ListView 使用

package com.example.ex_2;

import androidx.appcompat.app.AppCompatActivity;

import android.app.AlertDialog;
import android.content.Intent;
import android.net.Uri;
import android.content.DialogInterface;
import android.os.Bundle;
import android.util.Log;
import android.view.ContextMenu;
import android.view.MenuItem;
import android.view.View;
import android.widget.AdapterView;
import android.widget.EditText;
import android.widget.ListView;

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

public class Remark extends AppCompatActivity {
    public static String TAG = "mydebug";
    private ListView mListView;
    private List<BeanRemark> datas = new ArrayList<BeanRemark>();
    private RemarkAdopter adopter;
    private View view;
    ViewHoder viewHoder;
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_re_mark);
        initDatas();
        //获取listview
        mListView = (ListView) findViewById(R.id.lv1);
        //设置适配器
        adopter = new RemarkAdopter(this, datas);
        mListView.setAdapter(adopter);
        this.registerForContextMenu(mListView);
    }
    private void initDatas()
    {
        BeanRemark data;
        data = new BeanRemark(1, "通知1", "2019.12.16", "要去学习");
        datas.add(data);
        data = new BeanRemark(1, "通知2", "2019.10.16", "要去学习");
        datas.add(data);
        data = new BeanRemark(1, "通知3", "2019.11.16", "要去学习");
        datas.add(data);
        data = new BeanRemark(1, "通知4", "2019.10.16", "要去学习");
        datas.add(data);
    }

    @Override
    public void onCreateContextMenu(ContextMenu menu, View v, ContextMenu.ContextMenuInfo menuInfo)
    {
        super.onCreateContextMenu(menu, v, menuInfo);
        menu.setHeaderTitle("选择操作");
        menu.add(1, 1, 0, "增加");
        menu.add(1, 2, 1, "编辑");
        menu.add(1, 3, 2, "删除");
        view = this.getLayoutInflater().inflate(R.layout.dialog_edit, null);
    }

    public boolean onContextItemSelected(MenuItem item)
    {
        AdapterView.AdapterContextMenuInfo menuInfo = (AdapterView.AdapterContextMenuInfo) item.getMenuInfo();
        int id  = menuInfo.position;
        BeanRemark data = (BeanRemark) datas.get(id);
        Log.d(TAG, "postion: " + id);
        AlertDialog.Builder builder = new AlertDialog.Builder(this);
//        setContentView(R.layout.dialog_edit);
        viewHoder = new ViewHoder();
        switch (item.getItemId())
        {
            case 1:
                viewHoder.title = (EditText) view.findViewById(R.id.etx1);
                viewHoder.time = (EditText) view.findViewById(R.id.etx2);
                viewHoder.content = (EditText) view.findViewById(R.id.etx3);

                builder.setView(view);
                builder.setTitle("添加");
                builder.setPositiveButton("确定", new addClick());
                builder.setNegativeButton("取消", new exitClick());
                builder.create();
                builder.show();
                break;
            case 2:
                viewHoder.title = (EditText) view.findViewById(R.id.etx1);
                viewHoder.time = (EditText) view.findViewById(R.id.etx2);
                viewHoder.content = (EditText) view.findViewById(R.id.etx3);
                builder.setView(view);
                builder.setTitle("编辑").setView(view);
                Log.d(TAG, "onContextItemSelected:"+data.toString() + "id = " + id);
                viewHoder.title.setText(data.getTitle());
                viewHoder.time.setText(data.getTime());
                viewHoder.content.setText(data.getContent());
                builder.setPositiveButton("确定", new editClick(id));
                builder.setNegativeButton("取消", new exitClick());
                builder.create();
                builder.show();
                break;
            case 3:
                builder.setTitle("删除");
                builder.setPositiveButton("确定", new delClick(id));
                builder.setNegativeButton("取消", new exitClick());
                builder.create();
                builder.show();
                break;
        }
        return super.onContextItemSelected(item);
    }

    //添加元素
    class addClick implements DialogInterface.OnClickListener
    {
        BeanRemark data;
        @Override
        public void onClick(DialogInterface dialog, int which) {
            data = new BeanRemark(1, viewHoder.title.getText().toString(), viewHoder.time.getText().toString(),
                    viewHoder.content.getText().toString());
            Log.d(TAG, "onClick: " + data.toString());
            datas.add(data);
            adopter.notifyDataSetChanged();
        }
    }

