001 - 使用鸿蒙WebView创建简单浏览器 step 1

原创
04/19 13:48
阅读数 9.1K
  1. 打开官网,找到WebView的文档(模拟器不支持)

    鸿蒙webview的开发指南(原始链接,方便大家识别并点击):https://developer.harmonyos.com/cn/docs/documentation/doc-guides/ui-java-component-webview-0000001092715158

001 - 使用鸿蒙WebView创建简单浏览器 step 1
2. 创建一个Page Ability,把基本布局弄好

001 - 使用鸿蒙WebView创建简单浏览器 step 1

下面是代码

<?xml version="1.0" encoding="utf-8"?>
<DirectionalLayout
    xmlns:ohos="http://schemas.huawei.com/res/ohos"
    ohos:height="match_parent"
    ohos:width="match_parent"
    ohos:orientation="vertical">
    <DirectionalLayout
        ohos:height="30vp"
        ohos:width="match_parent"
        ohos:orientation="horizontal">
        <TextField
            ohos:id="$+id:text_webView_Url"
            ohos:height="match_content"
            ohos:width="match_parent"
            ohos:background_element="$graphic:background_ability_simple_web_view"
            ohos:focus_border_enable="true"
            ohos:hint="请输入网址"
            ohos:max_text_lines="1"
            ohos:multiple_lines="false"
            ohos:scrollable="true"
            ohos:text="www.harmonyos.com"
            ohos:text_size="50"
            ohos:weight="1"
            />
        <Button
            ohos:id="$+id:button_webview_surf"
            ohos:height="match_content"
            ohos:width="60vp"
            ohos:background_element="$graphic:button_element"
            ohos:text="跳转"
            ohos:text_size="50"/>
    </DirectionalLayout>
    <ProgressBar
        ohos:id="$+id:other_webView_progressBar"
        ohos:height="10vp"
        ohos:width="match_parent"
        ohos:visibility="hide">
    </ProgressBar>
    <ohos.agp.components.webengine.WebView
        ohos:id="$+id:webview_webview_webview"
        ohos:height="match_parent"
        ohos:width="match_parent"
        ohos:weight="1">
    </ohos.agp.components.webengine.WebView>
    <DirectionalLayout
        ohos:height="30vp"
        ohos:width="match_parent"
        ohos:orientation="horizontal">
        <DirectionalLayout
            ohos:height="match_content"
            ohos:width="match_parent"
            ohos:orientation="horizontal"
            ohos:weight="1">
            <Button
                ohos:id="$+id:button_webview_back"
                ohos:height="match_content"
                ohos:width="match_parent"
                ohos:background_element="$graphic:button_element"
                ohos:layout_alignment="horizontal_center"
                ohos:text="向后"
                ohos:text_size="50"
                >
            </Button>
        </DirectionalLayout>
        <DirectionalLayout
            ohos:height="match_content"
            ohos:width="match_parent"
            ohos:orientation="horizontal"
            ohos:weight="1">
            <Button
                ohos:id="$+id:button_webview_refresh"
                ohos:height="match_content"
                ohos:width="match_parent"
                ohos:background_element="$graphic:button_element"
                ohos:layout_alignment="horizontal_center"
                ohos:text="刷新"
                ohos:text_size="50">
            </Button>
        </DirectionalLayout>
        <DirectionalLayout
            ohos:height="match_content"
            ohos:width="match_parent"
            ohos:orientation="horizontal"
            ohos:weight="1">
            <Button
                ohos:id="$+id:button_webview_forward"
                ohos:height="match_content"
                ohos:width="match_parent"
                ohos:background_element="$graphic:button_element"
                ohos:layout_alignment="horizontal_center"
                ohos:text="向前"
                ohos:text_size="50">
            </Button>
        </DirectionalLayout>
    </DirectionalLayout>
</DirectionalLayout>
 
  1. 把基本的按钮事件弄好

    序号 按钮 功能
    1 跳转 把文本框中的网址打开
    2 后退 在webview中点了新链接后,想回去看一看
    3 刷新 以前的人在网络不好,美女图片出不来的时候用,现在一般是发了一篇帖子后,作者会没事点一下,看看有没有人点赞
    4 前进 跟后退是关联用的,就是点了新链接,回去看了看后,还是觉得新链接更好看,就又要前进.

