在加载H5页面的时候，可能由于网络、页面内容复杂度等原因，导致加载过程出现空白，加上进度条可以有效提高用户体验
一、自定义ProgressWebView类
public class ProgressWebView extends WebView {
private ProgressBar progressbar;
public ProgressWebView(Context context, AttributeSet attrs) {
super(context, attrs);
progressbar = new ProgressBar(context, null,
android.R.attr.progressBarStyleHorizontal);
progressbar.setLayoutParams(new LayoutParams(LayoutParams.FILL_PARENT,
5, 0, 0));
Drawable drawable = context.getResources().getDrawable(R.drawable.progress_bar_states);
progressbar.setProgressDrawable(drawable);
addView(progressbar);
// setWebViewClient(new WebViewClient(){});
setWebChromeClient(new WebChromeClient());
//是否可以缩放
getSettings().setSupportZoom(true);
getSettings().setBuiltInZoomControls(true);
}
public class WebChromeClient extends android.webkit.WebChromeClient {
@Override
public void onProgressChanged(WebView view, int newProgress) {
if (newProgress == 100) {
progressbar.setVisibility(GONE);
} else {
if (progressbar.getVisibility() == GONE)
progressbar.setVisibility(VISIBLE);
progressbar.setProgress(newProgress);
}
super.onProgressChanged(view, newProgress);
}
}
@Override
protected void onScrollChanged(int l, int t, int oldl, int oldt) {
LayoutParams lp = (LayoutParams) progressbar.getLayoutParams();
lp.x = l;
lp.y = t;
progressbar.setLayoutParams(lp);
super.onScrollChanged(l, t, oldl, oldt);
}
}
二、布局文件标签写成自定义的类，使用和一般WebView一致
最后贴一下drawable下的progress_bar_states
<?xml version="1.0" encoding="utf-8"?>
<layer-list xmlns:android="http://schemas.android.com/apk/res/android" >
<item android:id="@android:id/background">
<shape>
<corners android:radius="2dp" />
<gradient
android:angle="270"
android:centerColor="#E3E3E3"
android:endColor="#E6E6E6"
android:startColor="#C8C8C8" />
</shape>
</item>
<item android:id="@android:id/progress">
<clip>
<shape>
<corners android:radius="2dp" />
<gradient
android:centerColor="#4AEA2F"
android:endColor="#31CE15"
android:startColor="#5FEC46" />
</shape>
</clip>
</item>
</layer-list>
