Android ListView：在不使用点击事件的情况下获取项目文本

Question

Is there a way to get the value of TextView which is an item of a ListView without using any click event ?

<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:orientation="horizontal">

    <TextView
        android:id="@+id/friendNoTv"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:visibility="gone" />

    <ImageView
        android:id="@+id/friendImage"
        android:layout_width="80dp"
        android:layout_height="80dp"
        android:layout_alignParentLeft="true"
        android:layout_centerVertical="true" />

    <TextView
        android:id="@+id/friendFullName"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_centerVertical="true"
        android:layout_gravity="center_vertical"
        android:layout_marginLeft="10dp"
        android:layout_toRightOf="@+id/friendImage"
        android:textColor="#0D47A1" />

    <ImageButton
        android:id="@+id/addFriendButton"
        android:layout_width="50dp"
        android:layout_height="50dp"
        android:layout_alignParentRight="true"
        android:layout_marginEnd="5dp"
        android:layout_marginRight="5dp"
        android:layout_marginTop="5dp"
        android:background="@drawable/add_friend" />

    <TextView
        android:id="@+id/addFriendTv"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_alignParentRight="true"
        android:layout_below="@+id/addFriendButton"
        android:layout_marginTop="5dp"
        android:text="ADD FRIEND"
        android:textColor="#0D47A1"
        android:textSize="10sp" />

</RelativeLayout>

My custom row layout defined as above and i need to get the value of the friendNoTv TextView without any click event. I tried it as

@Override
public View getView(int index, final View convertView, ViewGroup parent) {

    // check if we need to generate a new View from scratch or recycle one
    View InflatedView = convertView;
    if (InflatedView == null) {
        InflatedView = Inflater.inflate(R.layout.find_friends_result_row, parent, false);
    }

    // setup variables

    final TextView friendNo = (TextView) InflatedView.findViewById(R.id.friendNoTv);
    ImageView friendImage = (ImageView) InflatedView.findViewById(R.id.friendImage);
    TextView friendFullName = (TextView) InflatedView.findViewById(R.id.friendFullName);
    ImageButton addFriendButton = (ImageButton) InflatedView.findViewById(R.id.addFriendButton);

    //Exception here, friendNo.getText().toString() comes up NULL
    final int friendId = Integer.parseInt(friendNo.getText().toString());

    if(isFriend(friendId)){
        addFriendButton.setVisibility(View.GONE);
    }else{
        addFriendButton.setVisibility(View.VISIBLE);
    }

    //TODO

    Friend friend = friendList.get(index);

    DataFormatter dataFormatter = new DataFormatter();

    friendNo.setText(Integer.toString(friend.getBorNo()));
    dataFormatter.decodeimage(friend.getUserImage(),friendImage);
    friendFullName.setText(friend.getFullName());

    return InflatedView;

}

But value comes up Null which causes an Exception . How do i fix this ? Any help would be appreiated.

Answer 1

Remove android:visibility="gone" from

<TextView
    android:id="@+id/friendNoTv"
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:visibility="gone" />

and also add text to above text view

for example

android:text="1"

Answer 2

You are getting null because you just have inflated the view and you are trying to get the text before setting it. In your XML you haven't set any text value that's why you are getting nothing there.

Just replace that line which is giving null with below one,

 final int friendId = Integer.parseInt(friendList.get(index).getFriendId.toString());

Answer 3

Your code here:

//Exception here, friendNo.getText().toString() comes up NULL
 final int friendId = Integer.parseInt(friendNo.getText().toString());

will definitely be null as friendNo is not set yet. you should paste these line at last just before return statement with the conditional statement.