在滑块被拖动时才移动进度条,这是否可能?当前情况是,即便在触摸进度绘制区域时,进度条也会移动。我们如何禁用在触摸进度绘制区域时进度条的移动?
谢谢。
import android.content.Context;
import android.graphics.Rect;
import android.util.AttributeSet;
import android.view.KeyEvent;
import android.view.MotionEvent;
import android.widget.SeekBar;
/**
* A NoSkipSeekBar is an extension of {@link SeekBar} that prevents jumps in position
* by touching outside the current thumb position. Such touches are replaced by
* an increment or decrement the same as would be achieved using a DPAD's Left or
* Right arrow keys.
*/
public class NoSkipSeekBar extends SeekBar {
public NoSkipSeekBar(Context context) {
super(context);
}
public NoSkipSeekBar(Context context, AttributeSet attrs) {
super(context, attrs);
}
public NoSkipSeekBar(Context context, AttributeSet attrs, int defStyle) {
super(context, attrs, defStyle);
}
private boolean isDragging;
private boolean isWithinThumb(MotionEvent event) {
return getThumb().getBounds().contains((int)event.getX(), (int)event.getY());
}
private void increment(int direction) {
if (direction != 0) {
final KeyEvent key = new KeyEvent(KeyEvent.ACTION_DOWN,
direction < 0 ? KeyEvent.KEYCODE_DPAD_LEFT : KeyEvent.KEYCODE_DPAD_RIGHT);
onKeyDown(key.getKeyCode(), key);
}
}
@Override
public boolean onTouchEvent(MotionEvent event) {
if (!isEnabled() || getThumb() == null) return super.onTouchEvent(event);
switch (event.getAction()) {
case MotionEvent.ACTION_DOWN:
if (isWithinThumb(event)) {
isDragging = true;
return super.onTouchEvent(event);
} else {
return true;
}
case MotionEvent.ACTION_UP:
isDragging = false;
if (isWithinThumb(event)) {
return super.onTouchEvent(event);
} else {
final Rect r = getThumb().getBounds();
increment((int)event.getX() - (r.left + r.right) / 2);
return true;
}
case MotionEvent.ACTION_MOVE:
if (!isDragging) return true;
break;
case MotionEvent.ACTION_CANCEL:
isDragging = false;
break;
}
return super.onTouchEvent(event);
}
}
覆盖OnTouchListener
以处理滑动条上的移动事件,仅在MotionEvent
为移动事件时处理拇指的移动。
event.getAction() == MotionEvent.ACTION_MOVE
更新:1
类似下面这样的代码可以工作,但问题是即使用户将拇指移动了2个单位,滑动条也会移动。你真的不应该停止这种行为,因为它会破坏滑动条。
seekBar.setOnTouchListener(new OnTouchListener() {
@Override
public boolean onTouch(View v, MotionEvent event) {
if(event.getAction() == MotionEvent.ACTION_MOVE){
Log.d(TAG, "Moved , process data, Moved to :" + seekBar.getProgress());
seekBar.setProgress(seekBar.getProgress());
return false;
}
Log.d(TAG, "Touched , Progress :" + seekBar.getProgress());
return true;
}
});
import android.content.Context
import android.util.AttributeSet
import android.view.MotionEvent
import androidx.appcompat.widget.AppCompatSeekBar
class NoSkipSeekBar @JvmOverloads constructor(
context: Context,
attrs: AttributeSet? = null,
defStyle: Int = 0
) : AppCompatSeekBar(context, attrs, defStyle) {
private var isDragging = false
private fun isWithinThumb(event: MotionEvent): Boolean {
return thumb.bounds.contains(event.x.toInt(), event.y.toInt())
}
override fun onTouchEvent(event: MotionEvent): Boolean {
if (!isEnabled || thumb == null) return super.onTouchEvent(event)
when (event.action) {
MotionEvent.ACTION_DOWN -> {
if (isWithinThumb(event)) {
isDragging = true
return super.onTouchEvent(event)
} else {
return true
}
}
MotionEvent.ACTION_UP -> {
isDragging = false
return when {
isWithinThumb(event) -> super.onTouchEvent(event)
else -> true
}
}
MotionEvent.ACTION_MOVE -> if (!isDragging) return true
MotionEvent.ACTION_CANCEL -> isDragging = false
}
return super.onTouchEvent(event)
}
}
Ravi的解决方案很好,我进行了一些重构:
两个目的:
getThumb()
函数只能在API 16以上使用的问题。onStopTrackingTouch()
,而只是拖动滑块。这是我的代码:
public class NoSkipSeekBar extends SeekBar {
Drawable mThumb;
@Override
public void setThumb(Drawable thumb) {
super.setThumb(thumb);
mThumb = thumb;
}
public Drawable getSeekBarThumb() {
return mThumb;
}
public NoSkipSeekBar(Context context) {
super(context);
}
public NoSkipSeekBar(Context context, AttributeSet attrs) {
super(context, attrs);
}
public NoSkipSeekBar(Context context, AttributeSet attrs, int defStyle) {
super(context, attrs, defStyle);
}
private boolean isDragging;
private boolean isStart = false;
private boolean isWithinThumb(MotionEvent event) {
Rect rect = getSeekBarThumb().getBounds();//increate the thumb invoke area
Rect rect1 = new Rect();
rect1.left = rect.left - 50;
rect1.right = rect.right + 50;
rect1.bottom = rect.bottom + 50;
return rect1.contains((int)event.getX(), (int)event.getY());
}
private void increment(int direction) {
if (direction != 0) {
final KeyEvent key = new KeyEvent(KeyEvent.ACTION_DOWN,
direction < 0 ? KeyEvent.KEYCODE_DPAD_LEFT : KeyEvent.KEYCODE_DPAD_RIGHT);
onKeyDown(key.getKeyCode(), key);
}
}
@Override
public boolean onTouchEvent(MotionEvent event) {
if (!isEnabled() || getSeekBarThumb() == null) return super.onTouchEvent(event);
switch (event.getAction()) {
case MotionEvent.ACTION_DOWN:
if (isWithinThumb(event)) {
isDragging = true;
isStart = true;
return super.onTouchEvent(event);
} else {
return true;
}
case MotionEvent.ACTION_UP:
isDragging = false;
if(isStart){
isStart = false;
return super.onTouchEvent(event);
}
if (isWithinThumb(event)) {
return super.onTouchEvent(event);
} else {
//final Rect r = getThumb().getBounds();
//increment((int)event.getX() - (r.left + r.right) / 2);
return true;
}
case MotionEvent.ACTION_MOVE:
if (!isDragging) return true;
break;
case MotionEvent.ACTION_CANCEL:
isDragging = false;
break;
}
return super.onTouchEvent(event);
}
}