Android 之BottomsheetDialogFragment仿抖音评论底部弹出

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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