I have a custom listView with three textViews. The data comes from a class with three ArrayLists, two of which are strings and the last one is an Integer. I have no problems populating and adding items to the list as I saw that when I displayed the ArrayList values on logCat via log.d, all three ArrayLists had their respectful items.
It seems to me that there is something wrong with the way I display data.
Here are the files:
list_row_layout.xml
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="match_parent"
android:layout_height="match_parent" >
<TextView
android:id="#+id/variant"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignParentLeft="true"
android:layout_alignParentTop="true"
android:text="variant" />
<TextView
android:id="#+id/quantity"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignParentRight="true"
android:layout_alignParentTop="true"
android:text="quantity" />
<TextView
android:id="#+id/unit"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignParentTop="true"
android:layout_marginRight="221dp"
android:layout_toLeftOf="#+id/quantity"
android:text="unit" />
</RelativeLayout>
Here is the part in my activity_order_form.xml that has the listView element.
<RelativeLayout
android:id="#+id/relativeLayout3"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignParentBottom="true"
android:layout_alignParentLeft="true"
android:layout_below="#+id/relativeLayout2"
android:orientation="vertical" >
<TextView
android:id="#+id/textViewVariantB"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_marginLeft="94dp"
android:text="Variant"
android:textAppearance="?android:attr/textAppearanceLarge" />
<TextView
android:id="#+id/textViewUnit"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignParentRight="true"
android:layout_alignParentTop="true"
android:layout_marginRight="123dp"
android:text="Unit"
android:textAppearance="?android:attr/textAppearanceLarge" />
<ListView
android:id="#+id/listViewProductOrder"
android:layout_width="match_parent"
android:layout_height="350dp"
android:layout_alignParentBottom="true"
android:layout_alignParentLeft="true"
android:layout_alignParentRight="true"
android:layout_below="#+id/textViewVariantB" >
</ListView>
</RelativeLayout>
Here is the class where the ArrayList are stored.
public class CurrentOrderClass {
private String productName;
//ArrayLists
private ArrayList<String> variantArray = new ArrayList<String>();
private ArrayList<String> unitArray = new ArrayList<String>();
private ArrayList<Integer> quantityArray = new ArrayList<Integer>();
//TODO ArrayList functions
public ArrayList<String> getUnitArray() {
return unitArray;
}
public void setUnitArray(ArrayList<String> unitArray) {
this.unitArray = unitArray;
}
public void addToUnitArray(String unit){
this.unitArray.add(unit);
}
public ArrayList<Integer> getQuantityArray() {
return quantityArray;
}
public void setQuantityArray(ArrayList<Integer> quantityArray) {
this.quantityArray = quantityArray;
}
public void addToQuantityArray(int quantity){
this.quantityArray.add(quantity);
}
public ArrayList<String> getVariantArray() {
return variantArray;
}
public void setVariantArray(ArrayList<String> variantArray) {
this.variantArray = variantArray;
}
public void addToVariantArray(String variantArray){
this.variantArray.add(variantArray);
}
}
Here is the CustomListAdapter.java file
public class CustomListAdapter extends BaseAdapter {
private ArrayList<CurrentOrderClass> listData;
private LayoutInflater layoutInflater;
public CustomListAdapter(Context context, ArrayList<CurrentOrderClass> listData) {
this.listData = listData;
layoutInflater = LayoutInflater.from(context);
}
#Override
public int getCount() {
return listData.size();
}
#Override
public Object getItem(int position) {
return listData.get(position);
}
#Override
public long getItemId(int position) {
return position;
}
public View getView(int position, View convertView, ViewGroup parent) {
ViewHolder holder;
if (convertView == null) {
convertView = layoutInflater.inflate(R.layout.list_row_layout, null);
holder = new ViewHolder();
holder.variantView = (TextView) convertView.findViewById(R.id.variant);
holder.unitView = (TextView) convertView.findViewById(R.id.unit);
holder.quantityView = (TextView) convertView.findViewById(R.id.quantity);
convertView.setTag(holder);
} else {
holder = (ViewHolder) convertView.getTag();
}
holder.variantView.setText(listData.get(position).getVariantArray().get(position).toString());
holder.unitView.setText(listData.get(position).getUnitArray().get(position).toString());
holder.quantityView.setText(String.valueOf(listData.get(position).getQuantityRow()));
return convertView;
}
static class ViewHolder {
TextView variantView;
TextView unitView;
TextView quantityView;
}
public void setListData(ArrayList<CurrentOrderClass> data){
listData = data;
}
}
This is part of my OrderForm.java activity, this shows the onCreate and the method that populates the listView.
