how to set update and delete button for every item in listview
Question
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"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="match_parent"
android:layout_height="match_parent"
tools:context=".MainActivity">
<ScrollView
android:id="@+id/scroll_view"
android:layout_width="match_parent"
android:layout_height="match_parent">
<LinearLayout
android:id="@+id/linearlayout1"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:orientation="vertical">
<TextView
android:id="@+id/tv_name1"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_marginLeft="30dp"
android:layout_marginTop="15dp"
android:layout_marginRight="30dp"
android:padding="15dp"
android:text="Name:"
android:textSize="15sp" />
<EditText
android:id="@+id/et_name1"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_marginLeft="30dp"
android:layout_marginRight="30dp"
android:hint="Enter Your Name"
android:padding="15dp"
android:textSize="15sp" />
<TextView
android:id="@+id/tv_email"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_marginLeft="30dp"
android:layout_marginRight="30dp"
android:padding="15dp"
android:text="Email:"
android:textSize="15dp" />
<EditText
android:id="@+id/et_email"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_marginLeft="30dp"
android:layout_marginRight="30dp"
android:hint="Enter Your Mail"
android:textSize="15dp" />
<TextView
android:id="@+id/tv_phoneno"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_marginLeft="30dp"
android:layout_marginRight="30dp"
android:padding="15dp"
android:text="Phone No:"
android:textSize="15dp" />
<EditText
android:id="@+id/et_phoneno"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_marginLeft="30dp"
android:layout_marginRight="30dp"
android:hint="Enter your Contact No"
android:padding="15dp"
android:textSize="15dp" />
<LinearLayout
android:layout_width="match_parent"
android:layout_height="match_parent"
android:orientation="horizontal"
android:padding="15dp"
android:weightSum="2">
<TextView
android:id="@+id/tv_dob"
android:layout_width="0dp"
android:layout_height="wrap_content"
android:layout_marginLeft="30dp"
android:layout_marginRight="30dp"
android:layout_weight="1"
android:text="DOB:"
android:textSize="15dp"
/>
<Button
android:id="@+id/datepicker1"
android:layout_width="0dp"
android:layout_height="30dp"
android:layout_marginLeft="30dp"
android:layout_marginRight="70dp"
android:layout_weight="1"
android:textSize="15dp">
</Button>
</LinearLayout>
<TextView
android:id="@+id/tv_qualification"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:layout_marginLeft="30dp"
android:layout_marginRight="30dp"
android:padding="15dp"
android:text="Qualification"
android:textSize="15dp" />
<EditText
android:id="@+id/et_qualification"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_marginLeft="30dp"
android:layout_marginRight="30dp"
android:hint="Enter Your Qualification"
android:padding="15dp"
android:textSize="15dp" />
<LinearLayout
android:id="@+id/linearlayout2"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:orientation="horizontal"
android:padding="15dp"
android:weightSum="2">
<TextView
android:id="@+id/tv_time"
android:layout_width="0dp"
android:layout_height="wrap_content"
android:layout_marginLeft="30dp"
android:layout_marginRight="30dp"
android:layout_weight="1"
android:text="Time:"
android:textSize="15dp"
/>
<Button
android:id="@+id/timepicker1"
android:layout_width="0dp"
android:layout_height="30dp"
android:layout_marginLeft="30dp"
android:layout_marginRight="70dp"
android:layout_weight="1"
android:textSize="15dp">
</Button>
</LinearLayout>
<Button
android:id="@+id/button_save"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="Save"
android:layout_gravity="center"
android:textSize="15dp">
</Button>
</LinearLayout>
</ScrollView>
</RelativeLayout>
MainActivity
import android.app.DatePickerDialog;
