感谢关注HarmonyOS，为了便于大家学习特将鸿蒙2.0基础教学内容整理如下：
1、HarmonyOS应用开发—视频播放
https://developer.huawei.com/consumer/cn/codelab/HarmonyOS-hap1/index.html
2、HarmonyOS应用开发—基本控件
https://developer.huawei.com/consumer/cn/codelab/HarmonyOS-hap2/index.html
3、HarmonyOS应用开发—UI开发与预览
https://developer.huawei.com/consumer/cn/codelab/HarmonyOS-ui/index.html
4、HarmonyOS应用开发—设备虚拟化特性开发
https://developer.huawei.com/consumer/cn/codelab/HarmonyOS-screenhardware/index.html
5、HarmonyOS应用开发—HelloWorld应用开发E2E体验
https://developer.huawei.com/consumer/cn/codelab/HarmonyOS-HelloWorld/index.html
6、HarmonyOS应用开发—有界面元程序交互
https://developer.huawei.com/consumer/cn/codelab/HarmonyOS-hap6/index.html
7、HarmonyOS应用开发-分布式任务调度
https://developer.huawei.com/consumer/cn/codelab/HarmonyOS-hap5/index.html
8、HarmonyOS应用开发—剪切板
https://developer.huawei.com/consumer/cn/codelab/HarmonyOS-hap4/index.html
9、HarmonyOS应用开发—应用偏好数据读写
https://developer.huawei.com/consumer/cn/codelab/HarmonyOS-hap3/index.html
以下为HarmonyOS应用开发—基本控件节选部分，如想进一步了解，请点击：HarmonyOS应用开发—基本控件
HarmonyOS应用开发-基本控件
1、介绍
您将建立什么
在这个Codelab中，你将创建Demo Project，并将Demo编译成Hap，此示例应用程序展示了如何使用轻量级偏好数据库。
您将会学到什么
2. 您需要什么
硬件要求
软件要求
需要的知识点
3. 能力接入准备
实现HarmonyOS应用开发，需要完成以下准备工作：
具体操作，请按照《DevEco Studio使用指南》中详细说明来完成。
4. 代码片段
1. 布局：
布局代码：
LayoutConfig config = new LayoutConfig(LayoutConfig.MATCH_PARENT, LayoutConfig.MATCH_PARENT);
myLayout.setLayoutConfig(config);
myLayout.setOrientation(Component.VERTICAL);
ShapeElement element = new ShapeElement();
element.setRgbColor(new RgbColor(255, 255, 255));
myLayout.setBackground(element);
log = createText("日志信息");
myLayout.addComponent(log);
writeBtn = createBtn("写入preferences数据", new RgbColor(0, 0, 255), 1002);
readBtn = createBtn("读取preferences数据", new RgbColor(0, 0, 255), 1003);
addObserver = createBtn("注册观察者", new RgbColor(255, 0, 0), 1004);
private Text createText(String title) {
Text text = new Text(this);
DirectionalLayout.LayoutConfig config = new DirectionalLayout.LayoutConfig(DirectionalLayout.LayoutConfig.MATCH_CONTENT, DirectionalLayout.LayoutConfig.MATCH_CONTENT);
text.setLayoutConfig(config);
text.setText(title);
text.setTextSize(48);
text.setTextColor(new Color(0xFF0000FF));
return text;
}
private Button createBtn(String title, RgbColor color, int id) {
Button btn = new Button(this);
LayoutConfig configBtn = new LayoutConfig(500, 100);
configBtn.topMargin = 30;
btn.setLayoutConfig(configBtn);
btn.setText(title);
btn.setId(id);
btn.setTextSize(48);
btn.setTextColor(new Color(0xFFFFFFFF));
ShapeElement elementBtn = new ShapeElement();
elementBtn.setRgbColor(color);
elementBtn.setCornerRadius(12);
btn.setBackground(elementBtn);
myLayout.addComponent(btn);
return btn;
}
2. Preferences使用：
Preferences初始化
private void initPreferences() {
DatabaseHelper databaseHelper = new DatabaseHelper(this);
String fileName = "user_info";
preferences = databaseHelper.getPreferences(fileName);
}
写文件：
preferences.putInt("age", Integer.parseInt(age.getText()));
preferences.putString("name", name.getText());
preferences.flushSync();
读文件：
int age = preferences.getInt("age", 0);
String name = preferences.getString("name", "");
ToastDialog toastDialog = new ToastDialog(PreferencesAbilitySlice.this);
toastDialog.setText("read user data frome preferences name:" + name + ", age:" + age);
toastDialog.show();
观察者：
注册：
counter = new PreferencesChangeCounter(); preferences.registerObserver(counter);
private class PreferencesChangeCounter implements Preferences.PreferencesObserver {
@Override
public void onChange(Preferences preferences, String key) {
if ("name".equals(key)) {
String name = preferences.getString("name", "");
log.setText("user data name is edit:" + name);
}
if ("age".equals(key)) {
int age = preferences.getInt("age", 0);
log.setText("user data age is edit:" + age);
}
}
}
删除：
preferences.unregisterObserver(counter);
3. 响应遥控器点击
在zh-CN.json文件中写入：
private void addFocusChangedListener(Component view) {
view.setFocusChangedListener(new Component.FocusChangedListener() {
@Override
public void onFocusChange(Component component, boolean b) {
ShapeElement shapeElement = (ShapeElement) view.getBackgroundElement();
if (b) {
shapeElement.setStroke(10, new RgbColor(0, 0, 0));
focusView = view;
} else {
shapeElement.setStroke(0, new RgbColor(0, 0, 0));
}
}
});
}
@Override
public boolean onKeyUp(int keyCode, KeyEvent keyEvent) {
switch (keyCode) {
case KeyEvent.KEY_DPAD_CENTER:
case KeyEvent.KEY_ENTER:
if(focusView == writeBtn) {
preferences.putInt("age", index++);
preferences.putString("name", "张三");
preferences.flushSync();
}
if(focusView == readBtn) {
int age = preferences.getInt("age", 0);
String name = preferences.getString("name", "");
log.setText("read user data frome preferences name:" + name + ", age:" + age);
}
if(focusView == addObserver) {
if (addObserver.getText().equals("注册观察者")) {
addObserver.setText("删除观察者");
// 向preferences实例注册观察者
counter = new PreferencesChangeCounter();
preferences.registerObserver(counter);
} else {
addObserver.setText("注册观察者");
// 向preferences实例注销观察者
preferences.unregisterObserver(counter);
}
}
return true;
case KeyEvent.KEY_DPAD_UP:
int position = views.indexOf(focusView.getId());
if (position > 0) {
switch (position) {
case 1:
writeBtn.requestFocus();
break;
case 2:
readBtn.requestFocus();
break;
default:
break;
}
}
return true;
case KeyEvent.KEY_DPAD_DOWN:
position = views.indexOf(focusView.getId());
if (position < 3) {
switch (position) {
case 0:
readBtn.requestFocus();
break;
case 1:
addObserver.requestFocus();
break;
default:
break;
}
}
return true;
}
return false;
}
4.编译运行该应用
通过hdc连接大屏设备
先查看智慧屏IP：大屏设置->"网络与连接"->"网络"->"有线网络"
在cmd或者IDE的Terminal输入命令：
hdc tconn 192.168.3.9:5555
运行hap
提示：需要通过注册成开发者才能完成集成准备中的操作。
干得好
