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1. 认识Intent
Intent是对象之间传递信息的载体。
例如,当一个Ability需要启动另一个Ability时,或者一个AbilitySlice需要导航到另一个AbilitySlice时,可以通过Intent指定启动的目标同时携带相关数据。Intent的构成元素包括Operation与Parameters:
2. 了解AbilitySlice路由配置
虽然一个Page可以包含多个AbilitySlice,但是Page进入前台时界面默认只展示一个AbilitySlice。默认展示的AbilitySlice是通过setMainRoute()方法来指定的。当有多个需要展示的AbilitySlice,可以通过addActionRoute()方法为MainAbilitySlice以外的AbilitySlice配置路由规则。此时,当其他Page实例期望导航到这些AbilitySlice时,可以通过AbilitySlice之间的跳转,显示出这张页面。
- public class MyAbility extends Ability {
- @Override
- public void onStart(Intent intent) {
- super.onStart(intent);
- // set the main route
- setMainRoute(MainSlice.class.getName());
- // set the action route
- addActionRoute("action.pay", PaySlice.class.getName());
- addActionRoute("action.scan", ScanSlice.class.getName());
- }
- }
addActionRoute()方法中使用的动作命名,需要在应用配置文件(config.json)中注册:
- {
- "module": {
- "abilities": [
- {
- "skills":[
- {
- "actions":[
- "action.pay",
- "action.scan"
- ]
- }
- ]
- ...
- }
- ]
- ...
- }
- ...
- }
3. 同一个Page里的AbilitySlice1与AbilitySlice2间的跳转(无参,带参,回值)
1)无参数跳转
- @Override
- public void onStart(Intent intent) {
- super.onStart(intent);
- super.setUIContent(ResourceTable.Layout_ability_main);
- Text text = (Text)findComponentById(ResourceTable.Id_text_helloworld);
- text.setClickedListener(component->{
- Intent intent1 = new Intent();
- present(new MainAbilitySlice1(),intent1);
- });
- }
2)带参数跳转
(1)产生参数端的AbilitySlice
- @Override
- public void onStart(Intent intent) {
- super.onStart(intent);
- super.setUIContent(ResourceTable.Layout_ability_main);
- Text text = (Text)findComponentById(ResourceTable.Id_text_helloworld);
- text.setClickedListener(component->{
- //有参数跳转
- Intent intent1 = new Intent();
- intent1.setParam("user","钟发发");
- present(new MainAbilitySlice1(),intent1);
- });
- }
(2)接收参数端的AbilitySlice
- public class MainAbilitySlice1 extends AbilitySlice {
- Text text;
- String oldText;
- @Override
- public void onStart(Intent intent) {
- super.onStart(intent);
- super.setUIContent(ResourceTable.Layout_ability_main1);
- text = (Text) findComponentById(ResourceTable.Id_text_helloworld1);
- if(intent != null){
- String user = intent.getStringParam("user");
- oldText = text.getText();
- text.append("," + user);
- }
- }
- @Override
- protected void onInactive() {
- super.onInactive();
- }
- ....
- }
3)带参数跳转+返回值
(1)参数产生端
- public class MainAbilitySlice extends AbilitySlice {
- @Override
- public void onStart(Intent intent) {
- super.onStart(intent);
- super.setUIContent(ResourceTable.Layout_ability_main);
- Text text = (Text)findComponentById(ResourceTable.Id_text_helloworld);
- text.setClickedListener(component->{
- //有参数跳转
- Intent intent1 = new Intent();
- intent1.setParam("user","钟发发");
- presentForResult(new MainAbilitySlice1(),intent1,120);
- });
- }
- ...
- }
(2)参数接收端
- public class MainAbilitySlice1 extends AbilitySlice {
- Text text;
- String oldText;
- @Override
- public void onStart(Intent intent) {
- super.onStart(intent);
- super.setUIContent(ResourceTable.Layout_ability_main1);
- text = (Text) findComponentById(ResourceTable.Id_text_helloworld1);
- if(intent != null){
- String user = intent.getStringParam("user");
- oldText = text.getText();
- text.setText(oldText + "," + user);
- }
- //参数接收端在对文字点击
- text.setClickedListener(component -> {
- //1.给跳转来的页面返回值
- Intent intent1 = new Intent();
- intent1.setParam("password","123456");
- setResult(intent1);
- //2.接收本AbilityAlice,自动返回上一页
- terminate();
- });
- }
- @Override
- protected void onInactive() {
- super.onInactive();
- text.setText(oldText);
- }
- ...
- }
(3)回到参数产生端接收返回值
- public class MainAbilitySlice extends AbilitySlice {
- Text text;
- @Override
- public void onStart(Intent intent) {
- super.onStart(intent);
- super.setUIContent(ResourceTable.Layout_ability_main);
- text = (Text)findComponentById(ResourceTable.Id_text_helloworld);
- text.setClickedListener(component->{
- //有参数跳转
- Intent intent1 = new Intent();
- intent1.setParam("user","钟发发");
- presentForResult(new MainAbilitySlice1(),intent1,120);
- });
- }
- @Override
- protected void onResult(int requestCode, Intent resultIntent) {
- super.onResult(requestCode, resultIntent);
- if(requestCode==120){
- String password = resultIntent.getStringParam("password");
- text.setText("返回值:" + password);
- }
- }
- ...
- }
4. 不同的Page直接跳转,第一个鸿蒙应用例子写的就是这个,核心代码:
- if (button != null) {
- // 为按钮设置点击回调
- button.setClickedListener(new Component.ClickedListener() {
- @Override
- public void onClick(Component component) {
- Intent secondIntent = new Intent();
- // 指定待启动FA的bundleName和abilityName
- Operation operation = new Intent.OperationBuilder()
- .withDeviceId("")
- .withBundleName("com.example.myapplication")
- .withAbilityName("com.example.myapplication.SecondAbility")
- .build();
- secondIntent.setOperation(operation);
- startAbility(secondIntent); // 通过AbilitySlice的startAbility接口实现启动另一个页面
- }
- });
- }
5. Page1的MainAbilitySlice跳转Page2的AbilitySlice1
- @Override
- public void onStart(Intent intent) {
- super.onStart(intent);
- super.setUIContent(ResourceTable.Layout_ability_main);
- text = (Text)findComponentById(ResourceTable.Id_text_helloworld);
- text.setClickedListener(component->{
- Intent intent1 = new Intent();
- intent1.setAction("abilityslice1"); //关键是配置文件里配置action和Ability里注册路由
- startAbility(intent1);
- });
- }
文章内容已录制成视频课程《鸿蒙手机应用开发入门》https://edu.51cto.com/course/26133.html
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https://harmonyos.51cto.com/#zz