81 lines
4.0 KiB
Markdown
81 lines
4.0 KiB
Markdown
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# WiFi Keep-Alive Feature
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## Overview
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This document describes the implementation of the WiFi keep-alive feature in the robot application. The feature prevents frequent WiFi disconnections by using Android's WifiLock mechanism to keep the WiFi radio awake even when the device is idle.
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## Implementation Details
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### WiFiKeepAliveManager
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The core component of this feature is the [WiFiKeepAliveManager](file:///d:/ismart_peng/source/robot/app/app/src/main/java/com/ismart/ib86/feature/network/WiFiKeepAliveManager.java#L12-L101) class, which manages the WifiLock lifecycle:
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1. **Initialization**: Acquires WifiManager and creates WifiLock
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2. **Network Monitoring**: Listens to network state changes using [NetworkStateMonitor](file:///d:/ismart_peng/source/robot/app/app/src/main/java/com/ismart/ib86/feature/network/NetworkStateMonitor.java#L15-L149)
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3. **WifiLock Management**: Acquires lock when WiFi is connected, releases when disconnected
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4. **Resource Cleanup**: Properly releases resources when destroyed
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### Integration
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The [WiFiKeepAliveManager](file:///d:/ismart_peng/source/robot/app/app/src/main/java/com/ismart/ib86/feature/network/WiFiKeepAliveManager.java#L12-L101) is integrated into the [MainActivity](file:///d:/ismart_peng/source/robot/app/app/src/main/java/com/ismart/ib86/app/MainActivity.java#L74-L1315) and is initialized during the application startup. It's destroyed when the application is terminated.
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### Permissions
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The following permissions were added to [AndroidManifest.xml](file:///d:/ismart_peng/source/robot/app/app/src/main/AndroidManifest.xml):
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```xml
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<uses-permission android:name="android.permission.WAKE_LOCK" />
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```
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The following permissions were already present:
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```xml
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<uses-permission android:name="android.permission.ACCESS_WIFI_STATE" />
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<uses-permission android:name="android.permission.CHANGE_WIFI_STATE" />
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```
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## Key Components
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### WiFiKeepAliveManager.java
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Located at: `app/src/main/java/com/ismart/ib86/feature/network/WiFiKeepAliveManager.java`
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Main methods:
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- `initialize()`: Sets up network state monitoring
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- `acquireWifiLock()`: Acquires the WiFi lock when WiFi is connected
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- `releaseWifiLock()`: Releases the WiFi lock when WiFi is disconnected
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- `destroy()`: Cleans up resources
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### Integration in MainActivity.java
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The [WiFiKeepAliveManager](file:///d:/ismart_peng/source/robot/app/app/src/main/java/com/ismart/ib86/feature/network/WiFiKeepAliveManager.java#L12-L101) is initialized in the [initNetworkStateManager()](file:///d:/ismart_peng/source/robot/app/app/src/main/java/com/ismart/ib86/app/MainActivity.java#L484-L492) method and destroyed in the `onDestroy()` method of [MainActivity](file:///d:/ismart_peng/source/robot/app/app/src/main/java/com/ismart/ib86/app/MainActivity.java#L74-L1315).
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## Testing
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A unit test class [WiFiKeepAliveManagerTest.java](file:///d:/ismart_peng/source/robot/app/app/src/test/java/com/ismart/ib86/feature/network/WiFiKeepAliveManagerTest.java) has been created to test the functionality:
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- Test creation of the manager
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- Test acquiring WiFi lock
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- Test releasing WiFi lock
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- Test destroying the manager
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Located at: `app/src/test/java/com/ismart/ib86/feature/network/WiFiKeepAliveManagerTest.java`
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## Benefits
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1. **Stable WiFi Connection**: Prevents frequent WiFi disconnections
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2. **Continuous Network Communication**: Ensures stable network connectivity for robot functionalities
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3. **Automatic Management**: Automatically acquires and releases WiFi lock based on network state
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4. **Resource Efficient**: Only holds WiFi lock when WiFi is connected
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## Performance Considerations
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1. **Battery Impact**: Using WifiLock will increase battery consumption as WiFi radio remains active
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2. **Optimization**: Only acquire WifiLock when WiFi is connected, release when disconnected
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3. **Android Version Compatibility**: Handles differences in WiFi management across Android versions
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## Error Handling
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The implementation includes proper error handling:
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- Handles cases where WifiLock cannot be acquired
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- Gracefully handles missing permissions
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- Logs errors for debugging and monitoring
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