Question

所以我试着按照教程here但不是像使用数组那样存储数据：

Weather weather_data[] = new Weather[]
    {
        new Weather(R.drawable.weather_cloudy, "Cloudy"),
        new Weather(R.drawable.weather_showers, "Showers"),
        new Weather(R.drawable.weather_snow, "Snow"),
        new Weather(R.drawable.weather_storm, "Storm"),
        new Weather(R.drawable.weather_sunny, "Sunny")
    };

我想使用像

这样的arraylist

ArrayList<Weather> weather_data = new ArrayList<Weather>();

然后将内容存储为

weather_data.add(new new Weather(R.drawable.weather_cloudy, "Cloudy"));

但我将如何改变

public class WeatherAdapter extends ArrayAdapter<Weather>{

Context context;
int layoutResourceId;   
Weather data[] = null;

public WeatherAdapter(Context context, int layoutResourceId, Weather[] data) {
    super(context, layoutResourceId, data);
    this.layoutResourceId = layoutResourceId;
    this.context = context;
    this.data = data;
}

@Override
public View getView(int position, View convertView, ViewGroup parent) {
    View row = convertView;
    WeatherHolder holder = null;

    if(row == null)
    {
        LayoutInflater inflater = ((Activity)context).getLayoutInflater();
        row = inflater.inflate(layoutResourceId, parent, false);

        holder = new WeatherHolder();
        holder.imgIcon = (ImageView)row.findViewById(R.id.imgIcon);
        holder.txtTitle = (TextView)row.findViewById(R.id.txtTitle);

        row.setTag(holder);
    }
    else
    {
        holder = (WeatherHolder)row.getTag();
    }

    Weather weather = data[position];
    holder.txtTitle.setText(weather.title);
    holder.imgIcon.setImageResource(weather.icon);

    return row;
}

static class WeatherHolder
{
    ImageView imgIcon;
    TextView txtTitle;
}
}

使用arraylist而不仅仅是数组。

提前谢谢你，

泰勒

EDIT1：我试过改变

ArrayList<AllList> data = null;
public WeatherAdapter(Context context, int layoutResourceId, ArrayList<Weather> data) {
super(context, layoutResourceId, data);
this.layoutResourceId = layoutResourceId;
this.context = context;
this.data = data;
}

和

Weather weather = data.get(position);

然后当我尝试在logcat中查看它时如此：

Log.d（ “weather_data”，weather_data.toString（））;

显示

02-13 21:06:50.542: D/allList_data(6410): [com.skateconnect.AllList@4220ecc0]

Answer 1

对于初学者，在构造函数中只需更改它以使用

中的ArrayList

public WeatherAdapter(Context context, int layoutResourceId, Weather[] data)

到

public WeatherAdapter(Context context, int layoutResourceId, ArrayList<Weather> data)

然后显然你会实例化你的列表来改变

 Weather data[] = null;

到

ArrayList<Weather> data = null;

Answer 2

它将采用相同的方式，但您不会创建数组，而是创建ArratList<Weather>

看看这个

public class WeatherAdapter extends ArrayAdapter<Weather>{

Context context;
int layoutResourceId;   
//Weather data[] = null;
ArrayList<Weather> data = null ;

public WeatherAdapter(Context context, int layoutResourceId, ArrayList<Weather> data) {
super(context, layoutResourceId, data);
this.layoutResourceId = layoutResourceId;
this.context = context;
this.data = data;
}

@Override
public View getView(int position, View convertView, ViewGroup parent) {
View row = convertView;
WeatherHolder holder = null;

if(row == null)
{
    LayoutInflater inflater = ((Activity)context).getLayoutInflater();
    row = inflater.inflate(layoutResourceId, parent, false);

    holder = new WeatherHolder();
    holder.imgIcon = (ImageView)row.findViewById(R.id.imgIcon);
    holder.txtTitle = (TextView)row.findViewById(R.id.txtTitle);

    row.setTag(holder);
}
else
{
    holder = (WeatherHolder)row.getTag();
}

Weather weather = data.get(position);
holder.txtTitle.setText(weather.title);
holder.imgIcon.setImageResource(weather.icon);

return row;
}

您将发送构造函数ArrayList<Weather>

在任何问题上反馈我

Answer 3

这是对arraylist的改变，这段代码是工作

ArrayList<Weather> weather_data = new ArrayList<Weather>();  

weather_data.add(new Weather(R.drawable.weather_cloudy, "Cloudy"));
weather_data.add(new Weather(R.drawable.weather_showers, "Showers"));
weather_data.add(new Weather(R.drawable.weather_snow, "Snow"));
weather_data.add(new Weather(R.drawable.weather_storm, "Storm"));
weather_data.add(new Weather(R.drawable.weather_sunny, "Sunny"));

public class WeatherAdapter extends ArrayAdapter<Weather>{

Context context;
int layoutResourceId;   
ArrayList<Weather> data = null;

public WeatherAdapter(Context context, int layoutResourceId, ArrayList<Weather data) {
    super(context, layoutResourceId, data);
    this.layoutResourceId = layoutResourceId;
    this.context = context;
    this.data = data;
}

@Override
public View getView(int position, View convertView, ViewGroup parent) {
    View row = convertView;
    WeatherHolder holder = null;

    if(row == null)
    {
        LayoutInflater inflater = ((Activity)context).getLayoutInflater();
        row = inflater.inflate(layoutResourceId, parent, false);

        holder = new WeatherHolder();
        holder.imgIcon = (ImageView)row.findViewById(R.id.imgIcon);
        holder.txtTitle = (TextView)row.findViewById(R.id.txtTitle);

        row.setTag(holder);
    }
    else
    {
        holder = (WeatherHolder)row.getTag();
    }

    Weather weather = data.get(position);
    holder.txtTitle.setText(weather.title);
    holder.imgIcon.setImageResource(weather.icon);

    return row;
}

static class WeatherHolder
{
    ImageView imgIcon;
    TextView txtTitle;
}
}

带有Custom ArrayAdapter的ArrayList

3 个答案: