I'm going to create gridview with a button as last item of gridview which i want to use it as add button .
For example:
When you click the button (item 1) add to gridview and (add button) go to Second item
Item1 Button
Item1 Item2
Item3 Item4
Button
Something like top style
Here you got what i did to achieve this.
MainActivity class:
public class MainActivity extends AppCompatActivity {
GridView gridView;
GridAdapter adapter;
List<String> list;
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
list = new ArrayList<>();
for (int i = 0; i < 5; i++) {
list.add("Test " + i);
}
gridView = (GridView) findViewById(R.id.gridView);
adapter = new GridAdapter(this, list);
gridView.setAdapter(adapter);
}
}
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"
tools:context="com.example.stackoverflow.MainActivity">
<GridView
android:id="#+id/gridView"
android:layout_width="match_parent"
android:layout_height="match_parent">
</GridView>
</RelativeLayout>
Now make an adapter for gridView
public class GridAdapter extends BaseAdapter {
List<String> list;
Context context;
public GridAdapter(Context context, List<String> list) {
this.list = list;
this.context = context;
}
#Override
public int getCount() {
return list.size();
}
#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) {
View view = convertView;
if (view == null) {
LayoutInflater inflater = (LayoutInflater) context.getSystemService(Context.LAYOUT_INFLATER_SERVICE);
view = inflater.inflate(R.layout.griditem, parent, false);
}
TextView textView = (TextView) view.findViewById(R.id.textView);
LinearLayout linearLayout = (LinearLayout) view.findViewById(R.id.linearLayout);
textView.setText(list.get(position));
if (list.size() - 1 == position) {
linearLayout.addView(addButton());
}
return view;
}
private Button addButton() {
LinearLayout.LayoutParams params = new LinearLayout.LayoutParams(ViewGroup.LayoutParams.MATCH_PARENT,
ViewGroup.LayoutParams.WRAP_CONTENT);
Button button = new Button(context);
button.setLayoutParams(params);
button.setText("Testing");
return button;
}
}
And gridItem.xml is
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:id="#+id/linearLayout"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:orientation="vertical">
<TextView
android:id="#+id/textView"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_gravity="center_horizontal"
android:text="Testing"
android:textAppearance="#style/TextAppearance.AppCompat.Headline"
android:textStyle="bold" />
</LinearLayout>
It is the main idea that you get the last item and add a button at last. You can refine this code and also could use recyclerView. Now when you add an item to list then call notifyDataSetChanged();
Hope it will help you.
One possiblity is that, You can design multiple grid-item layouts as per your requirements. And then in "getView" method of Adapter class you can check which xml to inflate as a view.
hope this will help you to dig it up.
Related
I am new to android programming and this task is really need for my school project. Please kindly help me.
I've string array List - (retrieved from csv)
list = new ArrayList<>(Arrays.asList("111,222,333,444,555,666".split(",")));
myList.setAdapter(new ArrayAdapter<String>(getActivity(),R.layout.cell,list));
The result is showing only line by line text of arrayList. I want to add button to each generated line by line to delete clicked row.
Please how can I do this. Thank you for understanding my problem.
You have to create a custom layout xml which having a single item then you will add your button to this layout along with any other items.
CustomLayout.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" >
<TextView
android:id="#+id/tvContact"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:textSize="18sp"
android:textStyle="bold" />
<Button
android:id="#+id/btn"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="Call" />
</RelativeLayout>
Now after creating custom item layout you need listview which holds all items.
MainActivity.xml
.
.
<ListView
xmlns:android="http://schemas.android.com/apk/res/android"
android:id="#+id/listview"
android:layout_width="match_parent"
android:layout_height="match_parent" />
.
.
Now in java file just set adapter with our custom layout xml
.
.
list = new ArrayList<String>(Arrays.asList("111,222,333,444,555,666".split(",")));
listview.setAdapter(new MyCustomAdapter(list, context) );
.
.
Custom adapter Class
public class MyCustomAdapter extends BaseAdapter implements ListAdapter {
private ArrayList<String> list = new ArrayList<String>();
private Context context;
public MyCustomAdapter(ArrayList<String> list, Context context) {
this.list = list;
this.context = context;
}
#Override
public int getCount() {
return list.size();
}
#Override
public Object getItem(int pos) {
return list.get(pos);
}
#Override
public long getItemId(int pos) {
return list.get(pos).getId();
//just return 0 if your list items do not have an Id variable.
}
#Override
public View getView(final int position, View convertView, ViewGroup parent) {
View view = convertView;
if (view == null) {
LayoutInflater inflater = (LayoutInflater) context.getSystemService(Context.LAYOUT_INFLATER_SERVICE);
view = inflater.inflate(R.layout.CustomLayout, null);
}
//Handle TextView and display string from your list
TextView tvContact= (TextView)view.findViewById(R.id.tvContact);
tvContact.setText(list.get(position));
//Handle buttons and add onClickListeners
Button callbtn= (Button)view.findViewById(R.id.btn);
callbtn.setOnClickListener(new View.OnClickListener(){
#Override
public void onClick(View v) {
//do something
}
});
addBtn.setOnClickListener(new View.OnClickListener(){
#Override
public void onClick(View v) {
//do something
notifyDataSetChanged();
.
}
});
return view;
}
}
We have need ListviewActivity for listing your data
SchoolAdapter which is custom adapter to inflate each individual row
activity_listview which is layout for ListviewActivity
view_listview_row which is required for each individual row
Now create all file as below
For ListviewActivity,
public class ListviewActivity extends AppCompatActivity {
private ListView mListview;
private ArrayList<String> mArrData;
private SchoolAdapter mAdapter;
#Override
protected void onCreate(#Nullable Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_listview);
mListview = (ListView) findViewById(R.id.listSchool);
// Set some data to array list
mArrData = new ArrayList<String>(Arrays.asList("111,222,333,444,555,666".split(",")));
// Initialize adapter and set adapter to list view
mAdapter = new SchoolAdapter(ListviewActivity.this, mArrData);
mListview.setAdapter(mAdapter);
mAdapter.notifyDataSetChanged();
}
For SchoolAdapter,
public class SchoolAdapter extends BaseAdapter {
private Context mContext;
private ArrayList<String> mArrSchoolData;
public SchoolAdapter(Context context, ArrayList arrSchoolData) {
super();
mContext = context;
mArrSchoolData = arrSchoolData;
}
public int getCount() {
// return the number of records
return mArrSchoolData.size();
}
// getView method is called for each item of ListView
public View getView(int position, View view, ViewGroup parent) {
// inflate the layout for each item of listView
LayoutInflater inflater = (LayoutInflater) mContext.getSystemService(Context.LAYOUT_INFLATER_SERVICE);
view = inflater.inflate(R.layout.view_listview_row, parent, false);
// get the reference of textView and button
TextView txtSchoolTitle = (TextView) view.findViewById(R.id.txtSchoolTitle);
Button btnAction = (Button) view.findViewById(R.id.btnAction);
// Set the title and button name
txtSchoolTitle.setText(mArrSchoolData.get(position));
btnAction.setText("Action " + position);
// Click listener of button
btnAction.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View view) {
// Logic goes here
}
});
return view;
}
public Object getItem(int position) {
// TODO Auto-generated method stub
return position;
}
public long getItemId(int position) {
// TODO Auto-generated method stub
return position;
}}
For activity_listview,
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:background="#D1FFFF"
android:orientation="vertical">
<ListView
android:id="#+id/listSchool"
android:layout_width="fill_parent"
android:layout_height="fill_parent"
android:divider="#0000CC"
android:dividerHeight="0.1dp"></ListView>
For view_listview_row,
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:orientation="vertical"
android:paddingBottom="7.5dp"
android:paddingLeft="15dp"
android:paddingRight="15dp"
android:paddingTop="7.5dp">
<TextView
android:id="#+id/txtSchoolTitle"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:paddingLeft="2dp"
android:text="TextView"
android:textColor="#android:color/black"
android:textSize="20dp" />
<Button
android:id="#+id/btnAction"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_gravity="right"
android:text="Click Me" />
At last but not least, do not forgot to add your activity in manifest.xml
Create a custom list view in another file with the only content of each item in the list.
Then create a Custom Adapter extending BaseAdapter and bind it.
Please refer to this website for example.
https://looksok.wordpress.com/tag/listview-item-with-button/
OR
http://www.androidhive.info/2012/02/android-custom-listview-with-image-and-text/
i want to combine two LinearLayout, both have different TextView arrangement in them, in a single ListView. so the final look should be like below:
and i run it with my code, but the app wouldn't start. below are my code.
Activity class:
public class MainActivity extends Activity {
// Create list of items
String[] publicModeItems = {
"AAAAA",
"BBBBB"
};
String[] publicModeParameters = {
"YES",
"NO"
};
String[] publicModeResetExe = {
"CCCCC",
"DDDDD"
};
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
populateListView();
}
private void populateListView() {
CustomList adapter1 = new CustomList(this, publicModeItems, publicModeParameters);
// Build adapter
ArrayAdapter<String> adapter2 = new ArrayAdapter<String>(
this, // context for the activity
R.layout.text_view_test, // layout to use (create)
publicModeResetExe); // items to display
// Configure the list view
ListView list = (ListView) findViewById(R.id.PublicModeListView);
list.setAdapter(adapter1);
list.setAdapter(adapter2);
}
private class CustomList extends ArrayAdapter<String> {
private final Activity context;
private final String[] publicModeItems;
private final String[] publicModeParameters;
public CustomList(Activity context,
String[] publicModeItems,
String[] publicModeParameters) {
super(context, R.layout.text_views_1, publicModeItems);
this.context = context;
this.publicModeItems = publicModeItems;
this.publicModeParameters = publicModeParameters;
}
#Override
public View getView(final int position, View convertView, ViewGroup parent) {
LayoutInflater layoutinflater = context.getLayoutInflater();
View rowView = layoutinflater.inflate(R.layout.text_views_1, null, true);
TextView txtPublicModeItems = (TextView) rowView.findViewById(R.id.PublicModeItems);
TextView txtPublicModeParameters = (TextView) rowView.findViewById(R.id.PublicModeParameters);
txtPublicModeItems.setText(publicModeItems[position]);
txtPublicModeParameters.setText(publicModeParameters[position]);
return rowView;
}
}
}
text_views_1 xml:
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:id="#+id/PublicModeLayoutForTextView"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:orientation="horizontal" >
<TextView
android:id="#+id/PublicModeItems"
android:layout_width="200sp"
android:layout_height="wrap_content"
android:textColor="#drawable/text_color_change" />
<TextView
android:id="#+id/PublicModeOpenBracket"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="["
android:textColor="#drawable/text_color_change" />
<TextView
android:id="#+id/PublicModeParameters"
android:layout_width="100sp"
android:layout_height="wrap_content"
android:gravity="end"
android:textColor="#drawable/text_color_change" />
<TextView
android:id="#+id/PublicModeCloseBracket"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="]"
android:textColor="#drawable/text_color_change" />
</LinearLayout>
text_view_test xml:
<?xml version="1.0" encoding="utf-8"?>
<TextView xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:textColor="#drawable/text_color_change" >
</TextView>
activity_main xml:
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
android:id="#+id/PublicModeListViewLayout01"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:background="#color/black"
android:baselineAligned="true"
android:orientation="vertical"
tools:context="com.example.mycalendar.MainActivity" >
<LinearLayout
android:id="#+id/PublicModeListViewLayout02"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:orientation="vertical"
android:background="#drawable/custom_border"
android:padding="5dp" >
<ListView
android:id="#+id/PublicModeListView"
android:layout_width="308dp"
android:layout_height="wrap_content"
android:choiceMode="singleChoice"
android:listSelector="#color/yellow"
android:smoothScrollbar="true" >
</ListView>
</LinearLayout>
</LinearLayout>
Problem : I just run my code just now, and only 'CCCCC' and 'DDDDD' is showing. so do you have any idea on this?
You should inherit your list adapter from BaseAdapter rather than ArrayAdapter.
Rewrite adapter's getView() method to inflate layout according position, like below.
public View getView(int position, View convertView, ViewGroup parent) {
...
View rootView = null;
if (position == 0 || position == 1) {
rootView = layoutinflater.inflate(R.layout.text_views_1, null, true);
} else {
rootView = layoutinflater.inflate(R.layout.text_views, null, true);
}
...
return rootView;
}
You set the list adapter twice
list.setAdapter(adapter1);
list.setAdapter(adapter2);
in this case the current adapter is the second, not them both.
Use ListView with SimpleAdapter or a custom adapter and that will solve all your problems, check out this for SimpleAdapter tutorial to learn a the basics and this tutorial to learn how you can make multiple views instead of just 1. This tutorial is about creating custom adapter
BTW, I have few comments on your code and xml layout
First, there is no need for 2 TextViews for your bracket, you can easily add them programmatically to the String[] or even to YES/NO TextView.
