android - 在 android 中刷新 webview 时显示微调器

Question

我想知道如何在加载特定页面时在 android webview 中添加加载微调器。在我的应用程序中，我使用的是 webview。我希望当我浏览链接时出现加载进度条或 android 微调器。这是我的 webview 代码。

public class URLActivity extends Activity {

    @SuppressLint("SetJavaScriptEnabled")
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_webview);

        WebView webView = (WebView)findViewById(R.id.webView);

        webView.setInitialScale(0);
        webView.getSettings().setJavaScriptEnabled(true);
        webView.getSettings().setLoadWithOverviewMode(true);
        webView.getSettings().setUseWideViewPort(true);
        webView.setScrollBarStyle(WebView.SCROLLBARS_OUTSIDE_OVERLAY);
        webView.setScrollbarFadingEnabled(false);
        webView.setWebViewClient(new WebViewClient());
        webView.loadUrl("http://www.eternalbs.com");

    }

}

Answer 1

完成测试工作演示

import android.annotation.SuppressLint;
import android.app.Activity;
import android.app.ProgressDialog;
import android.os.Bundle;
import android.webkit.WebChromeClient;
import android.webkit.WebView;
import android.webkit.WebViewClient;

public class URLActivity extends Activity {

    private ProgressDialog progress;

    @SuppressLint("SetJavaScriptEnabled")
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_webview);

        WebView webView = (WebView) findViewById(R.id.webView);
        webView.setInitialScale(0);
        webView.getSettings().setJavaScriptEnabled(true);
        webView.getSettings().setLoadWithOverviewMode(true);
        webView.getSettings().setUseWideViewPort(true);
        webView.setScrollBarStyle(WebView.SCROLLBARS_OUTSIDE_OVERLAY);
        webView.setScrollbarFadingEnabled(false);
        webView.setWebViewClient(new WebViewClient());
        webView.loadUrl("http://www.eternalbs.com");

        webView.setWebChromeClient(new WebChromeClient() {
            @Override
            public void onProgressChanged(WebView view, int newProgress) {
                super.onProgressChanged(view, newProgress);
                if (newProgress > 0) {
                    showProgressDialog("Please Wait");
                }
                if (newProgress >= 100) {
                    hideProgressDialog();
                }
            }
        });

    }

    public void showProgressDialog(final String msg) {

        runOnUiThread(new Runnable() {
            public void run() {
                if (progress == null || !progress.isShowing()) {
                    progress = ProgressDialog.show(URLActivity.this, "", msg);
                }
            }
        });
    }

    public void hideProgressDialog() {
        runOnUiThread(new Runnable() {

            @Override
            public void run() {
                try {
                    if (progress.isShowing())
                        progress.dismiss();
                } catch (Throwable e) {

                }
            }
        });
    }

}