Android 加载webview页面

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最新推荐文章于 2025-04-26 12:42:51 发布

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本文链接：https://blog.youkuaiyun.com/weixin_42630638/article/details/118729242

版权

本文介绍了如何在Android应用中使用WebView组件，详细讲解了设置JavaScript、缓存策略、混合内容处理，以及自定义WebviewClient来控制页面加载行为。重点涵盖了加载网页、防止浏览器打开、后退操作的定制等关键点。

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XML

<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout 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">

    <WebView
        android:id="@+id/web_id"
        android:layout_width="match_parent"
        android:layout_height="match_parent" />
    
</RelativeLayout>

代码

public class MainActivity extends AppCompatActivity {

    private WebView web_id;

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

        initCitView()
    }

    //加载webview
    private void initCitView() {

        web_id = findViewById(R.id.web_id);
        citSettingsWebView();
        web_id.loadUrl("https://www.youkuaiyun.com/");

        //不调用本机浏览器
        web_id.setWebViewClient(new WebViewClient() {
            //覆盖shouldOverrideUrlLoading 方法
            @Override
            public boolean shouldOverrideUrlLoading(WebView view, String url) {
                view.loadUrl(url);
                return true;
            }
        });

    }

    @SuppressLint("SetJavaScriptEnabled")
    private void citSettingsWebView() {

        WebSettings settings = web_id.getSettings();
        settings.setJavaScriptEnabled(true);
        settings.setUseWideViewPort(true);
        settings.setLoadWithOverviewMode(true);

        settings.setSupportZoom(true);
        settings.setBuiltInZoomControls(true);
        settings.setDisplayZoomControls(false);

        settings.setCacheMode(WebSettings.LOAD_CACHE_ELSE_NETWORK);
        settings.setAllowFileAccess(true);
        settings.setLoadsImagesAutomatically(true);
        settings.setDefaultTextEncodingName("utf-8");
        settings.setDomStorageEnabled(true);
        settings.setMixedContentMode(WebSettings.MIXED_CONTENT_ALWAYS_ALLOW);

        web_id.addJavascriptInterface(new CommonJavascriptInterface(), "appActivity");

        CookieManager.getInstance().setAcceptCookie(true);
        CookieManager.getInstance().setAcceptThirdPartyCookies(web_id, true);

    }

    class CommonJavascriptInterface {
        @JavascriptInterface
        public void close() {
            finish();
        }
    }
 
    /**
     * 改写物理按键——返回的逻辑，希望浏览的网页后退而不是退出浏览器
     * @param keyCode
     * @param event
     * @return
     */
    @Override
    public boolean onKeyDown(int keyCode, KeyEvent event) {
    // TODO Auto-generated method stub
        if (keyCode == KeyEvent.KEYCODE_BACK) {
            if (web_id.canGoBack()) {
                web_id.goBack();//返回上一页面
                return true;
            }
        }
        return super.onKeyDown(keyCode, event);
    }

}