BottomSheetBehavior底部弹出的用法

需要的依赖: 
compile ‘com.android.support:appcompat-v7:23.2.1’ 
compile ‘com.android.support:design:23.2.1’ 
效果图如下: 

一直出现的问题是弹出窗口只显示部分,很烦人,浪费半个下午终于解决了 
下面看代码:

package com.example.mybottomdialog;

import android.os.Bundle;
import android.support.annotation.NonNull;
import android.support.design.widget.BottomSheetBehavior;
import android.support.v7.app.AppCompatActivity;
import android.support.v7.widget.LinearLayoutManager;
import android.support.v7.widget.RecyclerView;
import android.view.View;
import android.widget.Button;

import com.example.mybottomdialog.adapter.Item;
import com.example.mybottomdialog.adapter.ItemAdapter;

import java.util.ArrayList;
import java.util.List;

public class MainActivity extends AppCompatActivity {

    private Button btn_window;
    View mBottomSheet;
    BottomSheetBehavior mBehavior;

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


        btn_window = (Button) findViewById(R.id.btn_window);
        mBottomSheet = findViewById(R.id.bottomSheet);

        RecyclerView recyclerView = (RecyclerView) mBottomSheet.findViewById(R.id.recyclerview);
        mBehavior = BottomSheetBehavior.from(mBottomSheet);

        mBehavior.setBottomSheetCallback(new BottomSheetBehavior.BottomSheetCallback() {
            @Override
            public void onStateChanged(@NonNull View bottomSheet, int newState) {

            }

            @Override
            public void onSlide(@NonNull View bottomSheet, float slideOffset) {

            }
        });
        recyclerView.setLayoutManager(new LinearLayoutManager(this));
        recyclerView.setHasFixedSize(true);
        recyclerView.setAdapter(new ItemAdapter(createItems()));
        btn_window.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                if (mBehavior.getState() == BottomSheetBehavior.STATE_COLLAPSED) {
                    mBehavior.setState(BottomSheetBehavior.STATE_EXPANDED);
                } else {
                    mBehavior.setState(BottomSheetBehavior.STATE_COLLAPSED);
                }
            }
        });
    }

    public List createItems() {
        ArrayList items = new ArrayList<>();
        items.add(new Item(R.drawable.f001, "开心"));
        items.add(new Item(R.drawable.f002, "哈哈"));
        items.add(new Item(R.drawable.f003, "爱你"));
        items.add(new Item(R.drawable.f004, "汗"));
        items.add(new Item(R.drawable.f005, "晕了"));
        items.add(new Item(R.drawable.f006, "无语"));
        items.add(new Item(R.drawable.f007, "呵呵"));
        items.add(new Item(R.drawable.f008, "日"));
        return items;
    }

  /*  private void showBottomSheetDialog() {
        BottomSheetDialog bottomSheetDialog = new BottomSheetDialog(MainActivity.this);
        View view = getLayoutInflater().inflate(R.layout.sheet, null);
        RecyclerView recyclerView = (RecyclerView) view.findViewById(R.id.recyclerView);
        recyclerView.setAdapter(new ItemAdapter(createItems()));
        recyclerView.setHasFixedSize(true);
        recyclerView.setLayoutManager(new LinearLayoutManager(getParent()));
        bottomSheetDialog.setContentView(view);
        bottomSheetDialog.show();
    }*/
}

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activity_main.xml布局文件

<android.support.design.widget.CoordinatorLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:app="http://schemas.android.com/apk/res-auto"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:fitsSystemWindows="true"
    tools:context=".MainActivity">

    <LinearLayout
        android:layout_width="match_parent"
        android:layout_height="200dp"
        android:gravity="center"
        android:orientation="vertical">

        <Button
            android:id="@+id/btn_window"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:text="显示底部弹出窗口" />

    LinearLayout>


    <LinearLayout
        android:id="@+id/bottomSheet"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:layout_gravity="bottom"
        android:background="@android:color/white"
        android:elevation="4dp"
        android:orientation="vertical"
        app:behavior_hideable="true"
        app:behavior_peekHeight="0dp"
        app:layout_behavior="@string/bottom_sheet_behavior"
        tools:ignore="UnusedAttribute">


        <android.support.v7.widget.RecyclerView
            android:id="@+id/recyclerview"
            android:layout_width="match_parent"
            android:layout_height="match_parent"
            android:background="#fff" />

    LinearLayout>

android.support.design.widget.CoordinatorLayout>

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相关Adpter

package com.example.mybottomdialog.adapter;

import android.support.annotation.DrawableRes;

public class Item {

    private int mDrawableRes;

    private String mTitle;

    public Item(@DrawableRes int drawable, String title) {
        mDrawableRes = drawable;
        mTitle = title;
    }

    public int getDrawableResource() {
        return mDrawableRes;
    }

    public String getTitle() {
        return mTitle;
    }

}

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package com.example.mybottomdialog.adapter;

import android.support.v7.widget.RecyclerView;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.ImageView;
import android.widget.TextView;

import com.example.mybottomdialog.R;

import java.util.List;


public class ItemAdapter extends RecyclerView.Adapter<ItemAdapter.ViewHolder> {

    private List mItems;

    public ItemAdapter(List items) {
        mItems = items;
    }


    @Override
    public ViewHolder onCreateViewHolder(ViewGroup parent, int viewType) {
        return new ViewHolder(LayoutInflater.from(parent.getContext())
                .inflate(R.layout.item, parent, false));
    }

    @Override
    public void onBindViewHolder(ViewHolder holder, int position) {
        holder.setData(mItems.get(position));
    }

    @Override
    public int getItemCount() {
        return mItems.size();
    }

    public class ViewHolder extends RecyclerView.ViewHolder {

        public ImageView imageView;
        public TextView textView;
        public Item item;

        public ViewHolder(View itemView) {
            super(itemView);
            imageView = (ImageView) itemView.findViewById(R.id.imageView);
            textView = (TextView) itemView.findViewById(R.id.textView);
        }

        public void setData(Item item) {
            this.item = item;
            imageView.setImageResource(item.getDrawableResource());
            textView.setText(item.getTitle());
        }

    }
}

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styles.xml格式文件,这个很有用

<resources>

    
    <style name="AppTheme" parent="Theme.AppCompat.Light.DarkActionBar">
        -- Customize your theme here. -->
        <item name="colorPrimary">@color/colorPrimary
        "colorPrimaryDark">@color/colorPrimaryDark
        "colorAccent">@color/colorAccent
    style>

    <style name="AppTheme.AppBarOverlay" parent="ThemeOverlay.AppCompat.Dark.ActionBar" />

    <style name="AppTheme.PopupOverlay" parent="ThemeOverlay.AppCompat.Light" />
resources>

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item.xml文件

<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="match_parent"
    android:layout_height="wrap_content"
    android:clickable="true">

    <android.support.v7.widget.AppCompatImageView
        android:id="@+id/imageView"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:background="@drawable/f008" />

    <TextView
        android:id="@+id/textView"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_alignParentRight="true"
        android:layout_centerVertical="true"
        android:text="xx"
        android:textSize="20dp" />

RelativeLayout>

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哈哈哈,搞定了,懒得废话!代码是学coding的最好老师!

以上代码全部直接复制粘贴就可以使用，下面再给出我写的一个Demo，包含头部和底部的，加深使用的理解：

http://download.csdn.net/download/wanxuedong/10119837