spinner自定义adapter

 

WeatherAdapter
package example.com.spinner;

import android.content.Context;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.BaseAdapter;
import android.widget.ImageView;
import android.widget.TextView;

import java.util.List;

public class WeatherAdapter extends BaseAdapter {
    private List<Weather> mList;
    private Context mContext;

    public WeatherAdapter(List<Weather> mList, Context mContext) {
        this.mList = mList;
        this.mContext = mContext;
    }

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

    @Override
    public Object getItem(int position) {
        return mList.get(position);
    }

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

    @Override
    public View getView(int i, View view, ViewGroup viewGroup) {
        LayoutInflater inflater = LayoutInflater.from(mContext);
        view = inflater.inflate(R.layout.item_weather, viewGroup, false);
        if (view != null) {
            ImageView iv_weather = (ImageView) view.findViewById(R.id.iv_weather);
            TextView tv_weather = (TextView) view.findViewById(R.id.tv_weather);
            iv_weather.setImageResource(mList.get(i).getWeatherIcon());
            tv_weather.setText(mList.get(i).getWeatherName());
        }
        return view;
    }
}

item_weather.xml
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:padding="2dp"
    android:orientation="horizontal">

    <ImageView
        android:id="@+id/iv_weather"
        android:layout_width="30dp"
        android:layout_height="20dp"
        android:src="@drawable/ic_weather_cloud" />

    <TextView
        android:id="@+id/tv_weather"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="多云"
        android:textSize="10dp" />
</LinearLayout>

activity_main.xml<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:gravity="center_horizontal"
    tools:context="example.com.spinner.MainActivity">


    <Spinner
        android:id="@+id/spinner1"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:background="@null"
        android:gravity="center"
        />


</RelativeLayout>

package example.com.spinner;

import android.os.Bundle;
import android.support.v7.app.AppCompatActivity;
import android.view.View;
import android.widget.AdapterView;
import android.widget.Spinner;
import android.widget.Toast;

import java.util.ArrayList;

public class MainActivity extends AppCompatActivity {

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

        Spinner spinner = (Spinner) findViewById(R.id.spinner1);
        //建立数据源
        ArrayList<Weather> weathers = new ArrayList<>();
        weathers.add(new Weather("多云", R.drawable.ic_weather_cloud));
        weathers.add(new Weather("晴天", R.drawable.ic_weather_sunny));
        weathers.add(new Weather("雨天", R.drawable.ic_weather_rainy));
        weathers.add(new Weather("雾气", R.drawable.ic_weather_foggy));
        weathers.add(new Weather("下雪", R.drawable.ic_weather_snowy));
        weathers.add(new Weather("刮风", R.drawable.ic_weather_windy));
        //建立adapter绑定数据源
        WeatherAdapter adapter = new WeatherAdapter(weathers, this);
        spinner.setAdapter(adapter);
        spinner.setOnItemSelectedListener(new AdapterView.OnItemSelectedListener() {
            @Override
            public void onItemSelected(AdapterView<?> adapterView, View view, int pos, long l) {
                Toast.makeText(MainActivity.this, "你点击的是:" + pos, 0).show();
            }

            @Override
            public void onNothingSelected(AdapterView<?> adapterView) {

            }
        });
    }
}

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