AndroidICS4.0锁屏流程

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；

                     

         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：

[java]  view plain copy print ?

1. View createUnlockScreenFor(UnlockMode unlockMode) {  
2.        View unlockView = null;  
3.   
4.        if (DEBUG) Log.d(TAG,  
5.                "createUnlockScreenFor(" + unlockMode + "): mEnableFallback=" + mEnableFallback);  
6.   
7.        if (unlockMode == UnlockMode.Pattern) {  
8.            PatternUnlockScreen view = new PatternUnlockScreen(  
9.                    mContext,  
10.                    mConfiguration,  
11.                    mLockPatternUtils,  
12.                    mUpdateMonitor,  
13.                    mKeyguardScreenCallback,  
14.                    mUpdateMonitor.getFailedAttempts());  
15.            view.setEnableFallback(mEnableFallback);  
16.            unlockView = view;  
17.        } else if (unlockMode == UnlockMode.SimPuk) {  
18.            unlockView = new SimPukUnlockScreen(  
19.                    mContext,  
20.                    mConfiguration,  
21.                    mUpdateMonitor,  
22.                    mKeyguardScreenCallback,  
23.                    mLockPatternUtils, MSimTelephonyManager.getDefault().getDefaultSubscription());  
24.        } else if (unlockMode == UnlockMode.SimPin) {  
25.            unlockView = new SimUnlockScreen(  
26.                    mContext,  
27.                    mConfiguration,  
28.                    mUpdateMonitor,  
29.                    mKeyguardScreenCallback,  
30.                    mLockPatternUtils);  
31.        } else if (unlockMode == UnlockMode.Account) {  
32.            try {  
33.                unlockView = new AccountUnlockScreen(  
34.                        mContext,  
35.                        mConfiguration,  
36.                        mUpdateMonitor,  
37.                        mKeyguardScreenCallback,  
38.                        mLockPatternUtils);  
39.            } catch (IllegalStateException e) {  
40.                Log.i(TAG, "Couldn't instantiate AccountUnlockScreen"  
41.                      + " (IAccountsService isn't available)");  
42.                // TODO: Need a more general way to provide a  
43.                // platform-specific fallback UI here.  
44.                // For now, if we can't display the account login  
45.                // unlock UI, just bring back the regular "Pattern" unlock mode.  
46.   
47.                // (We do this by simply returning a regular UnlockScreen  
48.                // here.  This means that the user will still see the  
49.                // regular pattern unlock UI, regardless of the value of  
50.                // mUnlockScreenMode or whether or not we're in the  
51.                // "permanently locked" state.)  
52.                return createUnlockScreenFor(UnlockMode.Pattern);  
53.            }  
54.        } else if (unlockMode == UnlockMode.Password) {  
55.            unlockView = new PasswordUnlockScreen(  
56.                    mContext,  
57.                    mConfiguration,  
58.                    mLockPatternUtils,  
59.                    mUpdateMonitor,  
60.                    mKeyguardScreenCallback);  
61.        } else {  
62.            throw new IllegalArgumentException("unknown unlock mode " + unlockMode);  
63.        }  
64.        initializeTransportControlView(unlockView);  
65.        initializeFaceLockAreaView(unlockView); // Only shows view if FaceLock is enabled  
66.   
67.        mUnlockScreenMode = unlockMode;  
68.        return unlockView;  
69.    }  

 

2、createLockScreen（）就是创建LockScreen界面：

[java]  view plain copy print ?

