Android4.1中会被系统拦截的InputEent
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http://blog.csdn.net/siobhan/article/details/8132663
1. InputDispatcher::notifyKey
如果系统发现一个Event是KeyEvent, 会调用nofityKey去通知收到一个KeyEvent. 在notifyKey中会查看policy的策略。
mPolicy->interceptKeyBeforeQueueing(&event, /*byref*/ policyFlags); //mPolicy实际上就是 NativeInputManager。 当这个函数执行后会把对应的policy也设置到poicyFlags里面。
2. NativeInputManager::interceptKeyBeforeQueueing(const KeyEvent* keyEvent, uint32_t& policyFlags)
NativeInputManager是一个JNI类,自己不做什么工作,只是通过env->CallIntMethod(mServiceObj, gServiceClassInfo.interceptKeyBeforeQueueing, keyEventObj, policyFlags, isScreenOn); 去调用Java的interceptKeyBeforeQueueing方法。 实际上就是调用 InputManagerService.interceptKeyBeforeQueueing()
3. InputManagerService.interceptKeyBeforeQueueing()
- // Native callback.
- private int interceptKeyBeforeQueueing(KeyEvent event, int policyFlags, boolean isScreenOn) {
- return mCallbacks.interceptKeyBeforeQueueing(
- event, policyFlags, isScreenOn);
- }
4. InputMoniter.interceptKeyBeforeQueueing()
- /* Provides an opportunity for the window manager policy to intercept early key
- * processing as soon as the key has been read from the device. */
- public int interceptKeyBeforeQueueing(
- KeyEvent event, int policyFlags, boolean isScreenOn) {
- Slog.d("InputMonitor.java", "interceptKeyBeforeQueueing !!!!!!");
- return mService.mPolicy.interceptKeyBeforeQueueing(event, policyFlags, isScreenOn);
- }
5. mService.mPolicy.interceptKeyBeforeQueueing(event, policyFlags, isScreenOn);
- // Native callback.
- private int interceptKeyBeforeQueueing(KeyEvent event, int policyFlags, boolean isScreenOn) {
- Slog.d("InputManagerService.java", "interceptKeyBeforeQueueing !!!!!!!!!!!!!!");
- return mCallbacks.interceptKeyBeforeQueueing(
- event, policyFlags, isScreenOn);
- }
6. PhoneWindowManager.interceptKeyBeforeQueueing(KeyEvent event, int policyFlags, boolean isScreenOn)
代码很长,需要慢慢分析。
7. InputDispatcher::dispatchKeyLocked
当InputDispatcher::notifyKey 完成之后,InputDispatcher就会调用dispatchKeyLocked去做进一步的分配。
一个Event过来都是通过InputDispatcher进行分发的,在dispatchKeyLocked中会调用 InputDispatcher::doInterceptKeyBeforeDispatchingLockedInterruptible 去
- bool InputDispatcher::dispatchKeyLocked(nsecs_t currentTime, KeyEntry* entry,
- DropReason* dropReason, nsecs_t* nextWakeupTime) {
- // Preprocessing.
- // Give the policy a chance to intercept the key.
- if (entry->interceptKeyResult == KeyEntry::INTERCEPT_KEY_RESULT_UNKNOWN) {
- if (entry->policyFlags & POLICY_FLAG_PASS_TO_USER) {
- CommandEntry* commandEntry = postCommandLocked(
- & InputDispatcher::doInterceptKeyBeforeDispatchingLockedInterruptible);
- ... ...
- } else {
- entry->interceptKeyResult = KeyEntry::INTERCEPT_KEY_RESULT_CONTINUE;
- }
- } else if (entry->interceptKeyResult == KeyEntry::INTERCEPT_KEY_RESULT_SKIP) {
- ... ...
- }
- // Dispatch the key.