public class OrderForm extends Activity {
public TextView tv;
private int variantPosition;
CustomListAdapter customListAdapter;
CurrentOrderClass currentOrder = new CurrentOrderClass();
#Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_order_form);
tv = (TextView)findViewById(R.id.textViewProduct);
//set variants here
popolateItem();
//set current order listview here
ArrayList image_details = getListData();
final ListView lv1 = (ListView) findViewById(R.id.listViewProductOrder);
customListAdapter = new CustomListAdapter(this, image_details);
lv1.setAdapter(customListAdapter);
}
private ArrayList getListData() {
ArrayList results = new ArrayList();
if(currentOrder.getQuantityArray().size() > 10){
loopUntil = currentOrder.getQuantityArray().size();
for(int i = 0; i < loopUntil; i++){
currentOrder.getQuantityArray();
currentOrder.getUnitArray();
currentOrder.getVariantArray();
results.add(currentOrder);
}
}
else{
loopUntil = 10;
for(int i = 0; i < loopUntil; i++){
currentOrder.getQuantityArray().add(i);
currentOrder.getUnitArray().add("Sample text here." + i);
currentOrder.getVariantArray().add("Another sample text here" + i);
results.add(currentOrder);
}
}
return results;
}
}
When I execute a Log.d statement to display the contents of my ArrayLists, it shows that my quantityArray has elements [0, 1, 2, 3, 4, 5, 6, 7, 9].
I know I can just convert quantityArray to an ArrayList from an ArayList, but I don't want to do that.
I think there's something wrong with my CustomListAdapter.
Any thoughts?
There is no where that you actually set the view, as in, it doesn't do anything, if convertView is null, you can't call any methods of it, convertView, if its is not null, will be ViewHolder in your context, what you need to do is have an object which is extending some type of view, instantiate it, give it methods to set the values, things like that.
For example here is what I use in an adapter that displays simple messages:
public class MessageView extends RelativeLayout {
private TextView mBody;
private String mBodyString = "";
private boolean mDrawn = false;
private boolean mLocal = false;
public MessageView(Context context) {
super(context);
this.drawView();
}
public MessageView(Context context, String body) {
super(context);
mBodyString = body;
this.drawView();
}
public MessageView(Context context, String body, boolean local) {
super(context);
mBodyString = body;
mLocal = local;
this.drawView();
}
private void drawView() {
if (mDrawn)
return;
mDrawn = true;
this.removeAllViews();
LayoutInflater li = (LayoutInflater) this.getContext()
.getSystemService(Context.LAYOUT_INFLATER_SERVICE);
RelativeLayout.LayoutParams params = new RelativeLayout.LayoutParams(
LayoutParams.MATCH_PARENT, LayoutParams.WRAP_CONTENT);
params.addRule(RelativeLayout.ALIGN_PARENT_TOP);
if(mLocal){
this.addView(li.inflate(R.layout.list_item_message_device, this, false),
params);
}else{
this.addView(li.inflate(R.layout.list_item_message_remote, this, false),
params);
}
mBody = (TextView) this.findViewById(R.id.tMessage);
mBody.setText(mBodyString);
}
public void setLocal(){
this.setLocal(true);
}
public void setLocal(boolean local){
mLocal = local;
mDrawn = false;
this.drawView();
}
public void setMessage(String body){
mBodyString = body;
mBody.setText(mBodyString);
}
}
I got it.
I changed
holder.quantityView.setText(String.valueOf(listData.get(position).getQuantityRow()));
to
holder.quantityView.setText(String.valueOf(listData.get(position).getQuantityArray().get(position)));
Related
I am coding a listView that gets the data from mySQL Server.
I have created the followings classes.
Class ListView. It has two contractors all in Strings. And I sat getters and setters.
I believe I have a problem with the Adapter its self. I can click on more than one option. While I have created the custom adapter in the layout as the followings:
<RadioGroup
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:id="#+id/RG_Adapter"
android:layoutDirection="rtl"
android:orientation="horizontal">
<RadioButton
android:id="#+id/TRIP_NAME"
android:layout_width="0dp"
android:layout_height="match_parent"
android:layout_weight="3"
android:textAlignment="center"
android:textSize="25sp"
android:textColor="#000000"
/>
<TextView
android:id="#+id/SUM_TRIPS"
android:layout_width="0dp"
android:layout_height="match_parent"
android:layout_weight="1"
android:textColor="#000000"
android:textAlignment="center"
android:textSize="25sp" />
</RadioGroup>
I believe my problem is with the Adapter class.
