http://blog.csdn.net/zimo2013/article/details/38950363
1.简介
最近做一个项目，主要通过usb完成pc与Android端的数据传输。但是根据api提供的无法监听usb的插拔，有解释为不同版本会存在BUG。本打算放弃跳过监听usb，改为在连上usb后pc点击按钮发出一个广播来主动打开Android端的应用程序，然后通过socket完成数据交互。这里主要通过UEventObserver，而该类位于/frameworks/base/core/java/android/os/UEventObserver.java中，位于framework框架。需要手动导入编译好的frameworks，下载frameworks.jar。
2.如何导入frameworks.jar
在工程的Build Path 中，Add External JARs中选择frameworks.jar，然后需要最好配置Order中将frameworks.jar置前，对于定制的frameworks也可以这样导入。
3.实现UEventObserver
public class MyService extends Service {
private final static String TAG = SMSService.class.getSimpleName();
private UsbUEventObserver usbObserver = null;
@Override
public IBinder onBind(Intent intent) {
return null;
}
@Override
public void onCreate() {
super.onCreate();
LogUtil.d(TAG, "onCreate()");
usbObserver = new UsbUEventObserver();
usbObserver.startObserving(USB_STATE_MATCH);
usbObserver.startObserving(ACCESSORY_START_MATCH);
}
public int onStartCommand(Intent intent, int flags, int startId) {
if (intent != null) {
//
}
return super.onStartCommand(intent, flags, startId);
}
@Override
public void onDestroy() {
LogUtil.d(TAG, "onDestroy()");
if (usbObserver != null) {
usbObserver.stopObserving();
}
super.onDestroy();
}
private static final String USB_STATE_MATCH = "DEVPATH=/devices/virtual/android_usb/android0";
private static final String ACCESSORY_START_MATCH = "DEVPATH=/devices/virtual/misc/usb_accessory";
private class UsbUEventObserver extends UEventObserver {
@Override
public void onUEvent(final UEventObserver.UEvent event) {
LogUtil.i(TAG, "usb:" + event.toString());
final String state = event.get("USB_STATE");
final String accessory = event.get("ACCESSORY");
if (state != null) {
// mHandler.updateState(state);
if (state.equalsIgnoreCase("CONNECTED")) {
Intent intent2 = new Intent(getApplicationContext(), MainActivity.class);
intent2.addFlags(Intent.FLAG_ACTIVITY_NEW_TASK);
getApplicationContext().startActivity(intent2);
BroadUtil.sendBroadcastConnected(getApplicationContext(),
Constants.ConnectedType.USB_CONNECTED);
} else if (state.toUpperCase().contains("DISCONNECTED")) {
BroadUtil.sendBroadcastConnected(getApplicationContext(),
Constants.ConnectedType.USB_DISCONNECTED);
}
} else if ("START".equals(accessory)) {
// startAccessoryMode();
}
}
};
}
4.附UsbDeviceManager源码
/**
* UsbDeviceManager manages USB state in device mode.
*/
public class UsbDeviceManager {
private static final String TAG = UsbDeviceManager.class.getSimpleName();
private static final boolean DEBUG = false;
private static final String USB_STATE_MATCH =
"DEVPATH=/devices/virtual/android_usb/android0";
private static final String ACCESSORY_START_MATCH =
"DEVPATH=/devices/virtual/misc/usb_accessory";
private static final String FUNCTIONS_PATH =
"/sys/class/android_usb/android0/functions";
private static final String STATE_PATH =
"/sys/class/android_usb/android0/state";
private static final String MASS_STORAGE_FILE_PATH =
"/sys/class/android_usb/android0/f_mass_storage/lun/file";
private static final String RNDIS_ETH_ADDR_PATH =
"/sys/class/android_usb/android0/f_rndis/ethaddr";
private static final int MSG_UPDATE_STATE = 0;
private static final int MSG_ENABLE_ADB = 1;
private static final int MSG_SET_CURRENT_FUNCTION = 2;
private static final int MSG_SYSTEM_READY = 3;
private static final int MSG_BOOT_COMPLETED = 4;
// Delay for debouncing USB disconnects.
