android4.0 hid插入提示

一时失言乱红尘 2022-08-06 05:08 55阅读 0赞

具体原理这里就不说了　我也没理顺　网上有很多文章都说的很清楚 这里我就直接上重点

主要修改文件

frameworks/base/service/java/com/android/server/usb/UsbService.java

frameworks/base/service/java/com/android/server/usb/UsbHostManager.java

首先将UsbService.java中的public UsbService(Context context)改为这样

public UsbService(Context context) {
            mContext = context;
            mSettingsManager = new UsbSettingsManager(context);
            PackageManager pm = mContext.getPackageManager();
            //if (pm.hasSystemFeature(PackageManager.FEATURE_USB_HOST)) {//modify by hclydao
                mHostManager = new UsbHostManager(context, mSettingsManager);
            //}
            if (new File("/sys/class/android_usb").exists()) {
                mDeviceManager = new UsbDeviceManager(context, mSettingsManager);
            }
        }

不然usbhostmanager不会执行

接下来主要就是修改usbhostmanager了 *当硬件usb host*插入里会执行usbhostmanager里的usbDeviceAdded函数　拔掉时会执行usbDeviceRemoved

当设备插入时在usb jni里会回调usbDeviceAdded函数　此时会传回这个usb设备的相关信息　但是发现class都是０　还好　在int \[\] interfaceValues传回了整个usb相关信息interfaceValues\[1\] 对应的就是相应的class 3对应的是usb hid 8对应的是mass storage 9对就的是usb hub　提示图片和信息直接使用系统自带的

最后修改为如下

/*
     * Copyright (C) 2011 The Android Open Source Project
     *
     * Licensed under the Apache License, Version 2.0 (the "License");
     * you may not use this file except in compliance with the License.
     * You may obtain a copy of the License at
     *
     *      http://www.apache.org/licenses/LICENSE-2.0
     *
     * Unless required by applicable law or agreed to in writing, software
     * distributed under the License is distributed on an "AS IS" BASIS,
     * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
     * See the License for the specific language governing permissions an
     * limitations under the License.
     */
    
    package com.android.server.usb;
    
    import android.app.PendingIntent;
    import android.content.BroadcastReceiver;
    import android.content.ContentResolver;
    import android.content.Context;
    import android.content.Intent;
    import android.content.IntentFilter;
    import android.hardware.usb.IUsbManager;
    import android.hardware.usb.UsbConstants;
    import android.hardware.usb.UsbDevice;
    import android.hardware.usb.UsbEndpoint;
    import android.hardware.usb.UsbInterface;
    import android.hardware.usb.UsbManager;
    import android.net.Uri;
    import android.os.Binder;
    import android.os.Bundle;
    import android.os.Handler;
    import android.os.Message;
    import android.os.Parcelable;
    import android.os.ParcelFileDescriptor;
    import android.os.UEventObserver;
    import android.provider.Settings;
    import android.util.Slog;
    
    import java.io.File;
    import java.io.FileDescriptor;
    import java.io.FileReader;
    import java.io.PrintWriter;
    import java.util.HashMap;
    import java.util.List;
    import android.app.Notification;
    import android.app.NotificationManager;
    import android.content.res.Resources;
    import java.util.ArrayList;
    /**
     * UsbHostManager manages USB state in host mode.
     */
    public class UsbHostManager {
        private static final String TAG = UsbHostManager.class.getSimpleName();
        private static final boolean LOG = false;
    
        // contains all connected USB devices
        private final HashMap<String,UsbDevice> mDevices = new HashMap<String,UsbDevice>();
    
        // USB busses to exclude from USB host support
        private final String[] mHostBlacklist;
    
        private final Context mContext;
        private final Object mLock = new Object();
        private final UsbSettingsManager mSettingsManager;
    	private Notification mUsbHostNotification;
    	private ArrayList<String> dlist;
        public UsbHostManager(Context context, UsbSettingsManager settingsManager) {
            mContext = context;
            mSettingsManager = settingsManager;
            mHostBlacklist = context.getResources().getStringArray(
                    com.android.internal.R.array.config_usbHostBlacklist);
        }
    
        private boolean isBlackListed(String deviceName) {
            int count = mHostBlacklist.length;
            for (int i = 0; i < count; i++) {
                if (deviceName.startsWith(mHostBlacklist[i])) {
                    return true;
                }
            }
            return false;
        }
    
