Android(安卓)Studio 入门：（五）悬浮按钮增加联系人信息

一、初步认识

FloatingActionButton：布局文件引入，继承自ImageView

属性:

app:backgroundTint	正常的背景颜色
app:rippleColor	按下时的背景颜色
app:layout_anchor	设置FAB的锚点，即以哪个控件为参照设置位置
app:layout_anchorGravity	FAB相对于锚点的位置
android:clickable	一定要设置成true否则没有点击效果

二、代码

/* * @FileName:  * @Description:  * @version:  * @Date: 2020-05-06 22:36:52 * @Author:  * @Email: 844979252@qq.com * @LastEditors: wwj * @LastEditTime: 2020-05-06 22:38:01 */package com.example.wx.myapplication;import android.app.Fragment;import android.content.Context;import android.content.DialogInterface;import android.os.Bundle;import android.support.design.widget.FloatingActionButton;import android.support.v7.app.AlertDialog;import android.support.v7.widget.AlertDialogLayout;import android.support.v7.widget.DividerItemDecoration;import android.support.v7.widget.LinearLayoutManager;import android.support.v7.widget.RecyclerView;import android.view.LayoutInflater;import android.view.View;import android.view.ViewGroup;import android.widget.EditText;import java.util.ArrayList;import java.util.List;public class contactFrament extends Fragment {    private static final String TAG = contactFrament.class.getSimpleName();    private List mList = new ArrayList<>();    private RecyclerView rcvExpandCollapse;    private Context context;    private ListuserAccounts;    public contactFrament() {    }    @Override    public View onCreateView(LayoutInflater inflater, ViewGroup container,                             Bundle savedInstanceState) {        View view = inflater.inflate(R.layout.tab_03, container, false);        context = this.getActivity();        rcvExpandCollapse = view.findViewById(R.id.recycleview2);//获取RecyclerView对象        userAccounts = new ArrayList<>();        final ExpandCollapseAdapter adapter = new ExpandCollapseAdapter(context, userAccounts);        LinearLayoutManager manager = new LinearLayoutManager(context);        rcvExpandCollapse.setLayoutManager(manager);        rcvExpandCollapse.setHasFixedSize(true);        DividerItemDecoration D = new DividerItemDecoration(context, DividerItemDecoration.VERTICAL);        rcvExpandCollapse.addItemDecoration(D);        rcvExpandCollapse.setAdapter(adapter);        adapter.setExpandCollapseDataList(userAccounts);        FloatingActionButton fab =view.findViewById(R.id.fab);        fab.setOnClickListener(new View.OnClickListener() {            @Override            public void onClick(View v) {                View view1 = LayoutInflater.from(context).inflate(R.layout.dialogview,null,false);                final EditText edname = view1.findViewById(R.id.ed_name);                final EditText edtel = view1.findViewById(R.id.ed_tel);                final EditText edmail = view1.findViewById(R.id.ed_mail);                new AlertDialog.Builder(context)                        .setTitle("添加用户")                        .setView(view1)                        .setPositiveButton("添加",new DialogInterface.OnClickListener() {                            @Override                            public void onClick(DialogInterface dialog, int which) {                                UserAccount userAccount = new UserAccount();                                userAccount.setName(edname.getText().toString().trim());                                userAccount.setTel(edtel.getText().toString().trim());                                userAccount.setMail(edmail.getText().toString().trim());                                userAccounts.add(userAccount);                                adapter.notifyDataSetChanged();                            }                        } ).setNegativeButton("取消",null).show();            }        });        return view;    }}

三、坑

FAB显示点击后没有颜色变化的效果：必须设置onClick事件。

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Android(安卓)Studio 入门：（五） 悬浮按钮增加联系人信息

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