I am using a custom list view through the following code
public class details extends ListActivity {
/** Called when the activity is first created. */
Bundle extras;
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.custom_list_view);
extras=getIntent().getExtras();
SimpleAdapter adapter = new SimpleAdapter(
this,
list,
R.layout.custom_row_view,
new String[] {"name","use"},
new int[] {R.id.text1,R.id.text2}
);
populateList();
setListAdapter(adapter);
}
static final ArrayList<HashMap<String,String>> list =
new ArrayList<HashMap<String,String>>();
private void populateList()
{
HashMap<String,String> temp1 = new HashMap<String,String>();
temp1.put("name","NAME");
temp1.put("use",extras.getString("name"));
list.add(temp1);
HashMap<String,String> temp2 = new HashMap<String,String>();
temp2.put("name","CHANGE IN PRICE");
temp2.put("use",extras.getString("change"));
TextView txt=(TextView)findViewById(R.id.text2);
double k=Double.parseDouble(extras.getString("change"));
if(k<0)
{
txt.setTextColor(Color.RED);
}
else
{
txt.setTextColor(Color.RED);
}
list.add(temp2);
}
}
I would like to set the color of the textview to green if change in price is grater than 0 else i want it to be red in color .The following code throws a null pointer exception at the setTextColor(). How exactly do i dothis
Related
I am working on a program and I would like to display a ListView with 2 lines (a Heading and a text) but the lines come from 2 different string[]
how can I do that ? Here is my code right now (I only have one line)
public class MainActivity : Activity
{
Button addATaskButton;
ListView listeView;
View view;
Activity context;
private List<string> titres = new List<string>();
private List<string> textes = new List<string>();
protected override void OnCreate(Bundle bundle)
{
base.OnCreate(bundle);
// Set our view from the "main" layout resource
SetContentView (Resource.Layout.Main);
addATaskButton = FindViewById<Button>(Resource.Id.AddATaskButton);
listeView = FindViewById<ListView>(Resource.Id.listeTasks);
ISharedPreferences prefs = PreferenceManager.GetDefaultSharedPreferences(ApplicationContext);
ISet<string> listeTitresTaches = new HashSet<string>(prefs.GetStringSet("Titres", new HashSet<string>()));
ISet<string> listeTextesTaches = new HashSet<string>(prefs.GetStringSet("Textes", new HashSet<string>()));
foreach (string items in listeTitresTaches)
{
titres.Add(items);
}
foreach (string items2 in listeTextesTaches)
{
textes.Add(items2);
}
//view = context.LayoutInflater.Inflate(Android.Resource.Layout.SimpleListItem2, null);
var ListAdapter = new ArrayAdapter(this, Android.Resource.Layout.SimpleListItem2, titres.ToArray());
listeView.Adapter = ListAdapter;
addATaskButton.Click += delegate
{
StartActivity(typeof(AddTaskActivity));
};
}
}
Thank you for your help !
I would like to display a ListView with 2 lines
SimpleAdapter should be suitable for you.
Try the following code:
public class MainActivity : Activity
{
ListView lv;
protected override void OnCreate(Bundle bundle)
{
base.OnCreate(bundle);
SetContentView (Resource.Layout.Main);
lv = FindViewById<ListView>(Resource.Id.listView1);
SimpleAdapter adapter = new SimpleAdapter(this, getData(),Resource.Layout.ListViewItem,
new string[] { "textView1", "textView2" },
new int[] { Resource.Id.textView1, Resource.Id.textView2});
lv.Adapter = adapter;
}
public List<IDictionary<string, object>> getData()
{
List<IDictionary<string, object>> list = new List<IDictionary<string, object>>();
for (int i = 0; i < 10; i++)
{
var item1 = new JavaDictionary<string, object>();
item1.Add("textView1", "Title Mike Ma");
item1.Add("textView2", "Body Mike Ma");
list.Add(item1);
}
return list;
}
}
screen shot:
I am new to Android. I am Using "com.devsmart.android.ui.HorizontalListView" to show my items(playing cards). In the List I am getting 8 cards in the first attempt. What I want if I again call the method the there must be 7 cards so on means 1 cards must be remove from the list at each time till the list gets empty. But I am not able not do this removing of item from the list. I am posting my code here. Help will be appreciated.
