1自定义Dialog的布局
1.1 问题形容
如何实现自定义的Dialog？
1.2 实现办法
增加自定义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
<?xml version="1.0" encoding="utf-8"?><DirectionalLayout xmlns:ohos="http://schemas.huawei.com/res/ohos" ohos:width="match_parent" ohos:height="match_content" ohos:padding="10vp" ohos:background_element="@graphic:grey" ohos:orientation="vertical"> <Text ohos:width="match_parent" ohos:height="match_content" ohos:text="Dialog题目" ohos:text_color="$color:Black" ohos:text_style="bold" ohos:text_size="40fp"/> <Text ohos:width="match_parent" ohos:height="match_parent" ohos:text="自定义Dialog内容" ohos:text_color="$color:Black" ohos:text_style="bold" ohos:weight="1" ohos:text_alignment="vertical_center" ohos:top_margin="30vp" ohos:bottom_margin="30vp" ohos:left_margin="10vp" ohos:right_margin="10vp" ohos:text_size="30fp"/> <DirectionalLayout ohos:height="match_content" ohos:width="match_parent" ohos:orientation="horizontal"> <Button ohos:width="match_parent" ohos:text="勾销" ohos:text_size="30fp" ohos:padding="10vp" ohos:text_color="$color:White" ohos:weight="1" ohos:margin="10vp" ohos:background_element="$graphic:yellow" ohos:height="match_content"/> <Button ohos:width="match_parent" ohos:text="确定" ohos:text_size="30fp" ohos:weight="1" ohos:padding="10vp" ohos:text_color="$color:White" ohos:margin="10vp" ohos:background_element="$graphic:green" ohos:height="match_content"/> </DirectionalLayout></DirectionalLayout>1.3 实际效果
2 设置控件背景色彩
2.1 问题形容
在xml布局中设置控件ohos:background_element="$color:yellow"有效，目前背景色彩不反对以$color形式设置，只反对$graphic形式设置。
2.2 实现办法
形式1：xml中设置控件背景色彩应用$graphic
<Button ohos:width="match_parent" ohos:text="控件按钮" ohos:text_size="30fp" ohos:padding="10vp" ohos:text_color="$color:White" ohos:background_element="$graphic:yellow" ohos:height="match_content"/>资源文件graphic中yellow.xml代码如下：
<?xml version="1.0" encoding="utf-8"?><shape xmlns:ohos="http://schemas.huawei.com/res/ohos" ohos:shape="rectangle"> <solid ohos:color="#fff9a825"/></shape>形式2：纯代码设置控件色彩
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增加背景");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 问题形容
ScrollView嵌套DirectionalLayout如何进行滚动？
3.2 实现办法
- 应用xml布局，须要将ScrollView的高度设置成“match_parent”，ScrollView子布局的高度设置成“match_content”
<?xml version="1.0" encoding="utf-8"?><ScrollView xmlns:ohos="http://schemas.huawei.com/res/ohos" ohos:width="match_parent" ohos:height="match_parent" ohos:orientation="vertical"> <DirectionalLayout xmlns:ohos="http://schemas.huawei.com/res/ohos" ohos:width="match_parent" ohos:height="match_content" ohos:orientation="vertical"> ... </DirectionalLayout></ScrollView>- 应用代码增加，则须要给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 问题形容
如何实现加载和显示网络图片？
4.2 实现办法
- 在config.json中增加网络权限
{ "module": { "reqPermissions": [ { "name": "ohos.permission.INTERNET" } ] }}- 获取并设置网络图片
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的其余操作 // 失去服务器返回过去的流对象 InputStream inputStream = urlConnection.getInputStream(); ImageSource imageSource = ImageSource.create(inputStream, new ImageSource.SourceOptions()); ImageSource.DecodingOptions decodingOptions = new ImageSource.DecodingOptions(); decodingOptions.desiredPixelFormat = PixelFormat.ARGB_8888; // 一般解码叠加旋转、缩放、裁剪 PixelMap pixelMap = imageSource.createPixelmap(decodingOptions); // 一般解码 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列表组件的应用
5.1 问题形容
ListContainer列表组件如何应用？
5.2 实现办法
在xml文件中申明组件
<?xml version="1.0" encoding="utf-8"?><DirectionalLayout xmlns:ohos="http://schemas.huawei.com/res/ohos" ohos:width="match_parent" ohos:height="match_parent" ohos:orientation="vertical"> <ListContainer ohos:id="$+id:list_container" ohos:orientation="vertical" ohos:width="match_parent" ohos:height="match_parent"/></DirectionalLayout>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 问题形容
如何读取利用的资源文件?
