Question

我有一个列表视图，其中包含2个文本视图和3个按钮，我想点击其中一个按钮但在哪里写按钮的OnclickListener时会做什么？！

我的java类

       public class AdminGlossary extends ListActivity {


// Progress Dialog
private ProgressDialog pDialog;

// Creating JSON Parser object
JSONParser jParser = new JSONParser();

ArrayList<HashMap<String, String>> productsList;

// url to get all products list
private static String url_all_products = "http://www.lamia.byethost18.com/get_all_glossaries.php";
private static final String url_delete_product = "http://www.lamia.byethost18.com/delete_product.php";

// JSON Node names
private static final String TAG_SUCCESS = "success";
private static final String TAG_PRODUCTS = "products";
private static final String TAG_PID = "ID_glossary";
private static final String TAG_NAME = "name";
private static final String TAG_DES = "description";
private static final String TAG_CHA = "ID_chapter";

String pid="0";


// products JSONArray
JSONArray products = null;

JSONParser jsonParser = new JSONParser();


@Override
public void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_admin_glossary);


    // Hashmap for ListView
    productsList = new ArrayList<HashMap<String, String>>();

    // Loading products in Background Thread
    new LoadAllProducts().execute();

    // Get listview
    ListView lv = getListView();

    // on seleting single product
    // launching Edit Product Screen
    /*lv.setOnItemClickListener(new OnItemClickListener() {

        @Override
        public void onItemClick(AdapterView<?> parent, View view,
                int position, long id) {
            // getting values from selected ListItem
            String pid = ((TextView) view.findViewById(R.id.pid)).getText()
                    .toString();

            // Starting new intent
            Intent in = new Intent(getApplicationContext(),
                    EditProductActivity.class);
            // sending pid to next activity
            in.putExtra(TAG_PID, pid);

            // starting new activity and expecting some response back
            startActivityForResult(in, 100);
        }
    });*/

}

// Response from Edit Product Activity
@Override
protected void onActivityResult(int requestCode, int resultCode, Intent data) {
    super.onActivityResult(requestCode, resultCode, data);
    // if result code 100
    if (resultCode == 100) {
        // if result code 100 is received 
        // means user edited/deleted product
        // reload this screen again
        Intent intent = getIntent();
        finish();
        startActivity(intent);
    }

}

/**
 * Background Async Task to Load all product by making HTTP Request
 * */
class LoadAllProducts extends AsyncTask<String, String, String> {

    /**
     * Before starting background thread Show Progress Dialog
     * */
    @Override
    protected void onPreExecute() {
        super.onPreExecute();
        pDialog = new ProgressDialog(AdminGlossary.this);
        pDialog.setMessage("Loading products. Please wait...");
        pDialog.setIndeterminate(false);
        pDialog.setCancelable(false);
        pDialog.show();
    }

    /**
     * getting All products from url
     * */
    protected String doInBackground(String... args) {
        // Building Parameters
        List<NameValuePair> params = new ArrayList<NameValuePair>();
        // getting JSON string from URL
        JSONObject json = jParser.makeHttpRequest(url_all_products, "GET", params);

        // Check your log cat for JSON reponse
        Log.d("All Products: ", json.toString());

        try {
            // Checking for SUCCESS TAG
            int success = json.getInt(TAG_SUCCESS);

            if (success == 1) {
                // products found
                // Getting Array of Products
                products = json.getJSONArray(TAG_PRODUCTS);

                // looping through All Products
                for (int i = 0; i < products.length(); i++) {
                    JSONObject c = products.getJSONObject(i);

                    // Storing each json item in variable
                    String id = c.getString(TAG_PID);
                    String name = c.getString(TAG_NAME);
                    String des = c.getString(TAG_DES);
                    String cha = c.getString(TAG_CHA);

                    // creating new HashMap
                    HashMap<String, String> map = new HashMap<String, String>();

                    // adding each child node to HashMap key => value
                    map.put(TAG_PID, id);
                    map.put(TAG_NAME, name);
                    map.put(TAG_DES, des);
                    map.put(TAG_CHA, cha);