I have created it like the followings:
public class TRIPS_LISTVIEW_ADAPTER extends ArrayAdapter<TRIPS_LISTVIEW> {
private Context mContext;
private ArrayList<TRIPS_LISTVIEW> mData;
private MyFunctionsClass myFunctionsClass = new MyFunctionsClass();
public TRIPS_LISTVIEW_ADAPTER (Context mContext, ArrayList<TRIPS_LISTVIEW> mData) {
super(mContext, R.layout.summary_shape_layout,mData);
this.mContext = mContext;
this.mData = mData;
}
public int getCount() {
return mData.size();
}
#Override
public long getItemId(int position) {
return position;
}
#Override
public View getView(final int position, View convertView, ViewGroup parent)
{
if (convertView == null)
{
LayoutInflater mInflater = (LayoutInflater)
mContext.getSystemService(Activity.LAYOUT_INFLATER_SERVICE);
convertView = mInflater.inflate(R.layout.summary_shape_layout, null);
}
RadioGroup RG = (RadioGroup) convertView.findViewById(R.id.RG_Adapter);
TextView TRIP_NAME = (TextView) convertView.findViewById(R.id.TRIP_NAME);
TRIP_NAME.setTypeface(myFunctionsClass.FONT( TRIP_NAME.getContext().getAssets(),1));
TRIP_NAME.setText(myFunctionsClass.get_The_trip(mData.get(position).getTRIP_TITLE()));
TextView SUM_TRIPS = (TextView) convertView.findViewById(R.id.SUM_TRIPS);
SUM_TRIPS.setTypeface(myFunctionsClass.FONT( SUM_TRIPS.getContext().getAssets(),1));
SUM_TRIPS.setText(mData.get(position).getTRIP_COUNT());
return convertView;
}
}
The Data in my MainActivity Class are retrieved correctly. But as I mentioned I have multiple mode selection.
Try the following:
1) Demo2.class:-------------
public class Demo2 extends AppCompatActivity {
private ListView lv;
private CheckBox cb;
private Adapter adapter;
private List<Boolean> checkBoxState;
private List<String> checkBoxText;
#Override
protected void onCreate(#Nullable Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.demo2);
checkBoxState = new ArrayList<>();
checkBoxText = new ArrayList<>();
for(int i = 0 ; i<10 ; i++){
if(i == 0) {
checkBoxState.add(i, true);
}else{
checkBoxState.add(i , false);
}
checkBoxText.add( i , "C" + (i+1));
}
lv = (ListView) findViewById(R.id.lv);
adapter = new Adapter(getApplicationContext() , checkBoxState , checkBoxText);
lv.setAdapter(adapter);
}
}
2) Adapter.class:------
public class Adapter extends BaseAdapter {
private Context context;
private LayoutInflater layoutInflater;
private List<Boolean> checkBoxState;
private List<String> checkBoxText;
public Adapter(Context context, List<Boolean> checkBoxState , List<String> checkBoxText) {
this.context = context;
layoutInflater = LayoutInflater.from(context);
this.checkBoxState = checkBoxState;
this.checkBoxText = checkBoxText;
}
public int getCount() {
return checkBoxState.size();
}
public Object getItem(int position) {
return checkBoxState.get(position);
}
public long getItemId(int position) {
return position;
}
public View getView(final int position, View convertView, ViewGroup parent) {
View view = convertView;
final CheckBox cb_list_item;
if (convertView == null) {
if (layoutInflater != null) {
view = layoutInflater.inflate(R.layout.list_item, null);
}
}
cb_list_item = (CheckBox) view.findViewById(R.id.cb_list_item);
cb_list_item.setText(checkBoxText.get(position));
cb_list_item.setOnCheckedChangeListener(null); // mask onCheckedChangeListener()
cb_list_item.setChecked(checkBoxState.get(position));
cb_list_item.setOnCheckedChangeListener(new CompoundButton.OnCheckedChangeListener() {
#Override
public void onCheckedChanged(CompoundButton compoundButton, boolean b) {
if (!b) { // already selected
compoundButton.setChecked(true);
} else { // is selected now
checkSelected(position);
}
}
});
return view;
}
private void checkSelected(int position){
try {
for (int i = 0; i < checkBoxState.size(); i++) {
checkBoxState.set(i, false);
}
checkBoxState.set(position, true);
this.notifyDataSetChanged();
}catch (Exception e){
e.printStackTrace();
}
}
}
3) demo2.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:weightSum="100"
android:orientation="vertical">
<ListView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:id="#+id/lv"
android:layout_marginStart="10dp"
android:layout_marginEnd="10dp"
android:layout_marginTop="10dp"
android:layout_marginBottom="10dp">
</ListView>
</LinearLayout>
4) list_item.xml:----------
<?xml version="1.0" encoding="utf-8"?>
<android.support.constraint.ConstraintLayout
xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="match_parent"
android:layout_height="match_parent">
<CheckBox
android:layout_width="match_parent"
android:layout_height="match_parent"
android:text="C"
android:layout_marginStart="10dp"
android:layout_marginEnd="10dp"
android:layout_marginTop="10dp"
android:layout_marginBottom="10dp"
android:id="#+id/cb_list_item"/>
</android.support.constraint.ConstraintLayout>
5) Output:--------