    代码

        Component.ClickedListener clickedListener = new Component.ClickedListener() {
            @Override
            public void onClick(Component component) {
                int componentId = component.getId();
                switch (componentId) {
                    case ResourceTable.Id_button_webview_surf: {
                        urlAddress = textWebViewUrl.getText();
                        if (urlAddress.isEmpty()) {
                            return;
                        }
                        if (!urlAddress.startsWith(FinalValue.URL_HTTPS)) {
                            urlAddress = FinalValue.URL_HTTPS + urlAddress;
                        }
                        webView.load(urlAddress);
    
                       
                    }
                    break;
                    case ResourceTable.Id_button_webview_back: {
                        if (webView.getNavigator().canGoBack()) {
                            webView.getNavigator().goBack();
                        }
                    }
                    break;
                    case ResourceTable.Id_button_webview_refresh: {
                        webView.reload();
                    }
                    break;
                    case ResourceTable.Id_button_webview_forward: {
                        if (webView.getNavigator().canGoForward()) {
                            webView.getNavigator().goForward();
                        }
                    }
                    break;
                    default: {
                        System.out.println("没有选择任何的页面");
                    }
                    break;
                }
            }
        };
    
    
  • 把WebView照文档上面的要求弄好

    没啥好说的,就是规定.我加在了调用load方法打开网址那行代码后面,我还弄了一个跟进度条关联的功能

      //允许javascript交互
    
                        WebConfig webConfig = webView.getWebConfig();
                        webConfig.setDataAbilityPermit(true);
                        webConfig.setJavaScriptPermit(true);
                        webConfig.setLoadsImagesPermit(true);
                        webConfig.setMediaAutoReplay(true);
                        webConfig.setLocationPermit(true);
                        webConfig.setSecurityMode(WebConfig.SECURITY_SELF_ADAPTIVE);
    
                        webView.setWebAgent(new WebAgent() {
                            @Override
                            public void onLoadingPage(WebView webView, String url, PixelMap favicon) {
                                super.onLoadingPage(webView, url, favicon);
                                // 这儿我加了一个更新网址文本框中新页面url的功能
                                if (url != urlAddress) {
                                   textWebViewUrl.setText(url);
                                }
    
                            }
    
                            @Override
                            public void onPageLoaded(WebView webView, String url) {
                                super.onPageLoaded(webView, url);
                                // 页面加载结束后自定义处理
                            }
    
                            @Override
                            public void onLoadingContent(WebView webView, String url) {
                                super.onLoadingContent(webView, url);
                                // 加载资源时自定义处理
                            }
    
                            @Override
                            public void onError(WebView webView, ResourceRequest request, ResourceError error) {
                                super.onError(webView, request, error);
                                // 发生错误时自定义处理
                            }
                        });
                        webView.setBrowserAgent(new BrowserAgent(SimpleWebViewAbilitySlice.this) {
                            @Override
                            public void onTitleUpdated(WebView webView, String title) {
                                super.onTitleUpdated(webView, title);
                                // 标题变更时自定义处理
                            }
    
                            @Override
                            public void onProgressUpdated(WebView webView, int newProgress) {
                                super.onProgressUpdated(webView, newProgress);
                                if (newProgress < FinalValue.PROGRESS_BAR_FINISHED) {
                                    otherWebViewProgressBar.setVisibility(Component.VISIBLE);
                                    otherWebViewProgressBar.setProgressValue(newProgress);
                                } else if (newProgress == FinalValue.PROGRESS_BAR_FINISHED) {
                                    otherWebViewProgressBar.setVisibility(Component.HIDE);
                                }
                                // 加载进度变更时自定义处理
                            }
                        });
    
     
  • 完事?or完了还有事?

    从上面拷代码的话,估计完事了.但是,我是用的回忆,但是代码却没有回退,所以我还是有必要在这儿把步骤中的问题说一说,方便不拷代码的同学也能跑出一个界面.主要体现如下:

    1. 权限配置,不多说

       "reqPermissions": [
            {
              "name": "ohos.permission.INTERNET"
            }
          ]
      
       
  • xml中的WebView要带包名

      <ohos.agp.components.webengine.WebView
            ohos:id="$+id:webview_webview_webview"
            ohos:height="match_parent"
            ohos:width="match_parent"
            ohos:weight="1">
        </ohos.agp.components.webengine.WebView>
     
