android webview函数onPagefinished被调用两次
我的android webview函数android webview函数onPagefinished被调用两次,android,android-webview,Android,Android Webview,我的android webview函数onPageFinished被调用两次。我不知道为什么，但它在安卓2.2上运行良好，但当我升级到4+时，它就不起作用了。代码附在下面 代码 @Override public void onPageFinished(WebView view, String url) { if (url.startsWith(MobileConstants.PUSHPIN_CALLBACK_URL)) {
onPageFinished@Override
public void onPageFinished(WebView view, String url) {
if (url.startsWith(MobileConstants.PUSHPIN_CALLBACK_URL)) {
if (url.indexOf("code=")!=-1) {
String code = url.substring(url.indexOf("code=")+5);
Log.i ("code", code);
if (code != null && !code.equals("") ){
view.setVisibility(View.GONE);
Token accessToken = service.getAccessToken(null, new Verifier(code));
Log.i("access_token",accessToken.getToken());
SharedPreferences settings = getSharedPreferences("access_token" , 0);
SharedPreferences.Editor editor = settings.edit();
if(accessToken.getToken() != null)
editor.putString("access_token", accessToken.getToken() );
Intent map3 = new Intent(OAuthAccessTokenActivity.this, Dashboard.class);
map3.putExtra("access_token", accessToken.getToken());
startActivity(map3);
}
} else if (url.indexOf("error=")!=-1) {
view.setVisibility(View.INVISIBLE);
}
}
System.out.println("onPageFinished : " + url);
}
@Override
public boolean shouldOverrideUrlLoading(WebView view, String url){
if (url.startsWith(MobileConstants.CALLBACK_URL)) {
if (url.indexOf("code=") != -1) {
String code = url.substring(url.indexOf("code=")+5);
Log.i ("code", code);
if (code != null && !code.equals("") ){
view.setVisibility(View.GONE);
Token accessToken = service.getAccessToken(null, new Verifier(code));
Log.i("access_token",accessToken.getToken());
SharedPreferences settings = getSharedPreferences("access_token" , 0);
SharedPreferences.Editor editor = settings.edit();
if(accessToken.getToken() != null)
editor.putString("access_token", accessToken.getToken() );
access = accessToken.getToken();
Intent map3 = new Intent(OAuthAccessTokenActivity.this, Dashboard.class);
map3.putExtra("access_token", accessToken.getToken());
startActivity(map3);
return true;
}
} else if (url.indexOf("error=")!=-1) {
view.setVisibility(View.INVISIBLE);
return false;
}
}
System.out.println("onPageFinished : " + url);
return super.shouldOverrideUrlLoading(view, url);
}
07-22 14:29:50.523: E/AndroidRuntime(1186): FATAL EXCEPTION: main
07-22 14:29:50.523: E/AndroidRuntime(1186): java.lang.NullPointerException
07-22 14:29:50.523: E/AndroidRuntime(1186): at com.facebook.android.OAuthAccessTokenActivity$1.onPageFinished(OAuthAccessTokenActivity.java:83)
07-22 14:29:50.523: E/AndroidRuntime(1186): at android.webkit.CallbackProxy.handleMessage(CallbackProxy.java:327)
07-22 14:29:50.523: E/AndroidRuntime(1186): at android.os.Handler.dispatchMessage(Handler.java:99)
07-22 14:29:50.523: E/AndroidRuntime(1186): at android.os.Looper.loop(Looper.java:137)
07-22 14:29:50.523: E/AndroidRuntime(1186): at android.app.ActivityThread.main(ActivityThread.java:4745)
07-22 14:29:50.523: E/AndroidRuntime(1186): at java.lang.reflect.Method.invokeNative(Native Method)
07-22 14:29:50.523: E/AndroidRuntime(1186): at java.lang.reflect.Method.invoke(Method.java:511)
07-22 14:29:50.523: E/AndroidRuntime(1186): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:786)
07-22 14:29:50.523: E/AndroidRuntime(1186): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:553)
07-22 14:29:50.523: E/AndroidRuntime(1186): at dalvik.system.NativeStart.main(Native Method)
我通过将代码从onPageFinished移动到此函数解决了这个问题 代码
@Override
public void onPageFinished(WebView view, String url) {
if (url.startsWith(MobileConstants.PUSHPIN_CALLBACK_URL)) {
if (url.indexOf("code=")!=-1) {
String code = url.substring(url.indexOf("code=")+5);
Log.i ("code", code);
if (code != null && !code.equals("") ){
view.setVisibility(View.GONE);
Token accessToken = service.getAccessToken(null, new Verifier(code));
Log.i("access_token",accessToken.getToken());
SharedPreferences settings = getSharedPreferences("access_token" , 0);
SharedPreferences.Editor editor = settings.edit();
if(accessToken.getToken() != null)
editor.putString("access_token", accessToken.getToken() );
Intent map3 = new Intent(OAuthAccessTokenActivity.this, Dashboard.class);
map3.putExtra("access_token", accessToken.getToken());
startActivity(map3);
}
} else if (url.indexOf("error=")!=-1) {
view.setVisibility(View.INVISIBLE);
}
}
System.out.println("onPageFinished : " + url);
}
@Override
public boolean shouldOverrideUrlLoading(WebView view, String url){
if (url.startsWith(MobileConstants.CALLBACK_URL)) {
if (url.indexOf("code=") != -1) {
String code = url.substring(url.indexOf("code=")+5);
Log.i ("code", code);
if (code != null && !code.equals("") ){
view.setVisibility(View.GONE);
Token accessToken = service.getAccessToken(null, new Verifier(code));
Log.i("access_token",accessToken.getToken());
SharedPreferences settings = getSharedPreferences("access_token" , 0);
SharedPreferences.Editor editor = settings.edit();
if(accessToken.getToken() != null)
editor.putString("access_token", accessToken.getToken() );
access = accessToken.getToken();
Intent map3 = new Intent(OAuthAccessTokenActivity.this, Dashboard.class);
map3.putExtra("access_token", accessToken.getToken());
startActivity(map3);
return true;
}
} else if (url.indexOf("error=")!=-1) {
view.setVisibility(View.INVISIBLE);
return false;
}
}
System.out.println("onPageFinished : " + url);
return super.shouldOverrideUrlLoading(view, url);
}
我也有同样的问题，但我只需要停止一个进度条。
我在PageStarted方法中的进度条中再次“解决”了它。这不是一个好的解决方案，但在我的例子中已经足够了。哪一个是第83行，它使空指针执行？Token accessToken=service.getAccessToken（null，新的验证器（代码））；问题是一旦我得到了代码，但在事情进展顺利后得到了代码，我得到了访问令牌，但它再次调用此函数，此时代码已过期，它给出了空指针异常我已经解决了问题，有人能告诉我如何回答吗？遇到了相同的问题（我想我使用的示例代码与您使用的相同）. 你有没有发现为什么我们必须使用shouldOverrideUrlLoading而不是更直观的onPageFinished？