## 《代码里的世界》 —UI篇
用文字札记描绘自己 android学习之路
转载请保留出处 by Qiao
http://blog.csdn.net/qiaoidea/article/details/46417747
【导航】
- 弹出式对话框各种方案 从仿QQ消息提示框来谈弹出式对话框的实现方式 （Dialog，PopupWind。自己定义View，Activity，FragmentDialog）
- Dialog源代码解析 从源代码上看Dialog与DialogFragment
- 仿IOS ActionSheet 两种方式实现ActionSheet底部弹出菜单效果
1.概述
在讲述了弹出式对话框和对其 源代码分析之后，我们尝试来模仿一下ios中常见的弹出式按钮选项——ActionSheet。事实上样式也比較简单。从底部弹出几个按钮，提供选项菜单，同一时候出现半透明背景蒙版。
详细详情及效果參考IOS设备。这里展示下我们最后实现的各种样式及效果图：
2.分析研究
动手实现之前，先简单说两句。实现这个样式，详细要怎么做，能做成什么样，究竟该怎么用，究竟好不好用？额。不知道，似乎都看你的编写技巧和封装了。
鄙人愚笨。且写且摸索。
当然先从熟悉的自己定义View入手。使用一个线性布局LinearLayout嵌套N个Button实现。
黑色半透明背景採用单独一个View,便于包装使用。做出最主要的效果之后。封装对外接口，用String[]数组来存取每一个Button item的文本。并定义一个itemListener,设置监听item的点击事件。
OK。完毕这个并不难，假设我们想更进一层做好扩展，最好还是尝试使用DialogFragment再做一遍，另外，前面还有提到AlertDialog中使用的Builder模式，我们也来做一下，看看效果怎样。
那么，为什么不更灵活一点儿，使用我们自己定义的样式。能够切换ActionSheet风格。比方IOS6和IOS7?
详细怎么做。来理下思路。首先继承自Fragment，在OnCreateView中实现自己定义View，当然，在自己定义View中使用我们的自己定义属性，控制风格样式，另外呢。定义一个静态Builder类。负责设置数据与交互逻辑，最后通过Argument绑定到Fragment中去，实现终于效果。
3.详细实现
3.1 自己定义View实现
第一想法是用LinerLayout包指定个数的button,然后点击从底部弹出。
然后设置背景变暗。后来发现其有用到黑色透明背景的地方貌似非常多。弹窗。弹菜单，消息提示。差点儿都是。
因此这里先定义一个通用的MaskView，作用就是在窗体最前端弹出一个黑色半透明的遮罩蒙层。
1. MaskView黑色半透明蒙版
MaskView全局变量
public class MaskView extends RelativeLayout {
protected ViewGroup targetView; //将要加入到的目标view
protected boolean isShowing; //是否显示
protected long durationMillis; //显示动画持续时长
protected boolean canCancel; //能否点击外部隐藏 touchCancelOutside
protected MaskListener maskListener; //点击事件
//...
public interface MaskListener { //点击事件监听接口
void onShow();//显示
void onHide();//隐藏
}
}构造方法和初始化。设置MaskView背景黑色，75%透明度，加入到目标view，并绑定点击事件。
public MaskView(Context context, ViewGroup targetView) {
super(context);
this.targetView = targetView;
initialize();
}
protected void initialize() {
setBackgroundColor(0x88000000);
setVisibility(View.GONE);
LayoutParams lp = new LayoutParams(LayoutParams.MATCH_PARENT, LayoutParams.MATCH_PARENT);
targetView.addView(this, lp);
/**
* 设置点击事件，假设能够点击空白区域隐藏，则点击隐藏
*/
setOnClickListener(new OnClickListener() {
@Override
public void onClick(View v) {
if (canCancel) {
hide();
}
}
});
}显示show()和隐藏hide()。
使用透明动画AlphaAnimation。当动画结束运行相应监听事件。
public void show() {
if (isShowing)
return;
isShowing = true;
clearAnimation();
setVisibility(View.VISIBLE);
AlphaAnimation an = new AlphaAnimation(0, 1);
an.setDuration(durationMillis);
startAnimation(an);
if (maskListener != null)
maskListener.onShow();
}
public void hide() {
if (!isShowing)
return;
isShowing = false;
clearAnimation();
AlphaAnimation an = new AlphaAnimation(1, 0);
an.setDuration(durationMillis);
an.setAnimationListener(new AnimationListener() {
@Override
public void onAnimationStart(Animation animation) {
}
@Override
public void onAnimationRepeat(Animation animation) {
}
@Override
public void onAnimationEnd(Animation animation) {
setVisibility(View.GONE);
}
});
startAnimation(an);
if (maskListener != null)
maskListener.onHide();
}2. ActionSheet底部弹出菜单
那么这里就打算做成一个RelativeLayout。包裹一个MaskView和一个LinearLayout，这个linearLayout就是前面说的菜单按钮集合了。
打算做成什么样才干使我们调用方便？我期望是
final ActionSheet actionSheet = new ActionSheet(MainActivity.this);
actionSheet.show("确定要退出么？",new String[]{"退出" },new Action1<Integer>(){
@Override
public void invoke(Integer index) {
actionSheet.hide();
if(index==0){
MainActivity.this.finish();
}
}
});构造出来一个ActionSheet对象，然后显示的时候，显示
show(String title , String[] displayStrings, Action1 callback)
title 标题，
displayStrings 即各行item，
callback 回调，它传回的參数int表示第几个item被选中
详细实现：
ActionSheet 全局变量：
public class ActionSheet extends RelativeLayout {
protected final static long durationMillis = 200;
protected WindowManager windowManager;
protected GestureDetector gestureDetector; //手势识别
protected MaskView maskView;
protected LinearLayout actionSheetView; //实际展示线性布局
protected Button cancelButton; //取消按钮
//...
