【HarmonyOS】【Demo】【JAVA UI】 鴻蒙怎麼在Webview上新增元件

華為開發者論壇發表於2022-02-14
JavaUI鴻蒙WebView元件

在大家HarmonyOS開發中，Webview元件上新增元件可能是很常見的功能了，HarmonyOS的webview和Android的webwiew存在一點點區別，今天來實現這個功能

  1. 使用專案佈局顯示webview搭建和webview載入連結的基本功能

  2. 解決webview覆蓋層不顯示問題

  3. 檢視執行效果

基礎的webview學習，大家參考如下連結 ：

https://developer.harmonyos.com/cn/docs/documentation/doc-guides/ui-java-component-webview-0000001092715158

第一步 使用DependentLayout 簡單大家一個layout佈局介面


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

<DependentLayout

    xmlns:ohos="http://schemas.huawei.com/res/ohos"

    ohos:height="match_parent"

    ohos:width="match_parent"

    ohos:orientation="vertical"

    ohos:alignment="bottom">

    <ohos.agp.components.webengine.WebView

        ohos:id="$+id:webview"

        ohos:height="match_parent"

        ohos:width="match_parent">

    </ohos.agp.components.webengine.WebView>

 

    <Image

        ohos:id="$+id:myImage"

        ohos:height="100vp"

        ohos:width="100vp"

        ohos:image_src="$media:icon"/>

 

</DependentLayout>

Java程式碼如下:


package com.harmony.alliance.mydemo.slice;

 

import com.harmony.alliance.mydemo.ResourceTable;

import ohos.aafwk.ability.AbilitySlice;

import ohos.aafwk.content.Intent;

import ohos.agp.components.DirectionalLayout;

import ohos.agp.components.webengine.*;

import ohos.media.image.ImagePacker;

import ohos.media.image.PixelMap;

import ohos.media.image.common.PixelFormat;

import ohos.media.image.common.Size;

 

import java.io.File;

import java.io.FileOutputStream;

import java.io.IOException;

import java.io.OutputStream;

 

public class MainAbilitySlice extends AbilitySlice {

    private static final String EXAMPLE_URL = "https://developer.harmonyos.com/cn/docs/documentation/doc-references/js-apis-distributed-migration-0000001050024965";

    @Override

    public void onStart(Intent intent) {

      

        super.onStart(intent);

        super.setUIContent(ResourceTable.Layout_ability_main);

//        dl_bottom.requestForceForwardTouchEvent()

        WebView webView = (WebView) findComponentById(ResourceTable.Id_webview);

        webView.getWebConfig().setJavaScriptPermit(true);  // 如果網頁需要使用JavaScript，增加此行；如何使用JavaScript下文有詳細介紹

        webView.getWebConfig().setWebStoragePermit(true);

        webView.getWebConfig().setDataAbilityPermit(true);

        webView.getWebConfig().setLoadsImagesPermit(true);

        webView.getWebConfig().setMediaAutoReplay(true);

        webView.getWebConfig().setLocationPermit(true);

        webView.getWebConfig().setSecurityMode(WebConfig.SECURITY_SELF_ADAPTIVE);

        webView.load(EXAMPLE_URL);

//        HiLogUtils.PrintLog("webView.load======>>>"+EXAMPLE_URL);

    }

 

    @Override

    public void onActive() {

        super.onActive();

    }

 

    @Override

    public void onForeground(Intent intent) {

        super.onForeground(intent);

    }

   

}

執行效果如下

第二步解決Webview覆蓋層不顯示的問題

這時候我們發現沒有達到我想實現的效果，我們應該怎麼解決呢？

2.1我們需要新增如下程式碼


    private void setWindowBgToAdaptWebView() {

        final String backgroundFileName = "_bg.jpg";

        File file = new File(getContext().getFilesDir(), backgroundFileName);

        if (file.exists()) {

            getWindow().setBackground(file.getPath());

            return;

        }

        PixelMap pixelMap = createBgPixelMap();

        if (pixelMap == null) {

            return;

        }

        ImagePacker imagePacker = ImagePacker.create();

        try (OutputStream outputStream = new FileOutputStream(file)) {

            ImagePacker.PackingOptions options = new ImagePacker.PackingOptions();

            if (!imagePacker.initializePacking(outputStream, options)) {

                return;

            }

            if (!imagePacker.addImage(pixelMap)) {

                return;

