【移动应用开发技术】怎么在Android中实现一个下拉筛选框

【移动应用开发技术】怎么在Android中实现一个下拉筛选框

今天就跟大家聊聊有关怎么在Android中实现一个下拉筛选框，可能很多人都不太了解，为了让大家更加了解，在下给大家总结了以下内容，希望大家根据这篇文章可以有所收获。public

class

ExpandTabView

extends

LinearLayout

implements

OnDismissListener

{

private

ToggleButton

selectedButton;

private

ArrayList<String>

mTextArray

=

new

ArrayList<String>();

private

ArrayList<RelativeLayout>

mViewArray

=

new

ArrayList<RelativeLayout>();

private

ArrayList<ToggleButton>

mToggleButton

=

new

ArrayList<ToggleButton>();

private

Context

mContext;

private

final

int

SMALL

=

0;

private

int

displayWidth;

private

int

displayHeight;

private

PopupWindow

popupWindow;

private

int

selectPosition;

public

ExpandTabView(Context

context)

{

super(context);

init(context);

}

public

ExpandTabView(Context

context,

AttributeSet

attrs)

{

super(context,

attrs);

init(context);

}

/**

*

根据选择的位置设置tabitem显示的值

*/

public

void

setTitle(String

valueText,

int

position)

{

if

(position

<

mToggleButton.size())

{

mToggleButton.get(position).setText(valueText);

}

}

public

void

setTitle(String

title){

}

/**

*

根据选择的位置获取tabitem显示的值

*/

public

String

getTitle(int

position)

{

if

(position

<

mToggleButton.size()

&&

mToggleButton.get(position).getText()

!=

null)

{

return

mToggleButton.get(position).getText().toString();

}

return

"";

}

/**

*

设置tabitem的个数和初始值

*/

public

void

setValue(ArrayList<String>

textArray,

ArrayList<View>

viewArray)

{

if

(mContext

==

null)

{

return;

}

LayoutInflater

inflater

=

(LayoutInflater)

mContext.getSystemService(Context.LAYOUT_INFLATER_SERVICE);

mTextArray

=

textArray;

for

(int

i

=

0;

i

<

viewArray.size();

i++)

{

final

RelativeLayout

r

=

new

RelativeLayout(mContext);

int

maxHeight

=

(int)

(displayHeight

*

0.7);

RelativeLayout.LayoutParams

rl

=

new

RelativeLayout.LayoutParams(RelativeLayout.LayoutParams.FILL_PARENT,

maxHeight);

rl.leftMargin

=

10;

rl.rightMargin

=

10;

r.addView(viewArray.get(i),

rl);

mViewArray.add(r);

r.setTag(SMALL);

ToggleButton

tButton

=

(ToggleButton)

inflater.inflate(R.layout.toggle_button,

this,

false);

addView(tButton);

View

line

=

new

TextView(mContext);

line.setBackgroundResource(R.drawable.choosebar_line);

if

(i

<

viewArray.size()

-

1)

{

LayoutParams

lp

=

new

LayoutParams(2,

LayoutParams.FILL_PARENT);

addView(line,

lp);

}

mToggleButton.add(tButton);

tButton.setTag(i);

tButton.setText(mTextArray.get(i));

r.setOnClickListener(new

OnClickListener()

{

@Override

public

void

onClick(View

v)

{

onPressBack();

}

});

r.setBackgroundColor(mContext.getResources().getColor(R.color.popup_main_background));

tButton.setOnClickListener(new

OnClickListener()

{

@Override

public

void

onClick(View

view)

{

//

initPopupWindow();

ToggleButton

tButton

=

(ToggleButton)

view;

if

(selectedButton

!=

null

&&

selectedButton

!=

tButton)

{

selectedButton.setChecked(false);

}

selectedButton

=

tButton;

selectPosition

=

(Integer)

selectedButton.getTag();

startAnimation();

if

(mOnButtonClickListener

!=

null

&&

tButton.isChecked())

{

mOnButtonClickListener.onClick(selectPosition);

}

}

});

}

}

private

void

startAnimation()

{

if

(popupWindow

==

null)

{

popupWindow

=

new

PopupWindow(mViewArray.get(selectPosition),

displayWidth,

displayHeight);

popupWindow.setAnimationStyle(R.style.PopupWindowAnimation);

popupWindow.setFocusable(false);

popupWindow.setOutsideTouchable(true);

}

if

(selectedButton.isChecked())

{

if

(!popupWindow.isShowing())

{

showPopup(selectPosition);

}

else

{

popupWindow.setOnDismissListener(this);

popupWindow.dismiss();

hideView();

