Android 之BottomsheetDialogFragment仿抖音评论底部弹出对话框效果(实例代码)

实现的效果图：

自定义fragment继承bottomsheetdialogfragment
重写它的三个方法：
oncreatedialog（）
oncreateview（）
onstart（）
他们的执行顺序是从上到下

import android.app.dialog;
import android.content.context;
import android.graphics.color;
import android.graphics.drawable.colordrawable;
import android.os.bundle;
import android.util.log;
import android.view.layoutinflater;
import android.view.view;
import android.view.viewgroup;
import android.widget.framelayout;
import android.widget.imageview;
import androidx.annotation.nonnull;
import androidx.annotation.nullable;
import androidx.coordinatorlayout.widget.coordinatorlayout;
import androidx.recyclerview.widget.gridlayoutmanager;
import androidx.recyclerview.widget.recyclerview;
import com.google.android.material.bottomsheet.bottomsheetbehavior;
import com.google.android.material.bottomsheet.bottomsheetdialog;
import com.google.android.material.bottomsheet.bottomsheetdialogfragment;
import java.util.arraylist;
import java.util.list;

/**
 * @author: david.lvfujiang
 * @date: 2019/11/14
 * @describe:
 */
public class basefullbottomsheetfragment extends bottomsheetdialogfragment {

 private list<shareitem> msharelist = new arraylist<>();
 private int[] imgarry= {r.mipmap.five,r.mipmap.four,r.mipmap.one,r.mipmap.three};
 private context mcontext;
 private view view;

 public static basefullbottomsheetfragment getinstance() {
  return new basefullbottomsheetfragment();
 }
 @nonnull
 @override
 public dialog oncreatedialog(@nullable bundle savedinstancestate) {
  log.e("tag", "oncreatedialog: ");
  //返回bottomsheetdialog的实例

  return new bottomsheetdialog(this.getcontext());
 }


 @override
 public void onstart() {
  log.e("tag", "onstart: ");
  super.onstart();
  //获取dialog对象
  bottomsheetdialog dialog = (bottomsheetdialog) getdialog();
  //把windowsd的默认背景颜色去掉，不然圆角显示不见
  dialog.getwindow().findviewbyid(r.id.design_bottom_sheet).setbackgrounddrawable(new colordrawable(color.transparent));
  //获取diglog的根部局
  framelayout bottomsheet = dialog.getdelegate().findviewbyid(r.id.design_bottom_sheet);
  if (bottomsheet != null) {
   //获取根部局的layoutparams对象
   coordinatorlayout.layoutparams layoutparams = (coordinatorlayout.layoutparams) bottomsheet.getlayoutparams();
   layoutparams.height = getpeekheight();
   //修改弹窗的最大高度，不允许上滑（默认可以上滑）
   bottomsheet.setlayoutparams(layoutparams);

   final bottomsheetbehavior<framelayout> behavior = bottomsheetbehavior.from(bottomsheet);
   //peekheight即弹窗的最大高度
   behavior.setpeekheight(getpeekheight());
   // 初始为展开状态
   behavior.setstate(bottomsheetbehavior.state_expanded);
   imageview mreback = view.findviewbyid(r.id.re_back_img);
   //设置监听
   mreback.setonclicklistener(new view.onclicklistener() {
    @override
    public void onclick(view view) {
     //关闭弹窗
     behavior.setstate(bottomsheetbehavior.state_hidden);
    }
   });
  }

 }

 /**
  * 弹窗高度，默认为屏幕高度的四分之三
  * 子类可重写该方法返回peekheight
  *
  * @return height
  */
 protected int getpeekheight() {
  int peekheight = getresources().getdisplaymetrics().heightpixels;
  //设置弹窗高度为屏幕高度的3/4
  return peekheight - peekheight / 3;
 }


 @nullable
 @override
 public view oncreateview(layoutinflater inflater, @nullable viewgroup container, @nullable bundle savedinstancestate) {
  mcontext = getcontext();
  log.e("tag", "oncreateview: ");
  view = inflater.inflate(r.layout.layoyt_bottomsheet, container, false);
  initdata();
  initviews(view);
  return view;
 }

 private void initviews(view view) {
  recyclerview recyclerview = view.findviewbyid(r.id.fragment_share_recyclerview);
  recyclerview.setlayoutmanager(new gridlayoutmanager(mcontext, 3));
  recyclercommonadapter adapter = new recyclercommonadapter(r.layout.recyclear_item, msharelist);
  recyclerview.setadapter(adapter);
 }

 private void initdata() {

  for (int i = 0; i < 30; i++) {
   shareitem item = new shareitem();
   item.seticon(imgarry[i%4]);
   msharelist.add(item);
  }

 }

}

有以下几点需要注意：

1.去掉窗口的background，窗口的background默认是白色的，如果不处理我们的根部局设置圆角背景的时候是没有效果的

 dialog.getwindow().findviewbyid(r.id.design_bottom_sheet).setbackgrounddrawable
(new colordrawable
(color.transparent));

