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tripossi
Asked: 2020-02-15 04:41:16 +0800 CST 2020-02-15 04:41:16 +0800 CST

How can I launch an intent by clicking on the child element of an expandable List?

  • 772

I want to launch an intent but it gives me an error and I can't find the reason. Any suggestions. It gives me the error when creating the intent:

 @Override
public View getChildView(int groupPosition, final int childPosition,
                         boolean isLastChild, View convertView, ViewGroup parent) {
    tempChild = (ArrayList<String>) Childtem.get(groupPosition);
    TextView text = null;
    if (convertView == null) {
        convertView = minflater.inflate(R.layout.childrow, null);
    }
    text = (TextView) convertView.findViewById(R.id.textView1);
    text.setText(tempChild.get(childPosition));
    convertView.setOnClickListener(new View.OnClickListener() {
        @Override
        public void onClick(View v) {
            dato = tempChild.get(childPosition);
            Toast.makeText(activity, dato,
                    Toast.LENGTH_SHORT).show();
            Intent intent = new Intent(NewAdapter.this, Ficha.class);
            intent.putExtra("id", id);
            activity.startActivity(intent);
        }
    });
    return convertView;
}

NewAdapter.java is a class that extends from BaseExpandableListAdapter.

android

2 Answers

  1. Best Answer

    You are using the adapter as the context of the intent. I assume that 'activity' is the activity from which the adapter is called, so it would look like this:

    Intent intent = new Intent(activity, Ficha.class);
intent.putExtra("id", id);
activity.startActivity(intent);
    • 2

  2. What is definitely needed is the context of the Activity :

    //Intent intent = new Intent(NewAdapter.this, Ficha.class);
Intent intent = new Intent(activity, Ficha.class);
intent.putExtra("id", id);
activity.startActivity(intent);

    but it is important to mention that to do this, since it is done inside a class that extends from BaseExpandableListAdapter:

    public class NewAdapter extends BaseExpandableListAdapter {

    you need a method that receives the context and that method is setInflater():

    public Activity activity;

public void setInflater(LayoutInflater mInflater, Activity act) {
    this.minflater = mInflater;
    activity = act;
}

    The class must receive the context in some way to use it in the Intent.

    • 2