加载 Webview 后隐藏进度条

Question

我是安卓工作室的新手。我的问题是 webview 加载完成后进度条没有停止旋转。

我也试过这个-

progressbar.setVisibility(View.VISIBLE); //to show
        progressbar.setVisibility(View.GONE); // to hide

但错误没有解决

我的第一个 Fragment Java 类-

import android.app.AlertDialog;
import android.app.Fragment;
import android.content.DialogInterface;
import android.os.Bundle;
import android.support.annotation.Nullable;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.webkit.WebSettings;
import android.webkit.WebView;
import android.webkit.WebViewClient;
import android.widget.ProgressBar;

import com.google.android.gms.ads.AdRequest;
import com.google.android.gms.ads.AdView;


public class firstfragment extends Fragment{

    public WebView mywebview2;

    @Nullable
    @Override
    public View onCreateView(LayoutInflater inflater, @Nullable ViewGroup container, Bundle savedInstanceState) {

        View v = inflater.inflate(R.layout.first_layout, container, false);
        mywebview2 = (WebView) v.findViewById(R.id.WebView);
        mywebview2.loadUrl("https://m.youtube.com");
        mywebview2.setWebViewClient(new WebViewClient());

        // Enable Javascript
        WebSettings webSettings = mywebview2.getSettings();
        webSettings.setJavaScriptEnabled(true);
        AdView mAdView = (AdView) v.findViewById(R.id.adView);
        AdRequest adRequest = new AdRequest.Builder().build();
        mAdView.loadAd(adRequest);
        return v;
    }

    public void onPageFinished(WebView view,String url){
        ProgressBar progressbar = (ProgressBar) view.findViewById(R.id.progressBar2);
        progressbar.setVisibility(View.VISIBLE); //to show
        progressbar.setVisibility(View.GONE); // to hide
    }

}

Answer 1

您不应该在 onPageFinished 内声明这一行 ProgressBar progressbar = (ProgressBar) view.findViewById(R.id.progressBar2); 。您必须在onCreateView 中声明它 你的代码：

public void onPageFinished(WebView view,String url){
    ProgressBar progressbar = (ProgressBar) view.findViewById(R.id.progressBar2);
    progressbar.setVisibility(View.VISIBLE); //to show
    progressbar.setVisibility(View.GONE); // to hide
}

在这里，您的view.findViewById(R.id.progressBar2) 指的是您的WebView 视图，与您的进度条无关。

所以应该是-

private ProgressBar progressbar;
public View onCreateView(LayoutInflater inflater, @Nullable ViewGroup container, Bundle savedInstanceState) {

    View v = inflater.inflate(R.layout.first_layout, container, false);
    mywebview2 = (WebView) v.findViewById(R.id.WebView);


    //here
    progressbar = (ProgressBar) v.findViewById(R.id.progressBar2);
    // Enable Javascript
    WebSettings webSettings = mywebview2.getSettings();
    webSettings.setJavaScriptEnabled(true);
    AdView mAdView = (AdView) v.findViewById(R.id.adView);
    AdRequest adRequest = new AdRequest.Builder().build();
    mAdView.loadAd(adRequest);
    myWebView2.setWebViewClient(new WebViewClient() {
    @Override
    public void onPageStarted(WebView view, String url) {

        progressbar.setVisibility(View.VISIBLE);
return true;
    }

    @Override
    public void onPageFinished(WebView view, String url) {

        progressbar.setVisibility(View.GONE);
return true;
    }
});
mywebview2.loadUrl("https://m.youtube.com");
    return v;
}

Answer 2

公共类 firstfragment 扩展 Fragment {

    public WebView mywebview2;
    private ProgressBar progressbar;


    @Nullable
    @Override
    public View onCreateView(LayoutInflater inflater, @Nullable ViewGroup container, Bundle savedInstanceState) {

        View v = inflater.inflate(R.layout.first_layout, container, false);
        mywebview2 = (WebView) v.findViewById(R.id.WebView);
        mywebview2.setWebViewClient(new WebViewClient());
        progressbar = (ProgressBar) view.findViewById(R.id.progressBar2);

        // Enable Javascript
        WebSettings webSettings = mywebview2.getSettings();
        webSettings.setJavaScriptEnabled(true);
        mywebview2.setWebViewClient(new WebViewClient() {
            @Override
            public void onPageStarted(WebView view, String url, Bitmap favicon) {
                super.onPageStarted(view, url, favicon);
                progressbar.setVisibility(View.VISIBLE);
            }

            @Override
            public void onPageFinished(WebView view, String url) {
                super.onPageFinished(view, url);
                progressbar.setVisibility(View.GONE);
            }
        });
        mywebview2.loadUrl("https://m.youtube.com");
        AdView mAdView = (AdView) v.findViewById(R.id.adView);
        AdRequest adRequest = new AdRequest.Builder().build();
        mAdView.loadAd(adRequest);
        return v;
    }
}

Answer 3

@Override
public void onPageFinished(WebView view, String url)
{
   super.onPageFinished(view, url);
   progressBar.setVisibility(view.GONE);
}

Answer 4

用下面的代码试试这个，你可以根据网页视图中的数据加载和页面加载进度条隐藏后加载进度

    String url = "";
    webView = (WebView) findViewById(R.id.web);
        webView.getSettings().setJavaScriptEnabled(true);
        webView.getSettings().setSupportZoom(true);
        webView.getSettings().setBuiltInZoomControls(true);
        webView.loadUrl(url);
         progressBar = (ProgressBar) findViewById(R.id.progressbar);


        progressBar.setMax(100);
        progressBar.setProgress(1);


        webView.setWebChromeClient(new WebChromeClient() {
            public void onProgressChanged(WebView view, int progress) {
                progressBar.setProgress(progress);
            }
        });
 webView.setWebViewClient(new WebViewClient() {

            @Override
            public void onPageStarted(WebView view, String url, Bitmap favicon) {
                super.onPageStarted(view, url, favicon);
                progressBar.setVisibility(View.VISIBLE);


            }



            @Override
            public boolean shouldOverrideUrlLoading(WebView view, String url) {
                view.loadUrl(url);
                return true;
            }

            @Override
            public void onPageFinished(WebView view, String url) {
//                progressDialog.hide();
                progressBar.setVisibility(View.GONE);
            }
        });

    }

布局文件

 <?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:app="http://schemas.android.com/apk/res-auto"
    android:id="@+id/activity_web_view"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:orientation="vertical">


    <WebView
        android:id="@+id/web"
        android:layout_width="match_parent"
        android:layout_height="match_parent" />

    <ProgressBar
        android:layout_marginTop="-7dp"
        android:id="@+id/progressbar"
        style="?android:attr/progressBarStyleHorizontal"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:layout_alignParentTop="true"
        android:background="@android:color/transparent"
        android:indeterminate="false"
        android:max="100"
        android:progress="1"
        android:theme="@style/ProgressbarTheme" />

</RelativeLayout>

如有任何疑问，请咨询我