问题
In my apps loading webpage in Web view till that webpage loads need to show progress bar after that progress bar should go..i am using an activity....reply me soon waiting for your answer
04-26 18:02:36.791: D/AndroidRuntime(25114): Shutting down VM
04-26 18:02:36.791: W/dalvikvm(25114): threadid=1: thread exiting with uncaught exception (group=0x41250438)
04-26 18:02:36.811: E/AndroidRuntime(25114): FATAL EXCEPTION: main
04-26 18:02:36.811: E/AndroidRuntime(25114): java.lang.RuntimeException: Unable to instantiate activity ComponentInfo{in.androidapplicationdotin.tneb/in.androidapplicationdotin.tneb.Onlinepayment}: java.lang.NullPointerException
04-26 18:02:36.811: E/AndroidRuntime(25114): at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2038)
04-26 18:02:36.811: E/AndroidRuntime(25114): at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2139)
04-26 18:02:36.811: E/AndroidRuntime(25114): at android.app.ActivityThread.access$700(ActivityThread.java:143)
04-26 18:02:36.811: E/AndroidRuntime(25114): at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1241)
04-26 18:02:36.811: E/AndroidRuntime(25114): at android.os.Handler.dispatchMessage(Handler.java:99)
04-26 18:02:36.811: E/AndroidRuntime(25114): at android.os.Looper.loop(Looper.java:137)
04-26 18:02:36.811: E/AndroidRuntime(25114): at android.app.ActivityThread.main(ActivityThread.java:4960)
04-26 18:02:36.811: E/AndroidRuntime(25114): at java.lang.reflect.Method.invokeNative(Native Method)
04-26 18:02:36.811: E/AndroidRuntime(25114): at java.lang.reflect.Method.invoke(Method.java:511)
04-26 18:02:36.811: E/AndroidRuntime(25114): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:1038)
04-26 18:02:36.811: E/AndroidRuntime(25114): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:805)
04-26 18:02:36.811: E/AndroidRuntime(25114): at dalvik.system.NativeStart.main(Native Method)
04-26 18:02:36.811: E/AndroidRuntime(25114): Caused by: java.lang.NullPointerException
04-26 18:02:36.811: E/AndroidRuntime(25114): at android.content.ContextWrapper.getApplicationInfo(ContextWrapper.java:143)
04-26 18:02:36.811: E/AndroidRuntime(25114): at android.view.ContextThemeWrapper.getTheme(ContextThemeWrapper.java:65)
04-26 18:02:36.811: E/AndroidRuntime(25114): at android.app.AlertDialog.resolveDialogTheme(AlertDialog.java:142)
04-26 18:02:36.811: E/AndroidRuntime(25114): at android.app.AlertDialog.<init>(AlertDialog.java:98)
04-26 18:02:36.811: E/AndroidRuntime(25114): at android.app.ProgressDialog.<init>(ProgressDialog.java:77)
04-26 18:02:36.811: E/AndroidRuntime(25114): at in.androidapplicationdotin.tneb.Onlinepayment.<init>(Onlinepayment.java:24)
04-26 18:02:36.811: E/AndroidRuntime(25114): at java.lang.Class.newInstanceImpl(Native Method)
04-26 18:02:36.811: E/AndroidRuntime(25114): at java.lang.Class.newInstance(Class.java:1319)
04-26 18:02:36.811: E/AndroidRuntime(25114): at android.app.Instrumentation.newActivity(Instrumentation.java:1068)
04-26 18:02:36.811: E/AndroidRuntime(25114): at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2029)
04-26 18:02:36.811: E/AndroidRuntime(25114): ... 11 more
04-26 18:02:42.111: I/GATE(25114): <GATE-M>DEV_ACTION_COMPLETED</GATE-M>
04-26 18:03:30.431: I/Ads(25114): AdLoader timed out after 60000ms while loading the HTML.
04-26 18:03:30.571: I/Ads(25114): AdLoader timed out after 60000ms while loading the HTML.
04-26 18:05:44.491: I/Process(25114): Sending signal. PID: 25114 SIG: 9
回答1:
Try below code -
put this code in onCreate() Method
webView.setWebViewClient(new myWebClient());
webView.getSettings().setJavaScriptEnabled(true);
webView.loadUrl("Your web url");
public class myWebClient extends WebViewClient
{
private ProgressDialog myProgressDialog;
@Override
public void onPageStarted(WebView view, String url, Bitmap favicon) {
// TODO Auto-generated method stub
super.onPageStarted(view, url, favicon);
myProgressDialog = new ProgressDialog(YourActivity.this);
myProgressDialog.setCancelable(false);
myProgressDialog.show();
}
@Override
public boolean shouldOverrideUrlLoading(WebView view, String url) {
// TODO Auto-generated method stub
return true;
}
@Override
public void onPageFinished(WebView view, String url) {
// TODO Auto-generated method stub
super.onPageFinished(view, url);
try{
if (myProgressDialog != null)
myProgressDialog.dismiss();
}
catch(Exception e)
{
e.printStackTrace();
}
}
@Override
public void doUpdateVisitedHistory(WebView view, String url,
boolean isReload) {
// TODO Auto-generated method stub
super.doUpdateVisitedHistory(view, url, isReload);
}
@Override
public void onLoadResource(WebView view, String url) {
// TODO Auto-generated method stub
super.onLoadResource(view, url);
}
}
Hope this code helps you!!!!
If it is not working please let me know i will try to help you more..
回答2:
you can try this...
private ProgressDialog dialog = new ProgressDialog(WebActivity.this);
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.webview);
webView = (WebView) findViewById(R.id.webView1);
Bundle extras = getIntent().getExtras();
String url=extras.getString("adres");
webView.setWebViewClient(new WebViewClient() {
@Override
public void onPageFinished(WebView view, String url) {
if (dialog.isShowing()) {
dialog.dismiss();
}
}
});
dialog.setMessage("Loading..Please wait.");
dialog.setCanceledOnTouchOutside(false);
dialog.show();
webView.loadUrl(url);
WebSettings webSettings = webView.getSettings();
webSettings.setJavaScriptEnabled(true);
}
来源：https://stackoverflow.com/questions/23309227/android-showing-progress-bar-for-webview-in-android