2.固定窗口的高度，窗口默认可以向上滑动直到铺满整个屏幕recyclerview才开始滑动

 bottomsheetdialog dialog = (bottomsheetdialog) getdialog();
  //把windowsd的默认背景颜色去掉，不然圆角显示不见
  dialog.getwindow().findviewbyid(r.id.design_bottom_sheet).setbackgrounddrawable(new colordrawable(color.transparent));
  //获取diglog的根部局
  framelayout bottomsheet = dialog.getdelegate().findviewbyid(r.id.design_bottom_sheet);
  if (bottomsheet != null) {
   //获取根部局的layoutparams对象
   coordinatorlayout.layoutparams layoutparams = (coordinatorlayout.layoutparams) bottomsheet.getlayoutparams();
   layoutparams.height = getpeekheight();
   //修改弹窗的最大高度，不允许上滑（默认可以上滑）
   bottomsheet.setlayoutparams(layoutparams);

   final bottomsheetbehavior<framelayout> behavior = bottomsheetbehavior.from(bottomsheet);
   //peekheight即弹窗的最大高度
   behavior.setpeekheight(getpeekheight());
   // 初始为展开状态
   behavior.setstate(bottomsheetbehavior.state_expanded);
   imageview mreback = view.findviewbyid(r.id.re_back_img);
   //设置监听
   mreback.setonclicklistener(new view.onclicklistener() {
    @override
    public void onclick(view view) {
     //关闭弹窗
     behavior.setstate(bottomsheetbehavior.state_hidden);
    }
   });
  }

3.fragment加载的布局文件

<linearlayout xmlns:android="http://schemas.android.com/apk/res/android"
 android:layout_width="match_parent"
 android:layout_height="wrap_content"
 android:background="@drawable/leave_message_radiobutton_background"

 android:orientation="vertical">

 <relativelayout
  android:layout_width="match_parent"
  android:layout_height="@dimen/dp_40">

  <textview
   android:layout_width="wrap_content"
   android:layout_height="wrap_content"
   android:layout_centerinparent="true"
   android:text="100条评论"
   android:textsize="15dp"
   android:textstyle="bold"></textview>

  <imageview
   android:id="@+id/re_back_img"
   android:layout_width="25dp"
   android:layout_height="25dp"
   android:layout_alignparentright="true"
   android:layout_centervertical="true"
   android:layout_marginright="20dp"
   android:src="@mipmap/back"></imageview>
 </relativelayout>

 <androidx.recyclerview.widget.recyclerview
  android:id="@+id/fragment_share_recyclerview"
  android:layout_width="match_parent"
  android:layout_height="wrap_content"
  android:layout_margintop="8dp"
  android:layout_marginbottom="8dp" />

</linearlayout>

4.fragment布局的圆角背景

<shape xmlns:android="http://schemas.android.com/apk/res/android"
 android:shape="rectangle">
 <!-- 填充 -->
 <solid android:color="#ffffff" />
 <!-- 圆角 -->
 <corners android:radius="15dp" />
</shape>

5.recyclerview的item布局

<?xml version="1.0" encoding="utf-8"?>
<androidx.cardview.widget.cardview xmlns:android="http://schemas.android.com/apk/res/android"
 xmlns:app="http://schemas.android.com/apk/res-auto"
 android:layout_width="match_parent"
 android:layout_height="140dp"
 android:layout_margin="8dp"
 app:cardcornerradius="8dp"
 app:cardelevation="4dp">

 <relativelayout
  android:layout_width="match_parent"
  android:layout_height="match_parent"
  android:padding="8dp">

  <imageview
   android:id="@+id/img_recy_item_1_pic"
   android:layout_width="140dp"
   android:src="@mipmap/three"
   android:layout_height="match_parent"
   android:scaletype="centercrop" />
 </relativelayout>
</androidx.cardview.widget.cardview>

6.recyclerview适配器是用baserecyclerviewadapterhelper
android 中recyclerview通用适配器的实现

package com.example.bottomsheetdialogapplication;

import androidx.annotation.nullable;

import com.chad.library.adapter.base.basequickadapter;
import com.chad.library.adapter.base.baseviewholder;

import java.util.list;
import java.util.map;

/**
 * @author: david.lvfujiang
 * @date: 2019/10/30
 * @describe:
 */
public class recyclercommonadapter extends basequickadapter<shareitem, baseviewholder> {


 public recyclercommonadapter(int layoutresid, @nullable list<shareitem> data) {
  super(layoutresid, data);
 }

 @override
 protected void convert(baseviewholder helper, shareitem item) {
  helper.setimageresource(r.id.img_recy_item_1_pic, item.geticon());
  helper.addonclicklistener(r.id.img_recy_item_1_pic);
 }
}

7. 调用

button button = findviewbyid(r.id.on);
  button.setonclicklistener(new view.onclicklistener() {
@override
public void onclick(view view) {
  new basefullbottomsheetfragment().show(getsupportfragmentmanager(), "dialog");
  }
  });

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