連続スワイプアップ/スワイプダウンイベントで数値をインクリメント/デクリメントしたい。GestureDetector と OnSwipeTouchListener を使用して、簡単なスワイプ イベントを実装できます。
ただし、このスワイプ イベントは、スワイプ後に指が離されたときにのみ感知されます。したがって、数値を +5 に増やすには、画面上で 5 回個別にスワイプする必要があります。
ユーザーが画面上の任意の場所を上下にスワイプしているときに数字が変更されるような「スライダー」のようなアクションを適用したい。(「スライダー」ウィジェットは使いたくない)。
これは可能ですか？
どんな助けでも本当に感謝しています。ありがとう！
@1up、解決策をありがとう！
追加できる拡張機能は、指を離さずにスワイプの方向を逆にしても、うまく機能することです。
あなたが与えたスケルトンを使用して、将来誰かに役立つことを期待して私のコードを投稿してください...
public class OnSwipeListener implements OnTouchListener
{
@Override
public boolean onTouch(View v, MotionEvent event)
{
boolean result = false;
float currentX = 0.0f;
float currentY = 0.0f;
float current_diffX = 0.0f;
float current_diffY = 0.0f;
switch(event.getAction())
{
case MotionEvent.ACTION_DOWN:
//Touch detected, record base X-Y coordinates
baseX = event.getX();
baseY = event.getY();
//As the event is consumed, return true
result = true;
break;
case MotionEvent.ACTION_MOVE:
//Swipe started, get current X-Y coordinates and compute those with the base ones
currentX = event.getX();
currentY = event.getY();
current_diffX = currentX - baseX;
current_diffY = currentY - baseY;
//...................................................Determine horizontal swipe direction
if(h_swipe == LEFT_SWIPE)
{
if( currentX > previousX )
{
//If here, then horizontal swipe has been reversed
h_swipe = RIGHT_SWIPE;
//Overwrite base coordinate
baseX = previousX;
//Recalculate Difference
current_diffX = currentX - baseX;
}
else
{
//NOP - Intentionally kept empty
}
}
else if(h_swipe == RIGHT_SWIPE)
{
if( currentX < previousX )
{
//If here, then horizontal swipe has been reversed
h_swipe = LEFT_SWIPE;
//Overwrite base coordinate
baseX = previousX;
//Recalculate Difference
current_diffX = currentX - baseX;
}
else
{
//NOP - Intentionally kept empty
}
}
else
{
//If here, then it's a fresh swipe event, so compare with base coordinates
if( currentX < baseX )
{
h_swipe = LEFT_SWIPE;
}
else if( currentX > baseX )
{
h_swipe = RIGHT_SWIPE;
}
else
{
//NOP - Intentionally kept empty
}
}
//...................................................Determine vertical swipe direction
if(v_swipe == UP_SWIPE)
{
if(currentY > previousY)
{
//If here, then vertical swipe has been reversed
v_swipe = DOWN_SWIPE;
//Overwrite base coordinate
baseY = previousY;
//Recalculate coordinate difference
current_diffY = currentY - baseY;
}
else
{
//NOP - Intentionally kept empty
}
}
else if(v_swipe == DOWN_SWIPE)
{
if(currentY < previousY)
{
//If here, then vertical swipe has been reversed
v_swipe = UP_SWIPE;
//Overwrite base coordinate
baseY = previousY;
//Recalculate coordinate difference
current_diffY = currentY - baseY;
}
else
{
//NOP - Intentionally kept empty
}
}
else
{
//If here, then it's a fresh swipe event, so compare with base coordinates
if( currentY < baseY )
{
v_swipe = UP_SWIPE;
}
else if( currentY > baseY )
{
v_swipe = DOWN_SWIPE;
}
else
{
//NOP - Intentionally kept empty
}
}
//Record current coordinates for future comparisons
previousX = currentX;
previousY = currentY;
//................................Determine the prominent swipe (horizontal/vertical)
if(Math.abs(current_diffX) > Math.abs(current_diffY))
{
//It's a horizontal swipe
if (Math.abs(current_diffX) > SWIPE_THRESHOLD)
{
if (current_diffX > 0)
{
onRightSwipe();
}
else
{
onLeftSwipe();
}
}
else
{
//Not enough swipe movement, ignore.
