效果圖：

activity_main:

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:app="http://schemas.android.com/apk/res-auto"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="match_parent"
    android:layout_height="wrap_content"
    android:orientation="vertical"
    android:padding="8dp"
    tools:context=".MainActivity">

    <Button
        android:id="@+id/btn"
        android:text="開啟底部對話方塊"
        android:layout_width="match_parent"
        android:layout_height="wrap_content" />

</LinearLayout>
 

botton_dialog:

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:background="#fff"
    android:paddingBottom="20dp"
    android:orientation="vertical">
    <Button
        android:id="@+id/btn_open_camera"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:gravity="center"
        android:text="1"
        android:textSize="18sp" />

    <Button
        android:id="@+id/btn_choose_img"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:gravity="center"
        android:text="2"
        android:textSize="18sp" />

    <Button
        android:id="@+id/btn_cancel"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:gravity="center"
        android:text="3"
        android:textSize="18sp" />

</LinearLayout>
 

@anim/dialog_in：

<?xml version="1.0" encoding="utf-8"?>
<translate xmlns:android="http://schemas.android.com/apk/res/android"
    android:duration="200"
    android:fromYDelta="100%"
    android:toYDelta="0" />

<?xml version="1.0" encoding="utf-8"?>
<translate xmlns:android="http://schemas.android.com/apk/res/android"
    android:duration="200"
    android:fromYDelta="0"
    android:toYDelta="100%" />
 

    <style name="BottomDialog" parent="@android:style/Theme.Dialog">

        <!-- 背景透明 -->
        <item name="android:windowBackground">@android:color/transparent</item>
        <item name="android:windowContentOverlay">@null</item>
        <!-- 浮於Activity之上 -->
        <item name="android:windowIsFloating">true</item>
        <!-- 邊框 -->
        <item name="android:windowFrame">@null</item>
        <!-- Dialog以外的區域模糊效果 -->
        <item name="android:backgroundDimEnabled">true</item>
        <!-- 無標題 -->
        <item name="android:windowNoTitle">true</item>
        <!-- 半透明 -->
        <item name="android:windowIsTranslucent">true</item>
        <!-- Dialog進入及退出動畫 -->
        <item name="android:windowAnimationStyle">@style/DialogAnimation</item>
    </style>
    <!-- ActionSheet進出動畫 -->
    <style name="DialogAnimation" parent="@android:style/Animation.Dialog">
        <item name="android:windowEnterAnimation">@anim/dialog_in</item>
        <item name="android:windowExitAnimation">@anim/dialog_iout</item>
    </style>

import android.app.Dialog;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.view.Gravity;
import android.view.LayoutInflater;
import android.view.View;
import android.view.Window;
import android.view.WindowManager;
import android.widget.Button;
import android.widget.LinearLayout;
import android.widget.Toast;

public class MainActivity extends AppCompatActivity implements View.OnClickListener {

    private Button btn_botton_dialog;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);

        btn_botton_dialog = (Button) findViewById(R.id.btn);
        btn_botton_dialog.setOnClickListener(this);
    }

    @Override
    public void onClick(View view) {
        switch (view.getId()){
            case R.id.btn:
                setDialog();
                break;
            case R.id.btn_choose_img:
                Toast.makeText(this, "1", Toast.LENGTH_SHORT).show();
                break;
            case R.id.btn_open_camera:
                Toast.makeText(this, "2", Toast.LENGTH_SHORT).show();
                break;
            case R.id.btn_cancel:
                Toast.makeText(this, "3", Toast.LENGTH_SHORT).show();
                break;
        }
    }

    private void setDialog(){
        Dialog mCameraDialog = new Dialog(this, R.style.BottomDialog);
        LinearLayout root = (LinearLayout) LayoutInflater.from(this).inflate(
                R.layout.botton_dialog, null);
        //初始化檢視
        root.findViewById(R.id.btn_choose_img).setOnClickListener(this);
        root.findViewById(R.id.btn_open_camera).setOnClickListener(this);
        root.findViewById(R.id.btn_cancel).setOnClickListener(this);
        mCameraDialog.setContentView(root);
        Window dialogWindow = mCameraDialog.getWindow();
        dialogWindow.setGravity(Gravity.BOTTOM);
//        dialogWindow.setWindowAnimations(R.style.dialogstyle); // 新增動畫
        WindowManager.LayoutParams lp = dialogWindow.getAttributes(); // 獲取對話方塊當前的引數值
        lp.x = 0; // 新位置X座標
        lp.y = 0; // 新位置Y座標
        lp.width = (int) getResources().getDisplayMetrics().widthPixels; // 寬度
        root.measure(0, 0);
        lp.height = root.getMeasuredHeight();

        lp.alpha = 9f; // 透明度
        dialogWindow.setAttributes(lp);
        mCameraDialog.show();
    }
}

原始碼：https://github.com/luyaopeng/AndroidLearning.git