    1. 不按上面包名写的话:

      • 真机运行后没有WebView的界面.哪怕weight=1,也不行
      • 点击跳转按钮后,PageAbility会闪退,回到首屏(调用它的页面)

    完事效果:https://www.bilibili.com/video/BV1tK4y1o7Hz/

  • 完整代码

    • 布局

      序号为2的步骤中贴全了

    • 按钮背景

      <?xml version="1.0" encoding="UTF-8" ?>
      <shape xmlns:ohos="http://schemas.huawei.com/res/ohos"
             ohos:shape="rectangle">
          <corners
              ohos:radius="20"/>
          <solid
              ohos:color="#70dbdb"/>
      </shape>
      
       
  • java代码

    package com.javaaier.family.huawei.slice;
    
    import com.javaaier.family.huawei.ResourceTable;
    import com.javaaier.family.huawei.common.FinalValue;
    import ohos.aafwk.ability.AbilitySlice;
    import ohos.aafwk.content.Intent;
    import ohos.agp.components.*;
    import ohos.agp.components.webengine.*;
    import ohos.media.image.PixelMap;
    
    /**
     * @Author JavaAIer
     * @Description : webview控件例子1:用于简单的测试webview的用法 <br/>
     * 001 简单webview示例
     * @Date: 2021/4/16
     */
    public class SimpleWebViewAbilitySlice extends AbilitySlice {
        String urlAddress;
    
    
        ProgressBar otherWebViewProgressBar;
        TextField textWebViewUrl;
        Button buttonWebViewSurf, buttonWebViewBack, buttonWebViewRefresh, buttonWebViewForward;
        WebView webView;
    
        Component.ClickedListener clickedListener = new Component.ClickedListener() {
            @Override
            public void onClick(Component component) {
                int componentId = component.getId();
                switch (componentId) {
                    case ResourceTable.Id_button_webview_surf: {
                        urlAddress = textWebViewUrl.getText();
                        if (urlAddress.isEmpty()) {
                            return;
                        }
                        if (!urlAddress.startsWith(FinalValue.URL_HTTPS)) {
                            urlAddress = FinalValue.URL_HTTPS + urlAddress;
                        }
                        webView.load(urlAddress);
    
                        //允许javascript交互
    
                        WebConfig webConfig = webView.getWebConfig();
                        webConfig.setDataAbilityPermit(true);
                        webConfig.setJavaScriptPermit(true);
                        webConfig.setLoadsImagesPermit(true);
                        webConfig.setMediaAutoReplay(true);
                        webConfig.setLocationPermit(true);
                        webConfig.setSecurityMode(WebConfig.SECURITY_SELF_ADAPTIVE);
    
                        webView.setWebAgent(new WebAgent() {
                            @Override
                            public void onLoadingPage(WebView webView, String url, PixelMap favicon) {
                                super.onLoadingPage(webView, url, favicon);
                                // 页面开始加载时自定义处理
                                if (url != urlAddress) {
                                   textWebViewUrl.setText(url);
                                }
    
                            }
    
                            @Override
                            public void onPageLoaded(WebView webView, String url) {
                                super.onPageLoaded(webView, url);
                                // 页面加载结束后自定义处理
                            }
    
                            @Override
                            public void onLoadingContent(WebView webView, String url) {
                                super.onLoadingContent(webView, url);
                                // 加载资源时自定义处理
                            }
    
                            @Override
                            public void onError(WebView webView, ResourceRequest request, ResourceError error) {
                                super.onError(webView, request, error);
                                // 发生错误时自定义处理
                            }
                        });
                        webView.setBrowserAgent(new BrowserAgent(SimpleWebViewAbilitySlice.this) {
                            @Override
                            public void onTitleUpdated(WebView webView, String title) {
                                super.onTitleUpdated(webView, title);
                                // 标题变更时自定义处理
                            }
    
