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我是一名 PHP 编码员，不熟悉 java 和 android 应用程序。我在 youtube 的帮助下用 PHP 创建了 1 个 web 应用程序并为移动用户制作了 1 个 webview 应用程序。

目前我面临2个问题。

  1. 当我在 MainActivity.java 页面上写 https 而不是 http 时，它什么也没有显示，因为我已经安装了通过 xampp 进行的自签名证书。Firefox 和 chrome 浏览器显示证书错误。如何绕过代码中的 SSL 错误？

  2. 无法从 android webview 应用程序下载任何内容。甚至无法在我的手机中打开任何 pdf 链接或下载 pdf。

请帮我解决以上两个问题。

我的 MainActivity.java 代码是。

    package com.qmsproject.qms;

import android.annotation.SuppressLint;
import android.content.ActivityNotFoundException;
import android.content.Intent;
import android.net.Uri;
import android.net.http.SslError;
import android.os.Build;
import android.os.Bundle;
import android.view.KeyEvent;
import android.webkit.SslErrorHandler;
import android.webkit.ValueCallback;
import android.webkit.WebChromeClient;
import android.webkit.WebView;
import android.webkit.WebViewClient;

import androidx.appcompat.app.AppCompatActivity;


public class MainActivity extends AppCompatActivity {


WebView webView;
private ValueCallback<Uri> mUploadMessage;
public ValueCallback<Uri[]> uploadMessage;
public static final int REQUEST_SELECT_FILE = 100;
private final static int FILECHOOSER_RESULTCODE = 1;



public String url ="{MY APPLICATION LINK WITH HTTPS}";
private Object ValueCallback;



 @SuppressLint("SetJavaScriptEnabled")
 @Override
 protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_main);


    webView=(WebView) findViewById(R.id.webview);
    webView.getSettings().setJavaScriptEnabled(true);
    webView.loadUrl(url);
    webView.getSettings().setBuiltInZoomControls(true);
    webView.getSettings().setDisplayZoomControls(false);
    webView.setWebViewClient(new xWebViewClient());
    webView.setWebChromeClient(new WebChromeClient()
    {
        // For 3.0+ Devices (Start)
        // onActivityResult attached before constructor
        protected void openFileChooser(ValueCallback uploadMsg, String acceptType)
        {
            mUploadMessage = uploadMsg;
            Intent i = new Intent(Intent.ACTION_GET_CONTENT);
            i.addCategory(Intent.CATEGORY_OPENABLE);
            i.setType("image/*");
            startActivityForResult(Intent.createChooser(i, "File Browser"),                                           FILECHOOSER_RESULTCODE);
        }


        // For Lollipop 5.0+ Devices
        public boolean onShowFileChooser(WebView mWebView, ValueCallback<Uri[]>      filePathCallback, WebChromeClient.FileChooserParams fileChooserParams)
        {
            if (uploadMessage != null) {
                uploadMessage.onReceiveValue(null);
                uploadMessage = null;
            }

            uploadMessage = filePathCallback;

            Intent intent = null;
            if (android.os.Build.VERSION.SDK_INT >= android.os.Build.VERSION_CODES.LOLLIPOP) {
                intent = fileChooserParams.createIntent();
            }
            try
            {
                startActivityForResult(intent, REQUEST_SELECT_FILE);
            } catch (ActivityNotFoundException e)
            {
                uploadMessage = null;
                return false;
            }
            return true;
        }

        //For Android 4.1 only
        protected void openFileChooser(ValueCallback<Uri> uploadMsg, String acceptType, String capture)
        {
            mUploadMessage = uploadMsg;
            Intent intent = new Intent(Intent.ACTION_GET_CONTENT);
            intent.addCategory(Intent.CATEGORY_OPENABLE);
            intent.setType("image/*");
            startActivityForResult(Intent.createChooser(intent, "File Browser"), FILECHOOSER_RESULTCODE);
        }

        protected void openFileChooser(ValueCallback<Uri> uploadMsg)
        {
            mUploadMessage = uploadMsg;
            Intent i = new Intent(Intent.ACTION_GET_CONTENT);
            i.addCategory(Intent.CATEGORY_OPENABLE);
            i.setType("image/*");
            startActivityForResult(Intent.createChooser(i, "File Chooser"), FILECHOOSER_RESULTCODE);
        }

        
        public void onReceivedSslError(WebView view, SslErrorHandler handler, SslError error) {
            if (BuildConfig.DEBUG) {
                handler.proceed(); // Ignore SSL certificate errors
            }
        }


    });






}


@Override
public void onActivityResult(int requestCode, int resultCode, Intent intent)
{
    if(Build.VERSION.SDK_INT >= Build.VERSION_CODES.LOLLIPOP)
    {
        if (requestCode == REQUEST_SELECT_FILE)
        {
            if (uploadMessage == null)
                return;
            uploadMessage.onReceiveValue(WebChromeClient.FileChooserParams.parseResult(resultCode, intent));
            uploadMessage = null;
        }
    }
    else if (requestCode == FILECHOOSER_RESULTCODE)
    {
        if (null == mUploadMessage)
            return;
        // Use MainActivity.RESULT_OK if you're implementing WebView inside Fragment
        // Use RESULT_OK only if you're implementing WebView inside an Activity
        Uri result = intent == null || resultCode != MainActivity.RESULT_OK ? null : intent.getData();
        mUploadMessage.onReceiveValue(result);
        mUploadMessage = null;
    }


}


private static class xWebViewClient extends WebViewClient {
    @Override
    public boolean shouldOverrideUrlLoading(WebView view, String url) {
        view.loadUrl(url);
        return true;
    }
}


@Override
public boolean onKeyDown(int keyCode, KeyEvent event) {

    if (keyCode == KeyEvent.KEYCODE_BACK && webView.canGoBack()) {
        webView.goBack();
        return true;
    }

    return super.onKeyDown(keyCode, event);
}

}

谢谢

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