先来说说LockScreen分类；
一、无锁屏；
二、锁屏：
1、UnLockScreen：
图案锁、 PIN锁， 密码锁；
2、LockScreen：
波纹锁；
转载请表明出处：http://blog.csdn.net/wdaming1986/article/details/7753206
有图有真相------>
接着我们来看看LockScreen的时序图：
综上所述：
1、createUnlockScreenFor（）方法创建的是UnLockScreen界面，代码如下：
View createUnlockScreenFor(UnlockMode unlockMode) { View unlockView = null; if (DEBUG) Log.d(TAG, "createUnlockScreenFor(" + unlockMode + "): mEnableFallback=" + mEnableFallback); if (unlockMode == UnlockMode.Pattern) { PatternUnlockScreen view = new PatternUnlockScreen( mContext, mConfiguration, mLockPatternUtils, mUpdateMonitor, mKeyguardScreenCallback, mUpdateMonitor.getFailedAttempts()); view.setEnableFallback(mEnableFallback); unlockView = view; } else if (unlockMode == UnlockMode.SimPuk) { unlockView = new SimPukUnlockScreen( mContext, mConfiguration, mUpdateMonitor, mKeyguardScreenCallback, mLockPatternUtils, MSimTelephonyManager.getDefault().getDefaultSubscription()); } else if (unlockMode == UnlockMode.SimPin) { unlockView = new SimUnlockScreen( mContext, mConfiguration, mUpdateMonitor, mKeyguardScreenCallback, mLockPatternUtils); } else if (unlockMode == UnlockMode.Account) { try { unlockView = new AccountUnlockScreen( mContext, mConfiguration, mUpdateMonitor, mKeyguardScreenCallback, mLockPatternUtils); } catch (IllegalStateException e) { Log.i(TAG, "Couldn't instantiate AccountUnlockScreen" + " (IAccountsService isn't available)"); // TODO: Need a more general way to provide a // platform-specific fallback UI here. // For now, if we can't display the account login // unlock UI, just bring back the regular "Pattern" unlock mode. // (We do this by simply returning a regular UnlockScreen // here. This means that the user will still see the // regular pattern unlock UI, regardless of the value of // mUnlockScreenMode or whether or not we're in the // "permanently locked" state.) return createUnlockScreenFor(UnlockMode.Pattern); } } else if (unlockMode == UnlockMode.Password) { unlockView = new PasswordUnlockScreen( mContext, mConfiguration, mLockPatternUtils, mUpdateMonitor, mKeyguardScreenCallback); } else { throw new IllegalArgumentException("unknown unlock mode " + unlockMode); } initializeTransportControlView(unlockView); initializeFaceLockAreaView(unlockView); // Only shows view if FaceLock is enabled mUnlockScreenMode = unlockMode; return unlockView; }
2、createLockScreen（）就是创建LockScreen界面：
View createLockScreen() { /*View lockView = new LockScreen( mContext, mConfiguration, mLockPatternUtils, mUpdateMonitor, mKeyguardScreenCallback); initializeTransportControlView(lockView); return lockView;*/ long lockscreenType = 0; try{ lockscreenType = android.provider.Settings.Secure. getLong(mContext.getContentResolver(), "lockscreen.disabled"); }catch(Exception e){ e.printStackTrace(); } View lockView = null; lockView = new LockScreen( mContext, mConfiguration, mLockPatternUtils, mUpdateMonitor, mKeyguardScreenCallback); initializeTransportControlView(lockView); return lockView;}
我们来看看锁屏界面的流程：
step 1：创建LockScreen.java类——>先看看构造函数：
LockScreen(Context context, Configuration configuration, LockPatternUtils lockPatternUtils, KeyguardUpdateMonitor updateMonitor, KeyguardScreenCallback callback) { super(context); mLockPatternUtils = lockPatternUtils; mUpdateMonitor = updateMonitor; mCallback = callback; mEnableMenuKeyInLockScreen = shouldEnableMenuKey(); mCreationOrientation = configuration.orientation; mKeyboardHidden = configuration.hardKeyboardHidden; if (LockPatternKeyguardView.DEBUG_CONFIGURATION) { Log.v(TAG, "***** CREATING LOCK SCREEN", new RuntimeException()); Log.v(TAG, "Cur orient=" + mCreationOrientation + " res orient=" + context.getResources().getConfiguration().orientation); } final LayoutInflater inflater = LayoutInflater.from(context); if (DBG) Log.v(TAG, "Creation orientation = " + mCreationOrientation); if (mCreationOrientation != Configuration.ORIENTATION_LANDSCAPE) { inflater.inflate(R.layout.keyguard_screen_tab_unlock, this, true); } else { inflater.inflate(R.layout.keyguard_screen_tab_unlock_land, this, true); } if (TelephonyManager.getDefault().isMultiSimEnabled()) { mStatusViewManager = new MSimKeyguardStatusViewManager(this, mUpdateMonitor, mLockPatternUtils, mCallback, false); } else { mStatusViewManager = new KeyguardStatusViewManager(this, mUpdateMonitor, mLockPatternUtils, mCallback, false); } setFocusable(true); setFocusableInTouchMode(true); setDescendantFocusability(ViewGroup.FOCUS_BLOCK_DESCENDANTS); mAudioManager = (AudioManager) mContext.getSystemService(Context.AUDIO_SERVICE); // modify by wangxianming in 2012-06-22 if (mAudioManager != null) { mSilentMode = isSilentMode(); } mUnlockWidget = findViewById(R.id.unlock_widget); if (mUnlockWidget instanceof SlidingTab) { SlidingTab slidingTabView = (SlidingTab) mUnlockWidget; slidingTabView.setHoldAfterTrigger(true, false); slidingTabView.setLeftHintText(R.string.lockscreen_unlock_label); slidingTabView.setLeftTabResources( R.drawable.ic_jog_dial_unlock, R.drawable.jog_tab_target_green, R.drawable.jog_tab_bar_left_unlock, R.drawable.jog_tab_left_unlock); SlidingTabMethods slidingTabMethods = new SlidingTabMethods(slidingTabView); slidingTabView.setOnTriggerListener(slidingTabMethods); mUnlockWidgetMethods = slidingTabMethods; } else if (mUnlockWidget instanceof WaveView) { WaveView waveView = (WaveView) mUnlockWidget; WaveViewMethods waveViewMethods = new WaveViewMethods(waveView); waveView.setOnTriggerListener(waveViewMethods); mUnlockWidgetMethods = waveViewMethods; } else if (mUnlockWidget instanceof MultiWaveView) { MultiWaveView multiWaveView = (MultiWaveView) mUnlockWidget; MultiWaveViewMethods multiWaveViewMethods = new MultiWaveViewMethods(multiWaveView); multiWaveView.setOnTriggerListener(multiWaveViewMethods); mUnlockWidgetMethods = multiWaveViewMethods; } else { throw new IllegalStateException("Unrecognized unlock widget: " + mUnlockWidget); } // Update widget with initial ring state mUnlockWidgetMethods.updateResources(); if (DBG) Log.v(TAG, "*** LockScreen accel is " + (mUnlockWidget.isHardwareAccelerated() ? "on":"off")); }
Step 2：在Step 1步骤中根据横竖屏来加载横竖屏的布局：
if (mCreationOrientation != Configuration.ORIENTATION_LANDSCAPE) { inflater.inflate(R.layout.keyguard_screen_tab_unlock, this, true); } else { inflater.inflate(R.layout.keyguard_screen_tab_unlock_land, this, true); }
Step 3：来看看竖屏的布局文件的代码：
<GridLayout xmlns:android="http://schemas.android.com/apk/res/android" android:orientation="vertical" android:layout_width="match_parent" android:layout_height="match_parent" android:gravity="center_horizontal"> <!-- 锁屏界面加载数字时钟 --> <com.android.internal.widget.DigitalClock android:id="@+id/time" android:layout_marginTop="@dimen/keyguard_lockscreen_status_line_clockfont_top_margin" android:layout_marginBottom="12dip" android:layout_marginRight="@dimen/keyguard_lockscreen_status_line_font_right_margin" android:layout_gravity="right"> <!-- Because we can't have multi-tone fonts, we render two TextViews, one on top of the other. Hence the redundant layout... --> <TextView android:id="@+id/timeDisplayBackground" android:layout_width="wrap_content" android:layout_height="wrap_content" android:singleLine="true" android:ellipsize="none" android:textSize="@dimen/keyguard_lockscreen_clock_font_size" android:textAppearance="?android:attr/textAppearanceMedium" android:layout_marginBottom="6dip" android:textColor="@color/lockscreen_clock_background" /> <TextView