Second, You're not using a ViewHolder in your CustomList adapter and this is not a good practice as every time you scroll your list, it creates new view although it can use already existing one.
I already solve this problem. but it seems not so convenient to use this method.
public class PublicModeActivity extends Activity {
// Create list of items
String[] publicModeItems = {
"AAAAA",
"BBBBB"
};
String[] publicModeParameters = {
"YES",
"NO"
String[] publicModeResEx = {
"",
"",
"CCCCC",
"DDDDD"
};
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
populateListView();
}
private void populateListView() {
CustomList adapter = new CustomList(this, publicModeItems, publicModeParameters, publicModeResEx);
// Configure the list view
ListView list = (ListView) findViewById(R.id.PublicModeListView);
list.setAdapter(adapter);
}
private class CustomList extends BaseAdapter {
private final Activity context;
private final String[] publicModeItems;
private final String[] publicModeParameters;
private final String[] publicModeResEx;
public CustomList(Activity context,
String[] publicModeItems,
String[] publicModeParameters,
String[] publicModeResEx) {
super();
this.context = context;
this.publicModeItems = publicModeItems;
this.publicModeParameters = publicModeParameters;
this.publicModeResEx = publicModeResEx;
}
#Override
public View getView(final int position, View convertView, ViewGroup parent) {
LayoutInflater layoutinflater = context.getLayoutInflater();
View rowView = null;
Log.i("PublicModeActivity", "" + position);
if (position < 2) {
rowView = layoutinflater.inflate(R.layout.text_views_1, null, true);
TextView txtPublicModeItems = (TextView) rowView.findViewById(R.id.PublicModeItems);
TextView txtPublicModeParameters = (TextView) rowView.findViewById(R.id.PublicModeParameters);
txtPublicModeItems.setText(publicModeItems[position]);
txtPublicModeParameters.setText(publicModeParameters[position]);
} else {
rowView = layoutinflater.inflate(R.layout.text_view_test, null, true);
TextView txtPublicModeResEx = (TextView) rowView.findViewById(R.id.PublicModeResEx);
txtPublicModeResEx.setText(publicModeResEx[position]);
}
return rowView;
}
#Override
public int getCount() {
return 4;
}
#Override
public Object getItem(int position) {
return position;
}
#Override
public long getItemId(int position) {
return position;
}
}
}
I need to put that blank string "", to match the number of row with the upper layout (text_views_1) even-though those blank string are use in different layout. so it is not so convenient especially when you want to display so many data. If someone here have much simpler method than this. feel free to share with me/us. i'm eager to learn. thank you!
Well I do not know what should be the proper title for the question , but my problem is quite amazing, do not know is it possible or not. Here is my question
I have series of images and I want to set them in a ListView. following is a ListView row Xml.(named anim_list_row)
<?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"
android:weightSum="100"
>
<ImageView
android:layout_width="0dp"
android:layout_height="350dp"
android:scaleType="fitXY"
android:id="#+id/iv_dummy_left"
android:layout_marginLeft="5dp"
android:layout_weight="50"/>
<ImageView
android:layout_width="0dp"
android:layout_height="350dp"
android:scaleType="fitXY"
android:id="#+id/iv_dummy_right"
android:layout_weight="50"
android:layout_marginRight="5dp"/>
</LinearLayout>
in this you can see that I want to set the 2 different images in two different let say left and right ImageView. Following is my adapter class
public class MListAdapter extends BaseAdapter {
private Context context;
private ArrayList<AnimListItems> mAnimListItems;
public MListAdapter(Context context, ArrayList<AnimListItems> mAnimListItems){
this.context = context;
this.mAnimListItems = mAnimListItems;
}
#Override
public int getCount() {
return mAnimListItems.size();
}
#Override
public Object getItem(int position) {
return navDrawerItems.get(position);
}
#Override
public long getItemId(int position) {
return position;
}
#Override
public View getView(int position, View convertView, ViewGroup parent) {
if (convertView == null) {
LayoutInflater mInflater = (LayoutInflater)
context.getSystemService(Activity.LAYOUT_INFLATER_SERVICE);
convertView = mInflater.inflate(R.layout.anim_list_row, null);
}
ImageView imgIconLeft = (ImageView) convertView.findViewById(R.id.iv_dummy_left);
ImageView imgIconRight = (ImageView) convertView.findViewById(R.id.iv_dummy_right);
//TextView txtTitle = (TextView) convertView.findViewById(R.id.title);
imgIconLeft.setImageResource(navDrawerItems.get(position).getIcon());
//if I do not do +1 here it sets same image to both left and right ImageView
imgIconRight.setImageResource(navDrawerItems.get(position+1).getIcon());
// txtTitle.setText(navDrawerItems.get(position).getTitle());
return convertView;
}
}
so here is problem this list view is working but it is assigning the same images to both ImageView in the row. and if I do +1 as following
imgIconRight.setImageResource(navDrawerItems.get(position+1).getIcon())
then it helps in changing the image view at right side in the row, but the 2nd row repeat the image in its first imageview (I mean the image in the left ImageView of the 2nd row is same as the image in right ImageView of first row.)