}构造方法都运行initalize()实现初始化。首先绑定MaskView,加入显示/消失事件监听。
接着初始化线性布局actionSheetView，默认不可见。位于视图底部并设置间距。其次，加入手势监听和按键监听，单点屏幕消失，按返回按钮消失。
protected void initialize() {
//初始化MaskView
maskView = new MaskView(getContext(), this);
maskView.setCanCancel(true);
maskView.setDurationMillis(durationMillis);
maskView.setOnMaskListener(new MaskListener() {
@Override
public void onShow() {
}
@Override
public void onHide() {
hide();
}
});
//初始化线性布局容器actionSheetView
actionSheetView = new LinearLayout(getContext());
actionSheetView.setOrientation(LinearLayout.VERTICAL);
actionSheetView.setVisibility(View.GONE);
RelativeLayout.LayoutParams rlp = new RelativeLayout.LayoutParams(LayoutParams.MATCH_PARENT, LayoutParams.WRAP_CONTENT);
rlp.addRule(RelativeLayout.ALIGN_PARENT_BOTTOM, RelativeLayout.TRUE); //位于父View底部
rlp.leftMargin = rlp.rightMargin = (int)applyDimension(getContext(), TypedValue.COMPLEX_UNIT_DIP, 8); //左右间距8dip
addView(actionSheetView, rlp); //加入布局
//初始化windowManager
windowManager = (WindowManager) getContext().getSystemService(Context.WINDOW_SERVICE);
//初始化手势识别事件，单点消失
gestureDetector = new GestureDetector(getContext(), new SimpleOnGestureListener() {
@Override
public boolean onSingleTapUp(MotionEvent e) {
hide();
return super.onSingleTapUp(e);
}
});
//初始化按键监听。按下返回则消失
setOnKeyListener(new OnKeyListener() {
@Override
public boolean onKey(View v, int keyCode, KeyEvent event) {
if (KeyEvent.KEYCODE_BACK == keyCode && KeyEvent.ACTION_DOWN == event.getAction()) {
hide();
return true;
}
return false;
}
});
setFocusable(true);
setFocusableInTouchMode(true);
}包装接口。
提供了各种缺省方法。达到不同的显示效果。最后运行的都是
show(String title,String[] displayStrings, boolean[] isShow,final Action1 callback, boolean hasCancelButton)
先看这些缺省方法：
//仅仅显示各行item以及点击回调
public void show(String[] displayStrings, Action1<Integer> callback) {
show(null,displayStrings, callback, true);
}
//显示各行item和点击回调，添加ishow[]的Boolean控制某行是否显示
public void show(String[] displayStrings,boolean[] isShow,Action1<Integer> callback){
show(null,displayStrings, isShow,callback, true);
}
//显示标题头，各行item以及回调
public void show(String title,String[] displayStrings, Action1<Integer> callback) {
show(title,displayStrings, callback, true);
}
//显示标题头，各行item以及回调，添加ishow[]的Boolean控制某行是否显示
public void show(String title,String[] displayStrings,boolean[] isShow,Action1<Integer> callback){
show(title,displayStrings, isShow,callback, true);
}来看终于运行的show方法:
public void show(String title,String[] displayStrings, boolean[] isShow,final Action1<Integer> callback, boolean hasCancelButton) {
/**
* 假设当前view是首次被加入到窗体。则构造WindowManager并加入到根视图
* 初始化WindowManager.LayoutParams，设置背景透明
* 左上角对齐，填充父容器
*/
if (getParent() == null) {
WindowManager.LayoutParams wlp = new WindowManager.LayoutParams();
wlp.type = WindowManager.LayoutParams.TYPE_APPLICATION;
wlp.format = PixelFormat.TRANSPARENT; //透明背景
wlp.gravity = Gravity.LEFT | Gravity.TOP; //左上角
wlp.width = LayoutParams.MATCH_PARENT;
wlp.height = LayoutParams.MATCH_PARENT;
windowManager.addView(this, wlp); //加入填充布局
}
maskView.show(); //显示透明蒙版
int mrg = (int) applyDimension(getContext(), TypedValue.COMPLEX_UNIT_DIP, 10);
LinearLayout.LayoutParams lp = new LinearLayout.LayoutParams(LayoutParams.MATCH_PARENT, LayoutParams.MATCH_PARENT);
lp.setMargins(0, mrg, 0, mrg);
actionSheetView.setVisibility(View.VISIBLE); //使actionView显示可见
actionSheetView.removeAllViews(); //清空view
/**
* 假设title不为空而且不为空格，则添加一个标题头
*/
if(null!=title&&!title.trim().equals("")){
titleTextView = new TextView(getContext());
