001 - 使用鸿蒙WebView创建简单浏览器 step 1 原创 精华

发布于 2021-4-17 09:22
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  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-开源基础软件社区
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-开源基础软件社区

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>
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  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;
                }
            }
        };
    
    
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  2. 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
                            }
                        });
    
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  3. 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"
            }
          ]
      
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    2. 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>
      
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      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/

  4. 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>
      
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    • 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"
                    }
                  ]
                }
              }
            }
          }
      *
      * */
      
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- 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"
         }
       ]
     }
   }
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