Android之ListView

在MainActivity声明一个动态数组，把数据存在数组，然后通过Intent把整个数组传递到ListActivity。
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=".MainActivity">
    <Button
        android:id="@+id/btn_res"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="收到数据"/>
    <Button
        android:id="@+id/btn_find"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="查看记录"/>
</LinearLayout>

activity.xml:

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

    <ListView
        android:id="@+id/lv_data"
        android:layout_width="match_parent"
        android:layout_height="match_parent">
    </ListView>
</LinearLayout>

MainActivity.java:

package com.example.listviewtest02;

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

import java.util.ArrayList;
import java.util.Calendar;
import java.util.TimeZone;

public class MainActivity extends AppCompatActivity implements View.OnClickListener {
    private Button btn_res;
    private Button btn_find;
    Calendar cal;
    String year;
    String month;
    String day;
    String hour;
    String minute;
    String time;
    ArrayList<String> strArr = new ArrayList<String>();
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        btn_res=findViewById(R.id.btn_res);
        btn_find=findViewById(R.id.btn_find);
        btn_res.setOnClickListener(this);
        btn_find.setOnClickListener(this);
    }

    public void GetTime(){
        cal = Calendar.getInstance();
        cal.setTimeZone(TimeZone.getTimeZone("GMT+8:00"));
        year = String.valueOf(cal.get(Calendar.YEAR));
        month = String.valueOf(cal.get(Calendar.MONTH)+1);
        day = String.valueOf(cal.get(Calendar.DATE));
        if (cal.get(Calendar.AM_PM) == 0)
            hour = String.valueOf(cal.get(Calendar.HOUR));
        else
            hour = String.valueOf(cal.get(Calendar.HOUR)+12);
        minute = String.valueOf(cal.get(Calendar.MINUTE));
        time="时间："+year+"年"+month+"月"+day+"日"+hour+"时"+minute+"分";
    }
    @Override
    public void onClick(View v) {
        GetTime();
        if(v.getId()==R.id.btn_res){
            strArr.add("时间："+time+"  状态：正常");
        }
        if(v.getId()==R.id.btn_find){
            // 创建一个新意图
            Intent intent = new Intent();
            // 设置意图要跳转的活动类
            intent.setClass(this, ListActivity.class);
            intent.putExtra("liebiao",strArr);
            // 期望接收下个页面的返回数据
            startActivityForResult(intent, 0);
        }
    }
}

ListView:

package com.example.listviewtest02;

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

import java.util.ArrayList;

public class ListActivity extends AppCompatActivity {
    private ListView lv_data;
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_list);
        lv_data=findViewById(R.id.lv_data);
        Intent intent = super.getIntent();
        ArrayList<String> strArr = new ArrayList<String>();
        strArr = intent.getStringArrayListExtra("liebiao");
        ArrayAdapter<String> adapter = new ArrayAdapter<String>(
                ListActivity.this, android.R.layout.simple_list_item_1, strArr);
        lv_data.setAdapter(adapter);
    }
}

效果:

image.png

点击若干次"收到数据"，模拟服务器发送数据过来。

image.png