1. View createLockScreen() {  
2.         /*View lockView = new LockScreen( 
3.                 mContext, 
4.                 mConfiguration, 
5.                 mLockPatternUtils, 
6.                 mUpdateMonitor, 
7.                 mKeyguardScreenCallback); 
8.          initializeTransportControlView(lockView); 
9.          return lockView;*/  
10.           
11.         long lockscreenType = 0;  
12.         try{  
13.             lockscreenType = android.provider.Settings.Secure.  
14.                     getLong(mContext.getContentResolver(), "lockscreen.disabled");  
15.         }catch(Exception e){  
16.             e.printStackTrace();  
17.         }  
18.         View lockView = null;  
19.          lockView = new LockScreen(  
20.                     mContext,  
21.                     mConfiguration,  
22.                     mLockPatternUtils,  
23.                     mUpdateMonitor,  
24.                     mKeyguardScreenCallback);     
25.          initializeTransportControlView(lockView);  
26.         return lockView;  
27. }  

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：

[java]  view plain copy print ?

1. LockScreen(Context context, Configuration configuration, LockPatternUtils lockPatternUtils,  
2.            KeyguardUpdateMonitor updateMonitor,  
3.            KeyguardScreenCallback callback) {  
4.        super(context);  
5.        mLockPatternUtils = lockPatternUtils;  
6.        mUpdateMonitor = updateMonitor;  
7.        mCallback = callback;  
8.   
9.        mEnableMenuKeyInLockScreen = shouldEnableMenuKey();  
10.   
11.        mCreationOrientation = configuration.orientation;  
12.   
13.        mKeyboardHidden = configuration.hardKeyboardHidden;  
14.   
15.        if (LockPatternKeyguardView.DEBUG_CONFIGURATION) {  
16.            Log.v(TAG, "***** CREATING LOCK SCREEN", new RuntimeException());  
17.            Log.v(TAG, "Cur orient=" + mCreationOrientation  
18.                    + " res orient=" + context.getResources().getConfiguration().orientation);  
19.        }  
20.   
21.        final LayoutInflater inflater = LayoutInflater.from(context);  
22.        if (DBG) Log.v(TAG, "Creation orientation = " + mCreationOrientation);  
23.        if (mCreationOrientation != Configuration.ORIENTATION_LANDSCAPE) {  
24.            inflater.inflate(R.layout.keyguard_screen_tab_unlock, this, true);  
25.        } else {  
26.            inflater.inflate(R.layout.keyguard_screen_tab_unlock_land, this, true);  
27.        }  
28.   
29.        if (TelephonyManager.getDefault().isMultiSimEnabled()) {  
30.            mStatusViewManager = new MSimKeyguardStatusViewManager(this, mUpdateMonitor,  
31.                    mLockPatternUtils, mCallback, false);  
32.        } else {  
33.            mStatusViewManager = new KeyguardStatusViewManager(this, mUpdateMonitor,  
34.                    mLockPatternUtils, mCallback, false);  
35.        }  
36.   
37.        setFocusable(true);  
38.        setFocusableInTouchMode(true);  
39.        setDescendantFocusability(ViewGroup.FOCUS_BLOCK_DESCENDANTS);  
40.   
41.        mAudioManager = (AudioManager) mContext.getSystemService(Context.AUDIO_SERVICE);  
42.        // modify by wangxianming in 2012-06-22  
43.        if (mAudioManager != null) {  
44.         mSilentMode = isSilentMode();  
45.        }  
46.   
47.        mUnlockWidget = findViewById(R.id.unlock_widget);  
48.        if (mUnlockWidget instanceof SlidingTab) {  
49.            SlidingTab slidingTabView = (SlidingTab) mUnlockWidget;  
50.            slidingTabView.setHoldAfterTrigger(true, false);  
51.            slidingTabView.setLeftHintText(R.string.lockscreen_unlock_label);  
52.            slidingTabView.setLeftTabResources(  
53.                    R.drawable.ic_jog_dial_unlock,  
54.                    R.drawable.jog_tab_target_green,  
55.                    R.drawable.jog_tab_bar_left_unlock,  
56.                    R.drawable.jog_tab_left_unlock);  
57.            SlidingTabMethods slidingTabMethods = new SlidingTabMethods(slidingTabView);  
58.            slidingTabView.setOnTriggerListener(slidingTabMethods);  
59.            mUnlockWidgetMethods = slidingTabMethods;  
60.        } else if (mUnlockWidget instanceof WaveView) {  
61.            WaveView waveView = (WaveView) mUnlockWidget;  
62.            WaveViewMethods waveViewMethods = new WaveViewMethods(waveView);  
63.            waveView.setOnTriggerListener(waveViewMethods);  
64.            mUnlockWidgetMethods = waveViewMethods;  
65.        } else if (mUnlockWidget instanceof MultiWaveView) {  
66.            MultiWaveView multiWaveView = (MultiWaveView) mUnlockWidget;  
67.            MultiWaveViewMethods multiWaveViewMethods = new MultiWaveViewMethods(multiWaveView);  
68.            multiWaveView.setOnTriggerListener(multiWaveViewMethods);  
69.            mUnlockWidgetMethods = multiWaveViewMethods;  
70.        } else {  
71.            throw new IllegalStateException("Unrecognized unlock widget: " + mUnlockWidget);  
72.        }  
73.   
74.        // Update widget with initial ring state  
75.        mUnlockWidgetMethods.updateResources();  
76.   
77.        if (DBG) Log.v(TAG, "*** LockScreen accel is "  
78.                + (mUnlockWidget.isHardwareAccelerated() ? "on":"off"));  
79.    }  

