android - 相对布局中的 ArrayAdapter - Android

Question

我正在尝试通过实现 developer.android.com 上给出的示例重新熟悉 Android .

我正在尝试 this example在相对布局上。虽然布局对我来说很清楚，但我无法向此处提供的微调器添加功能。这是我正在尝试做的事情:
让用户可以选择 future 7 天中的任何一天来设置闹钟。为此，我想用每次启动应用程序时动态设置的 ArrayAdapter 填充微调器。 ArrayAdapter 的内容将是当前日期和接下来的 7 天。我无法初始化 ArrayAdapter。
鉴于内容是动态的，ArrayAdapter 是最好的数据结构吗？

代码:

activity_main.xml:

<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="fill_parent"
    android:layout_height="fill_parent" >

    <EditText android:id="@+id/reminderName"
        android:hint="@string/reminderNameString"
        android:layout_height="wrap_content"
        android:layout_width="fill_parent"
        />

    <Spinner android:id="@+id/dateSelect"
        android:layout_below="@id/reminderName"
        android:layout_width="0dp"
        android:layout_height="wrap_content"
        android:layout_alignParentLeft="true"
        android:layout_toLeftOf="@+id/timeSelect"
        android:hint="@string/selectDate"
        />

    <Spinner android:id="@id/timeSelect"
        android:hint="@string/selectTimeString"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_alignParentRight="true"
        android:layout_below="@id/reminderName"
        />

    <Button android:id="@+id/setButton"
        android:hint="@string/setString"
        android:layout_below="@id/timeSelect"
        android:layout_alignRight="@id/reminderName"
        android:layout_height="wrap_content"
        android:layout_width="wrap_content"
        android:onClick="onSet"
        />

    <TextView android:id="@+id/text"
        />

</RelativeLayout>

主要功能:

package com.example.relativelayout;

import java.util.ArrayList;
import java.util.Date;

import android.app.Activity;
import android.os.Bundle;
import android.util.Log;
import android.view.Menu;
import android.view.View;
import android.widget.ArrayAdapter;
import android.widget.Spinner;

public class MainActivity extends Activity {

    Spinner dates;
    Spinner times;

    @Override
    public void onCreate(Bundle savedInstanceState) {
        /* This function must move like so:
         * 1. Generate the dates.
         * 2. Add them to an arrayList
         * 3. Set the data via an adapter into the spinner.
         * 4. Set the layout.
         */

        super.onCreate(savedInstanceState);

        Log.v(this.toString(), "Loaded the layout");

        //init ArrayList object to store all the dates.
        ArrayList<String> dates_list = new ArrayList<String>(8);  //there are always only 7 days.

        Date d = new Date();  //initialize the date to current date and time.
        dates_list.add(d.toString());
        //GregorianCalendar g = new GregorianCalendar();
        Log.v(this.toString(), "Current date = " + d.toString());

        for(int i = 0; i < 7; i++) {
            if( (d.getMonth() % 2 != 0) || (d.getMonth() == 8) ) {
                //the month has 31 days.
                int dateAdj = d.getDate();
                if( (dateAdj + i) > 31 ) {
                    dateAdj = (dateAdj + i) - 31;
                    d.setDate(dateAdj);
                    d.setMonth(d.getMonth() + 1);
                } else {
                    d.setDate((dateAdj + 1));
                }
            } else {  //the month has only 30 days
                int dateAdj = d.getDate();
                if( (dateAdj + i) > 30 ) {
                    dateAdj = (dateAdj + i) - 30;
                    d.setDate(dateAdj);
                    d.setMonth(d.getMonth() + 1);
                } else {
                    d.setDate((dateAdj + 1));
                }
            }           
            dates_list.add(d.toString());  //add it to the list.
            //Log.v(this.toString(), "The date today = " + d.toString());
        }

        Log.v(this.toString(), "Printing details of the arrayList");

        /*for(int i = 0; i < 8; i++) {
            Log.v(this.toString(), "Date in position " + i + " " + dates_list.get(i));
        }*/

        //have all the dates in the prescribed format. add it to the spinners.
        ArrayAdapter<String> array_adapter_dates = new ArrayAdapter<String>(this, android.R.layout.simple_list_item_1, dates_list);

        Log.v(this.toString(), "Adding dates to array adapters.");

        //init the spinner from the layouts.
        dates = (Spinner) findViewById(R.id.dateSelect);  //got the spinner
        array_adapter_dates.setDropDownViewResource(android.R.layout.simple_spinner_dropdown_item);

        Log.v(this.toString(), "Spinners initialized. Moving to apply adapters to the spinner.");

        //apply adapter to the spinner.
        dates.setAdapter(array_adapter_dates);

        Log.v(this.toString(), "Applied adapter to the spinner.");

        //set the layout
        setContentView(R.layout.activity_main);
    }

    @Override
    public boolean onCreateOptionsMenu(Menu menu) {
        getMenuInflater().inflate(R.menu.activity_main, menu);
        return true;
    }

    public void onSet(View view) {
        /*This is the function called when the Set button is pressed.
         *  1. Take the details of the spinners.
         *  2. Flash them.
         *  3. Set an alarm with it.
         */

        Log.v(this.toString(), "onSet() function inboked.");        
    }


}

Answer 1

您必须创建一个 Arraylist，然后将 date.tostring 添加到此 arraylist，而不是将 Date 对象添加到适配器。

使用这个 ArrayList 创建一个 ArrayAdapter

array_adapter_dates = new ArrayAdapter<String>(this,android.R.layout.simple_list_item_1, Arraylist<String>)