Keep current page rendered until the next page is loaded

问题

I have a simple app that is based on WebView.loadUrl("http://www.example.com").

When a user clicks on a URL, the default behavior is to immediately show a blank page, wait until the page is loaded, and then show this page.

I managed to show a splash screen in lieu of the blank page. However, is it possible to keep the current page rendered instead, and render the next page only when it is fully loaded?

回答1:

This is, I feel, a hacky solution. I offer it as a temporary fix until someone posts the "real" way to do this.

MainActivity class:

public class MainActivity extends Activity
{
    WebView webView1, webView2;
    EditText editText;

    @Override
    public void onCreate(Bundle savedInstanceState)
    {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.main);

        editText = (EditText) findViewById(R.id.edit_url);
        webView1 = (WebView) findViewById(R.id.webView_1);
        webView2 = (WebView) findViewById(R.id.webView_2);

        webView1.setWebViewClient(client);
        webView2.setWebViewClient(client);

        webView1.loadUrl(editText.getText().toString());
    }

    private WebViewClient client = new WebViewClient()
    {
        public void onPageFinished(WebView webView, String url)
        {
            if (webView == webView1)
                webView2.setVisibility(View.GONE);
            else
                webView1.setVisibility(View.GONE);

            webView.setVisibility(View.VISIBLE);
            Toast.makeText(MainActivity.this, "WebView " + (webView == webView1 ? "One" : "Two") + " is showing", 0).show();
        }
    };

    private void loadUrl(String url)
    {
        if (webView1.getVisibility() == View.GONE)
            webView1.loadUrl(url);
        else
            webView2.loadUrl(url);
    }

    public void onClick(View v)
    {
        loadUrl(editText.getText().toString());
    }
}

main.xml:

<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:orientation="vertical" >

    <android.webkit.WebView android:id="@+id/webView_1"
        android:layout_width="match_parent"
        android:layout_height="0dp"
        android:layout_weight="1" />

    <android.webkit.WebView android:id="@+id/webView_2"
        android:layout_width="match_parent"
        android:layout_height="0dp"
        android:layout_weight="1"
        android:visibility="gone" />

    <LinearLayout
        android:layout_width="match_parent"
        android:layout_height="wrap_content" >

        <EditText android:id="@+id/edit_url"
            android:layout_width="0dp"
            android:layout_height="wrap_content"
            android:layout_weight="4"
            android:layout_gravity="center_vertical"
            android:text="http://www.example.com" />

        <Button android:id="@+id/button_load"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:onClick="onClick"
            android:text="Load" />

    </LinearLayout>

</LinearLayout>

来源：https://stackoverflow.com/questions/24945962/keep-current-page-rendered-until-the-next-page-is-loaded

标签

android

webview