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: android:layout_width='25dp' android:layout_height='25dp' android:layout_alignParentRight='true' android:layout_centerVertical='true' android:layout_marginRight='20dp' android:src='https://www.haobala.com/bcjs/@mipmap/back'></ImageView> </RelativeLayout> <androidx.recyclerview.widget.RecyclerView android: 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: android:layout_width='140dp' android:src='https://www.haobala.com/bcjs/@mipmap/three' android:layout_height='match_parent' android:scaleType='centerCrop' /> </RelativeLayout></androidx.cardview.widget.CardView>
6.RecyclerView适配器是用BaseRecyclerViewAdapterHelperAndroid 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() {@Overridepublic void onClick(View view) { new BaseFullBottomSheetFragment().show(getSupportFragmentManager(), 'dialog'); } });
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