安卓各种抢红包插件原理--AccessibilityService

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public class MyAccessibilityService extends AccessibilityService {

    private static final String TAG = "MyAccessibilityService";

    @Override
    public void onCreate() {
        super.onCreate();
        Log.i(TAG, "onCreate");
    }

    @Override
    public void onAccessibilityEvent(AccessibilityEvent event) {
        int eventType = event.getEventType();
        switch (eventType) {
            case AccessibilityEvent.TYPE_VIEW_CLICKED:
                // 捕获到点击事件
                Log.i(TAG, "capture click event!");
                AccessibilityNodeInfo nodeInfo = getRootInActiveWindow();
                if (nodeInfo != null) {
                    // 查找text为Test!的控件
                    List<AccessibilityNodeInfo> button = nodeInfo.findAccessibilityNodeInfosByText("Test!");
                    nodeInfo.recycle();
                    for (AccessibilityNodeInfo item : button) {
                        Log.i(TAG, "long-click button!");
                        // 执行长按操作
                        item.performAction(AccessibilityNodeInfo.ACTION_LONG_CLICK);
                    }
                }
                break;
            default:
                break;
        }
    }

    @Override
    public void onInterrupt() {
        Log.i(TAG, "onInterrupt");
    }
}

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<?xml version="1.0" encoding="utf-8"?>
<accessibility-service xmlns:android="http://schemas.android.com/apk/res/android"
    android:accessibilityEventTypes="typeAllMask"
    android:accessibilityFeedbackType="feedbackSpoken"
    android:accessibilityFlags="flagRetrieveInteractiveWindows|flagRequestFilterKeyEvents"
    android:canRequestFilterKeyEvents="true"
    android:canRetrieveWindowContent="true"
    android:description="@string/app_name"
    android:notificationTimeout="100"
    android:packageNames="com.xu.accessibilitydemo" />

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<service
    android:name=".MyAccessibilityService"
    android:enabled="true"
    android:exported="true"
    android:permission="android.permission.BIND_ACCESSIBILITY_SERVICE">
    <intent-filter>
        <action android:name="android.accessibilityservice.AccessibilityService"/>
    </intent-filter>

     <meta-data
         android:name="android.accessibilityservice"
         android:resource="@xml/accessibility_service_config"/>
</service>

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public class MainActivity extends AppCompatActivity {

    private static final String TAG = "MainActivity";

    private Button button;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);

        button = findViewById(R.id.button);

        button.setOnLongClickListener(new View.OnLongClickListener() {
            @Override
            public boolean onLongClick(View v) {
                Log.i(TAG, "onLongClick");
                return false;
            }
        });

    }
}

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public abstract class AccessibilityService extends Service {
      // 省略代码
      public abstract void onAccessibilityEvent(AccessibilityEvent event);
      
      public abstract void onInterrupt();

      @Override
      public final IBinder onBind(Intent intent) {
          return new IAccessibilityServiceClientWrapper(this, getMainLooper(), new Callbacks() {
              @Override
              public void onServiceConnected() {
                  AccessibilityService.this.dispatchServiceConnected();
              }

              @Override
              public void onInterrupt() {
                  AccessibilityService.this.onInterrupt();
              }

              @Override
              public void onAccessibilityEvent(AccessibilityEvent event) {
                  AccessibilityService.this.onAccessibilityEvent(event);
              }

              @Override
              public void init(int connectionId, IBinder windowToken) {
                  mConnectionId = connectionId;
                  mWindowToken = windowToken;

                  // The client may have already obtained the window manager, so
                  // update the default token on whatever manager we gave them.
                  final WindowManagerImpl wm = (WindowManagerImpl) getSystemService(WINDOW_SERVICE);
                  wm.setDefaultToken(windowToken);
              }

              @Override
              public boolean onGesture(int gestureId) {
                  return AccessibilityService.this.onGesture(gestureId);
              }

              @Override
              public boolean onKeyEvent(KeyEvent event) {
                  return AccessibilityService.this.onKeyEvent(event);
              }

              @Override
              public void onMagnificationChanged(@NonNull Region region,
                      float scale, float centerX, float centerY) {
                  AccessibilityService.this.onMagnificationChanged(region, scale, centerX, centerY);
              }

