webview离线时实现加载缓存

Question

提前感谢我正在尝试将 webview 缓存机制实现到我已经完成的 webview apk，但我无法完成这项工作。 我很不专业。

好的，我做了一些更改，现在我没有错误，但应用程序仍然无法离线运行..

这是我的全部代码：

AndroidManifiest.xml

<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
    package="uy.celular.service.HR" >

    <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"/>
    <activity android:name="A" >
        <intent-filter>
            <category android:name="android.intent.category.DEFAULT" />
            <action android:name="android.intent.action.VIEW" />
            <data android:scheme="activity_a" />
        </intent-filter>
    </activity>
    <uses-sdk android:minSdkVersion="10" android:targetSdkVersion="17"/>
    <application

        android:allowBackup="true"
        android:icon="@mipmap/ic_launcher"
        android:label="@string/app_name"
        android:theme="@android:style/Theme.NoTitleBar" >
        <activity
            android:name=".MainActivity"
            android:label="@string/app_name" >
            <intent-filter>
                <action android:name="android.intent.action.MAIN" />

                <category android:name="android.intent.category.LAUNCHER" />
            </intent-filter>
        </activity>

          </application>

</manifest>

MainActivity.java

package uy.celular.service.HR;

import android.app.Activity;
import android.os.Bundle;
import android.view.View;
import android.view.Window;
import android.view.WindowManager;
import android.webkit.WebSettings;
import android.webkit.WebView;


public class MainActivity extends Activity {

    private WebView webView;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);

        setContentView(uy.celular.service.HR.R.layout.activity_main);
        getWindow().setFlags(WindowManager.LayoutParams.FLAG_FULLSCREEN,
                WindowManager.LayoutParams.FLAG_FULLSCREEN);
        webView = (WebView) findViewById(R.id.activity_main_webview);
        webView.setInitialScale(110);

        WebSettings webSettings = webView.getSettings();
        webSettings.setJavaScriptEnabled(true);
        webView.setWebViewClient(new MyAppWebViewClient() {
            @Override
            public boolean shouldOverrideUrlLoading(WebView view, String url) {
                WebView webView = new WebView(context);
                webView.getSettings().setAppCacheMaxSize(5 * 1024 * 1024); // 5MB
                webView.getSettings().setAppCachePath(getApplicationContext().getCacheDir().getAbsolutePath());
                webView.getSettings().setAllowFileAccess(true);
                webView.getSettings().setAppCacheEnabled(true);
                webView.getSettings().setJavaScriptEnabled(true);
                webView.getSettings().setCacheMode(WebSettings.LOAD_DEFAULT); // load online by default

                if (!isNetworkAvailable()) { // loading offline
                    webView.getSettings().setCacheMode(WebSettings.LOAD_CACHE_ELSE_NETWORK);
                }
                view.loadUrl(url);
                return false;
            }
        });

        webView.loadUrl("http://www.celularservice.uy/p/mobile.html?m=1#trab");
        webView.setWebViewClient(new MyAppWebViewClient(){


            @Override
            public void onPageFinished(WebView view, String url) {
            //hide loading image
            findViewById(R.id.imageLoading1).setVisibility(View.GONE);
            //show webview
            findViewById(R.id.activity_main_webview).setVisibility(View.VISIBLE);

        }});
    }

    @Override
    public void onBackPressed() {
        if(webView.canGoBack()) {
            webView.goBack();
        } else {
            super.onBackPressed();
        }
    }


}

MyAppWebViewClient.java

package uy.celular.service.HR;

import android.content.Intent;
import android.net.ConnectivityManager;
import android.net.NetworkInfo;
import android.net.Uri;
import android.webkit.WebView;
import android.webkit.WebViewClient;
import android.content.Context;

public class MyAppWebViewClient extends WebViewClient {

    public Context context;
    public boolean isNetworkAvailable() {

        ConnectivityManager cm = (ConnectivityManager) this.context.getSystemService(Context.CONNECTIVITY_SERVICE);
        NetworkInfo activeNetworkInfo = cm.getActiveNetworkInfo();
        return activeNetworkInfo != null && activeNetworkInfo.isConnected();
    }
    @Override
        public boolean shouldOverrideUrlLoading(WebView view, String url) {
            if (url != null && url.startsWith("http://www.celularservice.uy/p/wp.html?m=1")) {
                view.getContext().startActivity(
                        new Intent(Intent.ACTION_VIEW, Uri.parse(url)));
                return true;
            }
        if (url != null && url.startsWith("https://")) {
            view.getContext().startActivity(
                    new Intent(Intent.ACTION_VIEW, Uri.parse(url)));
            return true;
        }
        if( url.startsWith("http:") || url.startsWith("https:") ) {
            return false;
        }

        else if (url.startsWith("tel:")) {
            Intent tel = new Intent(Intent.ACTION_DIAL, Uri.parse(url));
            view.getContext().startActivity(tel);
            return true;
        }
        else if (url.startsWith("sms:")) {
            Intent sms = new Intent(Intent.ACTION_SENDTO, Uri.parse(url));
            view.getContext().startActivity(sms);
            return true;
        }

        else if (url.startsWith("mailto:")) {
            Intent mail = new Intent(Intent.ACTION_SEND);
            mail.setType("application/octet-stream");
            mail.putExtra(Intent.EXTRA_EMAIL, new String[]{"celularservice.uy@gmail.com"});
            view.getContext().startActivity(mail);
            return true;
        }
        return true;

    }



}

记住我是新手，请详细回答

Answer 1

替换这些：

webView.getSettings().setAppCacheMaxSize(5 * 1024 * 1024); // 5MB     
webView.getSettings().setAppCachePath(getApplicationContext().getCacheDir().getAbsolutePath());
webView.getSettings().setAllowFileAccess(true);
webView.getSettings().setAppCacheEnabled(true);
webView.getSettings().setJavaScriptEnabled(true);
webView.getSettings().setCacheMode(WebSettings.LOAD_DEFAULT); // load online by 
if (!isNetworkAvailable()) { // loading offline
webView.getSettings().setCacheMode(WebSettings.LOAD_CACHE_ELSE_NETWORK);
}

与

webView.getSettings().setCacheMode(WebSettings.LOAD_CACHE_ELSE_NETWORK);

你可以走了。我建议不要将 webView 用作 WebView 变量。此外，setAppCacheMaxSize 已被弃用。

Answer 2

getSystemService(Context.CONNECTIVITY_SERVICE) 需要上下文。您要么需要将上下文传递给WebViewClient，要么将WebViewClient 设为活动的内部类