There are 3 textviews and 1 button in my listview.One of textview contains time.I want button must get clicked after 20mins of intime.I want to compare Intime with current time and if difference >20 mins then button must get clicked.Following is my code-
MainActivity.java
public class MainActivity extends Activity {
TextView txtno,txtname,txtintime;
ListView listView;
ArrayList<Model> data;
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
txtno=(TextView)findViewById(R.id.no);
txtname=(TextView)findViewById(R.id.name);
txtintime=(TextView)findViewById(R.id.intime);
listView = (ListView) findViewById(R.id.list);
data=new ArrayList<>();
data.add(new Model(1,"ABC","11:45:50 AM"));
data.add(new Model(2,"PQR","11:50:50 AM"));
data.add(new Model(1,"XyZ","12:45:50 PM"));
data.add(new Model(1,"SHjhsj","04:45:50 PM"));
Custom c=new Custom(this,data);
listView.setAdapter(c);
}
}
Model.java
public class Model {
int no;
String name,intime;
public Model(int no, String name, String intime) {
this.no = no;
this.name = name;
this.intime = intime;
}
public int getNo() {
return no;
}
public void setNo(int no) {
this.no = no;
}
public String getName() {
return name;
}
public void setName(String name) {
this.name = name;
}
public String getIntime() {
return intime;
}
public void setIntime(String intime) {
this.intime = intime;
}
}
Custom.java
public class Custom extends BaseAdapter {
Activity a;
ArrayList<Model> data;
public Custom(Activity a, ArrayList<Model> data) {
this.a = a;
this.data = data;
}
#Override
public int getCount() {
return data.size();
}
#Override
public Object getItem(int i) {
return data.get(i);
}
#Override
public long getItemId(int i) {
return i;
}
public class Viewholder {
TextView srno, name, intime;
Button end;
}
#Override
public View getView(final int i, View convertView, ViewGroup viewGroup) {
Viewholder viewholder = null;
if (convertView == null) {
viewholder = new Viewholder();
LayoutInflater li = a.getLayoutInflater();
convertView = li.inflate(R.layout.list_item, viewGroup, false);
viewholder.srno = (TextView) convertView.findViewById(R.id.cno);
viewholder.name = (TextView) convertView.findViewById(R.id.cname);
viewholder.intime = (TextView) convertView.findViewById(R.id.ctime);
viewholder.end = (Button) convertView.findViewById(R.id.cend);
convertView.setTag(viewholder);
}else {
viewholder=(Viewholder)convertView.getTag();
}
final Model model = data.get(i);
viewholder.srno.setText(valueOf(data.get(i).getNo()));
viewholder.name.setText(valueOf(data.get(i).getName()));
viewholder.intime.setText(valueOf(data.get(i).getIntime()));
viewholder.end.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View view) {
Toast.makeText(a, data.get(i).getName()+" Exited", Toast.LENGTH_LONG).show();
}
});
return convertView;
}
}
activity_main.xml
<?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:orientation="horizontal"
tools:context="com.example.abc.timer.MainActivity">
<TextView
android:layout_width="70dp"
android:layout_height="50dp"
android:id="#+id/no"
android:text="CustNo"
android:textSize="20dp"
android:textColor="#000"/>
<TextView
android:layout_width="80dp"
android:layout_height="50dp"
android:id="#+id/name"
android:layout_toRightOf="#+id/no"
android:text="Name"
android:textSize="20dp"
android:textColor="#000"/>
<TextView
android:layout_width="80dp"
android:layout_height="50dp"
android:id="#+id/intime"
android:layout_toRightOf="#+id/name"
android:text="InTime"
android:textSize="20dp"
android:textColor="#000"/>
<TextView
android:layout_width="70dp"
android:layout_height="50dp"
android:id="#+id/exit"
android:text="Exit"
android:layout_toRightOf="#+id/intime"
android:textSize="20dp"
android:textColor="#000"/>
<ListView
android:layout_width="match_parent"
android:layout_height="400dp"
android:layout_below="#+id/no"
android:id="#+id/list"
></ListView>
</RelativeLayout>
list_item.xml
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:orientation="horizontal" android:layout_width="match_parent"
android:layout_height="match_parent">
<TextView
android:layout_width="70dp"
android:layout_height="match_parent"
android:id="#+id/cno"
android:gravity="center"/>
<TextView
android:layout_width="70dp"
android:layout_height="match_parent"
android:id="#+id/cname"
android:gravity="center"/>
<TextView
android:layout_width="80dp"
android:layout_height="match_parent"
android:id="#+id/ctime"
android:gravity="center"/>
<Button
android:layout_width="90dp"
android:layout_height="40dp"
android:text="End"
android:id="#+id/cend"
android:background="#c14c4a"
android:gravity="center"/>
</LinearLayout>
Use an AlarmManager with your specified time and the moment alarm will trigger you can enable the button, hence enabling the click event for the button.
Edit:
Either you can go ahead with handler object and use handler.postDelayed() method or there itself you can create a Timer Object and schedule the timer task within that object and do the stuff.