// We often get rapid connect/disconnect events when enabling USB functions,
// which need debouncing.
private static final int UPDATE_DELAY = 1000;
private UsbHandler mHandler;
private boolean mBootCompleted;
private final Context mContext;
private final ContentResolver mContentResolver;
private final UsbSettingsManager mSettingsManager;
private NotificationManager mNotificationManager;
private final boolean mHasUsbAccessory;
private boolean mUseUsbNotification;
private boolean mAdbEnabled;
private class AdbSettingsObserver extends ContentObserver {
public AdbSettingsObserver() {
super(null);
}
@Override
public void onChange(boolean selfChange) {
boolean enable = (Settings.Secure.getInt(mContentResolver,
Settings.Secure.ADB_ENABLED, 0) > 0);
mHandler.sendMessage(MSG_ENABLE_ADB, enable);
}
}
/*
* Listens for uevent messages from the kernel to monitor the USB state
*/
private final UEventObserver mUEventObserver = new UEventObserver() {
@Override
public void onUEvent(UEventObserver.UEvent event) {
if (DEBUG) Slog.v(TAG, "USB UEVENT: " + event.toString());
String state = event.get("USB_STATE");
String accessory = event.get("ACCESSORY");
if (state != null) {
mHandler.updateState(state);
} else if ("START".equals(accessory)) {
if (DEBUG) Slog.d(TAG, "got accessory start");
setCurrentFunction(UsbManager.USB_FUNCTION_ACCESSORY, false);
}
}
};
public UsbDeviceManager(Context context, UsbSettingsManager settingsManager) {
mContext = context;
mContentResolver = context.getContentResolver();
mSettingsManager = settingsManager;
PackageManager pm = mContext.getPackageManager();
mHasUsbAccessory = pm.hasSystemFeature(PackageManager.FEATURE_USB_ACCESSORY);
initRndisAddress();
// create a thread for our Handler
HandlerThread thread = new HandlerThread("UsbDeviceManager",
Process.THREAD_PRIORITY_BACKGROUND);
thread.start();
mHandler = new UsbHandler(thread.getLooper());
if (nativeIsStartRequested()) {
if (DEBUG) Slog.d(TAG, "accessory attached at boot");
setCurrentFunction(UsbManager.USB_FUNCTION_ACCESSORY, false);
}
}
public void systemReady() {
if (DEBUG) Slog.d(TAG, "systemReady");
mNotificationManager = (NotificationManager)
mContext.getSystemService(Context.NOTIFICATION_SERVICE);
// We do not show the USB notification if the primary volume supports mass storage.
// The legacy mass storage UI will be used instead.
boolean massStorageSupported = false;
StorageManager storageManager = (StorageManager)
mContext.getSystemService(Context.STORAGE_SERVICE);
StorageVolume[] volumes = storageManager.getVolumeList();
if (volumes.length > 0) {
massStorageSupported = volumes[0].allowMassStorage();
}
mUseUsbNotification = !massStorageSupported;
// make sure the ADB_ENABLED setting value matches the current state
Settings.Secure.putInt(mContentResolver, Settings.Secure.ADB_ENABLED, mAdbEnabled ? 1 : 0);
mHandler.sendEmptyMessage(MSG_SYSTEM_READY);
}
private static void initRndisAddress() {
// configure RNDIS ethernet address based on our serial number using the same algorithm
// we had been previously using in kernel board files
final int ETH_ALEN = 6;
int address[] = new int[ETH_ALEN];
// first byte is 0x02 to signify a locally administered address
address[0] = 0x02;
String serial = SystemProperties.get("ro.serialno", "1234567890ABCDEF");
int serialLength = serial.length();
// XOR the USB serial across the remaining 5 bytes
for (int i = 0; i < serialLength; i++) {
address[i % (ETH_ALEN - 1) + 1] ^= (int)serial.charAt(i);
}
String addrString = String.format("%02X:%02X:%02X:%02X:%02X:%02X",
address[0], address[1], address[2], address[3], address[4], address[5]);
try {
FileUtils.stringToFile(RNDIS_ETH_ADDR_PATH, addrString);
} catch (IOException e) {
Slog.e(TAG, "failed to write to " + RNDIS_ETH_ADDR_PATH);
}
}
private static String addFunction(String functions, String function) {
if (!containsFunction(functions, function)) {
if (functions.length() > 0) {
functions += ",";
}
functions += function;
}
return functions;
}
private static String removeFunction(String functions, String function) {
String[] split = functions.split(",");