titleTextView.setBackgroundColor(Color.TRANSPARENT);
titleTextView.setGravity(Gravity.CENTER);
titleTextView.setTextSize(TypedValue.COMPLEX_UNIT_DIP, 12);
titleTextView.setText(title);
titleTextView.setTextColor(Color.WHITE);
actionSheetView.addView(titleTextView,lp);
}
/**
* 逐行添加displayStrings中的选项到item，
* 为每一行加入点击监听，调用回调
* 依据isShow[]来控制每行显示
*/
for (int i = 0, len = displayStrings.length; i < len; i++) {
final int index = i;
Button button = new Button(getContext());
button.setBackgroundResource(R.drawable.actionsheet_red_btn);
button.setTextSize(TypedValue.COMPLEX_UNIT_DIP, 18);
button.setText(displayStrings[index]);
button.setTextColor(Color.WHITE);
button.setOnClickListener(new OnClickListener() {
@Override
public void onClick(View v) {
callback.invoke(index);//点击调用回调
}
});
if(isShow[i]) { //控制显示
button.setVisibility(View.GONE);
}
actionSheetView.addView(button, lp);
}
/**
* 依据是否有取消按钮来加入点击取消
*/
if (hasCancelButton) {
Button button = new Button(getContext());
button.setBackgroundResource(R.drawable.actionsheet_black_btn);
button.setTextSize(TypedValue.COMPLEX_UNIT_DIP, 18);
button.setTextColor(Color.WHITE);
button.setText("取消");
button.setOnClickListener(new OnClickListener() {
@Override
public void onClick(View v) {
hide();
}
});
actionSheetView.addView(button, lp);
}
//清除动画,加入从底部 显示动画效果
actionSheetView.clearAnimation();
TranslateAnimation an = new TranslateAnimation(Animation.RELATIVE_TO_SELF, 0, Animation.RELATIVE_TO_SELF, 0, Animation.RELATIVE_TO_SELF, 1, Animation.RELATIVE_TO_SELF, 0);
an.setDuration(durationMillis);
actionSheetView.startAnimation(an);
}隐藏菜单hide()方法：
public void hide() {
maskView.hide(); //隐藏MaskView
actionSheetView.clearAnimation();
TranslateAnimation an = new TranslateAnimation(Animation.RELATIVE_TO_SELF, 0, Animation.RELATIVE_TO_SELF, 0, Animation.RELATIVE_TO_SELF, 0, Animation.RELATIVE_TO_SELF, 1);
an.setDuration(durationMillis);
an.setAnimationListener(new AnimationListener() {
@Override
public void onAnimationStart(Animation animation) {
}
@Override
public void onAnimationRepeat(Animation animation) {
}
@Override
public void onAnimationEnd(Animation animation) {
actionSheetView.setVisibility(View.GONE);
if (getParent() != null)
windowManager.removeView(ActionSheet.this); //动画结束。从窗体移除当前View
}
});
actionSheetView.startAnimation(an);
}最后看看用到的几个监听事件接口和像素转换方法：
//像素转换
public static float applyDimension(Context context, int unit, float size) {
Resources r = context.getResources();
return TypedValue.applyDimension(unit, size, r.getDisplayMetrics());
}
//点击监听事件
public interface Action1<T1> {
void invoke(T1 p);
} 至此我们的自己定义View实现ActionSheet也OK了，基本能胜任日常使用了。
当然，作为一个有逼格的猿，要尝试用更方便的方法，并符合fragmentDialog的要求来做出相同的效果。
3.2 Fragment实现
使用Fragment的优点这里不再赘述，仅仅简述下要会而且能够秀的关键点：
- styleable 自己定义主题样式。可选IOS6/IOS7风格以及相应的详细配置
- Argument数据交互 通过Argument实现fragment交互数据。减少数据耦合度
- Builder模式 利用Builder构造Fragment，达到简约使用和高速构建
明白上述三点后。我们来理一下实现思路。首先定义xml样式和相应读取Attributes，接着利用在Fragment中初始化和创建界面及动画,提供展示数据和关闭（消除销毁）的接口，然后使用builder构建高速模板。最后呢。就是验收測试和移植到应用了。
1. declare-styleable和 使用Attributes读取
(1) 定义样式
先定义Actionsheet详细各个用于界面展示的可配置项，再定义两种相应配置项的两种不同实现样式，最后定义一个可选择项。用来选择使用哪种样式（即内置两种样式之中的一个）。
1.定义ActionSheet本身须要配置样式的可选项。（即在界面中同意外部配置的的地方）
<declare-styleable name="ActionSheet">
<attr name="actionSheetBackground" format="color|reference" />
<attr name="cancelButtonBackground" format="color|reference" />
<attr name="topItemBackground" format="color|reference" />
<attr name="middleItemBackground" format="color|reference" />
