（代码有详细注释）记录一个自定义的带动画的底部弹框代码，其余dialog都不用愁了。。。
样图：

WeChat8b782129b1b871a2babb9047adbe053d.png

R.style.BottomDialog：

<style name="BottomDialog" parent="@style/Base.V7.Theme.AppCompat.Light.Dialog">
         <item name="android:windowNoTitle">true</item>
         <item name="android:windowBackground">@android:color/transparent</item>
    </style>

R.style.mypopwindow_anim_style

<style name="mypopwindow_anim_style">
        <item name="android:windowEnterAnimation">@anim/popshow_anim</item>
        <!-- 指定显示的动画xml -->
        <item name="android:windowExitAnimation">@anim/pophidden_anim</item>
        <!-- 指定消失的动画xml -->
    </style>

popshow_anim.xml

<?xml version="1.0" encoding="utf-8"?>
<set xmlns:android="http://schemas.android.com/apk/res/android">
    <translate
        android:duration="300"
        android:fromYDelta="100%p"
        android:toYDelta="0" />

    <alpha
        android:duration="300"
        android:fromAlpha="0.0"
        android:toAlpha="1.0" />
</set>

pophidden_anim

<?xml version="1.0" encoding="utf-8"?>
<set xmlns:android="http://schemas.android.com/apk/res/android">
    <translate
        android:duration="300"
        android:fromYDelta="0"
        android:toYDelta="50%p" />
    <alpha
        android:duration="300"
        android:fromAlpha="1.0"
        android:toAlpha="0.0" />
</set>

dialog完整代码

import android.app.Dialog;
import android.content.Context;
import android.os.Bundle;
import android.support.annotation.NonNull;
import android.view.Gravity;
import android.view.View;
import android.view.Window;
import android.view.WindowManager;
import android.widget.TextView;

import com.example.admin.listviewdemo.R;

public class CustomDialog extends Dialog {

    private TextView txt;

    private Context context;

    public CustomDialog(@NonNull Context context) {
        super(context, R.style.BottomDialog);//第二个参数是不设置的话dialog将无法占满设置的大小，有默认边距
        this.context = context;
    }

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

        setContentView(R.layout.dialog_custom); //设置dialog布局

        Window window = getWindow();
        WindowManager.LayoutParams params = window.getAttributes();
        params.width = WindowManager.LayoutParams.MATCH_PARENT;//设置布局属性占满宽度
        params.height = WindowManager.LayoutParams.WRAP_CONTENT;//设置布局属性适应高度
        params.gravity = Gravity.BOTTOM;//设置dialog位于底部
        params.windowAnimations = R.style.mypopwindow_anim_style;//设置dialog进入和出去的动画
        window.setAttributes(params);

        setCancelable(false);//设置点击dialog外部无效，不关闭dialog
        txt = findViewById(R.id.txt);
        txt.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View view) {
                hide();
            }
        });

    }
}