              @Override
              public void onSoftKeyboardShowModeChanged(int showMode) {
                  AccessibilityService.this.onSoftKeyboardShowModeChanged(showMode);
              }

              @Override
              public void onPerformGestureResult(int sequence, boolean completedSuccessfully) {
                  AccessibilityService.this.onPerformGestureResult(sequence, completedSuccessfully);
              }
          });
      }
}

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// 以分析onAccessibilityEvent为例，省略部分代码
public static class IAccessibilityServiceClientWrapper extends IAccessibilityServiceClient.Stub
            implements HandlerCaller.Callback {
    private final HandlerCaller mCaller;
    private final Callbacks mCallback;
    private int mConnectionId;
    
    public IAccessibilityServiceClientWrapper(Context context, Looper looper,
                Callbacks callback) {
        mCallback = callback;
        mCaller = new HandlerCaller(context, looper, this, true /*asyncHandler*/);
    }
    
    public void init(IAccessibilityServiceConnection connection, int connectionId,
                IBinder windowToken) {
        Message message = mCaller.obtainMessageIOO(DO_INIT, connectionId,
                    connection, windowToken);
        mCaller.sendMessage(message);
    }
    
    // 省略部分代码 

    public void onAccessibilityEvent(AccessibilityEvent event) {
        Message message = mCaller.obtainMessageO(DO_ON_ACCESSIBILITY_EVENT, event);
        mCaller.sendMessage(message);
    }

    @Override
    public void executeMessage(Message message) {
        switch (message.what) {
            case DO_ON_ACCESSIBILITY_EVENT: {
                AccessibilityEvent event = (AccessibilityEvent) message.obj;
                if (event != null) {
                    AccessibilityInteractionClient.getInstance().onAccessibilityEvent(event);
                    mCallback.onAccessibilityEvent(event);
                    // Make sure the event is recycled.
                    try {
                        event.recycle();
                    } catch (IllegalStateException ise) {
                        /* ignore - best effort */
                    }
                }
            } return;
            // ...         
        }
     }
}

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public boolean performClick() {
    final boolean result;
    final ListenerInfo li = mListenerInfo;
    if (li != null && li.mOnClickListener != null) {
        playSoundEffect(SoundEffectConstants.CLICK);
        li.mOnClickListener.onClick(this);
        result = true;
    } else {
        result = false;
    }
    // ！！！
    sendAccessibilityEvent(AccessibilityEvent.TYPE_VIEW_CLICKED);
    return result;
}

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public void sendAccessibilityEventUncheckedInternal(AccessibilityEvent event) {
    if (!isShown()) {
        return;
    }
    onInitializeAccessibilityEvent(event);
    // Only a subset of accessibility events populates text content.
    if ((event.getEventType() & POPULATING_ACCESSIBILITY_EVENT_TYPES) != 0) {
        dispatchPopulateAccessibilityEvent(event);
    }
    // In the beginning we called #isShown(), so we know that getParent() is not null.
    getParent().requestSendAccessibilityEvent(this, event);
}

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@Override
public boolean requestSendAccessibilityEvent(View child, AccessibilityEvent event) {
    ViewParent parent = mParent;
    if (parent == null) {
        return false;
    }
    final boolean propagate = onRequestSendAccessibilityEvent(child, event);
    if (!propagate) {
        return false;
    }
    return parent.requestSendAccessibilityEvent(this, event);
}

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void assignParent(ViewParent parent) {
    if (mParent == null) {
        mParent = parent;
    } else if (parent == null) {
        mParent = null;
    } else {
        throw new RuntimeException("view " + this + " being added, but" + " it already has a parent");
    }
}

