1.引入

implementation 'com.android.support:design:29.1.0'

2.简单用法

• BottomDialogFragment1其中R.layout.fragment_bottom_dialog 是dialog的布局，父布局的layout_height需要设置成wrap_content。里面的子布局可以设置高度。

package com.zhangyu.bottomsheetdialog;

import android.os.Bundle;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;

import com.google.android.material.bottomsheet.BottomSheetDialogFragment;

public class BottomDialogFragment1 extends BottomSheetDialogFragment {

    @Override
    public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {
        View view = inflater.inflate(R.layout.fragment_bottom_dialog, container, false);
        initView(view);
        return view;
    }

    private void initView(View view) {

    }
}

• 调用的地方

public class MainActivity extends AppCompatActivity {

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

    public void onClick(View view) {
        switch (view.getId()){
            case R.id.bt_test_1:
                new BottomDialogFragment1().show(getSupportFragmentManager(),"BottomDialogFragment1");
                break;
        }
    }
}

3.设置圆角

• 圆角的shape

<?xml version="1.0" encoding="utf-8"?>
<shape xmlns:android="http://schemas.android.com/apk/res/android"
    android:shape="rectangle">

    <solid android:color="#FF402416" />

    <corners
        android:topLeftRadius="16dp"
        android:topRightRadius="16dp" />
</shape>

• 设置默认背景透明（解决设置圆角时默认背景白色问题）

    <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>
        <!--动画设置-->
        <item name="android:windowAnimationStyle">@style/Animation.Design.BottomSheetDialog</item>
    </style>

• BottomDialogFragment2中，在onCreateDialog中设置setStyle(STYLE_NO_TITLE, R.style.BottomDialog);

public class BottomDialogFragment2 extends BottomSheetDialogFragment {

    @Override
    public Dialog onCreateDialog(Bundle savedInstanceState) {
        setStyle(STYLE_NO_TITLE, R.style.BottomDialog);
        return super.onCreateDialog(savedInstanceState);
    }

    @Override
    public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {
        View view = inflater.inflate(R.layout.fragment_bottom_dialog, container, false);
        initView(view);
        return view;
    }

    private void initView(View view) {

    }
}

4.禁止滑动收起底部栏

• onCreateView中增加了一个 BottomSheetBehavior behavior=BottomSheetBehavior.from(getDialog().findViewById(R.id.design_bottom_sheet));
  通过behavior来控制隐藏行为
• 需要在post中进行获取getDialog否则获取不到null。java.lang.NullPointerException: Attempt to invoke virtual method ‘android.view.View android.app.Dialog.findViewById(int)’ on a null object reference

public class BottomDialogFragment3 extends BottomSheetDialogFragment {

    @Override
    public Dialog onCreateDialog(Bundle savedInstanceState) {
        setStyle(STYLE_NO_TITLE, R.style.BottomDialog);
        return super.onCreateDialog(savedInstanceState);
    }

    @Override
    public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {
        View view = inflater.inflate(R.layout.fragment_bottom_dialog, container, false);
        view.post(new Runnable() {
            @Override
            public void run() {
                //R.id.design_bottom_sheet基本是固定的,不用担心后面API的更改
                BottomSheetBehavior behavior=BottomSheetBehavior.from(getDialog().findViewById(R.id.design_bottom_sheet));
                behavior.setHideable(false);//此处设置表示禁止BottomSheetBehavior的执行
            }
        });
        initView(view);
        return view;
    }

    private void initView(View view) {

    }
}

5.传递参数重写show方法

    public void show(@NonNull FragmentManager manager, @Nullable String tag, String userName, String industry) {
        super.show(manager, tag);
        this.userName = userName;
        this.industry = industry;
    }

设置弹窗的弹出高度

        binding.root.post {
            //如果是小屏手机
            if (ScreenUtils.getAppScreenHeight() <= 1920) {
                val behavior = BottomSheetBehavior.from(requireDialog().findViewById(R.id.design_bottom_sheet))
                behavior.peekHeight = binding.airPanelMainLayout.measuredHeight
            }
        }

侧边弹出栏

https://blog.csdn.net/yu540135101/article/details/108756593