How to get id of particular item of listview in android?

Question

I am using Listview and set the multiple item and each item have Like, share and comment option. Actually I have fetch the Item Id and also setText of TextView, Its Successfully. But Not able to get Item Id on Like Button Click event for particular item. How to fetch Item Id for every items in Listview on Button Click Event?

Demo for MyAdapter Class:

public class Adapter1 extends BaseAdapter implements OnClickListener {
    public ArrayList<HashMap<String, String>> arr = null;
    Context context = null;
    LayoutInflater layoutInflater = null;
    HashMap<String, String> getData = new HashMap<String, String>();

    String urlLike = null;
    TextView strId = null;

    public NewsFeedAdapter(Context context,
            ArrayList<HashMap<String, String>> arr) {
        this.context = context;
        this.arr= arr;
        layoutInflater = LayoutInflater.from(context);
    }

    @Override
    public int getCount() {
        return arr.size();
    }

    @Override
    public Object getItem(int position) {
        return arr.get(position);
    }

    @Override
    public long getItemId(int position) {
        return position;
    }

    @Override
    public View getView(int position, View convertView, ViewGroup parent) {
        ViewHolder viewHolder = null;
        if (convertView == null) {
            convertView = layoutInflater.inflate(
                    R.layout.my_list_item, null);
            /** initialize ViewHolder */
            viewHolder = new ViewHolder();

            /** Initialize Widgets */
            /** Imageview */

            viewHolder.imgLike = (ImageView) convertView
                    .findViewById(R.id.imgLike);
            viewHolder.imgLike.setOnClickListener(this);

            viewHolder.imgComments = (ImageView) convertView
                    .findViewById(R.id.imgComments);
            viewHolder.imgComments.setOnClickListener(this);

            viewHolder.imgShare = (ImageView) convertView
                    .findViewById(R.id.imgShare);
            viewHolder.imgShare.setOnClickListener(this);

            /** TextView */
            viewHolder.txtId = (TextView) convertView
                    .findViewById(R.id.txtId);

            viewHolder.txtDescription = (TextView) convertView
                    .findViewById(R.id.txtDescription);

            getData = arr.get(position);
            viewHolder.txtId.setText(getData
                    .get(Fragment1.TAG_ID));

            viewHolder.txtDescription.setText(getData
                    .get(Fragment1.TAG_MESSAGE));

            convertView.setTag(viewHolder);

        } else {
            viewHolder = (ViewHolder) convertView.getTag();
        }

        convertView.setOnClickListener(new OnClickListener() {
            @Override
            public void onClick(View v) {               

            }
        });

        return convertView;
    }

    /** ViewHolder Class */
    public class ViewHolder {
        ImageView imgLike = null, imgComments = null,
                imgShare = null;
        TextView txtId = null,txtDescription = null;
    }

    @Override
    public void onClick(View view) {
        switch (view.getId()) {
        case R.id.imgLike:
            strId = ((TextView) view
                    .findViewById(R.id.txtId));
            System.out.println("On Click====="
                    + strId.getText().toString());

            urlLike = "http://www.example.com?id="
                    + strId.getText().toString() + "&user_id="
                    + myDetail.getUserId();

            new sendLikeData().execute();

            break;
        case R.id.imgComments:

            break;
        case R.id.imgShare:

            break;
        default:
            break;
        }
    }

    public class sendLikeData extends AsyncTask<Void, Void, Void> {
        protected void onPreExecute() {
            super.onPreExecute();
        }

        @Override
        protected Void doInBackground(Void... arg0) {
            ServiceHandler sh = new ServiceHandler();
            String jsonStr = sh.makeServiceCall(urlLike, ServiceHandler.GET);
            Log.d("Response : Like", ">" + jsonStr);

            return null;
        }

        protected void onPostExecute(Void result) {
            super.onPostExecute(result);
        };
    }
}
OutPut is, NullPointer Exception in System.out.println("On Click====="
                        + strId.getText().toString());.

