【移動應用開發(fā)技術】Android如何實現(xiàn)自定義可拖拽的懸浮按鈕DragFloatingActionButton

【移動應用開發(fā)技術】Android如何實現(xiàn)自定義可拖拽的懸浮按鈕DragFloatingActionButton

compile

'com.android.support:design:25.3.1'<android.support.design.widget.FloatingActionButton

android:layout_width="wrap_content"

android:layout_height="wrap_content"

android:layout_gravity="right|bottom"

android:src="@drawable/ic_launcher"

/>

/upload/information/20200623/125/129384.pngimport

android.animation.ObjectAnimator;

import

android.content.Context;

import

android.support.design.widget.FloatingActionButton;

import

android.util.AttributeSet;

import

android.util.Log;

import

android.view.MotionEvent;

import

android.view.animation.DecelerateInterpolator;

public

class

DragFloatActionButton

extends

FloatingActionButton

{

private

int

screenWidth;

private

int

screenHeight;

private

int

screenWidthHalf;

private

int

statusHeight;

private

int

virtualHeight;

public

DragFloatActionButton(Context

context)

{

super(context);

init();

}

public

DragFloatActionButton(Context

context,

AttributeSet

attrs)

{

super(context,

attrs);

init();

}

public

DragFloatActionButton(Context

context,

AttributeSet

attrs,

int

defStyleAttr)

{

super(context,

attrs,

defStyleAttr);

init();

}

private

void

init()

{

screenWidth

=

ScreenUtils.getScreenWidth(getContext());

screenWidthHalf

=

screenWidth

/

2;

screenHeight

=

ScreenUtils.getScreenHeight(getContext());

statusHeight

=

ScreenUtils.getStatusHeight(getContext());

virtualHeight=ScreenUtils.getVirtualBarHeigh(getContext());

}

private

int

lastX;

private

int

lastY;

private

boolean

isDrag;

@Override

public

boolean

onTouchEvent(MotionEvent

event)

{

int

rawX

=

(int)

event.getRawX();

int

rawY

=

(int)

event.getRawY();

switch

(event.getAction()

&

MotionEvent.ACTION_MASK)

{

case

MotionEvent.ACTION_DOWN:

isDrag

=

false;

getParent().requestDisallowInterceptTouchEvent(true);

lastX

=

rawX;

lastY

=

rawY;

Log.e("down>",

"getX="

+

getX()

+

"；screenWidthHalf="

+

screenWidthHalf);

break;

case

MotionEvent.ACTION_MOVE:

isDrag

=

true;

//計算手指移動了多少

int

dx

=

rawX

-

lastX;

int

dy

=

rawY

-

lastY;

//這里修復一些手機無法觸發(fā)點擊事件的問題

int

distance=

(int)

Math.sqrt(dx*dx+dy*dy);

Log.e("distance>",distance+"");

if(distance<3){//給個容錯范圍，不然有部分手機還是無法點擊

isDrag=false;

break;

}

float

x

=

getX()

+

dx;

float

y

=

getY()

+

dy;

//檢測是否到達邊緣

左上右下

x

=

x

<

0

?

0

:

x

>

screenWidth

-

getWidth()

?

screenWidth

-

getWidth()

:

x;

//

y

=

y

<

statusHeight

?

statusHeight

:

(y

+

getHeight()

>=

screenHeight

?

screenHeight

-

getHeight()

:

y);

if

(y<0){

y=0;

}

if

(y>screenHeight-statusHeight-getHeight()){

y=screenHeight-statusHeight-getHeight();

}

setX(x);

setY(y);

lastX

=

rawX;

lastY

=

rawY;

Log.e("move>",

"getX="

+

getX()

+

"；screenWidthHalf="

+

screenWidthHalf

+

"

"

+

isDrag+"

statusHeight="+statusHeight+

"

virtualHeight"+virtualHeight+

"

screenHeight"+

screenHeight+"

getHeight="+getHeight()+"

y"+y);

break;

case

MotionEvent.ACTION_UP:

if

(isDrag)

{

//恢復按壓效果

setPressed(false);

Log.e("ACTION_UP>",

"getX="

+

getX()

+

"；screenWidthHalf="

+

screenWidthHalf);

if

(rawX

>=

screenWidthHalf)

{

animate().setInterpolator(new

DecelerateInterpolator())

.setDuration(500)

.xBy(screenWidth

-

getWidth()

-

getX())

.start();

}

else

{

ObjectAnimator

oa

=

ObjectAnimator.ofFloat(this,

"x",

getX(),

0);

oa.setInterpolator(new

DecelerateInterpolator());

oa.setDuration(500);

oa.start();

}

}

Log.e("up>",isDrag+"");

break;

}

//如果是拖拽則消耗事件，否則正常傳遞即可。

return

isDrag

||

super.onTouchEvent(event);

}

}package

com.example.cmos.retrofitdemo;

import

android.app.Activity;

import

android.content.Context;

import

android.graphics.Rect;

import

android.util.DisplayMetrics;

import

android.view.Display;

import

android.view.Window;

import

android.view.WindowManager;

import

java.lang.reflect.Method;

/**

*

Created

by

gongwq

on

2017/6/14

0014.

