androidTV 获取蓝牙键值 传给 kenerl
时间: 2023-07-29 19:12:04 浏览: 59
要在 Android TV 上获取蓝牙键值并将其传递给内核,您需要执行以下步骤:
1. 在 Android TV 上设置蓝牙配对设备。
2. 创建一个 BroadcastReceiver 以接收蓝牙键值。
3. 在 BroadcastReceiver 中处理蓝牙键值,并将其传递给内核。
以下是一个示例 BroadcastReceiver:
```java
public class BluetoothReceiver extends BroadcastReceiver {
private static final String TAG = "BluetoothReceiver";
@Override
public void onReceive(Context context, Intent intent) {
String action = intent.getAction();
if (BluetoothAdapter.ACTION_STATE_CHANGED.equals(action)) {
int state = intent.getIntExtra(BluetoothAdapter.EXTRA_STATE, BluetoothAdapter.ERROR);
switch (state) {
case BluetoothAdapter.STATE_OFF:
Log.d(TAG, "Bluetooth off");
break;
case BluetoothAdapter.STATE_TURNING_OFF:
Log.d(TAG, "Turning Bluetooth off...");
break;
case BluetoothAdapter.STATE_ON:
Log.d(TAG, "Bluetooth on");
break;
case BluetoothAdapter.STATE_TURNING_ON:
Log.d(TAG, "Turning Bluetooth on...");
break;
}
} else if (BluetoothDevice.ACTION_KEY_EVENT.equals(action)) {
int keyCode = intent.getIntExtra(BluetoothDevice.EXTRA_KEY_CODE, -1);
if (keyCode != -1) {
// Do something with the key code, such as pass it to the kernel
}
}
}
}
```
您需要将此 BroadcastReceiver 注册到您的 Android TV 应用程序中,并使用 IntentFilter 指定要接收的蓝牙广播。例如,您可以在 onCreate() 方法中注册 BroadcastReceiver:
```java
IntentFilter filter = new IntentFilter();
filter.addAction(BluetoothAdapter.ACTION_STATE_CHANGED);
filter.addAction(BluetoothDevice.ACTION_KEY_EVENT);
registerReceiver(new BluetoothReceiver(), filter);
```
在 BroadcastReceiver 中,您可以处理蓝牙键值并将其传递给内核。为了将键值传递给内核,您需要使用 JNI 调用 C 函数,并将键值作为参数传递。例如:
```java
public class MyNativeLibrary {
static {
System.loadLibrary("my_native_library");
}
public static native void sendKeyEvent(int keyCode);
}
```
您需要在您的 C 代码中实现 sendKeyEvent() 函数,以便它能够将键值传递给内核。例如:
```c
JNIEXPORT void JNICALL Java_com_example_MyNativeLibrary_sendKeyEvent(JNIEnv *env, jobject obj, jint keyCode) {
// Send key event to kernel
}
```
这是一个简单的示例,您需要根据您的特定用例进行调整。