ListView opening a Dialog (or alert dialog)

Question

I'm trying to get my list view to open up an alert dialog to display information when a person clicks on a selection. I have been trying several different things on the Google Developers website that have to do with this but have yet to come up with a result. Here is my code.

package table.periodic;

import android.app.Activity; import android.app.AlertDialog; import android.app.Dialog; import android.content.Context; import android.os.Bundle; import android.view.View; import android.widget.AdapterView; import android.widget.ArrayAdapter; import android.widget.ImageView; import android.widget.ListView; import android.widget.AdapterView.OnItemClickListener;

public class Anions extends Activity {      AlertDialog.Builder builder;    AlertDialog alertDialog;        String[] anions ={          "Acetate", "Bromide", "Carbonate", "Chlorate", "Chloride", "Chlorite", "Chromate",              "Cyanide", "Dichromate", "Fluoride", "Hexacyanoferrate(II)", "Hexacyanoferrate(III)",           "Hydride", "Hydrogen Carbonate", "Hydrogen Sulfate", "Hydroxide", "Hypochlorite",           "Iodide", "Nitrate", "Nitrite", "Oxide", "Perchlorate", "Permanganate", "Peroxide",             "Phosphate", "Sulfate", "Sulfide", "Sulfite"    };      public void onCreate(Bundle icicle){        super.onCreate(icicle);         setContentView(R.layout.anions);
                ListView list=(ListView)findViewById(R.id.anionlist);
        list.setTextFilterEnabled(true);

        ArrayAdapter<String> aa=new ArrayAdapter<String>(this, android.R.layout.simple_list_item_1, anions);

        list.setAdapter(aa);

        list.setOnItemClickListener(new OnItemClickListener() {

            public void onItemClick(AdapterView<?> arg0, View arg1, int arg2,
                long arg3) {
                        String itemText = anions[arg2];

        new AlertDialog.Builder(Anions.this);
            Context mContext = getApplicationContext();
            Dialog dialog = new Dialog(mContext);
                dialog.setContentView(R.layout.custom_dialog);
                dialog.setTitle(itemText);

                ImageView image = (ImageView) dialog.findViewById(R.id.image);
                image.setImageResource(R.drawable.hydrogen);



        }

        });
            }

     }

Answer 1

Instead of getApplicationContext() use your activity as context Anions.this

Don't forget to call .create() and .show()

For example this works for me:

new AlertDialog.Builder(this).setTitle(R.string.contact_groups_add)
            .setView(addView).setPositiveButton(R.string.ok,
                    new DialogInterface.OnClickListener() {
                        public void onClick(DialogInterface dialog,
                                int whichButton) {

                        }
                    }).setNegativeButton(R.string.cancel,
                    new DialogInterface.OnClickListener() {
                        public void onClick(DialogInterface dialog,
                                int whichButton) {

                        }
                    }).show();