i am very new in android development. i am adding details to my sqllite table(id,name,number). Now i try to list that. I just want to list name only . and when click on particular name shows number of particular name. Now i am try to list the names. my code is.
details.xml
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android" >
<ListView
android:cacheColorHint="#00000000"
android:layout_height="wrap_content"
android:layout_width="fill_parent"
android:id="@android:id/list"
android:layout_alignParentLeft="true">
</ListView>
</LinearLayout>
DetailOperation.java
public class DetailOperations {
private DataBase dbHelper;
private String[] DETAILS_TABLE_COLUMNS = { DataBase.DETAIL_ID, DataBase.DETAIL_NAME,DataBase.DETAIL_NO };
private SQLiteDatabase database;
public DetailOperations(Context context) {
dbHelper = new DataBase(context);
}
public void open() throws SQLException {
database = dbHelper.getWritableDatabase();
}
public void close() {
dbHelper.close();
}
public List getAllDetails(){
List Details=new ArrayList();
Cursor cursor = database.query(DataBase.DETAILS,
DETAILS_TABLE_COLUMNS, null, null, null, null, null);
cursor.moveToFirst();
while(!cursor.isAfterLast()){
Detail de=parseDetail(cursor);
Details.add(de);
cursor.moveToNext();
}
cursor.close();
return Details;
}
private Detail parseDetail(Cursor cursor) {
Detail d = new Detail();
d.setId((cursor.getInt(0)));
d.setName(cursor.getString(1));
d.setnumber(cursor.getString(2));
return d;
}
}
Details.java
public class Details extends ListActivity {
private DetailOperations detailDBoperation;
@Override
public void onCreate(Bundle savedInstanceState){
super.onCreate(savedInstanceState);
setContentView(R.layout.details);
detailDBoperation=new DetailOperations(this);
detailDBoperation.open();
List<Detail> values=detailDBoperation.getAllDetails();
List<String> names=new ArrayList<String>();
for(int i=0;i<values.size();i++)
{
names.add(values.get(i).getName());
}
ArrayAdapter adapter=new ArrayAdapter(this,android.R.layout.simple_list_item_1,names);
// List values=detailDBoperation.getAllDetails();
// ArrayAdapter adapter=new ArrayAdapter(this,android.R.layout.simple_list_item_1,list ofDetail ->Name);
setListAdapter(adapter);
setListAdapter(adapter);
}
@Override
protected void onResume(){
detailDBoperation.open();
super.onResume();
}
@Override
protected void onPause(){
detailDBoperation.close();
super.onPause();
}
}
Detail.java
public class Detail {
private int id;
private String name;
private String number;
public long getId() { return id;}
public void setId(int id) { this.id = id; }
public String getName() { return this.name; }
public void setName(String name) { this.name = name; }
public String getNumber(){ return this.number; }
public void setnumber(String number){ this.number=number; }
}
but i got the output list like that
com.example.experiments.Detail@417c38d0
com.example.experiments.Detail@417c3a10
com.example.experiments.Detail@417c3ab0
Change Code Like Following
List values=detailDBoperation.getAllDetails();
List<String> names=new ArrayList<String>();
for(int i=0;i<values.size();i++)
{
names.add(values.get(i).getName());
}
ArrayAdapter adapter=new ArrayAdapter(this,android.R.layout.simple_list_item_1,names);
只需通过添加将数组转换为字符串
Details.add(de.toString());
Here
getAllDetails() return List Details which is list of Detail de type Object.You need to pass List of Detail ->Name List in ArrayAdapter adapter=new ArrayAdapter(this,android.R.layout.simple_list_item_1,list of Detail ->Name);
The technical post webpages of this site follow the CC BY-SA 4.0 protocol. If you need to reprint, please indicate the site URL or the original address.Any question please contact:yoyou2525@163.com.