 

Step 2：在Step 1步骤中根据横竖屏来加载横竖屏的布局：

[java]  view plain copy print ?

1. if (mCreationOrientation != Configuration.ORIENTATION_LANDSCAPE) {  
2.             inflater.inflate(R.layout.keyguard_screen_tab_unlock, this, true);  
3.         } else {  
4.             inflater.inflate(R.layout.keyguard_screen_tab_unlock_land, this, true);  
5.         }  

 

Step 3：来看看竖屏的布局文件的代码：

[java]  view plain copy print ?

1. <GridLayout  
2.     xmlns:android="http://schemas.android.com/apk/res/android"  
3.     android:orientation="vertical"  
4.     android:layout_width="match_parent"  
5.     android:layout_height="match_parent"  
6.     android:gravity="center_horizontal">  
7.     <!-- 锁屏界面加载数字时钟 -->  
8.     <com.android.internal.widget.DigitalClock android:id="@+id/time"  
9.         android:layout_marginTop="@dimen/keyguard_lockscreen_status_line_clockfont_top_margin"  
10.         android:layout_marginBottom="12dip"  
11.         android:layout_marginRight="@dimen/keyguard_lockscreen_status_line_font_right_margin"  
12.         android:layout_gravity="right">  
13.   
14.         <!-- Because we can't have multi-tone fonts, we render two TextViews, one on  
15.         top of the other. Hence the redundant layout... -->  
16.         <TextView android:id="@+id/timeDisplayBackground"  
17.             android:layout_width="wrap_content"  
18.             android:layout_height="wrap_content"  
19.             android:singleLine="true"  
20.             android:ellipsize="none"  
21.             android:textSize="@dimen/keyguard_lockscreen_clock_font_size"  
22.             android:textAppearance="?android:attr/textAppearanceMedium"  
23.             android:layout_marginBottom="6dip"  
24.             android:textColor="@color/lockscreen_clock_background"  
25.             />  
26.   
27.         <TextView android:id="@+id/timeDisplayForeground"  
28.             android:layout_width="wrap_content"  
29.             android:layout_height="wrap_content"  
30.             android:singleLine="true"  
31.             android:ellipsize="none"  
32.             android:textSize="@dimen/keyguard_lockscreen_clock_font_size"  
33.             android:textAppearance="?android:attr/textAppearanceMedium"  
34.             android:layout_marginBottom="6dip"  
35.             android:textColor="@color/lockscreen_clock_foreground"  
36.             android:layout_alignLeft="@id/timeDisplayBackground"  
37.             android:layout_alignTop="@id/timeDisplayBackground"  
38.             />  
39.   
40.     </com.android.internal.widget.DigitalClock>  
41.   
42.     <LinearLayout  
43.         android:orientation="horizontal"  
44.         android:layout_gravity="right"  
45.         android:layout_marginRight="@dimen/keyguard_lockscreen_status_line_font_right_margin">  
46.         <!-- 锁屏界面加载日期 -->  
47.         <TextView  
48.             android:id="@+id/date"  
49.             android:layout_width="wrap_content"  
50.             android:layout_height="wrap_content"  
51.             android:singleLine="true"  
52.             android:ellipsize="marquee"  
53.             android:textAppearance="?android:attr/textAppearanceMedium"  
54.             android:textSize="@dimen/keyguard_lockscreen_status_line_font_size"  
55.             />  
56.         <!-- 锁屏界面加载闹钟状态 -->  
57.         <TextView  
58.             android:id="@+id/alarm_status"  
59.             android:layout_width="wrap_content"  
60.             android:layout_height="wrap_content"  
61.             android:layout_marginLeft="16dip"  
62.             android:singleLine="true"  
63.             android:ellipsize="marquee"  
64.             android:textAppearance="?android:attr/textAppearanceMedium"  
65.             android:textSize="@dimen/keyguard_lockscreen_status_line_font_size"  
66.             android:drawablePadding="4dip"  
67.             />  
68.   
69.     </LinearLayout>  
