Android 自定义手势模拟：实现两指缩放手势 (Tasker/All in one Gestures)

"Tasker"和"All in one Gestures"应用利用系统的API和权限来实现自定义手势和模拟多指触摸操作。以下是一个示例代码，演示如何实现两指触摸放大手势：\n\n首先，需要获取系统的权限：\n\njava\n<uses-permission android:name="android.permission.WRITE_SETTINGS" />\n\n\n然后，在代码中使用InputManager和Instrumentation类来模拟多指触摸操作：\n\njava\nimport android.app.Instrumentation;\nimport android.view.InputDevice;\nimport android.view.InputEvent;\nimport android.view.KeyEvent;\nimport android.view.MotionEvent;\nimport android.view.ViewConfiguration;\n\npublic class MultiTouchGestureSimulator {\n private static final int POINTER_DOWN = 5;\n private static final int POINTER_UP = 6;\n\n public static void simulateZoomInGesture() {\n try {\n Instrumentation instrumentation = new Instrumentation();\n long downTime = SystemClock.uptimeMillis();\n long eventTime = SystemClock.uptimeMillis();\n float x = 100.0f; // 触摸点的x坐标\n float y = 100.0f; // 触摸点的y坐标\n float pressure = 1.0f; // 触摸压力\n int pointerId1 = 0;\n int pointerId2 = 1;\n\n // 第一个手指按下事件\n MotionEvent.PointerProperties[] properties = new MotionEvent.PointerProperties[1];\n MotionEvent.PointerCoords[] coords = new MotionEvent.PointerCoords[1];\n MotionEvent.PointerProperties pp1 = new MotionEvent.PointerProperties();\n pp1.id = pointerId1;\n pp1.toolType = MotionEvent.TOOL_TYPE_FINGER;\n properties[0] = pp1;\n MotionEvent.PointerCoords pc1 = new MotionEvent.PointerCoords();\n pc1.x = x;\n pc1.y = y;\n pc1.pressure = pressure;\n pc1.size = 1.0f;\n coords[0] = pc1;\n MotionEvent event = MotionEvent.obtain(downTime, eventTime,\n MotionEvent.ACTION_DOWN, 1, properties, coords,\n 0, 0, 1.0f, 1.0f, 0, 0, InputDevice.SOURCE_TOUCHSCREEN, 0);\n instrumentation.sendPointerSync(event);\n\n // 第二个手指按下事件\n MotionEvent.PointerProperties[] properties2 = new MotionEvent.PointerProperties[2];\n MotionEvent.PointerCoords[] coords2 = new MotionEvent.PointerCoords[2];\n MotionEvent.PointerProperties pp2 = new MotionEvent.PointerProperties();\n pp2.id = pointerId2;\n pp2.toolType = MotionEvent.TOOL_TYPE_FINGER;\n properties2[0] = pp1;\n properties2[1] = pp2;\n MotionEvent.PointerCoords pc2 = new MotionEvent.PointerCoords();\n pc2.x = x + 100.0f; // 第二个触摸点的x坐标\n pc2.y = y + 100.0f; // 第二个触摸点的y坐标\n pc2.pressure = pressure;\n pc2.size = 1.0f;\n coords2[0] = pc1;\n coords2[1] = pc2;\n event = MotionEvent.obtain(downTime, eventTime,\n MotionEvent.ACTION_POINTER_DOWN + (pointerId2 << MotionEvent.ACTION_POINTER_INDEX_SHIFT),\n 2, properties2, coords2,\n 0, 0, 1.0f, 1.0f, 0, 0, InputDevice.SOURCE_TOUCHSCREEN, 0);\n instrumentation.sendPointerSync(event);\n\n // 手指移动事件，模拟缩放手势\n int steps = 10; // 缩放步数\n float scaleFactor = 0.9f; // 缩放因子\n for (int i = 0; i < steps; i++) {\n x += (100.0f / steps);\n y += (100.0f / steps);\n pc1.x = x;\n pc1.y = y;\n pc2.x = x + 100.0f;\n pc2.y = y + 100.0f;\n eventTime += ViewConfiguration.getTapTimeout();\n event = MotionEvent.obtain(downTime, eventTime,\n MotionEvent.ACTION_MOVE, 2, properties2, coords2,\n 0, 0, 1.0f, 1.0f, 0, 0, InputDevice.SOURCE_TOUCHSCREEN, 0);\n instrumentation.sendPointerSync(event);\n pc1.x *= scaleFactor;\n pc1.y *= scaleFactor;\n pc2.x *= scaleFactor;\n pc2.y *= scaleFactor;\n }\n\n // 第一个手指抬起事件\n eventTime += ViewConfiguration.getTapTimeout();\n event = MotionEvent.obtain(downTime, eventTime,\n MotionEvent.ACTION_POINTER_UP + (pointerId1 << MotionEvent.ACTION_POINTER_INDEX_SHIFT),\n 1, properties, coords,\n 0, 0, 1.0f, 1.0f, 0, 0, InputDevice.SOURCE_TOUCHSCREEN, 0);\n instrumentation.sendPointerSync(event);\n\n // 第二个手指抬起事件\n eventTime += ViewConfiguration.getTapTimeout();\n event = MotionEvent.obtain(downTime, eventTime,\n MotionEvent.ACTION_UP, 0, properties, coords,\n 0, 0, 1.0f, 1.0f, 0, 0, InputDevice.SOURCE_TOUCHSCREEN, 0);\n instrumentation.sendPointerSync(event);\n } catch (Exception e) {\n e.printStackTrace();\n }\n }\n}\n\n\n你可以在合适的地方调用MultiTouchGestureSimulator.simulateZoomInGesture()来模拟两指触摸放大手势。\n\n请注意，这只是一个简单的示例代码，实际应用中可能需要根据具体需求进行适当的修改和调整。此外，模拟多指触摸操作需要相应的权限，因此在使用时请确保已经获取了相关的权限。