//展示圖片
<Image
    ohos:id="$+id:show_photo"
    ohos:height="200fp"
    ohos:width="200fp"
    ohos:image_src="$media:empty"
    ohos:scale_mode="zoom_center"
    ohos:top_margin="30fp"
    /> 
 //選擇圖片     
<Text
    ohos:id="$+id:select_photo"
    ohos:height="match_content"
    ohos:width="match_content"
    ohos:background_element="$graphic:background_ability_main"
    ohos:layout_alignment="horizontal_center"
    ohos:text="選擇圖片"
    ohos:text_size="20vp"
    ohos:top_margin="10fp"
    />
  //保存圖片
<Text
    ohos:top_margin="10fp"
    ohos:id="$+id:save_photo"
    ohos:height="match_content"
    ohos:width="match_content"
    ohos:background_element="$graphic:background_ability_main"
    ohos:layout_alignment="horizontal_center"
    ohos:text="保存圖片"
    ohos:text_size="20vp"
    />

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

String[] permissions = {"ohos.permission.READ_USER_STORAGE", "ohos.permission.WRITE_USER_STORAGE"};
requestPermissionsFromUser(permissions, 0);

 //保存圖片到相冊(cè) fileName文件名  PixelMap 圖片數(shù)據(jù)
private void saveImageToLibrary(String fileName, PixelMap pixelMap) {
    try {
        ValuesBucket valuesBucket = new ValuesBucket();
        //文件名
        valuesBucket.putString(AVStorage.Images.Media.DISPLAY_NAME, fileName);
       //相對(duì)路徑
        valuesBucket.putString("relative_path", "DCIM/");
       //文件格式，類型要一定要注意要是JPEG，PNG類型不支持
        valuesBucket.putString(AVStorage.Images.Media.MIME_TYPE, "image/JPEG");
        //應(yīng)用獨(dú)占：is_pending設(shè)置為1時(shí)表示只有該應(yīng)用能訪問(wèn)此圖片，其他應(yīng)用無(wú)法發(fā)現(xiàn)該圖片，當(dāng)圖片處理操作完成后再吧is_pending設(shè)置為0，解除獨(dú)占，讓其他應(yīng)用可見
        valuesBucket.putInteger("is_pending", 1);       
      //鴻蒙的helper.insert方法和安卓的contentResolver.insert方法有所不同，安卓方法直接返回一個(gè)uri，我們就可以拿來(lái)直接操作，而鴻蒙方法返回官方描述是Returns the index of the inserted data record（返回插入的數(shù)據(jù)記錄的索引），這個(gè)index我的理解就是id，因此，我們需要自己在后面拼出文件的uri再進(jìn)行操作
        DataAbilityHelper helper = DataAbilityHelper.creator(this);
        int index = helper.insert(AVStorage.Images.Media.EXTERNAL_DATA_ABILITY_URI, valuesBucket);
        Uri uri = Uri.appendEncodedPathToUri(AVStorage.Images.Media.EXTERNAL_DATA_ABILITY_URI, String.valueOf(index));     
        //獲取到uri后，安卓通過(guò)contentResolver.openOutputStream(uri)就能獲取到輸出流來(lái)寫文件，而鴻蒙沒有提供這樣的方法，我們就只能通過(guò)uri獲取FileDescriptor，再通過(guò)FileDescriptor生成輸出流打包編碼成新的圖片文件，這里helper.openFile方法一定要有“w”寫模式，不然會(huì)報(bào)FileNotFound的錯(cuò)誤。
        FileDescriptor fd = helper.openFile(uri, "w");
        ImagePacker imagePacker = ImagePacker.create();
        ImagePacker.PackingOptions packingOptions = new ImagePacker.PackingOptions();
        OutputStream outputStream = new FileOutputStream(fd);
        packingOptions.format = "image/jpeg";
        packingOptions.quality = 90;
        boolean result = imagePacker.initializePacking(outputStream, packingOptions);
        if (result) {
            result = imagePacker.addImage(pixelMap);
            if (result) {
                long dataSize = imagePacker.finalizePacking();
            }
        }
        outputStream.flush();
        outputStream.close();
        valuesBucket.clear();
        //解除獨(dú)占
        valuesBucket.putInteger("is_pending", 0);
        helper.update(uri, valuesBucket, null);
    } catch (Exception e) {
        e.printStackTrace();
    }
}

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

String[] permissions = {"ohos.permission.READ_USER_STORAGE"};
requestPermissionsFromUser(permissions, 0);

//選擇圖片
 private void selectPhoto() {
        //調(diào)起系統(tǒng)的選擇來(lái)源數(shù)據(jù)視圖
        Intent intent = new Intent();
        Operation opt=new Intent.OperationBuilder().withAction("android.intent.action.GET_CONTENT").build();
        intent.setOperation(opt);
        intent.addFlags(Intent.FLAG_NOT_OHOS_COMPONENT);
        intent.setType("image/*");
        startAbilityForResult(intent, imgRequestCode);
    }

/*選擇圖片回調(diào)*/
@Override
protected void onAbilityResult(int requestCode, int resultCode, Intent resultData) {
    if(requestCode==imgRequestCode && resultData!=null)
    {
        //選擇的Img對(duì)應(yīng)的Uri
        String chooseImgUrl=resultData.getUriString();
        //定義數(shù)據(jù)能力幫助對(duì)象
        DataAbilityHelper helper=DataAbilityHelper.creator(getContext());
        //定義圖片來(lái)源對(duì)象
        ImageSource imageSource = null;
        //獲取選擇的Img對(duì)應(yīng)的Id
        String chooseImgId=null;
        //如果是選擇文件則getUriString結(jié)果為dataability:///com.android.providers.media.documents/document/image%3A437，其中%3A437是":"的URL編碼結(jié)果，后面的數(shù)字就是image對(duì)應(yīng)的Id
        //如果選擇的是圖庫(kù)則getUriString結(jié)果為dataability:///media/external/images/media/262，最后就是image對(duì)應(yīng)的Id
        //這里需要判斷是選擇了文件還是圖庫(kù)
        if(chooseImgUri.lastIndexOf("%3A")!=-1){
            chooseImgId = chooseImgUri.substring(chooseImgUri.lastIndexOf("%3A")+3);
        }
        else {
            chooseImgId = chooseImgUri.substring(chooseImgUri.lastIndexOf('/')+1);
        }
        //獲取圖片對(duì)應(yīng)的uri，由于獲取到的前綴是content，我們替換成對(duì)應(yīng)的dataability前綴
        Uri uri=Uri.appendEncodedPathToUri(AVStorage.Images.Media.EXTERNAL_DATA_ABILITY_URI,chooseImgId);
        try {
            //讀取圖片
            FileDescriptor fd = helper.openFile(uri, "r");
            imageSource = ImageSource.create(fd, null);
            //創(chuàng)建位圖
            PixelMap pixelMap = imageSource.createPixelmap(null);
            //設(shè)置圖片控件對(duì)應(yīng)的位圖
            photo.setPixelMap(pixelMap);
        } catch (Exception e) {
            e.printStackTrace();
        } finally {
            if (imageSource != null) {
                imageSource.release();
            }
        }
    }
}