            }

            if (imagePacker.finalizePacking() < 0) {

                return;

            }

        } catch (IOException e) {

            e.printStackTrace();

        } finally {

            imagePacker.release();

        }

        getWindow().setBackground(file.getPath());

    }

 

    private PixelMap createBgPixelMap() {

        final int length = 10;

        PixelMap.InitializationOptions initializationOptions = new PixelMap.InitializationOptions();

        initializationOptions.size = new Size(length, length);

        initializationOptions.pixelFormat = PixelFormat.ARGB_8888;

        initializationOptions.editable = true;

        int[] defaultColors = new int[length * length];

        return PixelMap.create(defaultColors, initializationOptions);

}

2.2我們要在OnStart的方法新增如下程式碼

全部程式碼如下


package com.harmony.alliance.mydemo.slice;

 

import com.harmony.alliance.mydemo.ResourceTable;

import ohos.aafwk.ability.AbilitySlice;

import ohos.aafwk.content.Intent;

import ohos.agp.components.DirectionalLayout;

import ohos.agp.components.webengine.*;

import ohos.media.image.ImagePacker;

import ohos.media.image.PixelMap;

import ohos.media.image.common.PixelFormat;

import ohos.media.image.common.Size;

 

import java.io.File;

import java.io.FileOutputStream;

import java.io.IOException;

import java.io.OutputStream;

 

public class MainAbilitySlice extends AbilitySlice {

    private static final String EXAMPLE_URL = "https://developer.harmonyos.com/cn/docs/documentation/doc-references/js-apis-distributed-migration-0000001050024965";

    @Override

    public void onStart(Intent intent) {

        setWindowBgToAdaptWebView();

        super.setUIContent(ResourceTable.Layout_ability_main);

//        dl_bottom.requestForceForwardTouchEvent()

        WebView webView = (WebView) findComponentById(ResourceTable.Id_webview);

        webView.getWebConfig().setJavaScriptPermit(true);  // 如果網頁需要使用JavaScript，增加此行；如何使用JavaScript下文有詳細介紹

        webView.getWebConfig().setWebStoragePermit(true);

        webView.getWebConfig().setDataAbilityPermit(true);

        webView.getWebConfig().setLoadsImagesPermit(true);

        webView.getWebConfig().setMediaAutoReplay(true);

        webView.getWebConfig().setLocationPermit(true);

        webView.getWebConfig().setSecurityMode(WebConfig.SECURITY_SELF_ADAPTIVE);

        webView.load(EXAMPLE_URL);

//        HiLogUtils.PrintLog("webView.load======>>>"+EXAMPLE_URL);

    }

 

    @Override

    public void onActive() {

        super.onActive();

    }

 

    @Override

    public void onForeground(Intent intent) {

        super.onForeground(intent);

    }

 

    private void setWindowBgToAdaptWebView() {

        final String backgroundFileName = "_bg.jpg";

        File file = new File(getContext().getFilesDir(), backgroundFileName);

        if (file.exists()) {

            getWindow().setBackground(file.getPath());

            return;

        }

        PixelMap pixelMap = createBgPixelMap();

        if (pixelMap == null) {

            return;

        }

        ImagePacker imagePacker = ImagePacker.create();

        try (OutputStream outputStream = new FileOutputStream(file)) {

            ImagePacker.PackingOptions options = new ImagePacker.PackingOptions();

            if (!imagePacker.initializePacking(outputStream, options)) {

                return;

            }

            if (!imagePacker.addImage(pixelMap)) {

                return;

            }

            if (imagePacker.finalizePacking() < 0) {

                return;

            }

        } catch (IOException e) {

            e.printStackTrace();

        } finally {

            imagePacker.release();

        }

        getWindow().setBackground(file.getPath());

    }

 

    private PixelMap createBgPixelMap() {

        final int length = 10;

        PixelMap.InitializationOptions initializationOptions = new PixelMap.InitializationOptions();

        initializationOptions.size = new Size(length, length);

        initializationOptions.pixelFormat = PixelFormat.ARGB_8888;

        initializationOptions.editable = true;

        int[] defaultColors = new int[length * length];

        return PixelMap.create(defaultColors, initializationOptions);

    }

}

第三步檢視執行效果

這時候我們在看一下執行效果

更多精彩內容，請見華為開發者官方論壇→https://developer.huawei.com/consumer/cn/forum/home?ha_source=sanfang

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