Android ListView ViewHolder only displaying one view

Android ListView ViewHolder only displaying one view - android

I'm having a weird problem with my viewholders. I'm trying to create an activity that allows the user to choose multiple dates from datepicker dialog (this works) and then make a list of the chosen dates and add a timepicker for each of them. E.g 22-02-2014 14:00 (the 14:00 depicting a timepicker for that date). So if 5 dates were chosen, 5 rows would appear with each containing a chosen date and its own timepicker.
Currently creating the list from chosen dates works but timepicker won't appear no matter what I attempt. Only the textview containing the date is shown in the holder.
I've been searching for solution for several hours but I can't seem to find similar issues which indicates something is seriously wrong on my end. Just can't fathom what that might be.
The relevant code (omitting the activity itself since it works as supposed with list and all):
import java.util.ArrayList;
import android.app.Activity;
import android.content.Context;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.ArrayAdapter;
import android.widget.TextView;
import android.widget.TimePicker;
public class RandomListAdapter extends ArrayAdapter<String> {
static Context mContext;
private static class ViewHolder {
private View row;
private TextView date;
private TimePicker tp;
public ViewHolder(View row) {
this.row = row;
}
public void setDate(String date) {
this.date.setText(date);
}
public void initTp(TimePicker tp){
this.tp = tp;
}
public void setHour(int h) {
tp.setCurrentHour(h);
}
public void setMin(int m){
tp.setCurrentMinute(m);
}
public TextView getDate() {
if(date==null) {
date = (TextView) row.findViewById(R.id.rr_date_item);
}
return date;
}
public TimePicker getTp() {
if(tp==null) {
tp = (TimePicker) row.findViewById(R.id.rr_tp);
}
return tp;
}
}
private static RandomListAdapter instance = null;
private ArrayList<String> items;
public RandomListAdapter(Context context) {
super(context, 0);
mContext = context;
items = new ArrayList<String>();
}
public void updateList(ArrayList<String> l){
items = l;
super.notifyDataSetChanged();
}
#Override
public int getCount() {
return items.size();
}
#Override
public String getItem(int position) {
return items.get(position);
}
#Override
public long getItemId(int position) {
return position;
}
#Override
public int getViewTypeCount() {
return 1;
}
#Override
public View getView(int position, View convertView, ViewGroup parent) {
String s = (String)items.get(position);
ViewHolder vH = null;
if(convertView == null){
LayoutInflater inflater = ((Activity) mContext).getLayoutInflater();
convertView = inflater.inflate(R.layout.rr_row_layout, null);
vH = new ViewHolder(convertView);
vH.date = vH.getDate();
vH.tp = vH.getTp();
convertView.setTag(vH);
}
else {
vH = (ViewHolder) convertView.getTag();
}
if(vH != null && s != null) {
vH.setDate(s);
}
return convertView;
}
public static RandomListAdapter getInstance(Context mContext) {
if(instance == null) {
instance = new RandomListAdapter(mContext);
}
return instance;
}
}
The xml file:
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="fill_parent"
android:layout_height="?android:attr/listPreferredItemHeight"
android:minHeight="?android:attr/listPreferredItemHeight"
android:orientation="horizontal"
android:showDividers="middle"
android:divider="?android:attr/dividerHorizontal" >
<TextView
android:paddingLeft="?android:attr/listPreferredItemPaddingLeft"
android:id="#+id/rr_date_item"
android:layout_width="wrap_content"
android:layout_height="fill_parent"
android:gravity="center_vertical|left"
android:ellipsize="end"
android:singleLine="true"
android:layout_weight="0"
android:textAlignment="gravity"
android:textSize="18sp" />
<TimePicker
android:id="#+id/rr_tp"
android:layout_width="0dip"
android:layout_height="0dip"
android:layout_weight="1" />
</LinearLayout>
Thanks in advance and my apologies if I'm missing something obvious.

This could be a problem
android:layout_height="0dip"
on your TimePicker. Change the height to wrap_content. Only the width needs to be 0dp when using weight.

Related

Addidng data to ListView by the own adapter [duplicate]

This question already has an answer here:
ListView not showing at all
(1 answer)
Closed 4 years ago.
I need to add data to ListView by adapter. Adapter has some data.
As you can see here, the size of ArrayList is 417.But when I open the activity where the ListView is, I don't see anything here. Here's the code of adapter:
package asus.example.com.player;
import android.annotation.SuppressLint;
import android.content.Context;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.BaseAdapter;
import android.widget.LinearLayout;
import android.widget.TextView;
import java.util.ArrayList;
public class SongAdapter extends BaseAdapter {
private ArrayList<Song> songs;
private LayoutInflater layoutInflater;
SongAdapter(Context context, ArrayList<Song> songs){
this.songs = songs;
layoutInflater = LayoutInflater.from(context);
}
#Override
public int getCount() {
return 0;
}
#Override
public Object getItem(int position) {
return null;
}
#Override
public long getItemId(int position) {
return 0;
}
#Override
public View getView(int position, View convertView, ViewGroup parent) {
#SuppressLint("ViewHolder")
LinearLayout songLay = (LinearLayout) layoutInflater.inflate(R.layout.song, parent, false);
TextView songTitle = songLay.findViewById(R.id.songTitle);
TextView songArtist = songLay.findViewById(R.id.songArtist);
Song curSong = songs.get(position);
songTitle.setText(curSong.getTitle());
songArtist.setText(curSong.getArtist());
songLay.setTag(position);
return songLay;
}
Code of Song class:
package asus.example.com.player;
public class Song {
private long id;
private String title;
private String artist;
public long getId() {
return id;
}
public String getTitle() {
return title;
}
String getArtist() {
return artist;
}
Song(long id, String title, String artist){
this.id = id;
this.title = title;
this.artist = artist;
}
}
Song.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/songTitle"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:textColor="#1111ff"
android:textSize="20sp"
android:textStyle="bold"/>
<TextView
android:id="#+id/songArtist"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:textColor="#2a7800"
android:textSize="18sp" />
</LinearLayout>
Layout of ativity, where there is a ListView:
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout 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=".ListOfSongsActivity">
<ScrollView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
tools:ignore="UselessParent">
<ListView
android:id="#+id/songList"
android:layout_width="match_parent"
android:layout_height="wrap_content"
tools:ignore="NestedScrolling" />
</ScrollView>
</LinearLayout>

See this you are wrong here
#Override
public int getCount() {
return 0;
}
Make it
#Override
public int getCount() {
return songs.size();
}
Remove these two methods also:
#Override
public Object getItem(int position) {
return null;
}
#Override
public long getItemId(int position) {
return 0;
}
Explanation Adapter uses getCount() method to identify the size of List and recyclerview you are returning 0 here means you have 0 items in listview. What actually we need is return the total items size which is songs.size().
Hope this will give you a proper guidence.

Make following changes in your adapter class and check once
#Override
public int getCount() {
//return 0;
return songs.size();
}

spinner initialization in a custom view

I try to make a custom view but I've got a problem with the spinner.
When I launch the application everything is ok. Preferences are read and the spinner setSelection method work great (display picture is ok).
When I change the spinner value, there is no problem too : Preferences are saved and when I start the application the new choice is display.
My problem comes when rotating the device, all my spinner value are reset to the last spinner value (vv2 in my code). I really don't understand...
Here is my code :
The widget_value_view.xml
<?xml version="1.0" encoding="utf-8"?>
<merge xmlns:android="http://schemas.android.com/apk/res/android" >
<Spinner
android:id="#+id/my_spinner"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_centerVertical="true"
android:background="#android:color/transparent" />
<TextView
android:id="#+id/my_value_tv"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_marginLeft="15dp"
android:layout_centerVertical="true"
android:background="#android:color/transparent" />
</merge>
The ValueView.java class :
package com.example.spinnertest;
import java.util.Arrays;
import java.util.List;
import android.content.Context;
import android.content.res.TypedArray;
import android.util.AttributeSet;
import android.view.Gravity;
import android.view.LayoutInflater;
import android.widget.LinearLayout;
import android.widget.Spinner;
import android.widget.TextView;
public class ValueView extends LinearLayout {
protected TextView mValueTv = null;
protected Spinner mSpinner = null;
protected List<String> mChoiceList;
private MySpinnerAdapter mSpinnerAdapter;
public ValueView(Context context) {
super(context);
}
public ValueView(Context context, AttributeSet attributes){
super(context,attributes);
TypedArray a = context.getTheme().obtainStyledAttributes(attributes,R.styleable.ValueView,0, 0);
try {
String valueList = a.getString(R.styleable.ValueView_valueList);
mChoiceList = Arrays.asList(valueList.split("\\|"));
} finally {
a.recycle();
}
setOrientation(LinearLayout.HORIZONTAL);
setGravity(Gravity.CENTER_VERTICAL);
LayoutInflater inflater = (LayoutInflater) context.getSystemService(Context.LAYOUT_INFLATER_SERVICE);
inflater.inflate(R.layout.widget_value_view, this, true);
mSpinner = (Spinner) getChildAt(0);
mValueTv = (TextView) getChildAt(1);
mSpinnerAdapter = new MySpinnerAdapter(context, mChoiceList);
mSpinner.setAdapter(mSpinnerAdapter);
}
/**
* Change textview value
*/
public void setValue(double value,String format){
mValueTv.setText("todo");
invalidate();
requestLayout();
}
/**
* Set the current item of the spinner
* #param position of the item
*/
public void setSelection(int position, boolean animate) {
// mSpinnerAdapter.notifyDataSetChanged();
mSpinner.setSelection(position,animate);
// invalidate();
// requestLayout();
}
public int getSelectedItemPosition() {
return mSpinner.getSelectedItemPosition();
}
}
In this class I use a adapter define with 2 layout and one class :
MySpinnerAdapter.java
package com.example.spinnertest;
import java.util.List;
import android.content.Context;
import android.util.Log;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.BaseAdapter;
import android.widget.ImageView;
import android.widget.TextView;
public class MySpinnerAdapter extends BaseAdapter {
public static final String ITEM_ALTITUDE = "altitude";
public static final String ITEM_SPEED = "speed";
public static final String ITEM_DISTANCE = "distance";
private static final String LOG_TAG = "SPINNER_TEST";
private Context mContext;
private List<String> mChoiceList;
public MySpinnerAdapter(Context context, List<String> values) {
this.mContext = context;
this.mChoiceList = values;
}
#Override
public int getCount() {
return mChoiceList.size();
}
#Override
public Object getItem(int position) {
return mChoiceList.get(position);
}
#Override
public long getItemId(int position) {
return position;
}
#Override
public View getView(int position, View convertView, ViewGroup parent) {
if (convertView == null) {
LayoutInflater layout = (LayoutInflater) mContext.getSystemService(Context.LAYOUT_INFLATER_SERVICE);
convertView = layout.inflate(R.layout.item_spinner_value, null);
}
ImageView imView = (ImageView) convertView.findViewById(R.id.item_spinner_value_iv);
Log.d(LOG_TAG,"Spinner Adapter position = " + String.valueOf(position));
imView.setImageResource(getSpinnerItemImage(position));
return convertView;
}
#Override
public View getDropDownView(int position, View convertView, ViewGroup parent) {
if (convertView == null) {
LayoutInflater layout = (LayoutInflater) mContext.getSystemService(Context.LAYOUT_INFLATER_SERVICE);