70.     <!-- 锁屏界面加载充电状态 -->  
71.     <TextView  
72.         android:id="@+id/status1"  
73.         android:layout_gravity="right"  
74.         android:layout_marginRight="@dimen/keyguard_lockscreen_status_line_font_right_margin"  
75.         android:singleLine="true"  
76.         android:ellipsize="marquee"  
77.         android:textAppearance="?android:attr/textAppearanceMedium"  
78.         android:textSize="@dimen/keyguard_lockscreen_status_line_font_size"  
79.         android:drawablePadding="4dip"  
80.         />  
81.   
82.     <Space android:layout_gravity="fill" />  
83.         <RelativeLayout  
84.         android:layout_width="match_parent"  
85.         android:layout_height="302dip">  
86.         <!-- 锁屏界面加载波纹的锁屏 -->  
87.         <com.android.internal.widget.multiwaveview.MultiWaveView  
88.             android:id="@+id/unlock_widget"  
89.             android:orientation="horizontal"  
90.             android:layout_width="match_parent"  
91.             android:layout_height="match_parent"  
92.             android:layout_alignParentBottom="true"  
93.   
94.             android:targetDrawables="@array/lockscreen_targets_with_camera"  
95.             android:targetDescriptions="@array/lockscreen_target_descriptions_with_camera"  
96.             android:directionDescriptions="@array/lockscreen_direction_descriptions"  
97.             android:handleDrawable="@drawable/ic_lockscreen_handle"  
98.             android:waveDrawable="@drawable/ic_lockscreen_outerring"  
99.             android:outerRadius="@dimen/multiwaveview_target_placement_radius"  
100.             android:snapMargin="@dimen/multiwaveview_snap_margin"  
101.             android:hitRadius="@dimen/multiwaveview_hit_radius"  
102.             android:rightChevronDrawable="@drawable/ic_lockscreen_chevron_right"  
103.             android:horizontalOffset="0dip"  
104.             android:verticalOffset="60dip"  
105.             android:feedbackCount="3"  
106.             android:vibrationDuration="20"  
107.             />  
108.         <!-- 锁屏界面加载运营商状态 -->  
109.         <TextView  
110.             android:id="@+id/carrier"  
111.             android:layout_width="fill_parent"  
112.             android:layout_height="wrap_content"  
113.             android:layout_alignParentBottom="true"  
114.             android:layout_marginBottom="12dip"  
115.             android:gravity="center_horizontal"  
116.             android:singleLine="true"  
117.             android:ellipsize="marquee"  
118.             android:textAppearance="?android:attr/textAppearanceMedium"  
119.             android:textSize="@dimen/keyguard_lockscreen_status_line_font_size"  
120.             android:textColor="?android:attr/textColorSecondary"  
121.             />  
122.   
123.     </RelativeLayout>  
124.   
125.     <LinearLayout  
126.         android:orientation="horizontal"  
127.         android:layout_width="match_parent"  
128.         style="?android:attr/buttonBarStyle"  
129.         android:gravity="center"  
130.         android:weightSum="2">  
131.         <!-- 锁屏界面加载紧急拨号按钮 -->  
132.         <Button android:id="@+id/emergencyCallButton"  
133.             android:layout_gravity="center_horizontal"  
134.             android:layout_width="0dip"  
135.             android:layout_height="wrap_content"  
136.             android:layout_weight="1"  
137.             style="?android:attr/buttonBarButtonStyle"  
138.             android:textSize="@dimen/keyguard_lockscreen_status_line_font_size"  
139.             android:text="@*android:string/lockscreen_emergency_call"  
140.             android:drawableLeft="@*android:drawable/lockscreen_emergency_button"  
141.             android:drawablePadding="0dip"  
142.             android:visibility="gone"  
143.         />  
144.   
145.     </LinearLayout>  
146.   
147. </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：

