如何在浏览器中打开外部网页？

Question

我在集成打开外部链接的代码方面需要帮助。我添加了一些代码来在浏览器中打开链接，但是 webview 只会打开链接而不会将其定向到浏览器。我的网址是正确的。这是一个 webview 应用程序。

package io.eulj.dongdaegu;

import android.content.DialogInterface;
import android.content.Intent;
import android.graphics.Bitmap;
import android.net.Uri;
import android.os.Build;
import android.os.Bundle;
import android.os.Message;
import android.support.v7.app.AlertDialog;
import android.support.v7.app.AppCompatActivity;
import android.support.v7.widget.Toolbar;
import android.view.KeyEvent;
import android.view.Menu;
import android.view.MenuItem;
import android.view.View;
import android.webkit.CookieManager;
import android.webkit.WebChromeClient;
import android.webkit.WebSettings;
import android.webkit.WebView;
import android.webkit.WebViewClient;
import android.widget.ProgressBar;
import im.delight.android.webview.AdvancedWebView;

public class MainActivity extends AppCompatActivity implements AdvancedWebView.Listener {

    public AdvancedWebView webView;
    private ProgressBar mPbar = null;

     public static String url = "https://studywire.eulj.io/app";
    String webURL, webTitle;

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

...
... Irrelevant Code omitted
...
        Toolbar toolbar = (Toolbar) findViewById(R.id.toolbar);
        setSupportActionBar(toolbar);

        //mPbar = (ProgressBar) findViewById(R.id.loader);

        webView = (AdvancedWebView) findViewById(R.id.newWeb);
        webView.loadUrl(url);
        webView.setListener(this, this);

        WebSettings webSettings = webView.getSettings();
        webSettings.setJavaScriptEnabled(true);
        webSettings.setAppCacheEnabled(false);
        webSettings.setDomStorageEnabled(true);
        webSettings.setCacheMode(webSettings.LOAD_NO_CACHE);
        webSettings.setAllowFileAccess(true);
        CookieManager cookieManager = CookieManager.getInstance();
        cookieManager.setAcceptCookie(true);


        webView.setWebChromeClient(new WebChromeClient() {
            @Override
            public boolean onCreateWindow(WebView view, boolean isDialog, boolean isUserGesture, Message resultMsg) {
                AdvancedWebView newWebView = new AdvancedWebView(MainActivity.this);
                WebView.WebViewTransport transport = (WebView.WebViewTransport) resultMsg.obj;
                transport.setWebView(newWebView);
                resultMsg.sendToTarget();
                return true;
            }
        });

        if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.KITKAT) {
            webView.setLayerType(View.LAYER_TYPE_HARDWARE, null);
            webSettings.setAllowUniversalAccessFromFileURLs(true);
        } else {
            webView.setLayerType(View.LAYER_TYPE_SOFTWARE, null);
        }

        /*webView.setWebViewClient(new WebViewClient() {
            @Override
            public void onPageStarted(WebView view, String url, Bitmap favicon) {
                mPbar.setVisibility(View.VISIBLE);
            }

            public void onPageFinished(WebView view, String url) {
                mPbar.setVisibility(View.GONE);
            }
        });*/

        webView.setWebViewClient(new WebViewClient(){
            public boolean shouldOverrideUrlLoading(WebView view, String url) {
                if (url != null && url.startsWith("https://studywire.eulj.io")) {
                    return false;
                } else {
                    view.getContext().startActivity(
                            new Intent(Intent.ACTION_VIEW, Uri.parse(url)));
                    return true;
                }
            }
        });

        webView.setOnKeyListener(new View.OnKeyListener() {
            @Override
            public boolean onKey(View v, int keyCode, KeyEvent event) {
                if ((keyCode == KeyEvent.KEYCODE_BACK) && webView.canGoBack()) {
                        webView.goBack();
                        return true;
                }
                return false;
            }
        });

        webView.setThirdPartyCookiesEnabled(true);
        webView.setCookiesEnabled(true);

        webView.setWebViewClient(new WebViewClient() {
            public void onReceivedError(WebView view, int errorCode, String description, String failingUrl) {
                webView.loadUrl("file:///android_asset/noInternet.html");
            }
        });
    }

    @Override
    public boolean onCreateOptionsMenu(Menu menu) {
        // Inflate the menu; this adds items to the action bar if it is present.
        getMenuInflater().inflate(R.menu.menu_main, menu);
        return true;
    }

    @Override
    public boolean onOptionsItemSelected(MenuItem item) {
        // Handle action bar item clicks here. The action bar will
        // automatically handle clicks on the Home/Up button, so long
        // as you specify a parent activity in AndroidManifest.xml.
        int id = item.getItemId();

        //noinspection SimplifiableIfStatement
        //if (id == R.id.share_btn) {
            Intent sharingIntent = new Intent(Intent.ACTION_SEND);
            sharingIntent.setType("text/plain");
            String shareBody = webTitle + ":\n" + webURL;
            sharingIntent.putExtra(android.content.Intent.EXTRA_SUBJECT, "StudyWire");
            sharingIntent.putExtra(android.content.Intent.EXTRA_TEXT, shareBody);
            startActivity(Intent.createChooser(sharingIntent, "Share using"));
        //} else if (id == R.id.action_settings) {
        //    return true;
        //}

        return super.onOptionsItemSelected(item);
    }


    @Override
    protected void onResume() {
        super.onResume();
        webView.onResume();
    }

    @Override
    protected void onPause() {
        webView.onPause();
        super.onPause();
    }

    @Override
    protected void onDestroy() {
        webView.onDestroy();
        super.onDestroy();
    }

    @Override
    protected void onActivityResult(int requestCode, int resultCode, Intent intent) {
        super.onActivityResult(requestCode, resultCode, intent);
        webView.onActivityResult(requestCode, resultCode, intent);
    }

    @Override
    public void onBackPressed() {
        if (!webView.onBackPressed()) {
            return;
        }
        super.onBackPressed();
    }
}

Answer 1

WebViewClient webViewClient= new WebViewClient(){
@Override
public boolean shouldOverrideUrlLoading(WebView  view, String  url){
    return true;
}
@Override
public void onLoadResource(WebView  view, String  url){
    try {
        Intent i = new Intent(Intent.ACTION_VIEW);
        i.setData(Uri.parse(url));
        startActivity(i);
    } catch (ActivityNotFoundException ignored) {
    }
  }
}

Answer 2

问题是你重写了 WebViewClient 两次，所以最后一次你关闭了你之前写的 shouldOverrideUrlLoading 的实现（setWebViewClient() 替换当前的处理程序）。将onReceivedError 的实现与shouldOverrideUrlLoading 放在同一个WebViewClient 实例中并删除第二个。您的代码应如下所示：

webView.setWebViewClient(new WebViewClient(){
    public boolean shouldOverrideUrlLoading(WebView view, String url) {
        if (url != null && url.startsWith("https://studywire.eulj.io")) {
            return false;
        } else {
            view.getContext().startActivity(
                        new Intent(Intent.ACTION_VIEW, Uri.parse(url)));
            return true;
            }
        }
    });

    public void onReceivedError(WebView view, int errorCode, String description, String failingUrl) {
        webView.loadUrl("file:///android_asset/noInternet.html");
    }