- dispatchEventLocked(currentTime, entry, inputTargets);
- return true;
- }
8. InputDispatcher::doInterceptKeyBeforeDispatchingLockedInterruptible
在这个函数中哦你依旧还是通过mPolicy(NativeInputManager)去通过JNI调用InputManagerService.
- void InputDispatcher::doInterceptKeyBeforeDispatchingLockedInterruptible(
- CommandEntry* commandEntry) {
- ... ...
- nsecs_t delay = mPolicy->interceptKeyBeforeDispatching(commandEntry->inputWindowHandle,
- &event, entry->policyFlags);
- mLock.lock();
- if (delay < 0) {
- entry->interceptKeyResult = KeyEntry::INTERCEPT_KEY_RESULT_SKIP;
- } else if (!delay) {
- entry->interceptKeyResult = KeyEntry::INTERCEPT_KEY_RESULT_CONTINUE;
- } else {
- entry->interceptKeyResult = KeyEntry::INTERCEPT_KEY_RESULT_TRY_AGAIN_LATER;
- entry->interceptKeyWakeupTime = now() + delay;
- }
- entry->release();
- }
9. NativeInputManager::interceptKeyBeforeDispatching
- nsecs_t NativeInputManager::interceptKeyBeforeDispatching(
- const sp<InputWindowHandle>& inputWindowHandle,
- const KeyEvent* keyEvent, uint32_t policyFlags) {
- // Policy:
- // - Ignore untrusted events and pass them along.
- // - Filter normal events and trusted injected events through the window manager policy to
- // handle the HOME key and the like.
- nsecs_t result = 0;
- if (policyFlags & POLICY_FLAG_TRUSTED) {
- jobject inputWindowHandleObj = getInputWindowHandleObjLocalRef(env, inputWindowHandle);
- jobject keyEventObj = android_view_KeyEvent_fromNative(env, keyEvent);
- if (keyEventObj) {
- jlong delayMillis = env->CallLongMethod(mServiceObj,
- gServiceClassInfo.interceptKeyBeforeDispatching,
- inputWindowHandleObj, keyEventObj, policyFlags);
- }
- env->DeleteLocalRef(inputWindowHandleObj);
- }
- return result;
- }
10. InputManagerService.intercepKeyBeforeDispatching()
- // Native callback.
- private long interceptKeyBeforeDispatching(InputWindowHandle focus,
- KeyEvent event, int policyFlags) {
- return mCallbacks.interceptKeyBeforeDispatching(focus, event, policyFlags);
- }
11. InputMonitor.interceptKeyBeforeDispatching()
- /* Provides an opportunity for the window manager policy to process a key before
- * ordinary dispatch. */
- public long interceptKeyBeforeDispatching(
- InputWindowHandle focus, KeyEvent event, int policyFlags) {
- Log.d("InputMonitor.java","interceptKeyBeforeDispatching !!!!!!");
- WindowState windowState = focus != null ? (WindowState) focus.windowState : null;
- return mService.mPolicy.interceptKeyBeforeDispatching(windowState, event, policyFlags);
- }
- public long interceptKeyBeforeDispatching(WindowState win, KeyEvent event, int policyFlags) {
- final boolean keyguardOn = keyguardOn();
- final int keyCode = event.getKeyCode();
- final int repeatCount = event.getRepeatCount();
- final int metaState = event.getMetaState();
- final int flags = event.getFlags();
- final boolean down = event.getAction() == KeyEvent.ACTION_DOWN;
- final boolean canceled = event.isCanceled();
- if (DEBUG_INPUT) {
- Log.d(TAG, "interceptKeyTi keyCode=" + keyCode + " down=" + down + " repeatCount="
- + repeatCount + " keyguardOn=" + keyguardOn + " mHomePressed=" + mHomePressed
- + " canceled=" + canceled);
- }
- // If we think we might have a volume down & power key chord on the way
- // but we're not sure, then tell the dispatcher to wait a little while and
- // try again later before dispatching.
