我正在处理一部有ListView部电影的应用程序。该列表在strings.xml中声明为数组。它包含元素Title，Gross和Date Released。当长按行时，它会弹出一个上下文菜单，允许用户编辑所述行或将其删除。当用户选择编辑时，他/她将被带到第二个屏幕，其中包含与Title，Gross和Date对应的3个编辑文本。 EditText字段使用单击行中的数据进行初始化。这是我的代码：
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
String[] titleList = getResources().getStringArray(R.array.title_array);
String[] grossList = getResources().getStringArray(R.array.gross_array);
String[] dateList = getResources().getStringArray(R.array.date_array);
results = new ArrayList<Lab8_082588FetchDetails>();
for (int i = 0; i < titleList.length; i++) {
Lab8_082588FetchDetails sr = new Lab8_082588FetchDetails();
sr.setTitle(titleList[i]);
sr.setGross(grossList[i]);
sr.setDate(dateList[i]);
results.add(sr);
}
adapter = new SampleCustomAdapter(results);
setListAdapter(adapter);
ListView lv = getListView();
lv.setTextFilterEnabled(true);
registerForContextMenu(lv);
}
@Override
public void onCreateContextMenu(ContextMenu menu, View v,
ContextMenuInfo menuInfo) {
// TODO Auto-generated method stub
super.onCreateContextMenu(menu, v, menuInfo);
MenuInflater inflater = getMenuInflater();
// places the contents of the XML to the menu
inflater.inflate(R.menu.context_menu, menu);
}
@Override
public boolean onContextItemSelected(MenuItem item) {
AdapterContextMenuInfo info = (AdapterContextMenuInfo) item
.getMenuInfo();
switch (item.getItemId()) {
case R.id.delete:
results.remove(info.position);
adapter.notifyDataSetChanged();
return true;
case R.id.edit:
System.out.println(info.id);
System.out.println(info.position);
Intent newData = new Intent(Lab8_082588.this, Lab8_082588Edit.class);
results.get(info.position);
TextView movieTitle = (TextView) findViewById(R.id.title);
TextView movieGross = (TextView) findViewById(R.id.gross);
TextView movieDate = (TextView) findViewById(R.id.date);
String startTitle = movieTitle.getText().toString();
String startGross = movieGross.getText().toString();
String startDate = movieDate.getText().toString();
newData.putExtra(Lab8_082588Edit.TITLE_STRING, startTitle);
newData.putExtra(Lab8_082588Edit.GROSS_STRING, startGross);
newData.putExtra(Lab8_082588Edit.DATE_STRING, startDate);
startActivityForResult(newData, Lab8_082588.EDIT_MOVIE);
return true;
default:
return super.onContextItemSelected(item);
}
}
对于编辑屏幕：
public class Lab8_082588Edit extends Activity {
public static final String TITLE_STRING = "TITLE_STRING";
public static final String GROSS_STRING = "GROSS_STRING";
public static final String DATE_STRING = "DATE_STRING";
@Override
protected void onCreate(Bundle savedInstanceState) {
// TODO Auto-generated method stub
super.onCreate(savedInstanceState);
setContentView(R.layout.addedit);
initialize();
}
private void initialize() {
// TODO Auto-generated method stub
Intent prepopulate = getIntent();
EditText movieTitle = (EditText) findViewById(R.id.etTitle);
EditText movieGross = (EditText) findViewById(R.id.etGross);
EditText movieDate = (EditText) findViewById(R.id.etDate);
String startTitle = prepopulate.getStringExtra(Lab8_082588Edit.TITLE_STRING);
String startGross = prepopulate.getStringExtra(Lab8_082588Edit.GROSS_STRING);
String startDate = prepopulate.getStringExtra(Lab8_082588Edit.DATE_STRING);
movieTitle.setText(startTitle);
movieGross.setText(startGross.replaceAll(",", "").replace("$", ""));
movieDate.setText(startDate);
}
我的FetchDetails类
public class Lab8_082588FetchDetails implements Comparable<Lab8_082588FetchDetails> {
private String title;
private String gross;
private String date;
public String getTitle() {
return title;
}
public void setTitle(String title) {
this.title = title;
}
public String getGross() {
return gross;
}
public void setGross(String gross) {
this.gross = gross;
}
public String getDate() {
return date;
}
public void setDate(String date) {
this.date = date;
}
@Override
public int compareTo(Lab8_082588FetchDetails another) {
// TODO Auto-generated method stub
return title.compareTo(another.title);
}
}
我的适配器：
private class SampleCustomAdapter extends BaseAdapter {
public SampleCustomAdapter(ArrayList<Lab8_082588FetchDetails> movies) {
internalList = movies;
}
@Override
public int getCount() {
// TODO Auto-generated method stub
return internalList.size();
}
@Override
public Object getItem(int index) {
// TODO Auto-generated method stub
return internalList.get(index);
}
@Override
public long getItemId(int position) {
// TODO Auto-generated method stub
return position;
}
@Override
public View getView(int position, View convertView, ViewGroup parent) {
LayoutInflater inflater = getLayoutInflater();
View view;
if (convertView == null) {
view = inflater.inflate(R.layout.row, null);
} else {
view = convertView;
}
// extract the views to be populated
TextView title = (TextView) view.findViewById(R.id.title);
TextView gross = (TextView) view.findViewById(R.id.gross);
TextView date = (TextView) view.findViewById(R.id.date);
// extract the object that will fill these
Lab8_082588FetchDetails movie = internalList.get(position);
title.setText(movie.getTitle());
date.setText(movie.getDate());
gross.setText(movie.getGross());
// return the view
return view;
}
}
我的问题是，确实编辑文本已填充，但仅包含整个列表中第一项的数据（例如，泰坦尼克号是列表中的第一项，并且是唯一填充的项目）。即使我单击列表视图中的第n行电影，泰坦尼克号仍然是正在检索的那部。我该如何解决这个问题？
编辑：我意识到，不知何故，代码只考虑列表的第一个元素。如何访问其他行的元素？
答案 0 :(得分：1)
我意识到，不知何故，代码只考虑第一个 列表的元素。如何访问其他行的元素？
对于findViewById行中的项目，您绝不应该使用ListView进行搜索。在onContextItemSelected回调中，您点击了元素的位置，以便您可以使用它来获取与此行相关联的数据：
case R.id.edit:
Intent newData = new Intent(Lab8_082588.this, Lab8_082588Edit.class);
// I hope you implemented the adapter correctly
Lab8_082588FetchDetails item = (Lab8_082588FetchDetails) getListView().getItemAtPosition(info.position);
String startTitle = item.getTitle();
String startGross = item.getGross();
String startDate = item.getDate();
newData.putExtra(Lab8_082588Edit.TITLE_STRING, startTitle);
newData.putExtra(Lab8_082588Edit.GROSS_STRING, startGross);
newData.putExtra(Lab8_082588Edit.DATE_STRING, startDate);
startActivityForResult(newData, Lab8_082588.EDIT_MOVIE);
return true;