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@Override
public boolean requestSendAccessibilityEvent(View child, AccessibilityEvent event) {
    if (mView == null || mStopped || mPausedForTransition) {
        return false;
    }
    // Intercept accessibility focus events fired by virtual nodes to keep
    // track of accessibility focus position in such nodes.
    final int eventType = event.getEventType();
    switch (eventType) {
        case AccessibilityEvent.TYPE_VIEW_ACCESSIBILITY_FOCUSED:
            {
                final long sourceNodeId = event.getSourceNodeId();
                final int accessibilityViewId = AccessibilityNodeInfo.getAccessibilityViewId(sourceNodeId);
                View source = mView.findViewByAccessibilityId(accessibilityViewId);
                if (source != null) {
                    AccessibilityNodeProvider provider = source.getAccessibilityNodeProvider();
                    if (provider != null) {
                        final int virtualNodeId = AccessibilityNodeInfo.getVirtualDescendantId(sourceNodeId);
                        final AccessibilityNodeInfo node;
                        if (virtualNodeId == AccessibilityNodeInfo.UNDEFINED_ITEM_ID) {
                            node = provider.createAccessibilityNodeInfo(AccessibilityNodeProvider.HOST_VIEW_ID);
                        } else {
                            node = provider.createAccessibilityNodeInfo(virtualNodeId);
                        }
                        setAccessibilityFocus(source, node);
                    }
                }
            }
            break;
            // 省略部分代码
    }
    // ！！！
    mAccessibilityManager.sendAccessibilityEvent(event);
    return true;
}

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public void sendAccessibilityEvent(AccessibilityEvent event) {
    final IAccessibilityManager service;
    final int userId;
    synchronized(mLock) {
        service = getServiceLocked();
        if (service == null) {
            return;
        }
        if (!mIsEnabled) {
            Looper myLooper = Looper.myLooper();
            if (myLooper == Looper.getMainLooper()) {
                throw new IllegalStateException("Accessibility off. Did you forget to check that?");
            } else {
                // If we're not running on the thread with the main looper, it's possible for
                // the state of accessibility to change between checking isEnabled and
                // calling this method. So just log the error rather than throwing the
                // exception.
                Log.e(LOG_TAG, "AccessibilityEvent sent with accessibility disabled");
                return;
            }
        }
        userId = mUserId;
    }
    boolean doRecycle = false;
    try {
        event.setEventTime(SystemClock.uptimeMillis());
        // it is possible that this manager is in the same process as the service but
        // client using it is called through Binder from another process. Example: MMS
        // app adds a SMS notification and the NotificationManagerService calls this method
        long identityToken = Binder.clearCallingIdentity();
        // ！！！
        doRecycle = service.sendAccessibilityEvent(event, userId);
        Binder.restoreCallingIdentity(identityToken);
        if (DEBUG) {
            Log.i(LOG_TAG, event + " sent");
        }
    } catch (RemoteException re) {
        Log.e(LOG_TAG, "Error during sending " + event + " ", re);
    } finally {
        if (doRecycle) {
            event.recycle();
        }
    }
}

private IAccessibilityManager getServiceLocked() {
    if (mService == null) {
        tryConnectToServiceLocked(null);
    }
    return mService;
}

private void tryConnectToServiceLocked(IAccessibilityManager service) {
    if (service == null) {
        IBinder iBinder = ServiceManager.getService(Context.ACCESSIBILITY_SERVICE);
        if (iBinder == null) {
            return;
        }
        service = IAccessibilityManager.Stub.asInterface(iBinder);
    }
    try {
        final int stateFlags = service.addClient(mClient, mUserId);
        setStateLocked(stateFlags);
        mService = service;
    } catch (RemoteException re) {
        Log.e(LOG_TAG, "AccessibilityManagerService is dead", re);
    }
}

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@Override
public boolean sendAccessibilityEvent(AccessibilityEvent event, int userId) {
    synchronized(mLock) {
        // We treat calls from a profile as if made by its parent as profiles
        // share the accessibility state of the parent. The call below
        // performs the current profile parent resolution..
        final int resolvedUserId = mSecurityPolicy.resolveCallingUserIdEnforcingPermissionsLocked(userId);
        // This method does nothing for a background user.
        if (resolvedUserId != mCurrentUserId) {
            return true; // yes, recycle the event
        }
        if (mSecurityPolicy.canDispatchAccessibilityEventLocked(event)) {
            mSecurityPolicy.updateActiveAndAccessibilityFocusedWindowLocked(event.getWindowId(), event.getSourceNodeId(), event.getEventType(), event.getAction());
            mSecurityPolicy.updateEventSourceLocked(event);
            // ！！！
            notifyAccessibilityServicesDelayedLocked(event, false);
            notifyAccessibilityServicesDelayedLocked(event, true);
        }
        if (mHasInputFilter && mInputFilter != null) {
            mMainHandler.obtainMessage(MainHandler.MSG_SEND_ACCESSIBILITY_EVENT_TO_INPUT_FILTER, AccessibilityEvent.obtain(event)).sendToTarget();
        }
        event.recycle();
    }
    return (OWN_PROCESS_ID != Binder.getCallingPid());
}

