1自定义Dialog的布局1.1 问题描述如何实现自定义的Dialog?
1.2 实现方法添加自定义Dialog代码
CommonDialog commonDialog = new CommonDialog(this); Component component = LayoutScatter.getinstance(getContext()) .parse(ResourceTable.Layout_dialog_custom_layout, null, true); commonDialog.setSize(800, 500); commonDialog.setContentCustomComponent(component);commonDialog.show();自定义Dialog的布局文件
1.3 实际效果
2 设置控件背景颜色2.1 问题描述在xml布局中设置控件ohos:background_element="$color:yellow"无效,目前背景颜色不支持以$color方式设置,只支持$graphic方式设置。
2.2 实现方法方式1:xml中设置控件背景颜色使用$graphic
资源文件graphic中yellow.xml代码如下:
方式2:纯代码设置控件颜色
DirectionalLayout.LayoutConfig config = new DirectionalLayout.LayoutConfig(DirectionalLayout.LayoutConfig.MATCH_CONTENT, DirectionalLayout.LayoutConfig.MATCH_CONTENT);config.setMargins(30, 10, 10, 10); ShapeElement element = new ShapeElement();element.setRgbColor(new RgbColor(255, 111, 0));Text text = new Text(this);text.setText("xml添加背景");text.setTextColor(new Color(0xFFFFFFFF));text.setTextSize(40);text.setPadding(30, 20, 30, 20);text.setTextAlignment(TextAlignment.CENTER);text.setBackground(element);text.setLayoutConfig(config);2.3 实际效果
3 ScrollView嵌套DirectionalLayout进行滚动3.1 问题描述ScrollView嵌套DirectionalLayout如何进行滚动?
3.2 实现方法- 使用xml布局,需要将ScrollView的高度设置成“match_parent”,ScrollView子布局的高度设置成“match_content”
... - 使用代码添加,则需要给ScrollView和子布局设置LayoutConfig
ComponentContainer.LayoutConfig scrollConfig = new ComponentContainer.LayoutConfig(DirectionalLayout.LayoutConfig.MATCH_PARENT, DirectionalLayout.LayoutConfig.MATCH_PARENT);scrollView.setLayoutConfig(scrollConfig); DirectionalLayout.LayoutConfig config = new DirectionalLayout.LayoutConfig(DirectionalLayout.LayoutConfig.MATCH_PARENT, DirectionalLayout.LayoutConfig.MATCH_CONTENT); myLayout.setLayoutConfig(config); ... scrollView.addComponent(myLayout); super.setUIContent(scrollView); 3.3 实际效果
4 加载和显示网络图片4.1 问题描述如何实现加载和显示网络图片?
4.2 实现方法{ "module": { "reqPermissions": [ { "name": "ohos.permission.INTERNET" } ] }}String urlImage = "https://www.hARMonyos.com/resource/image/community/20201009-164134eSpace.jpg";HttpURLConnection connection = null; try { URL url = new URL(urlImage); URLConnection urlConnection = url.openConnection(); if (urlConnection instanceof HttpURLConnection) { connection = (HttpURLConnection) urlConnection; } if (connection != null) { connection.connect(); // 之后可进行url的其他操作 // 得到服务器返回过来的流对象 InputStream inputStream = urlConnection.getInputStream(); ImageSource imageSource = ImageSource.create(inputStream, new ImageSource.SourceOptions()); ImageSource.DecodingOptions decodingOptions = new ImageSource.DecodingOptions(); decodingOptions.desiredPixelFormat = PixelFormat.ARGB_8888; // 普通解码叠加旋转、缩放、裁剪 PixelMap pixelMap = imageSource.createPixelmap(decodingOptions); // 普通解码 getUITaskDispatcher().syncDispatch(() -> { Image image = new Image(HttpImageSlice.this); DirectionalLayout.LayoutConfig config = new DirectionalLayout.LayoutConfig(DirectionalLayout.LayoutConfig.MATCH_CONTENT, DirectionalLayout.LayoutConfig.MATCH_CONTENT); config.setMargins(10, 10, 10, 10); image.setLayoutConfig(config); image.setPixelMap(pixelMap); myLayout.addComponent(image); pixelMap.release(); }); }} catch (Exception e) { e.printStackTrace();}4.3 实际效果
