我有 WebView，我想在 WebView 中加载页面时，在 ActionBar 中显示进度。该应用程序使用 AppCompat Android 库，应用程序的目标和编译 SDK 版本为 21。只是 WebView 正常运行。

我认为 setSupportProgress(int progress) 方法有问题。

我的代码如下。

Activity :

public class AuthActivity extends ActionBarActivity {

private boolean isConfirmationRequired = false;
private Utils utils = new Utils();

@SuppressLint("SetJavaScriptEnabled")
@Override
protected void onCreate(Bundle savedInstanceState) {
    supportRequestWindowFeature(Window.FEATURE_PROGRESS);
    super.onCreate(savedInstanceState);

    setContentView(R.layout.activity_auth);

    final String authUrl = "some url";
    final WebView authWebView = (WebView) findViewById(R.id.auth_web_view);
    authWebView.getSettings().setJavaScriptEnabled(true);
    authWebView.setWebChromeClient(new WebChromeClient() {
        @Override
        public void onProgressChanged(WebView view, int newProgress) {
            setTitle(R.string.loading);
            setSupportProgress(newProgress * 100);

            if (newProgress == 100)
                setTitle(R.string.sign_in);
        }
    });

    authWebView.setWebViewClient(new WebViewClient() {
        @Override
        public void onPageStarted(WebView view, String url, Bitmap favicon) {
            super.onPageStarted(view, url, favicon);
            if (!url.equals(authUrl))
                isConfirmationRequired = true;
        }

        @Override
        public boolean shouldOverrideUrlLoading(WebView webView, String url) {
            boolean hasUserBrokenAuth = url.equals("some url") ||
                    url.equals("some url");
            boolean isUserAuthorized = url.startsWith("some url" +
                    "access_token=");

            if (hasUserBrokenAuth) {
                if (isConfirmationRequired)
                    utils.showConfirmDialog(AuthActivity.this);
                else
                    finish();
            } else {
                utils.webViewLoadUrlIfInternetIsConnected(AuthActivity.this, authWebView, url);
                if (isUserAuthorized)
                    saveAuthData(url);
            }
            return true;
        }
    });

    utils.webViewLoadUrlIfInternetIsConnected(this, authWebView, authUrl);
}

@Override
public boolean onKeyDown(int keyCode, KeyEvent event) {
    if (keyCode == KeyEvent.KEYCODE_BACK) {
        if (isConfirmationRequired) {
            utils.showConfirmDialog(this);
        }
    }
    return super.onKeyDown(keyCode, event);
}

@Override
public boolean onOptionsItemSelected(MenuItem item) {
    // Handle action bar item clicks here. The action bar will
    // automatically handle clicks on the Home/Up button, so long
    // as you specify a parent activity in AndroidManifest.xml.
    if (isConfirmationRequired) {
        utils.showConfirmDialog(this);
        return true;
    } else {
        return super.onOptionsItemSelected(item);
    }

}

private void saveAuthData(String url) {
    String accessToken = utils.extractPattern(url, "access_token=(.*?)&");
    String userId = utils.extractPattern(url, "user_id=(\\d*)");
}

utils.webViewLoadUrlIfInternetIsConnected:

public void webViewLoadUrlIfInternetIsConnected(final Context context, final WebView webView,
                                                final String url) {
    if (isInternetConnected(context)) {
        webView.loadUrl(url);
    } else {
        showSnackbarInternetDisconnected(context, new ActionClickListener() {
            @Override
            public void onActionClicked(Snackbar snackbar) {
                snackbar.dismiss();
                webViewLoadUrlIfInternetIsConnected(context, webView, url);
            }
        });
    }
}

最佳答案

AppCompat 不支持显示进度 View ，因此您可以从代码中删除以下内容:

supportRequestWindowFeature(Window.FEATURE_INDETERMINATE_PROGRESS);
setSupportProgressBarIndeterminateVisibility(...);

有可能改用新的工具栏，我今天自己试了一下，但它使一切变得复杂。我最终的解决方案是设置一个菜单项更多，该菜单项引用一个布局，该布局引用一个 drawbale:

<menu xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:tools="http://schemas.android.com/tools"
    xmlns:app="http://schemas.android.com/apk/res-auto" >

<item
    android:id="@+id/menu_progress"
    android:visible="false"
    app:showAsAction="always"
    app:actionLayout="@layout/progress_indeterminate"
    tools:ignore="AlwaysShowAction,UnusedAttribute"/>

然后布局看起来像:

<?xml version="1.0" encoding="utf-8"?>
<ProgressBar xmlns:android="http://schemas.android.com/apk/res/android"
    android:id="@+id/toolbar_progress_bar"
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:indeterminateDrawable="@drawable/custom_progress_wheel" />

drawable 如下(您可以根据需要自定义):

<?xml version="1.0" encoding="utf-8"?>
<rotate xmlns:android="http://schemas.android.com/apk/res/android"
    android:fromDegrees="0"
    android:pivotX="50%"
    android:pivotY="50%"
    android:toDegrees="720" >

<shape
    android:innerRadiusRatio="3"
    android:shape="ring"
    android:thicknessRatio="12"
    android:useLevel="false" >

    <gradient
        android:centerColor="#FFFFFF"
        android:centerY="0.50"
        android:endColor="#FFFFFF"
        android:startColor="#000000"
        android:type="sweep"
        android:useLevel="false" />
</shape>
</rotate>

然后在 onCreateOptionsMenu 中使用以下内容初始化 menuItem:

mProgressMenu = menu.findItem(R.id.menu_progress);

使用 setVisibility，您可以在 Activity 中的任何位置更改菜单的可见性。

关于android - ActionBar 不显示进度条，我们在Stack Overflow上找到一个类似的问题： https://stackoverflow.com/questions/28067739/