- if (mScreenshotChordEnabled && (flags & KeyEvent.FLAG_FALLBACK) == 0) {
- if (mVolumeDownKeyTriggered && !mPowerKeyTriggered) {
- final long now = SystemClock.uptimeMillis();
- final long timeoutTime = mVolumeDownKeyTime + SCREENSHOT_CHORD_DEBOUNCE_DELAY_MILLIS;
- if (now < timeoutTime) {
- return timeoutTime - now;
- }
- }
- if (keyCode == KeyEvent.KEYCODE_VOLUME_DOWN
- && mVolumeDownKeyConsumedByScreenshotChord) {
- if (!down) {
- mVolumeDownKeyConsumedByScreenshotChord = false;
- }
- return -1;
- }
- }
- // First we always handle the home key here, so applications
- // can never break it, although if keyguard is on, we do let
- // it handle it, because that gives us the correct 5 second
- // timeout.
- if (keyCode == KeyEvent.KEYCODE_HOME) {
- // If we have released the home key, and didn't do anything else
- // while it was pressed, then it is time to go home!
- if (!down) {
- final boolean homeWasLongPressed = mHomeLongPressed;
- mHomePressed = false;
- mHomeLongPressed = false;
- if (!homeWasLongPressed) {
- try {
- IStatusBarService statusbar = getStatusBarService();
- if (statusbar != null) {
- statusbar.cancelPreloadRecentApps();
- }
- } catch (RemoteException e) {
- Slog.e(TAG, "RemoteException when showing recent apps", e);
- // re-acquire status bar service next time it is needed.
- mStatusBarService = null;
- }
- mHomePressed = false;
- if (!canceled) {
- // If an incoming call is ringing, HOME is totally disabled.
- // (The user is already on the InCallScreen at this point,
- // and his ONLY options are to answer or reject the call.)
- boolean incomingRinging = false;
- try {
- ITelephony telephonyService = getTelephonyService();
- if (telephonyService != null) {
- incomingRinging = telephonyService.isRinging();
- }
- } catch (RemoteException ex) {
- Log.w(TAG, "RemoteException from getPhoneInterface()", ex);
- }
- if (incomingRinging) {
- Log.i(TAG, "Ignoring HOME; there's a ringing incoming call.");
- } else {
- launchHomeFromHotKey(); //launch home
- }
- } else {
- Log.i(TAG, "Ignoring HOME; event canceled.");
- }
- return -1;
- }
- }
- // If a system window has focus, then it doesn't make sense
- // right now to interact with applications.
- WindowManager.LayoutParams attrs = win != null ? win.getAttrs() : null;
- if (attrs != null) {
- final int type = attrs.type;
- if (type == WindowManager.LayoutParams.TYPE_KEYGUARD
- || type == WindowManager.LayoutParams.TYPE_KEYGUARD_DIALOG) {
- // the "app" is keyguard, so give it the key
- return 0;
- }
- final int typeCount = WINDOW_TYPES_WHERE_HOME_DOESNT_WORK.length;
- for (int i=0; i<typeCount; i++) {
- if (type == WINDOW_TYPES_WHERE_HOME_DOESNT_WORK[i]) {
- // don't do anything, but also don't pass it to the app
- return -1;
- }
- }
- }
- if (down) {
- if (!mHomePressed && mLongPressOnHomeBehavior == LONG_PRESS_HOME_RECENT_SYSTEM_UI) {
- try {
- IStatusBarService statusbar = getStatusBarService();
- if (statusbar != null) {
- statusbar.preloadRecentApps();
- }
- } catch (RemoteException e) {
- Slog.e(TAG, "RemoteException when preloading recent apps", e);
- // re-acquire status bar service next time it is needed.
