我正在尝试向使用WebView
的应用程序添加进度/加载栏。我对如何实现每次点击链接时出现的进度条感到困惑。
当前代码:
public class CULearnBrowser extends Activity {
WebView webview;
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.main);
webview = (WebView) findViewById(R.id.webview);
webview.setWebViewClient(new HelloWebViewClient());
webview.getSettings().setJavaScriptEnabled(true);
webview.loadUrl("https://culearn.colorado.edu/webct/entryPageIns.dowebct");
}
private class HelloWebViewClient extends WebViewClient {
@Override
public boolean shouldOverrideUrlLoading(WebView view, String url) {
view.loadUrl(url);
return true;
}
}
public boolean onKeyDown(int keyCode, KeyEvent event) {
if ((keyCode == KeyEvent.KEYCODE_BACK) && webview.canGoBack()) {
webview.goBack();
return true;
}
return super.onKeyDown(keyCode, event);
}
}
活动布局:
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:orientation="vertical"
android:layout_width="fill_parent"
android:layout_height="fill_parent">
<WebView xmlns:android="http://schemas.android.com/apk/res/android"
android:id="@+id/webview"
android:layout_width="fill_parent"
android:layout_height="fill_parent" />
<TextView
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:text="@string/hello" />
</LinearLayout>
答案 0 :(得分:68)
此link可能会对您有所帮助。
我在您的代码中添加了几行,现在它可以正常使用进度条。
getWindow().requestFeature(Window.FEATURE_PROGRESS);
setContentView(R.layout.main );
// Makes Progress bar Visible
getWindow().setFeatureInt( Window.FEATURE_PROGRESS, Window.PROGRESS_VISIBILITY_ON);
webview = (WebView) findViewById(R.id.webview);
webview.setWebChromeClient(new WebChromeClient() {
public void onProgressChanged(WebView view, int progress)
{
//Make the bar disappear after URL is loaded, and changes string to Loading...
setTitle("Loading...");
setProgress(progress * 100); //Make the bar disappear after URL is loaded
// Return the app name after finish loading
if(progress == 100)
setTitle(R.string.app_name);
}
});
webview.setWebViewClient(new HelloWebViewClient());
webview.getSettings().setJavaScriptEnabled(true);
webview.loadUrl("http://www.google.com");
答案 1 :(得分:13)
在 oncreate 方法中设置了您的Webview。
@Override
protected void onCreate(Bundle savedInstanceState) {
// TODO Auto-generated method stub
super.onCreate(savedInstanceState);
this.requestWindowFeature(Window.FEATURE_NO_TITLE);
setContentView(R.layout.web_view);
web_view = (WebView) findViewById(R.id.web_view);
pd = new ProgressDialog(SiteOpenInWebView.this);
pd.setMessage("Please wait Loading...");
pd.show();
web_view.setWebViewClient(new MyWebViewClient());
web_view.loadUrl("ur site name");
}
<强> WebViewClient 强>
private class MyWebViewClient extends WebViewClient {
@Override
public boolean shouldOverrideUrlLoading(WebView view, String url) {
view.loadUrl(url);
if (!pd.isShowing()) {
pd.show();
}
return true;
}
@Override
public void onPageFinished(WebView view, String url) {
System.out.println("on finish");
if (pd.isShowing()) {
pd.dismiss();
}
}
}
答案 2 :(得分:12)
通过此方法传递您的网址
private void startWebView(String url) {
WebSettings settings = webView.getSettings();
settings.setJavaScriptEnabled(true);
webView.setScrollBarStyle(View.SCROLLBARS_OUTSIDE_OVERLAY);
webView.getSettings().setBuiltInZoomControls(true);
webView.getSettings().setUseWideViewPort(true);
webView.getSettings().setLoadWithOverviewMode(true);
progressDialog = new ProgressDialog(ContestActivity.this);
progressDialog.setMessage("Loading...");
progressDialog.show();
webView.setWebViewClient(new WebViewClient() {
@Override
public boolean shouldOverrideUrlLoading(WebView view, String url) {
view.loadUrl(url);
return true;
}
@Override
public void onPageFinished(WebView view, String url) {
if (progressDialog.isShowing()) {
progressDialog.dismiss();
}
}
@Override
public void onReceivedError(WebView view, int errorCode, String description, String failingUrl) {
Toast.makeText(ContestActivity.this, "Error:" + description, Toast.LENGTH_SHORT).show();
}
});
webView.loadUrl(url);
}
答案 3 :(得分:7)
将进度条和webview放在relativelayout中,并按如下方式设置进度条的属性,
然后在webclient的onPageStarted()中使进度条可见,以便在您单击链接时显示进度条。在onPageFinished()中,将进度条可见性设置为GONE,以便在页面加载完成后消失...这将适用于您的场景。希望这会有所帮助...