for (int i = 0; i < split.length; i++) {
if (function.equals(split[i])) {
split[i] = null;
}
}
StringBuilder builder = new StringBuilder();
for (int i = 0; i < split.length; i++) {
String s = split[i];
if (s != null) {
if (builder.length() > 0) {
builder.append(",");
}
builder.append(s);
}
}
return builder.toString();
}
private static boolean containsFunction(String functions, String function) {
int index = functions.indexOf(function);
if (index < 0) return false;
if (index > 0 && functions.charAt(index - 1) != ',') return false;
int charAfter = index + function.length();
if (charAfter < functions.length() && functions.charAt(charAfter) != ',') return false;
return true;
}
private final class UsbHandler extends Handler {
// current USB state
private boolean mConnected;
private boolean mConfigured;
private String mCurrentFunctions;
private String mDefaultFunctions;
private UsbAccessory mCurrentAccessory;
private int mUsbNotificationId;
private boolean mAdbNotificationShown;
private final BroadcastReceiver mBootCompletedReceiver = new BroadcastReceiver() {
public void onReceive(Context context, Intent intent) {
if (DEBUG) Slog.d(TAG, "boot completed");
mHandler.sendEmptyMessage(MSG_BOOT_COMPLETED);
}
};
public UsbHandler(Looper looper) {
super(looper);
try {
// persist.sys.usb.config should never be unset. But if it is, set it to "adb"
// so we have a chance of debugging what happened.
mDefaultFunctions = SystemProperties.get("persist.sys.usb.config", "adb");
// sanity check the sys.usb.config system property
// this may be necessary if we crashed while switching USB configurations
String config = SystemProperties.get("sys.usb.config", "none");
if (!config.equals(mDefaultFunctions)) {
Slog.w(TAG, "resetting config to persistent property: " + mDefaultFunctions);
SystemProperties.set("sys.usb.config", mDefaultFunctions);
}
mCurrentFunctions = mDefaultFunctions;
String state = FileUtils.readTextFile(new File(STATE_PATH), 0, null).trim();
updateState(state);
mAdbEnabled = containsFunction(mCurrentFunctions, UsbManager.USB_FUNCTION_ADB);
// Upgrade step for previous versions that used persist.service.adb.enable
String value = SystemProperties.get("persist.service.adb.enable", "");
if (value.length() > 0) {
char enable = value.charAt(0);
if (enable == '1') {
setAdbEnabled(true);
} else if (enable == '0') {
setAdbEnabled(false);
}
SystemProperties.set("persist.service.adb.enable", "");
}
// register observer to listen for settings changes
mContentResolver.registerContentObserver(
Settings.Secure.getUriFor(Settings.Secure.ADB_ENABLED),
false, new AdbSettingsObserver());
// Watch for USB configuration changes
mUEventObserver.startObserving(USB_STATE_MATCH);
mUEventObserver.startObserving(ACCESSORY_START_MATCH);
mContext.registerReceiver(mBootCompletedReceiver,
new IntentFilter(Intent.ACTION_BOOT_COMPLETED));
} catch (Exception e) {
Slog.e(TAG, "Error initializing UsbHandler", e);
}
}
public void sendMessage(int what, boolean arg) {
removeMessages(what);
Message m = Message.obtain(this, what);
m.arg1 = (arg ? 1 : 0);
sendMessage(m);
}
public void sendMessage(int what, Object arg) {
removeMessages(what);
Message m = Message.obtain(this, what);
m.obj = arg;
sendMessage(m);
}
public void sendMessage(int what, Object arg0, boolean arg1) {
removeMessages(what);
Message m = Message.obtain(this, what);
m.obj = arg0;
m.arg1 = (arg1 ? 1 : 0);
sendMessage(m);
}
public void updateState(String state) {
int connected, configured;
if ("DISCONNECTED".equals(state)) {
connected = 0;
configured = 0;
} else if ("CONNECTED".equals(state)) {
connected = 1;
configured = 0;
} else if ("CONFIGURED".equals(state)) {
connected = 1;
configured = 1;
} else {
Slog.e(TAG, "unknown state " + state);
return;
}
removeMessages(MSG_UPDATE_STATE);
Message msg = Message.obtain(this, MSG_UPDATE_STATE);
msg.arg1 = connected;
msg.arg2 = configured;
// debounce disconnects to avoid problems bringing up USB tethering
sendMessageDelayed(msg, (connected == 0) ? UPDATE_DELAY : 0);
}
private boolean waitForState(String state) {
// wait for the transition to complete.