enter image description here

xml file is,

<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:id="@+id/masterLayout"
    android:layout_width="fill_parent"
    android:layout_height="wrap_content"
    android:layout_margin="@dimen/five_dp" >

    <TextView
        android:id="@+id/txtDescription"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_alignParentLeft="true"
        android:layout_marginLeft="@dimen/ten_dp"
        android:layout_marginRight="@dimen/ten_dp"
        android:layout_marginTop="@dimen/ten_dp" />

    <ImageView
        android:id="@+id/imgImage"
        android:layout_width="fill_parent"
        android:layout_height="150dp"
        android:layout_below="@+id/txtDescription"
        android:layout_centerHorizontal="true"
        android:layout_marginBottom="@dimen/ten_dp"
        android:layout_marginLeft="@dimen/ten_dp"
        android:layout_marginRight="@dimen/ten_dp"
        android:layout_marginTop="@dimen/ten_dp"
        android:background="@null"
        android:contentDescription="@string/content_description"
        android:src="@drawable/ic_launcher" />

    <LinearLayout
        android:layout_width="fill_parent"
        android:layout_height="wrap_content"
        android:layout_alignParentLeft="true"
        android:layout_below="@+id/imgImage"
        android:background="@drawable/strip"
        android:baselineAligned="false"
        android:gravity="center_vertical"
        android:orientation="horizontal" >

        <RelativeLayout
            android:layout_width="fill_parent"
            android:layout_height="wrap_content"
            android:layout_weight="1" >

            <ImageView
                android:id="@+id/imgLike"
                android:layout_width="wrap_content"
                android:layout_height="wrap_content"
                android:layout_centerHorizontal="true"
                android:layout_centerInParent="true"
                android:contentDescription="@string/content_description"
                android:src="@drawable/like" />

            <TextView
                android:layout_width="wrap_content"
                android:layout_height="wrap_content"
                android:layout_alignTop="@+id/imgLike"
                android:layout_toRightOf="@+id/imgLike"
                android:background="@drawable/getbg"
                android:gravity="center"
                android:padding="@dimen/two_dp"
                android:textColor="@color/white"
                android:textSize="@dimen/ten_sp" />
        </RelativeLayout>

        <RelativeLayout
            android:layout_width="fill_parent"
            android:layout_height="wrap_content"
            android:layout_weight="1" >

            <ImageView
                android:id="@+id/imgComments"
                android:layout_width="wrap_content"
                android:layout_height="wrap_content"
                android:layout_centerHorizontal="true"
                android:layout_centerInParent="true"
                android:contentDescription="@string/content_description"
                android:src="@drawable/comments" />

            <TextView
                android:layout_width="wrap_content"
                android:layout_height="wrap_content"
                android:layout_toRightOf="@+id/imgComments"
                android:background="@drawable/getbg"
                android:gravity="center"
                android:padding="@dimen/two_dp"
                android:text="+1"
                android:textColor="@android:color/white"
                android:textSize="@dimen/ten_sp" />
        </RelativeLayout>

        <RelativeLayout
            android:layout_width="fill_parent"
            android:layout_height="wrap_content"
            android:layout_weight="1" >

            <ImageView
                android:id="@+id/imgShare"
                android:layout_width="wrap_content"
                android:layout_height="wrap_content"
                android:layout_centerHorizontal="true"
                android:layout_centerInParent="true"
                android:contentDescription="@string/content_description"
                android:src="@drawable/share" />
        </RelativeLayout>
    </LinearLayout>

    <TextView
        android:id="@+id/txtId"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_alignParentLeft="true"
        android:layout_alignParentTop="true"
        android:layout_margin="@dimen/ten_dp"
        android:text="id"
        android:textSize="20dp" />

