Android - 单击按钮时将项目添加到自定义列表视图
我目前有一个自定义列表视图,其中列表中的每个项目都包含两行文本。我想做的是每次用户单击该按钮时,它都会使用用户输入的文本在列表上创建一个新项目。虽然我知道如何获取文本,但我在向列表视图添加新项目时遇到了麻烦,因为我根本不知道从哪里开始。
这是我的代码:
public class MainFeedActivity extends ListActivity implements OnClickListener {
View sendButton;
EditText postTextField;
TextView currentTimeTextView, mainPostTextView;
ListView feedListView;
String[] test;
ArrayList<HashMap<String, String>> list;
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.main_feed);
//create button and implement on click listener
sendButton = this.findViewById(R.id.sendPostButton);
sendButton.setOnClickListener(this);
list = new ArrayList<HashMap<String, String>>();
//create the adapter for the list view
SimpleAdapter adapter = new SimpleAdapter(
this,
list,
R.layout.post_layout,
new String[]{"time", "post"},
new int[]{R.id.postTimeTextView, R.id.postTextView});
//fill the list view with something - TEST
fillData();
//set list adapter
setListAdapter(adapter);
}
public void fillData() {
//long timeTest = System.currentTimeMillis();
HashMap<String, String> temp = new HashMap<String, String>();
temp.put("time", "current time");
temp.put("post", "USER TEXT GOES HERE");
list.add(temp);
}
@Override
public void onClick(View button) {
switch (button.getId()) {
case R.id.sendPostButton:
break;
}
}
}
I currently have a custom listview where each item on the list contains two rows of text. What I would like to do is each time a user clicks on the button, it creates a new item on the list with the text that the user inputted. While I know how to get the text, I am having trouble adding a new item to the list view as I simply don't know where to begin.
Here is my code:
public class MainFeedActivity extends ListActivity implements OnClickListener {
View sendButton;
EditText postTextField;
TextView currentTimeTextView, mainPostTextView;
ListView feedListView;
String[] test;
ArrayList<HashMap<String, String>> list;
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.main_feed);
//create button and implement on click listener
sendButton = this.findViewById(R.id.sendPostButton);
sendButton.setOnClickListener(this);
list = new ArrayList<HashMap<String, String>>();
//create the adapter for the list view
SimpleAdapter adapter = new SimpleAdapter(
this,
list,
R.layout.post_layout,
new String[]{"time", "post"},
new int[]{R.id.postTimeTextView, R.id.postTextView});
//fill the list view with something - TEST
fillData();
//set list adapter
setListAdapter(adapter);
}
public void fillData() {
//long timeTest = System.currentTimeMillis();
HashMap<String, String> temp = new HashMap<String, String>();
temp.put("time", "current time");
temp.put("post", "USER TEXT GOES HERE");
list.add(temp);
}
@Override
public void onClick(View button) {
switch (button.getId()) {
case R.id.sendPostButton:
break;
}
}
}
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就像在
ArrayList
中添加新元素一样简单(就像在fillData
中所做的那样),然后调用adapter.notifyDataSetChanged()
。It's as simple as adding a new element to your
ArrayList
(like you do infillData
), then callingadapter.notifyDataSetChanged()
.调用 fillData() 后,只需调用
adapter.notifyDataSetChanged()
即可。NotifyDataSetChanged() - 通知附加视图基础数据已更改,它应该自行刷新。
After calling fillData(), just make a call on
adapter.notifyDataSetChanged()
.NotifyDataSetChanged() - Notifies the attached View that the underlying data has been changed and it should refresh itself.