在WebView加载后面时，请显示Splash屏幕

Question

我正在使用以下代码来用WebView填充我的主要活动，但是由于需要一定时间来加载页面，并且看起来是白色空白。因此，在页面加载完成之前，我想为我的WebView显示Splash屏幕。我不使用布局活动中的任何WebView。

package com.faraksoch.sagar.facebook;
import android.app.Activity;
import android.os.Bundle;
import android.view.Window;
import android.view.WindowManager;
import android.webkit.WebView;
import android.webkit.WebViewClient;
import android.widget.Toast;
public class MainActivity extends Activity {
private WebView mWebview = null;
@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);

    requestWindowFeature(Window.FEATURE_NO_TITLE);
    getWindow().setFlags(WindowManager.LayoutParams.FLAG_FULLSCREEN,
            WindowManager.LayoutParams.FLAG_FULLSCREEN);
    mWebview = new WebView(this);
    mWebview.getSettings().setJavaScriptEnabled(true); // enable javascript
    final Activity activity = this;
    mWebview.setWebViewClient(new WebViewClient() {
        public void onPageFinished(WebView view, int errorCode, String description, String failingUrl) {
            Toast.makeText(activity, description, Toast.LENGTH_SHORT).show();
        }
    });

    mWebview.loadUrl("http://www.google.com//");
    setContentView(mWebview);
}

}

我知道这个代码应该起作用，但是当我组合它们时，我不起作用

  WebView wv = (WebView) findViewById(R.id.webView1);
    wv.getSettings().setJavaScriptEnabled(true);
    wv.setWebViewClient(new WebViewClient() {
        ...
        @Override
        public void onPageFinished(WebView view, String url) {
            //hide loading image
            findViewById(R.id.imageLoading1).setVisibility(View.GONE);
            //show webview
            findViewById(R.id.webView1).setVisibility(View.VISIBLE);
        }

    });     
    wv.loadUrl("http://yoururlhere.com");

任何帮助将不胜感激。预先感谢。

Answer 1

确保WebView在加载之前不会消失。

请参阅下面的代码。

public class WebViewActivity extends AppCompatActivity {
    private WebView mWebView;
    private ImageView mSplashView;
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_web_view);
        mWebView = (WebView) findViewById(R.id.webview);
        mSplashView = (ImageView) findViewById(R.id.splash_view);
        mWebView.getSettings().setJavaScriptEnabled(true); // enable javascript
        mWebView.setWebViewClient(new WebViewClient() {
            @Override
            public void onPageFinished(WebView view, String url) {
                super.onPageFinished(view, url);
                mSplashView.setVisibility(View.GONE);
                mWebView.setVisibility(View.VISIBLE);
                Toast.makeText(getBaseContext(), "Page Loaded.", Toast.LENGTH_SHORT).show();
            }
        });
        mWebView.loadUrl("http://yoururlhere.com");
        mWebView.setVisibility(View.GONE);
        mSplashView.setVisibility(View.VISIBLE);
    }
}

布局：

<?xml version="1.0" encoding="utf-8"?>
<android.support.constraint.ConstraintLayout
    xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:app="http://schemas.android.com/apk/res-auto"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="match_parent"
    android:layout_height="match_parent">

    <WebView
        android:id="@+id/webview"
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        android:visibility="visible"
        />
    <ImageView
        android:id="@+id/splash_view"
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        android:src="@mipmap/ic_launcher"
        android:visibility="gone"
        />

</android.support.constraint.ConstraintLayout>