鸿蒙学习知识点总结（持续更新）

Media资源转element

public static PixelMapElement mediaResToPixel(Context context, int resId) {
    try {
        Resource resource = context.getResourceManager().getResource(resId);
        ImageSource source = ImageSource.create(resource, null);
        ImageSource.DecodingOptions opts = new ImageSource.DecodingOptions();
        opts.desiredSize = new Size(48,48);
        PixelMap pixelMap = source.createPixelmap(opts);
        return new PixelMapElement(pixelMap);
    } catch (IOException | NotExistException e) {
        e.printStackTrace();
    }
    return null;
}

ScrollView嵌套ListContainer

使用 Fraction

// 获取存储的状态，防止页面重叠
@Override
public void onRestoreAbilityState(PacMap inState) {
    super.onRestoreAbilityState(inState);
    int index = inState.getIntValue("stateTag", 0);
    changeFraction(index);
}

@Override
public void onSaveAbilityState(PacMap outState) {
    outState.putIntValue("stateTag", selectIndex);
    super.onSaveAbilityState(outState);
}

//隐藏Fraction
private void hideFraction(FractionScheduler fractionScheduler) {
    if (homeFraction != null) fractionScheduler.hide(homeFraction);
    if (matchFraction != null) fractionScheduler.hide(matchFraction);
    if (mineFraction != null) fractionScheduler.hide(mineFraction);
}

// 显示Fraction
private void changeFraction(int index) {
    selectIndex = index;
    FractionScheduler scheduler = fManager.startFractionScheduler();
    hideFraction(scheduler);
    switch (index) {
        case 0:
            if (homeFraction == null) {
                homeFraction = new HomeFraction();
                scheduler.add(ResourceTable.Id_fraction_main, homeFraction);
            } else {
                scheduler.show(homeFraction);
            }
            break;
        case 1:
            if (matchFraction == null) {
                matchFraction = new MatchFraction();
                scheduler.add(ResourceTable.Id_fraction_main, matchFraction);
            } else {
                scheduler.show(matchFraction);
            }
            break;
        case 2:
            if (mineFraction == null) {
                mineFraction = new MineFraction();
                scheduler.add(ResourceTable.Id_fraction_main, mineFraction);
            } else {
                scheduler.show(mineFraction);
            }
            break;
    }
    scheduler.submit();
}

隐藏默认 title

"metaData": {
      "customizeData": [
        {
          "name": "hwc-theme",
          "value": "androidhwext:style/Theme.Emui.Light.NoTitleBar"
        }
      ]
    }

设置沉浸式状态栏

getWindow().addFlags(WindowManager.LayoutConfig.MARK_TRANSLUCENT_STATUS);
WindowManager.getInstance().getTopWindow().get().addFlags(WindowManager.LayoutConfig.MARK_ALLOW_EXTEND_LAYOUT);

设置状态栏颜色

WindowManager.getInstance().getTopWindow().get().setStatusBarColor(Color.BLUE.getValue());

设置导航栏颜色

WindowManager.getInstance().getTopWindow().get().setNavigationBarColor(Color.GREEN.getValue());

设置沉浸式导航栏

在Ability或者 AbilitySlice中添加如下代码（有如下几种方式）：

getWindow().addFlags(WindowManager.LayoutConfig.MARK_TRANSLUCENT_NAVIGATION);
WindowManager.getInstance().getTopWindow().get().addFlags(WindowManager.LayoutConfig.FIRST_SYSTEM_WINDOW);
WindowManager.getInstance().getTopWindow().get().addFlags(WindowManager.LayoutConfig.MOD_STATUS_BAR);

设置显示状态栏

WindowManager.getInstance().getTopWindow().get().setStatusBarVisibility(Component.VISIBLE);

设置隐藏状态栏

getWindow().addFlags(WindowManager.LayoutConfig.MARK_FULL_SCREEN);
WindowManager.getInstance().getTopWindow().get().setStatusBarVisibility(Component.INVISIBLE);
WindowManager.getInstance().getTopWindow().get().addFlags(WindowManager.LayoutConfig.MARK_FULL_SCREEN);

获取屏幕宽度

public static int getDisplayWidthInPx(Context context) {
    Display display = DisplayManager.getInstance().getDefaultDisplay(context).get();
    Point point = new Point();
    display.getSize(point);
    return (int) point.getPointX();
}

获取屏幕高度，不包含状态栏的高度

public static float getDisplayHeightInPx(Context context) {
    Display display = DisplayManager.getInstance().getDefaultDisplay(context).get();
    Point point = new Point();
    display.getSize(point);
    return point.getPointY();
}

含状态栏的高度

private float getRealHeight(Context context) {
    Point point = new Point();
    DisplayManager.getInstance().getDefaultDisplay(context).get().getRealSize(point);
    float height = point.getPointY();
    return height;
}

修改输入框大小和样式

ohos:element_cursor_bubble="$graphic:ele_cursor_bubble"
ohos:bubble_height="$float:vp_10"
ohos:bubble_width="$float:vp_10"