【移动应用开发技术】android如何实现筛选菜单效果

【移动应用开发技术】android如何实现筛选菜单效果

这篇文章给大家分享的是有关android如何实现筛选菜单效果的内容。在下觉得挺实用的，因此分享给大家做个参考，一起跟随在下过来看看吧。实现步骤1、设置主题一般设置如下<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代码如下，其与上面是一样的。<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、设置内容的宽高我们通过WindowManager.LayoutParams实现。WindowManager.LayoutParams

layoutParams

=

getWindow().getAttributes();

layoutParams.width

=

screenWidth;

layoutParams.height

=

contentHeight;

layoutParams.gravity

=

Gravity.TOP;

layoutParams.flags

|=

WindowManager.LayoutParams.FLAG_NOT_TOUCH_MODAL;

//不阻塞事件传递到后面的窗口

getWindow().setAttributes(layoutParams);这里，设置layoutParams.flags|=WindowManager.LayoutParams.FLAG_NOT_TOUCH_MODAL;则后面窗口的按钮可响应触摸事件（例，HorizontalScrollView能横向滚动）。3、设置动画通过ValueAnimator实现。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进行一系列设置，对out动画加开始结束监听。enter的start()方法在onStart()中调用@Override

protected

void

onStart()

{

super.onStart();

dialogContent.post(new

Runnable()

{

@Override

public

void

run()

{

enter.start();

}

});

}通过view的post方式，enter.start()会在view

hierarchy（view树）构建完后执行（即视图构建完后执行）。view.post源码：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;

}第七行为关键代码，ViewRootImpl为视图层级的顶部，实现了view和WindowManager之间的必要协议。RunQueue：运行队列用来排入没有handler关联的view的以后工作。所以这里dialog的视图显示时会调用enter.start()方法.监听返回键：@Override

public

boolean

onKeyDown(int

keyCode,

KeyEvent

event)

{

if

(keyCode

==

KeyEvent.KEYCODE_BACK)

{

out.start();

return

true;

}

return

super.onKeyDown(keyCode,

event);

}out动画执行完后，onAnimationEnd中调用dismiss（）方法。4、在点击的view下显示出来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>这里跟上面一句的效果一样，不知有什么区别

lp.y

=

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

lp.gravity

=

Gravity.TOP;

getWindow().setAttributes(lp);

contentTop

=

location[1];

show();

}PhoneConstant.statusHeight为状态栏的高度，其通过反射获取//反射获取状态栏高度

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();

}也可通过以下方式获取Rect

outRect

=

new

Rect();

activity.getWindow().getDecorView().getWindowVisibleDisplayFrame(outRect);不过直接放在activity的onCreate中无效，只有界面绘制出来了才能获取到，可通过view.post()方式获取。效果图：另外，继承自AlertDialog的自定义dialog点击edittext不弹出软键盘，所以一般继承自Dialo