Launcher 桌面源码笔记二

清水河 發表於 2025-10-27 13:28:00

车模桌面加载成功后，需要各种交互
<h4>切换桌面处理</h4>
先补充如何切换桌面，初始化需要指定一个默认桌面，初始化其实两个桌面都会一起加载，假设默认是车模桌面，地图将不会初始化操作，但是地图桌面会内嵌到Launcher中
两个桌面是互斥的，基于这种模式下，就需要隐藏另一个桌面，因为切换动效的缘故，这里直接使用setTranslationX移出屏幕外处理
为了让两个桌面互斥，需要通过 mActivityManager.moveTaskToFront(getTaskId(), 0) 方法让两个taskview内嵌的activity只能一个处于前台，另一个pause
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<pre>public void maybeBringEmbeddedTaskToForeground(int taskId) {
 if (taskId > 0) {
 // The task in TaskView should be in top to make it visible.
 // NOTE: Tried setTaskAlwaysOnTop before, the flag has some side effect to hinder
 // AccessibilityService from finding the correct window geometry: b/197247311
 mActivityManager.moveTaskToFront(taskId, /* flags= */ 0);
 }
}</pre>
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同时将两个taskview内嵌后，又单独处理了各自的生命周期，达到互斥效果
<h4>3D桌面跟Launcher通讯</h4>
这里3D桌面需要额外处理，因为3D有个通讯进程，需要监听底层信号对车模进行同步操作，而由于unity无法监听到底层信号，所以需要跟launcher进行跨进程通讯
所以在3D处于pause时，需要将通讯进程也暂停，否则信号会一直发送，并且3D也无法接受信号
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<pre>override fun setUnityVisible(visible: Boolean) {
 Log.w(TAG, "setUnityVisible:${visible}")
 val fragment = UnityPlayerFragment.Current
 if (fragment != null && fragment.isLoadUnityFinish) {
 lastVisibleFromLauncher3 = visible
 Log.w(TAG, "setUnityVisible:setInteractionMsg $visible")
 if (visible) {
 fragment.resumeUnityPlayer()
 } else {
 fragment.pauseUnityPlayer()
 }
 }
 }

}</pre>
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跨进程通讯接口
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<pre>package com.carlauncher;
import android.os.Bundle;
import com.carlauncher.IUnityBridgeCallback;

interface UnityInterface {

oneway void registerUnityBridgeCallback(IUnityBridgeCallback callback);
oneway void unregisterUnityBridgeCallback(IUnityBridgeCallback callback);

/**
* 通知Unity 交互信息传递
* 交互信息传输专用，除Adapter都放这里EX：车衣按钮被点击 | 天气信息传递（bx1e） | 其他
*
* @param msgType 消息类型
* @param msgData 消息
*/
oneway void setInteractionMsg(int msgType, in Bundle bundle);

/**
* 设置Unity是否处于显示状态
*/
oneway void setUnityVisible(boolean visible);

}</pre>
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在service中实现接口，通过setInteractionMsg方法跟unity车模交互通讯
<h5>通讯队列</h5>
信号不断的上报，需要缓存信号然后实时发送同步到3D，这里需要在子线程中不断轮询
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<pre>public class AutoPullExecutor<K, E> extends Thread {
private static final String TAG = "AutoPullExecutor";
private final FilterCache<K, E> mCache;
private final List<FilterCacheHelper.OnPullCacheCallback<K, E>> mCallbacks;
private boolean mIsRunning = false;

public AutoPullExecutor(FilterCache<K, E> cache) {
 mCache = cache;
 mCallbacks = new ArrayList<>();
}

@Override
public void run() {
 Log.d(TAG, "AutoPullExecutor is start");
 mIsRunning = true;
 while (mIsRunning) {
 FilterCache.Node<K, E> node = mCache.poll();

 if (node == null) {
 continue;
 }

 autoPullCallback(node);
 }
}

private void autoPullCallback(FilterCache.Node<K, E> node) {
 for (FilterCacheHelper.OnPullCacheCallback<K, E> callback : mCallbacks) {
 callback.onCache(node.key, node.element);
 }
}

void addPullCallback(FilterCacheHelper.OnPullCacheCallback<K, E> callback) {
 mCallbacks.add(callback);
}

boolean isRunning() {
 return mIsRunning;
}

void exit() {
 mIsRunning = false;
 interrupt();
 clear();
}

void clear() {
 mCallbacks.clear();
}
}</pre>
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注册好监听，需要发送信号时添加到缓存队列，轮询判断是否有需要发送的消息，发送完之后移除缓存
  
来源：https://www.cnblogs.com/LiuZhen/p/19168360

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Launcher 桌面源码笔记二