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首先我们需要在资源文件中定义dialog样式；由于系统默认的样式有标题栏，有边框，背景颜色也不符合我们的业务需求，所以我们需要自己定义样式

<style name="ios_bottom_dialog" parent="android:style/Theme.Dialog">
        <!--背景颜色及和透明程度-->
        <item name="android:windowBackground">@color/transparent</item>
        <!--是否去除标题 -->
        <item name="android:windowNoTitle">true</item>
        <!--是否去除边框-->
        <item name="android:windowFrame">@null</item>
        <!--是否浮现在activity之上-->
        <item name="android:windowIsFloating">true</item>
        <!--是否模糊-->
        <item name="android:backgroundDimEnabled">true</item>
        <!--背景透明度-->
        <item name="android:backgroundDimAmount">0.2</item>
    </style>

定义一个dialog，基本上以上定义以上几个属性就可以了

第二步我们就要写布局文件了，布局文件可以分成上中下三部分，上下部分很简单，就是两个textView，用来表示标题和cancel按钮；中间为了拓展性，没有定义具体按钮而是用LinearLayout，具体内容可以在代码中设置；

<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
              android:layout_width="match_parent"
              android:layout_height="wrap_content"
    android:paddingBottom="10dp"
    android:background="@android:color/transparent"
    android:alpha="0.9">

    <LinearLayout
        android:id="@+id/bottom_dialog_ll"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:background="@drawable/bottom_dialog_selector"
        android:orientation="vertical">
        <TextView
            android:id="@+id/bottom_dialog_title_tv"
            android:layout_width="match_parent"
            android:layout_height="wrap_content"
            android:layout_margin="8dp"
            android:clickable="false"
            android:gravity="center"
            android:textSize="20dp" />
        <View android:id="@+id/bottom_dialog_title_line"
              android:layout_width="match_parent"
              android:layout_height="0.3dp"
              android:background="@color/black_444444" />
        <LinearLayout
            android:id="@+id/options_ll"
            android:orientation="vertical"
            android:gravity="center"
            android:layout_width="match_parent"
            android:layout_height="wrap_content" />
    </LinearLayout>
    <TextView
        android:layout_below="@+id/bottom_dialog_ll"
        android:layout_marginTop="8dp"
        android:id="@+id/bottom_dialog_cancel_tv"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:background="@drawable/bottom_dialog_selector"
        android:gravity="center"
        android:padding="8dp"
        android:textColor="@color/text_color_green_013ADF"
        android:text="@string/cancel"
        android:textSize="20dp" />

</RelativeLayout>

接下来是程序部分，自定义一个BottomDialog类继承Dialog;代码如下

public class BottomDialog extends Dialog {
    private static final int DEFAULT_PADDING = 10;
    private static final int DEFAULT_TITLE_SIZE = 15;
    private static final int DEFAULT_OPTION_SIZE = 20;

    private TextView title;
    private View title_line;
    private LinearLayout options_ll;
    private IosBottomDialogDismissListener dismissListener;

    public BottomDialog(Context context) {
        //设置自定义的style
        this(context, R.style.ios_bottom_dialog);
    }

    public BottomDialog(Context context, int themeResId) {
        super(context, themeResId);
        setContentView(R.layout.ios_bottom_dialog);
        initView();
    }

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
    }

    private void initView() {
        title = (TextView) findViewById(R.id.bottom_dialog_title_tv);
        title_line = findViewById(R.id.bottom_dialog_title_line);
        options_ll = (LinearLayout) findViewById(R.id.options_ll);
        findViewById(R.id.bottom_dialog_cancel_tv).setOnClickListener(new View.OnClickListener() {
            @Override public void onClick(View v) {
                BottomDialog.this.dismiss();
            }
        });
        //点击空白区域可以取消dialog
        this.setCanceledOnTouchOutside(true);
        // 点击back键可以取消dialog
        this.setCancelable(true);
        Window window = this.getWindow();
        //让Dialog显示在屏幕的底部
        window.setGravity(Gravity.BOTTOM);
        //设置窗口出现和窗口隐藏的动画
        window.setWindowAnimations(R.style.ios_bottom_dialog_anim);
        //设置BottomDialog的宽高属性
        WindowManager.LayoutParams lp = window.getAttributes();
        lp.width = WindowManager.LayoutParams.MATCH_PARENT;
        lp.width = WindowManager.LayoutParams.WRAP_CONTENT;
        window.setAttributes(lp);
    }

    public void setTitle(String text) {
        title.setText(text);
    }

    private void setIosBottomDialogDismissListener(IosBottomDialogDismissListener listener) {
        this.dismissListener = listener;
    }


    public interface OnOptionClickListener {
        void onOptionClick();
    }

    public interface IosBottomDialogDismissListener {
        void onDismiss();
    }


    public static class Builder {
        private Paraments p;
        private Context context;

        public Builder(Context context) {
            p = new Paraments();
            this.context = context;
        }

        public Builder setTitle(String title, int color) {
            p.title = title;
            p.titleColor = color;
            return this;
        }

        public Builder addOption(String option, int color, OnOptionClickListener listener) {
            p.options.add(new Option(option, color, listener));
            return this;
        }

        public Builder setDialogDismissListener(IosBottomDialogDismissListener listener) {
            p.dismisslistener = listener;
            return this;
        }

