【ARKUI】HarmonyOS 如何设置桌面壁纸

参考资料

​​壁纸​​

​​Context模块​​

api讲解

wallpaper.setWallpaper

setWallpaper(source: string | image.PixelMap, wallpaperType: WallpaperType): Promise

将指定资源设置为指定类型的壁纸。

需要权限：ohos.permission.SET_WALLPAPER

系统能力: SystemCapability.MiscServices.Wallpaper

参数：

参数名	类型	必填	说明
source	string |PixelMap	是	JPEG或PNG文件的Uri路径，或者PNG格式文件的位图。
wallpaperType	WallpaperType	是	壁纸类型。

返回值：

类型	说明
Promise	调用成功则返回是返回设置的结果，调用失败则返回error信息。

示例：

// source类型为string
let wallpaperPath = "/data/data/ohos.acts.aafwk.plrdtest.form/files/Cup_ic.jpg";
wallpaper.setWallpaper(wallpaperPath, wallpaper.WallpaperType.WALLPAPER_SYSTEM).then((data) => {
    console.log(`success to setWallpaper.`);
}).catch((error) => {
    console.error(`failed to setWallpaper because: ` + JSON.stringify(error));
});

代码实现

准备工作

准备一张图片放在rawfile文件目录，如下图所示

申请权限

在config.json注册如下权限代码如下

"reqPermissions": [
  {
    "name": "ohos.permission.READ_USER_STORAGE"
  },
  {
    "name": "ohos.permission.WRITE_USER_STORAGE"
  },
  {
    "name": "ohos.permission.SET_WALLPAPER"
  }
],

• 

在mainAbility注册申请权限，并把权限写入指定文件夹目录下，代码如下

package com.newdemo.myapplication;

import ohos.aafwk.content.Operation;
import ohos.ace.ability.AceAbility;
import ohos.aafwk.content.Intent;
import ohos.global.resource.RawFileEntry;
import ohos.global.resource.Resource;
import ohos.security.SystemPermission;

import java.io.File;
import java.io.FileOutputStream;
import java.io.IOException;

public class MainAbility extends AceAbility {
    @Override
    public void onStart(Intent intent) {
        String[] permissions = {
                "ohos.permission.WRITE_USER_STORAGE",
                "ohos.permission.READ_USER_STORAGE",
                " ohos.permission.SET_WALLPAPER"
        };
        requestPermissionsFromUser(permissions, 0);
        super.onStart(intent);



        writeToDisk( "entry/resources/rawfile/result.png","/result.png");
    }

    private void writeToDisk(String rawFilePath, String resultpath) {
        String externalFilePath = getFilesDir() +resultpath ;
        File file = new File(externalFilePath);
        if (file.exists()) {
            return;
        }
        RawFileEntry rawFileEntry = getResourceManager().getRawFileEntry(rawFilePath);
        try (FileOutputStream outputStream = new FileOutputStream(new File(externalFilePath))) {
            Resource resource = rawFileEntry.openRawFile();
            // cache length
            byte[] cache = new byte[1024];
            int len = resource.read(cache);
            while (len != -1) {
                outputStream.write(cache, 0, len);
                len = resource.read(cache);
            }
        } catch (IOException exception) {
        }
    }

}

• 

Ets语言实现

在Ets绘画一个text文本内容为：设置壁纸，然后实现点击功能，代码如下

import image from '@ohos.multimedia.image'
import wallpaper from '@ohos.wallpaper';
import featureAbility from '@ohos.ability.featureAbility'
@Entry
@Component
struct Mypage {
  public onclick() {

    var context = featureAbility.getContext();
    context.getFilesDir((err, data) => {
      if (err) {
        console.error('Operation failed. Cause: ' + JSON.stringify(err));
        return;
      }
      let wallpaperPath =data+"/result.png";
      wallpaper.setWallpaper(wallpaperPath, wallpaper.WallpaperType.WALLPAPER_SYSTEM, (error, data) => {
        if (error) {
          console.error(`failed to setWallpaper because: ` + JSON.stringify(error));
          return;
        }
        console.log(`success to setWallpaper.`);
      });
    });
  }

  build() {
    Flex({ direction: FlexDirection.Column, alignItems: ItemAlign.Center, justifyContent: FlexAlign.Center }) {
      Text('设置壁纸')
        .fontSize(50)
        .fontWeight(FontWeight.Bold)
        .onClick(this.onclick.bind(this))
    }
    .width('100%')
    .height('100%')
  }
}

• 

运行效果

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