[java]  view plain copy print ?

1.  public MultiWaveView(Context context, AttributeSet attrs) {  
2.         super(context, attrs);  
3.         Resources res = context.getResources();  
4. 。。。 。。。  
5. 加载资源  
6. 。。。 。。。  
7. }  

 

通过onMeasure（）来计算自定义view的大小：

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1. protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) {  
2.        final int minimumWidth = getSuggestedMinimumWidth();  
3.        final int minimumHeight = getSuggestedMinimumHeight();  
4.        int viewWidth = resolveMeasured(widthMeasureSpec, minimumWidth);  
5.        int viewHeight = resolveMeasured(heightMeasureSpec, minimumHeight);  
6.        setMeasuredDimension(viewWidth, viewHeight);  
7.    }  

 

通过onLayout（）来加载布局：

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1. protected void onLayout(boolean changed, int left, int top, int right, int bottom) {  
2.        super.onLayout(changed, left, top, right, bottom);  
3.        final int width = right - left;  
4.        final int height = bottom - top;  
5.        float newWaveCenterX = mHorizontalOffset + Math.max(width, mOuterRing.getWidth() ) / 2;  
6.        float newWaveCenterY = mVerticalOffset + Math.max(height, mOuterRing.getHeight()) / 2;  
7.        if (newWaveCenterX != mWaveCenterX || newWaveCenterY != mWaveCenterY) {  
8.            if (mWaveCenterX == 0 && mWaveCenterY == 0) {  
9.                performInitialLayout(newWaveCenterX, newWaveCenterY);  
10.            }  
11.            mWaveCenterX = newWaveCenterX;  
12.            mWaveCenterY = newWaveCenterY;  
13.   
14.            mOuterRing.setX(mWaveCenterX);  
15.            mOuterRing.setY(Math.max(mWaveCenterY, mWaveCenterY));  
16.   
17.            updateTargetPositions();  
18.        }  
19.        if (DEBUG) dump();  
20.    }  

Step 5：来看看触摸屏幕时的事件处理onTouchEvent（）代码如下：

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1. @Override  
2.    public boolean onTouchEvent(MotionEvent event) {  
3.        final int action = event.getAction();  
4.   
5.        boolean handled = false;  
6.        switch (action) {  
7.            case MotionEvent.ACTION_DOWN:  
8.                handleDown(event);  
9.                handled = true;  
10.                break;  
11.   
12.            case MotionEvent.ACTION_MOVE:  
13.                handleMove(event);  
14.                handled = true;  
15.                break;  
16.   
17.            case MotionEvent.ACTION_UP:  
18.                handleMove(event);  
19.                handleUp(event);  
20.                handled = true;  
21.                break;  
22.   
23.            case MotionEvent.ACTION_CANCEL:  
24.                handleMove(event);  
25.                handled = true;  
26.                break;  
27.        }  
28.        invalidate();  
29.        return handled ? true : super.onTouchEvent(event);  
30.    }  