Assuming that u know how to convert the time strings into timestamps,modify ur adapter like this:
public class Custom extends BaseAdapter {
Activity a;
ArrayList<Model> data;
public Custom(Activity a, ArrayList<Model> data) {
this.a = a;
this.data = data;
}
#Override
public int getCount() {
return data.size();
}
#Override
public Object getItem(int i) {
return data.get(i);
}
#Override
public long getItemId(int i) {
return i;
}
public class Viewholder {
TextView srno, name, intime;
Button end;
}
#Override
public View getView(final int i, View convertView, ViewGroup viewGroup) {
Viewholder viewholder = null;
if (convertView == null) {
viewholder = new Viewholder();
LayoutInflater li = a.getLayoutInflater();
convertView = li.inflate(R.layout.list_item, viewGroup, false);
viewholder.srno = (TextView) convertView.findViewById(R.id.cno);
viewholder.name = (TextView) convertView.findViewById(R.id.cname);
viewholder.intime = (TextView) convertView.findViewById(R.id.ctime);
viewholder.end = (Button) convertView.findViewById(R.id.cend);
convertView.setTag(viewholder);
}else {
viewholder=(Viewholder)convertView.getTag();
}
final Model model = data.get(i);
viewholder.srno.setText(valueOf(data.get(i).getNo()));
viewholder.name.setText(valueOf(data.get(i).getName()));
viewholder.intime.setText(valueOf(data.get(i).getIntime()));
final Runnable r = new Runnable() {
public void run() {
viewholder.end.setEnabled(true);
}
};
if(yourObjectTimestamp - currentTimeStamp > 20){ //this u need to do on ur own
viewholder.end.setEnabled(true); // I assumed u know how to convert times to timestamps
}else{
viewholder.end.setEnabled(false);
long timeDiffInMillis = yourObjectTimestamp - currentTimeStamp;
handler.postDelayed(r,timeDiffInMillis );
}
viewholder.end.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View view) {
Toast.makeText(a, data.get(i).getName()+" Exited", Toast.LENGTH_LONG).show();
}
});
return convertView;
}
}
I'm new to Asynctask and JSon.
May i know how to start to retrieve the currency rates from this site?
http://api.fixer.io/latest?base=SGD
I did look at this post but i'm not too sure how to start..
AsyncTask Android example
From the rates retrieved, i'd like to add the values into this ListView, by using a custom ListView adapter class.
Codes for xml file
<LinearLayout
android:layout_width="match_parent"
android:layout_height="0.0dp"
android:orientation="horizontal"
android:layout_weight="0.4"
android:weightSum="1" >
<LinearLayout
android:layout_width="0.0dp"
android:layout_height="match_parent"
android:orientation="vertical"
android:layout_weight="0.8" >
<TextView
android:id="#+id/convertedAmtTV"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:text="0.00"
android:textSize="70dp"
android:gravity="right" />
<EditText
android:id="#+id/inputAmtET"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:text="0"
android:textAlignment="textEnd" />
</LinearLayout>
<LinearLayout
android:layout_width="0.0dp"
android:layout_height="match_parent"
android:orientation="vertical"
android:layout_weight="0.2">
<TextView
android:id="#+id/convertedCurrTV"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:text="SGD"
android:textSize="28dp"
android:paddingLeft="2dp"
android:paddingTop="29dp"
android:paddingBottom="19dp"
android:gravity="center_horizontal" />
<TextView
android:id="#+id/inputCurrTV"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:text="AUD"
android:textSize="28dp"
android:paddingLeft="2dp"
android:layout_marginTop="3dp"
android:gravity="center_horizontal" />
</LinearLayout>
</LinearLayout>
<LinearLayout
android:orientation="vertical"
android:layout_weight="0.6"
android:layout_width="match_parent"
android:layout_height="0.0dp">
<TextView
android:text="From"
android:textSize="21dp"
android:layout_width="match_parent"
android:layout_height="wrap_content" />
<ListView
android:id="#+id/currencyLV"
android:layout_width="match_parent"
android:layout_height="wrap_content" />
</LinearLayout>
Codes for MainActivity.class
public class MainActivity extends AppCompatActivity {
CurrencyRatesDetails crd = new CurrencyRatesDetails();
CurrencyRates cr = new CurrencyRates();
TextView inputCurrTV, convertedAmtTV;
ListView currencyLV;
EditText inputAmtET;
ArrayAdapter<String> adapter;
String[] currNameArr = crd.getNames();
String[] currCodeArr = crd.getCodes();
String[] currRateArr = crd.getRates();
String[] dbName;
String[] dbCode;
String[] dbRate;
Context context;
int index = 0;
//String[] rateCurrArr = {"AUD", "BGN", "BRL", "CAD", "CHF", "CNY"};
//double[] rateArr = {0.944, 1.2824, 2.2842, 0.96158, 0.70946, 4.8624}
Menu myMenu = null;
double amtInput, finalConversion;
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