convertView = layout.inflate(R.layout.item_spinner_list, null);
}
ImageView imView = (ImageView) convertView.findViewById(R.id.item_spinner_list_iv);
TextView textView = (TextView) convertView.findViewById(R.id.item_spinner_list_tv);
textView.setText(mChoiceList.get(position));
imView.setImageResource(getSpinnerItemImageSmall(position));
return convertView;
}
private int getSpinnerItemImageSmall(int position) {
String item = mChoiceList.get(position);
if (item.equals(ITEM_ALTITUDE)) {
return R.drawable.altitude_small;
} else if (item.equals(ITEM_DISTANCE)) {
return R.drawable.distance_small;
} else if (item.equals(ITEM_SPEED)) {
return R.drawable.vitesse_small;
} else {
return R.drawable.date_small;
}
}
private int getSpinnerItemImage(int position) {
String item = mChoiceList.get(position);
if (item.equals(ITEM_ALTITUDE)) {
return R.drawable.altitude;
} else if (item.equals(ITEM_DISTANCE)) {
return R.drawable.distance;
} else if (item.equals(ITEM_SPEED)) {
return R.drawable.vitesse;
} else {
return R.drawable.date;
}
}
}
and the 2 layout item_spinner_list.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" >
<ImageView
android:id="#+id/item_spinner_list_iv"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_centerVertical="true"
android:padding="5dp"
android:src="#android:drawable/ic_menu_gallery" />
<TextView
android:id="#+id/item_spinner_list_tv"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_centerVertical="true"
android:padding="5dp"
android:layout_toRightOf="#+id/item_spinner_list_iv"
android:text="Durée" />
</RelativeLayout>
and item_spinner_value.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:background="#android:color/transparent" >
<ImageView
android:id="#+id/item_spinner_value_iv"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_centerVertical="true"
android:padding="5dp"
android:src="#android:drawable/ic_menu_gallery" />
</RelativeLayout>
and finally my MainActivity.java
package com.example.spinnertest;
import android.app.Activity;
import android.content.SharedPreferences;
import android.os.Bundle;
import android.preference.PreferenceManager;
public class MainActivity extends Activity {
private SharedPreferences mPref;
private ValueView mVv1;
private ValueView mVv2;
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
mPref = PreferenceManager.getDefaultSharedPreferences(getApplicationContext());
mVv1 = (ValueView)findViewById(R.id.value1);
mVv2 = (ValueView)findViewById(R.id.value2);
mVv1.setSelection(mPref.getInt("pref_val1", 0),false);
mVv2.setSelection(mPref.getInt("pref_val2", 1),false);
}
#Override
public void onPause() {
SharedPreferences.Editor editor = mPref.edit();
editor.putInt("pref_val1", mVv1.getSelectedItemPosition());
editor.putInt("pref_val2", mVv2.getSelectedItemPosition());
editor.commit();
super.onPause();
}
}
and the layout :
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:custom="http://schemas.android.com/apk/res/com.example.spinnertest"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="match_parent"
android:layout_height="match_parent" >
<com.example.spinnertest.ValueView
android:id="#+id/value1"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignParentLeft="true"
android:layout_margin="10dp"
android:background="#android:color/transparent"
custom:valueList="speed|altitude|distance" />
<com.example.spinnertest.ValueView
android:id="#+id/value2"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignParentLeft="true"
android:layout_below="#+id/value1"
android:layout_margin="10dp"
custom:valueList="speed|altitude|distance" />
</RelativeLayout>

I cannot really explain why your code is not working, but I would prefer to save the state of the spinner locally (I mean in the activity); it's the normal Android workflow for screen rotation.
Something like this:
String MVV1="1";
String MVV2="2";
#Override
protected void onCreate(Bundle savedInstanceState) {
setContentView(R.layout.activity_main);
mPref = PreferenceManager.getDefaultSharedPreferences(getApplicationContext());
mVv1 = (ValueView)findViewById(R.id.value1);
mVv2 = (ValueView)findViewById(R.id.value2);
if (savedInstanceState != null) {
mVv1.setSelection(savedInstanceState.getInt(MVV1),false);
mVv2.setSelection(savedInstanceState.getInt(MVV2),false);
}
else{
mVv1.setSelection(mPref.getInt("pref_val1", 0),false);
mVv2.setSelection(mPref.getInt("pref_val2", 1),false);
}
}
#Override
public void onPause() {
SharedPreferences.Editor editor = mPref.edit();
editor.putInt("pref_val1", mVv1.getSelectedItemPosition());
editor.putInt("pref_val2", mVv2.getSelectedItemPosition());
editor.commit();
super.onPause();
}
#Override
protected void onSaveInstanceState (Bundle outState) {
super.onSaveInstanceState(outState);
outState.putInt(MVV1, mVv1.getSelectedItemPosition());
outState.putInt(MVV2, mVv2.getSelectedItemPosition());
}
My syntax is maybe not perfect because I wrote it in the SO editor but hope you got the idea: the status is written in the Preferences as soon as the Activity is paused but if the activity rotates (your method should work but maybe is there a cache to access to the preferences or something...) then, it'll use the specific bundle for it: the one which is filled just when the screen rotates and used when the screen is recreated.
Test it and say if it's working ;)

