android.content.Intent#CATEGORY_CAR_DOCK源码实例Demo

private void updateAfterBroadcastLocked(String action, int enableFlags, int disableFlags) {
    // Launch a dock activity
    String category = null;
    if (UiModeManager.ACTION_ENTER_CAR_MODE.equals(action)) {
        // Only launch car home when car mode is enabled and the caller
        // has asked us to switch to it.
        if (mEnableCarDockLaunch
                && (enableFlags & UiModeManager.ENABLE_CAR_MODE_GO_CAR_HOME) != 0) {
            category = Intent.CATEGORY_CAR_DOCK;
        }
    } else if (UiModeManager.ACTION_ENTER_DESK_MODE.equals(action)) {
        // Only launch car home when desk mode is enabled and the caller
        // has asked us to switch to it.  Currently re-using the car
        // mode flag since we don't have a formal API for "desk mode".
        if (ENABLE_LAUNCH_DESK_DOCK_APP
                && (enableFlags & UiModeManager.ENABLE_CAR_MODE_GO_CAR_HOME) != 0) {
            category = Intent.CATEGORY_DESK_DOCK;
        }
    } else {
        // Launch the standard home app if requested.
        if ((disableFlags & UiModeManager.DISABLE_CAR_MODE_GO_HOME) != 0) {
            category = Intent.CATEGORY_HOME;
        }
    }

    if (LOG) {
        Slog.v(TAG, String.format(
            "Handling broadcast result for action %s: enable=0x%08x, disable=0x%08x, "
                + "category=%s",
            action, enableFlags, disableFlags, category));
    }

    sendConfigurationAndStartDreamOrDockAppLocked(category);
}
 

void updateLocked(int enableFlags, int disableFlags) {
    String action = null;
    String oldAction = null;
    if (mLastBroadcastState == Intent.EXTRA_DOCK_STATE_CAR) {
        adjustStatusBarCarModeLocked();
        oldAction = UiModeManager.ACTION_EXIT_CAR_MODE;
    } else if (isDeskDockState(mLastBroadcastState)) {
        oldAction = UiModeManager.ACTION_EXIT_DESK_MODE;
    }

    if (mCarModeEnabled) {
        if (mLastBroadcastState != Intent.EXTRA_DOCK_STATE_CAR) {
            adjustStatusBarCarModeLocked();
            if (oldAction != null) {
                sendForegroundBroadcastToAllUsers(oldAction);
            }
            mLastBroadcastState = Intent.EXTRA_DOCK_STATE_CAR;
            action = UiModeManager.ACTION_ENTER_CAR_MODE;
        }
    } else if (isDeskDockState(mDockState)) {
        if (!isDeskDockState(mLastBroadcastState)) {
            if (oldAction != null) {
                sendForegroundBroadcastToAllUsers(oldAction);
            }
            mLastBroadcastState = mDockState;
            action = UiModeManager.ACTION_ENTER_DESK_MODE;
        }
    } else {
        mLastBroadcastState = Intent.EXTRA_DOCK_STATE_UNDOCKED;
        action = oldAction;
    }

    if (action != null) {
        if (LOG) {
            Slog.v(TAG, String.format(
                "updateLocked: preparing broadcast: action=%s enable=0x%08x disable=0x%08x",
                action, enableFlags, disableFlags));
        }

        // Send the ordered broadcast; the result receiver will receive after all
        // broadcasts have been sent. If any broadcast receiver changes the result
        // code from the initial value of RESULT_OK, then the result receiver will
        // not launch the corresponding dock application. This gives apps a chance
        // to override the behavior and stay in their app even when the device is
        // placed into a dock.
        Intent intent = new Intent(action);
        intent.putExtra("enableFlags", enableFlags);
        intent.putExtra("disableFlags", disableFlags);
        intent.addFlags(Intent.FLAG_RECEIVER_FOREGROUND);
        getContext().sendOrderedBroadcastAsUser(intent, UserHandle.CURRENT, null,
                mResultReceiver, null, Activity.RESULT_OK, null, null);

        // Attempting to make this transition a little more clean, we are going
        // to hold off on doing a configuration change until we have finished
        // the broadcast and started the home activity.
        mHoldingConfiguration = true;
        updateConfigurationLocked();
    } else {
        String category = null;
        if (mCarModeEnabled) {
            if (mEnableCarDockLaunch
                    && (enableFlags & UiModeManager.ENABLE_CAR_MODE_GO_CAR_HOME) != 0) {
                category = Intent.CATEGORY_CAR_DOCK;
            }
        } else if (isDeskDockState(mDockState)) {
            if (ENABLE_LAUNCH_DESK_DOCK_APP
                    && (enableFlags & UiModeManager.ENABLE_CAR_MODE_GO_CAR_HOME) != 0) {
                category = Intent.CATEGORY_DESK_DOCK;
            }
        } else {
            if ((disableFlags & UiModeManager.DISABLE_CAR_MODE_GO_HOME) != 0) {
                category = Intent.CATEGORY_HOME;
            }
        }

        if (LOG) {
            Slog.v(TAG, "updateLocked: null action, mDockState="
                    + mDockState +", category=" + category);
        }

        sendConfigurationAndStartDreamOrDockAppLocked(category);
    }

    // keep screen on when charging and in car mode
    boolean keepScreenOn = mCharging &&
            ((mCarModeEnabled && mCarModeKeepsScreenOn &&
              (mCarModeEnableFlags & UiModeManager.ENABLE_CAR_MODE_ALLOW_SLEEP) == 0) ||
             (mCurUiMode == Configuration.UI_MODE_TYPE_DESK && mDeskModeKeepsScreenOn));
    if (keepScreenOn != mWakeLock.isHeld()) {
        if (keepScreenOn) {
            mWakeLock.acquire();
        } else {
            mWakeLock.release();
        }
    }
}