools"
4. android:layout_width="match_parent"
5. android:layout_height="match_parent"
6. android:background="@color/white"
7. tools:context="com.doorknocker.MainActivity"
8. android:orientation="vertical" >
11. <LinearLayout
12. android:id="@ id/ll_web_view_container"
13. android:layout_width="match_parent"
14. android:layout_height="match_parent" >
17. <RelativeLayout
18. android:id="@ id/rl_loading"
19. android:layout_width="match_parent"
20. android:layout_height="match_parent" >
21. <LinearLayout
22. android:layout_width="match_parent"
23. android:layout_height="wrap_content"
24. android:orientation="vertical"
25. android:gravity="center_horizontal"
26. android:layout_centerVertical="true" >
27. <com.ant.liao.GifView android:id="@ id/gv_loading"
28. android:layout_height="wrap_content"
29. android:layout_width="wrap_content"
30. android:enabled="false" />
31. </LinearLayout>
32. </RelativeLayout>
34. <WebView
35. android:id="@ id/wv_right_content"
36. android:layout_width="match_parent"
37. android:layout_height="match_parent" />
38. </LinearLayout>
41. </LinearLayout>

1. 2.代码：
2. View rootView = inflater.inflate(R.layout.fragment_right, null);
3. wv_right_content = (WebView) rootView.findViewById(R.id.wv_right_content);
4. gv_loading = (GifView) rootView.findViewById(R.id.gv_loading);
5. rl_loading = (RelativeLayout) rootView.findViewById(R.id.rl_loading);
6. gv_loading.setGifImage(R.drawable.loading_gif);
7. // 得到底部菜单栏高度
8. bottomTabHeight = UIUtils.getBottomTabHeight(mActivity);
9. // WebView的高度是屏幕整体高度减去状态栏高度，再减去顶部菜单条高度，再减去底部Tab高度
10. LinearLayout mLayout = (LinearLayout) rootView.findViewById(R.id.ll_web_view_container);
11. Layoutparams params = new LayoutParams(LayoutParams.WRAP_CONTENT, LayoutParams.WRAP_CONTENT);
12. params.height = UIUtils.getScreenHeight(mActivity) - UIUtils.getStatusBarHeight() - bottomTabHeight;
13. mLayout.setLayoutParams(params);
14. WebSettings webSettings = wv_right_content.getSettings();
15. webSettings.setJavaScriptEnabled(true);
16. webSettings.setSupportZoom(true);
17. webSettings.setBuiltInZoomControls(true);
18. //设置Web视图
19. wv_right_content.setWebViewClient(new WebViewClient() {
20. @Override
21. public boolean shouldOverrideUrlLoading(WebView view, String url) {
22. view.loadUrl(url);
23. // 记住当前的URL
24. currentRightUrl = url;
25. // 由当前的WebView处理跳转
26. return true;
27. }
29. @Override
30. public void onPageStarted(WebView view, String url, Bitmap favicon) {
31. rl_loading.setVisibility(View.VISIBLE);
32. wv_right_content.setVisibility(View.GONE);
33. }
35. @Override
36. public void onPageFinished(WebView view, String url) {
37. super.onPageFinished(view, url);
38. rl_loading.setVisibility(View.GONE);
39. wv_right_content.setVisibility(View.VISIBLE);
40. }
41. });
43. return rootView;