import android.app.TimePickerDialog;
import android.content.Intent;
import android.icu.text.SimpleDateFormat;
import android.os.Build;
import android.support.annotation.RequiresApi;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.view.View;
import android.widget.Button;
import android.widget.DatePicker;
import android.widget.EditText;
import android.widget.TextView;
import android.widget.TimePicker;
import java.text.ParseException;
import java.util.Calendar;
import java.util.Date;
import static android.content.Intent.EXTRA_EMAIL;
import static android.content.Intent.EXTRA_PHONE_NUMBER;
import static android.os.DropBoxManager.EXTRA_TIME;
import static android.security.KeyChain.EXTRA_NAME;
public class MainActivity extends AppCompatActivity implements View.OnClickListener {
public static final String EXTRA_NAME = "com.example.android.persondetails.EXTRA_NAME";
public static final String EXTRA_EMAIL = "com.example.android.persondetails.EXTRA_EMAIL";
public static final String EXTRA_PHONE_NUMBER = "com.example.android.persondetails.EXTRA_PHONE_NUMBER";
public static final String EXTRA_DOB = "com.example.android.persondetails.EXTRA_DOB";
public static final String EXTRA_QUALIFICATION = "com.example.android.persondetails.EXTRA_QUALIFICATION";
public static final String EXTRA_TIME = "com.example.android.persondetails.EXTRA_TIME";
Button button1, button2, button3;
TextView textView1, textView2, textView3, textView4, textView5, textView6;
EditText editText1, editText2, editText3, editText4;
private int mYear, mMonth, mDay, mHour, mMinute, format;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
button3 = (Button) findViewById(R.id.button_save);
textView1 = (TextView) findViewById(R.id.tv_name1);
textView2 = (TextView) findViewById(R.id.tv_email);
textView3 = (TextView) findViewById(R.id.tv_phoneno);
textView4 = (TextView) findViewById(R.id.tv_dob);
textView5 = (TextView) findViewById(R.id.tv_qualification);
textView6 = (TextView) findViewById(R.id.tv_time);
button1 = (Button) findViewById(R.id.datepicker1);
button2 = (Button) findViewById(R.id.timepicker1);
button1.setOnClickListener(this);
button2.setOnClickListener(this);
button3.setOnClickListener(this);
}
@Override
public void onClick(View v) {
if (v == button1) {
final Calendar c = Calendar.getInstance();
mYear = c.get(Calendar.YEAR);
mMonth = c.get(Calendar.MONTH);
mDay = c.get(Calendar.DAY_OF_MONTH);
format = c.get(Calendar.AM_PM);
DatePickerDialog datePickerDialog = new DatePickerDialog(this,
new DatePickerDialog.OnDateSetListener() {
@Override
public void onDateSet(DatePicker view, int year,
int monthOfYear, int dayOfMonth) {
textView4.setText(dayOfMonth + "-" + (monthOfYear + 1) + "-" + year);
}
}, mYear, mMonth, mDay);
datePickerDialog.show();
}
if (v == button2) {
final Calendar c = Calendar.getInstance();
mHour = c.get(Calendar.HOUR_OF_DAY);
mMinute = c.get(Calendar.MINUTE);
format = c.get(Calendar.AM_PM);
final TimePickerDialog timePickerDialog;
timePickerDialog = new TimePickerDialog(this,
new TimePickerDialog.OnTimeSetListener() {
@RequiresApi(api = Build.VERSION_CODES.N)
@Override
public void onTimeSet(TimePicker timePicker, int selectedHour, int selectedMinute) {
String time = selectedHour + ":" + selectedMinute;
SimpleDateFormat fmt = new SimpleDateFormat("HH:mm");
Date date = null;
try {
date = fmt.parse(time);
} catch (ParseException e) {
e.printStackTrace();
}
SimpleDateFormat fmtOut = new SimpleDateFormat("hh:mm aa");
String formattedTime = fmtOut.format(date);
textView6.setText(formattedTime);
}
}, mHour, mMinute, false);
timePickerDialog.setTitle("Select Time");
timePickerDialog.show();
}
if (v == button3) {
EditText editText1 = (EditText) findViewById(R.id.et_name1);
String text = editText1.getText().toString();
EditText editText2 = (EditText) findViewById(R.id.et_email);
String text1 = editText2.getText().toString();
