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Implement global double finger long press to return to the desktop
2022-06-28 08:45:00 【When it rains at night in Bashan】
Recently made a function , Because our equipment , No function keys , So you need to implement a function , No matter which application on the device , Long press with both fingers , You have to go back Launcher Interface .
Just started to meet this demand , A face of meng , I went to , this … It was all in a App Jump around in the , That's all right. , How to make it , Can't write , Then copy it , A quick search on the Internet , Little information was found , Suddenly thought of , Global gesture returns to the desktop , Go to the Android native global gesture code
Add gestures
///WorkSpaces/LA.UM.9.15/LINUX/android/frameworks/base/services/core/java/com/android/server/wm/SystemGesturesPointerEventListener.java
// Global gesture core code
@Override
public void onPointerEvent(MotionEvent event) {
if (mGestureDetector != null && event.isTouchEvent()) {
mGestureDetector.onTouchEvent(event);
}
switch (event.getActionMasked()) {
case MotionEvent.ACTION_DOWN:
mSwipeFireable = true;
mDebugFireable = true;
mDownPointers = 0;
captureDown(event, 0);
if (mMouseHoveringAtEdge) {
mMouseHoveringAtEdge = false;
mCallbacks.onMouseLeaveFromEdge();
}
mCallbacks.onDown();
break;
case MotionEvent.ACTION_POINTER_DOWN:
captureDown(event, event.getActionIndex());
if (mDebugFireable) {
mDebugFireable = event.getPointerCount() < 5;
if (!mDebugFireable) {
if (DEBUG) Slog.d(TAG, "Firing debug");
mCallbacks.onDebug();
}
}
break;
case MotionEvent.ACTION_MOVE:
if (mSwipeFireable) {
final int swipe = detectSwipe(event);
mSwipeFireable = swipe == SWIPE_NONE;
if (swipe == SWIPE_FROM_TOP) {
if (DEBUG) Slog.d(TAG, "Firing onSwipeFromTop");
mCallbacks.onSwipeFromTop();
} else if (swipe == SWIPE_FROM_BOTTOM) {
if (DEBUG) Slog.d(TAG, "Firing onSwipeFromBottom");
mCallbacks.onSwipeFromBottom();
} else if (swipe == SWIPE_FROM_RIGHT) {
if (DEBUG) Slog.d(TAG, "Firing onSwipeFromRight");
mCallbacks.onSwipeFromRight();
} else if (swipe == SWIPE_FROM_LEFT) {
if (DEBUG) Slog.d(TAG, "Firing onSwipeFromLeft");
mCallbacks.onSwipeFromLeft();
}
}
break;
case MotionEvent.ACTION_HOVER_MOVE:
if (event.isFromSource(InputDevice.SOURCE_MOUSE)) {
if (!mMouseHoveringAtEdge && event.getY() == 0) {
mCallbacks.onMouseHoverAtTop();
mMouseHoveringAtEdge = true;
} else if (!mMouseHoveringAtEdge && event.getY() >= screenHeight - 1) {
mCallbacks.onMouseHoverAtBottom();
mMouseHoveringAtEdge = true;
} else if (mMouseHoveringAtEdge
&& (event.getY() > 0 && event.getY() < screenHeight - 1)) {
mCallbacks.onMouseLeaveFromEdge();
mMouseHoveringAtEdge = false;
}
}
break;
case MotionEvent.ACTION_UP:
case MotionEvent.ACTION_CANCEL:
mSwipeFireable = false;
mDebugFireable = false;
mCallbacks.onUpOrCancel();
break;
default:
if (DEBUG) Slog.d(TAG, "Ignoring " + event);
}
}
ad locum , We see four callbacks , These are the four common global gestures
interface Callbacks {
void onSwipeFromTop();
void onSwipeFromBottom();
void onSwipeFromRight();
void onSwipeFromLeft();
}
Then we can see their implementation here
//frameworks/base/services/core/java/com/android/server/wm/DisplayPolicy.java
DisplayPolicy(WindowManagerService service, DisplayContent displayContent) {
//.................
