【移動應(yīng)用開發(fā)技術(shù)】android如何實現(xiàn)篩選菜單效果

【移動應(yīng)用開發(fā)技術(shù)】android如何實現(xiàn)篩選菜單效果

這篇文章給大家分享的是有關(guān)android如何實現(xiàn)篩選菜單效果的內(nèi)容。在下覺得挺實用的，因此分享給大家做個參考，一起跟隨在下過來看看吧。實現(xiàn)步驟1、設(shè)置主題一般設(shè)置如下<style

name="Translucent_NoTitle"

parent="android:style/Theme.Dialog">

<item

name="android:windowNoTitle">true</item>

<item

name="android:background">#00000000</item>

<item

name="android:windowBackground">@android:color/transparent</item>

<item

name="android:windowAnimationStyle">@null</item>

<item

name="android:windowIsFloating">true</item>

<item

name="android:colorBackgroundCacheHint">@null</item>

<item

name="android:windowIsTranslucent">true</item>

<item

name="android:backgroundDimEnabled">false</item><span

>

</span>背景暗淡效果

</style>也可使用android.R.style.Theme_Panel和android.R.style.Theme_Light_Panel。android.R.style.Theme_Panel代碼如下，其與上面是一樣的。<style

name="Theme.Panel">

<item

name="windowBackground">@color/transparent</item>

<item

name="colorBackgroundCacheHint">@null</item>

<item

name="windowFrame">@null</item>

<item

name="windowContentOverlay">@null</item>

<item

name="windowAnimationStyle">@null</item>

<item

name="windowIsFloating">true</item>

<item

name="backgroundDimEnabled">false</item>

<item

name="windowIsTranslucent">true</item>

<item

name="windowNoTitle">true</item>

</style>2、設(shè)置內(nèi)容的寬高我們通過WindowManager.LayoutParams實現(xiàn)。WindowManager.LayoutParams

layoutParams

=

getWindow().getAttributes();

layoutParams.width

=

screenWidth;

layoutParams.height

=

contentHeight;

layoutParams.gravity

=

Gravity.TOP;

layoutParams.flags

|=

WindowManager.LayoutParams.FLAG_NOT_TOUCH_MODAL;

//不阻塞事件傳遞到后面的窗口

getWindow().setAttributes(layoutParams);這里，設(shè)置layoutParams.flags|=WindowManager.LayoutParams.FLAG_NOT_TOUCH_MODAL;則后面窗口的按鈕可響應(yīng)觸摸事件（例，HorizontalScrollView能橫向滾動）。3、設(shè)置動畫通過ValueAnimator實現(xiàn)。enter

=

ValueAnimator.ofFloat(0,

1f).setDuration(350);

enter.addUpdateListener(new

ValueAnimator.AnimatorUpdateListener()

{

@Override

public

void

onAnimationUpdate(ValueAnimator

animation)

{

dialogContent.setTranslationY((1

-

animation.getAnimatedFraction())

*

-contentHeight);

}

});

out

=

ValueAnimator.ofFloat(0,

1f).setDuration(350);

out.addUpdateListener(new

ValueAnimator.AnimatorUpdateListener()

{

@Override

public

void

onAnimationUpdate(ValueAnimator

animation)

{

dialogContent.setTranslationY(animation.getAnimatedFraction()

*

-contentHeight);

}

});

out.addListener(new

Animator.AnimatorListener()

{

@Override

public

void

onAnimationStart(Animator

animation)

{

}

@Override

public

void

onAnimationEnd(Animator

animation)

{

dismiss();

}

@Override

public

void

onAnimationCancel(Animator

animation)

{

}

@Override

public

void

onAnimationRepeat(Animator

animation)

{

}

});上面enter和out進行一系列設(shè)置，對out動畫加開始結(jié)束監(jiān)聽。enter的start()方法在onStart()中調(diào)用@Override

protected

void

onStart()

{

super.onStart();

dialogContent.post(new

Runnable()

{

@Override

public

void

run()

{

enter.start();

}

});

}通過view的post方式，enter.start()會在view

hierarchy（view樹）構(gòu)建完后執(zhí)行（即視圖構(gòu)建完后執(zhí)行）。view.post源碼：public

boolean

post(Runnable

action)

{

final

AttachInfo

attachInfo

=

mAttachInfo;

if

(attachInfo

!=

null)

{

return

attachInfo.mHandler.post(action);

}

//

Assume

that

post

will

succeed

later

ViewRootImpl.getRunQueue().post(action);

return

true;

}第七行為關(guān)鍵代碼，ViewRootImpl為視圖層級的頂部，實現(xiàn)了view和WindowManager之間的必要協(xié)議。RunQueue：運行隊列用來排入沒有handler關(guān)聯(lián)的view的以后工作。所以這里dialog的視圖顯示時會調(diào)用enter.start()方法.監(jiān)聽返回鍵：@Override

public

boolean

onKeyDown(int

keyCode,

KeyEvent

event)

{

if

(keyCode

==

KeyEvent.KEYCODE_BACK)

{

out.start();

return

true;

}

return

super.onKeyDown(keyCode,

event);

}out動畫執(zhí)行完后，onAnimationEnd中調(diào)用dismiss（）方法。4、在點擊的view下顯示出來public

void

showAsDropView(View

view)

{

WindowManager.LayoutParams

lp

=

getWindow().getAttributes();

lp.width

=

screenWidth;

int[]

location

=

new

int[2];

view.getLocationOnScreen(location);

//

view.getLocationInWindow(location);<span

>

</span>這里跟上面一句的效果一樣，不知有什么區(qū)別

lp.y

=

location[1]-PhoneConstant.statusHeight+view.getHeight();

lp.gravity

=

Gravity.TOP;

getWindow().setAttributes(lp);

contentTop

=

location[1];

show();

}PhoneConstant.statusHeight為狀態(tài)欄的高度，其通過反射獲取//反射獲取狀態(tài)欄高度

Class<?>

c

=

null;

Object

obj

=

null;

Field

field

=

null;

int

x

=

0,

sbar

=

0;

try

{

c

=

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

obj

=

c.newInstance();

field

=

c.getField("status_bar_height");

x

=

Integer.parseInt(field.get(obj).toString());

PhoneConstant.statusHeight

=

getResources().getDimensionPixelSize(x);

}

catch(Exception

e1)

{

e1.printStackTrace();

}也可通過以下方式獲取Rect

outRect

=

new

Rect();

activity.getWindow().getDecorView().getWindowVisibleDisplayFrame(outRect);不過直接放在activity的onCreate中無效，只有界面繪制出來了才能獲取到，可通過view.post()方式獲取。效果圖：另外，繼承自AlertDialog的自定義dialog點擊edittext不彈出軟鍵盤，所以一般繼承自Dialo