6.2 实现办法
- 对于图片文件，倡议放到base/media目录下，Image组件能够间接设置，办法如下。
Image image = (Image) findComponentById(ResourceTable.Id_component_image);image.setPixelMap(ResourceTable.Media_huawei);- 对于rawfile文件的读写，请参考上面的办法：
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办法获取地位信息
7.1 问题形容
应用JS开发时，如何获取地位信息？
7.2 实现办法
- 导入获取地位模块，并调用getLocation办法获取地位信息
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"); } }); }}- 在config.json中减少获取地位信息的权限
"reqPermissions": [ { "name": "ohos.permission.LOCATION" }],7.3 实际效果
8 禁用手表中零碎的左右滑动
8.1 问题形容
开发一个利用反对左右滑动的操作，然而在模拟器中右滑时，默认跳转到零碎页面，并退出利用，如何禁用零碎右滑？
8.2 实现办法
笼罩MainAbility中的onTouchEvent办法，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 问题形容
Text控件中文字目前不反对\n换行，如何进行换行？
9.2 实现办法
能够应用零碎主动换行，放弃两行文字长度统一，实现如下
<?xml version="1.0" encoding="utf-8"?><DirectionalLayout xmlns:ohos="http://schemas.huawei.com/res/ohos" ohos:width="match_parent" ohos:height="match_parent" ohos:orientation="vertical"> <Text ohos:id="$+id:text" ohos:width="150vp" ohos:height="match_content" ohos:multiple_lines="true" ohos:max_text_lines="2" ohos:auto_font_size="true" ohos:text="目前车辆尊享服务已过期, 车主续费后才可持续应用"/></DirectionalLayout>9.3 实际效果
10 在一个布局xml中引入其余xml布局文件
10.1 问题形容
定义了一个公共的XML布局文件，如何在其余XML布局文件中援用这个公共的XML布局文件？
10.2 实现办法
能够通过include标签援用其余的XML布局文件，示例如下：
<?xml version="1.0" encoding="utf-8"?><include ohos:id="$+id:include_layout" ohos:layout="$layout:include_layout" ohos:width="match_parent" ohos:height="match_content"/></DirectionalLayout>10.3 实际效果
NA
11 自定义Swtich控件的色彩
11.1 问题形容
如何自定义Swtich控件的开关两个状态下的按钮色彩？
11.2 实现办法
在资源文件graphic文件下创立bg_element.xml和fg_element.xml，bg_element.xml文件内容如下
<?xml version="1.0" encoding="utf-8"?><shape xmlns:ohos="http://schemas.huawei.com/res/ohos" ohos:shape="rectangle"> <corners ohos:radius="30"/> <solid ohos:color="#424242"/></shape>fg_element.xml文件内容如下
<?xml version="1.0" encoding="utf-8"?><shape xmlns:ohos="http://schemas.huawei.com/res/ohos" ohos:shape="oval"> <solid ohos:color="#D81B60"/></shape>代码实现自定义色彩：
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 问题形容
如何播放本地视频文件和网络视频？
12.2 实现办法
创立布局文件video_player_layout.xml，内容如下
<?xml version="1.0" encoding="utf-8"?><DependentLayout xmlns:ohos="http://schemas.huawei.com/res/ohos" ohos:id="$+id:video_player_dl" ohos:width="match_parent" ohos:height="match_parent" ohos:orientation="vertical"></DependentLayout>定义上面的变量，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办法，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的办法，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，须要申请网络应用权限，在config.json中减少如下内容：
"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