                            @Override
                            public void onProgressUpdated(WebView webView, int newProgress) {
                                super.onProgressUpdated(webView, newProgress);
                                if (newProgress < FinalValue.PROGRESS_BAR_FINISHED) {
                                    otherWebViewProgressBar.setVisibility(Component.VISIBLE);
                                    otherWebViewProgressBar.setProgressValue(newProgress);
                                } else if (newProgress == FinalValue.PROGRESS_BAR_FINISHED) {
                                    otherWebViewProgressBar.setVisibility(Component.HIDE);
                                }
                                // 加载进度变更时自定义处理
                            }
                        });
                    }
                    break;
                    case ResourceTable.Id_button_webview_back: {
                        if (webView.getNavigator().canGoBack()) {
                            webView.getNavigator().goBack();
                        }
                    }
                    break;
                    case ResourceTable.Id_button_webview_refresh: {
                        webView.reload();
                    }
                    break;
                    case ResourceTable.Id_button_webview_forward: {
                        if (webView.getNavigator().canGoForward()) {
                            webView.getNavigator().goForward();
                        }
                    }
                    break;
                    default: {
                        System.out.println("没有选择任何的页面");
                    }
                    break;
                }
            }
        };
    
        /**
         * @Author JavaAIer
         * @Description :
         * @Date: 2021/4/16 14:46
         * * @param intent
         */
        @Override
    
        public void onStart(Intent intent) {
            super.onStart(intent);
            super.setUIContent(ResourceTable.Layout_ability_simple_web_view);
            otherWebViewProgressBar = (ProgressBar) findComponentById(ResourceTable.Id_other_webView_progressBar);
            textWebViewUrl = (TextField) findComponentById(ResourceTable.Id_text_webView_Url);
            buttonWebViewSurf = (Button) findComponentById(ResourceTable.Id_button_webview_surf);
            buttonWebViewSurf.setClickedListener(clickedListener);
            buttonWebViewBack = (Button) findComponentById(ResourceTable.Id_button_webview_back);
            buttonWebViewBack.setClickedListener(clickedListener);
            buttonWebViewRefresh = (Button) findComponentById(ResourceTable.Id_button_webview_refresh);
            buttonWebViewRefresh.setClickedListener(clickedListener);
            buttonWebViewForward = (Button) findComponentById(ResourceTable.Id_button_webview_forward);
            buttonWebViewForward.setClickedListener(clickedListener);
            webView = (WebView) findComponentById(ResourceTable.Id_webview_webview_webview);
    
    
        }
    
        @Override
        public void onActive() {
            super.onActive();
        }
    
        @Override
        public void onForeground(Intent intent) {
            super.onForeground(intent);
        }
    }
    /*
    * 这一截卡哇伊大喵在config.json用了,我发现用不用没啥区别啊
    * https://blog.csdn.net/qq_33259323/article/details/115596296
    *  "default": {
          "network": {
            "cleartextTraffic": true,
            "securityConfig": {
              "domainSettings": {
                "cleartextPermitted": true,
                "domains": [
                  {
                    "subdomains": true,
                    "name": "www.harmonyos.com"
                  }
                ]
              }
            }
          }
        }
    *
    * */
    
     
 

 
- config.json
 
   ``` json
   {
     "app": {
       "bundleName": "com.javaaier.family.huawei",
       "vendor": "javaaier",
       "version": {
         "code": 1,
         "name": "1.0"
       },
       "apiVersion": {
         "compatible": 5,
         "target": 5,
         "releaseType": "Beta1"
       }
     },
     "deviceConfig": {
   
     },
     "module": {
       "package": "com.javaaier.family.huawei",
       "name": ".MyApplication",
       "deviceType": [
         "phone"
       ],
       "distro": {
         "deliveryWithInstall": true,
         "moduleName": "entry",
         "moduleType": "entry"
       },
       "abilities": [
         {
           "skills": [
             {
               "entities": [
                 "entity.system.home"
               ],
               "actions": [
                 "action.system.home"
               ]
             }
           ],
           "orientation": "unspecified",
           "name": "com.javaaier.family.huawei.MainAbility",
           "icon": "$media:icon",
           "description": "$string:mainability_description",
           "label": "$string:app_name",
           "type": "page",
           "launchType": "standard"
         },
         {
           "orientation": "unspecified",
           "name": "com.javaaier.family.huawei.SimpleWebViewAbility",
           "icon": "$media:icon",
           "description": "$string:simplewebviewability_description",
           "label": "$string:app_name",
           "type": "page",
           "launchType": "standard"
         }
       ],
       "reqPermissions": [
         {
           "name": "ohos.permission.INTERNET"
         }
       ]
     }
   }

作者:人工智能姬

想了解更多内容,请访问51CTO和华为合作共建的鸿蒙社区:https://harmonyos.51cto.com#kyzg

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