【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：

返回值：

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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