Java 在ListView中添加项目
我的名单有问题。我有一个活动,我从中获取一些数据 必须在我的类中的变量中访问数据: Mylist.java类Java 在ListView中添加项目,java,android,listview,Java,Android,Listview,我的名单有问题。我有一个活动,我从中获取一些数据 必须在我的类中的变量中访问数据: Mylist.java类 public String Job,Ship,Location,Shift,Date; public String workingHour; Mylist(String job,String loc,String shp,String shft,String dat,String wh){ Job=job; Location=loc;
public String Job,Ship,Location,Shift,Date;
public String workingHour;
Mylist(String job,String loc,String shp,String shft,String dat,String wh){
Job=job;
Location=loc;
Ship=shp;
Shift=shft;
Date=dat;
workingHour=wh;
}
按“保存”按钮,列表必须添加一个项目。我的问题是,当我添加其他项目时,列表只有一个项目。如何解决此问题
添加类:
AddOredit.java
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_add_oredit);
final ArrayList<Mylist>list =new ArrayList<>();
final ArrayList<String> Job=new ArrayList<>();
String selecteditem1, selecteditem2,getlocation,getship,getdate,gethours;
Spinner type=(Spinner)findViewById(R.id.s1);
Spinner shift=(Spinner)findViewById(R.id.s2);
EditText location=(EditText)findViewById(R.id.loc);
EditText ship=(EditText)findViewById(R.id.ship);
EditText date=(EditText)findViewById(R.id.date);
EditText workinghours=(EditText)findViewById(R.id.hours);
Button Save = (Button) findViewById(R.id.editbtn);
Button cancel = (Button) findViewById(R.id.cancelbtn);
selecteditem1 = type.getSelectedItem().toString(); //for first spinner
selecteditem2 = shift.getSelectedItem().toString();//for second spinner
getlocation=location.getText().toString();
getship=ship.getText().toString();
getdate=date.getText().toString();
gethours=workinghours.getText().toString();
list.add(new Mylist(selecteditem1,getlocation,getship,selecteditem2,getdate,gethours));
Log.e(TAG, String.valueOf(list.size()));
for(int i=0;i<list.size();i++){
Job.add("Job "+(i+1));
}
//When pressing save Button
Save.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
//list.add(new Mylist(selecteditem1, getlocation, getship, selecteditem2, getdate, gethours));
Intent intent = new Intent(AddOredit.this, MainActivity.class);
intent.putStringArrayListExtra("MyList", Job);
startActivity(intent);
}
});
}
创建时受保护的void(Bundle savedInstanceState){
super.onCreate(savedInstanceState);
setContentView(R.layout.activity\u add\u oredit);
最终ArrayList=新ArrayList();
最终ArrayList作业=新建ArrayList();
字符串selecteditem1,selecteditem2,getlocation,getship,getdate,gethours;
微调器类型=(微调器)findViewById(R.id.s1);
微调器移位=(微调器)findViewById(R.id.s2);
EditText位置=(EditText)findViewById(R.id.loc);
EditText ship=(EditText)findViewById(R.id.ship);
EditText日期=(EditText)findViewById(R.id.date);
EditText工作时间=(EditText)findViewById(R.id.hours);
按钮保存=(按钮)findviewbyd(R.id.editbtn);
按钮取消=(按钮)findViewById(R.id.cancelbtn);
selecteditem1=type.getSelectedItem().toString();//用于第一个微调器
selecteditem2=shift.getSelectedItem().toString();//用于第二个微调器
getlocation=location.getText().toString();
getship=ship.getText().toString();
getdate=date.getText().toString();
gethours=workinghours.getText().toString();
添加(新的Mylist(selecteditem1,getlocation,getship,selecteditem2,getdate,gethours));
Log.e(TAG、String.valueOf(list.size());
对于(int i=0;i您正在为创建的第二个活动中的列表对象分配新列表。请尝试使用现有对象分配列表,然后添加新对象
编辑:
尝试在全球范围内将其声明为
私有静态ArrayList=新ArrayList()
使用in onCreate()删除它。如果它仍然不起作用,请告诉我。很抱歉,我是新成员。我对此不太了解。请用您最近的代码更新代码好吗?Mylist l=new Mylist(selecteditem1,getlocation,getship,selecteditem2,getdate,gethours);list.add(l);
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
ListView lv= (ListView) findViewById(R.id.listView);
Button ADD=(Button)findViewById(R.id.addbtn);
Button DELETE=(Button)findViewById(R.id.deletebtn);
Button PROFILE=(Button)findViewById(R.id.profilebtn);
Intent intent=getIntent();
ArrayList<String> Job ;
Job=intent.getStringArrayListExtra("MyList");
if(Job!=null){
ListAdapter adapter= new ArrayAdapter<>(this, android.R.layout.simple_list_item_1, Job);
lv.setAdapter(adapter);
//when user click on add button
}
ADD.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View view) {
//go to AddOreditpage
Intent i = new Intent(MainActivity.this, AddOredit.class);
startActivity(i);
}
});