                    // adding HashList to ArrayList
                    productsList.add(map);
                }
            } else {
                // no products found
                // Launch Add New product Activity
                Intent i = new Intent(getApplicationContext(),
                        NewProductActivity.class);
                // Closing all previous activities
                i.addFlags(Intent.FLAG_ACTIVITY_CLEAR_TOP);
                startActivity(i);
            }
        } catch (JSONException e) {
            e.printStackTrace();
        }

        return null;
    }

    /**
     * After completing background task Dismiss the progress dialog
     * **/
    protected void onPostExecute(String file_url) {
        // dismiss the dialog after getting all products
        pDialog.dismiss();
        // updating UI from Background Thread
        runOnUiThread(new Runnable() {
            public void run() {

                /**
                 * Updating parsed JSON data into ListView
                 * */
                ListAdapter adapter = new SimpleAdapter(
                        AdminGlossary.this, productsList,
                        R.layout.list_item_2, new String[] { TAG_PID,
                                TAG_NAME, TAG_DES, TAG_CHA},
                        new int[] { R.id.pid, R.id.name, R.id.des, R.id.cha });

                // updating listview
                setListAdapter(adapter);
            }
        });
    }}

我的list_item_2.xml

   <?xml version="1.0" encoding="utf-8"?>
   <RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
       android:layout_width="fill_parent"
       android:layout_height="wrap_content"
       android:orientation="vertical" >

<TextView
    android:id="@+id/name"
    android:layout_width="106dp"
    android:layout_height="wrap_content"
    android:layout_alignParentLeft="true"
    android:layout_alignParentTop="true"
    android:paddingLeft="6dip"
    android:paddingTop="6dip"
    android:text="@string/ddd"
    android:textSize="17dip"
    android:textStyle="bold" />

<TextView
    android:id="@+id/des"
    android:layout_width="76dp"
    android:layout_height="wrap_content"
    android:layout_alignParentTop="true"
    android:layout_toRightOf="@+id/name"
    android:paddingLeft="6dip"
    android:paddingTop="6dip"
    android:text="@string/dd"
    android:textSize="17dip"
    android:textStyle="bold" />

<Button
    android:id="@+id/cha"
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:layout_alignParentTop="true"
    android:layout_toRightOf="@+id/des"
    android:background="@null"
    android:text="@string/d"
    android:textColor="#0000ff"
    android:textSize="15sp" />

<Button
    android:id="@+id/deletee"
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:layout_alignBottom="@+id/name"
    android:layout_alignParentRight="true"
    android:layout_alignParentTop="true"
    android:text="Button"
    android:textSize="15dp" />

<Button
    android:id="@+id/editt"
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:layout_alignBottom="@+id/cha"
    android:layout_alignParentRight="true"
    android:layout_below="@+id/deletee"
    android:text="Button"
    android:textSize="15dp" />

   </RelativeLayout>

有人可以帮帮我吗？

谢谢.. :)）

Answer 1

有几种方法可以做到这一点：

1。）设置＆＃34; android：onClick＆＃34;布局文件中每个按钮的属性指向要调用的方法。它看起来像这样：

<Button
android:id="@+id/cha"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignParentTop="true"
android:layout_toRightOf="@+id/des"
android:background="@null"
android:text="@string/d"
android:textColor="#0000ff"
android:textSize="15sp" 
android:onClick="<methodname>"/>

2。）在ListView的适配器中生成每个按钮时，为每个按钮设置onClickListener。

希望这有帮助！

Answer 2

在BaseAdapter类中添加按钮的侦听器。下面是一个示例代码。如果在列表视图中单击按钮，我将执行一些操作。

public class People_Adapter extends BaseAdapter {
    private LayoutInflater inflater = null;
    private ImageButton delete_contact;
    private Context context;

    @Override
    public int getCount() {
        return list.size() / 2;
    }

    @Override
    public Object getItem(int position) {
        return position;
    }

    @Override
    public long getItemId(int position) {
        return position;
    }

    @Override
    public View getView(int position, final View convertView, ViewGroup parent) {

        if(convertView == null)
        {
           convertView = LayoutInflater.from(parent.getContext()).inflate(R.layout.my list_item_2, parent, false);
           delete_contact = (ImageButton) convertView.findViewById(R.id.excl_ppl_delete);

           delete_contact.setOnClickListener(new View.OnClickListener() {
               @Override
               public void onClick(View v) {
                      //Add code here what needs to be done onclick
               });  
        }


        return convertView;
    }
}

ListView中的项目 - android

2 个答案: