Android realizes drop down display of entry effect
- 2021-11-01 04:39:09
- OfStack
In this article, we share the specific code of Android drop-down display items for your reference. The specific contents are as follows
Layout file
<?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:id="@+id/activity_main"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:paddingBottom="@dimen/activity_vertical_margin"
android:paddingLeft="@dimen/activity_horizontal_margin"
android:paddingRight="@dimen/activity_horizontal_margin"
android:paddingTop="@dimen/activity_vertical_margin"
android:background="#000000"
tools:context="com.example.a2_.MainActivity">
<EditText
android:id="@+id/et_input"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:textColor="#fff"
android:text=" Please enter content " />
<ImageButton
android:padding="6dp"
android:background="@null"
android:layout_alignRight="@id/et_input"
android:id="@+id/ib"
android:src="@mipmap/down_arrow"
android:layout_width="wrap_content"
android:layout_height="wrap_content" />
</RelativeLayout>
Entry layout file
<?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="wrap_content"
android:padding="5dp"
android:descendantFocusability="blocksDescendants"
android:orientation="horizontal">
<ImageView
android:src="@mipmap/user"
android:id="@+id/iv_user"
android:layout_width="wrap_content"
android:layout_height="wrap_content" />
<TextView
android:layout_weight="1"
android:id="@+id/tv_data"
android:text="100"
android:textColor="#000000"
android:gravity="center_horizontal"
android:layout_width="0dp"
android:layout_height="wrap_content" />
<ImageButton
android:background="@null"
android:src="@mipmap/delete"
android:id="@+id/iv_delete"
android:layout_width="wrap_content"
android:layout_height="wrap_content" />
</LinearLayout>
Core code
package com.example.a2_;
import android.graphics.drawable.ColorDrawable;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.view.View;
import android.view.ViewGroup;
import android.widget.AdapterView;
import android.widget.BaseAdapter;
import android.widget.EditText;
import android.widget.ImageButton;
import android.widget.ImageView;
import android.widget.ListView;
import android.widget.PopupWindow;
import android.widget.TextView;
import java.util.ArrayList;
public class MainActivity extends AppCompatActivity {
private EditText et_input;
private PopupWindow popupWindow;
private ListView lv_list;
private ArrayList<String> data;
private MyAdapter myAdapter;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
// Initialize control
et_input = (EditText) findViewById(R.id.et_input);
ImageButton ib = (ImageButton) findViewById(R.id.ib);
// Initialize a data source
initData();
// Create 1 A listView
lv_list = new ListView(this);
// To listview Setting Background
lv_list.setBackgroundResource(R.mipmap.listview_background);
// To listview Setting adapter
myAdapter = new MyAdapter();
lv_list.setAdapter(myAdapter);
// To listview Set entry click events
lv_list.setOnItemClickListener(new AdapterView.OnItemClickListener() {
@Override
public void onItemClick(AdapterView<?> parent, View view, int position, long id) {
// When clicked to 1 When the number of entries is , The content of this entry is displayed in the input box
et_input.setText(data.get(position));
popupWindow.dismiss();
}
});
// Set click events for buttons
ib.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
// When the drop-down button is clicked , Show list options
showPopup();
}
});
}
// Initialization data
private void initData() {
// Create 1 Set of , Used to store data
data = new ArrayList<>();
// Pass for Loop to create data
for (int i = 1;i<20;i++){
data.add(100+i+"");
}
}
// Show drop-down list entries
private void showPopup() {
// Create PopupWindow Object
popupWindow = new PopupWindow(lv_list,et_input.getWidth(),500,true);
// In order to make list items hidden by clicking on areas other than list items, , Set for list entries 1 Background
popupWindow.setBackgroundDrawable(new ColorDrawable());
// Make list entries appear And specify under which list entry to display
popupWindow.showAsDropDown(et_input);
}
// Create 1 Adapters
class MyAdapter extends BaseAdapter{
@Override
public int getCount() {
return data.size();
}
@Override
public String getItem(int position) {
return data.get(position);
}
@Override
public long getItemId(int position) {
return position;
}
@Override
public View getView(final int position, View convertView, ViewGroup parent) {
// Judge convertView Whether it is empty or not
if (convertView==null){
convertView = View.inflate(MainActivity.this,R.layout.lv_item,null);
}
// Find the control
TextView tv_data = (TextView) convertView.findViewById(R.id.tv_data);
ImageView iv_delete = (ImageView) convertView.findViewById(R.id.iv_delete);
// Set click events
iv_delete.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
// Delete the data in the collection
data.remove(position);
// Refresh page
myAdapter.notifyDataSetChanged();
}
});
// Get data
String data = getItem(position);
// Setting data
tv_data.setText(data);
return convertView;
}
}
}