Android: ListView headers lost when scrolling

So I have the following view
list_view_item.xml
<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:id="#+id/layoutSessionItem"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:orientation="horizontal" >
<TextView
android:id="#+id/lblGroupDate"
style="#style/CustomText.GrayTitle"
android:layout_width="match_parent"
android:layout_height="wrap_content" >
</TextView>
<LinearLayout
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:orientation="vertical" >
<TextView
android:id="#+id/lblCourseCode"
style="#style/CustomText.GrayText"
android:layout_width="wrap_content"
android:layout_height="wrap_content" />
<TextView
android:id="#+id/lblSessionCode"
style="#style/CustomText.GrayText"
android:layout_width="wrap_content"
android:layout_height="wrap_content" />
</LinearLayout>
</RelativeLayout>
So basically I get the following data from the database:
COURSE_CODE
SESSION_CODE
SESSION_DATE
I need to group the ListView items by SESSION_DATE, what I do is I keep a variable called "PreviousDate" and I compare it to the current SESSION_DATE, if it's different then I enable the header with the ID: "lblGroupDate" if the dates are the same I Hide "lblGroupDate".
Here's my Adapter:
public class SessionListAdapter extends BaseAdapter {
private Date PreviousDate = new Date();
static class ViewHolder {
TextView lblGroupDate;
TextView lblCourseCode;
TextView lblSessionCode;
}
#Override
public View getView(int position, View convertView, ViewGroup parent) {
ViewHolder holder;
if (convertView == null) {
convertView = mLayoutInflater.inflate(R.layout.list_view_item, null);
holder = new ViewHolder();
holder.lblGroupDate = (TextView) convertView.findViewById(R.id.lblGroupDate);
holder.lblCourseCode = (TextView) convertView.findViewById(R.id.lblCourseCode);
holder.lblSessionCode = (TextView) convertView.findViewById(R.id.lblSessionCode);
} else {
holder = (ViewHolder)convertView.getTag();
}
SessionData session = (SessionData) getItem(position);
if(session != null) {
Date sessionDate = session.SESSION_DATE;
if (!mPrevDate.equals(sessionDate)) {
PreviousDate = sessionDate;
// HIDE GROUP HEADER
holder.lblGroupDate.setVisibility(View.GONE);
}
else {
// SHOW GROUP HEADER
holder.lblGroupDate.setVisibility(View.VISIBLE);
}
holder.lblCourseCode.setText(session.COURSE_CODE);
holder.lblSessionCode.setText(session.SESSION_CODE);
}
}
}
Here's the PROBLEM:
Lets say I have 20 records, when I scroll down and then scroll up again the rows that had the Group Header (lblGroupDate) enabled get shifted up without a header, it's the header was shifted to the next 3 rows. Why is this happening?

It's happening because getView() can be called at anytime and out-of-order from your data-set. You need to create a data-set that the adapter can be backed by. Just sorting your adapter out. Will update answer with code in a moment.
SessionListAdapter.java
import java.util.ArrayList;
import java.util.Date;
import java.util.List;
import android.content.Context;
import android.text.format.DateUtils;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.BaseAdapter;
import android.widget.TextView;
public class SessionListAdapter extends BaseAdapter
{
private static final int TYPE_GROUP = 0;
private static final int TYPE_SESSION = 1;
private static final int MAX_TYPES = 2;
private final LayoutInflater mLayoutInflater;
private ArrayList<SessionViewData> mData;
public SessionListAdapter(Context context, List<SessionData> sessionData)
{
mLayoutInflater = LayoutInflater.from(context);
updateSessionViewData(sessionData);
}
public void updateSessionViewData(List<SessionData> sessionData)
{
Date previousDate = new Date();
ArrayList<SessionViewData> data = new ArrayList<SessionViewData>();
for(SessionData session: sessionData){
if(!previousDate.equals(session.SESSION_DATE)){
data.add(new SessionViewData(TYPE_GROUP, session));
previousDate = session.SESSION_DATE;
}
data.add(new SessionViewData(TYPE_SESSION, session));
}
mData = data;
notifyDataSetChanged();
}
#Override
public View getView(int position, View convertView, ViewGroup parent)
{
SessionViewData data = mData.get(position);
if(convertView == null){
final int layoutId;
switch(data.type){
case TYPE_GROUP: layoutId = R.layout.list_session_group; break;
case TYPE_SESSION: layoutId = R.layout.list_session_item; break;
default:
throw new IllegalArgumentException("Bad type for: " + data.session);
}
convertView = mLayoutInflater.inflate(layoutId, parent, false);
}
switch(data.type){
case TYPE_GROUP:
TextView lblGroupDate = ((TextView)convertView.findViewById(R.id.lblGroupDate));
lblGroupDate.setText(DateUtils.formatDateTime(convertView.getContext(),
data.session.SESSION_DATE.getTime(), DateUtils.FORMAT_SHOW_DATE));
break;
case TYPE_SESSION:
TextView lblCourseCode = (TextView)convertView.findViewById(R.id.lblCourseCode);
lblCourseCode.setText(data.session.COURSE_CODE);
TextView lblSessionCode = (TextView)convertView.findViewById(R.id.lblSessionCode);
lblSessionCode.setText(data.session.SESSION_CODE);
break;
}
return convertView;
}
#Override
public Object getItem(int position)
{
return mData.get(position);
}
#Override
public long getItemId(int position)
{
return position;
}
#Override
public int getItemViewType(int position)
{
return mData.get(position).type;
}
#Override
public int getViewTypeCount()
{
return MAX_TYPES;
}
#Override
public int getCount()
{
return mData.size();
}
static class SessionViewData
{
int type;
SessionData session;
public SessionViewData(int type, SessionData session)
{
this.type = type;
this.session = session;
}
}
}
list_session_group.xml
<?xml version="1.0" encoding="utf-8"?>
<TextView xmlns:android="http://schemas.android.com/apk/res/android"
android:id="#+id/lblGroupDate"
android:layout_width="match_parent"
android:layout_height="wrap_content"
style="#style/CustomText.GrayTitle"
/>
list_session_item.xml
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:id="#+id/layoutSessionItem"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:orientation="vertical"
>
<TextView
android:id="#+id/lblCourseCode"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
style="#style/CustomText.GrayText"
/>
<TextView
android:id="#+id/lblSessionCode"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
style="#style/CustomText.GrayText"
/>
</LinearLayout>