mSystemGestures = new SystemGesturesPointerEventListener(mContext, mHandler,
new SystemGesturesPointerEventListener.Callbacks() {
@Override
public void onSwipeFromTop() {
synchronized (mLock) {
if (mStatusBar != null) {
requestTransientBars(mStatusBar);
}
}
}
@Override
public void onSwipeFromBottom() {
synchronized (mLock) {
if (mNavigationBar != null
&& mNavigationBarPosition == NAV_BAR_BOTTOM) {
requestTransientBars(mNavigationBar);
}
}
}
@Override
public void onSwipeFromRight() {
final Region excludedRegion = Region.obtain();
synchronized (mLock) {
mDisplayContent.calculateSystemGestureExclusion(
excludedRegion, null /* outUnrestricted */);
final boolean sideAllowed = mNavigationBarAlwaysShowOnSideGesture
|| mNavigationBarPosition == NAV_BAR_RIGHT;
if (mNavigationBar != null && sideAllowed
&& !mSystemGestures.currentGestureStartedInRegion(
excludedRegion)) {
requestTransientBars(mNavigationBar);
}
}
excludedRegion.recycle();
}
@Override
public void onSwipeFromLeft() {
final Region excludedRegion = Region.obtain();
synchronized (mLock) {
mDisplayContent.calculateSystemGestureExclusion(
excludedRegion, null /* outUnrestricted */);
final boolean sideAllowed = mNavigationBarAlwaysShowOnSideGesture
|| mNavigationBarPosition == NAV_BAR_LEFT;
if (mNavigationBar != null && sideAllowed
&& !mSystemGestures.currentGestureStartedInRegion(
excludedRegion)) {
requestTransientBars(mNavigationBar);
}
}
excludedRegion.recycle();
}
@Override
public void onFling(int duration) {
if (mService.mPowerManagerInternal != null) {
mService.mPowerManagerInternal.powerHint(
PowerHint.INTERACTION, duration);
}
}
});
//...................
}
Here is the specific implementation of them , So if our requirement is to go up and return to the desktop , Then just in onSwipeFromBottom Just do the return operation . But what we need is a long press with two fingers …
incorrect , We seem to have seen something just now , Look back
///WorkSpaces/LA.UM.9.15/LINUX/android/frameworks/base/services/core/java/com/android/server/wm/SystemGesturesPointerEventListener.java
@Override
public void onPointerEvent(MotionEvent event) {
if (mGestureDetector != null && event.isTouchEvent()) {
mGestureDetector.onTouchEvent(event);
}
//.......................
}
// Keep looking down
public void systemReady() {
// GestureDetector records statistics about gesture classification events to inform gesture
// usage trends. SystemGesturesPointerEventListener creates a lot of noise in these
// statistics because it passes every touch event though a GestureDetector. By creating an
// anonymous subclass of GestureDetector, these statistics will be recorded with a unique
// source name that can be filtered.
// GestureDetector would get a ViewConfiguration instance by context, that may also
// create a new WindowManagerImpl for the new display, and lock WindowManagerGlobal
// temporarily in the constructor that would make a deadlock.
mHandler.post(() -> {
final int displayId = mContext.getDisplayId();
final DisplayInfo info = DisplayManagerGlobal.getInstance().getDisplayInfo(displayId);
if (info == null) {
// Display already removed, stop here.
Slog.w(TAG, "Cannot create GestureDetector, display removed:" + displayId);
return;
}
mGestureDetector = new GestureDetector(mContext, new FlingGestureDetector(), mHandler) {
};
});
}
private final class FlingGestureDetector extends GestureDetector.SimpleOnGestureListener {
private OverScroller mOverscroller;
FlingGestureDetector() {
mOverscroller = new OverScroller(mContext);
}
@Override
public boolean onSingleTapUp(MotionEvent e) {
if (!mOverscroller.isFinished()) {
mOverscroller.forceFinished(true);
}
return true;
}
@Override
public boolean onFling(MotionEvent down, MotionEvent up,
float velocityX, float velocityY) {
//............
