java - OnClickListener 用于从 ListView 行启动 Web View

Question

搜索 api 返回一些元数据以及 URL“eventURL”。我将数据放置在 ListView 中，每行包含一些数据和一个唯一的 URL。我希望当用户点击 ListView 中的行时，该唯一的 URL 应该在 web View 中打开。我已经为它创建了一个 WebViewActivity，我在实现 onClickListener 时遇到问题。

主要 Activity

public class MainActivity extends Activity {

//private EditText m_search_text;
private EditText m_zip;
private ListView m_search_results;
private Button m_search_btn;
private JSONArray m_results; 
private LayoutInflater m_inflater;
private InputMethodManager m_ctrl;
private Spinner m_radius;
private Spinner m_activity_selector;
public static int radius = 0;
public static String activities;



static final private int EXIT_ID = Menu.FIRST;



@Override
public void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);

    setContentView(R.layout.main);
   // m_search_text = (EditText) findViewById(R.id.search_text);
    m_zip = (EditText) findViewById(R.id.zip);
    m_search_btn = (Button) findViewById(R.id.search_button);
   // m_search_results = (ListView) findViewById(R.id.lview);
    m_search_btn .setOnClickListener(go_handler);

    m_ctrl = (InputMethodManager) getSystemService(Context.INPUT_METHOD_SERVICE);
    m_inflater = LayoutInflater.from(this);
    addListenerOnSpinnerItemSelection();
    addListenerOnSpinner1ItemSelection();

  m_search_results = (ListView)findViewById(R.id.lview);

}

public void addListenerOnSpinnerItemSelection() {
    m_radius = (Spinner) findViewById(R.id.spinner);
    m_radius.setOnItemSelectedListener(new CustomOnItemSelectedListener());
  }

public void addListenerOnSpinner1ItemSelection(){
    m_activity_selector = (Spinner) findViewById(R.id.spinner1);
    m_activity_selector.setOnItemSelectedListener(new ActivitySelectedListener());
    }

@Override
public boolean onCreateOptionsMenu(Menu menu){
    super.onCreateOptionsMenu(menu);

    menu.add(0, EXIT_ID, 0, R.string.exit);
    return true;
    }
@Override
public boolean onOptionsItemSelected (MenuItem item){

    switch (item.getItemId()){
    case EXIT_ID:
        finish();
        return true;

    }

    return super.onOptionsItemSelected(item);

}



OnClickListener go_handler = new OnClickListener() {

    @Override
    public void onClick(View v) {
        // TODO Auto-generated method stub
        m_ctrl.hideSoftInputFromWindow(m_zip.getWindowToken(), 0);

        //String searchText = Uri.encode(m_search_text.getText().toString());
        String zip = Uri.encode(m_zip.getText().toString());

        new SearchTask().execute("?k=Fall+Classic" + "&m=meta:channel=" + activities + "&l="+ zip + "&r=" + radius);
        // Show a toast showing the search text
        Toast.makeText(getApplicationContext(),
                getString(R.string.search_msg) + " " + 
                activities, Toast.LENGTH_LONG).show();
    }
};

private class SearchTask extends AsyncTask<String, Integer, String>
{

    ProgressDialog dialog;

        @Override
        protected void onPreExecute() {

            dialog = ProgressDialog.show(MainActivity.this,"","Please Wait...");

            super.onPreExecute();
        }

        @Override
        protected String doInBackground(String... params) {
            try {
                String result = ActiveHelper.download(params [0]);
                return result;
            } catch (ApiException e) {
                e.printStackTrace();
                Log.e("alatta", "Problem making search request");
            }
            return "";
        }
        @Override
        protected void onPostExecute(String result) {
            dialog.hide();
            try {
                JSONObject obj = new JSONObject(result);
                m_results = obj.getJSONArray("_results");
                if (m_results == null ||m_results.length() == 0)
                {
                    Toast.makeText(getApplicationContext(),
                            "No Results found for " + activities, 
                            Toast.LENGTH_LONG).show();

                }
                else
                    m_search_results.setAdapter(new JSONAdapter(getApplicationContext()));
            } catch (JSONException e) {
                e.printStackTrace();
            }
        }
    }

private class JSONAdapter extends BaseAdapter
{
    public JSONAdapter(Context c){

    }

    public int getCount() 
    {
    return  m_results.length();
        }

    public Object getItem(int arg0){
        return null;
    }

    public long getItemId(int pos){
        return pos;

    }

    public View getView(int pos, View convertView, ViewGroup parent) {
        View tv;
        TextView t;

        if (convertView == null)
            tv = m_inflater.inflate (R.layout.item, parent, false);
        else
            tv = convertView;
        try {
            /* For each entry in the ListView, we need to populate 
             * its text and timestamp */
            t = (TextView) tv.findViewById(R.id.text);
            JSONObject obj = m_results.getJSONObject(pos);

            t.setText (obj.getString("title").replaceAll("\\<.*?\\>", ""));

            t = (TextView) tv.findViewById(R.id.created_at);
            JSONObject meta = obj.getJSONObject("meta");
            t.setText ("When:" + "\t"+meta.getString("startDate")+"\n"+"Location:" +"\t" +meta.getString("location")+"\n" +"More Info:"+"\t" +meta.getString("eventURL")+"\n");


        } catch (JSONException e) {

            Log.e("alatta", e.getMessage());
        }
        return tv;
    }
}}

WebViewActivity

公共(public)类 WebViewActivity 扩展了 MainActivity {

    private WebView webView;

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

        webView = (WebView) findViewById(R.id.webView);
        webView.getSettings().setJavaScriptEnabled(true);
        webView.loadUrl("url");

    }}

谢谢。

Answer 1

您需要使用OnItemClickListener:

MainActivity implements OnItemClickListener {

onCreate() {
m_search_results.setOnItemClickListener(this);

制作这个方法:

onItemClick(AdapterView<?> parent, View view, int position, long id) {

url = JSON.getHowever(position);

//get the intent, load the url, and launch the activity

}

您还需要处理 WebViewActivity 中的 Intent ，但这不是问题