android:id="@+id/timeDisplayForeground" android:layout_width="wrap_content" android:layout_height="wrap_content" android:singleLine="true" android:ellipsize="none" android:textSize="@dimen/keyguard_lockscreen_clock_font_size" android:textAppearance="?android:attr/textAppearanceMedium" android:layout_marginBottom="6dip" android:textColor="@color/lockscreen_clock_foreground" android:layout_alignLeft="@id/timeDisplayBackground" android:layout_alignTop="@id/timeDisplayBackground" /> </com.android.internal.widget.DigitalClock> <LinearLayout android:orientation="horizontal" android:layout_gravity="right" android:layout_marginRight="@dimen/keyguard_lockscreen_status_line_font_right_margin"> <!-- 锁屏界面加载日期 --> <TextView android:id="@+id/date" android:layout_width="wrap_content" android:layout_height="wrap_content" android:singleLine="true" android:ellipsize="marquee" android:textAppearance="?android:attr/textAppearanceMedium" android:textSize="@dimen/keyguard_lockscreen_status_line_font_size" /> <!-- 锁屏界面加载闹钟状态 --> <TextView android:id="@+id/alarm_status" android:layout_width="wrap_content" android:layout_height="wrap_content" android:layout_marginLeft="16dip" android:singleLine="true" android:ellipsize="marquee" android:textAppearance="?android:attr/textAppearanceMedium" android:textSize="@dimen/keyguard_lockscreen_status_line_font_size" android:drawablePadding="4dip" /> </LinearLayout> <!-- 锁屏界面加载充电状态 --> <TextView android:id="@+id/status1" android:layout_gravity="right" android:layout_marginRight="@dimen/keyguard_lockscreen_status_line_font_right_margin" android:singleLine="true" android:ellipsize="marquee" android:textAppearance="?android:attr/textAppearanceMedium" android:textSize="@dimen/keyguard_lockscreen_status_line_font_size" android:drawablePadding="4dip" /> <Space android:layout_gravity="fill" /> <RelativeLayout android:layout_width="match_parent" android:layout_height="302dip"> <!-- 锁屏界面加载波纹的锁屏 --> <com.android.internal.widget.multiwaveview.MultiWaveView android:id="@+id/unlock_widget" android:orientation="horizontal" android:layout_width="match_parent" android:layout_height="match_parent" android:layout_alignParentBottom="true" android:targetDrawables="@array/lockscreen_targets_with_camera" android:targetDescriptions="@array/lockscreen_target_descriptions_with_camera" android:directionDescriptions="@array/lockscreen_direction_descriptions" android:handleDrawable="@drawable/ic_lockscreen_handle" android:waveDrawable="@drawable/ic_lockscreen_outerring" android:outerRadius="@dimen/multiwaveview_target_placement_radius" android:snapMargin="@dimen/multiwaveview_snap_margin" android:hitRadius="@dimen/multiwaveview_hit_radius" android:rightChevronDrawable="@drawable/ic_lockscreen_chevron_right" android:horizontalOffset="0dip" android:verticalOffset="60dip" android:feedbackCount="3" android:vibrationDuration="20" /> <!-- 锁屏界面加载运营商状态 --> <TextView android:id="@+id/carrier" android:layout_width="fill_parent" android:layout_height="wrap_content" android:layout_alignParentBottom="true" android:layout_marginBottom="12dip" android:gravity="center_horizontal" android:singleLine="true" android:ellipsize="marquee" android:textAppearance="?android:attr/textAppearanceMedium" android:textSize="@dimen/keyguard_lockscreen_status_line_font_size" android:textColor="?android:attr/textColorSecondary" /> </RelativeLayout> <LinearLayout android:orientation="horizontal" android:layout_width="match_parent" style="?android:attr/buttonBarStyle" android:gravity="center" android:weightSum="2"> <!-- 锁屏界面加载紧急拨号按钮 --> <Button android:id="@+id/emergencyCallButton" android:layout_gravity="center_horizontal" android:layout_width="0dip" android:layout_height="wrap_content" android:layout_weight="1" style="?android:attr/buttonBarButtonStyle" android:textSize="@dimen/keyguard_lockscreen_status_line_font_size" android:text="@*android:string/lockscreen_emergency_call" android:drawableLeft="@*android:drawable/lockscreen_emergency_button" android:drawablePadding="0dip" android:visibility="gone" /> </LinearLayout></GridLayout>
Step 4：在Step 3中重点看com.android.internal.widget.multiwaveview.MultiWaveView这个自定义的view，这个view是处理ICS4.0锁屏的拖拽的功能，具体代码如下：
public MultiWaveView(Context context, AttributeSet attrs) { super(context, attrs); Resources res = context.getResources();。。。 。。。加载资源。。。 。。。}
通过onMeasure（）来计算自定义view的大小：
protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) { final int minimumWidth = getSuggestedMinimumWidth(); final int minimumHeight = getSuggestedMinimumHeight(); int viewWidth = resolveMeasured(widthMeasureSpec, minimumWidth); int viewHeight = resolveMeasured(heightMeasureSpec, minimumHeight); setMeasuredDimension(viewWidth, viewHeight); }
通过onLayout（）来加载布局：
protected void onLayout(boolean changed, int left, int top, int right, int bottom) { super.onLayout(changed, left, top, right, bottom); final int width = right - left; final int height = bottom - top; float newWaveCenterX = mHorizontalOffset + Math.max(width, mOuterRing.getWidth() ) / 2; float newWaveCenterY = mVerticalOffset + Math.max(height, mOuterRing.getHeight()) / 2; if (newWaveCenterX != mWaveCenterX || newWaveCenterY != mWaveCenterY) { if (mWaveCenterX == 0 && mWaveCenterY == 0) { performInitialLayout(newWaveCenterX, newWaveCenterY); } mWaveCenterX = newWaveCenterX; mWaveCenterY = newWaveCenterY; mOuterRing.setX(mWaveCenterX); mOuterRing.setY(Math.max(mWaveCenterY, mWaveCenterY)); updateTargetPositions(); } if (DEBUG) dump(); }
Step 5：来看看触摸屏幕时的事件处理onTouchEvent（）代码如下：
@Override public boolean onTouchEvent(MotionEvent event) { final int action = event.getAction(); boolean handled = false; switch (action) { case MotionEvent.ACTION_DOWN: handleDown(event); handled = true; break; case MotionEvent.ACTION_MOVE: handleMove(event); handled = true; break; case MotionEvent.ACTION_UP: handleMove(event); handleUp(event); handled = true; break; case MotionEvent.ACTION_CANCEL: handleMove(event); handled = true; break; } invalidate(); return handled ? true : super.onTouchEvent(event); }
通过handleMove（）来处理移动事件：
private void handleMove(MotionEvent event) { if (!mDragging) { trySwitchToFirstTouchState(event); return; } int activeTarget = -1; final int historySize = event.getHistorySize(); for (int k = 0; k < historySize + 1; k++) { float x = k < historySize ? event.getHistoricalX(k) : event.getX(); float y = k < historySize ? event.getHistoricalY(k) : event.getY(); float tx = x - mWaveCenterX; float ty = y - mWaveCenterY; float touchRadius = (float) Math.sqrt(dist2(tx, ty)); final float scale = touchRadius > mOuterRadius ? mOuterRadius / touchRadius : 1.0f; float limitX = mWaveCenterX + tx * scale; float limitY = mWaveCenterY + ty * scale; boolean singleTarget = mTargetDrawables.size() == 1; if (singleTarget) { // Snap to outer ring if there's only one target float snapRadius = mOuterRadius - mSnapMargin; if (touchRadius > snapRadius) { activeTarget = 0; x = limitX; y = limitY; } } else { // If there's more than one target, snap to the closest one less than hitRadius away. float best = Float.MAX_VALUE; final float hitRadius2 = mHitRadius * mHitRadius; for (int i = 0; i < mTargetDrawables.size(); i++) { // Snap to the first target in range TargetDrawable target = mTargetDrawables.get(i); float dx = limitX - target.getX(); float dy = limitY - target.getY(); float dist2 = dx*dx + dy*dy; if (target.isValid() && dist2 < hitRadius2 && dist2 < best) { activeTarget = i; best = dist2; } } x = limitX; y = limitY; } if (activeTarget != -1) { switchToState(STATE_SNAP, x,y); float newX = singleTarget ? limitX : mTargetDrawables.get(activeTarget).getX(); float newY = singleTarget ? limitY : mTargetDrawables.get(activeTarget).getY(); moveHandleTo(newX, newY, false); TargetDrawable currentTarget = mTargetDrawables.get(activeTarget); if (currentTarget.hasState(TargetDrawable.STATE_FOCUSED)) { currentTarget.setState(TargetDrawable.STATE_FOCUSED); mHandleDrawable.setAlpha(0.0f); } } else { switchToState(STATE_TRACKING, x, y); moveHandleTo(x, y, false); mHandleDrawable.setAlpha(1.0f); } } // Draw handle outside parent's bounds invalidateGlobalRegion(mHandleDrawable); if (mActiveTarget != activeTarget && activeTarget != -1) { dispatchGrabbedEvent(activeTarget); if (AccessibilityManager.getInstance(mContext).isEnabled()) { String targetContentDescription = getTargetDescription(activeTarget); announceText(targetContentDescription); } } mActiveTarget = activeTarget; }以上主要工作是绘制拖拽的参数以及绘制出来。通过invalidate（）来主动刷屏幕；
在onDraw（）方法中实现绘制图形，代码如下：
@Override protected void onDraw(Canvas canvas) { mOuterRing.draw(canvas); for (TargetDrawable target : mTargetDrawables) { if (target != null) { target.draw(canvas); } } for (TargetDrawable target : mChevronDrawables) { if (target != null) { target.draw(canvas); } } mHandleDrawable.draw(canvas); }
在handleMove（）方法中——>trySwitchToFirstTouchState(event);——>switchToState()——>doFinish();
——>setGrabbedState() ————> mOnTriggerListener.onGrabbedStateChange(this, mGrabbedState);
设置回调。
Step 6： LockScreen.java中有个内部类，监听这个移动事件的状态，——> 代码如下：
class MultiWaveViewMethods implements MultiWaveView.OnTriggerListener, UnlockWidgetCommonMethods { private final MultiWaveView mMultiWaveView; private boolean mCameraDisabled; MultiWaveViewMethods(MultiWaveView multiWaveView) { mMultiWaveView = multiWaveView; final boolean cameraDisabled = mLockPatternUtils.getDevicePolicyManager() .getCameraDisabled(null); if (cameraDisabled) { Log.v(TAG, "Camera disabled by Device Policy"); mCameraDisabled = true; } else { // Camera is enabled if resource is initially defined for MultiWaveView // in the lockscreen layout file mCameraDisabled = mMultiWaveView.getTargetResourceId() != R.array.lockscreen_targets_with_camera; } } public void updateResources() { int resId; if (mCameraDisabled) { // Fall back to showing ring/silence if camera is disabled by DPM... resId = mSilentMode ? R.array.lockscreen_targets_when_silent : R.array.lockscreen_targets_when_soundon; } else { resId = R.array.lockscreen_targets_with_camera; } mMultiWaveView.setTargetResources(resId); } public void onGrabbed(View v, int handle) { } public void onReleased(View v, int handle) { } public void onTrigger(View v, int target) { if (target == 0 || target == 1) { // 0 = unlock/portrait, 1 = unlock/landscape mCallback.goToUnlockScreen(); } else if (target == 2 || target == 3) { // 2 = alt/portrait, 3 = alt/landscape if (!mCameraDisabled) { // Start the Camera Intent intent = new Intent(MediaStore.INTENT_ACTION_STILL_IMAGE_CAMERA); intent.setFlags(Intent.FLAG_ACTIVITY_NEW_TASK); mContext.startActivity(intent); mCallback.goToUnlockScreen(); } else { toggleRingMode(); mUnlockWidgetMethods.updateResources(); mCallback.pokeWakelock(); } } } public void onGrabbedStateChange(View v, int handle) { // Don't poke the wake lock when returning to a state where the handle is // not grabbed since that can happen when the system (instead of the user) // cancels the grab. if (handle != MultiWaveView.OnTriggerListener.NO_HANDLE) { mCallback.pokeWakelock(); } } public View getView() { return mMultiWaveView; } public void reset(boolean animate) { mMultiWaveView.reset(animate); } public void ping() { mMultiWaveView.ping(); } }
重点看public void onTrigger（）这个方法，用于处理拖拽启动那个activity，一个启动camera，一个正常解锁。
锁屏的大概这个流程就是这个样子了，大家应该会一目了然了。由于时间仓促，难免有点纰漏，希望大家指正错误，如有不解的地方，欢迎留言探讨！！！