How to get values from dynamically created LinearLayout in android

I'm new to android. Started learning recently.
I have created a LinearLayout dynamically. I have the following fields in LinearLayout:
1. Customer name
2. Edit Button
3. Delete Button.
Orientation is horizontal.
Now I want to delete a single record when I click on delete button. How can I get row id in this case and later I can pass to database to delete the record. Here is the code.
user_list_view_item_row.xml
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:orientation="horizontal"
android:layout_width="fill_parent"
android:layout_height="fill_parent"
android:background="#drawable/bg_main"
>
<TextView android:id="#+id/txtTitle"
android:layout_width="wrap_content"
android:layout_height="fill_parent"
android:gravity="center_vertical"
android:textStyle="bold"
android:textSize="50dp"
android:textColor="#FFFFFF"
android:layout_marginTop="5dp"
android:layout_marginBottom="5dp" />
<Button
android:id="#+id/userListEditButton"
style="#style/SpecialText"
android:layout_width="50dp"
android:layout_height="50dp"
android:typeface="monospace"
android:text="#string/save"
android:layout_marginTop="5dp"
android:layout_marginBottom="5dp" />
<Button
android:id="#+id/userListDeleteButton"
style="#style/SpecialText"
android:layout_width="50dp"
android:layout_height="50dp"
android:typeface="monospace"
android:text="#string/reset"
android:layout_marginTop="5dp"
android:layout_marginBottom="5dp" />
</LinearLayout>
UserAdapter.java
package com.rad.mobileshop.activities;
import java.sql.SQLException;
import android.app.Activity;
import android.content.Context;
import android.view.LayoutInflater;
import android.view.View;
import android.view.View.OnClickListener;
import android.view.ViewGroup;
import android.widget.ArrayAdapter;
import android.widget.Button;
import android.widget.TextView;
import com.rad.mobileshop.common.entities.User;
import com.rad.mobileshop.db.DBAdapter;
public class UserAdapter extends ArrayAdapter<User> {
Context context;
int layoutResourceId;
User data[] = null;
private DBAdapter mdb;
public UserAdapter(Context context, int layoutResourceId, User[] data) {
super(context, layoutResourceId, data);
this.layoutResourceId = layoutResourceId;
this.context = context;
this.data = data;
mdb = new DBAdapter(context);
}
#Override
public View getView(int position, View convertView, ViewGroup parent) {
View row = convertView;
UserHolder holder = null;
if (row == null) {
LayoutInflater inflater = ((Activity) context).getLayoutInflater();
row = inflater.inflate(layoutResourceId, parent, false);
holder = new UserHolder();
holder.txtTitle = (TextView) row.findViewById(R.id.txtTitle);
holder.editButton = (Button) row
.findViewById(R.id.userListEditButton);
holder.deleteButton = (Button) row
.findViewById(R.id.userListDeleteButton);
row.setTag(holder);
} else {
holder = (UserHolder) row.getTag();
}
User user = data[position];
holder.txtTitle.setText(user.getName());
holder.editButton.setText("Edit");
holder.deleteButton.setText("Delete");
holder.editButton.setOnClickListener(new OnClickListener() {
public void onClick(View view) {
System.out.println("hello Edit");
}
});
holder.deleteButton.setOnClickListener(new OnClickListener() {
public void onClick(View view) {
System.out.println("hello delete ");
}
});
return row;
}
private void deleteUserDetails(int userId) {
try {
mdb.open();
mdb.deleteUserDetails(userId);
} catch (SQLException e1) {
e1.printStackTrace();
}
}
static class UserHolder {
TextView txtTitle;
Button editButton;
Button deleteButton;
}
}
User.java
package com.rad.mobileshop.common.entities;
public class User {
private int id;
private String name;
private String type;
public User() {
super();
}
public User(int id, String name, String type) {
super();
this.id = id;
this.name = name;
this.type = type;
}
public int getId() {
return id;
}
public void setId(int id) {
this.id = id;
}
public String getName() {
return name;
}
public void setName(String name) {
this.name = name;
}
public String getType() {
return type;
}
public void setType(String type) {
this.type = type;
}
#Override
public String toString() {
return this.name ;
}
}