</RelativeLayout>

And Logcat is,

11-24 18:54:20.354: E/AndroidRuntime(7120): java.lang.ClassCastException: android.widget.RelativeLayout cannot be cast to android.widget.TextView
11-24 18:54:20.354: E/AndroidRuntime(7120):     Adapter.onClick(Fragment.java:342)
11-24 18:54:20.354: E/AndroidRuntime(7120):     at android.view.View.performClick(View.java:4562)
11-24 18:54:20.354: E/AndroidRuntime(7120):     at android.view.View$PerformClick.run(View.java:18918)
11-24 18:54:20.354: E/AndroidRuntime(7120):     at android.os.Handler.handleCallback(Handler.java:808)
11-24 18:54:20.354: E/AndroidRuntime(7120):     at android.os.Handler.dispatchMessage(Handler.java:103)
11-24 18:54:20.354: E/AndroidRuntime(7120):     at android.os.Looper.loop(Looper.java:193)
11-24 18:54:20.354: E/AndroidRuntime(7120):     at android.app.ActivityThread.main(ActivityThread.java:5388)
11-24 18:54:20.354: E/AndroidRuntime(7120):     at java.lang.reflect.Method.invokeNative(Native Method)
11-24 18:54:20.354: E/AndroidRuntime(7120):     at java.lang.reflect.Method.invoke(Method.java:515)
11-24 18:54:20.354: E/AndroidRuntime(7120):     at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:839)
11-24 18:54:20.354: E/AndroidRuntime(7120):     at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:655)
11-24 18:54:20.354: E/AndroidRuntime(7120):     at dalvik.system.NativeStart.main(Native Method)

android.widget.RelativeLayout cannot be cast to android.widget.TextView.... — srinivas, Nov 24 '14 at 13:43
remove the implementation of onclicklistener and write separate view listener for every view it will work. i checked sample code it self... — srinivas, Nov 24 '14 at 13:46
@Pratt TextView strId = (TextView) (((TextView) view.getParent()).findViewById(R.id.txtId)); System.out.println("!!!!!!!!!strId==="+strId.getText().toString()); — Reena, Nov 24 '14 at 13:46
@sri Yes this is error whrn using TextView strId = (TextView) (((TextView) view.getParent()).findViewById(R.id.txtId)); System.out.println("!!!!!!!!!strId==="+strId.getText().toString()); — Reena, Nov 24 '14 at 13:47
@sri Please suggest me and send me demo for write separate view listener for every view. — Reena, Nov 24 '14 at 13:49
use this way viewHolder.imgLike.setOnClickListener(new OnClickListener() { @Override public void onClick(View v) { // TODO Auto-generated method stub Toast.makeText(activity, "title"+arr.get(position).getTitle(), Toast.LENGTH_SHORT).show(); } }); — srinivas, Nov 24 '14 at 13:50

score 2 · Accepted Answer · answered Nov 24 '14 at 13:49

Try with below code:

public class Adapter1 extends BaseAdapter implements OnClickListener {
    public ArrayList<HashMap<String, String>> arr = null;
    Context context = null;
    LayoutInflater layoutInflater = null;
    HashMap<String, String> getData = new HashMap<String, String>();

    String urlLike = null;
    TextView strId = null;

    public NewsFeedAdapter(Context context,
            ArrayList<HashMap<String, String>> arr) {
        this.context = context;
        this.arr= arr;
        layoutInflater = LayoutInflater.from(context);
    }

    @Override
    public int getCount() {
        return arr.size();
    }

    @Override
    public Object getItem(int position) {
        return arr.get(position);
    }

    @Override
    public long getItemId(int position) {
        return position;
    }

    @Override
    public View getView(int position, View convertView, ViewGroup parent) {
        ViewHolder viewHolder = null;
        if (convertView == null) {
            convertView = layoutInflater.inflate(
                    R.layout.my_list_item, null);
            /** initialize ViewHolder */
            viewHolder = new ViewHolder();

