USB: Add API and dialog for apps to request permissions for USB devices and accessories

New APIs:

UsbManager.hasPermission returns true if the caller has permission
for the given device or accessory

UsbManager.requestPermission poses a dialog to allow the user to give the caller
permission for the device or accessory.
Result is returned via a PendingIntent.
No dialog is displayed if the caller already has permission.

Also moved UsbResolverActivity to SystemUI package

BUG: 4069037

Change-Id: I93be769501a8776b49ac26e468af19f8fa2114c9

2 files changed, 114 insertions, 4 deletions

diff --git a/core/java/android/hardware/usb/IUsbManager.aidl b/core/java/android/hardware/usb/IUsbManager.aidl
index be65bdb..c79a458 100644
--- a/core/java/android/hardware/usb/IUsbManager.aidl
+++ b/core/java/android/hardware/usb/IUsbManager.aidl
@@ -16,6 +16,7 @@
 
 package android.hardware.usb;
 
+import android.app.PendingIntent;
 import android.hardware.usb.UsbAccessory;
 import android.hardware.usb.UsbDevice;
 import android.os.Bundle;
@@ -50,6 +51,25 @@ interface IUsbManager
      */
     void setAccessoryPackage(in UsbAccessory accessory, String packageName);
 
+    /* Returns true if the caller has permission to access the device. */
+    boolean hasDevicePermission(in UsbDevice device);
+
+    /* Returns true if the caller has permission to access the accessory. */
+    boolean hasAccessoryPermission(in UsbAccessory accessory);
+
+    /* Requests permission for the given package to access the device.
+     * Will display a system dialog to query the user if permission
+     * had not already been given.
+     */
+    void requestDevicePermission(in UsbDevice device, String packageName, in PendingIntent pi);
+
+    /* Requests permission for the given package to access the accessory.
+     * Will display a system dialog to query the user if permission
+     * had not already been given. Result is returned via pi.
+     */
+    void requestAccessoryPermission(in UsbAccessory accessory, String packageName,
+            in PendingIntent pi);
+
     /* Grants permission for the given UID to access the device */
     void grantDevicePermission(in UsbDevice device, int uid);
 
diff --git a/core/java/android/hardware/usb/UsbManager.java b/core/java/android/hardware/usb/UsbManager.java
index 6683179..9f1b8ea 100644
--- a/core/java/android/hardware/usb/UsbManager.java
+++ b/core/java/android/hardware/usb/UsbManager.java
@@ -17,6 +17,8 @@
 
 package android.hardware.usb;
 
+import android.app.PendingIntent;
+import android.content.Context;
 import android.os.Bundle;
 import android.os.ParcelFileDescriptor;
 import android.os.RemoteException;
@@ -176,12 +178,24 @@ public class UsbManager {
      */
     public static final String EXTRA_ACCESSORY = "accessory";
 
-    private IUsbManager mService;
+    /**
+     * Name of extra added to the {@link android.app.PendingIntent}
+     * passed into
+     * {#requestPermission(android.content.Context, android.hardware.usb.UsbDevice, android.app.PendingIntent)}
+     * or
+     * {#requestPermission(android.content.Context, android.hardware.usb.UsbAccessory, android.app.PendingIntent)}
+     * containing a boolean value indicating whether the user granted permission or not.
+     */
+    public static final String EXTRA_PERMISSION_GRANTED = "permission";
+
+    private final Context mContext;
+    private final IUsbManager mService;
 
     /**
      * {@hide}
      */
-    public UsbManager(IUsbManager service) {
+    public UsbManager(Context context, IUsbManager service) {
+        mContext = context;
         mService = service;
     }
 
@@ -245,7 +259,7 @@ public class UsbManager {
                 return new UsbAccessory[] { accessory };
             }
         } catch (RemoteException e) {
-            Log.e(TAG, "RemoteException in getAccessoryList" , e);
+            Log.e(TAG, "RemoteException in getAccessoryList", e);
             return null;
         }
     }
@@ -260,11 +274,87 @@ public class UsbManager {
         try {
             return mService.openAccessory(accessory);
         } catch (RemoteException e) {
-            Log.e(TAG, "RemoteException in openAccessory" , e);
+            Log.e(TAG, "RemoteException in openAccessory", e);
             return null;
         }
     }
 
+    /**
+     * Returns true if the caller has permission to access the device.
+     *
+     * @param device to check permissions for
+     * @return true if caller has permission
+     */
+    public boolean hasPermission(UsbDevice device) {
+        try {
+            return mService.hasDevicePermission(device);
+        } catch (RemoteException e) {
+            Log.e(TAG, "RemoteException in hasPermission", e);
+            return false;
+        }
+    }
+
+    /**
+     * Returns true if the caller has permission to access the accessory.
+     *
+     * @param accessory to check permissions for
+     * @return true if caller has permission
+     */
+    public boolean hasPermission(UsbAccessory accessory) {
+        try {
+            return mService.hasAccessoryPermission(accessory);
+        } catch (RemoteException e) {
+            Log.e(TAG, "RemoteException in hasPermission", e);
+            return false;
+        }
+    }
+
+    /**
+     * Requests permission for the given package to access the device.
+     * This may result in a system dialog being displayed to the user
+     * if permission had not already been granted.
+     * Success or failure is returned via the {@link android.app.PendingIntent} pi.
+     * The following extras will be added to pi:
+     * <ul>
+     * <li> {@link #EXTRA_DEVICE} containing the device passed into this call
+     * <li> {@link #EXTRA_PERMISSION_GRANTED} containing boolean indicating whether
+     * permission was granted by the user
+     * </ul>
+     *
+     * @param device to request permissions for
+     * @param pi PendingIntent for returning result
+     */
+    public void requestPermission(UsbDevice device, PendingIntent pi) {
+        try {
+            mService.requestDevicePermission(device, mContext.getPackageName(), pi);
+        } catch (RemoteException e) {
+            Log.e(TAG, "RemoteException in requestPermission", e);
+        }
+    }
+
+    /**
+     * Requests permission for the given package to access the accessory.
+     * This may result in a system dialog being displayed to the user
+     * if permission had not already been granted.
+     * Success or failure is returned via the {@link android.app.PendingIntent} pi.
+     * The following extras will be added to pi:
+     * <ul>
+     * <li> {@link #EXTRA_ACCESSORY} containing the accessory passed into this call
+     * <li> {@link #EXTRA_PERMISSION_GRANTED} containing boolean indicating whether
+     * permission was granted by the user
+     * </ul>
+     *
+     * @param accessory to request permissions for
+     * @param pi PendingIntent for returning result
+     */
+    public void requestPermission(UsbAccessory accessory, PendingIntent pi) {
+        try {
+            mService.requestAccessoryPermission(accessory, mContext.getPackageName(), pi);
+        } catch (RemoteException e) {
+            Log.e(TAG, "RemoteException in requestPermission", e);
+        }
+    }
+
     private static File getFunctionEnableFile(String function) {
         return new File("/sys/class/usb_composite/" + function + "/enable");
     }