private void notifyAccessibilityServicesDelayedLocked(AccessibilityEvent event, boolean isDefault) {
    try {
        UserState state = getCurrentUserStateLocked();
        for (int i = 0, count = state.mBoundServices.size(); i < count; i++) {
            Service service = state.mBoundServices.get(i);
            if (service.mIsDefault == isDefault) {
                if (canDispatchEventToServiceLocked(service, event)) {
                    service.notifyAccessibilityEvent(event);
                }
            }
        }
    } catch (IndexOutOfBoundsException oobe) {
        // An out of bounds exception can happen if services are going away
        // as the for loop is running. If that happens, just bail because
        // there are no more services to notify.
    }
}

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public List<AccessibilityNodeInfo> findAccessibilityNodeInfosByText(int connectionId, int accessibilityWindowId, long accessibilityNodeId, String text) {
    try {
        IAccessibilityServiceConnection connection = getConnection(connectionId);
        if (connection != null) {
            final int interactionId = mInteractionIdCounter.getAndIncrement();
            final long identityToken = Binder.clearCallingIdentity();
            final boolean success = connection.findAccessibilityNodeInfosByText(accessibilityWindowId, accessibilityNodeId, text, interactionId, this, Thread.currentThread().getId());
            Binder.restoreCallingIdentity(identityToken);
            if (success) {
                List<AccessibilityNodeInfo> infos = getFindAccessibilityNodeInfosResultAndClear(interactionId);
                if (infos != null) {
                    finalizeAndCacheAccessibilityNodeInfos(infos, connectionId);
                    return infos;
                }
            }
        } else {
            if (DEBUG) {
                Log.w(LOG_TAG, "No connection for connection id: " + connectionId);
            }
        }
    } catch (RemoteException re) {
        Log.w(LOG_TAG, "Error while calling remote" + " findAccessibilityNodeInfosByViewText", re);
    }
    return Collections.emptyList();
}

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@Override
public boolean findAccessibilityNodeInfosByText(int accessibilityWindowId, long accessibilityNodeId, String text, int interactionId, IAccessibilityInteractionConnectionCallback callback, long interrogatingTid) throws RemoteException {
    final int resolvedWindowId;
    IAccessibilityInteractionConnection connection = null;
    Region partialInteractiveRegion = Region.obtain();
    synchronized(mLock) {
        if (!isCalledForCurrentUserLocked()) {
            return false;
        }
        resolvedWindowId = resolveAccessibilityWindowIdLocked(accessibilityWindowId);
        final boolean permissionGranted = mSecurityPolicy.canGetAccessibilityNodeInfoLocked(this, resolvedWindowId);
        if (!permissionGranted) {
            return false;
        } else {
            connection = getConnectionLocked(resolvedWindowId);
            if (connection == null) {
                return false;
            }
        }
        if (!mSecurityPolicy.computePartialInteractiveRegionForWindowLocked(resolvedWindowId, partialInteractiveRegion)) {
            partialInteractiveRegion.recycle();
            partialInteractiveRegion = null;
        }
    }
    final int interrogatingPid = Binder.getCallingPid();
    final long identityToken = Binder.clearCallingIdentity();
    MagnificationSpec spec = getCompatibleMagnificationSpecLocked(resolvedWindowId);
    try {
        connection.findAccessibilityNodeInfosByText(accessibilityNodeId, text, partialInteractiveRegion, interactionId, callback, mFetchFlags, interrogatingPid, interrogatingTid, spec);
        return true;
    } catch (RemoteException re) {
        if (DEBUG) {
            Slog.e(LOG_TAG, "Error calling findAccessibilityNodeInfosByText()");
        }
    } finally {
        Binder.restoreCallingIdentity(identityToken);
        // Recycle if passed to another process.
        if (partialInteractiveRegion != null && Binder.isProxy(connection)) {
            partialInteractiveRegion.recycle();
        }
    }
    return false;
}