            /** Initialize Widgets */
            /** Imageview */

            viewHolder.imgLike = (ImageView) convertView
                    .findViewById(R.id.imgLike);


            viewHolder.imgComments = (ImageView) convertView
                    .findViewById(R.id.imgComments);
            viewHolder.imgComments.setOnClickListener(this);

            viewHolder.imgShare = (ImageView) convertView
                    .findViewById(R.id.imgShare);
            viewHolder.imgShare.setOnClickListener(this);

            /** TextView */
            viewHolder.txtId = (TextView) convertView
                    .findViewById(R.id.txtId);

            viewHolder.txtDescription = (TextView) convertView
                    .findViewById(R.id.txtDescription);

            getData = arr.get(position);
            viewHolder.txtId.setText(getData
                    .get(Fragment1.TAG_ID));

            viewHolder.txtDescription.setText(getData
                    .get(Fragment1.TAG_MESSAGE));

            convertView.setTag(viewHolder);

        } else {
            viewHolder = (ViewHolder) convertView.getTag();
        }

        convertView.setOnClickListener(new OnClickListener() {
            @Override
            public void onClick(View v) {               

            }
        });

         viewHolder.imgLike.setOnClickListener(new OnClickListener() {
            @Override
            public void onClick(View v) {               
                strId=arr.get(position).getId();//or whatever you want to do do here.
            }
        });

        return convertView;
    }

    /** ViewHolder Class */
    public class ViewHolder {
        ImageView imgLike = null, imgComments = null,
                imgShare = null;
        TextView txtId = null,txtDescription = null;
    }
}

@Reena my office time is over now, you can send me source on email, let me solve it and get back to you. — Pratik Dasa, Nov 24 '14 at 13:56
@Reena its okay, you welcome, if above code working fine then please accept and upvote and happy coding!!! — Pratik Dasa, Nov 25 '14 at 04:19

score 1 · Answer 2 · edited Nov 24 '14 at 11:44

1

You need to initialize strId in getView()

here in the following code, its not able to initialize it based on "view" object, hence you get nullpointer.

case R.id.imgLike:
    strId = ((TextView) view.findViewById(R.id.txtId));

mark as solved if you find the answer useful.

edited Nov 24 '14 at 11:44

MysticMagicϡ

28,593
16
73
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answered Nov 24 '14 at 11:40

shahharshil46

172
3
10

score 1 · Answer 3 · answered Nov 24 '14 at 11:41

1

Try this:

strId = (TextView) view.getParent().findViewById(R.id.txtId);

This will fix your crash, but you need to rethink about your design.

answered Nov 24 '14 at 11:41

KR_Android

1,149
9
19

score 1 · Answer 4 · edited Nov 24 '14 at 11:44

1

What u have to do is set Diff onclick Listeners on diff views

viewHolder.txtDescription.setTag(R.id.txtDescription,position);
viewHolder.txtDescription.setOnClickListener(new OnClickListener() {    
    @Override
    public void onClick(View v) {
        int position_clicked=(Integer)v.getTag();               
    }
});

repeat it for every view your want to set listener

edited Nov 24 '14 at 11:44

MysticMagicϡ

28,593
16
73
124

answered Nov 24 '14 at 11:42

Arun Salaria

984
6
20

I am using int position_clicked=(Integer)v.getTag();But It gives Null Pointer Exception. – Reena Nov 24 '14 at 12:02
setTag(R.id.txtDescription,position) use this for every view ,use R.id.txtDescription (i.e id of every view as key ) – Arun Salaria Nov 24 '14 at 12:05
Plz help me. I using the viewHolder.imgMyNewsFeedLike.setTag(R.id.imgMyNewsFeedLike,position); viewHolder.imgMyNewsFeedLike.setOnClickListener(new OnClickListener() {@Override public void onClick(View v) { int position_clicked=(Integer)v.getTag(); System.out.println("!!!!!!!!!!!id====="+position_clicked);} }); Its Give Null Pointer Exception. And I am using this inside View getView() Method. – Reena Nov 24 '14 at 12:25

