Android OnItemCLickListener 在 ListView 中不起作用

Question

我是 android 编程的新手。我正在开发一个应用程序，当用户点击任何 ListView 项目时，它应该转到 Google map 应用程序并在 map 上显示该地址的图钉。但是当我点击任何项目时，什么也没有发生。 以下是我的显示 Activity 。

public class DisplayActivity extends Activity implements OnItemClickListener{

ListView listView;
private String tag_name; 
public List<NameAddress> nameAddressList;
@Override
protected void onCreate(Bundle savedInstanceState) {

    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_display);

    listView = (ListView) findViewById(R.id.list);

    Intent intent = getIntent();
    if(intent!= null)
    {
        tag_name = intent.getStringExtra("DashItemName");
        setTitle("List of " +tag_name+ " addresses");
    }

    nameAddressList = null;
    try {
            XMLDOMParserHandler parser = new XMLDOMParserHandler(tag_name);
        nameAddressList = parser.parseXML(getAssets().open("data.xml"));
        ArrayAdapter<NameAddress> adapter =
            new ArrayAdapter<NameAddress>(this,R.layout.list_item, nameAddressList);
        listView.setAdapter(adapter);

    } catch (IOException e) {
        e.printStackTrace();
    }
}

@Override
public boolean onCreateOptionsMenu(Menu menu) {
    // Inflate the menu; this adds items to the action bar if it is present.
    getMenuInflater().inflate(R.menu.display, menu);
    return true;
}


@Override
public void onItemClick(AdapterView<?> parent, View view, int position, long id)
{
    // Build the intent
    String address = nameAddressList.get(position).toString();
    address = "geo:0,0?q=" + address;
    String query = URLEncoder.encode(address, "utf-8");
    Uri location = Uri.parse(query);
    Intent mapIntent = new Intent(Intent.ACTION_VIEW, location;
    mapIntent.setClassName("com.google.android.apps.maps", "com.google.android.maps.MapsActivity");

    // Verify it resolves
    PackageManager packageManager = getPackageManager();
    List<ResolveInfo> activities = packageManager.queryIntentActivities(mapIntent, 0);
    boolean isIntentSafe = activities.size() > 0;

    // Start an activity if it's safe
    if (isIntentSafe) {
        startActivity(mapIntent);
    }
    else
    {
        Toast.makeText(this, "Please install google maps app", Toast.LENGTH_LONG).show();
    }

} 

}

请给我一个解决这个问题的方法。

Answer 1

Please suggest me a way to solve this problem.

它对你不起作用，因为你忘记为 ListView 分配监听器:

@Override
protected void onCreate(Bundle savedInstanceState) {

    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_display);

    listView = (ListView) findViewById(R.id.list);
    listView.setOnItemClickListener(this);

    ...
}

现在，它会为你工作。