So what is a solution of
Repeating images in a rows.
And How can I get each ImageView id and its resourceid of the image so that I can come to know which image has been clicked. And then I can able to set that image into another activity's ImageView. I mean I wanted to know which image has been clicked by the user , so I want to set same image in the ImageView of other activity.
Hello If you want to user one single array then i have made one demo example for your problem quickly i think it will help you.
MainActivity.java
public class MainActivity extends ActionBarActivity {
Item item;
ArrayList<Object> obj = new ArrayList<Object>();
MListAdapter adapter;
ListView lv;
int[] arrEnabledImageIds = new int[] { R.drawable.ic_launcher,
R.drawable.ic_delete_icon, R.drawable.ic_delete_icon,
R.drawable.ic_launcher, R.drawable.ic_delete_icon,
R.drawable.ic_launcher };
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
lv = (ListView) findViewById(R.id.listView1);
for (int i = 0; i < arrEnabledImageIds.length; i++) {
Item itemInfo = new Item();
itemInfo.image1 = arrEnabledImageIds[i];
i++;
itemInfo.image2 = arrEnabledImageIds[i];
obj.add(itemInfo);
}
adapter = new MListAdapter(this, R.layout.row, obj);
lv.setAdapter(adapter);
}
}
activity_main.xml
<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"
android:orientation="vertical"
>
<ListView
android:id="#+id/listView1"
android:layout_width="match_parent"
android:layout_height="wrap_content" >
</ListView>
</LinearLayout>
Item.java
public class Item implements Serializable {
public static final long serialVersionUID = 1L;
public int image1;
public int image2;
}
row.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="horizontal" >
<ImageView
android:id="#+id/ivLeft"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:src="#drawable/ic_launcher" />
<ImageView
android:id="#+id/ivRight"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:src="#drawable/ic_launcher" />
</LinearLayout>
MListAdapter.java
public class MListAdapter extends ArrayAdapter<Object> {
private Context context;
int resId;
private ArrayList<Object> mAnimListItems;
public MListAdapter(Context context, int textViewResourceId,
ArrayList<Object> mAnimListItems) {
super(context, textViewResourceId, mAnimListItems);
this.resId = textViewResourceId;
this.context = context;
this.mAnimListItems = mAnimListItems;
}
#Override
public View getView(int position, View convertView, ViewGroup parent) {
if (convertView == null) {
LayoutInflater mInflater = (LayoutInflater) context
.getSystemService(Activity.LAYOUT_INFLATER_SERVICE);
convertView = mInflater.inflate(resId, null);
}
ImageView imgIconLeft = (ImageView) convertView
.findViewById(R.id.ivLeft);
ImageView imgIconRight = (ImageView) convertView
.findViewById(R.id.ivRight);
// TextView txtTitle = (TextView) convertView.findViewById(R.id.title);
Item item = (Item) mAnimListItems.get(position);
imgIconLeft.setImageResource(item.image1);
// if I do not do +1 here it sets same image to both left and right
// ImageView
imgIconRight.setImageResource(item.image2);
// txtTitle.setText(navDrawerItems.get(position).getTitle());
return convertView;
}
}
try to use two different array/arraylist to store left and rightside images seprately.
settag as l+position for left image
settag as r+position for right image
you can identify the clicked image by
imgIconLeft.setOnClickListener(new OnClickListener() {
#Override
public void onClick(View v) {
if(v.getTag.toString().contains("l"){
// then it's a left button.
String position=v.getTag.toString().subString(1,v.getTag.toString().length()-1);
// to get position
}
});
I'd like to customize some settings (color, margin) for some items on a listview in a listactivity after or before setting the adapter. How can I do that? Is there any function that can I override?