<attr name="bottomItemBackground" format="color|reference" />
<attr name="singleItemBackground" format="color|reference" />
<attr name="cancelButtonTextColor" format="color|reference" />
<attr name="titleColor" format="color|reference" />
<attr name="itemTextColor" format="color|reference" />
<attr name="actionSheetPadding" format="dimension|reference" />
<attr name="itemSpacing" format="dimension|reference" />
<attr name="cancelButtonMarginTop" format="dimension|reference" />
<attr name="actionSheetTextSize" format="dimension|reference" />
</declare-styleable>2.基于ActionSheet配置项来定义两种样式IOS6/IOS7
<style name="ActionSheetStyleIOS6">
<item name="actionSheetBackground">#80000000</item>
<item name="cancelButtonBackground">@drawable/as_cancel_bt_bg</item>
<item name="topItemBackground">@drawable/as_other_bt_bg</item>
<item name="middleItemBackground">@drawable/as_other_bt_bg</item>
<item name="bottomItemBackground">@drawable/as_other_bt_bg</item>
<item name="singleItemBackground">@drawable/as_other_bt_bg</item>
<item name="cancelButtonTextColor">@android:color/white</item>
<item name="itemTextColor">@android:color/black</item>
<item name="titleColor">@android:color/white</item>
<item name="actionSheetPadding">20dp</item>
<item name="itemSpacing">5dp</item>
<item name="cancelButtonMarginTop">20dp</item>
<item name="actionSheetTextSize">16sp</item>
</style>
<style name="ActionSheetStyleIOS7">
<item name="actionSheetBackground">@android:color/transparent</item>
<item name="cancelButtonBackground">@drawable/slt_as_ios7_cancel_bt</item>
<item name="topItemBackground">@drawable/slt_as_ios7_other_bt_top</item>
<item name="middleItemBackground">@drawable/slt_as_ios7_other_bt_middle</item>
<item name="bottomItemBackground">@drawable/slt_as_ios7_other_bt_bottom</item>
<item name="singleItemBackground">@drawable/slt_as_ios7_other_bt_single</item>
<item name="cancelButtonTextColor">#1E82FF</item>
<item name="itemTextColor">#1E82FF</item>
<item name="titleColor">@android:color/white</item>
<item name="actionSheetPadding">10dp</item>
<item name="itemSpacing">0dp</item>
<item name="cancelButtonMarginTop">10dp</item>
<item name="actionSheetTextSize">16sp</item>
</style>3.在styleable中定义一个选择样式的选项Actionsheets。其类型为reference,可选择的样式(可选ios6/ios7)将实现ActionSheet的详细配置项;
<declare-styleable name="ActionSheets">
<attr name="actionSheetStyle" format="reference" />
</declare-styleable>(2) 样式读取
首先相同定义一个java类，保存各种配置项和相应的值，然后我们现依据配置的样式选项来确定详细使用的样式方案，最后读取该方案下的详细配置并赋值。
1.定义详细属性样式类
/**
* actionsheet各种属性样式
*/
private static class Attributes {
Context mContext;
Drawable background;
Drawable cancelButtonBackground;
Drawable topItemBackground;
Drawable middleItemBackground;
Drawable bottomItemBackground;
Drawable singleItemBackground;
int cancelButtonTextColor;
int itemTextColor;
int titleColor;
int padding;
int itemSpacing;
int margin;
int cancelButtonMarginTop;
float textSize;
public Attributes(Context context) {
mContext = context;
this.background = new ColorDrawable(Color.TRANSPARENT);
this.cancelButtonBackground = new ColorDrawable(Color.BLACK);
ColorDrawable gray = new ColorDrawable(Color.GRAY);
this.topItemBackground = gray;
this.middleItemBackground = gray;
this.bottomItemBackground = gray;
this.singleItemBackground = gray;
this.cancelButtonTextColor = Color.WHITE;
this.titleColor = Color.WHITE;
this.itemTextColor = Color.BLACK;
this.padding = dp2px(20);
this.itemSpacing = dp2px(2);
this.margin = dp2px(5);
this.cancelButtonMarginTop = dp2px(10);
this.textSize = dp2px(16);
}
/**
