build.gradle
dependencies {
compile fileTree(dir: 'libs', include: ['*.jar'])
testCompile 'junit:junit:4.12'
compile 'com.android.support:appcompat-v7:23.4.0'
compile 'com.jakewharton:butterknife:7.0.1'
}
主要利用Spinner与BaseAdapter来实现菜单下拉。具体美观效果要靠各个控件的调整，以及必要的分割线添加。
适配器的item代码：item_main.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"
android:orientation="vertical"
>
<TextView
android:id="@+id/item_main_tv"
android:layout_width="match_parent"
android:layout_height="40dp"
android:layout_marginLeft="16dp"
android:background="#fff"
android:gravity="center_vertical"
android:singleLine="true"
android:text="测试文字"
android:textSize="15dp"
/>
<!--分割线-->
<TextView
android:id="@+id/main_tv_line"
android:layout_width="match_parent"
android:layout_height="1dp"
android:layout_marginLeft="16dp"
android:layout_marginRight="16dp"
android:background="#edecec"/>
</LinearLayout>
主页面布局文件activity_main.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"
android:orientation="vertical"
>
<LinearLayout
android:layout_width="match_parent"
android:layout_height="40dp"
>
<Spinner
android:id="@+id/main_sp1"
style="@style/style_spinner">
</Spinner>
<!--这个是spinner之间的分割线-->
<ImageView
style="@style/style_mian_verline"/>
<Spinner
android:id="@+id/main_sp2"
style="@style/style_spinner"
></Spinner>
<ImageView
style="@style/style_mian_verline"/>
<Spinner
android:id="@+id/main_sp3"
style="@style/style_spinner"
></Spinner>
</LinearLayout>
<!--设置一条分割线-->
<TextView
android:layout_width="match_parent"
android:layout_height="1dp"
android:background="#dcdcdc"
/>
<LinearLayout
android:layout_width="match_parent"
android:layout_height="match_parent"
android:background="#ffffff">
<TextView
android:layout_width="match_parent"
android:layout_height="match_parent"
android:gravity="center"
android:text="我是分类下面的正文内容"/>
</LinearLayout>
</LinearLayout>
style文件
<!--spinner的样式-->
<style name="style_spinner">
<item name="android:layout_width">0dp</item>
<item name="android:layout_height">40dp</item>
<item name="android:layout_weight">1</item>
<item name="android:dropDownVerticalOffset">40dp</item>
<item name="android:dropDownWidth">1000dp</item>
</style>
<!--定义spinner之间的线的样式-->
<style name="style_mian_verline">
<item name="android:layout_width">1dp</item>
<item name="android:layout_height">25dp</item>
<item name="android:background">#dcdcdc</item>
<item name="android:layout_gravity">center_vertical</item>
</style>
MainActivity与适配器写在了一起，便于操作
public class MainActivity extends AppCompatActivity {
@Bind(R.id.main_sp1)
Spinner mMainSp1;
@Bind(R.id.main_sp2)
Spinner mMainSp2;
@Bind(R.id.main_sp3)
Spinner mMainSp3;
private List<String> data_list1;
private List<String> data_list2;
private List<String> data_list3;
private BaseAdapter arr_adapter;//适配器
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
ButterKnife.bind(this);
initData();
initAdapter();
setListener();
}
//设置监听事件，将来商家列表的排序都在这里面处理
private void setListener() {
mMainSp1.setOnItemSelectedListener(new AdapterView.OnItemSelectedListener() {
@Override
public void onItemSelected(AdapterView<?> parent, View view, int position, long id) {
Toast.makeText(MainActivity.this, "点击了"+data_list1.get(position), Toast.LENGTH_SHORT).show();
}
@Override
public void onNothingSelected(AdapterView<?> parent) {
}
});
mMainSp2.setOnItemSelectedListener(new AdapterView.OnItemSelectedListener() {
@Override
public void onItemSelected(AdapterView<?> parent, View view, int position, long id) {
Toast.makeText(MainActivity.this, "点击了"+data_list2.get(position), Toast.LENGTH_SHORT).show();
}
@Override
public void onNothingSelected(AdapterView<?> parent) {
}
});
mMainSp3.setOnItemSelectedListener(new AdapterView.OnItemSelectedListener() {
@Override
public void onItemSelected(AdapterView<?> parent, View view, int position, long id) {
Toast.makeText(MainActivity.this, "点击了"+data_list3.get(position), Toast.LENGTH_SHORT).show();
}
@Override
public void onNothingSelected(AdapterView<?> parent) {
}
});
}
private void initAdapter() {
//适配器
arr_adapter = new MyAdapter(data_list1);
mMainSp1.setAdapter(arr_adapter);
//适配器
arr_adapter = new MyAdapter(data_list2);
mMainSp2.setAdapter(arr_adapter);
//适配器
arr_adapter = new MyAdapter(data_list3);
mMainSp3.setAdapter(arr_adapter);
}
//设置数据来源，这个要在网络获取。由于数据不会太多，不再考虑性能优化问题
private void initData() {
//数据
data_list1 = new ArrayList<>();
data_list1.add("全部分类");
data_list1.add("零食");
data_list1.add("水果");
data_list1.add("洗衣");
data_list1.add("洗车");
data_list1.add("茶饮");
//数据
data_list2 = new ArrayList<>();
data_list2.add("商圈");
data_list2.add("郑州航院");
data_list2.add("华北水利水电大学");
data_list2.add("河南中医大学");
data_list2.add("河南财经大学");
//数据
data_list3 = new ArrayList<>();
data_list3.add("智能排序");
data_list3.add("好评优先");
data_list3.add("离我最近");
data_list3.add("价格最低");
}
//适配器
class MyAdapter extends BaseAdapter {
private LayoutInflater mLayoutInflater;
private List<String> mDataList;
MyAdapter(List<String> dataList) {
this.mDataList = dataList;
mLayoutInflater = LayoutInflater.from(MainActivity.this);
}
@Override
public int getCount() {
return mDataList.size();
}
@Override
public Object getItem(int position) {
return mDataList.get(position);
}
@Override
public long getItemId(int position) {
return position;
}
//数据不太多，没有使用ViewHolder进行处理。
@Override
public View getView(int position, View convertView, ViewGroup parent) {
convertView = View.inflate(MainActivity.this, R.layout.item_main, null);
TextView textView = (TextView) convertView.findViewById(R.id.item_main_tv);
textView.setText(mDataList.get(position));
return convertView;
}
}
}
http://download.csdn.net/detail/wgyscsf/9522533
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