关于android:HarmonyOSDemoJAVA-UI-鸿蒙怎么在Webview上添加组件

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在大家 HarmonyOS 开发中，Webview 组件上增加组件可能是很常见的性能了，HarmonyOS 的 webview 和 Android 的 webwiew 存在一点点区别，明天来实现这个性能

  1. 应用我的项目布局显示 webview 搭建和 webview 加载链接的基本功能
  2. 解决 webview 覆盖层不显示问题
  3. 查看运行成果

根底的 webview 学习，大家参考如下链接：

https://developer.harmonyos.c…

第一步 应用 DependentLayout 简略大家一个 layout 布局界面 


<?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 代码如下:


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);  // 如果网页须要应用 JavaScript，减少此行；如何应用 JavaScript 下文有具体介绍

        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);

    }

   

}

运行成果如下

第二步解决 Webview 覆盖层不显示的问题

这时候咱们发现没有达到我想实现的成果，咱们应该怎么解决呢？

2.1 咱们须要增加如下代码 


    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 咱们要在 OnStart 的办法增加如下代码

全副代码如下 


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);  // 如果网页须要应用 JavaScript，减少此行；如何应用 JavaScript 下文有具体介绍

        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);

    }

}

第三步查看运行成果

这时候咱们在看一下运行成果

更多精彩内容，请见华为开发者官方论坛→https://developer.huawei.com/…

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android
发表至： android
2022-02-14
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