}

}

else

{

if

(popupWindow.isShowing())

{

popupWindow.dismiss();

hideView();

}

}

}

private

void

showPopup(int

position)

{

View

tView

=

mViewArray.get(selectPosition).getChildAt(0);

if

(tView

instanceof

ViewBaseAction)

{

ViewBaseAction

f

=

(ViewBaseAction)

tView;

f.show();

}

if

(popupWindow.getContentView()

!=

mViewArray.get(position))

{

popupWindow.setContentView(mViewArray.get(position));

}

popupWindow.showAsDropDown(this,

0,

0);

}

/**

*

如果菜单成展开状态，则让菜单收回去

*/

public

boolean

onPressBack()

{

if

(popupWindow

!=

null

&&

popupWindow.isShowing())

{

popupWindow.dismiss();

hideView();

if

(selectedButton

!=

null)

{

selectedButton.setChecked(false);

}

return

true;

}

else

{

return

false;

}

}

private

void

hideView()

{

View

tView

=

mViewArray.get(selectPosition).getChildAt(0);

if

(tView

instanceof

ViewBaseAction)

{

ViewBaseAction

f

=

(ViewBaseAction)

tView;

f.hide();

}

}

private

void

init(Context

context)

{

mContext

=

context;

displayWidth

=

((Activity)

mContext).getWindowManager().getDefaultDisplay().getWidth();

displayHeight

=

((Activity)

mContext).getWindowManager().getDefaultDisplay().getHeight();

setOrientation(LinearLayout.HORIZONTAL);

}

@Override

public

void

onDismiss()

{

showPopup(selectPosition);

popupWindow.setOnDismissListener(null);

}

private

OnButtonClickListener

mOnButtonClickListener;

/**

*

设置tabitem的点击监听事件

*/

public

void

setOnButtonClickListener(OnButtonClickListener

l)

{

mOnButtonClickListener

=

l;

}

/**

*

自定义tabitem点击回调接口

*/

public

interface

OnButtonClickListener

{

public

void

onClick(int

selectPosition);

}

}这个代码基本就是对popupwindow进行了封装，通过对ToggleButton按钮的监听来实现popupwindow的弹出和收回。外部设置的话，也特别简单，只需要将自己定义好的布局传入到list集合中就可以。下面是MainActivity中的代码public

class

MainActivity

extends

AppCompatActivity

{

private

ExpandTabView

expandTabView;

private

ArrayList<View>

mViewArray

=

new

ArrayList<View>();

private

ViewLeft

viewLeft;

private

ViewMiddle

viewMiddle;

private

ViewRight

viewRight;

@Override

protected

void

onCreate(Bundle

savedInstanceState)

{

super.onCreate(savedInstanceState);

setContentView(R.layout.activity_main);

initView();

initVaule();

initListener();

}

private

void

initView()

{

expandTabView

=

(ExpandTabView)

findViewById(R.id.expandtab_view);

viewLeft

=

new

ViewLeft(this);

viewMiddle

=

new

ViewMiddle(this);

viewRight

=

new

ViewRight(this);

}

private

void

initVaule()

{

mViewArray.add(viewMiddle);

mViewArray.add(viewLeft);

mViewArray.add(viewRight);

ArrayList<String>

mTextArray

=

new

ArrayList<String>();

mTextArray.add("区域");

mTextArray.add("距离");

mTextArray.add("距离");

expandTabView.setValue(mTextArray,

mViewArray);

//

expandTabView.setTitle(viewLeft.getShowText(),

0);

//

expandTabView.setTitle(viewMiddle.getShowText(),

1);

//

expandTabView.setTitle(viewRight.getShowText(),

2);

}

private

void

initListener()

{

viewLeft.setOnSelectListener(new

ViewLeft.OnSelectListener()

{

@Override

public

void

getValue(String

distance,

String

showText)

{

onRefresh(viewLeft,

showText);

}

});

viewMiddle.setOnSelectListener(new

ViewMiddle.OnSelectListener()

{

@Override

public

void

getValue(String

showText)

{

onRefresh(viewMiddle,showText);

}

});

viewRight.setOnSelectListener(new

ViewRight.OnSelectListener()

{

@Override

public

void

getValue(String

distance,

String

showText)

{

onRefresh(viewRight,

showText);

}

});

}

private

void

onRefresh(View

view,

String

showText)

{

expandTabView.onPressBack();

int

position

=

getPositon(view);

if

(position

>=

0

&&

!expandTabView.getTitle(position).equals(showText))

{

expandTabView.setTitle(showText,

position);

}

//

Toast.makeText(MainActivity.this,

showText,

Toast.LENGTH_SHORT).show();