MainActivity.java
ArrayList<HashMap<String, String>> aList9;
Button btn_aditional_card;
HorizontalListView list1;
int[] cards3 = new int[]{
R.drawable.card1,
R.drawable.card1,
R.drawable.card1,
R.drawable.card1,
R.drawable.card1,
R.drawable.card1,
R.drawable.card1,
R.drawable.card1,
R.drawable.card1,
R.drawable.card1,
R.drawable.card1,
R.drawable.card1,
R.drawable.card1,
R.drawable.card1
};
public class MainActivity extends AppCompatActivity{
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
btn_aditional_card = (Button) findViewById(R.id.btn_aditional_card);
list1 = (HorizontalListView) findViewById(R.id.listview1);
btn_aditional_card.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View v) {
add8();
}
});
}
public void add8() {
final android.view.animation.Animation animScale = AnimationUtils.loadAnimation(this, R.anim.slide_right_in);
list1.startAnimation(animScale);
aList9 = new ArrayList<HashMap<String, String>>();
for (int i = 0; i < 8; i++) {
HashMap<String, String> hm = new HashMap<String, String>();
hm.put("card", Integer.toString(cards3[i]));
aList9.add(hm);
}
String[] from = {"card"};
int[] to = {R.id.ImageView};
final SimpleAdapter adapter = new SimpleAdapter(getBaseContext(), aList9, R.layout.activity_animation__adapter, from, to);
list1.setAdapter(adapter);
adapter.notifyDataSetChanged();
list1.setOnItemClickListener(new AdapterView.OnItemClickListener() {
#Override
public void onItemClick(AdapterView<?> parent, View view, int position, long id) {
aList9.remove(aList9.size() - 1);
adapter.notifyDataSetChanged();
}
});
}
Here removing of item from the list must be done on list1.setOnItemClickListener but I don't have any idea how.
In your list1.setOnItemClickListener, do this:
if (aList9.size() > 0) {
aList9.remove(aList9.size() - 1);
adapter.notifyDataSetChanged();
}
When removing item from data list, you have to notify your adapter to update view.
You can remove the last item from the list like;
if (aList9.size() > 0) {
aList9.remove(aList9.size() - 1);
}
Another solution,
Take Length of your integer array and traverse the loop inside your add8 method according to this length and at the end of the method decrement the length by one, like;
int length = cards3.length;
Inside your add8 method;
for (int i = 0; i < length; i++) {
HashMap<String, String> hm = new HashMap<String, String>();
hm.put("card", Integer.toString(cards3[i]));
aList9.add(hm);
}
After for loop decrement the length like;
length--;
Hope you'll get the solution.
In your main activity the code should look like.I am using arraylist instead you can use hashmap.This code is only to show you way what you need to do. follow this code in your project you will get solution this is tested in my site and working fine you need to change somewhere according to your code.In button click i am only removing last item from arraylist and notifying that dataset changed.hope it will help you.
ArrayList<String> arrlist = new ArrayList<String>();
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
arrlist.add("B");
arrlist.add("C");
arrlist.add("D");
arrlist.add("E");
arrlist.add("F");
arrlist.add("G");
ListView lv = (ListView) findViewById(R.id.listview);
Button btnShowList = (Button) findViewById(R.id.btnShowList);
final ArrayAdapter adapter = new ArrayAdapter<String>(this,
android.R.layout.simple_list_item_1, arrlist);
//Listview adapter
lv.setAdapter(adapter);
btnShowList.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View v) {
if (arrlist.size() > 0) {
arrlist.remove(arrlist.size() - 1);
adapter.notifyDataSetChanged();
}
}
});
}
Read the comments
class MainActivity extends AppCompatActivity {
//make your Adapter global
private SimpleAdapter adapter;
ArrayList<HashMap<String, String>> aList9;
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
add8();
btn_aditional_card.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View v) {
// on button click you can add a view to the listview if you want
// if you don't want this just comment out the following line
// i still don't understand what you want to do with this button
alist9.add(...);
// if you add stuff in the array list then notify the adapter
// it will update the view
adapter.notifyDataSetChanged();
}
});
}
public void add8() {
// initialize your ArrayList and listview
//populate them
for(int i = 0; i < 8; i++) {
// do your stuff.
// populate the list
}
// initialize your adapter as before
adapter = new SimpleAdapter(....);
listview.setadapter(adapter);
adapter.notifyDataSetChanged();
list1.setOnItemClickListener(new AdapterView.OnItemClickListener() {
#Override
public void onItemClick(AdapterView<?> parent, View view, int position, long id) {
// delete the items like this
// check if size is greater than 0 and then remove
aList9.remove(aList9.size() - 1);
adapter.notifyDataSetChanged();
}
});
}
}
I have a listvew and I add subitem into the listview like this code
public class MyCustomListView extends Activity {
/** Called when the activity is first created. */
ListView lv;
#Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.custom_list_view);
lv=(ListView) this.findViewById(R.id.lvvv);
SimpleAdapter adapter = new SimpleAdapter(this,list, R.layout.custom_row_view,new String[] {"pen","color"},
new int[] {R.id.text1, R.id.text3}
);
populateList();
lv.setAdapter(adapter);
}
static final ArrayList<HashMap<String,String>> list =
new ArrayList<HashMap<String,String>>();
private void populateList() {
HashMap<String,String> temp = new HashMap<String,String>();
temp.put("pen","MONT Blanc");
temp.put("color", "Black");
list.add(temp);
HashMap<String,String> temp1 = new HashMap<String,String>();
temp1.put("pen","Gucci");
temp1.put("color", "Red");
list.add(temp1);
HashMap<String,String> temp2 = new HashMap<String,String>();
temp2.put("pen","Parker");
temp2.put("color", "Blue");
}
}
but in the color key, if I have a lot of colors for a pen, and I want to arrange the colors into a list and this color list is under the pen.
ex:
-pen: Parker.
+color: blue.
+color: red.
how should I do that? please help me!
thank alot.
You need to use an ExpanadableListView. Check out this -
ExpanadaleListView Tutorial
After lot of research over internet i could not find a answer how to enable a phone call in a list view.
here is my sample code:
Suppose i have a list of 50 hospital with there phone contact detail
public class Medical extends ListActivity {
static final ArrayList<HashMap<String,String>> list =
new ArrayList<HashMap<String,String>>();
/** Called when the activity is first created. */
#Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.bus_main);
SimpleAdapter adapter = new SimpleAdapter(
this,
list,
R.layout.rowview,
new String[] {"title","address","phone"},
new int[] {R.id.text1,R.id.text2, R.id.text3}
);
populateList();
setListAdapter(adapter);
}
private void populateList() {
HashMap<String,String>
map = new HashMap<String,String>();
map.put("title","UHS Hospital");
map.put("address", "Street 54");
map.put("phone", "4077000");
list.add(map);
map = new HashMap<String,String>();
map.put("title","Calvary Hospital");
map.put("address", "Street 43");
map.put("phone", "2362491");
list.add(map);
}
}
How to enable phone call to all listview entry based on individual Phone number detail (text3) of a hospital.
add this method in your activity:
public class Medical extends ListActivity {
static final ArrayList<HashMap<String,String>> list =
new ArrayList<HashMap<String,String>>();
/** Called when the activity is first created. */
#Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
SimpleAdapter adapter = new SimpleAdapter(
this,
list,
R.layout.rowview,
new String[] {"title","address","phone"},
new int[] {R.id.textView1,R.id.textView2, R.id.textView3}
);
populateList();
setListAdapter(adapter);
}
protected void onListItemClick (ListView l, View v, int position, long id){
super.onListItemClick(l,v,position,id);
if(position>=0 && position<list.size()) {
HashMap<String, String> tmp = list.get(position);
if(tmp.containsKey("phone")) {
String tel = tmp.get("phone");
Intent callIntent = new Intent(Intent.ACTION_CALL);
callIntent.setData(Uri.parse("tel:"+tel));
startActivity(callIntent);
}
}
}
private void populateList() {
HashMap<String,String>
map = new HashMap<String,String>();
map.put("title","UHS Hospital");
map.put("address", "Street 54");
map.put("phone", "4077000");
list.add(map);
map = new HashMap<String,String>();
map.put("title","Calvary Hospital");
map.put("address", "Street 43");
map.put("phone", "2362491");
list.add(map);
}
}
and add
<uses-permission android:name="android.permission.CALL_PHONE" />
in your manifest
Attention This code does not check if the number is valid.
