Fix camera disambiguation in secure keyguard

When there are multiple activities that respond to MediaStore.INTENT_ACTION_STILL_IMAGE_CAMERA_SECURE
we need to show the disambiguation dialog to the user.  However the disambiguation "dialog"
is actully an activity themed as a dialog.  Hence, we can't show it in the secure keyguard.

This works around the issue by prompting the user for their credentials directly when the
intent needs disambiguation.  This will take them out of keyguard and prompt them for
which activity they want to use.

We'll provide a more robust solution in a future release.

Fixes bug 7109816

Change-Id: I94e643d3cb503e1ce6de24c82400b4d5fcbb9d95

Author: Jim Miller

core/java/com/android/internal/widget/LockPatternUtils.java

@@ -125,7 +125,9 @@ public class LockPatternUtils {
     private final ContentResolver mContentResolver;
     private DevicePolicyManager mDevicePolicyManager;
     private ILockSettings mLockSettingsService;
-    private int mCurrentUserId = UserHandle.USER_NULL;
+
+    // The current user is set by KeyguardViewMediator and shared by all LockPatternUtils.
+    private static volatile int sCurrentUserId = UserHandle.USER_NULL;
 
     public DevicePolicyManager getDevicePolicyManager() {
         if (mDevicePolicyManager == null) {
@@ -215,13 +217,13 @@ public void reportSuccessfulPasswordAttempt() {
     }
 
     public void setCurrentUser(int userId) {
-        mCurrentUserId = userId;
+        sCurrentUserId = userId;
     }
 
     public int getCurrentUser() {
-        if (mCurrentUserId != UserHandle.USER_NULL) {
+        if (sCurrentUserId != UserHandle.USER_NULL) {
             // Someone is regularly updating using setCurrentUser() use that value.
-            return mCurrentUserId;
+            return sCurrentUserId;
         }
         try {
             return ActivityManagerNative.getDefault().getCurrentUser().id;

policy/src/com/android/internal/policy/impl/keyguard/KeyguardFaceUnlockView.java

@@ -153,7 +153,8 @@ public void onUserSwitched(int userId) {
             if (mBiometricUnlock != null) {
                 mBiometricUnlock.stop();
             }
-            mLockPatternUtils.setCurrentUser(userId);
+            // No longer required; static value set by KeyguardViewMediator
+            // mLockPatternUtils.setCurrentUser(userId);
         }
     };
 

policy/src/com/android/internal/policy/impl/keyguard/KeyguardSelectorView.java

@@ -23,6 +23,8 @@
 import android.content.ComponentName;
 import android.content.Context;
 import android.content.Intent;
+import android.content.pm.PackageManager;
+import android.content.pm.ResolveInfo;
 import android.os.RemoteException;
 import android.os.UserHandle;
 import android.provider.MediaStore;
@@ -38,6 +40,8 @@
 import com.android.internal.widget.multiwaveview.GlowPadView.OnTriggerListener;
 import com.android.internal.R;
 
+import java.util.List;
+
 public class KeyguardSelectorView extends LinearLayout implements KeyguardSecurityView {
     private static final boolean DEBUG = KeyguardHostView.DEBUG;
     private static final String TAG = "SecuritySelectorView";
@@ -116,12 +120,39 @@ public KeyguardSelectorView(Context context) {
         this(context, null);
     }
 
+    private boolean wouldLaunchResolverActivity(Intent intent) {
+        PackageManager packageManager = mContext.getPackageManager();
+        ResolveInfo resolved = packageManager.resolveActivityAsUser(intent,
+                PackageManager.MATCH_DEFAULT_ONLY, mLockPatternUtils.getCurrentUser());
+        final List<ResolveInfo> appList = packageManager.queryIntentActivitiesAsUser(
+                intent, PackageManager.MATCH_DEFAULT_ONLY, mLockPatternUtils.getCurrentUser());
+        // If the list contains the above resolved activity, then it can't be
+        // ResolverActivity itself.
+        for (int i = 0; i < appList.size(); i++) {
+            ResolveInfo tmp = appList.get(i);
+            if (tmp.activityInfo.name.equals(resolved.activityInfo.name)
+                    && tmp.activityInfo.packageName.equals(resolved.activityInfo.packageName)) {
+                return false;
+            }
+        }
+        return true;
+    }
+
     protected void launchCamera() {
         if (mLockPatternUtils.isSecure()) {
             // Launch the secure version of the camera
-            Intent intent = new Intent(MediaStore.INTENT_ACTION_STILL_IMAGE_CAMERA_SECURE);
+            final Intent intent = new Intent(MediaStore.INTENT_ACTION_STILL_IMAGE_CAMERA_SECURE);
             intent.addFlags(Intent.FLAG_ACTIVITY_EXCLUDE_FROM_RECENTS);
-            launchActivity(intent, true);
+
+            if (wouldLaunchResolverActivity(intent)) {
+                // TODO: Show disambiguation dialog instead.
+                // For now, we'll treat this like launching any other app from secure keyguard.
+                // When they do, user sees the system's ResolverActivity which lets them choose
+                // which secure camera to use.
+                launchActivity(intent, false);
+            } else {
+                launchActivity(intent, true);
+            }
         } else {
             // Launch the normal camera
             launchActivity(new Intent(MediaStore.INTENT_ACTION_STILL_IMAGE_CAMERA), false);

policy/src/com/android/internal/policy/impl/keyguard/KeyguardViewMediator.java

@@ -907,6 +907,8 @@ public boolean isSecure() {
 
     /**
      * Update the newUserId. Call while holding WindowManagerService lock.
+     * NOTE: Should only be called by KeyguardViewMediator in response to the user id changing.
+     *
      * @param newUserId The id of the incoming user.
      */
     public void setCurrentUser(int newUserId) {