// give up after 1 second.
for (int i = 0; i < 20; i++) {
// State transition is done when sys.usb.state is set to the new configuration
if (state.equals(SystemProperties.get("sys.usb.state"))) return true;
try {
// try again in 50ms
Thread.sleep(50);
} catch (InterruptedException e) {
}
}
Slog.e(TAG, "waitForState(" + state + ") FAILED");
return false;
}
private boolean setUsbConfig(String config) {
if (DEBUG) Slog.d(TAG, "setUsbConfig(" + config + ")");
// set the new configuration
SystemProperties.set("sys.usb.config", config);
return waitForState(config);
}
private void setAdbEnabled(boolean enable) {
if (DEBUG) Slog.d(TAG, "setAdbEnabled: " + enable);
if (enable != mAdbEnabled) {
mAdbEnabled = enable;
// Due to the persist.sys.usb.config property trigger, changing adb state requires
// switching to default function
setEnabledFunctions(mDefaultFunctions, true);
updateAdbNotification();
}
}
private void setEnabledFunctions(String functions, boolean makeDefault) {
if (functions != null && makeDefault) {
if (mAdbEnabled) {
functions = addFunction(functions, UsbManager.USB_FUNCTION_ADB);
} else {
functions = removeFunction(functions, UsbManager.USB_FUNCTION_ADB);
}
if (!mDefaultFunctions.equals(functions)) {
if (!setUsbConfig("none")) {
Slog.e(TAG, "Failed to disable USB");
// revert to previous configuration if we fail
setUsbConfig(mCurrentFunctions);
return;
}
// setting this property will also change the current USB state
// via a property trigger
SystemProperties.set("persist.sys.usb.config", functions);
if (waitForState(functions)) {
mCurrentFunctions = functions;
mDefaultFunctions = functions;
} else {
Slog.e(TAG, "Failed to switch persistent USB config to " + functions);
// revert to previous configuration if we fail
SystemProperties.set("persist.sys.usb.config", mDefaultFunctions);
}
}
} else {
if (functions == null) {
functions = mDefaultFunctions;
}
if (mAdbEnabled) {
functions = addFunction(functions, UsbManager.USB_FUNCTION_ADB);
} else {
functions = removeFunction(functions, UsbManager.USB_FUNCTION_ADB);
}
if (!mCurrentFunctions.equals(functions)) {
if (!setUsbConfig("none")) {
Slog.e(TAG, "Failed to disable USB");
// revert to previous configuration if we fail
setUsbConfig(mCurrentFunctions);
return;
}
if (setUsbConfig(functions)) {
mCurrentFunctions = functions;
} else {
Slog.e(TAG, "Failed to switch USB config to " + functions);
// revert to previous configuration if we fail
setUsbConfig(mCurrentFunctions);
}
}
}
}
private void updateCurrentAccessory() {
if (!mHasUsbAccessory) return;
if (mConfigured) {
String[] strings = nativeGetAccessoryStrings();
if (strings != null) {
mCurrentAccessory = new UsbAccessory(strings);
Slog.d(TAG, "entering USB accessory mode: " + mCurrentAccessory);
// defer accessoryAttached if system is not ready
if (mBootCompleted) {
mSettingsManager.accessoryAttached(mCurrentAccessory);
} // else handle in mBootCompletedReceiver
} else {
Slog.e(TAG, "nativeGetAccessoryStrings failed");
}
} else if (!mConnected) {
// make sure accessory mode is off
// and restore default functions
Slog.d(TAG, "exited USB accessory mode");
setEnabledFunctions(mDefaultFunctions, false);
if (mCurrentAccessory != null) {
if (mBootCompleted) {
mSettingsManager.accessoryDetached(mCurrentAccessory);
}
mCurrentAccessory = null;
}
}
}
private void updateUsbState() {
// send a sticky broadcast containing current USB state
