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java - 尝试在加载 WebView URL 时在 Android Studio 2.3.3 中实现启动画面图像

转载 作者:行者123 更新时间:2023-11-30 00:28:30 27 4
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这个“闪屏问题”也有类似的问题,但没有人为我工作,或者我做错了什么。我插入了这个答案中的代码 Splash Screen Code .该应用程序从启动画面开始,一秒钟后启动画面消失,然后显示白色背景。加载网站后,它不会在下一步中向我显示 WebView。谁能帮帮我?

这是我的 MainActivity.java 代码:

import android.annotation.SuppressLint;
import android.app.Activity;
import android.content.Intent;
import android.net.ConnectivityManager;
import android.net.NetworkInfo;
import android.net.Uri;
import android.os.Handler;
import android.support.v4.widget.SwipeRefreshLayout;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.view.View;
import android.webkit.WebSettings;
import android.webkit.WebView;
import android.webkit.WebViewClient;
import android.widget.Toast;


import static jombi.mooni.R.id.swiperefresh;

public class MainActivity extends AppCompatActivity {
// declare private WebView Variable
private WebView wb;
// method to check for active network connection (caching website)
private boolean isNetworkAvailable() {
ConnectivityManager connectivityManager = (ConnectivityManager) getSystemService(CONNECTIVITY_SERVICE);
NetworkInfo activeNetworkInfo = connectivityManager.getActiveNetworkInfo();
return activeNetworkInfo != null && activeNetworkInfo.isConnected();
}


@SuppressLint("SetJavaScriptEnabled")
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
// link the wb Variable to the WebView Component using the webView Id which we gave in the beginning in activity_main.xml-Designansicht
wb = (WebView) findViewById(R.id.WebView);
assert wb != null;
WebSettings webSettings = wb.getSettings();

WebViewClientImpl webViewClient = new WebViewClientImpl(this);
wb.setWebViewClient(webViewClient);

// caching whole website when online from website when offline from cache
wb.getSettings().setAppCachePath(getApplicationContext().getCacheDir().getAbsolutePath());
wb.getSettings().setAllowFileAccess( true );
wb.getSettings().setAppCacheEnabled( true );
wb.getSettings().setLoadsImagesAutomatically(true);
//activate JavaScript
webSettings.setJavaScriptEnabled(true);
wb.getSettings().setCacheMode( WebSettings.LOAD_DEFAULT ); // load online by default
if ( !isNetworkAvailable() ) { // loading offline
wb.getSettings().setCacheMode(WebSettings.LOAD_CACHE_ELSE_NETWORK);


}


// load custom errorpage
wb.setWebViewClient(new WebViewClient(){
@SuppressWarnings("deprecation")
@Override
public void onReceivedError(android.webkit.WebView view, int errorCode, String description, String failingUrl) {
wb.loadUrl("file:///android_asset/errorpage/index.html");
}


@Override

public void onPageFinished(WebView view, String url) {

//hide loading image

findViewById(R.id.imgLogo).setVisibility(View.GONE);

//show webview

findViewById(R.id.WebView).setVisibility(View.VISIBLE);

}

});

// call with wb variable the method loadurl
wb.loadUrl("http://xxx.yyy.zz");


// swipe to refresh screen
final SwipeRefreshLayout SwipeRefreshLayout = (SwipeRefreshLayout) findViewById(swiperefresh);
SwipeRefreshLayout.setColorSchemeResources(android.R.color.holo_orange_dark, android.R.color.holo_orange_light, android.R.color.holo_red_dark, android.R.color.holo_red_light);
SwipeRefreshLayout.setOnRefreshListener(new SwipeRefreshLayout.OnRefreshListener() {
@Override
public void onRefresh() {
wb.loadUrl("javascript:window.location.reload(true)");

refreshItems();
}
void refreshItems() {
// Load items
SwipeRefreshLayout.setRefreshing(true);
// Load complete
onItemsLoadComplete();
}

void onItemsLoadComplete() {
// Update the adapter and notify data set changed
// ...

// Stop refresh animation
SwipeRefreshLayout.setRefreshing(false);
}
});


}

private Boolean exit = false;
@Override
// when Back Button pressed load previous page and at last page display end message
public void onBackPressed() {
if (wb.canGoBack()) {
wb.goBack();
} else {
if (exit)
this.finish();
else {
Toast.makeText(this, "Push to close app",
Toast.LENGTH_SHORT).show();
exit = true;
new Handler().postDelayed(new Runnable() {
@Override
public void run() {
exit = false;
}
}, 3 * 1000);
}

}
}



// own URL in WebView, external URL in AndroidBrowser
private class WebViewClientImpl extends WebViewClient {

private Activity activity = null;

private WebViewClientImpl(Activity activity) {
this.activity = activity;
}

@SuppressWarnings("deprecation")
@Override
public boolean shouldOverrideUrlLoading(WebView view, String url) {
if(url.contains("xxx.yyy.zz") ) return false;

Intent intent = new Intent(Intent.ACTION_VIEW, Uri.parse(url));
activity.startActivity(intent);
return true;
}
//End own URL in WebView, external URL in AndroidBrowser
}


}

和activity_main.xml:

<?xml version="1.0" encoding="utf-8"?>
<android.support.v4.widget.SwipeRefreshLayout
xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="match_parent"
android:layout_height="match_parent"
tools:context="jombi.mooni.MainActivity"
android:id="@+id/swiperefresh">

<ImageView
android:id="@+id/imgLogo"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:layout_centerHorizontal="true"
android:layout_centerVertical="true"
android:visibility="visible"
android:background="@color/colorPrimaryDark"
android:src="@drawable/boat" />

<WebView
android:id="@+id/WebView"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:visibility="gone"
tools:ignore="MissingConstraints"
tools:layout_editor_absoluteX="8dp"
tools:layout_editor_absoluteY="8dp">
</WebView>

最佳答案

来源:https://stackoverflow.com/a/9589451/8252521

回答者:https://stackoverflow.com/users/374866/davehale23

I do it by initially showing an ImageView and then once the WebView has loaded, swapping their visibility like this

        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");

And my xml layout looks like this

    <ImageView android:id="@+id/imageLoading1"
android:layout_height="fill_parent"
android:layout_width="fill_parent"
android:visibility="visible"
android:src="@drawable/vert_loading"
/>
<WebView android:id="@+id/webView1"
android:layout_height="fill_parent"
android:layout_width="fill_parent"
android:visibility="gone"
/>

关于java - 尝试在加载 WebView URL 时在 Android Studio 2.3.3 中实现启动画面图像,我们在Stack Overflow上找到一个类似的问题: https://stackoverflow.com/questions/44928955/

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