5 ListContainer列表组件的使用5.1 问题描述ListContainer列表组件如何使用?
5.2 实现方法在xml文件中声明组件
获取 ListContainer 组件,并设置itemProvider
private void initView() {mListContainer = (ListContainer) findComponentById(ResourceTable.Id_list_container);ListItemProvider listItemProvider = new ListItemProvider();mListContainer.setItemProvider(listItemProvider);}自定义 ListItemProvider 继承 RecycleItemProvider
class ListItemProvider extends RecycleItemProvider { @Override public int getCount() { return data.size(); } @Override public long getItemId(int i) { return 0; } @Override public Component getComponent(int position, Component convertView, ComponentContainer componentContainer) { Component component = LayoutScatter.getInstance(getContext()) .parse(ResourceTable.Layout_layout_container_item, null, false); if (!(component instanceof ComponentContainer)) { return null; } ComponentContainer rootLayout = (ComponentContainer) component; Text rightText = (Text) rootLayout.findComponentById(ResourceTable.Id_content); rightText.setText(data.get(position)); return component; }}5.3 实际效果
6 读取资源文件6.1 问题描述如何读取应用的资源文件?
6.2 实现方法- 对于图片文件,建议放到base/media目录下,Image组件可以直接设置,方法如下。
Image image = (Image) findComponentById(ResourceTable.Id_component_image);image.setPixelMap(ResourceTable.Media_huawei);ohos.global.resource.ResourceManager resourceManager = getApplicationContext().getResourceManager();ohos.global.resource.RawFileEntry rawFileEntry = resourceManager.getRawFileEntry("resources/rawfile/test.png");RawFileDescriptor rawFileDescriptor = rawFileEntry.openRawFileDescriptor();// 或者Resource resource = rawFileEntry.openRawFile();6.3 实际效果
7 JS方法获取位置信息7.1 问题描述使用JS开发时,如何获取位置信息?
7.2 实现方法- 导入获取位置模块,并调用getLocation方法获取位置信息
import geolocation from '@system.geolocation';export default { data: { longitude: 0.0, latitude: 0.0 }, onInit() { this.getLocation(); }, getLocation() { var temp = this; geolocation.getLocation({ success: function(data) { console.info("get location success, longitude: " + data.longitude +", latitude: " + data.latitude); temp.longitude = data.longitude temp.latitude = data.latitude; }, fail: function(data, code) { console.error("get location failed, code: " + code + ", data: " + data); }, complete: function() { console.info("get location complete"); } }); }}"reqPermissions": [ { "name": "ohos.permission.LOCATION" }],7.3 实际效果
8 禁用手表中系统的左右滑动8.1 问题描述开发一个应用支持左右滑动的操作,但是在模拟器中右滑时,默认跳转到系统页面,并退出应用,如何禁用系统右滑?
8.2 实现方法覆盖MainAbility中的onTouchEvent方法,实现如下
@Overrideprotected boolean onTouchEvent(TouchEvent event) { super.onTouchEvent(event); return true;}8.3 实际效果9 Text控件中文字换行9.1 问题描述Text控件中文字目前不支持n换行,如何进行换行?
9.2 实现方法可以使用系统自动换行,保持两行文字长度一致,实现如下
9.3 实际效果
10 在一个布局xml中引入其他xml布局文件10.1 问题描述定义了一个公共的XML布局文件,如何在其他XML布局文件中引用这个公共的XML布局文件?
10.2 实现方法可以通过include标签引用其他的XML布局文件,示例如下:
10.3 实际效果NA
11 自定义Swtich控件的颜色11.1 问题描述如何自定义Swtich控件的开关两个状态下的按钮颜色?