        /* returns true if the USB device should not be accessible by applications */
        private boolean isBlackListed(int clazz, int subClass, int protocol) {
            // blacklist hubs
            if (clazz == UsbConstants.USB_CLASS_HUB) return true;
    
            // blacklist HID boot devices (mouse and keyboard)
            if (clazz == UsbConstants.USB_CLASS_HID &&
                    subClass == UsbConstants.USB_INTERFACE_SUBCLASS_BOOT) {
                return true;
            }
    
            return false;
        }
    
        /* Called from JNI in monitorUsbHostBus() to report new USB devices */
        private void usbDeviceAdded(String deviceName, int vendorID, int productID,
                int deviceClass, int deviceSubclass, int deviceProtocol,
                /* array of quintuples containing id, class, subclass, protocol
                   and number of endpoints for each interface */
                int[] interfaceValues,
               /* array of quadruples containing address, attributes, max packet size
                  and interval for each endpoint */
                int[] endpointValues) {
    		if((interfaceValues != null) && (interfaceValues[1] == UsbConstants.USB_CLASS_HID)) {//add by hclydao
                setUsbHostNotification(
                        com.android.internal.R.string.usb_storage_notification_title,
                        com.android.internal.R.string.usb_storage_notification_title,
                        com.android.internal.R.drawable.stat_sys_tether_usb, true, true, null);
    			if(dlist == null)
    				dlist = new ArrayList<String>();
    			dlist.add(deviceName);
    		}
            if (isBlackListed(deviceName) ||
                    isBlackListed(deviceClass, deviceSubclass, deviceProtocol)) {
                return;
            }
    
            synchronized (mLock) {
                if (mDevices.get(deviceName) != null) {
                    Slog.w(TAG, "device already on mDevices list: " + deviceName);
                    return;
                }
    
                int numInterfaces = interfaceValues.length / 5;
                Parcelable[] interfaces = new UsbInterface[numInterfaces];
                try {
                    // repackage interfaceValues as an array of UsbInterface
                    int intf, endp, ival = 0, eval = 0;
                    for (intf = 0; intf < numInterfaces; intf++) {
                        int interfaceId = interfaceValues[ival++];
                        int interfaceClass = interfaceValues[ival++];
                        int interfaceSubclass = interfaceValues[ival++];
                        int interfaceProtocol = interfaceValues[ival++];
                        int numEndpoints = interfaceValues[ival++];
    
                        Parcelable[] endpoints = new UsbEndpoint[numEndpoints];
                        for (endp = 0; endp < numEndpoints; endp++) {
                            int address = endpointValues[eval++];
                            int attributes = endpointValues[eval++];
                            int maxPacketSize = endpointValues[eval++];
                            int interval = endpointValues[eval++];
                            endpoints[endp] = new UsbEndpoint(address, attributes,
                                    maxPacketSize, interval);
                        }
    
                        // don't allow if any interfaces are blacklisted
                        if (isBlackListed(interfaceClass, interfaceSubclass, interfaceProtocol)) {
                            return;
                        }
                        interfaces[intf] = new UsbInterface(interfaceId, interfaceClass,
                                interfaceSubclass, interfaceProtocol, endpoints);
                    }
                } catch (Exception e) {
                    // beware of index out of bound exceptions, which might happen if
                    // a device does not set bNumEndpoints correctly
                    Slog.e(TAG, "error parsing USB descriptors", e);
                    return;
                }
    
                UsbDevice device = new UsbDevice(deviceName, vendorID, productID,
                        deviceClass, deviceSubclass, deviceProtocol, interfaces);
                mDevices.put(deviceName, device);
                mSettingsManager.deviceAttached(device);
            }
        }
    
        /* Called from JNI in monitorUsbHostBus to report USB device removal */
        private void usbDeviceRemoved(String deviceName) {
    		if(dlist != null) {
    			for(int i = 0;i<dlist.size();i++) {
    				if(dlist.get(i).equals(deviceName)) {
    					dlist.remove(i);
    /*
    				    setUsbHostNotification(
    				            com.android.internal.R.string.ext_media_nomedia_notification_title,
    				            com.android.internal.R.string.ext_media_nomedia_notification_message,
    				            com.android.internal.R.drawable.stat_sys_tether_usb,
    				            false, false, null);
    */
    					setUsbHostNotification(0, 0, 0, false, false, null);
    					break;
    				}
    			}
    		}
            synchronized (mLock) {
                UsbDevice device = mDevices.remove(deviceName);
                if (device != null) {
                    mSettingsManager.deviceDetached(device);
                }
            }		
        }
    
        public void systemReady() {
            synchronized (mLock) {
                // Create a thread to call into native code to wait for USB host events.
                // This thread will call us back on usbDeviceAdded and usbDeviceRemoved.
                Runnable runnable = new Runnable() {
                    public void run() {
                        monitorUsbHostBus();
                    }
                };
                new Thread(null, runnable, "UsbService host thread").start();
            }
        }
    
        /* Returns a list of all currently attached USB devices */
        public void getDeviceList(Bundle devices) {
            synchronized (mLock) {
                for (String name : mDevices.keySet()) {
                    devices.putParcelable(name, mDevices.get(name));
                }
            }
        }
    
        /* Opens the specified USB device */
        public ParcelFileDescriptor openDevice(String deviceName) {
            synchronized (mLock) {
                if (isBlackListed(deviceName)) {
                    throw new SecurityException("USB device is on a restricted bus");
                }
                UsbDevice device = mDevices.get(deviceName);
                if (device == null) {
                    // if it is not in mDevices, it either does not exist or is blacklisted
                    throw new IllegalArgumentException(
                            "device " + deviceName + " does not exist or is restricted");
                }
                mSettingsManager.checkPermission(device);
                return nativeOpenDevice(deviceName);
            }
        }
    
        public void dump(FileDescriptor fd, PrintWriter pw) {
            synchronized (mLock) {
                pw.println("  USB Host State:");
                for (String name : mDevices.keySet()) {
                    pw.println("    " + name + ": " + mDevices.get(name));
                }
            }
        }
    
        private synchronized void setUsbHostNotification(int titleId, int messageId, int icon, boolean visible,
                                                              boolean dismissable, PendingIntent pi) {
    
            if (!visible && mUsbHostNotification == null) {
                return;
            }
    
            NotificationManager notificationManager = (NotificationManager) mContext
                    .getSystemService(Context.NOTIFICATION_SERVICE);
    
            if (notificationManager == null) {
                return;
            }
    
            if (mUsbHostNotification != null && visible) {
                /*
                 * Dismiss the previous notification - we're about to
                 * re-use it.
                 */
                final int notificationId = mUsbHostNotification.icon;
                notificationManager.cancel(notificationId);
            }
            
            if (visible) {
                Resources r = Resources.getSystem();
                CharSequence title = r.getText(titleId);
                CharSequence message = r.getText(messageId);
    
                if (mUsbHostNotification == null) {
                    mUsbHostNotification = new Notification();
                    mUsbHostNotification.when = 0;
                }
    
                mUsbHostNotification.defaults &= ~Notification.DEFAULT_SOUND;
    
                if (dismissable) {
                    mUsbHostNotification.flags = Notification.FLAG_AUTO_CANCEL;
                } else {
                    mUsbHostNotification.flags = Notification.FLAG_ONGOING_EVENT;
                }
    
                mUsbHostNotification.tickerText = title;
                if (pi == null) {
                    Intent intent = new Intent();
                    pi = PendingIntent.getBroadcast(mContext, 0, intent, 0);
                }
    
                mUsbHostNotification.icon = icon;
                mUsbHostNotification.setLatestEventInfo(mContext, title, message, pi);
            }
        
            final int notificationId = mUsbHostNotification.icon;
            if (visible) {
                notificationManager.notify(notificationId, mUsbHostNotification);
            } else {
                notificationManager.cancel(notificationId);
            }
        }
    
        private native void monitorUsbHostBus();
        private native ParcelFileDescriptor nativeOpenDevice(String deviceName);
    }