通过handleMove（）来处理移动事件：

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1. private void handleMove(MotionEvent event) {  
2.        if (!mDragging) {  
3.            trySwitchToFirstTouchState(event);  
4.            return;  
5.        }  
6.   
7.        int activeTarget = -1;  
8.        final int historySize = event.getHistorySize();  
9.        for (int k = 0; k < historySize + 1; k++) {  
10.            float x = k < historySize ? event.getHistoricalX(k) : event.getX();  
11.            float y = k < historySize ? event.getHistoricalY(k) : event.getY();  
12.            float tx = x - mWaveCenterX;  
13.            float ty = y - mWaveCenterY;  
14.            float touchRadius = (float) Math.sqrt(dist2(tx, ty));  
15.            final float scale = touchRadius > mOuterRadius ? mOuterRadius / touchRadius : 1.0f;  
16.            float limitX = mWaveCenterX + tx * scale;  
17.            float limitY = mWaveCenterY + ty * scale;  
18.   
19.            boolean singleTarget = mTargetDrawables.size() == 1;  
20.            if (singleTarget) {  
21.                // Snap to outer ring if there's only one target  
22.                float snapRadius = mOuterRadius - mSnapMargin;  
23.                if (touchRadius > snapRadius) {  
24.                    activeTarget = 0;  
25.                    x = limitX;  
26.                    y = limitY;  
27.                }  
28.            } else {  
29.                // If there's more than one target, snap to the closest one less than hitRadius away.  
30.                float best = Float.MAX_VALUE;  
31.                final float hitRadius2 = mHitRadius * mHitRadius;  
32.                for (int i = 0; i < mTargetDrawables.size(); i++) {  
33.                    // Snap to the first target in range  
34.                    TargetDrawable target = mTargetDrawables.get(i);  
35.                    float dx = limitX - target.getX();  
36.                    float dy = limitY - target.getY();  
37.                    float dist2 = dx*dx + dy*dy;  
38.                    if (target.isValid() && dist2 < hitRadius2 && dist2 < best) {  
39.                        activeTarget = i;  
40.                        best = dist2;  
41.                    }  
42.                }  
43.                x = limitX;  
44.                y = limitY;  
45.            }  
46.            if (activeTarget != -1) {  
47.                switchToState(STATE_SNAP, x,y);  
48.                float newX = singleTarget ? limitX : mTargetDrawables.get(activeTarget).getX();  
49.                float newY = singleTarget ? limitY : mTargetDrawables.get(activeTarget).getY();  
50.                moveHandleTo(newX, newY, false);  
51.                TargetDrawable currentTarget = mTargetDrawables.get(activeTarget);  
52.                if (currentTarget.hasState(TargetDrawable.STATE_FOCUSED)) {  
53.                    currentTarget.setState(TargetDrawable.STATE_FOCUSED);  
54.                    mHandleDrawable.setAlpha(0.0f);  
55.                }  
56.            } else {  
57.                switchToState(STATE_TRACKING, x, y);  
58.                moveHandleTo(x, y, false);  
59.                mHandleDrawable.setAlpha(1.0f);  
60.            }  
61.        }  
62.   
63.        // Draw handle outside parent's bounds  
64.        invalidateGlobalRegion(mHandleDrawable);  
65.   
66.        if (mActiveTarget != activeTarget && activeTarget != -1) {  
67.            dispatchGrabbedEvent(activeTarget);  
68.            if (AccessibilityManager.getInstance(mContext).isEnabled()) {  
69.                String targetContentDescription = getTargetDescription(activeTarget);  
70.                announceText(targetContentDescription);  
71.            }  
72.        }  
73.        mActiveTarget = activeTarget;  
74.    }  

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：

[java]  view plain copy print ?