First you need to change your User[] array into an ArrayList, because you cannot dynamically remove an element for a primitive array. (At least not as easily and ArrayAdapter is already designed to work with ArrayLists in this circumstance.)
Next let's save position in deleteButton in getView() for easy access:
holder.deleteButton.setTag(position);
Last add this to your delete OnClickListener:
public void onClick(View view) {
User user = getItem((Integer) view.getTag()));
remove(user);
deleteUserDetails(user.getId());
}
There are an couple minor adjustments that I didn't cover, like changing UserAdapter's constructor and data[position] in getView(), but they are easy fixes.
Optional advice:
You should create only one LayoutInflater in your constructor and simply re-use it in getView()
You don't need to store a copy of data in UserAdapter, it is already stored in ArrayAdapter, simply access it with getItem(position).
You can streamline getView() by moving every command that doesn't change into the if(row == null) block.
All that said, I'm not sure why you extended ArrayAdapter if you are working with a database. I suggest switching to a custom CursorAdapter, but this isn't required.

Android custom listview row

I'm struggling with assigning my listview row more than one textview.
I want my row to have one textview for a person's name, one for address and one for age - but I'm not succeeding in doing so.
If someone could provide me with a simple example, that would be great.
Thanks!
Here's my custom ArrayAdapter
import java.util.ArrayList;
import android.content.Context;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.BaseAdapter;
import android.widget.TextView;
public class MyAdapter extends BaseAdapter {
private LayoutInflater mInflater = null;
private ArrayList<Invoice> peopleList;
private final class ViewHolder {
TextView kidLabel;
TextView restLabel;
TextView fristLabel;
TextView amountLabel;
}
private ViewHolder mHolder = null;
public MyAdapter(Context context) {
Context mContext = context;
mInflater = (LayoutInflater) mContext
.getSystemService(Context.LAYOUT_INFLATER_SERVICE);
}
#Override
public int getCount() {
return peopleList.size();
}
#Override
public Object getItem(int position) {
return position;
}
#Override
public long getItemId(int position) {
return position;
}
#Override
public View getView(int position, View convertView, ViewGroup parent) {
if (convertView == null) {
mHolder = new ViewHolder();
convertView = mInflater.inflate(R.layout.row, null);
convertView.setTag(mHolder);
} else {
mHolder = (ViewHolder) convertView.getTag();
}
mHolder.kidLabel = (TextView) convertView.findViewById(R.id.kidLabel);
mHolder.kidLabel.setText(peopleList.get(position).getKID());
mHolder.fristLabel = (TextView) convertView
.findViewById(R.id.fristLabel);
mHolder.fristLabel.setText(peopleList.get(position).getDueDate());
mHolder.restLabel = (TextView) convertView.findViewById(R.id.restLabel);
mHolder.restLabel.setText(peopleList.get(position).getDueAmount());
mHolder.amountLabel = (TextView) convertView
.findViewById(R.id.amountLabel);
mHolder.amountLabel.setText(peopleList.get(position).getDueAmount());
return convertView;
}
}
And Here's my custom row xml:
<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:id="#+id/RelativeLayout1"
android:layout_width="fill_parent"
android:layout_height="fill_parent" >
<ImageView
android:id="#+id/imageView1"
android:layout_width="fill_parent"
android:layout_height="45dip"
android:src="#drawable/cellback" android:scaleType="fitXY"/>
<TextView
android:id="#+id/kidLabel"
android:layout_width="160dip"
android:layout_height="25dip"
android:layout_alignParentLeft="true"
android:layout_alignParentTop="true"
android:textSize="13dip" android:textColor="#333"/>
<TextView
android:id="#+id/fristLabel"
android:layout_width="160dip"
android:layout_height="20dip"
android:layout_marginTop="25dip"
android:textSize="11dip" android:textColor="#999"/>
<TextView
android:id="#+id/amountLabel"
android:layout_width="160dip"
android:layout_height="25dip"
android:layout_alignParentLeft="true"
android:layout_alignParentTop="true"
android:textSize="13dip" android:layout_marginLeft="160dip" android:gravity="right" android:textColor="#333"/>
<TextView
android:id="#+id/restLabel"
android:layout_width="160dip"
android:layout_height="20dip"
android:layout_alignParentLeft="true"
android:layout_alignParentTop="true"
android:textSize="11dip" android:layout_marginLeft="160dip" android:layout_marginTop="25dip" android:gravity="right" android:textColor="#999"/>
</RelativeLayout>

