我正在尝试将对象的arraylist从一个活动传递到另一个活动，如下所示：
Intent searchOk = new Intent(EmployeeSearch.this, EmployeeSearchResults.class);
//searchOk.p
searchOk.putParcelableArrayListExtra("Employees", searchEmps);
startActivity(searchOk);
I have created one POJO class that implements parcelable interface like below :
public class SearchedEmployees implements Parcelable{
String empID = "";
String empFName = "";
String empLName = "";
int listPosition = 0;
public SearchedEmployees(String empID, String empFName, String empLName)
{
super();
this.empID = empID;
this.empFName = empFName;
this.empLName = empLName;
}
public String getEmpID() {
return empID;
}
public void setEmpID(String empID) {
this.empID = empID;
}
public String getEmpFName() {
return empFName;
}
public void setEmpFName(String empFName) {
this.empFName = empFName;
}
public String getEmpLName() {
return empLName;
}
public void setEmpLName(String empLName) {
this.empLName = empLName;
}
public int getListPosition() {
return listPosition;
}
public void setListPosition(int listPosition) {
this.listPosition = listPosition;
}
@Override
public int describeContents() {
// TODO Auto-generated method stub
return 0;
}
@Override
public void writeToParcel(Parcel dest, int flags) {
// TODO Auto-generated method stub
dest.writeString(this.empID);
dest.writeString(this.empFName);
dest.writeString(this.empLName);
}
public static final Parcelable.Creator<SearchedEmployees> CREATOR = new Parcelable.Creator<SearchedEmployees>() {
@Override
public SearchedEmployees createFromParcel(Parcel in) {
// TODO Auto-generated method stub
return new SearchedEmployees(in);
}
@Override
public SearchedEmployees[] newArray(int size) {
// TODO Auto-generated method stub
return new SearchedEmployees[size];
}
};
private SearchedEmployees(Parcel in)
{
this.empID = in.readString();
this.empFName = in.readString();
this.empLName = in.readString();
}
}
And in the next activity I have to display the passed arraylist of objects in list view. I am like below:
private void displayListView(){
Bundle b = getIntent().getExtras();
empsSearched = b.getParcelableArrayList("Employees");
System.out.println("No. of Objects Passed :" + empsSearched.size());
empList = (ListView) findViewById(R.id.empSearchList);
//adapter = new CustomAdapter2(EmployeeSearchResults.this, R.layout.employee_search_list_item, empsSearched);
dataAdapter = new MyCustomAdapter(this, R.layout.employee_search_list_item, empsSearched);
empList.setAdapter(dataAdapter);
}
private class MyCustomAdapter extends ArrayAdapter<SearchedEmployees>{
private ArrayList<SearchedEmployees> emps;
public MyCustomAdapter(Context context,
int empSearchListItem, ArrayList<SearchedEmployees> empsSearched) {
// TODO Auto-generated constructor stub
super(context, empSearchListItem, empsSearched);
this.emps = new ArrayList<SearchedEmployees>();
this.emps.addAll(empsSearched);
//this.emps = empsSearched;
System.out.println("In Adapter: " + emps.size());
}
public class ViewHolder{
TextView empID = null;
TextView empName = null;
}
@Override
public View getView(int position, View convertView, ViewGroup parent)
{
ViewHolder holder;
if(convertView == null){
LayoutInflater li = (LayoutInflater) getSystemService(Context.LAYOUT_INFLATER_SERVICE);
convertView = li.inflate(R.layout.employee_search_list_item, null);
holder = new ViewHolder();
holder.empID = (TextView) convertView.findViewById(R.id.txtEmpSearchEmpID);
