我正在尝试为 Android 和 Ardunio 控制器之间的通信编写一个应用程序，但它不起作用。当我插入两个设备时，我的应用程序必须启动但它没有启动。我不知道问题出在哪里。我为附加设置了意图过滤器和广播。
对不起我的英语不好。
这是我的主菜：
<?xml version="1.0" encoding="utf-8"?>
<uses-feature android:name="android.hardware.usb.accessory" />
<application
android:allowBackup="true"
android:icon="@drawable/ic_launcher"
android:label="@string/app_name"
android:theme="@style/AppTheme" >
<activity
android:name=".BordActivity"
android:label="@string/app_name"
android:screenOrientation="landscape" >
<intent-filter>
<action android:name="android.intent.action.MAIN" />
<action android:name="android.hardware.usb.action.USB_ACCESSORY_ATTACHED" />
<category android:name="android.intent.category.LAUNCHER" />
</intent-filter>
<meta-data
android:name="android.hardware.usb.action.USB_ACCESSORY_ATTACHED"
android:resource="@xml/accessory_filter" />
</activity>
<activity
android:name=".MapActivity"
android:label="@string/title_activity_map"
android:screenOrientation="landscape" >
</activity>
</application>
<uses-permission android:name="android.permission.ACCESS_FINE_LOCATION" />
这是我的附件应用代码：
private final BroadcastReceiver mUsbReceiver = new BroadcastReceiver() {
@Override
public void onReceive(Context context, Intent intent) {
String action = intent.getAction();
if (ACTION_USB_PERMISSION.equals(action)) {
synchronized (this) {
UsbAccessory accessory = (UsbAccessory) intent.getParcelableExtra(UsbManager.EXTRA_ACCESSORY);
if (intent.getBooleanExtra(
UsbManager.EXTRA_PERMISSION_GRANTED, false)) {
openAccessory(accessory);
} else {
Log.d(TAG, "permission denied for accessory "
+ accessory);
}
mPermissionRequestPending = false;
}
} else if (UsbManager.ACTION_USB_ACCESSORY_DETACHED.equals(action)) {
UsbAccessory accessory = intent.getParcelableExtra(UsbManager.EXTRA_ACCESSORY);
if (accessory != null && accessory.equals(mAccessory)) {
closeAccessory();
}
}
}
};
@Override
public Object onRetainNonConfigurationInstance() {
if (mAccessory != null) {
return mAccessory;
} else {
return super.onRetainNonConfigurationInstance();
}
}
private void setupAccessory(){
//Reference to USB System Service
mUsbManager = (UsbManager) getSystemService(Context.USB_SERVICE);
//Ask for USB Permission when an Accessory connects
mPermissionIntent = PendingIntent.getBroadcast(this, 0, new Intent(
ACTION_USB_PERMISSION), 0);
IntentFilter filter = new IntentFilter(ACTION_USB_PERMISSION);
filter.addAction(UsbManager.ACTION_USB_ACCESSORY_DETACHED);
// Register the Receiver
registerReceiver(mUsbReceiver, filter);
if (getLastNonConfigurationInstance() != null) {
mAccessory = (UsbAccessory) getLastNonConfigurationInstance();
openAccessory(mAccessory);
}
}
private void openAccessory(UsbAccessory accessory) {
mFileDescriptor = mUsbManager.openAccessory(accessory);
if (mFileDescriptor != null) {
mAccessory = accessory;
FileDescriptor fd = mFileDescriptor.getFileDescriptor();
mInputStream = new FileInputStream(fd);
mOutputStream = new FileOutputStream(fd);
Thread thread = new Thread(null, this, "ChargeKit");
thread.start();
Log.d(TAG, "accessory opened");
} else {
Log.d(TAG, "accessory open fail");
}
}
private void closeAccessory() {
try {
if (mFileDescriptor != null) {
mFileDescriptor.close();
}
} catch (IOException e) {
} finally {
mFileDescriptor = null;
mAccessory = null;
}
}
@Override
public void run() {
int ret = 0;
byte[] buffer = new byte[16384]; //ByteArray Buffer with 16384 space.
int i;
while (true) {
try {
ret = mInputStream.read(buffer); //Read from mInputstream and stored in Buffer
} catch (IOException e) {
break;
}
i = 0;
while (i < ret) {
int len = ret - i;
if(len >=1){
Message m = Message.obtain(mHandler);
int value = (int) buffer[i];
m.obj = new ValueMsg(value);
mHandler.sendMessage(m);
}
i += 1; // number of bytes sent from arduino
}
}
}
Handler mHandler = new Handler()
{
public void handleMessage( Message msg){
final ValueMsg t = (ValueMsg) msg.obj;
mHandler.post(new Runnable() {
@Override
public void run() {
txt_range.setText(""+t.getReading());
txt_consumption.setText(""+t.getReading());
}
});
}
};
@Override
public void onDestroy() {
unregisterReceiver(mUsbReceiver);
super.onDestroy();
}
public class ValueMsg{
private int reading;
public ValueMsg(int reading){
this.reading = reading;
}
public int getReading(){
return reading;
}
}
这是一个 Arduino 文本程序：
#include <Max3421e.h>
#include <Usb.h>
#include <AndroidAccessory.h>
AndroidAccessory acc("FH-Frankfurt",
"ChargeKit",
"1.0");
void setup()
{
Serial.begin(115200);
acc.begin();
}
void loop()
{
byte msg[1]; // one byte
int value=10; // value to send,we'll increment and decrement this variable
if (acc.isConnected())
{
// is connected
while(value>0)
{
// count down
msg[0] = value;
acc.write(msg, 1);
delay(1000);
value-=1;
}
while(value<=10)
{
// count up+
msg[0] = value;
acc.write(msg, 1);
delay(1000);
value+=1;
}
}
}
附件过滤器：
<?xml version="1.0" encoding="utf-8"?>
<resources>
<usb-accessory model="ChargeKit" manufacturer="FH-Frankfurt" version="1.0"/>
</resources>