* dp转像素类
* @param dp
* @return
*/
private int dp2px(int dp){
return (int) TypedValue.applyDimension(TypedValue.COMPLEX_UNIT_DIP,
dp, mContext.getResources().getDisplayMetrics());
}
/**
* 获取items按键状态相应背景
* @return
*/
public Drawable getMiddleItemBackground() {
if (middleItemBackground instanceof StateListDrawable) {
TypedArray a = mContext.getTheme().obtainStyledAttributes(null,
R.styleable.ActionSheet, R.attr.actionSheetStyle, 0);
middleItemBackground = a
.getDrawable(R.styleable.ActionSheet_middleItemBackground);
a.recycle();
}
return middleItemBackground;
}
}2.读取样式并赋值
protected Attributes initAttrs(){
Attributes attrs = new Attributes(getActivity());
TypedArray a = getActivity().getTheme().obtainStyledAttributes(null,
R.styleable.ActionSheet, R.attr.actionSheetStyle, 0);
Drawable background = a
.getDrawable(R.styleable.ActionSheet_actionSheetBackground);
if (background != null) {
attrs.background = background;
}
Drawable cancelButtonBackground = a
.getDrawable(R.styleable.ActionSheet_cancelButtonBackground);
if (cancelButtonBackground != null) {
attrs.cancelButtonBackground = cancelButtonBackground;
}
Drawable itemTopBackground = a
.getDrawable(R.styleable.ActionSheet_topItemBackground);
if (itemTopBackground != null) {
attrs.topItemBackground = itemTopBackground;
}
Drawable itemMiddleBackground = a
.getDrawable(R.styleable.ActionSheet_middleItemBackground);
if (itemMiddleBackground != null) {
attrs.middleItemBackground = itemMiddleBackground;
}
Drawable itemBottomBackground = a
.getDrawable(R.styleable.ActionSheet_bottomItemBackground);
if (itemBottomBackground != null) {
attrs.bottomItemBackground = itemBottomBackground;
}
Drawable itemSingleBackground = a
.getDrawable(R.styleable.ActionSheet_singleItemBackground);
if (itemSingleBackground != null) {
attrs.singleItemBackground = itemSingleBackground;
}
attrs.titleColor = a.getColor(
R.styleable.ActionSheet_titleColor,
attrs.titleColor);
attrs.cancelButtonTextColor = a.getColor(
R.styleable.ActionSheet_cancelButtonTextColor,
attrs.cancelButtonTextColor);
attrs.itemTextColor = a.getColor(
R.styleable.ActionSheet_itemTextColor,
attrs.itemTextColor);
attrs.padding = (int) a.getDimension(
R.styleable.ActionSheet_actionSheetPadding, attrs.padding);
attrs.itemSpacing = (int) a.getDimension(
R.styleable.ActionSheet_itemSpacing,
attrs.itemSpacing);
attrs.cancelButtonMarginTop = (int) a.getDimension(
R.styleable.ActionSheet_cancelButtonMarginTop,
attrs.cancelButtonMarginTop);
attrs.textSize = a.getDimensionPixelSize(R.styleable.ActionSheet_actionSheetTextSize, (int) attrs.textSize);
a.recycle();
return attrs;
}2. 实现Fragment界面和数据绑定
Fragment全局变量和參数：
public class ActionSheet extends Fragment implements OnClickListener{
protected WindowManager windowManager;
protected View mBackgroundView;
protected ViewGroup decorView;
protected View parent;
protected LinearLayout container; //各个item选项容器
protected Attributes mAttrs; //读取的样式參数配置
private ItemClikListener mItemClikListener; //item点击监听事件
private CancelListener mCancelListener; //取消按键监听事件
protected boolean isDismissed = true;
protected boolean isCancel = true;
/**
* 几个item的Id
*/
public static final int BG_VIEW_ID = 100;
public static final int CANCEL_BUTTON_ID = 101;
public static final int ITEM_ID = 102;
//两种样式相应key。便于外部设置
public static final int ActionSheetThemeIOS6 = R.style.ActionSheetStyleIOS6;
public static final int ActionSheetThemeIOS7 = R.style.ActionSheetStyleIOS7;
protected final static long durationMillis = 200; //显示消失动画时长