holder.empName = (TextView) convertView.findViewById(R.id.txtEmpSearchEmpName);
convertView.setTag(holder);
}
else
holder = (ViewHolder) convertView.getTag();
final SearchedEmployees semps = emps.get(position);
if (semps != null)
{
semps.setListPosition(position);
holder.empID.setText(semps.getEmpID());
holder.empName.setText(semps.getEmpFName() + "" + semps.getEmpLName());
}
return convertView;
}
}
我收到错误：
holder.empID.setText(semps.getEmpID());
holder.empName.setText(semps.getEmpFName() + "" + semps.getEmpLName());
日志详细信息如下：
09-30 18:19:13.260: ERROR/AndroidRuntime(1376): at com.XXXXXX.XXXXXXX.EmployeeSearchResults$MyCustomAdapter.getView(EmployeeSearchResults.java:124)
09-30 18:19:13.260: ERROR/AndroidRuntime(1376): at android.widget.AbsListView.obtainView(AbsListView.java:1315)
09-30 18:19:13.260: ERROR/AndroidRuntime(1376): at android.widget.ListView.measureHeightOfChildren(ListView.java:1198)
09-30 18:19:13.260: ERROR/AndroidRuntime(1376): at android.widget.ListView.onMeasure(ListView.java:1109)
09-30 18:19:13.260: ERROR/AndroidRuntime(1376): at android.view.View.measure(View.java:8171)
09-30 18:19:13.260: ERROR/AndroidRuntime(1376): at android.view.ViewGroup.measureChildWithMargins(ViewGroup.java:3132)
09-30 18:19:13.260: ERROR/AndroidRuntime(1376): at android.widget.LinearLayout.measureChildBeforeLayout(LinearLayout.java:1012)
09-30 18:19:13.260: ERROR/AndroidRuntime(1376): at android.widget.LinearLayout.measureVertical(LinearLayout.java:381)
09-30 18:19:13.260: ERROR/AndroidRuntime(1376): at android.widget.LinearLayout.onMeasure(LinearLayout.java:304)
09-30 18:19:13.260: ERROR/AndroidRuntime(1376): at android.view.View.measure(View.java:8171)
09-30 18:19:13.260: ERROR/AndroidRuntime(1376): at android.view.ViewGroup.measureChildWithMargins(ViewGroup.java:3132)
09-30 18:19:13.260: ERROR/AndroidRuntime(1376): at android.widget.FrameLayout.onMeasure(FrameLayout.java:245)
09-30 18:19:13.260: ERROR/AndroidRuntime(1376): at android.view.View.measure(View.java:8171)
09-30 18:19:13.260: ERROR/AndroidRuntime(1376): at android.view.ViewGroup.measureChildWithMargins(ViewGroup.java:3132)
09-30 18:19:13.260: ERROR/AndroidRuntime(1376): at android.widget.FrameLayout.onMeasure(FrameLayout.java:245)
09-30 18:19:13.260: ERROR/AndroidRuntime(1376): at android.view.View.measure(View.java:8171)
09-30 18:19:13.260: ERROR/AndroidRuntime(1376): at android.view.ViewRoot.performTraversals(ViewRoot.java:801)
09-30 18:19:13.260: ERROR/AndroidRuntime(1376): at android.view.ViewRoot.handleMessage(ViewRoot.java:1727)
09-30 18:19:13.260: ERROR/AndroidRuntime(1376): at android.os.Handler.dispatchMessage(Handler.java:99)
09-30 18:19:13.260: ERROR/AndroidRuntime(1376): at android.os.Looper.loop(Looper.java:123)
09-30 18:19:13.260: ERROR/AndroidRuntime(1376): at android.app.ActivityThread.main(ActivityThread.java:4627)
09-30 18:19:13.260: ERROR/AndroidRuntime(1376): at java.lang.reflect.Method.invokeNative(Native Method)
09-30 18:19:13.260: ERROR/AndroidRuntime(1376): at java.lang.reflect.Method.invoke(Method.java:521)
09-30 18:19:13.260: ERROR/AndroidRuntime(1376): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:868)
09-30 18:19:13.260: ERROR/AndroidRuntime(1376): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:626)
09-30 18:19:13.260: ERROR/AndroidRuntime(1376): at dalvik.system.NativeStart.main(Native Method)
答案 0 :(得分：0)
该行
holder = (ViewHolder) convertView.getTag();
为什么要调用getTag（）？我想如果你只是做
holder = (ViewHolder) convertView;
它应该有用。