First,you should create a xml to describe what your list cell likes,called cell.xml,for example:
<?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" android:background="#color/spink">
<TextView
android:id="#+id/name_textView"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="Name"
android:textAppearance="?android:attr/textAppearanceLarge" />
<TextView
android:id="#+id/address_textView"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="Address"
android:textAppearance="?android:attr/textAppearanceMedium" />
</LinearLayout>
Second,create a adapter.It helps your listview to show data:
public class MyAdapter extends BaseAdapter {
private LayoutInflater mInflater = null;
private ArrayList<People> peopleList;
private final class ViewHolder {
TextView nameTextView;
TextView addressTextView;
}
private ViewHolder mHolder = null;
public MyAdapter(Context context) {
mContext = context;
mInflater = (LayoutInflater)mContext.getSystemService(Context.LAYOUT_INFLATER_SERVICE);
}
#Override
public int getCount() {
return peopleList.size();
}
#Override
public Object getItem(int position) {
return position;
}
#Override
public long getItemId(int position) {
return position;
}
#Override
public View getView(int position, View convertView, ViewGroup parent) {
if(convertView == null) {
mHolder = new ViewHolder();
convertView = mInflater.inflate(R.layout.cell, null);
convertView.setTag(mHolder);
} else {
mHolder = (ViewHolder)convertView.getTag();
}
mHolder.nameTextView (TextView)convertView.findViewById(R.id.name_textView);
mHolder.nameTextView.setText(peopleList.get(position).getName());
mHolder.addressTextView = (TextView)convertView.findViewById(R.id.address_textView);
mHolder.addressTextView.setText(peopleList.get(position).getAddress());
return convertView;
}
}
Finally,when you want to show the data,do this in your activity:
listView.setAdapter(new MyAdapter());
hope it helps you.