11.2 实现方法在资源文件graphic文件下创建bg_element.xml和fg_element.xml,bg_element.xml文件内容如下
fg_element.xml文件内容如下
代码实现自定义颜色:
private void setupSwitch() { mSwitch = (Switch) findComponentById(ResourceTable.Id_switch_custom); Element elementBackground = ElementScatter.getInstance(this).parse(ResourceTable.Graphic_bg_element); mSwitch.setTrackElement(elementBackground); Element elementThumb = ElementScatter.getInstance(this).parse(ResourceTable.Graphic_fg_element); mSwitch.setThumbElement(elementThumb); mSwitch.setClickedListener(new Component.ClickedListener() { @Override public void onClick(Component component) { Log.i("switch: " + mSwitch.isChecked()); } });}11.3 实际效果
12 视频播放12.1 问题描述如何播放本地视频文件和网络视频?
12.2 实现方法创建布局文件video_player_layout.xml,内容如下
定义下面的变量,内容如下:
private static Player mPlayer;private SurfaceProvider mSurfaceProvider;private DependentLayout mLayout;实现SurfaceOps.Callback接口,代码如下:
class VideoSurfaceCallback implements SurfaceOps.Callback { @Override public void surfaceCreated(SurfaceOps surfaceOps) { Log.i("surfaceCreated() called."); if (mSurfaceProvider.getSurfaceOps().isPresent()) { Surface surface = mSurfaceProvider.getSurfaceOps().get().getSurface(); playUrl(surface); } } @Override public void surfaceChanged(SurfaceOps surfaceOps, int i, int i1, int i2) { Log.i("surfaceChanged() called."); } @Override public void surfaceDestroyed(SurfaceOps surfaceOps) { Log.i("surfaceDestroyed() called."); }}实现Player.IplayerCallback接口,代码如下:
private class VideoPlayerCallback implements Player.IPlayerCallback { @Override public void onPrepared() { Log.i("onPrepared"); } @Override public void onMessage(int i, int i1) { Log.i("onMessage"); } @Override public void onError(int i, int i1) { Log.i("onError: i=" + i + ", i1=" + i1); } @Override public void onResolutionChanged(int i, int i1) { Log.i("onResolutionChanged"); } @Override public void onPlayBackComplete() { Log.i("onPlayBackComplete"); if (mPlayer != null) { mPlayer.stop(); mPlayer = null; } } @Override public void onRewindToComplete() { Log.i("onRewindToComplete"); } @Override public void onBufferingChange(int i) { Log.i("onBufferingChange"); } @Override public void onNewTimedMetaData(Player.MediaTimedMetaData mediaTimedMetaData) { Log.i("onNewTimedMetaData"); } @Override public void onMediaTimeIncontinuity(Player.MediaTimeInfo mediaTimeInfo) { Log.i("onMediaTimeIncontinuity"); }}实现播放本地文件的方法,其中test.mp4文件放到资源文件目录下,内容如下:
private void playLocalFile(Surface surface) { try { RawFileDescriptor filDescriptor = getResourceManager().getRawFileEntry("resources/rawfile/test.mp4").openRawFileDescriptor(); Source source = new Source(filDescriptor.getFileDescriptor(),filDescriptor.getStartPosition(),filDescriptor.getFileSize()); mPlayer.setSource(source); mPlayer.setVideoSurface(surface); mPlayer.setPlayerCallback(new VideoPlayerCallback()); mPlayer.prepare(); mSurfaceProvider.setTop(0); mPlayer.play(); } catch (Exception e) { Log.e("playUrl Exception:" + e.getMessage()); }}实现播放网络URL的方法,其中video url为视频资源URL,内容如下:
private void playUrl(Surface surface) { try { Source source = new Source("video url"); mPlayer.setSource(source); mPlayer.setVideoSurface(surface); mPlayer.setPlayerCallback(new VideoPlayerCallback()); mPlayer.prepare(); mSurfaceProvider.setTop(0); mPlayer.play(); } catch (Exception e) { Log.e("playUrl Exception:" + e.getMessage()); }}播放网络视频,需要申请网络使用权限,在config.json中增加如下内容:
"reqPermissions": [ { "name": "ohos.permission.INTERNET" },]12.3 实际效果
原文链接:https://developer.huawei.com/consumer/cn/forum/topic/0204410755673870341?fid=0101303901040230869
原作者:eva3w
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