HarmonyOS鸿蒙如何实现跨设备画面同步

【2021-10-12】跨设备画面同步 1、【 授权代码：（config.json文件下） 】 "reqPermissions": [{"name": "ohos.permission.GET_DISTRIBUTED_DEVICE_INFO"},//授权获取设备信息       {"name": "ohos.permission.DISTRIBUTED_DATASYNC"}]//授权画面同步 2、【在MainAbility.java  文件下添加获取权限方法】 //申请权限 private void requestPermission(){ if (verifySelfPermission(SystemPermission.DISTRIBUTED_DATASYNC) != IBundleManager.PERMISSION_GRANTED){ requestPermissionsFromUser(new String[]{SystemPermission.DISTRIBUTED_DATASYNC},0); } } 3、【在MainAbilitySlice.java 文件下获取远程设备信息】 //获取远程设备信息 Button getIDBtn = (Button) findComponentById(ResourceTable.Id_getIDBtn); getIDBtn.setClickedListener(new Component.ClickedListener() { @Override public void onClick(Component component) { //获取同一网络下的其他设备信息 List deviceInfoList = DeviceManager.getDeviceList(DeviceInfo.FLAG_GET_ALL_DEVICE); System.out.println("共有"+deviceInfoList.size()+"台设备"); //循环当前对象 for(DeviceInfo deviceInfo:deviceInfoList){ System.out.println("设备ID"+deviceInfo.getDeviceId()); System.out.println("设备名称"+deviceInfo.getDeviceName()); System.out.println("设备类型"+deviceInfo.getDeviceType().name()); } } }); *【注意导入对应的包名】 4、【创建接口（在MainAbility.jav 和 MainAbilitySlice.java 两个文件 函数入口处）并生成4个接口方法】    询问是否同意授权 接口方法 5、【MainAbilitySlice.java文件下】声明两个全局变量 设置同步代码 在方法中添加获取数据的代码

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【实例代码】 ability_main.xml 文件 xml version="1.0" encoding="utf-8"?>

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MainAbility.java 文件 package com.example.myapplicationtest; import com.example.myapplicationtest.slice.MainAbilitySlice; import ohos.aafwk.ability.Ability; import ohos.aafwk.ability.IAbilityContinuation; import ohos.aafwk.content.Intent; import ohos.aafwk.content.IntentParams; import ohos.bundle.IBundleManager; import ohos.security.SystemPermission; //接口 public class MainAbility extends Ability implements IAbilityContinuation { @Override public void onStart(Intent intent) { super.onStart(intent); //询问是否同意获取权限 requestPermissions(); super.setMainRoute(MainAbilitySlice.class.getName()); } //申请权限 private void requestPermissions() { if (verifySelfPermission(SystemPermission.DISTRIBUTED_DATASYNC) != IBundleManager.PERMISSION_GRANTED){ requestPermissionsFromUser(new String[]{SystemPermission.DISTRIBUTED_DATASYNC},0); } } //继承接口的方法 将 false 改为 true @Override public boolean onStartContinuation() { return true; } @Override public boolean onSaveData(IntentParams intentParams) { return true; } @Override public boolean onRestoreData(IntentParams intentParams) { return true; } @Override public void onCompleteContinuation(int i) { } }

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MainAbilitySlice.java 文件 package com.example.myapplicationtest.slice; import com.example.myapplicationtest.ResourceTable; import ohos.aafwk.ability.AbilitySlice; import ohos.aafwk.ability.IAbilityContinuation; import ohos.aafwk.content.Intent; import ohos.aafwk.content.IntentParams; import ohos.agp.components.Button; import ohos.agp.components.Component; import ohos.agp.components.TextField; import ohos.distributedschedule.interwork.DeviceInfo; import ohos.distributedschedule.interwork.DeviceManager; import java.util.List; //接口 public class MainAbilitySlice extends AbilitySlice implements IAbilityContinuation { //声明变量 private TextField textField; private String showText; @Override public void onStart(Intent intent) { super.onStart(intent); super.setUIContent(ResourceTable.Layout_ability_main); //设置同步 textField = (TextField)findComponentById(ResourceTable.Id_text_helloworld); if(showText!=null){ textField.setText(showText); } //获取远程设备信息 Button getIDBtn = (Button) findComponentById(ResourceTable.Id_getIDBtn); getIDBtn.setClickedListener(new Component.ClickedListener() { @Override public void onClick(Component component) { //获取同一网络下的其他设备信息 List deviceInfoList = DeviceManager.getDeviceList(DeviceInfo.FLAG_GET_ALL_DEVICE); System.out.println("共有"+deviceInfoList.size()+"台设备"); //循环当前对象 for(DeviceInfo deviceInfo:deviceInfoList){ System.out.println("设备ID"+deviceInfo.getDeviceId()); System.out.println("设备名称"+deviceInfo.getDeviceName()); System.out.println("设备类型"+deviceInfo.getDeviceType().name()); } } }); Button movBtn = (Button) findComponentById(ResourceTable.Id_movID); movBtn.setClickedListener(new Component.ClickedListener() { @Override public void onClick(Component component) { continueAbility();//设备协同、同步 } }); } @Override public void onActive() { super.onActive(); } @Override public void onForeground(Intent intent) { super.onForeground(intent); } @Override public boolean onStartContinuation() { return true; } @Override public boolean onSaveData(IntentParams intentParams) { intentParams.setParam("text",textField.getText()); return true; } @Override public boolean onRestoreData(IntentParams intentParams) { showText = String .valueOf(intentParams.getParam("text")); return true; } @Override public void onCompleteContinuation(int i) { } }