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Android下拉选择框之PopupWindow
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1.效果图
2.思路分析
1.点击弹出对话框 popupwindow
2.对popupwindow进行相关设置，popupwindow中设置view为listview
3.listview中item设置点击事件
4.显示popupwindow
3.代码
1.布局文件
1.activity_main.xml
<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:app="http://schemas.android.com/apk/res-auto"
android:layout_width="match_parent"
android:layout_height="match_parent"> <RelativeLayout
android:layout_width="300dp"
android:layout_height="wrap_content"
android:layout_marginTop="20dp"
android:layout_marginLeft="20dp"
>
<EditText
android:layout_width="300dp"
android:layout_height="wrap_content"
android:id="@+id/tv" />
<ImageButton
android:id="@+id/imgshowdown"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:src="@drawable/down_arrow"
android:padding="4dp"
android:layout_alignTop="@+id/tv"
android:background="@null"
android:layout_alignParentRight="true"
/> </RelativeLayout> </RelativeLayout>
2.item_num_list
<?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:gravity="center_vertical"
android:padding="3dp"
>
<ImageView
android:layout_width="20dp"
android:layout_height="20dp"
android:src="@drawable/ic_default_person"
android:layout_marginRight="10dp"
/>
<TextView
android:layout_width="0dp"
android:layout_height="wrap_content"
android:id="@+id/tv"
android:layout_weight="1"
/>
<ImageView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:id="@+id/img"
android:src="@drawable/delete"
android:padding="5dp"
/> </LinearLayout>
2.MainActivity
public class MainActivity extends AppCompatActivity implements View.OnClickListener, AdapterView.OnItemClickListener {
@BindView(R.id.tv)
EditText tv;
@BindView(R.id.imgshowdown)
ImageButton imgshowdown;
private ListView listView;
private List<String> datas;
private MyAdapter adapter;
private PopupWindow popupWindow;
// private TextView tv;
// private
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
ButterKnife.bind(this);
imgshowdown.setOnClickListener(this);
}
@Override
public void onClick(View v) {
initListView();//初始化listview
showpopup();//初始化popupwindow 并显示出来
}
private void showpopup() {
if(popupWindow==null){
popupWindow=new PopupWindow(listView, tv.getWidth(), 300);
popupWindow.setOutsideTouchable(true);//点击外部消失
//设置背景 不然 setOutsideTouchable(true) 不起作用
popupWindow.setBackgroundDrawable(new BitmapDrawable());
popupWindow.setFocusable(true); //设置可获取焦点
}
popupWindow.showAsDropDown(tv,0,0);//显示位置
}
private void initListView() {
if(datas==null){
datas=new ArrayList<>();
for (int i = 0; i <30 ; i++) {
datas.add("person"+i);
}
}
if (listView == null) {
listView = new ListView(this);
listView.setDividerHeight(0);
listView.setBackgroundResource(R.drawable.listview_background);
listView.setOnItemClickListener(this);
adapter=new MyAdapter();
listView.setAdapter(adapter);
}
}
@Override
public void onItemClick(AdapterView<?> parent, View view, int position, long id) {
tv.setText(datas.get(position));
popupWindow.dismiss();
}
//listview 适配器
class MyAdapter extends BaseAdapter {
@Override
public int getCount() {
return datas.size();
}
@Override
public Object getItem(int position) {
return datas.get(position);
}
@Override
public long getItemId(int position) {
return position;
}
@Override
public View getView(final int position, View convertView, ViewGroup parent) {
ViewHolder holder;
if (convertView == null) {
convertView = View.inflate(parent.getContext(), R.layout.item_num_list, null);
holder=new ViewHolder(convertView);
// holder.tv.setText();
convertView.setTag(holder);
}else{
holder= (ViewHolder) convertView.getTag();
}
holder.tv.setText(datas.get(position));
holder.img.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
datas.remove(position);
notifyDataSetChanged();
if(datas.size()==0){
popupWindow.dismiss();
}
}
});
return convertView;
}
}
static class ViewHolder {
@BindView(R.id.tv)
TextView tv;
@BindView(R.id.img)
ImageView img;
ViewHolder(View view) {
ButterKnife.bind(this, view);
}
}
}