Thank you.
you can use an own listadapter.. http://www.vogella.com/articles/AndroidListView/article.html
This is how you can do to customize item of your list:
Layout of your list:
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:orientation="vertical"
android:layout_width="match_parent"
android:layout_height="match_parent">
<ListView
android:id="#android:id/list"
android:layout_width="match_parent"
android:layout_height="match_parent"
/>
</LinearLayout>
Layout of each item:
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:orientation="vertical"
android:layout_width="match_parent"
android:layout_height="match_parent">
<TextView
android:id="#+id/text"
android:layout_height="wrap_content"
android:layout_width="wrap_content"
/>
</LinearLayout>
And finaly your activity:
public class MyActivity extends ListActivity {
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.list_activitty);
final List<String> list = new ArrayList<String>();
list.add("test");
list.add("test");
list.add("test");
final CustomAdapter adapter = new CustomAdapter(this, list);
final ListView listView = getListView();
listView.setAdapter(adapter);
}
public class CustomAdapter extends BaseAdapter {
private Context mContext;
private List<String> mList;
public CustomAdapter(Context context, List<String> list) {
mContext = context;
mList = list;
}
#Override
public int getCount() {
return mList.size();
}
#Override
public String getItem(int position) {
return mList.get(position);
}
#Override
public long getItemId(int position) {
return 0;
}
#Override
public View getView(int position, View convertView, ViewGroup parent) {
final Holder holder;
if (convertView == null) {
// if it is the first time you create the row
// you get the layout of each row here
convertView = LayoutInflater.from(mContext).inflate(R.layout.item_list, null);
// you keep your layout in a holder
holder = new Holder();
holder.mText = (TextView) convertView.findViewById(R.id.text);
convertView.setTag(holder);
} else {
// if the row has already been created, you get it from the holder
holder = (Holder) convertView.getTag();
}
// you do what you want with the content
holder.mText.setText(getItem(position));
holder.mText.setTextColor(Color.BLUE);
return convertView;
}
private class Holder {
public TextView mText;
}
}
}
I have an android activity with a gridview, each cell contains a textview with a single character (so there are around 60-70 characters/cells on the screen at a time). The scrolling of the gridview is unacceptably slow and unsmooth. I tried replacing the gridview with a listview, and the scrolling of the listview is much faster. How can i speed this up?
The activity layout is:
<?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"
android:orientation="vertical" >
<GridView
android:id="#+id/gridView1"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:columnWidth="56dp"
android:numColumns="auto_fit" >
</GridView>
</LinearLayout>
And inside each cell is this layout:
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:orientation="vertical" >
<TextView
android:id="#+id/textView1"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_gravity="center"
android:textSize="40sp" />
</LinearLayout>
And the code for the activity is:
public class TestGridActivity extends Activity {
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.grid_activity);
GridView gridView = (GridView) findViewById(R.id.gridView1);
ArrayList<Map<String, String>> list = getData();
SimpleAdapter arrayAdapter = new SimpleAdapter(this, list,
R.layout.grid_layout, new String[] { "literal"},
new int[] { R.id.textView1});
gridView.setAdapter(arrayAdapter);
}
}
edit: pks asking to post adapter code, the above code I have used a generic simpleAdapter, but i have tried a custom view, which didn't help.
public class GridAdapter extends BaseAdapter {
private Context context;
private ArrayList<Map<String, String>> list;
private LayoutInflater inflater;
public static class ViewHolder {
TextView textView1;
int position;
}
public GridAdapter(Context c, ArrayList<Map<String, String>> l) {
context = c;
list = l;
inflater = (LayoutInflater) context.getSystemService(Context.LAYOUT_INFLATER_SERVICE);
}
#Override
public int getCount() {
return list.size();
}
#Override
public View getView(int position, View convertView, ViewGroup parent) {
ViewHolder holder;
if(convertView == null){
convertView = inflater.inflate(R.layout.grid_layout, null);
holder = new ViewHolder();
holder.textView1 = (TextView) convertView.findViewById(R.id.textView1);
holder.position = position;
convertView.setTag(holder);
} else {
holder = (ViewHolder) convertView.getTag();
}
holder.textView1.setText(list.get(position).get("character"));
return convertView;
}
}
I've also tried creating all the views in advance, and that didn't help scrolling speed.