EditText editText3 = (EditText) findViewById(R.id.et_phoneno);
String text2 = editText3.getText().toString();
TextView textView6 = (TextView) findViewById(R.id.datepicker1);
String text3 = textView6.getText().toString();
EditText editText4 = (EditText) findViewById(R.id.et_qualification);
String text4 = editText4.getText().toString();
TextView textView4 = (TextView) findViewById(R.id.timepicker1);
String text5 = textView4.getText().toString();
button3=(Button)findViewById(R.id.button_save);
Intent intent = new Intent(MainActivity.this, SecondActivity.class);
intent.putExtra(EXTRA_NAME, text);
intent.putExtra(EXTRA_EMAIL, text1);
intent.putExtra(EXTRA_PHONE_NUMBER, text2);
intent.putExtra(EXTRA_DOB, text3);
intent.putExtra(EXTRA_QUALIFICATION, text4);
intent.putExtra(EXTRA_TIME, text5);
startActivity(intent);
}
}
}
second_layout.xml
<?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="match_parent"
android:orientation="vertical"
>
<TextView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:id="@+id/tv_name1"
android:text="Name"
android:textSize="15dp"
/>
<TextView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:id="@+id/tv_phoneno"
android:layout_below="@+id/tv_name1"
android:text="contactno"
android:textSize="15dp"
/>
<TextView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_below="@+id/tv_phoneno"
android:id="@+id/tv_email"
android:text="Email"
android:textSize="15dp"
/>
<TextView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:id="@+id/tv_dob"
android:layout_below="@+id/tv_email"
android:text="DOB"
android:textSize="15dp"
/>
<TextView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:id="@+id/tv_qualification"
android:layout_below="@+id/tv_dob"
android:text="Qualification"
android:textSize="15dp"
/>
<TextView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:id="@+id/tv_time"
android:layout_below="@+id/tv_qualification"
android:text="Time"
android:textSize="15dp"
/>
<LinearLayout
android:layout_width="match_parent"
android:layout_height="match_parent"
android:orientation="horizontal"
android:layout_marginTop="120dp"
android:weightSum="2"
>
<Button
android:layout_width="0dp"
android:layout_height="wrap_content"
android:layout_below="@+id/tv_time"
android:layout_weight="1"
android:textSize="15dp"
android:text="Delete"
android:padding="10dp"
android:id="@+id/delete"
/>
<Button
android:layout_width="0dp"
android:layout_height="wrap_content"
android:layout_weight="1"
android:textSize="15dp"
android:text="Update"
android:id="@+id/update"
android:padding="10dp"
/>
</LinearLayout>
</RelativeLayout>
SecondActivity.java
package com.example.android.persondetails;
import android.content.Intent;
import android.os.Bundle;
import android.support.v7.app.AppCompatActivity;
import android.util.Log;
import android.widget.ArrayAdapter;
import android.widget.Button;
import android.widget.ListView;
import android.widget.TextView;
import java.util.ArrayList;
import java.util.List;
import static java.util.Calendar.AM;
public class SecondActivity extends AppCompatActivity {
private ListView lvPerson;
private Button addBtn,dleBtn;
private PersonListAdapter adapter;
private List<Person> mPersonList;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.list_view);
mPersonList = new ArrayList<Person>();
addBtn = (Button) findViewById(R.id.update);
dleBtn = (Button) findViewById(R.id.delete);
lvPerson = (ListView) findViewById(R.id.listView);
Intent intent = getIntent();
String text = (String) intent.getStringExtra(MainActivity.EXTRA_NAME);
String text1 = (String) intent.getStringExtra(MainActivity.EXTRA_PHONE_NUMBER);
String text2 = (String) intent.getStringExtra(MainActivity.EXTRA_EMAIL);
String text3 = (String) intent.getStringExtra(MainActivity.EXTRA_QUALIFICATION);
String text4 = (String) intent.getStringExtra(MainActivity.EXTRA_DOB);
String text5 = (String) intent.getStringExtra(MainActivity.EXTRA_TIME);