- mStatusBarService = null;
- }
- }
- if (repeatCount == 0) {
- mHomePressed = true;
- } else if ((event.getFlags() & KeyEvent.FLAG_LONG_PRESS) != 0) {
- if (!keyguardOn) {
- handleLongPressOnHome();
- }
- }
- }
- return -1;
- } else if (keyCode == KeyEvent.KEYCODE_MENU) {
- // Hijack modified menu keys for debugging features
- final int chordBug = KeyEvent.META_SHIFT_ON;
- if (down && repeatCount == 0) {
- if (mEnableShiftMenuBugReports && (metaState & chordBug) == chordBug) {
- Intent intent = new Intent(Intent.ACTION_BUG_REPORT);
- mContext.sendOrderedBroadcast(intent, null);
- return -1;
- } else if (SHOW_PROCESSES_ON_ALT_MENU &&
- (metaState & KeyEvent.META_ALT_ON) == KeyEvent.META_ALT_ON) {
- Intent service = new Intent();
- service.setClassName(mContext, "com.android.server.LoadAverageService");
- ContentResolver res = mContext.getContentResolver();
- boolean shown = Settings.System.getInt(
- res, Settings.System.SHOW_PROCESSES, 0) != 0;
- if (!shown) {
- mContext.startService(service);
- } else {
- mContext.stopService(service);
- }
- Settings.System.putInt(
- res, Settings.System.SHOW_PROCESSES, shown ? 0 : 1);
- return -1;
- }
- }
- } else if (keyCode == KeyEvent.KEYCODE_SEARCH) {
- if (down) {
- if (repeatCount == 0) {
- mSearchKeyShortcutPending = true;
- mConsumeSearchKeyUp = false;
- }
- } else {
- mSearchKeyShortcutPending = false;
- if (mConsumeSearchKeyUp) {
- mConsumeSearchKeyUp = false;
- return -1;
- }
- }
- return 0;
- } else if (keyCode == KeyEvent.KEYCODE_APP_SWITCH) {
- if (down && repeatCount == 0 && !keyguardOn) {
- showOrHideRecentAppsDialog(RECENT_APPS_BEHAVIOR_SHOW_OR_DISMISS);
- }
- return -1;
- } else if (keyCode == KeyEvent.KEYCODE_ASSIST) {
- if (down) {
- if (repeatCount == 0) {
- mAssistKeyLongPressed = false;
- } else if (repeatCount == 1) {
- mAssistKeyLongPressed = true;
- if (!keyguardOn) {
- launchAssistLongPressAction();
- }
- }
- } else {
- if (mAssistKeyLongPressed) {
- mAssistKeyLongPressed = false;
- } else {
- if (!keyguardOn) {
- launchAssistAction();
- }
- }
- }
- return -1;
- }
- // Shortcuts are invoked through Search+key, so intercept those here
- // Any printing key that is chorded with Search should be consumed
- // even if no shortcut was invoked. This prevents text from being
- // inadvertently inserted when using a keyboard that has built-in macro
- // shortcut keys (that emit Search+x) and some of them are not registered.
- if (mSearchKeyShortcutPending) {
- final KeyCharacterMap kcm = event.getKeyCharacterMap();
- if (kcm.isPrintingKey(keyCode)) {
- mConsumeSearchKeyUp = true;
- mSearchKeyShortcutPending = false;
- if (down && repeatCount == 0 && !keyguardOn) {
- Intent shortcutIntent = mShortcutManager.getIntent(kcm, keyCode, metaState);
- if (shortcutIntent != null) {
- shortcutIntent.addFlags(Intent.FLAG_ACTIVITY_NEW_TASK);
- try {
- mContext.startActivity(shortcutIntent);
- } catch (ActivityNotFoundException ex) {
- Slog.w(TAG, "Dropping shortcut key combination because "
- + "the activity to which it is registered was not found: "
- + "SEARCH+" + KeyEvent.keyCodeToString(keyCode), ex);
- }
- } else {
- Slog.i(TAG, "Dropping unregistered shortcut key combination: "
- + "SEARCH+" + KeyEvent.keyCodeToString(keyCode));
- }
- }
- return -1;
- }
- }
- // Invoke shortcuts using Meta.
