我想要做的是让我的 webView 滚动位置不在顶部时，使我的标题不透明。我已经尝试了很多方法来获得我的滚动位置，比如将 OnScrollListener 和 OnScrollChangedListener 加入到我的活动中，但是任何人都可以工作，我不知道该怎么做。我的活动中有以下 xml 布局
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="fill_parent"
android:layout_height="fill_parent"
tools:context=".BrowserActivity"
>
<LinearLayout
android:id="@+id/header"
android:layout_width="fill_parent"
android:layout_height="44dp"
android:background="@drawable/header" >
<TextView
android:id="@+id/browser_title"
android:layout_width="0dp"
android:layout_height="wrap_content"
android:layout_weight="1"
android:maxLines="1"
android:layout_gravity="center"
android:gravity="center"
android:layout_marginLeft="@dimen/margin_left_browser_title"
android:layout_marginRight="@dimen/margin_right_browser_title"
android:text="@string/empty"
android:textStyle="bold"
android:textSize="@dimen/txt_size_browser_title"
android:textColor="@color/white"
/>
<ProgressBar
android:id="@+id/progressUrl"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_marginLeft="@dimen/margin_left_browser_progress"
android:layout_marginTop="5dp"
android:layout_marginBottom="5dp" />
<Button
android:id="@+id/back"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_marginLeft="@dimen/margin_left_browser_progress"
android:layout_marginTop="3dp"
android:layout_marginBottom="3dp"
android:background="@drawable/btn_navigation_left"
/>
<Button
android:id="@+id/forward"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_marginTop="3dp"
android:layout_marginBottom="3dp"
android:layout_marginRight="@dimen/margin_right_btn_download"
android:background="@drawable/btn_navigation_right"
/>
</LinearLayout>
<WebView
android:id="@+id/webView1"
android:layout_below="@id/header"
android:layout_width="fill_parent"
android:layout_height="fill_parent"
/>
</RelativeLayout>
以及以下活动：
public class BrowserActivity extends Activity {
String url;
WebView webView;
ProgressBar progressUrl;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_browser);
progressUrl = (ProgressBar) findViewById(R.id.progressUrl);
Bundle extras = getIntent().getExtras();
if (extras != null) {
metaDado = extras.getParcelable("metaDado");
}
TextView browserTitle = (TextView) findViewById(R.id.browser_title);
browserTitle.setText(metaDado.getName());
webView = (WebView) findViewById(R.id.webView1);
webView.getSettings().setJavaScriptEnabled(true);
webView.getSettings().setBuiltInZoomControls(true);
webView.getSettings().setSupportZoom(true);
webView.getSettings().setUseWideViewPort(true);
webView.getSettings().setLoadWithOverviewMode(true);
if (metaDado.getType().equals(Constants.FULL)) {
url = "file://" + Constants.DEST_PATH_PARENT + "/" + metaDado.getUuidInstituicao() + "/full/"
+ metaDado.getOfflineUuid() + "/index.html";
} else if (metaDado.getType().equals(Constants.PRES)) {
url = "file://" + Constants.DEST_PATH_PARENT + "/" + metaDado.getUuidInstituicao() + "/pres/"
+ metaDado.getOfflineUuid() + "/" + metaDado.getOfflineUuid() + "/index.html";
}
webView.setWebViewClient(new WebViewClient() {
@Override
public void onPageStarted(WebView view, String url, Bitmap favicon) {
progressUrl.setVisibility(View.VISIBLE);
super.onPageStarted(view, url, favicon);
}
@Override
public boolean shouldOverrideUrlLoading(WebView view, String url) {
view.loadUrl(url);
return true;
}
@Override
public void onPageFinished(WebView view, String url) {
super.onPageFinished(view, url);
progressUrl.setVisibility(View.GONE);
}
});
webView.loadUrl(url);
}
}