CODEWITHSUNDEEP
javaandroidlistview
SJS
SJS

Reputation: 5667

Listview update is not working after calling notifyDataSetChanged

Listview update is not working after calling notifyDataSetChanged. The user clicks on a build and I update the data but the screen never gets updated? can someone please tell me why maybe the load data is not working?

public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.main);


      list1 = (ListView) findViewById(R.id.ListView01);
      list1.setAdapter(new ArrayAdapter(this, android.R.layout.simple_list_item_1, array));

      final EditText EditMessage = (EditText) findViewById(R.id.editTextWebSite);
      Button button = (Button) findViewById(R.id.button1);

        button.setOnClickListener(new OnClickListener() {
            public void onClick(View v) {
                String website = EditMessage.getText().toString();

                //String returnString = loaddata(website);
                Toast.makeText(v.getContext(),
                        "Updating Information",
                        Toast.LENGTH_LONG).show();  
                setListData();

                BaseAdapter la = (BaseAdapter)list1.getAdapter();
                ((BaseAdapter) la).notifyDataSetChanged() ;

                Toast.makeText(v.getContext(),
                        "Updated",
                        Toast.LENGTH_LONG).show();  

            }
        });



private void setListData()
    {
        String array2[] = { "Iphone", "Tutorials", "Gallery", "Android",    "item 1", "item 2", "item3", "item 4" };
         System.arraycopy(array, 0, array2, 0, array.length);
    }

Upvotes: 2

Views: 1120

Answers (3)

Iven Zhang
Iven Zhang

Reputation: 158

I found the listener method may not run on the UI main thread. You should make sure when you use

adapter.notifyDataSetChanged()

in the UI main thread.So you can use hander to resolve this problem.

Upvotes: 1

Mohammed Azharuddin Shaikh
Mohammed Azharuddin Shaikh

Reputation: 42026

public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.main);

final ArrayAdapter mArrayAdapter=new ArrayAdapter(this, android.R.layout.simple_list_item_1, array);
      list1 = (ListView) findViewById(R.id.ListView01);
      list1.setAdapter(mArrayAdapter);

      final EditText EditMessage = (EditText) findViewById(R.id.editTextWebSite);
      Button button = (Button) findViewById(R.id.button1);

        button.setOnClickListener(new OnClickListener() {
            public void onClick(View v) {
                String website = EditMessage.getText().toString();

                //String returnString = loaddata(website);
                Toast.makeText(v.getContext(),
                        "Updating Information",
                        Toast.LENGTH_LONG).show();  
                setListData();

                mArrayAdapter.notifyDataSetChanged() ;

                Toast.makeText(v.getContext(),
                        "Updated",
                        Toast.LENGTH_LONG).show();  

            }
        });

try this out may helps

Upvotes: 1

superM
superM

Reputation: 8695

Try 

((ArrayAdapter)list1.getAdapter()).notifyDataSetChanged() ;

instead of casting to BaseAdapter.

Upvotes: 1

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