//。。。
}Fragment构造和初始化做了三件事：
@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
Bundle savedInstanceState) {
initalize();
startSlideInAnim();
return super.onCreateView(inflater, container, savedInstanceState);
}
protected void initalize() {
tryHideSoftInput(); //尝试隐藏输入法
mAttrs = initAttrs(); //读取样式
initViews(); //初始化绑定view
}
/**
* 假设输入法键盘没有隐藏，则隐藏软键盘
*/
protected void tryHideSoftInput(){
InputMethodManager imm = (InputMethodManager) getActivity()
.getSystemService(Context.INPUT_METHOD_SERVICE);
if (imm.isActive()) {
View focusView = getActivity().getCurrentFocus();
if (focusView != null) {
imm.hideSoftInputFromWindow(focusView.getWindowToken(), 0);
}
}
}
//读取样式前边已贴。。。
/**
* 初始化背景view 和 底部items
*/
protected void initViews(){
windowManager = (WindowManager) getActivity().getSystemService(Context.WINDOW_SERVICE);
FrameLayout parent = new FrameLayout(getActivity());
/**
*初始化背景view
*/
mBackgroundView = new View(getActivity());
mBackgroundView.setBackgroundColor(0x88000000);
mBackgroundView.setId(BG_VIEW_ID);
mBackgroundView.setOnClickListener(this);
FrameLayout.LayoutParams bgLayoutParams = new FrameLayout.LayoutParams(FrameLayout.LayoutParams.MATCH_PARENT,
FrameLayout.LayoutParams.MATCH_PARENT);
parent.addView(mBackgroundView);
/**
*初始化包括item选项的view
*/
container = new LinearLayout(getActivity());
FrameLayout.LayoutParams params = new FrameLayout.LayoutParams(FrameLayout.LayoutParams.MATCH_PARENT,
FrameLayout.LayoutParams.WRAP_CONTENT);
params.gravity = Gravity.BOTTOM;
container.setLayoutParams(params);
container.setOrientation(LinearLayout.VERTICAL);
createItems();
parent.addView(container);
this.parent = parent;
//获取跟试图并加入view
decorView = (ViewGroup) getActivity().getWindow().getDecorView();
decorView.addView(parent);
}创建选项并绑定数据和事件
/**
* 初始化底部items
*/
protected void createItems(){
//创建title
String mTitle = getArguments().getString(Builder.ARG_TITLE);
if(mTitle !=null){
TextView title = new TextView(getActivity());
title.getPaint().setFakeBoldText(true);
title.setTextSize(TypedValue.COMPLEX_UNIT_PX, mAttrs.textSize);
title.setText(mTitle);
title.setTextColor(mAttrs.titleColor);
title.setGravity(Gravity.CENTER);
LinearLayout.LayoutParams params = createItemLayoutParams();
int margin = mAttrs.itemSpacing > 0 ? mAttrs.itemSpacing:mAttrs.margin;
params.setMargins(margin, 0, margin, margin);
container.addView(title, params);
}
//创建items
String[] titles = getArguments().getStringArray(Builder.ARG_ITEM_TITLES);
if (titles != null) {
for (int i = 0; i < titles.length; i++) {
Button bt = new Button(getActivity());
bt.setId(ITEM_ID + i);
bt.setOnClickListener(this);
bt.setBackgroundDrawable(getItemBg(titles, i));
bt.setText(titles[i]);
bt.setTextColor(mAttrs.itemTextColor);
bt.setTextSize(TypedValue.COMPLEX_UNIT_PX, mAttrs.textSize);
if (i > 0) {
LinearLayout.LayoutParams params = createItemLayoutParams();
params.topMargin = mAttrs.itemSpacing;
container.addView(bt, params);
} else {
container.addView(bt);
}
}
}
//创建cancelbutton
String cancelText = getArguments().getString(Builder.ARG_CANCEL_TEXT);
if(cancelText != null){
Button bt = new Button(getActivity());
bt.getPaint().setFakeBoldText(true);
bt.setTextSize(TypedValue.COMPLEX_UNIT_PX, mAttrs.textSize);
bt.setId(CANCEL_BUTTON_ID);
bt.setBackgroundDrawable(mAttrs.cancelButtonBackground);
bt.setText(cancelText);
bt.setTextColor(mAttrs.cancelButtonTextColor);
bt.setOnClickListener(this);
LinearLayout.LayoutParams params = createItemLayoutParams();