//NOP - Intentionally kept empty
}
}
else
{
//It's a vertical swipe
if (Math.abs(current_diffY) > SWIPE_THRESHOLD)
{
if (current_diffY > 0)
{
onDownSwipe();
}
else
{
onUpSwipe();
}
}
else
{
//Not enough swipe movement, ignore.
//NOP - Intentionally kept empty
}
}
//As the event is consumed, return true
result = true;
break;
case MotionEvent.ACTION_UP:
//Swipe ended, clear variables, if necessary
h_swipe = NO_H_SWIPE;
v_swipe = NO_V_SWIPE;
baseX = 0.0f;
baseY = 0.0f;
previousX = 0.0f;
previousY = 0.0f;
//As the event is consumed, return true
result = true;
break;
default:
//Do not consume event
result = false;
break;
}
return result;
}
public void onUpSwipe()
{
}
public void onDownSwipe()
{
}
public void onRightSwipe()
{
}
public void onLeftSwipe()
{
}
}
そこで、独自のバージョンの方向リスナーを作成しました。
注 : 連続タッチ セッションでのスワイプの方向が表示されます。
import android.view.MotionEvent;
import android.view.View;
public class SwipeDirectionListener implements View.OnTouchListener {
float deltaX ;
float deltaY ;
float maxValX;
float maxValY;
float firstTouchX;
float firstTouchY;
float currentX ;
float currentY ;
float SWIPE_THRESHOLD = 10.0f;
@Override
public boolean onTouch(View v, MotionEvent event) {
boolean result ;
switch (event.getAction()) {
case MotionEvent.ACTION_DOWN:
//Register the first touch on TouchDown and this should not change unless finger goes up.
firstTouchX = event.getX();
firstTouchY = event.getY();
maxValX = 0.0f;
maxValY = 0.0f;
//As the event is consumed, return true
result = true;
break;
case MotionEvent.ACTION_MOVE:
//CurrentX/Y are the continues changing values of one single touch session. Change
//when finger slides on view
currentX = event.getX();
currentY = event.getY();
//setting the maximum value of X or Y so far. Any deviation in this means a change of direction so reset the firstTouch value to last known max value i.e MaxVal X/Y.
if(maxValX <currentX){
maxValX = currentX;
}else{
firstTouchX= maxValX;
maxValX =0.0f;
}
if(maxValY <currentY){
maxValY = currentY;
}else{
firstTouchY= maxValY;
maxValY =0.0f;
}
//DeltaX/Y are the difference between current touch and the value when finger first touched screen.
//If its negative that means current value is on left side of first touchdown value i.e Going left and
//vice versa.
deltaX = currentX - firstTouchX;
deltaY = currentY - firstTouchY;
if (Math.abs(deltaX) > Math.abs(deltaY)) {
//Horizontal swipe
if (Math.abs(deltaX) > SWIPE_THRESHOLD) {
if (deltaX > 0) {
//means we are going right
onRightSwipe(currentX);
} else {
//means we are going left
onLeftSwipe(currentX);
}
}
} else {
//It's a vertical swipe
if (Math.abs(deltaY) > SWIPE_THRESHOLD) {
if (deltaY > 0) {
//means we are going down
onDownSwipe(currentY);
} else {
//means we are going up
onUpSwipe(currentY);
}
}
}
result = true;
break;
case MotionEvent.ACTION_UP:
//Clean UP
firstTouchX = 0.0f;
firstTouchY = 0.0f;
result = true;
break;
default:
result = false;
break;
}
return result;
}
public void onUpSwipe(float value) {
}
public void onDownSwipe(float value) {
}
public void onRightSwipe(float value) {
}
public void onLeftSwipe(float value) {
}
}
そして、それは魅力のように機能します!
実装：
yourView.setOnTouchListener(new SwipeDirectionListener() {
public void onUpSwipe(float value) {
mTextView.setText("onUpSwipe :"+value);
}
public void onDownSwipe(float value) {
mTextView.setText("onDownSwipe :"+value);
}
public void onRightSwipe(float value) {
mTextView.setText("onRightSwipe :"+value);
}
public void onLeftSwipe(float value) {
mTextView.setText("onLeftSwipe :"+value);
}
});