You need to create a custom listview layout and a custom array adapter (I have also created a custom class to work with the layout).
An example of this is:
Custom class that works with the custom listview layout:
package id10778734.sceresini.week4.exercise3.views;
import id10778734.sceresini.week4.exercise3.R;
import id10778734.sceresini.week4.exercise3.Constants;
import id10778734.sceresini.week4.exercise3.tasks.Task;
import android.content.Context;
import android.util.AttributeSet;
import android.widget.ImageView;
import android.widget.LinearLayout;
import android.widget.TextView;
public class TaskListItem extends LinearLayout {
private Task mTask;
private ImageView mEmailImageView;
private ImageView mPriorityImageView;
private TextView mTaskNameTextView;
private TextView mTaskResponsibleTextView;
private ImageView mDeleteImageView;
public TaskListItem (Context context, AttributeSet attrs) {
super(context, attrs);
}
#Override
public void onFinishInflate() {
super.onFinishInflate();
mEmailImageView = (ImageView) findViewById(R.id.list_row_layout_email_button);
mPriorityImageView = (ImageView) findViewById(R.id.list_row_layout_priority_icon);
mTaskNameTextView = (TextView) findViewById(R.id.list_row_layout_task_name);
mTaskResponsibleTextView = (TextView) findViewById(R.id.list_row_layout_responsible);
mDeleteImageView = (ImageView) findViewById(R.id.list_row_layout_delete_button);
}
public void setTask (Task task) {
mTask = task;
mEmailImageView.setTag(task);
switch (task.getPriority()) {
case Constants.LOW:
mPriorityImageView.setImageResource(R.drawable.low);
break;
case Constants.MEDIUM:
mPriorityImageView.setImageResource(R.drawable.medium);
break;
case Constants.HIGH:
mPriorityImageView.setImageResource(R.drawable.high);
break;
}
mTaskNameTextView.setText(task.getName());
mTaskResponsibleTextView.setText(task.getResponsible());
mDeleteImageView.setTag(task);
}
public Task getTask () {
return mTask;
}
public ImageView getDeleteImageView () {
return mDeleteImageView;
}
public ImageView getEmailImageView () {
return mEmailImageView;
}
}
the custom layout xml file:
<?xml version="1.0" encoding="UTF-8"?>
<id10778734.sceresini.week4.exercise3.views.TaskListItem
xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:orientation="horizontal"
android:padding="5dip" >
<ImageView
android:id="#+id/list_row_layout_email_button"
android:layout_width="36dip"
android:layout_height="36dip"
android:layout_gravity="center_vertical"
android:layout_marginLeft="4dip"
android:layout_marginRight="5dip"
android:contentDescription="#string/list_row_email_icon_description"
android:src="#android:drawable/ic_dialog_email" />
<ImageView
android:id="#+id/list_row_layout_priority_icon"
android:layout_width="24dip"
android:layout_height="24dip"
android:layout_gravity="center_vertical"
android:layout_marginLeft="4dip"
android:layout_marginRight="10dip"
android:contentDescription="#string/view_task_priority_icon_description" />
<RelativeLayout
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:layout_gravity="center_vertical" >
<TextView
android:id="#+id/list_row_layout_task_name"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignParentLeft="true"
android:layout_centerVertical="true"
android:layout_toLeftOf="#+id/list_row_layout_responsible"
android:paddingRight="5dip"
android:textAppearance="#style/list_row_task_name" />
<TextView
android:id="#id/list_row_layout_responsible"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_centerVertical="true"
android:layout_toLeftOf="#+id/list_row_layout_delete_button"
android:maxWidth="100dip"
android:textAppearance="#style/list_row_task_responsible" />
<ImageView
android:id="#id/list_row_layout_delete_button"
android:layout_width="36dip"
android:layout_height="36dip"
android:layout_alignParentRight="true"
android:layout_centerVertical="true"
android:layout_marginLeft="5dip"
android:layout_marginRight="5dip"
android:contentDescription="#string/delete_task_icon_description"
android:src="#drawable/task_delete" />
</RelativeLayout>
</id10778734.sceresini.week4.exercise3.views.TaskListItem>
And the custom array adapter:
package id10778734.sceresini.week4.exercise3;
import id10778734.sceresini.week4.exercise3.R;
import id10778734.sceresini.week4.exercise3.tasks.Task;
import id10778734.sceresini.week4.exercise3.views.TaskListItem;
import java.util.ArrayList;
import android.app.AlertDialog;
import android.content.Context;
import android.content.DialogInterface;
import android.content.Intent;
import android.view.View;
import android.view.View.OnClickListener;
import android.view.ViewGroup;
import android.widget.BaseAdapter;
public class TaskListAdapter extends BaseAdapter
{
private ArrayList<Task> mTasks;
private Context mContext;
private AlertDialog unsavedChangesDialog;
private TaskManagerApplication mApp;
public TaskListAdapter(Context context, ArrayList<Task> tasks) {
super();
mApp = (TaskManagerApplication) context.getApplicationContext();
mContext = context;
mTasks = tasks;
}
#Override
public int getCount()
{
return mTasks.size();
}
#Override
public Task getItem(int position)
{
return (null == mTasks) ? null : mTasks.get(position);
}
#Override
public long getItemId(int position)
{
return position;
}
#Override
public View getView(int position, View convertView, ViewGroup parent)
{
TaskListItem tli;
if (null == convertView)
{
tli = (TaskListItem) View.inflate(mContext, R.layout.list_row_layout, null);
} else
{
tli = (TaskListItem) convertView;
}
tli.setTask(mTasks.get(position));
tli.getEmailImageView().setOnClickListener(new OnClickListener() {
#Override
public void onClick(View v)
{
emailTask(v);
}
});
tli.getDeleteImageView().setOnClickListener(new OnClickListener() {
#Override
public void onClick(View v)
{
deleteTask(v);
}
});
return tli;
}
/**
* deleteTask() prompts the user with an alert dialog and presents them with
* the option to continue with the delete request or to cancel the request.
* Upon confirmation, the selected Task object which is retrieved from the
* deleteTaskIcon tag, will be removed from the list of currentTasks.
*
* #param v
*/
protected void deleteTask(View v)
{
final Task t = (Task) v.getTag();
String alertMessage = String.format(mContext.getString(R.string.delete_task_message), t.getName());
unsavedChangesDialog = new AlertDialog.Builder(mContext).setTitle(R.string.delete_task_title).setMessage(alertMessage)
// Delete the task and refresh the adapter.
.setPositiveButton(R.string.delete_task_delete, new AlertDialog.OnClickListener() {
#Override
public void onClick(DialogInterface arg0, int arg1)
{
// Remove task from array list
mTasks.remove(t);
// Remove task from Database
mApp.deleteTask(t);
// Display toast message stating the task was deleted
mApp.displayToast(Constants.TASK_DELETED);
// Update listView with modified adapter
forceReload();
}
})
// Cancel the delete request and do nothing.
.setNegativeButton(R.string.delete_task_cancel, new AlertDialog.OnClickListener() {
#Override
public void onClick(DialogInterface arg0, int arg1)
{
unsavedChangesDialog.cancel();
}
}).create();
unsavedChangesDialog.show();
}
/**
* emailTask() populates the selected task into an intent which allows the
* user to select a client to send the task. This is formatted for email
* clients.
*
* #param v
*/
protected void emailTask(View v)
{
// Retrieve the task that is allocated to this RowView
final Task t = (Task) v.getTag();
// Instantiate the intent that will be used to call the email client
Intent emailIntent = new Intent(android.content.Intent.ACTION_SEND);
// Variables/Arrays to hold email attributes
String[] emailRecipients = { mContext.getString(R.string.email_task_to_email) };
String emailType = mContext.getString(R.string.email_task_type);
String emailTitle = mContext.getString(R.string.email_task_title);
String emailSubject = String.format(mContext.getString(R.string.email_task_subject), t.getName());
String emailMessage = String.format(mContext.getString(R.string.email_task_message), t.getResponsible(), t.getName(), mContext.getString(t.getPriorityStringId()));
// Add the email attributes to the intent
emailIntent.setType(emailType);
emailIntent.putExtra(android.content.Intent.EXTRA_EMAIL, emailRecipients);
emailIntent.putExtra(android.content.Intent.EXTRA_SUBJECT, emailSubject);
emailIntent.putExtra(android.content.Intent.EXTRA_TEXT, emailMessage);
// Start intent
mContext.startActivity(Intent.createChooser(emailIntent, emailTitle));
}
/**
* Refreshes the ListView with the modified dataset.
*/
public void forceReload()
{
notifyDataSetChanged();
}
}

Develop Reference

The Android operating system is a mobile operating system that was developed by Google (GOOGL?) to be primarily used for touchscreen devices, cell phones, and tablets.

Android ListView ViewHolder only displaying one view - android

This could be a problem android:layout_height="0dip" on your TimePicker. Change the height to wrap_content. Only the width needs to be 0dp when using weight.

Related

Addidng data to ListView by the own adapter [duplicate]

spinner initialization in a custom view

Android: ListView headers lost when scrolling

How to get values from dynamically created LinearLayout in android

Android custom listview row

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