    //编辑元素
    class editClick implements DialogInterface.OnClickListener
    {
        BeanRemark data;
        int id;

        public editClick(int id)
        {
            this.id = id;
        }

        @Override
        public void onClick(DialogInterface dialog, int which) {
            data = new BeanRemark(1, viewHoder.title.getText().toString(), viewHoder.time.getText().toString(),
                    viewHoder.content.getText().toString());
            datas.set(id, data);
            adopter.notifyDataSetChanged();
        }
    }
    class exitClick implements DialogInterface.OnClickListener {
        @Override
        public void onClick(DialogInterface dialog, int which) {
            adopter.notifyDataSetChanged();
        }
    }

    class delClick implements DialogInterface.OnClickListener
    {
        int id;
        public delClick(int id)
        {
            this.id = id;
        }
        @Override
        public void onClick(DialogInterface dialog, int which) {
            datas.remove(id);
            adopter.notifyDataSetChanged();
        }
    }

    private class ViewHoder
    {
        EditText title,time,content;
    }
}

　　通过对话框实现长按编辑

package com.example.ex_2;

import android.content.Context;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.BaseAdapter;
import android.widget.ImageView;
import android.widget.ListView;
import android.widget.TextView;

import java.util.List;

public class phoneAdapter extends BaseAdapter {
    private Context context;
    private List<BeanPhone> datas;
    public phoneAdapter(Context context, List<BeanPhone> datas)
    {
        this.context = context;
        this.datas = datas;
    }
    //返回子项数量
    @Override
    public int getCount()
    {
        return datas.size();
    }
    //返回子项
    @Override
    public Object getItem(int postion)
    {
        return datas.get(postion);
    }
    //返回下标
    @Override
    public long getItemId(int postion)
    {
        return postion;
    }
    //返还视图
    @Override
    public View getView(int postion, View convertView, ViewGroup parent) //子项下标，当前视图，父项视图
    {
        BeanPhone item = (BeanPhone) getItem(postion);
        View view;
        ViewHoder viewHoder;
        if(convertView == null)
        {
            view = LayoutInflater.from(context).inflate(R.layout.list_tiem, null);
            viewHoder = new ViewHoder();
            viewHoder.img = (ImageView) view.findViewById(R.id.img);
            viewHoder.name = (TextView) view.findViewById(R.id.tv1);
            viewHoder.num = (TextView) view.findViewById(R.id.tv2);
            viewHoder.cname = (TextView) view.findViewById(R.id.tv3);
            view.setTag(viewHoder);
        }
        else
        {
            view = convertView;
            viewHoder = (ViewHoder) view.getTag();
        }
        viewHoder.name.setText(item.getName());
        viewHoder.img.setImageResource(item.getImgId());
        viewHoder.num.setText(item.getNum());
        viewHoder.cname.setText(item.getCname());
        return view;
    }

    class ViewHoder
    {
        ImageView img;
        TextView name,num,cname;
    }

}

适配器

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:orientation="vertical" android:layout_width="match_parent"
    android:layout_height="match_parent">
    <TextView
        android:layout_width="50dp"
        android:layout_height="20dp"
        android:textSize="15dp"
        android:text="title"
        />

    <EditText
        android:id="@+id/etx1"
        android:layout_width="200dp"
        android:layout_height="30dp"
        android:paddingTop="0dp"
        android:textSize="15dp"
        />

    <TextView
        android:layout_width="50dp"
        android:layout_height="20dp"
        android:textSize="15dp"
        android:text="notice time"
        />

    <EditText
        android:id="@+id/etx2"
        android:paddingTop="0dp"
        android:layout_width="200dp"
        android:layout_height="30dp"
        android:textSize="15dp"
        />

    <TextView
        android:layout_width="50dp"
        android:layout_height="20dp"
        android:textSize="15dp"
        android:text="content"
        />

    <EditText
        android:id="@+id/etx3"
        android:layout_width="200dp"
        android:layout_height="30dp"
        android:paddingTop="0dp"
        android:textSize="15dp" />

</LinearLayout>

对话框布局

 

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:orientation="vertical"
    android:layout_width="match_parent"
    android:layout_height="match_parent">

    <LinearLayout
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:width="0dp"
        android:orientation="horizontal"
        android:gravity="right">

        <TextView
            android:id="@+id/title"
            android:width="0dp"
            android:layout_weight="1.0"
            android:layout_width="fill_parent"
            android:layout_height="wrap_content"
            android:textSize="20sp"
            android:text="通讯录标题"/>


        <TextView android:id="@+id/noticeTime"
            android:textSize="10sp"
            android:width="0dp"
            android:layout_weight="3.0"
            android:layout_width="match_parent"
            android:layout_height="match_parent"
            android:text="time"/>

    </LinearLayout>

    <TextView
        android:id="@+id/content"
        android:layout_width="match_parent"
        android:layout_height="20dp"
        android:text="通讯录内容hhhhhhhhhhhhhhhhhhhh"/>


</LinearLayout>

子项