return true;
}
}
///frameworks/base/core/java/android/view/GestureDetector.java
public static class SimpleOnGestureListener implements OnGestureListener, OnDoubleTapListener,
OnContextClickListener {
public boolean onSingleTapUp(MotionEvent e) {
return false;
}
public void onLongPress(MotionEvent e) {
}
public boolean onScroll(MotionEvent e1, MotionEvent e2,
float distanceX, float distanceY) {
return false;
}
public boolean onFling(MotionEvent e1, MotionEvent e2, float velocityX,
float velocityY) {
return false;
}
public void onShowPress(MotionEvent e) {
}
public boolean onDown(MotionEvent e) {
return false;
}
public boolean onDoubleTap(MotionEvent e) {
return false;
}
public boolean onDoubleTapEvent(MotionEvent e) {
return false;
}
public boolean onSingleTapConfirmed(MotionEvent e) {
return false;
}
public boolean onContextClick(MotionEvent e) {
return false;
}
}
You can see some methods that have been implemented at the bottom, such as stand-alone , Double click and so on for us to use .
brainwave , Then we are GestureDetector To realize the logic of long pressing with two fingers , And then on top FlingGestureDetector Long press with two fingers in the call , In it, you can implement the logic of returning to the desktop , No OK 了 .
to SimpleOnGestureListener Add a two finger long press event , And then in GestureDetector Of onTouchEvent In the method , Do double finger long press event trigger logic , About the following
private void handlePointerDown(MotionEvent ev, Float focusX) {
Log.d(TAG, "handlePointerDown");
mDoubleFingerPressStartMs = SystemClock.elapsedRealtime();
if (ev.getPointerCount() != 2 || !isDoubleFingerEvent()) {
return;
}
mDownFocusX = focusX;
if (mCurrentPointerDownEvent != null) {
mCurrentPointerDownEvent.recycle();
}
mCurrentPointerDownEvent = MotionEvent.obtain(ev);
mHandler.removeMessages(DOUBLE_FINGER_PRESS);
mHandler.sendEmptyMessageAtTime(DOUBLE_FINGER_PRESS, SystemClock.uptimeMillis() + 1000);
}
private boolean isDoubleFingerEvent() {
return mDoubleFingerPressStartMs - mSingleFingerPressStartMs <= 100;
}
private void handlePointerUp(MotionEvent ev) {
Log.d(TAG, "handlePointerUp");
if (ev.getPointerCount() != 2 || !isDoubleFingerEvent()) {
return;
}
mHandler.removeMessages(DOUBLE_FINGER_PRESS);
}
And in the SystemGesturesPointerEventListener Class FlingGestureDetector Here is the added double finger long pressing method ：
@Override
public boolean onDoubleFingerLongPress(MotionEvent e) {
if (DEBUG) Slog.d(TAG, "onDoubleFingerLongPress");
return true;
}
Compile the package , After brushing in , Long press with both fingers , I found that the log was successfully typed , Next , We need to think about how to get back to the table
Back to the desktop
This is much easier , We home key , perhaps back Key can be returned , however back Key words , If the application enters the secondary page , Then you have to perform two long double finger presses , Does not meet the requirements . So we must consider home event .
Reference resources
private void sendKey(int keyCode) {
try {
int inputSource = KeyEvent.FLAG_FROM_SYSTEM | KeyEvent.FLAG_VIRTUAL_HARD_KEY | InputDevice.SOURCE_KEYBOARD;
long now = SystemClock.uptimeMillis();
boolean istrue = InputManager.getInstance().injectInputEvent(
new KeyEvent(
now, now, KeyEvent.ACTION_DOWN, keyCode, 0, 0,
KeyCharacterMap.VIRTUAL_KEYBOARD, 0, 0, inputSource
), InputManager.INJECT_INPUT_EVENT_MODE_WAIT_FOR_FINISH
);
boolean isok = InputManager.getInstance().injectInputEvent(
new KeyEvent(
now, now, KeyEvent.ACTION_UP, keyCode, 0, 0,
KeyCharacterMap.VIRTUAL_KEYBOARD, 0, 0, inputSource
), InputManager.INJECT_INPUT_EVENT_MODE_WAIT_FOR_FINISH
);
} catch (Exception e) {
e.printStackTrace();
}
}
// So we can return to the desktop just by calling .
@Override
public boolean onDoubleFingerLongPress(MotionEvent e) {
if (DEBUG) Slog.d(TAG, "onDoubleFingerLongPress");
sendKey(KeyEvent.KEYCODE_HOME);
return true;
}
summary : Framework Code , Or see , Look at what good people write
After reading it , Paint a tiger like a cat , Don't worry , Take your time .
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