【发布时间】：2023-04-06 01:37:01
【问题描述】：
现在我有一个名为 Tasks 的可序列化对象类，我打算制作一个 Listview，每个对象代表列表中的一个项目，但是当我运行代码时它不起作用
这是主要活动：
public class MainActivity extends ActionBarActivity {
EditText NameET, ImportanceED, dateED, TimeED;
String Name, Importance, date, Time;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
NameET = (EditText) findViewById(R.id.NameeditText);
ImportanceED = (EditText) findViewById(R.id.ImportanceeditText2);
dateED = (EditText) findViewById(R.id.dateeditText3);
TimeED = (EditText) findViewById(R.id.timeeditText4);
public void GetTexts() {
Name = NameET.getText().toString();
Importance = ImportanceED.getText().toString();
date = dateED.getText().toString();
Time = TimeED.getText().toString();
}
public void AddTask(View view) {
String testName = NameET.getText().toString().trim();
String testImportance = ImportanceED.getText().toString().trim();
String testDate = dateED.getText().toString().trim();
String testTime = TimeED.getText().toString().trim();
GetTexts();
OpenDetailsActivity();
}
}
public void OpenDetailsActivity() {
Intent DetailsIntent = new Intent(this, DetailsActivity.class);
DetailsIntent.putExtra("Name",Name );
DetailsIntent.putExtra("Importance",Importance );
DetailsIntent.putExtra("date",date );
DetailsIntent.putExtra("Time",Time );
startActivity(DetailsIntent);
}
这是包含活动的列表：
公共类 DetailsActivity 扩展 Activity {
ListView list;
String Name;
String Importance;
String date;
String Time ;
ArrayList <Tasks>TaskList = new ArrayList();
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.task_list);
Intent intent = getIntent();
Name= intent.getStringExtra("Name");
Importance= intent.getStringExtra("Importance");
date= intent.getStringExtra("date");
Time= intent.getStringExtra("Time");
addToList();
}
public void addToList() {
int i ;
int N = TaskList.size();
if (N > 0 ){
i = N + 1 ;
} else {
i= 0 ;
}
直到这里一切正常，列表显示为空白
TaskList.add(i, new Tasks(Name, Importance, date, Time));
ListAdapter adapter = new ListAdapter(this, TaskList);
list = (ListView) findViewById(R.id.listView_tasks);
list.setAdapter(adapter);
list.setOnItemClickListener(new AdapterView.OnItemClickListener() {
@Override
public void onItemClick(AdapterView<?> parent, View view,
int position, long id) {
String SelectedTask = TaskList.get(position).getName();
Toast.makeText(getApplicationContext(), SelectedTask, Toast.LENGTH_SHORT).show();
这是任务序列化类
class Tasks implements Serializable {
String name="";
String date="";
String time = "";
String importance="";
public Tasks(String name, String importance, String date , String time) {
this.date = date;
this.importance = importance;
this.name = name;
this.time = time;
}
public String getDate() {
return date;
}
public String getImportance() {
return importance;
}
public String getName() {
return name;
}
public void setName(String name) {
this.name = name;
}
public String getTime() {
return time;
}
这是自定义适配器
public class ListAdapter extends ArrayAdapter {
private final Activity context;
List<Tasks> TaskList;
public ListAdapter(Activity context, List<Tasks> TaskList) {
super(context, R.layout.row_layout);
this.context=context;
this.TaskList=TaskList;
}
public View getView(int position,View view,ViewGroup parent) {
LayoutInflater inflater=context.getLayoutInflater();
View rowView=inflater.inflate(R.layout.row_layout, null , false);
TextView Name = (TextView) rowView.findViewById(R.id.NameTV);
TextView Date = (TextView) rowView.findViewById(R.id.dateTV);
TextView Importance = (TextView) rowView.findViewById(R.id.importanceTV);
TextView Time = (TextView) rowView.findViewById(R.id.timeTV);
TaskList.get(position).getName();
Name.setText(TaskList.get(position).getName());
Date.setText(TaskList.get(position).getDate());
Importance.setText(TaskList.get(position).getImportance());
Time.setText(TaskList.get(position).getTime());
return rowView;
这是 task_list 布局
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:orientation="vertical" android:layout_width="match_parent"
android:layout_height="match_parent">
<ListView
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:id="@+id/listView_tasks" />
</LinearLayout>
还有这个 row_layout
<LinearLayout
android:orientation="vertical"
android:layout_width="0dp"
android:layout_height="wrap_content"
android:layout_weight="1">
<TextView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:textAppearance="?android:attr/textAppearanceLarge"
android:id="@+id/NameTV"
android:layout_gravity="center_horizontal" />
</LinearLayout>
<LinearLayout
android:orientation="vertical"
android:layout_width="0dp"
android:layout_height="wrap_content"
android:layout_weight="1">
<TextView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:textAppearance="?android:attr/textAppearanceMedium"
android:id="@+id/importanceTV" />
<TextView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:textAppearance="?android:attr/textAppearanceSmall"
android:id="@+id/dateTV" />
<TextView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:textAppearance="?android:attr/textAppearanceSmall"
android:id="@+id/timeTV" />
</LinearLayout>
</LinearLayout>
【问题讨论】：
-
您需要具体说明什么是“不工作”。有堆栈跟踪吗？出乎意料的结果？
-
当我运行播放列表时，它不显示任何项目，只是空白列表
-
@MuhammadMustafa 你有任何运行时或编译错误吗？
-
@Mussa 没有错误
-
@MuhammadMustafa 你能发布你在适配器中膨胀的活动和项目的 xml 布局吗？
标签： android listview serialization