listView優化_AlertDialog彈窗修改條目
阿新 • • 發佈：2018-11-24
- 一.tml程式碼
<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" tools:context="${relativePackage}.${activityClass}" > <ListView android:layout_width="match_parent" android:layout_height="match_parent" android:id="@+id/lv"> </ListView> </RelativeLayout>
二.條目程式碼
<?xml version="1.0" encoding="utf-8"?> <RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android" android:layout_width="match_parent" android:layout_height="80dp"> <ImageView android:id="@+id/img" android:layout_width="75dp" android:layout_height="75dp" android:src="@drawable/ic_launcher"/> <LinearLayout android:layout_width="wrap_content" android:layout_height="wrap_content" android:layout_centerInParent="true" android:orientation="vertical"> <TextView android:layout_width="wrap_content" android:layout_height="wrap_content" android:textSize="20sp" android:textColor="#000" android:id="@+id/text_name" android:text="灰太狼"/> <LinearLayout android:layout_width="wrap_content" android:layout_height="wrap_content" android:orientation="horizontal"> <TextView android:layout_width="wrap_content" android:layout_height="wrap_content" android:textColor="#000" android:textSize="18sp" android:text="價格:"/> <TextView android:layout_width="wrap_content" android:layout_height="wrap_content" android:id="@+id/text_price" android:textColor="#000" android:text="2200元"/> </LinearLayout> </LinearLayout> </RelativeLayout>
三.彈窗輸入框.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="wrap_content" android:orientation="vertical" > <EditText android:layout_width="match_parent" android:layout_height="wrap_content" android:id="@+id/ed_upd" android:hint="請輸入修改的價格"/> </LinearLayout>
四.java程式碼
package com.example.list_upd;
public class Person {
private String name;
private int price;
public Person() {
// TODO Auto-generated constructor stub
}
public String getName() {
return name;
}
public void setName(String name) {
this.name = name;
}
public int getPrice() {
return price;
}
public void setPrice(int price) {
this.price = price;
}
public Person(String name, int price) {
super();
this.name = name;
this.price = price;
}
}
package com.example.list_upd;
import java.util.ArrayList;
import java.util.List;
import android.app.Activity;
import android.app.AlertDialog;
import android.content.DialogInterface;
import android.content.DialogInterface.OnClickListener;
import android.os.Bundle;
import android.view.Menu;
import android.view.MenuItem;
import android.view.View;
import android.view.ViewGroup;
import android.widget.AdapterView;
import android.widget.AdapterView.OnItemClickListener;
import android.widget.BaseAdapter;
import android.widget.EditText;
import android.widget.ListView;
import android.widget.TextView;
public class MainActivity extends Activity {
private List<Person> list;
private ListView lv;
private MainActivity.Madapter madapter;
private EditText ed_upd;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
//獲取控制元件
lv=(ListView) findViewById(R.id.lv);
//初始化資料
initData();
//自定義介面卡
madapter=new Madapter();
//設定介面卡
lv.setAdapter(madapter);
//條目點選事件,修改條目中的內容
lv.setOnItemClickListener(new OnItemClickListener() {
@Override
public void onItemClick(AdapterView<?> parent, View view,
final int position, long id) {
//獲取AlertDialog中輸入框的檢視
View inflate = View.inflate(MainActivity.this,R.layout.ed_view, null);
//獲取AlertDialog中輸入框的控制元件
ed_upd = (EditText) inflate.findViewById(R.id.ed_upd);
AlertDialog alertDialog=new AlertDialog.Builder(MainActivity.this)
//頭部
.setTitle("調整商品價格")
//內容,獲取的是條目的name值
.setMessage(list.get(position).getName())
//輸入框
.setView(inflate)
//確定事件
.setPositiveButton("確定", new OnClickListener() {
public void onClick(DialogInterface dialog, int which) {
//ed_upd.getText().toString()獲取輸入框的值
//Integer.parseInt() 把String型別強轉成int型別
//list.get(position).setPrice()獲取點選條目的list值,修改price的內容
list.get(position).setPrice(Integer.parseInt(ed_upd.getText().toString()));
//重新整理介面卡
madapter.notifyDataSetChanged();
}
})
.create();
alertDialog.show();
}
});
}
private void initData() {
list=new ArrayList<Person>();
for (int i = 0; i <20; i++) {
list.add(new Person("喜羊羊與灰太狼",2200));
}
}
public class Madapter extends BaseAdapter{
@Override
public int getCount() {
return list.size();
}
@Override
public Object getItem(int position) {
return list.get(position);
}
@Override
public long getItemId(int position) {
return position;
}
@Override
public View getView(int position, View convertView, ViewGroup parent) {
// 優化
ViewHolder holder;
if (convertView==null) {
holder=new ViewHolder();
//獲取條目佈局
convertView=View.inflate(MainActivity.this,R.layout.wang, null);
//複用控制元件
holder.name=(TextView) convertView.findViewById(R.id.text_name);
holder.price=(TextView) convertView.findViewById(R.id.text_price);
//繫結
convertView.setTag(holder);
} else {
holder=(ViewHolder) convertView.getTag();
}
//給複用控制元件設定值
holder.name.setText(list.get(position).getName());
holder.price.setText(list.get(position).getPrice()+"");
return convertView;
}
}
class ViewHolder{
TextView name;
TextView price;
}
}