        private int dp2px(float dipValue, Context context) {
            float scale = context.getResources().getDisplayMetrics().density;
            return (int) (dipValue * scale + 0.5f);
        }

        public BottomDialog create() {
            final BottomDialog dialog = new BottomDialog(context);
            final LinearLayout.LayoutParams params = new LinearLayout.LayoutParams(ViewGroup.LayoutParams.MATCH_PARENT, 1);
            if (p.title.isEmpty()) {
                //设置标题栏不可见
                dialog.title.setVisibility(View.GONE);
                dialog.title_line.setVisibility(View.GONE);
            } else {
                dialog.title.setText(p.title);
                dialog.title.setTextColor(p.titleColor);
                dialog.title.setTextSize(p.titleSize);
                //设置标题栏可见
                dialog.title.setVisibility(View.VISIBLE);
                dialog.title_line.setVisibility(View.VISIBLE);
            }
            //设置item项点击之后的效果
            if (p.options.size() == 0) {
                dialog.options_ll.setVisibility(View.GONE);
            } else {
                for (int i = 0; i < p.options.size(); i++) {
                    final Option option = p.options.get(i);
                    final TextView optionText = new TextView(context);
                    int padding = dp2px(BottomDialog.DEFAULT_PADDING, context);
                    optionText.setPadding(padding, padding, padding, padding);
                    optionText.setText(option.getName());
                    optionText.setTextSize(p.optionTextSize);
                    optionText.setGravity(Gravity.CENTER);
                    optionText.setTextColor(context.getResources().getColor(R.color.text_color_green_013ADF));
                    optionText.setOnClickListener(new View.OnClickListener() {
                        @Override
                        public void onClick(View v) {
                            dialog.dismiss();
                            if (option.getListener() != null) {
                                option.getListener().onOptionClick();
                            }
                        }
                    });
                    dialog.options_ll.addView(optionText);
                    //添加条目之间的分割线
                    if (i != p.options.size() - 1) {
                        View divider = new View(context);
                        divider.setBackgroundResource(R.color.black_444444);
                        dialog.options_ll.addView(divider, params);
                    }
                    //选择到底使用哪个selector文件
                    if (p.options.size() == 1) {
                        if (p.title.isEmpty()) {
                            optionText.setBackgroundResource(R.drawable.bottom_dialog_option13);
                        } else {
                            optionText.setBackgroundResource(R.drawable.bottom_dialog_option3);
                        }
                    } else if (i == 0) {
                        if (p.title.isEmpty()) {
                            optionText.setBackgroundResource(R.drawable.bottom_dialog_option1);
                        } else {
                            optionText.setBackgroundResource(R.drawable.bottom_dialog_option2);
                        }
                    } else if (i < p.options.size() - 1) {
                        optionText.setBackgroundResource(R.drawable.bottom_dialog_option2);
                    } else {
                        optionText.setBackgroundResource(R.drawable.bottom_dialog_option3);
                    }
                }
            }
            //对话框dismiss之后的监听
            dialog.setIosBottomDialogDismissListener(p.dismisslistener);
            return dialog;
        }
    }

    //这个类保存了dialog的众多参数
    private static class Paraments {
        int titleSize;
        int optionTextSize;
        String title;
        int titleColor;
        boolean cancelable;
        List<Option> options;
        BottomDialog.IosBottomDialogDismissListener dismisslistener;

        Paraments() {
            title = "";
            titleColor = R.color.gray_title;
            cancelable = true;
            options = new ArrayList<>();
            titleSize = DEFAULT_TITLE_SIZE;
            optionTextSize = DEFAULT_OPTION_SIZE;
        }
    }

    private static class Option {
        private String name;
        private int color;
        private BottomDialog.OnOptionClickListener listener;

        public Option() {
        }

        Option(String name, int color, BottomDialog.OnOptionClickListener listener) {
            this.name = name;
            this.color = color;
            this.listener = listener;
        }

        public String getName() {
            return name;
        }

        public void setName(String name) {
            this.name = name;
        }

        public int getColor() {
            return color;
        }

        public void setColor(int color) {
            this.color = color;
        }

        BottomDialog.OnOptionClickListener getListener() {
            return listener;
        }

        public void setListener(BottomDialog.OnOptionClickListener listener) {
            this.listener = listener;
        }
    }
}

在构造方法中设置style、布局，关键代码都有注释；然后就是设置出现于隐藏动画，代码如下

<!--dialog进入动画-->
<translate xmlns:android="http://schemas.android.com/apk/res/android"
    android:duration="300"
    android:fromYDelta="100%p"
    android:toYDelta="0" />

<!--dialog退出动画-->
<translate xmlns:android="http://schemas.android.com/apk/res/android"
    android:duration="300"
    android:fromYDelta="0"
    android:toYDelta="100%p" />

写好动画后，在style文件中引用，代码如下

<!-- 弹窗动画 由下至上 -->
    <style name="ios_bottom_dialog_anim" parent="@android:style/Animation.Dialog">
        <item name="@android:windowEnterAnimation">@anim/ios_dialog_enter</item>
        <!-- 进入时的动画 -->
        <item name="@android:windowExitAnimation">@anim/ios_dialog_exit</item>
        <!-- 退出时的动画 -->
    </style>

这样我们的dialog就完成了，程序中用到的一些资源文件没有贴出来，大家可以自己定义。