Android默认锁屏界面按键处理流程分析

通过SystemUi的源码可以知道：
KeyguardHostView 是通过
StatusBarKeyguardViewManager.java这个类中的

public void registerStatusBar(PhoneStatusBar phoneStatusBar,        ViewGroup container, StatusBarWindowManager statusBarWindowManager,        ScrimController scrimController,        FingerprintUnlockController fingerprintUnlockController) {    mPhoneStatusBar = phoneStatusBar;    mContainer = container;    mStatusBarWindowManager = statusBarWindowManager;    mScrimController = scrimController;    mFingerprintUnlockController = fingerprintUnlockController;    mBouncer = new KeyguardBouncer(mContext, mViewMediatorCallback, mLockPatternUtils,            mStatusBarWindowManager, container);}

通过KeyguardBouncer.java 来加载的：

private void inflateView() {    if (DEBUG) {        Log.d(TAG, "inflateView() is called, we force to re-inflate the \"Bouncer\" view.");    }    removeView();    mRoot = (ViewGroup) LayoutInflater.from(mContext).inflate(R.layout.keyguard_bouncer, null);    mKeyguardView = (KeyguardHostView) mRoot.findViewById(R.id.keyguard_host_view);    mKeyguardView.setLockPatternUtils(mLockPatternUtils);    mKeyguardView.setViewMediatorCallback(mCallback);    mKeyguardView.setNotificationPanelView(mNotificationPanel) ;    mContainer.addView(mRoot, mContainer.getChildCount());    mRoot.setVisibility(View.INVISIBLE);    mRoot.setSystemUiVisibility(View.STATUS_BAR_DISABLE_HOME);}

所以锁屏状态下对按键处理的流程也是通过StatusBarKeyguardViewManager.java来处理的：

在StatusBarKeyguardViewManager中通过：

public boolean onMenuPressed() {    return mBouncer.onMenuPressed();}public boolean interceptMediaKey(KeyEvent event) {    return mBouncer.interceptMediaKey(event);}public boolean onBackPressed() {    Log.d(TAG, "onBackPressed()") ;    if (mBouncer.isShowing()) {        Log.d(TAG, "onBackPressed() - reset & return true") ;        reset();        ///M : fix ALPS01852958, clear mAfterKeyguardGoneAction when leaving bouncer.        mAfterKeyguardGoneAction = null ;        return true;    }    Log.d(TAG, "onBackPressed() - reset & return false") ;    return false;}

三个接口分别处理按键消息：
最终的按键处理在KeyguardHostView.java 中：

public boolean handleBackKey() {    if (mSecurityContainer.getCurrentSecuritySelection() != SecurityMode.None) {        mSecurityContainer.dismiss(false);        return true;    }    return false;}private boolean shouldEnableMenuKey() {    final Resources res = getResources();    final boolean configDisabled = res.getBoolean(R.bool.config_disableMenuKeyInLockScreen);    final boolean isTestHarness = ActivityManager.isRunningInTestHarness();    final boolean fileOverride = (new File(ENABLE_MENU_KEY_FILE)).exists();    /*SUN:jicong.wang add for pattern pin type disable {@*/    if (OptConfig.SUN_LOCK_DISABLE_MENUKEY){        SecurityMode securityMode = mSecurityContainer.getSecurityMode();        final boolean isLocktypeDisabled = (securityMode != KeyguardSecurityModel.SecurityMode.Pattern            && securityMode != KeyguardSecurityModel.SecurityMode.PIN            && securityMode != KeyguardSecurityModel.SecurityMode.Password);             if (isLocktypeDisabled){                return !configDisabled || isTestHarness || fileOverride;            } else {                return false;            }    } else     /*SUN:jicong.wang add for pattern pin type disable @}*/    return !configDisabled || isTestHarness || fileOverride;} public boolean interceptMediaKey(KeyEvent event) {        final int keyCode = event.getKeyCode();        if (event.getAction() == KeyEvent.ACTION_DOWN) {            switch (keyCode) {                case KeyEvent.KEYCODE_MEDIA_PLAY:                case KeyEvent.KEYCODE_MEDIA_PAUSE:                case KeyEvent.KEYCODE_MEDIA_PLAY_PAUSE:                    /* Suppress PLAY/PAUSE toggle when phone is ringing or                     * in-call to avoid music playback */                    if (mTelephonyManager == null) {                        mTelephonyManager = (TelephonyManager) getContext().getSystemService(                                Context.TELEPHONY_SERVICE);                    }                    if (mTelephonyManager != null &&                            mTelephonyManager.getCallState() != TelephonyManager.CALL_STATE_IDLE) {                        return true;  // suppress key event                    }                case KeyEvent.KEYCODE_MUTE:                case KeyEvent.KEYCODE_HEADSETHOOK:                case KeyEvent.KEYCODE_MEDIA_STOP:                case KeyEvent.KEYCODE_MEDIA_NEXT:                case KeyEvent.KEYCODE_MEDIA_PREVIOUS:                case KeyEvent.KEYCODE_MEDIA_REWIND:                case KeyEvent.KEYCODE_MEDIA_RECORD:                case KeyEvent.KEYCODE_MEDIA_FAST_FORWARD:                case KeyEvent.KEYCODE_MEDIA_AUDIO_TRACK: {                    handleMediaKeyEvent(event);                    return true;                }                case KeyEvent.KEYCODE_VOLUME_UP:                case KeyEvent.KEYCODE_VOLUME_DOWN:                case KeyEvent.KEYCODE_VOLUME_MUTE: {                    if (KEYGUARD_MANAGES_VOLUME) {                        synchronized (this) {                            if (mAudioManager == null) {                                mAudioManager = (AudioManager) getContext().getSystemService(                                        Context.AUDIO_SERVICE);                            }                        }                        // Volume buttons should only function for music (local or remote).                        // TODO: Actually handle MUTE.                        mAudioManager.adjustSuggestedStreamVolume(                                keyCode == KeyEvent.KEYCODE_VOLUME_UP                                        ? AudioManager.ADJUST_RAISE                                        : AudioManager.ADJUST_LOWER /* direction */,                                AudioManager.STREAM_MUSIC /* stream */, 0 /* flags */);                        // Don't execute default volume behavior                        return true;                    } else {                        return false;                    }                }            }        } else if (event.getAction() == KeyEvent.ACTION_UP) {            switch (keyCode) {                case KeyEvent.KEYCODE_MUTE:                case KeyEvent.KEYCODE_HEADSETHOOK:                case KeyEvent.KEYCODE_MEDIA_PLAY:                case KeyEvent.KEYCODE_MEDIA_PAUSE:                case KeyEvent.KEYCODE_MEDIA_PLAY_PAUSE:                case KeyEvent.KEYCODE_MEDIA_STOP:                case KeyEvent.KEYCODE_MEDIA_NEXT:                case KeyEvent.KEYCODE_MEDIA_PREVIOUS:                case KeyEvent.KEYCODE_MEDIA_REWIND:                case KeyEvent.KEYCODE_MEDIA_RECORD:                case KeyEvent.KEYCODE_MEDIA_FAST_FORWARD:                case KeyEvent.KEYCODE_MEDIA_AUDIO_TRACK: {                    handleMediaKeyEvent(event);                    return true;                }            }        }        return false;    }

最终通过以上对锁屏按键的处理。

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