- if (down && repeatCount == 0 && !keyguardOn
- && (metaState & KeyEvent.META_META_ON) != 0) {
- final KeyCharacterMap kcm = event.getKeyCharacterMap();
- if (kcm.isPrintingKey(keyCode)) {
- Intent shortcutIntent = mShortcutManager.getIntent(kcm, keyCode,
- metaState & ~(KeyEvent.META_META_ON
- | KeyEvent.META_META_LEFT_ON | KeyEvent.META_META_RIGHT_ON));
- if (shortcutIntent != null) {
- shortcutIntent.addFlags(Intent.FLAG_ACTIVITY_NEW_TASK);
- try {
- mContext.startActivity(shortcutIntent);
- } catch (ActivityNotFoundException ex) {
- Slog.w(TAG, "Dropping shortcut key combination because "
- + "the activity to which it is registered was not found: "
- + "META+" + KeyEvent.keyCodeToString(keyCode), ex);
- }
- return -1;
- }
- }
- }
- // Handle application launch keys.
- if (down && repeatCount == 0 && !keyguardOn) {
- String category = sApplicationLaunchKeyCategories.get(keyCode);
- if (category != null) {
- Intent intent = Intent.makeMainSelectorActivity(Intent.ACTION_MAIN, category);
- intent.setFlags(Intent.FLAG_ACTIVITY_NEW_TASK);
- try {
- mContext.startActivity(intent);
- } catch (ActivityNotFoundException ex) {
- Slog.w(TAG, "Dropping application launch key because "
- + "the activity to which it is registered was not found: "
- + "keyCode=" + keyCode + ", category=" + category, ex);
- }
- return -1;
- }
- }
- // Display task switcher for ALT-TAB or Meta-TAB.
- if (down && repeatCount == 0 && keyCode == KeyEvent.KEYCODE_TAB) {
- if (mRecentAppsDialogHeldModifiers == 0 && !keyguardOn) {
- final int shiftlessModifiers = event.getModifiers() & ~KeyEvent.META_SHIFT_MASK;
- if (KeyEvent.metaStateHasModifiers(shiftlessModifiers, KeyEvent.META_ALT_ON)
- || KeyEvent.metaStateHasModifiers(
- shiftlessModifiers, KeyEvent.META_META_ON)) {
- mRecentAppsDialogHeldModifiers = shiftlessModifiers;
- showOrHideRecentAppsDialog(RECENT_APPS_BEHAVIOR_EXIT_TOUCH_MODE_AND_SHOW);
- return -1;
- }
- }
- } else if (!down && mRecentAppsDialogHeldModifiers != 0
- && (metaState & mRecentAppsDialogHeldModifiers) == 0) {
- mRecentAppsDialogHeldModifiers = 0;
- showOrHideRecentAppsDialog(keyguardOn ? RECENT_APPS_BEHAVIOR_DISMISS :
- RECENT_APPS_BEHAVIOR_DISMISS_AND_SWITCH);
- }
- // Handle keyboard language switching.
- if (down && repeatCount == 0
- && (keyCode == KeyEvent.KEYCODE_LANGUAGE_SWITCH
- || (keyCode == KeyEvent.KEYCODE_SPACE
- && (metaState & KeyEvent.META_CTRL_MASK) != 0))) {
- int direction = (metaState & KeyEvent.META_SHIFT_MASK) != 0 ? -1 : 1;
- mWindowManagerFuncs.switchKeyboardLayout(event.getDeviceId(), direction);
- return -1;
- }
- if (mLanguageSwitchKeyPressed && !down
- && (keyCode == KeyEvent.KEYCODE_LANGUAGE_SWITCH
- || keyCode == KeyEvent.KEYCODE_SPACE)) {
- mLanguageSwitchKeyPressed = false;
- return -1;
- }
- // Let the application handle the key.
- return 0;
- }
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