1. @Override  
2. protected void onDraw(Canvas canvas) {  
3.     mOuterRing.draw(canvas);  
4.     for (TargetDrawable target : mTargetDrawables) {  
5.         if (target != null) {  
6.             target.draw(canvas);  
7.         }  
8.     }  
9.     for (TargetDrawable target : mChevronDrawables) {  
10.         if (target != null) {  
11.             target.draw(canvas);  
12.         }  
13.     }  
14.     mHandleDrawable.draw(canvas);  
15. }  

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：

[java]  view plain copy print ?

1. class MultiWaveViewMethods implements MultiWaveView.OnTriggerListener,  
2.            UnlockWidgetCommonMethods {  
3.   
4.        private final MultiWaveView mMultiWaveView;  
5.        private boolean mCameraDisabled;  
6.   
7.        MultiWaveViewMethods(MultiWaveView multiWaveView) {  
8.            mMultiWaveView = multiWaveView;  
9.            final boolean cameraDisabled = mLockPatternUtils.getDevicePolicyManager()  
10.                    .getCameraDisabled(null);  
11.            if (cameraDisabled) {  
12.                Log.v(TAG, "Camera disabled by Device Policy");  
13.                mCameraDisabled = true;  
14.            } else {  
15.                // Camera is enabled if resource is initially defined for MultiWaveView  
16.                // in the lockscreen layout file  
17.                mCameraDisabled = mMultiWaveView.getTargetResourceId()  
18.                        != R.array.lockscreen_targets_with_camera;  
19.            }  
20.        }  
21.   
22.        public void updateResources() {  
23.            int resId;  
24.            if (mCameraDisabled) {  
25.                // Fall back to showing ring/silence if camera is disabled by DPM...  
26.                resId = mSilentMode ? R.array.lockscreen_targets_when_silent  
27.                    : R.array.lockscreen_targets_when_soundon;  
28.            } else {  
29.                resId = R.array.lockscreen_targets_with_camera;  
30.            }  
31.            mMultiWaveView.setTargetResources(resId);  
32.        }  
33.   
34.        public void onGrabbed(View v, int handle) {  
35.   
36.        }  
37.   
38.        public void onReleased(View v, int handle) {  
39.   
40.        }  
41.   
42.        public void onTrigger(View v, int target) {  
43.            if (target == 0 || target == 1) { // 0 = unlock/portrait, 1 = unlock/landscape  
44.                mCallback.goToUnlockScreen();  
45.            } else if (target == 2 || target == 3) { // 2 = alt/portrait, 3 = alt/landscape  
46.                if (!mCameraDisabled) {  
47.                    // Start the Camera  
48.                    Intent intent = new Intent(MediaStore.INTENT_ACTION_STILL_IMAGE_CAMERA);  
49.                    intent.setFlags(Intent.FLAG_ACTIVITY_NEW_TASK);  
50.                    mContext.startActivity(intent);  
51.                    mCallback.goToUnlockScreen();  
52.                } else {  
53.                    toggleRingMode();  
54.                    mUnlockWidgetMethods.updateResources();  
55.                    mCallback.pokeWakelock();  
56.                }  
57.            }  
58.        }  
59.   
60.        public void onGrabbedStateChange(View v, int handle) {  
61.            // Don't poke the wake lock when returning to a state where the handle is  
62.            // not grabbed since that can happen when the system (instead of the user)  
63.            // cancels the grab.  
64.            if (handle != MultiWaveView.OnTriggerListener.NO_HANDLE) {  
65.                mCallback.pokeWakelock();  
66.            }  
67.        }  
68.   
69.        public View getView() {  
70.            return mMultiWaveView;  
71.        }  
72.   
73.        public void reset(boolean animate) {  
74.            mMultiWaveView.reset(animate);  
75.        }  
76.   
77.        public void ping() {  
78.            mMultiWaveView.ping();  
79.        }  
80.    }  

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！！！

来源：oschina

链接：https://my.oschina.net/u/250247/blog/68663