Akash Moradiya · Answer 5 · 2014-11-24T11:44:54.300

try like this,

@Override
public View getView(int position, View convertView, ViewGroup parent) {
    ViewHolder viewHolder = null;
    if (convertView == null) {
        convertView = layoutInflater.inflate(
                R.layout.my_list_item, null);
        /** initialize ViewHolder */
        viewHolder = new ViewHolder();

        /** Initialize Widgets */
        /** Imageview */

        viewHolder.imgLike = (ImageView) convertView
                .findViewById(R.id.imgLike);
        viewHolder.imgLike.setOnClickListener(this);
        viewHolder.imgLike.setTag(position);

        viewHolder.imgComments = (ImageView) convertView
                .findViewById(R.id.imgComments);
        viewHolder.imgComments.setOnClickListener(this);

        viewHolder.imgShare = (ImageView) convertView
                .findViewById(R.id.imgShare);
        viewHolder.imgShare.setOnClickListener(this);

        /** TextView */
        viewHolder.txtId = (TextView) convertView
                .findViewById(R.id.txtId);

        viewHolder.txtDescription = (TextView) convertView
                .findViewById(R.id.txtDescription);

        getData = arr.get(position);
        viewHolder.txtId.setText(getData
                .get(Fragment1.TAG_ID));

        viewHolder.txtDescription.setText(getData
                .get(Fragment1.TAG_MESSAGE));

        convertView.setTag(viewHolder);

    } else {
        viewHolder = (ViewHolder) convertView.getTag();
    }

    convertView.setOnClickListener(new OnClickListener() {
        @Override
        public void onClick(View v) {               

        }
    });

    return convertView;
}

@Override
    public void onClick(View view) {
        switch (view.getId()) {
        case R.id.imgLike:

        View view = listview.getAdapter().getView(((ImageView)v).getTag(), null, listview);
            txtId = (TextView) view.findViewById(R.id.txtId);

            System.out.println("On Click====="
                    + strId.getText().toString());

            urlLike = "http://www.example.com?id="
                    + strId.getText().toString() + "&user_id="
                    + myDetail.getUserId();

            new sendLikeData().execute();

            break;
        case R.id.imgComments:

            break;
        case R.id.imgShare:

            break;
        default:
            break;
        }
    }

@Pratt, I am using strId = ((TextView)v); then give the error like java.lang.ClassCastException: android.widget.ImageView cannot be cast to android.widget.TextView — Reena, Nov 24 '14 at 11:37
put you adapter in your list class from there you can get listview — Akash Moradiya, Nov 24 '14 at 12:32
View view = listview.getAdapter().getView(((ImageView)v).getTag(), null, listview); in this how to get listview? — Reena, Nov 24 '14 at 12:38
just put your adapter code in your main class where you have declared ListView — Akash Moradiya, Nov 24 '14 at 12:41
@Akash I Put the Adapter Class in main Class then getView Convert into Integer. How to it possible? — Reena, Nov 24 '14 at 12:50

score 0 · Answer 6 · edited Nov 24 '14 at 11:42

0

You can also use onClickListener inside your adapter class.

Look this sample code

viewHolder.imgLike = (ImageView) convertView.findViewById(R.id.imgLike);
viewHolder.imgLike.setOnClickListener(new OnClickListener() {

    @Override
    public void onClick(View arg0) {
        // TODO Auto-generated method stub
        String id = getData.get(Fragment1.TAG_ID);
    }
});

edited Nov 24 '14 at 11:42

MysticMagicϡ

28,593
16
73
124

answered Nov 24 '14 at 11:41

Niranj Patel

32,980
10
97
133

I am this But Its again get NullPointerException – Reena Nov 24 '14 at 12:28

How to get id of particular item of listview in android?

6 Answers6

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