我正在尝试使用WebView创建一个android应用程序。我希望它在内联时存储在缓存中，在脱机时读取在缓存中。内联时，没有问题：它有效。但当我把手机调到飞行模式并刷新应用程序时；网页不可用"；。有人有主意吗？
MainActivity.java:
package com.example.essai2;
import androidx.appcompat.app.AppCompatActivity;
import android.net.ConnectivityManager;
import android.net.NetworkInfo;
import android.os.Bundle;
import android.webkit.WebSettings;
import android.webkit.WebView;
import android.webkit.WebViewClient;
public class MainActivity extends AppCompatActivity {
public WebView webView;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
WebView webView = new WebView(this);
setContentView(webView);
webView.setWebViewClient(new WebViewClient());
WebSettings settings = webView.getSettings();
settings.setSupportMultipleWindows(false);
settings.setLightTouchEnabled(true);
settings.setLoadsImagesAutomatically(true);
settings.setSaveFormData(true);
settings.setJavaScriptEnabled(true);
settings.setAllowFileAccess(true); // dowload/streams de fichiers tels mp4,0gg etc..
settings.setAllowFileAccessFromFileURLs(true);
settings.setAllowUniversalAccessFromFileURLs(true);
// La webview sera charge complétement et normalement (sans zoom)
settings.setLoadWithOverviewMode(true);
settings.setUseWideViewPort(true);
settings.setSupportZoom(true);
// Afficher le contrôle de zoom
settings.setBuiltInZoomControls(true);
settings.setUseWideViewPort(true);
settings.setDomStorageEnabled(true);
settings.setDatabaseEnabled(true);
settings.setAppCacheEnabled(true);
settings.setCacheMode(WebSettings.LOAD_DEFAULT );
settings.setAppCacheMaxSize(1024*1024*8);
settings.setAppCachePath(getApplicationContext().getCacheDir().getAbsolutePath() );
if ( !isNetworkAvailable() ) { // loading offline
webView.getSettings().setCacheMode( WebSettings.LOAD_CACHE_ELSE_NETWORK );
}
webView.loadUrl("https://effisoft.ovh/test/test.htm");
}
private boolean isNetworkAvailable() {
ConnectivityManager connectivityManager = (ConnectivityManager) getSystemService( CONNECTIVITY_SERVICE );
NetworkInfo activeNetworkInfo = connectivityManager.getActiveNetworkInfo();
return activeNetworkInfo != null && activeNetworkInfo.isConnected();
}
}
AndroidManifest.xml：
<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
package="com.example.essai2">
<uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE"/>
<uses-permission android:name="android.permission.INTERNET" />
<uses-permission android:name="android.permission.ACCESS_NETWORK_STATE"/>
<uses-permission android:name="android.permission.ACCESS_WIFI_STATE"/>
<application
android:allowBackup="true"
android:icon="@mipmap/ic_launcher"
android:label="@string/app_name"
android:roundIcon="@mipmap/ic_launcher_round"
android:supportsRtl="true"
android:theme="@style/AppTheme"
android:usesCleartextTraffic="true"
android:launchMode="singleTask"
>
<activity android:name=".MainActivity">
<intent-filter>
<action android:name="android.intent.action.MAIN" />
<category android:name="android.intent.category.LAUNCHER" />
</intent-filter>
</activity>
</application>
</manifest>
activity_main.xml：
<?xml version="1.0" encoding="utf-8"?>
<androidx.constraintlayout.widget.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"
tools:context=".MainActivity"/>
尝试增加AppCacheMaxSize，问题可能是缓存空间不足，WebView被迫从网络重新加载。