Log.d("PersonDetails", text + " " + text1 + "" + text2 + "" + text3 + "" + text4 + "" + text5);
mPersonList.add(0,new Person(text,text1,text2,text3,text4,text5));
addMethod();
setAdapter();
}
private void addMethod() {
mPersonList.add(1,new Person("Narendra", "83330072", "narendraprasad616@gmail.com", "btech", "14 / 06 / 1996", "5-30 AM"));
mPersonList.add(2,new Person("Banu", "715452", "naredra@gmail.com", "btech", "14 / 06 / 1996", "5-45 AM"));
mPersonList.add(3,new Person("Kalyan", "83330072", "narendraprad616@gmail.com", "btech", "14 / 06 / 1998", "5-30 AM"));
mPersonList.add(4,new Person("Teja", "8775564", "narendraprasa16@gmail.com", "btech", "14 / 06 / 1990", "5-30 AM"));
mPersonList.add(5,new Person("Manu", "86423", "narendraprad616@gmail.com", "btech", "14 / 06 / 1996", "5-30 AM"));
}
private void setAdapter() {
adapter = new PersonListAdapter(SecondActivity.this, mPersonList);
lvPerson.setAdapter(adapter);
}
}
how to set dailog to update button and one dailog should need to open it should be in editing what we had like in main activityxml after clicking delete it should be deleted,update means open dailog and reedit and update
PersonListAdapter.java
package com.example.android.persondetails;
import android.content.Context;
import android.os.Build;
import android.support.annotation.RequiresApi;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.BaseAdapter;
import android.widget.TextView;
import java.util.List;
public class PersonListAdapter extends BaseAdapter {
private Context mContext;
private List<Person> mPersonList;
PersonListAdapter(Context mContext, List<Person> mPersonList) {
this.mContext = mContext;
this.mPersonList = mPersonList;
}
@Override
public int getCount() {
return mPersonList.size();
}
@Override
public Object getItem(int position) {
return mPersonList.get(position);
}
@RequiresApi(api = Build.VERSION_CODES.P)
@Override
public View getView(int position, View convertView, ViewGroup parent) {
ViewHolder holder;
if (convertView == null) {
holder = new ViewHolder();
convertView = LayoutInflater.from(mContext).inflate(R.layout.second_layout, parent, false);
holder.tv_name = (TextView) convertView.findViewById(R.id.tv_name1);
holder.tv_contact = (TextView) convertView.findViewById(R.id.tv_phoneno);
holder.tv_email=(TextView)convertView.findViewById(R.id.tv_email);
holder.tv_dob=(TextView)convertView.findViewById(R.id.tv_dob);
holder.tv_qualification=(TextView)convertView.findViewById(R.id.tv_qualification);
holder.tv_time=(TextView)convertView.findViewById(R.id.tv_time);
convertView.setTag(holder);
} else {
holder = (ViewHolder) convertView.getTag();
}
holder.tv_name.setText(mPersonList.get(position).getName());
holder.tv_contact.setText(mPersonList.get(position).getContactno());
holder.tv_email.setText(mPersonList.get(position).getEmail());
holder.tv_dob.setText(mPersonList.get(position).getDatepicker());
holder.tv_qualification.setText(mPersonList.get(position).getQualification());
holder.tv_time.setText(mPersonList.get(position).getTimepicker());
return convertView;
}
@Override
public long getItemId(int position) {
return position;
}
class ViewHolder {
TextView tv_name;
TextView tv_email;
TextView tv_contact;
TextView tv_dob;
TextView tv_qualification;
TextView tv_time;
}
}
Person.java
package com.example.android.persondetails;
public class Person {
private String name;
private String contactno;
private String email;
private String qualification;
private String datepicker;
private String timepicker;
public Person(String name, String contactno, String email, String qualification, String datepicker, String timepicker) {
this.name = name;
this.contactno = contactno;
this.qualification=qualification;
this.datepicker=datepicker;
this.email=email;
this.timepicker=timepicker;
}
public String getName() {
return name == null ? "" : name;
}
public void setName(String name) {