context = this;
//context.deleteDatabase("currency.db");
inputAmtET = (EditText) findViewById(R.id.inputAmtET);
convertedAmtTV = (TextView) findViewById(R.id.convertedAmtTV);
inputCurrTV = (TextView) findViewById(R.id.inputCurrTV);
currencyLV = (ListView) findViewById(R.id.currencyLV);
/*for (int i = 0; i < currNameArr.length; i++) {
cr.addToDataBase(currNameArr[i], currCodeArr[i], currRateArr[i], getApplicationContext());
}*/
//cr.addToDataBase(currNameArr, getApplicationContext());
//Resources myRes = this.getResources();
//currArr = myRes.getStringArray(R.array.currencyList);
//adapter = ArrayAdapter.createFromResource(this, R.array.currencyList, android.R.layout.simple_selectable_list_item);
//adapter = new ArrayAdapter<String>(this, android.R.layout.simple_selectable_list_item, currNameArr);
//currencyLV.setAdapter(adapter);
dbName = cr.retrieveAllName(getApplicationContext());
dbCode = cr.retrieveAllCode(getApplicationContext());
dbRate = cr.retrieveAllRate(getApplicationContext());
currencyLV.setAdapter(new CustomAdapter(this, dbName, dbCode, dbRate));
currencyLV.setOnItemClickListener(new AdapterView.OnItemClickListener() {
#Override
public void onItemClick(AdapterView<?> adapterView, View view, int i, long l) {
inputCurrTV.setText(dbCode[i]);
index = i;
//Getting rate based on selected currency code
//rate = rateArr[i];
}
});
}
public boolean onCreateOptionsMenu(Menu menu) {
super.onCreateOptionsMenu(menu);
this.myMenu = menu;
addMenuItems(menu);
getMenuInflater().inflate(R.menu.mainmenu, menu);
return true;
}
private void addMenuItems(Menu menu) {
int index = 200;
menu.add(index, index, index, "Settings");
menu.add(index, index + 1, index + 1, "Add Custom Rate");
menu.add(index, index + 2, index + 2, "Load Default Rates");
}
public boolean onOptionsItemSelected(MenuItem item) {
//getOrder() to get Menu Item at this specific orderId
if (item.getItemId() == R.id.menu_convert) {
amtInput = Double.parseDouble(inputAmtET.getText().toString());
//finalConversion = amtInput / rate;
finalConversion = crd.conversion(amtInput, index);
//Formatting converted value to 2d.p
String finalValue = String.format("%.2f", finalConversion);
convertedAmtTV.setText(finalValue);
} else if (item.getItemId() == 201) {
Intent myIntent = new Intent(MainActivity.this, CustomXchangeRate.class);
startActivity(myIntent);
}
return true;
}
}
Custom ListView Adapter Class
public class CustomAdapter extends BaseAdapter{
String[] resultNames;
String[] resultCodes;
String[] resultRates;
Context context;
private static LayoutInflater inflater = null;
public CustomAdapter(CustomXchangeRate customXchangeRate, String[] names, String[] codes, String[] rates) {
resultNames = names;
resultCodes = codes;
resultRates = rates;
context = customXchangeRate;
inflater = (LayoutInflater) context.getSystemService(Context.LAYOUT_INFLATER_SERVICE);
}
public CustomAdapter(MainActivity mainActivity, String[] names, String[] codes, String[] rates) {
resultNames = names;
resultCodes = codes;
resultRates = rates;
context = mainActivity;
inflater = (LayoutInflater) context.getSystemService(Context.LAYOUT_INFLATER_SERVICE);
}
#Override
public int getCount() {
return resultNames.length;
}
#Override
public Object getItem(int position) {
return position;
}
#Override
public long getItemId(int position) {
return position;
}
public class ViewHolder{
TextView tvName;
TextView tvCode;
TextView tvRate;
}
#Override
public View getView(final int position, View convertView, ViewGroup parent) {
ViewHolder vh = new ViewHolder();
View rowView;
rowView = inflater.inflate(R.layout.activity_custom_adapter, null);
vh.tvName = (TextView) rowView.findViewById(R.id.currencyNameTV);
vh.tvCode = (TextView) rowView.findViewById(R.id.currencyCodeTV);
vh.tvRate = (TextView) rowView.findViewById(R.id.currencyRateTV);
vh.tvName.setText(resultNames[position]);
vh.tvCode.setText(resultCodes[position]);
vh.tvRate.setText(resultRates[position]);
return rowView;
}
}
Would appreciate any help...
The best way to get this JSON inside ur app will be to use Volley :
https://developer.android.com/training/volley/simple.html
Check this link you will find what ur asking for.
Cheers
I have a custom row item xml and a Activity xml which has a button, a textbox and a listview. Can anybody give me a very simple example on how this is done? I know i will need a adapter (what it extends i dont know) and update it from the button
I have tried getting the list view updated from the button with the editview text but cant get the adapter code to be hit. I am looking at base adapters now but cant help but feel this shouldn't be complicated and need so many override methods.
