Android

//MainActivity.java
package com.example.zc.listviewdemo;

import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.widget.ArrayAdapter;
import android.widget.ListView;

public class MainActivity extends AppCompatActivity {

    private ListView listView;
    private String[] adapterData;



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

        listView = (ListView) findViewById(R.id.main);

        /* 我们要在listView上面没条显示的数据，放到一个数组中 */
        adapterData = new String[] {
                "Afghanistan",
                "Albania",
                "Algeria",
                "American Samoa",
                "Andorra",
                "Angola",
                "Anguilla",
                "Antarctica",
                "Antigua and Barbuda",
                "Argentina", "Armenia",
                "Aruba",
                "Australia", "Austria",
                "Azerbaijan", "Bahrain",
                "Bangladesh", "Barbados",
                "Belarus", "Belgium", "Belize",
                "Benin", "Bermuda", "Bhutan", "Bolivia",
                "Bosnia and Herzegovina", "Botswana",
                "Bouvet Island" };


         /* 这个是数组string类型的数组 */
        // ArrayAdapter<String> arrayAdapter = new ArrayAdapter<String>(
        // ArrayListDemo.this, android.R.layout.simple_list_item_1,
        // adapterData);


    /* 设置ListView的Adapter */
        listView.setAdapter(new ArrayAdapter<String>(MainActivity.this,
                android.R.layout.simple_list_item_1, adapterData));

    //@param1 listview上一个Activity
    //@param2 系统自带的xml，简单的一行
 //@param3 写入的数据






    }
}

//activity_main.xml
<?xml version="1.0" encoding="utf-8"?>
<android.support.constraint.ConstraintLayout
    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.zc.listviewdemo.MainActivity">

    <ListView
        android:id="@+id/main"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content">

    </ListView>

</android.support.constraint.ConstraintLayout>

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