Android中使用Spinner实现下拉列表

编写不易，如有转载，请声明出处: 梦回河口：http://blog.csdn.net/zxc514257857/article/details/70478537

Demo展示图片

布局代码

//(layout)activity_main
<LinearLayout
 xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
android:id="@+id/activity_main"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:orientation="vertical"
tools:context="com.test.spinner.MainActivity">

<LinearLayout
 android:layout_width="match_parent"
android:layout_height="wrap_content"
android:orientation="horizontal">
<TextView
 android:textSize="20sp"
android:layout_margin="10dp"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="今年的常规赛MVP："/>

<TextView
 android:id="@+id/text"
android:textSize="20sp"
android:layout_marginTop="10dp"
android:layout_width="wrap_content"
android:layout_height="wrap_content"/>
</LinearLayout>

<Spinner
 android:visibility="gone"
android:id="@+id/spinner"
android:layout_marginLeft="10dp"
android:layout_width="wrap_content"
android:layout_height="wrap_content">
</Spinner>
</LinearLayout>
-------------------------------------------------------------------
//(layout)item
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:orientation="horizontal"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:gravity="center_vertical">

<ImageView
 android:id="@+id/imageView"
android:layout_width="80dp"
android:layout_height="80dp"/>


<TextView
 android:id="@+id/textView"
android:layout_marginLeft="20dp"
android:layout_width="wrap_content"
android:layout_height="wrap_content"/>

</LinearLayout>

Activity代码

//MainActivity
import android.content.Context;
import android.os.Bundle;
import android.support.v7.app.AppCompatActivity;
import android.view.Menu;
import android.view.MenuItem;
import android.view.View;
import android.widget.AdapterView;
import android.widget.ArrayAdapter;
import android.widget.SimpleAdapter;
import android.widget.Spinner;
import android.widget.TextView;
import java.util.ArrayList;
import java.util.HashMap;
import java.util.List;
import java.util.Map;

public class MainActivity extends AppCompatActivity {

private Context mContext = MainActivity.this;
private Spinner mSpinner;
private ArrayAdapter<String> mArrayAdapter;
private TextView mTextView;
private SimpleAdapter mSimpleAdapter;

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

private void initView(){
        mSpinner = (Spinner) findViewById(R.id.spinner);
        mTextView = (TextView) findViewById(R.id.text);
    }

private void initData(){
// 设置数据集
        List<String> list = new ArrayList<>();
        list.add("哈登");
        list.add("莱昂纳德");
        list.add("詹姆斯");
        list.add("威斯布鲁克");

        List<Map<String ,Object>> maps = new ArrayList<>();
int[] icon = {R.mipmap.pic1 , R.mipmap.pic2, R.mipmap.pic3, R.mipmap.pic4};
        String[] iconName = {"哈登" , "莱昂纳德" , "詹姆斯" , "威斯布鲁克"};

// 设置适配器
        mArrayAdapter = new ArrayAdapter<>(mContext ,
                android.R.layout.simple_spinner_item , list);
        mArrayAdapter.setDropDownViewResource(android.R.layout.simple_spinner_dropdown_item);

        mSimpleAdapter = new SimpleAdapter(mContext,
                maps , R.layout.item , new String[]{"image" , "text"} , new int[]{R.id.imageView ,R.id.textView});

for(int i = 0 ; i < icon.length ; i++){
            Map<String ,Object> map = new HashMap<>();
            map.put("image", icon[i]);
            map.put("text" , iconName[i]);
            maps.add(map);
        }
    }

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

@Override
public boolean onOptionsItemSelected(MenuItem item) {
switch (item.getItemId()){
case R.id.arrayAdapter:
                mSpinner.setVisibility(View.VISIBLE);
                mSpinner.setAdapter(mArrayAdapter);
// 设置监听器
                mSpinner.setOnItemSelectedListener(new AdapterView.OnItemSelectedListener() {
@Override
public void onItemSelected(AdapterView<?> adapterView, View view, int position, long id) {
                        mTextView.setText(mArrayAdapter.getItem(position));
                    }
@Override
public void onNothingSelected(AdapterView<?> adapterView) {

                    }
                });

break;

case R.id.simpleAdapter:
                mSpinner.setVisibility(View.VISIBLE);
                mSpinner.setAdapter(mSimpleAdapter);
// 设置监听器
                mSpinner.setOnItemSelectedListener(new AdapterView.OnItemSelectedListener() {
@Override
public void onItemSelected(AdapterView<?> adapterView, View view, int position, long id) {
                        mTextView.setText(mSimpleAdapter.getItem(position)+"");
                    }

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

                    }
                });

break;

default:
break;
        }
return super.onOptionsItemSelected(item);
    }
}

Demo下载请移步：http://download.csdn.net/detail/zxc514257857/9825484


———-因本人才疏学浅，如博客或Demo中有错误的地方请大家随意指出，与大家一起讨论，共同进步，谢谢！———-