Intent intent = new Intent(UsbManager.ACTION_USB_STATE);
intent.addFlags(Intent.FLAG_RECEIVER_REPLACE_PENDING);
intent.putExtra(UsbManager.USB_CONNECTED, mConnected);
intent.putExtra(UsbManager.USB_CONFIGURED, mConfigured);
if (mCurrentFunctions != null) {
String[] functions = mCurrentFunctions.split(",");
for (int i = 0; i < functions.length; i++) {
intent.putExtra(functions[i], true);
}
}
mContext.sendStickyBroadcast(intent);
}
@Override
public void handleMessage(Message msg) {
switch (msg.what) {
case MSG_UPDATE_STATE:
mConnected = (msg.arg1 == 1);
mConfigured = (msg.arg2 == 1);
updateUsbNotification();
updateAdbNotification();
if (containsFunction(mCurrentFunctions,
UsbManager.USB_FUNCTION_ACCESSORY)) {
updateCurrentAccessory();
}
if (!mConnected) {
// restore defaults when USB is disconnected
setEnabledFunctions(mDefaultFunctions, false);
}
if (mBootCompleted) {
updateUsbState();
}
break;
case MSG_ENABLE_ADB:
setAdbEnabled(msg.arg1 == 1);
break;
case MSG_SET_CURRENT_FUNCTION:
String function = (String)msg.obj;
boolean makeDefault = (msg.arg1 == 1);
setEnabledFunctions(function, makeDefault);
break;
case MSG_SYSTEM_READY:
updateUsbNotification();
updateAdbNotification();
updateUsbState();
break;
case MSG_BOOT_COMPLETED:
mBootCompleted = true;
if (mCurrentAccessory != null) {
mSettingsManager.accessoryAttached(mCurrentAccessory);
}
break;
}
}
public UsbAccessory getCurrentAccessory() {
return mCurrentAccessory;
}
private void updateUsbNotification() {
if (mNotificationManager == null || !mUseUsbNotification) return;
int id = 0;
Resources r = mContext.getResources();
if (mConnected) {
if (containsFunction(mCurrentFunctions, UsbManager.USB_FUNCTION_MTP)) {
id = com.android.internal.R.string.usb_mtp_notification_title;
} else if (containsFunction(mCurrentFunctions, UsbManager.USB_FUNCTION_PTP)) {
id = com.android.internal.R.string.usb_ptp_notification_title;
} else if (containsFunction(mCurrentFunctions,
UsbManager.USB_FUNCTION_MASS_STORAGE)) {
id = com.android.internal.R.string.usb_cd_installer_notification_title;
} else if (containsFunction(mCurrentFunctions, UsbManager.USB_FUNCTION_ACCESSORY)) {
id = com.android.internal.R.string.usb_accessory_notification_title;
} else {
// There is a different notification for USB tethering so we don't need one here
if (!containsFunction(mCurrentFunctions, UsbManager.USB_FUNCTION_RNDIS)) {
Slog.e(TAG, "No known USB function in updateUsbNotification");
}
}
}
if (id != mUsbNotificationId) {
// clear notification if title needs changing
if (mUsbNotificationId != 0) {
mNotificationManager.cancel(mUsbNotificationId);
mUsbNotificationId = 0;
}
if (id != 0) {
CharSequence message = r.getText(
com.android.internal.R.string.usb_notification_message);
CharSequence title = r.getText(id);
Notification notification = new Notification();
notification.icon = com.android.internal.R.drawable.stat_sys_data_usb;
notification.when = 0;
notification.flags = Notification.FLAG_ONGOING_EVENT;
notification.tickerText = title;
notification.defaults = 0; // please be quiet
notification.sound = null;
notification.vibrate = null;
Intent intent = Intent.makeRestartActivityTask(
new ComponentName("com.android.settings",
"com.android.settings.UsbSettings"));
PendingIntent pi = PendingIntent.getActivity(mContext, 0,
intent, 0);
notification.setLatestEventInfo(mContext, title, message, pi);
mNotificationManager.notify(id, notification);
mUsbNotificationId = id;
}
}
}
private void updateAdbNotification() {
if (mNotificationManager == null) return;
final int id = com.android.internal.R.string.adb_active_notification_title;
if (mAdbEnabled && mConnected) {
if ("0".equals(SystemProperties.get("persist.adb.notify"))) return;
if (!mAdbNotificationShown) {
Resources r = mContext.getResources();
CharSequence title = r.getText(id);
CharSequence message = r.getText(
com.android.internal.R.string.adb_active_notification_message);
Notification notification = new Notification();
notification.icon = com.android.internal.R.drawable.stat_sys_adb;
notification.when = 0;
notification.flags = Notification.FLAG_ONGOING_EVENT;
notification.tickerText = title;
notification.defaults = 0; // please be quiet
notification.sound = null;
notification.vibrate = null;
Intent intent = Intent.makeRestartActivityTask(
new ComponentName("com.android.settings",
"com.android.settings.DevelopmentSettings"));
PendingIntent pi = PendingIntent.getActivity(mContext, 0,
intent, 0);
notification.setLatestEventInfo(mContext, title, message, pi);
mAdbNotificationShown = true;
mNotificationManager.notify(id, notification);
}
} else if (mAdbNotificationShown) {
mAdbNotificationShown = false;
mNotificationManager.cancel(id);
}
}
public void dump(FileDescriptor fd, PrintWriter pw) {
pw.println(" USB Device State:");
pw.println(" Current Functions: " + mCurrentFunctions);
pw.println(" Default Functions: " + mDefaultFunctions);
pw.println(" mConnected: " + mConnected);
pw.println(" mConfigured: " + mConfigured);
pw.println(" mCurrentAccessory: " + mCurrentAccessory);
try {
pw.println(" Kernel state: "
+ FileUtils.readTextFile(new File(STATE_PATH), 0, null).trim());
pw.println(" Kernel function list: "
+ FileUtils.readTextFile(new File(FUNCTIONS_PATH), 0, null).trim());
pw.println(" Mass storage backing file: "
+ FileUtils.readTextFile(new File(MASS_STORAGE_FILE_PATH), 0, null).trim());
} catch (IOException e) {
pw.println("IOException: " + e);
}
}
}
/* returns the currently attached USB accessory */
public UsbAccessory getCurrentAccessory() {
return mHandler.getCurrentAccessory();
}
/* opens the currently attached USB accessory */
public ParcelFileDescriptor openAccessory(UsbAccessory accessory) {
UsbAccessory currentAccessory = mHandler.getCurrentAccessory();
if (currentAccessory == null) {
throw new IllegalArgumentException("no accessory attached");
}
if (!currentAccessory.equals(accessory)) {
String error = accessory.toString()
+ " does not match current accessory "
+ currentAccessory;
throw new IllegalArgumentException(error);
}
mSettingsManager.checkPermission(accessory);
return nativeOpenAccessory();
}
public void setCurrentFunction(String function, boolean makeDefault) {
if (DEBUG) Slog.d(TAG, "setCurrentFunction(" + function + ") default: " + makeDefault);
mHandler.sendMessage(MSG_SET_CURRENT_FUNCTION, function, makeDefault);
}
public void setMassStorageBackingFile(String path) {
if (path == null) path = "";
try {
FileUtils.stringToFile(MASS_STORAGE_FILE_PATH, path);
} catch (IOException e) {
Slog.e(TAG, "failed to write to " + MASS_STORAGE_FILE_PATH);
}
}
public void dump(FileDescriptor fd, PrintWriter pw) {
if (mHandler != null) {
mHandler.dump(fd, pw);
}
}
private native String[] nativeGetAccessoryStrings();
private native ParcelFileDescriptor nativeOpenAccessory();
private native boolean nativeIsStartRequested();
}
时间： 2024-10-12 09:21:02