Android中的ListView的应用_app listview-优快云博客

本文链接：https://blog.youkuaiyun.com/gh6267/article/details/78022983

ListView 就是列表视图，就是在界面形成一张列表。
在activity_main.xml声明ListView组件，在strings.xml中放入列表每一项的主题，创建一个item_list.xml文件来存放列表的信息，详细看代码
activity_main.xml

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout 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"
    tools:context="com.example.hsy.listview_01.MainActivity"
    android:orientation="vertical">

    <TextView
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="大佬列表"
        android:layout_gravity="center_horizontal"
        android:textSize="20dp"/>
    <ListView
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:id="@+id/lv"
        android:entries="@array/person"
        android:divider="@color/colorPrimary"
        android:dividerHeight="2dp"
        android:headerDividersEnabled="true"></ListView>

</LinearLayout>

item_list.xml

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:orientation="horizontal" android:layout_width="match_parent"
    android:layout_height="match_parent">
    <ImageView
        android:layout_width="50dp"
        android:layout_height="50dp"
        android:id="@+id/ivHeader"/>
    <LinearLayout
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:orientation="vertical">
        <TextView
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:id="@+id/tvName"
            android:textSize="20dp"
            android:textColor="#f0f"
            android:layout_marginLeft="10dp"
            android:orientation="vertical"/>
        <TextView
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:id="@+id/tvDesc"
            android:textSize="20dp"
            android:textColor="#f0f"
            android:paddingLeft="10dp"
            android:orientation="vertical"/>
    </LinearLayout>

strings.xml

<resources>
    <string name="app_name">ListView_01</string>
    <string-array name="person">
        <item>tourist</item>
        <item>Petr</item>
        <item>W4yneb0t</item>
        <item>Um_nik</item>
        <item>-XraY-</item>
        <item>SpyCheese</item>
    </string-array>
</resources>

MainActivity.java

package com.example.hsy.listview_01;

import android.content.Intent;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.view.View;
import android.view.ViewGroup;
import android.widget.AdapterView;
import android.widget.BaseAdapter;
import android.widget.ImageView;
import android.widget.ListView;
import android.widget.TextView;
import android.widget.Toast;

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

public class MainActivity extends AppCompatActivity {

    ListView listView;

    List<Person> personList=new ArrayList<>();
    NewAdapter adapter;

    @Override
    protected void onCreate(Bundle savedInstanceState) {

        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);

        initData();
        initView();

        listView.setOnItemClickListener(new AdapterView.OnItemClickListener(){
            @Override
            public void onItemClick(AdapterView<?> parent, View view, int position, long id) {
                Toast.makeText(MainActivity.this,personList.get(position).getName()+" 被短按 ",Toast.LENGTH_SHORT).
                        show();
            }
        });
        listView.setOnItemLongClickListener(new AdapterView.OnItemLongClickListener() {
            @Override
            public boolean onItemLongClick(AdapterView<?> parent, View view, int position, long id) {
                Toast.makeText(MainActivity.this,personList.get(position).getName()+" 被长按 ",Toast.LENGTH_LONG).
                        show();
                return false;
            }
        });
        listView.setOnItemClickListener(new AdapterView.OnItemClickListener() {
            @Override
            public void onItemClick(AdapterView<?> parent, View view, int position, long id) {
                String lang="";
                if(personList.get(position).getName().equals("tourist")){
                    lang="C++";
                } else if(personList.get(position).getName().equals("Petr")){
                    lang="JAVA";
                } else if(personList.get(position).getName().equals("W4yneb0t")){
                    lang="C";
                } else if(personList.get(position).getName().equals("Um_nik")){
                    lang="PHP";
                } else if(personList.get(position).getName().equals("-XraY-")){
                    lang="JSP";
                } else if(personList.get(position).getName().equals("SpyCheese")){
                    lang="Python";
                }
                String result="I am "+personList.get(position).getName()+" , and I Love "+lang;
                Intent i = new Intent(MainActivity.this,Main2Activity.class);
                i.putExtra("data",result);
                startActivityForResult(i,0);
            }
        });
    }
    private void initView(){
        listView = (ListView) findViewById(R.id.lv);
        adapter = new NewAdapter();
        listView.setAdapter(adapter);



    }
    private void initData() {
        String [] names = getResources().getStringArray(R.array.person);
        int [] imageID = new int[]{R.drawable.d,R.drawable.e,R.drawable.g,R.drawable.h,
                R.drawable.i,R.drawable.j};
        String [] dsecs = new String[]
                {"I am tourist","I am Petr","I am W4yneb0t","I am Um_nik",
                        "I am -XraY-","I am SpyCheese"};

        Person person;

        for(int i=0;i<names.length;i++){
            person=new Person(imageID[i],names[i],dsecs[i]);
            personList.add(person);
        }

    }

    class NewAdapter extends BaseAdapter{

        @Override
        public int getCount() {
            return personList.size();
        }

        @Override
        public Person getItem(int position) {
            return personList.get(position);
        }

        @Override
        public long getItemId(int position) {
            return position;
        }

        @Override
        public View getView(int position, View convertView, ViewGroup parent) {
            View layout=View.inflate(MainActivity.this,R.layout.item_list,null);
            ImageView iv = (ImageView) layout.findViewById(R.id.ivHeader);
            TextView tvname=(TextView) layout.findViewById(R.id.tvName);
            TextView dsec=(TextView) layout.findViewById(R.id.tvDesc);
            iv.setImageResource(personList.get(position).getId());
            tvname.setText(personList.get(position).getName());
            dsec.setText(personList.get(position).getDesc());
            return layout;
        }
    }
}

activity_main2.xml

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout 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:orientation="vertical"
    tools:context="com.example.hsy.listview_01.Main2Activity">
    <TextView
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="显示结果"
        android:id="@+id/tvshow"/>
    <Button
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:layout_marginTop="30dp"
        android:text="返回"
        android:id="@+id/btnf"/>

</LinearLayout>

Main2Activity.java

package com.example.hsy.listview_01;

import android.content.Intent;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.view.View;
import android.widget.Button;
import android.widget.TextView;

import org.w3c.dom.Text;

public class Main2Activity extends AppCompatActivity {
    TextView tvshow;
    Button btnf;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main2);
        tvshow=(TextView) findViewById(R.id.tvshow);
        btnf=(Button)findViewById(R.id.btnf);
        Intent intent = getIntent();
        tvshow.setText(intent.getStringExtra("data").toString());
        btnf.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                Intent intent1=new Intent(Main2Activity.this,MainActivity.class);
                intent1.putExtra("result1",tvshow.getText().toString());
                setResult(1,intent1);
                finish();
            }
        });
    }
}

Person.java

package com.example.hsy.listview_01;

import java.io.Serializable;

/**
 * Created by SSVV on 2017/9/14.
 */

public class Person implements Serializable {
    private int id;
    private String name;
    private String desc;

    Person(int id,String name,String desc){
        this.desc=desc;
        this.name=name;
        this.id=id;
    }

    public String getName() {
        return name;
    }

    public int getId() {
        return id;
    }

    public String getDesc() {
        return desc;
    }

    public void setName(String name) {
        this.name = name;
    }

    public void setDesc(String desc) {
        this.desc = desc;
    }

    public void setId(int id) {
        this.id = id;
    }
}