答案 4 :(得分:7)
以下是我正在使用的代码:
内部WebViewClient:
@Override
public void onPageStarted(WebView view, String url, Bitmap favicon) {
super.onPageStarted(view, url, favicon);
findViewById(R.id.progress1).setVisibility(View.VISIBLE);
}
@Override
public void onPageFinished(WebView view, String url) {
findViewById(R.id.progress1).setVisibility(View.GONE);
}
这是XML:
<ProgressBar
android:id="@+id/progress1"
android:layout_centerHorizontal="true"
android:layout_centerVertical="true"
android:layout_width="wrap_content"
android:layout_height="wrap_content" />
希望这会有所帮助..
答案 5 :(得分:7)
最适合我的approch是
webView.setWebViewClient(new WebViewClient() {
@Override public void onPageStarted(WebView view, String url, Bitmap favicon) {
super.onPageStarted(view, url, favicon);
mProgressBar.setVisibility(ProgressBar.VISIBLE);
webView.setVisibility(View.INVISIBLE);
}
@Override public void onPageCommitVisible(WebView view, String url) {
super.onPageCommitVisible(view, url);
mProgressBar.setVisibility(ProgressBar.GONE);
webView.setVisibility(View.VISIBLE);
isWebViewLoadingFirstPage=false;
}
}
答案 6 :(得分:1)
您可以在活动中尝试使用此代码
private void startWebView(WebView webView,String url) {
webView.setWebViewClient(new WebViewClient() {
ProgressDialog progressDialog;
public boolean shouldOverrideUrlLoading(WebView view, String url) {
view.loadUrl(url);
return false;
}
@Override
public void onPageStarted(WebView view, String url, Bitmap favicon) {
super.onPageStarted(view, url, favicon);
}
public void onLoadResource (WebView view, String url) {
if (progressDialog == null) {
progressDialog = new ProgressDialog(SponceredDetailsActivity.this);
progressDialog.setMessage("Loading...");
progressDialog.show();
}
}
public void onPageFinished(WebView view, String url) {
try{
if (progressDialog.isShowing()) {
progressDialog.dismiss();
progressDialog = null;
}
}catch(Exception exception){
exception.printStackTrace();
}
}
});
webView.getSettings().setJavaScriptEnabled(true);
webView.loadUrl(url);
}
使用这种方式调用此方法:
startWebView(web_view,"Your Url");
有时如果URL已经死了,它将被重定向,它将在onPageFinished方法之前到达onLoadResource()。因此,进度条不会消失。要解决此问题,请参阅my this Answer。
谢谢:)
答案 7 :(得分:0)
我尝试在方法 onPageFinished()上取得进展,但效果不是很好,呈现Webview会有时间延迟。
尝试更好地使用 onPageCommitVisible():
val progressBar = ProgressDialog(context)
progressBar.setCancelable(false)
progressBar.show()
val url = "your url here"
web_container.settings.javaScriptEnabled = true
web_container.loadUrl(url)
web_container.webViewClient = object : WebViewClient() {
override fun shouldOverrideUrlLoading(view: WebView, url: String): Boolean {
view.loadUrl(url)
progressBar.show()
return true
}
override fun onPageFinished(view: WebView?, url: String?) {
super.onPageFinished(view, url)
}
override fun onPageCommitVisible(view: WebView?, url: String?) {
super.onPageCommitVisible(view, url)
progressBar.dismiss()
}
}
web_container.setOnKeyListener(View.OnKeyListener { _, keyCode, event ->
if (keyCode == KEYCODE_BACK && event.action == MotionEvent.ACTION_UP
&& web_container.canGoBack()) {
web_container.goBack()
return@OnKeyListener true
}
return@OnKeyListener false
})