Activity class
public class InvitePlayers_Activity extends Activity {
ListViewAdapter emailAdapter = null;
ImageView imgView_mail;
ImageView imgView_confirm;
#Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
this.requestWindowFeature(Window.FEATURE_NO_TITLE); //remove title bar
setContentView(R.layout.activity_inviteplayers);
//Generate list View from ArrayList
displayListView();
}
private void displayListView() {
//assign controls
final ListView listView = (ListView) findViewById(R.id.listView_invitePlayers);
imgView_mail = (ImageView)findViewById(R.id.imgView_mail);
//Test data
ArrayList<String> inviteNew = new ArrayList<String>();
final ArrayList<ArrayList<String>> inviteList = new ArrayList<ArrayList<String>>();
emailAdapter = new ListViewAdapter(this,inviteList);
listView.setAdapter(emailAdapter);
// Assign adapter to ListView
listView.setTextFilterEnabled(true);
//Edit listeners
imgView_mail.setOnClickListener(new View.OnClickListener() {
public void onClick(View view)
{
//variables
final String enteredMail = "testListViewEntry";
final ArrayList<ArrayList<String>> inviteList = new ArrayList<ArrayList<String>>();
ArrayList<String> invite = new ArrayList<String>();
invite.add(0, enteredMail);//add first email
invite.add(1,"icon_invitestatussent.png"); //add first status icon
inviteList.add(invite);
emailAdapter.notifyDataSetChanged();
listView.setAdapter(emailAdapter);
}
});
}
}
Adapter class
public class ListViewAdapter extends BaseAdapter {
private Activity context;
ArrayList<ArrayList<String>> inviteDetails = new ArrayList<ArrayList<String>>();
public ListViewAdapter(Activity context, ArrayList<ArrayList<String>> inviteDetails ) {
this.inviteDetails = inviteDetails;
this.context = context;
}
#Override
public int getCount() {
return 0;
}
#Override
public Object getItem(int i) {
return null;
}
#Override
public long getItemId(int i) {
return 0;
}
public View getView(int position, View view, ViewGroup parent){
//Inflater
LayoutInflater inflater = context.getLayoutInflater();
//get row view
if (view == null) {
LayoutInflater mInflater = (LayoutInflater)
context.getSystemService(Activity.LAYOUT_INFLATER_SERVICE);
view = mInflater.inflate(R.layout.list_item_email, null);
}
//assign controls
final TextView textView_playerEmail = (TextView) view.findViewById(R.id.textView_playerEmail);
ImageView imgView_inviteStatus = (ImageView) view.findViewById(R.id.imgView_inviteStatus);
//Assign control values that are dynamic
textView_playerEmail.setText(inviteDetails.get(position).get(0));
imgView_inviteStatus.setImageResource(R.drawable.icon_invitestatussent);
return view;
}
public ArrayList<ArrayList<String>> addInvite(ArrayList<String> inviteDetails, ArrayList<ArrayList<String>> currentInvites)
{
currentInvites.add(inviteDetails);
return currentInvites;
}
#Override
public void notifyDataSetChanged() {
super.notifyDataSetChanged();
}
}
Custom row xml
<TextView xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="fill_parent"
android:layout_height="fill_parent"
android:padding="10dp"
android:textSize="16sp"
android:id="#+id/textView_playerEmail"
android:textColor="#color/white"
android:text="item1">
</TextView>
<ImageView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:id="#+id/imgView_inviteStatus" />
<ImageView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:id="#+id/imgView_remove"
android:src="#drawable/btn_cancel" />
Activity layout
<LinearLayout
android:orientation="horizontal"
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:weightSum="1"
android:gravity="left|center">
<ImageView
android:layout_width="45dp"
android:layout_height="34dp"
android:id="#+id/imgView_mail"
android:src="#drawable/btn_mail"
android:layout_weight="0.22"
android:padding="3dp" />
</LinearLayout>
<ListView
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:id="#+id/listView_invitePlayers"
android:layout_gravity="center_horizontal" />
</LinearLayout>
<ImageView
android:layout_width="80dp"
android:layout_height="80dp"
android:id="#+id/btn_confirm"
android:src="#drawable/btn_confirm"
android:clickable="false"
android:adjustViewBounds="true"
android:layout_gravity="center_horizontal"
android:padding="2dp"
android:layout_weight="1" />
</LinearLayout>
From reading the description of the question I think you need to set custom adapter to show the elements in you listview. This is how you set the custom adapter for the listview:
public class Notes_list extends BaseAdapter
{
private Context mContext;
private ArrayList<String> id;
private ArrayList<String> firstName;
private ArrayList<String> lastName;
public Notes_list(Context c, ArrayList<String> id,ArrayList<String> fname, ArrayList<String> lname)
{
this.mContext = c;
this.id = id;
this.firstName = fname;
this.lastName = lname;
}
public int getCount() {
return id.size();
}
public Object getItem(int position) {
return null;
}
public long getItemId(int position) {
return 0;
}
#Override
public View getView(int pos, View child, ViewGroup arg2) {
Holder mHolder;
LayoutInflater layoutInflater;
if (child == null) {
layoutInflater = (LayoutInflater) mContext.getSystemService(Context.LAYOUT_INFLATER_SERVICE);
child = layoutInflater.inflate(R.layout.custom_row, null);
mHolder = new Holder();
// mHolder.txt_id = (TextView) child.findViewById(R.id.txt_id);
mHolder.txt_fName = (TextView) child.findViewById(R.id.txt_fName);
mHolder.txt_lName = (TextView) child.findViewById(R.id.txt_lName);
child.setTag(mHolder);
} else
{
mHolder = (Holder) child.getTag();
}
// mHolder.txt_id.setText(id.get(pos));
mHolder.txt_fName.setText(firstName.get(pos));
mHolder.txt_lName.setText(lastName.get(pos));
return child;
}
public class Holder
{
// TextView txt_id;
TextView txt_fName;
TextView txt_lName;
}
}
now in your main activity where you have to call the list enter code like this:
private ListView userList;
private ArrayList<Employee> itemsList = new ArrayList<modelName>();
userList = (ListView) findViewById(R.id.List);
UserList disadpt = new UserList(MainActivity.this, itemsList);
userList.setAdapter(disadpt);
Hope it helps...
I have a donorview class which extends linearlayout which is as follows:
public class donorview extends LinearLayout {
private TextView donortext;
private String donorstr;
private ImageButton call;
private ImageButton msg;
private String donornumber;
private Context context1;
private View convertView;
public donorview(Context context, String donorname1, String donornum) {
super(context);
context1 = context;
// TODO Auto-generated constructor stub
LayoutInflater inflater = (LayoutInflater) context
.getSystemService(Context.LAYOUT_INFLATER_SERVICE);
convertView = inflater.inflate(R.layout.listformat, null);
convertView.setClickable(true);
donortext = (TextView) findViewById(R.id.donornametext);
call = (ImageButton) findViewById(R.id.call);
msg = (ImageButton) findViewById(R.id.msg);
System.out.println("donorname:"+donorname1);
System.out.println("donornum:"+donornum);
donortext.setText(donorname1);
System.out.println("after setting text");
donorstr = donorname1;
donornumber = donornum;
}
void onClickCall(){
Intent callIntent = new Intent(Intent.ACTION_CALL);
callIntent.setData(Uri.parse("tel:" + donornumber));
convertView.getContext().startActivity(callIntent);
}
public void setdonorname(String donorname12) {
donortext.setText(donorname12);
}
public String getdonorname() {
return this.donorstr;
}
}
I get a NullPoinerException as
java.lang.NullPonintereException
at com.wglxy.example.dash1.donorview.<init>(donorview.java:35)
while setting the text of the textview donortext. My XML layout of the listformat is
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout android:id="#+id/linerlayout1"
android:layout_width="fill_parent" android:layout_height="wrap_content"
android:orientation="horizontal">
<TextView android:id="#+id/donornametext" android:layout_height="wrap_content"
android:layout_width="wrap_content" android:layout_weight="1" android:text="a"/>
<ImageButton android:layout_width="wrap_content" android:id="#+id/call"
android:layout_height="wrap_content" android:contentDescription="#string/description_about"
android:src="#drawable/call" android:onClick="onClickCall"
android:background="#ffffff" />
<ImageButton android:layout_width="wrap_content" android:id="#+id/msg"
android:layout_height="wrap_content" android:contentDescription="#string/description_about"
android:src="#drawable/msg" android:onClick="onClickMsg"
android:background="#ffffff" />
</LinearLayout>
I dont understand what I am doing wrong. The list that is being displayed is empty. When i am printing the donorname and donornum it is being printed but the custom list displayed is empty.I have been trying to figure it out from a long time. Could anyone please help me with this?
My adapter code is as follows
public class donorAdapter extends BaseAdapter {
private Activity activity;
ArrayList<String> names = new ArrayList<String>();
ArrayList<String> nums = new ArrayList<String>();
private Context context;
private String strnum;
private String strname;
private static LayoutInflater inflater = null;
public donorAdapter(Context context, Activity a, ArrayList<String> names,
ArrayList<String> nums) {
this.context = context;
activity = a;
this.names = names;
this.nums = nums;
inflater = LayoutInflater.from(activity);
}
public int getCount() {
return names.size();
}
public Object getItem(int position) {
return position;
}
public long getItemId(int position) {
return position;
}
public View getView(int position, View convertView, ViewGroup parent) {
donorview fv;
if (convertView == null) {
System.out.println("inside getview:"+names.get(position).toString());
strname=names.get(position).toString();
strnum=nums.get(position).toString();
System.out.println("inside getview:"+nums.get(position).toString());
fv = new donorview(context, strname,strnum);
convertView = fv;
}
else {
((donorview) convertView).setdonorname(names.get(position)
.toString());
}
convertView.setClickable(true);
convertView.setFocusable(true);
return convertView;
}
}
-Thanks in advance
You should use
donortext = (TextView)convertView.findViewById(R.id.donornametext);
and also replace your code by
convertView = inflater.inflate(R.layout.listformat, this);
Replace
findViewById
with
convertView.findViewById()
you use findViewById, when you have already set the content for the activity, in your case you did not , so you have to specify which view it has to look to get the id. You have to do the same for the rest of your views.