I have serious problems with my ListActivity. When I open it and start scrolling, the app freezes for some seconds and after that it can be scrolled smoothly. I don't get an "application not responding" error. I made a *.hprof heap dump and put it into MAT. Here you can see my leaks:
Seems like something is fishy. Maybe I'm not using the cursor in the right way.
Here you can take a look at my code:
public class ListViewActivity extends ListActivity implements OnClickListener {
// Resources
static String like;
// Cursor
private SimpleCursorAdapter adapter;
private Cursor cursor;
String[] showColumns;
int[] showViews;
// Database
private DBAccess dbAccess;
#Override
public void onCreate(Bundle savedInstanceState) {
// Remove title bar
this.requestWindowFeature(Window.FEATURE_NO_TITLE);
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_listview);
ListViewActivity.like = "";
Intent intent = getIntent(); // gets the previously created intent
ListViewActivity.like = intent.getStringExtra("like");
new DatabaseTask().execute(null, null, null);
}
#Override
protected void onListItemClick(ListView l, View v, int position, long id) {
Cursor item = (Cursor) getListAdapter().getItem(position);
Intent intent = new Intent(ListViewActivity.this, ListClickActivity.class);
intent.putExtra("id", item.getString(0));
startActivity(intent);
}
private class DatabaseTask extends AsyncTask<Void, Void, Void> {
#Override
protected Void doInBackground(Void... params) {
Log.v("doInBackground", "started!");
dbAccess = new DBAccess(ListViewActivity.this, 1, "FishingMatey.db");
dbAccess.initDownloadedDatabase();
cursor = dbAccess
.createBewirtschafterListViewCursor(ListViewActivity.like);
showColumns = new String[] { "gewName", "reviergrenzen" };
showViews = new int[] { R.id.datensatz_gewName,
R.id.datensatz_reviergrenzen };
Log.v("doInBackground", "finished!");
return null;
}
protected void onPostExecute(Void params) {
adapter = new SimpleCursorAdapter(ListViewActivity.this,
R.layout.datensatz, cursor, showColumns, showViews);
setListAdapter(adapter);
dbAccess.closeDatabase();
Log.v("onPostExecute", "finished!");
}
}
}
EDIT1:
The issue doesn't come from the database because I have the same leak with the following code:
public class ListViewActivity extends ListActivity {
// Activity
public static Activity forFinish;
// Resources
static String like;
// Cursor
private SimpleAdapter adapter;
String[] showColumns;
int[] showViews;
#Override
public void onCreate(Bundle savedInstanceState) {
// Remove title bar
this.requestWindowFeature(Window.FEATURE_NO_TITLE);
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_listview);
forFinish = this;
ListViewActivity.like = "";
Intent intent = getIntent(); // gets the previously created intent
ListViewActivity.like = intent.getStringExtra("like");
// create the grid item mapping
showColumns = new String[] { "gewName", "reviergrenzen" };
showViews = new int[] { R.id.datensatz_gewName,
R.id.datensatz_reviergrenzen };
// prepare the list of all records
List<HashMap<String, String>> fillMaps = new ArrayList<HashMap<String, String>>();
for (int i = 0; i < 20; i++) {
HashMap<String, String> map = new HashMap<String, String>();
map.put("gewName", "See" + i);
map.put("reviergrenzen", "Revier" + i);
fillMaps.add(map);
}
// fill in the grid_item layout
SimpleAdapter adapter = new SimpleAdapter(this, fillMaps,
R.layout.datensatz, showColumns, showViews);
setListAdapter(adapter);
}
}
Would be awesome if someone can find the memory leak.
Greetings Mike!
If you are using images in your list items then move the image loading to a background task. You could have a look at smoothie, an asynchronous loading list that can be used with Android-BitmapCache for better performance.