MovingFloatButton
项目介绍
自定义悬浮滑动按钮，支持在父布局中跟随手指滑动，提供了两种实现方案。
https://github.com/ccMagic/MovingFloatButton
效果图：
代码说明(实现方案)
1、FloatMovingView
public class FloatMovingView extends AppCompatTextView {
private static final String TAG = "FloatMovingView";
private float mActualX;
private float mActualY;
private float mPreX;
private float mPreY;
private float mTranslationX;
private float mTranslationY;
private ViewGroup mParentViewGroup;
private float mDefaultTopTranslationX;
private float mDefaultTopTranslationY;
private float mDefaultBottomTranslationX;
private float mDefaultBottomTranslationY;
private boolean mFirstMain = true;
private long downCurrent;
private OnClickListener mOnClickListener;
public FloatMovingView(Context context) {
this(context, null);
}
public FloatMovingView(Context context, @Nullable AttributeSet attrs) {
this(context, attrs, 0);
}
/**
* @param context The Context the view is running in, through which it can
* access the current theme, resources, etc.
* @param attrs The attributes of the XML tag that is inflating the view.
* @param defStyleAttr An attribute in the current theme that contains a
* reference to a style resource that supplies default values for
* the view. Can be 0 to not look for defaults.
*/
public FloatMovingView(Context context, @Nullable AttributeSet attrs, int defStyleAttr) {
super(context, attrs, defStyleAttr);
}
public void setOnClickListener(OnClickListener onClickListener) {
mOnClickListener = onClickListener;
}
//
@Override
public boolean onTouchEvent(MotionEvent event) {
switch (event.getAction()) {
case MotionEvent.ACTION_DOWN:
downCurrent = System.currentTimeMillis();
if (mFirstMain) {
mParentViewGroup = (ViewGroup) getParent();
//这四个数据用于防止移动出界
mDefaultTopTranslationX = getTranslationX() + getLeft();
mDefaultTopTranslationY = getTranslationY() + getTop();
//
mDefaultBottomTranslationX = mParentViewGroup.getMeasuredWidth() - getRight();
mDefaultBottomTranslationY = mParentViewGroup.getMeasuredHeight() - getBottom();
mFirstMain = false;
}
mPreX = event.getRawX();
mPreY = event.getRawY();
break;
case MotionEvent.ACTION_MOVE:
mActualX = event.getRawX();
mActualY = event.getRawY();
mTranslationX = getTranslationX() + mActualX - mPreX;
mTranslationY = getTranslationY() + mActualY - mPreY;
//防止滑动出界
if (mTranslationX < -mDefaultTopTranslationX) {
mTranslationX = -mDefaultTopTranslationX;
}
if (mTranslationY < -mDefaultTopTranslationY) {
mTranslationY = -mDefaultTopTranslationY;
}
if (mTranslationX > mDefaultBottomTranslationX) {
mTranslationX = mDefaultBottomTranslationX;
}
if (mTranslationY > mDefaultBottomTranslationY) {
mTranslationY = mDefaultBottomTranslationY;
}
setTranslationX(mTranslationX);
setTranslationY(mTranslationY);
//
mPreX = mActualX;
mPreY = mActualY;
break;
case MotionEvent.ACTION_UP:
if (mOnClickListener != null && System.currentTimeMillis() - downCurrent < 200) {
mOnClickListener.onClick(this);
}
break;
default:
break;
}
return true;
}
}
2、FloatMovingLayout
public class FloatMovingLayout extends RelativeLayout {
private SonView mView;
private int screenX;
private int screenY;
private int scrollMaxX;
private int scrollMaxY;
//
private boolean first = true;
public FloatMovingLayout(Context context) {
this(context, null);
}
public FloatMovingLayout(Context context, @Nullable AttributeSet attrs) {
this(context, attrs, 0);
}
/**
* @param context The Context the view is running in, through which it can
* access the current theme, resources, etc.
* @param attrs The attributes of the XML tag that is inflating the view.
* @param defStyleAttr An attribute in the current theme that contains a
* reference to a style resource that supplies default values for
* the view. Can be 0 to not look for defaults.
*/
public FloatMovingLayout(Context context, @Nullable AttributeSet attrs, int defStyleAttr) {
super(context, attrs, defStyleAttr);
mView = new SonView(context);
mView.setText("色块内滑动");
mView.setGravity(CENTER_IN_PARENT);
mView.setLayoutParams(new LayoutParams(150, 150));
mView.setBackgroundResource(R.mipmap.float_moving_btn);
addView(mView);
}
public void parentScroll(int x, int y) {
scrollTo(x, y);
}
public void getParentLocationOnScreen() {
int[] location = new int[2];
getLocationOnScreen(location);
screenX = location[0];
screenY = location[1];
}
private class SonView extends AppCompatTextView {
private int actualX;
private int actualY;
private int allMinusX;
private int allMinusY;
public SonView(Context context) {
this(context, null);
}
public SonView(Context context, @Nullable AttributeSet attrs) {
this(context, attrs, 0);
}
/**
* @param context The Context the view is running in, through which it can
* access the current theme, resources, etc.
* @param attrs The attributes of the XML tag that is inflating the view.
* @param defStyleAttr An attribute in the current theme that contains a
* reference to a style resource that supplies default values for
* the view. Can be 0 to not look for defaults.
*/
public SonView(Context context, @Nullable AttributeSet attrs, int defStyleAttr) {
super(context, attrs, defStyleAttr);
}
@Override
public boolean onTouchEvent(MotionEvent event) {
switch (event.getAction()) {
case MotionEvent.ACTION_DOWN:
getParentLocationOnScreen();
allMinusX = screenX + getMeasuredWidth() / 2;
allMinusY = screenY + getMeasuredHeight() / 2;
scrollMaxX = -FloatMovingLayout.this.getMeasuredWidth() + getMeasuredWidth();
scrollMaxY = -FloatMovingLayout.this.getMeasuredHeight() + getMeasuredHeight();
break;
case MotionEvent.ACTION_MOVE:
actualX = -(int) (event.getRawX() - allMinusX);
actualY = -(int) (event.getRawY() - allMinusY);
//防止滑动出界
if (actualX >= 0) {
actualX = 0;
}
if (actualY >= 0) {
actualY = 0;
}
if (actualX <= scrollMaxX) {
actualX = scrollMaxX;
}
if (actualY <= scrollMaxY) {
actualY = scrollMaxY;
}
parentScroll(actualX, actualY);
break;
case MotionEvent.ACTION_UP:
break;
default:
break;
}
return true;
}
}
}
来源：oschina
链接：https://my.oschina.net/u/3615390/blog/1822379