Java 尝试在我的ListView中显示带有toast功能的按钮
如何在我的Java 尝试在我的ListView中显示带有toast功能的按钮,java,android,button,toast,Java,Android,Button,Toast,如何在我的应用程序中使用Toast功能添加按钮,以及在何处添加按钮 我知道很多时候有人问我这个问题,但我还是很困惑,所以有人能帮我 [正文] [按钮1][按钮2] [正文] [按钮1][按钮2] 这是我的密码: public class EngineerRecycler extends AppCompatActivity { String service_id,type, jsonStr; String compticketid; private String TAG = MainActivit
应用程序中使用Toast功能添加按钮
,以及在何处添加按钮
我知道很多时候有人问我这个问题,但我还是很困惑,所以有人能帮我
[正文]
[按钮1][按钮2]
[正文]
[按钮1][按钮2]
这是我的密码:
public class EngineerRecycler extends AppCompatActivity {
String service_id,type, jsonStr;
String compticketid;
private String TAG = MainActivity.class.getSimpleName();
private ListView lv;
// URL to get contacts JSON
private static String urlpending = "http://localhost/players.php";
ArrayList<HashMap<String, String>> contactList;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate( savedInstanceState );
setContentView( R.layout.activity_engineer_recycler );
Bundle bundle = getIntent().getExtras();
service_id = bundle.getString( "empid" );
type = bundle.getString( "type" );
contactList = new ArrayList<>();
lv = (ListView) findViewById(R.id.list);
new GetContacts().execute();
}
private class GetContacts extends AsyncTask<Void, Void, Void> {
@Override
protected void onPreExecute() {
super.onPreExecute();
}
@Override
protected Void doInBackground(Void... arg0) {
HttpHandler sh = new HttpHandler();
// Making a request to URL and getting a response
jsonStr = sh.makeServiceCall( urlpending, service_id );
if (jsonStr != null) {
try {
JSONObject jsonObj = new JSONObject(jsonStr);
// Getting JSON Array node
JSONArray contacts = jsonObj.getJSONArray("contacts");
// looping through All Contacts
for (int i = 0; i < contacts.length(); i++) {
JSONObject c = contacts.getJSONObject(i);
String name = c.getString("ClientName");
String email = c.getString("comp_desc");
// tmp hash map for single contact
HashMap<String, String> contact = new HashMap<>();
// adding each child node to HashMap key => value
contact.put("ClientName", name);
contact.put("comp_desc", email);
// adding contact to contact list
contactList.add(contact);
}
} catch (final JSONException e) {
Log.e(TAG, "Json parsing error: " + e.getMessage());
runOnUiThread(new Runnable() {
@Override
public void run() {
Toast.makeText(getApplicationContext(),
"Json parsing error: " + e.getMessage(),
Toast.LENGTH_LONG)
.show();
}
});
}
} else {
Log.e(TAG, "Couldn't get json from server.");
runOnUiThread(new Runnable() {
@Override
public void run() {
Toast.makeText(getApplicationContext(),
"Couldn't get json from server. Check LogCat for possible errors!",
Toast.LENGTH_LONG)
.show();
}
});
}
return null;
}
@Override
protected void onPostExecute(Void result) {
super.onPostExecute(result);
ListAdapter adapter = new SimpleAdapter(
EngineerRecycler.this, contactList,
R.layout.list_pending, new String[]{"ClientName", "comp_desc"}, new int[]{R.id.name,
R.id.email);
lv.setAdapter( adapter );
}
}
}
}
欢迎来到Stackoverflow
在了解您的需求后。这是解决办法
首先在模型类中使用布尔值
现在将此布尔值附加到适配器中的按钮可见性getView()
现在,当您要更改可见的按钮时。只要改变这个布尔值
并通知列表进行数据更改
这将使2索引按钮可见。如果你感到困惑
任何地方,请问我
与您的问题相关。只是不同的是-在这个答案中,这个家伙将复选框附加到模型上。并将可见性附加到模式
暗示
使用,因为这有很多性能方面的特性
类似于notifyItemDataChanged()
只通知已更改的项目,无论是否在ListView中所有项目都将不生效。添加此方法
lv.setOnItemClickListener(new AdapterView.OnItemClickListener() {
@Override
public void onItemClick(AdapterView<?> adapterView, View view, int i, long l) {
//You can find your button here
if(view instanceof Button)
{
if(view.getId() == R.id.getenter)
{
Toast.makeText(getApplicationContext(),"toast_msg",Toast.LENGTH_LONG).show();
}
}
}
});
你不清楚你在问什么。简而言之,如何在我的列表视图中添加按钮你想要一个按钮作为单独的项目。或者您希望按钮在现有项中可见?在现有项中可见,但使用toast功能,您需要创建一个自定义行(xml文件),并根据需要进行设计(文本+按钮),然后将其应用于Listview。。。互联网上有很多关于如何做到这一点的例子;我必须写setonItemClickListerner();-@Mohamed MohaideenYes您必须在setadapter之后添加此方法,并从类列表\u pending
中查找该方法内部的任何视图。。并执行操作。我复制粘贴了相同的代码,但没有显示toast消息。您可以放置断点并检查if循环的条件是否正常。实际上,按钮不起作用,只是我尝试放置了其他内容
class Model {
boolean buttonVisible;
// settter getter
}
holder.button.setVisibility(model.isButtonVisible() ? View.VISIBLE : View.GONE);
yourList.get(2).setButtonVisible(true);
((BaseAdapter) listView.getAdapter()).notifyDataSetChanged();
lv.setOnItemClickListener(new AdapterView.OnItemClickListener() {
@Override
public void onItemClick(AdapterView<?> adapterView, View view, int i, long l) {
//You can find your button here
if(view instanceof Button)
{
if(view.getId() == R.id.getenter)
{
Toast.makeText(getApplicationContext(),"toast_msg",Toast.LENGTH_LONG).show();
}
}
}
});
lv.setadapter(adpater);