*/

public

class

ScreenUtils

{

private

ScreenUtils()

{

/*

cannot

be

instantiated

*/

throw

new

UnsupportedOperationException("cannot

be

instantiated");

}

/**

*

獲得屏幕高度

*

*

@param

context

*

@return

*/

public

static

int

getScreenWidth(Context

context)

{

WindowManager

wm

=

(WindowManager)

context

.getSystemService(Context.WINDOW_SERVICE);

DisplayMetrics

outMetrics

=

new

DisplayMetrics();

wm.getDefaultDisplay().getMetrics(outMetrics);

return

outMetrics.widthPixels;

}

/**

*

獲得屏幕寬度

*

*

@param

context

*

@return

*/

public

static

int

getScreenHeight(Context

context)

{

WindowManager

wm

=

(WindowManager)

context

.getSystemService(Context.WINDOW_SERVICE);

DisplayMetrics

outMetrics

=

new

DisplayMetrics();

wm.getDefaultDisplay().getMetrics(outMetrics);

return

outMetrics.heightPixels;

}

/**

*

獲得狀態(tài)欄的高度

*

*

@param

context

*

@return

*/

public

static

int

getStatusHeight(Context

context)

{

int

statusHeight

=

-1;

try

{

Class<?>

clazz

=

Class.forName("ernal.R$dimen");

Object

object

=

clazz.newInstance();

int

height

=

Integer.parseInt(clazz.getField("status_bar_height")

.get(object).toString());

statusHeight

=

context.getResources().getDimensionPixelSize(height);

}

catch

(Exception

e)

{

e.printStackTrace();

}

return

statusHeight;

}

/**

*

獲取虛擬功能鍵高度

*/

public

static

int

getVirtualBarHeigh(Context

context)

{

int

vh

=

0;

WindowManager

windowManager

=

(WindowManager)

context.getSystemService(Context.WINDOW_SERVICE);

Display

display

=

windowManager.getDefaultDisplay();

DisplayMetrics

dm

=

new

DisplayMetrics();

try

{

@SuppressWarnings("rawtypes")

Class

c

=

Class.forName("android.view.Display");

@SuppressWarnings("unchecked")

Method

method

=

c.getMethod("getRealMetrics",

DisplayMetrics.class);

method.invoke(display,

dm);

vh

=

dm.heightPixels

-

windowManager.getDefaultDisplay().getHeight();

}

catch

(Exception

e)

{

e.printStackTrace();

}

return

vh;

}

public

static

int

getVirtualBarHeigh(Activity

activity)

{

int

titleHeight

=

0;

Rect

frame

=

new

Rect();

activity.getWindow().getDecorView().getWindowVisibleDisplayFrame(frame);

int

statusHeight

=

frame.top;

titleHeight

=

activity.getWindow().findViewById(Window.ID_ANDROID_CONTENT).getTop()

-

statusHeight;

return

titleHeight;

}

}dragFloatActionButton=

(DragFloatActionButton)

findViewById(R.id.floatBtn);

dragFloatActionButton.setOnClickListener(this);

@Override

public

void

onClick(View

view)

{

switch

(view.getId())

{

case

R.id.floatBtn:

PopupMenu

popupMenu=new

PopupMenu(this,view);

getMenuInflater().inflate(R.menu.pop_item,popupMenu.getMenu());

popupMenu.setOnMenuItemClickListener(new

PopupMenu.OnMenuItemClickListener()

{

@Override

public

boolean

onMenuItemClick(MenuItem

menuItem)

{

switch

(menuItem.getItemId()){

case

R.id.action_last:

Toast.makeText(TestActivity.this,""+menuItem.getItemId(),Toast.LENGTH_SHORT).show();

break;

case

R.id.action_next:

Toast.makeText(TestActivity.this,""+menuItem.getItemId(),Toast.LENGTH_SHORT).show();

break;

}