this.name = name;
}
public String getContactno() {
return contactno;
}
public void setContactno(String contactno){
this.contactno=contactno;
}
public String getEmail() {
return email;
}
public String getQualification() {
return qualification;
}
public String getDatepicker() {
return datepicker;
}
public String getTimepicker() {
return timepicker;
}
}
list_view.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"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="match_parent"
android:layout_height="match_parent"
tools:context=".Person">
<ListView
android:id="@+id/listView"
android:layout_width="match_parent"
android:layout_height="match_parent">
</ListView>
</RelativeLayout>
AndroidManifest.xml
<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
package="com.example.android.persondetails">
<application
android:allowBackup="true"
android:icon="@mipmap/ic_launcher"
android:label="@string/app_name"
android:roundIcon="@mipmap/ic_launcher_round"
android:supportsRtl="true"
android:theme="@style/AppTheme"
>
<activity android:name=".SecondActivity">
</activity>
<activity android:name=".MainActivity"
android:parentActivityName=".MainActivity">
<intent-filter>
<action android:name="android.intent.action.MAIN" />
<category android:name="android.intent.category.LAUNCHER" />
</intent-filter>
</activity>
</application>
</manifest>
2 answers
solution1
0 2019-06-25 13:25:18
您可以使用按钮单击侦听器将您的逻辑放在getView（）方法中。
solution2
0 ACCPTED 2019-06-26 06:27:40
You need to add two buttons such as Update and Delete in the list item's layout. So the list holder class will look like:
class ViewHolder {
TextView tv_name;
TextView tv_email;
TextView tv_contact;
TextView tv_dob;
TextView tv_qualification;
TextView tv_time;
Button btn_update; //Update for item
Button btn_delete; //Delete an item.
}
Once you have done this then do the following in adapter's getView() method. Notice the comments carefully to understand the implementational logic further.
public View getView(int position, View convertView, ViewGroup parent) {
ViewHolder holder;
if (convertView == null) {
holder = new ViewHolder();
convertView = LayoutInflater.from(mContext).inflate(R.layout.second_layout, parent, false);
holder.tv_name = (TextView) convertView.findViewById(R.id.tv_name1);
holder.tv_contact = (TextView) convertView.findViewById(R.id.tv_phoneno);
holder.tv_email=(TextView)convertView.findViewById(R.id.tv_email);
holder.tv_dob=(TextView)convertView.findViewById(R.id.tv_dob);
holder.tv_qualification=(TextView)convertView.findViewById(R.id.tv_qualification);
holder.tv_time=(TextView)convertView.findViewById(R.id.tv_time);
//bind holder.btn_update and holder.btn_delete here
convertView.setTag(holder);
} else {
holder = (ViewHolder) convertView.getTag();
}
holder.tv_name.setText(mPersonList.get(position).getName());
holder.tv_contact.setText(mPersonList.get(position).getContactno());
holder.tv_email.setText(mPersonList.get(position).getEmail());
holder.tv_dob.setText(mPersonList.get(position).getDatepicker());
holder.tv_qualification.setText(mPersonList.get(position).getQualification());
holder.tv_time.setText(mPersonList.get(position).getTimepicker());
holder.btn_update.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
//Call your dialog to update and pass "mPersonList.get(position)" model so that data in the model will be updated.
//Once update is done call refreshList() from the confirmation dialog button.
}
});
holder.btn_delete.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
mPersonList.remove(position);
refreshList();
}
});
return convertView;
}
private void refreshList() {
notifyDataSetChanged();
}
One suggestion, try to avoid using variables like button1, button2, editText1, textView1 like school students. Instead of these, use a proper and meaningful name for the variables.
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