params.topMargin = mAttrs.cancelButtonMarginTop;
container.addView(bt, params);
}
container.setBackgroundDrawable(mAttrs.background);
container.setPadding(mAttrs.padding, mAttrs.padding, mAttrs.padding,
mAttrs.padding);
}
Fragment展示和消失方法接口
public void show(FragmentManager manager, String tag) {
if (!isDismissed) {
return;
}
isDismissed = false;
FragmentTransaction ft = manager.beginTransaction();
ft.add(this, tag);
ft.addToBackStack(null); //同意回退栈
ft.commit();
}
public void dismiss(){
if (isDismissed) {
return;
}
isDismissed = true;
getFragmentManager().popBackStack();
FragmentTransaction ft = getFragmentManager().beginTransaction();
ft.remove(this);
ft.commit();
}显示消失相应的动画：
private void startSlideInAnim() {
container.clearAnimation();
mBackgroundView.clearAnimation();
TranslateAnimation translateAnimation = new TranslateAnimation(Animation.RELATIVE_TO_SELF, 0, Animation.RELATIVE_TO_SELF, 0, Animation.RELATIVE_TO_SELF, 1, Animation.RELATIVE_TO_SELF, 0);
translateAnimation.setDuration(durationMillis);
AlphaAnimation alphaAnimation = new AlphaAnimation(0, 1);
alphaAnimation.setDuration(durationMillis);
container.startAnimation(translateAnimation);
mBackgroundView.startAnimation(alphaAnimation);
}
private void startSlideOutAnim() {
container.clearAnimation();
TranslateAnimation translateAnimation = new TranslateAnimation(Animation.RELATIVE_TO_SELF, 0, Animation.RELATIVE_TO_SELF, 0, Animation.RELATIVE_TO_SELF, 0, Animation.RELATIVE_TO_SELF, 1);
translateAnimation.setDuration(durationMillis);
mBackgroundView.clearAnimation();
AlphaAnimation alphaAnimation = new AlphaAnimation(1, 0);
alphaAnimation.setDuration(durationMillis);
container.startAnimation(translateAnimation);
mBackgroundView.startAnimation(alphaAnimation);
}点击事件的处理：
@Override
public void onClick(View v) {
if (v.getId() == BG_VIEW_ID && !getArguments().getBoolean(Builder.ARG_CANCELABLE_ONTOUCHOUTSIDE)) {
return;
}
if (v.getId() != CANCEL_BUTTON_ID && v.getId() != BG_VIEW_ID) {
if (mItemClikListener != null) {
mItemClikListener.onitemClick(this, v.getId() - CANCEL_BUTTON_ID
- 1);
}
isCancel = false;
}
dismiss();
}Fragment销毁时处理逻辑：
@Override
public void onDestroyView() {
startSlideOutAnim();
container.postDelayed(new Runnable() {
@Override
public void run() {
decorView.removeView(parent);
}
}, durationMillis);
if (mCancelListener != null) {
mCancelListener.onCancelClick(this);
}
super.onDestroyView();
}
Fragment事件接口定义：
（注： show()差别于display()方法，show仅仅是负责展示。display负责显示/消除的切换）
protected void setActionSheetListener(ItemClikListener itemClikListener,CancelListener cancelListener){
this.mItemClikListener = itemClikListener;
this.mCancelListener = cancelListener;
}
public static interface ItemClikListener{
void onitemClick(ActionSheet actionSheet, int index);
}
public static interface CancelListener{
void onCancelClick(ActionSheet actionSheet);
}3. Builder模式封装和高速构建
通过Builder静态高速构建Fragment对象
public static Builder createBuilder(Context context,
FragmentManager fragmentManager) {
return init(context, fragmentManager);
}Builder类以及对外封装接口：
public static class Builder {
private String mTag = "ActionSheet";
private static final String ARG_TITLE = "title";
private static final String ARG_CANCEL_TEXT = "cancel_text";
private static final String ARG_ITEM_TITLES = "items_text";
private static final String ARG_CANCELABLE_ONTOUCHOUTSIDE = "cancelable_ontouchoutside";
private FragmentManager mFragmentManager;
private Context mContext;
private String mTitle;
private String mCancelButtonText;
private String[] mItemsText;
private boolean mCancelableOnTouchOutside = true;
private ItemClikListener itemClikListener;
private CancelListener cancelListener;
private boolean isThemed = false;
public Builder(Context context, FragmentManager fragmentManager) {
mContext = context;
mFragmentManager = fragmentManager;
}
public Builder setTitle(String title) {
mTitle = title;
return this;
}
public Builder setCancelText(String title) {
mCancelButtonText = title;
return this;
}
public Builder setCancelText(String title,CancelListener cancelListener) {
mCancelButtonText = title;
this.cancelListener = cancelListener;
return this;
}
public Builder setItemTexts(String... titles) {
mItemsText = titles;
return this;
}
public Builder setTheme(int resid){
isThemed = true;
mContext.setTheme(resid);
return this;
}
public Builder setTag(String tag) {
mTag = tag;
return this;
}
public Builder setItemClickListener(ItemClikListener listener) {
this.itemClikListener = listener;
return this;
}
public Builder setCancelableOnTouchOutside(boolean cancelable) {
mCancelableOnTouchOutside = cancelable;
return this;
}
public Bundle initArguments() {
Bundle bundle = new Bundle();
bundle.putString(ARG_TITLE, mTitle);
bundle.putString(ARG_CANCEL_TEXT, mCancelButtonText);
bundle.putStringArray(ARG_ITEM_TITLES, mItemsText);
bundle.putBoolean(ARG_CANCELABLE_ONTOUCHOUTSIDE,
mCancelableOnTouchOutside);
return bundle;
}
public static ActionSheet actionSheet;
public ActionSheet show() {
if(!isThemed)
setTheme(R.style.ActionSheetStyleIOS7);
if(actionSheet == null) {
actionSheet = (ActionSheet) Fragment.instantiate(
mContext, ActionSheet.class.getName(), initArguments());
actionSheet.setActionSheetListener(itemClikListener, cancelListener);
}
actionSheet.show(mFragmentManager, mTag);
return actionSheet;
}
public ActionSheet display(){
if(actionSheet == null){
if(!isThemed)
setTheme(R.style.ActionSheetStyleIOS7);
actionSheet = (ActionSheet) Fragment.instantiate(
mContext, ActionSheet.class.getName(), initArguments());
actionSheet.setActionSheetListener(itemClikListener, cancelListener);
}
if(actionSheet.isDismissed){
actionSheet.show(mFragmentManager, mTag);
}else{
actionSheet.dismiss();
}
return actionSheet;
}
}以上便是Fragment实现ActionSheet的方法，我们使用的时候，也是各种灵活：(不调用方法即不配置该项)
ActionSheet.init(this)
.setTitle("This is test title ,do you want do something？")
.setTheme(resid)
.setItemTexts("Item1", "Item2", "Item3", "Item4")
.setItemClickListener(new ItemClikListener() {
@Override
public void onitemClick(
baoyz.qiao.actionsheet.ActionSheet actionSheet,
int index) {
Toast.makeText(getApplicationContext(), "click item index = " + index,0).show();
}
})
.setCancelText("Cancel")
// .setCancelText("Cancel",new CancelListener() {
// @Override
// public void onCancelClick(ActionSheet actionSheet) {
// Toast.makeText(getApplicationContext(), "dismissed ", 0).show();
// }
// })
.show();当中,
+ setTheme() 參数可选 R.style.ActionSheetStyleIOS6 或 R.style.ActionSheetStyleIOS6 。不设置则默觉得 R.style.ActionSheetStyleIOS7。注：
+ setTitle不设置(不调用该方法) 则为无title样式
+ setCanTouchOutside(false) 点击选项外无响应，默觉得true，点击隐藏
+ setCancelText() 不设置 则不显示取消按钮。
其參数有两个，第一个string为显示内容,第二个listener为相应事件
+ show() 最后。别忘记调用show让其显示。
3.综述总结
至此，我们的ActionSheet两种样式即实现已经ok了。
日常使用也能够通过前面两种封装接口加以调用。方案github挺火。效果不好用我会乱说？！
当然感谢baoyongzhang大士的贡献及灵感。
最后额外赠送了一个线性式ActionSheetLayout布局，即演示界面的头部布局。
事实上就是一个普通的linearLayout使用。只是同意相似ActionSheet的显示隐藏效果。作为补充呢。能够自己私下尝试使用很多其它的展示样式，比方从左側或右側现实和消失。
有兴趣最好还是做一下。
关门，放代码：
演示样例demo源代码下载地址 （资源上传较慢，假设不可用。试试这里）