Java 无法从活动转换为片段
我试图将我的活动类转换为片段类，因为我希望我的活动页面在片段页面上运行。这是我更改任何内容之前的活动课：Java 无法从活动转换为片段,java,android,android-fragments,android-activity,Java,Android,Android Fragments,Android Activity,我试图将我的活动类转换为片段类，因为我希望我的活动页面在片段页面上运行。这是我更改任何内容之前的活动课： public class People extends Activity { ImageButton img_btn_save, img_btn_load, img_btn_edit, img_btn_delete; EditText et_name, et_amount, et_description; ListView lv_people_info; String name, amo
public class People extends Activity {
ImageButton img_btn_save, img_btn_load, img_btn_edit, img_btn_delete;
EditText et_name, et_amount, et_description;
ListView lv_people_info;
String name, amount, description;
OwesomeDBHelper mOwesomeDBHelper;
SQLiteDatabase db;
private String[] allColumns = { PeopleEntry._ID,
PeopleEntry.COLUMN_NAME, PeopleEntry.COLUMN_AMOUNT, PeopleEntry.COLUMN_DESCRIPTION};
ArrayList<String> people_info;
ArrayList<String> people_info2;
String selection_delete_where = PeopleEntry.COLUMN_NAME + " LIKE ?";
String[] selectionArgs_delete_where;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_people);
img_btn_save = (ImageButton) findViewById(R.id.img_btn_people_save);
img_btn_load = (ImageButton) findViewById(R.id.img_btn_people_load);
img_btn_edit = (ImageButton) findViewById(R.id.img_btn_people_edit);
img_btn_delete = (ImageButton) findViewById(R.id.img_btn_people_delete);
et_name = (EditText) findViewById(R.id.et_people_name);
et_amount = (EditText) findViewById(R.id.et_people_amount);
et_description = (EditText) findViewById(R.id.et_people_description);
lv_people_info =(ListView) findViewById(R.id.lv_people);
mOwesomeDBHelper = new OwesomeDBHelper(this);
db = mOwesomeDBHelper.getWritableDatabase();
refresh();
img_btn_save.setOnClickListener(new OnClickListener() {
@Override
public void onClick(View v) {
// TODO Auto-generated method stub
name = et_name.getText().toString();
amount = et_amount.getText().toString();
description = et_description.getText().toString();
ContentValues values = new ContentValues();
values.put(PeopleEntry.COLUMN_NAME, name);
values.put(PeopleEntry.COLUMN_AMOUNT, amount);
values.put(PeopleEntry.COLUMN_DESCRIPTION, description);
insertData (db, values);
et_name.setText(null);
et_amount.setText(null);
et_description.setText(null);
refresh();
}
});
img_btn_edit.setOnClickListener(new OnClickListener() {
@Override
public void onClick(View v) {
// TODO Auto-generated method stub
ContentValues values = new ContentValues();
values.put(PeopleEntry.COLUMN_AMOUNT, et_amount.getText().toString());
values.put(PeopleEntry.COLUMN_DESCRIPTION, et_description.getText().toString());
String selection_update = PeopleEntry.COLUMN_NAME + " LIKE ?";
String[] selectionArgs_update = new String[] { et_name.getText().toString() };
int count = db.update(PeopleEntry.TABLE_NAME, values,
selection_update, selectionArgs_update);
Message.message(getApplicationContext(), count + ": Record Updated");
refresh();
}
});
img_btn_delete.setOnClickListener(new OnClickListener() {
@Override
public void onClick(View v) {
// TODO Auto-generated method stub
selectionArgs_delete_where = new String[] { et_name.getText().toString()};
db.delete(PeopleEntry.TABLE_NAME,
selection_delete_where,
selectionArgs_delete_where);
et_name.setText(null);
et_amount.setText(null);
et_description.setText(null);
Message.message(getApplicationContext(), "Record Deleted");
refresh();
}
});
}
public void refresh(){
people_info = new ArrayList<String>();
Cursor cursor = db.query(PeopleEntry.TABLE_NAME,// Table
allColumns, // The columns to return
null, // The columns for the WHERE clause
null, // The values for the WHERE clause
null, // don't group the rows
null, // don't filter by row groups
null, // The sort order
null); // Limits the number of rows returned by the query
cursor.moveToFirst();
while (!cursor.isAfterLast()) {
people_info.add(" \n" + cursor.getString(0) + ". Name: "
+ cursor.getString(1) + " \n Amount (RM): "
+ cursor.getString(2) + " \n Description: "
+ cursor.getString(3) + " \n");
cursor.moveToNext();
}
ArrayAdapter<String> adapter = new ArrayAdapter<String>(
getApplicationContext(),
android.R.layout.simple_list_item_1, people_info);
lv_people_info.setAdapter(adapter);
cursor.close();
}
public void insertData(SQLiteDatabase db, ContentValues values) {
long newRowId;
newRowId = db.insert(PeopleEntry.TABLE_NAME, null, values);
if (newRowId != -1) {
Message.message(this, "New Data Inserted");
}
}
@Override
public boolean onCreateOptionsMenu(Menu menu) {
getMenuInflater().inflate(R.menu.people, menu);
return true;
}
@Override
public boolean onOptionsItemSelected(MenuItem item) {
int id = item.getItemId();
if (id == R.id.action_settings) {
return true;
}
return super.onOptionsItemSelected(item);
}}
公共类人员扩展活动{
图像按钮img\u btn\u保存、img\u btn\u加载、img\u btn\u编辑、img\u btn\u删除；
编辑文本et_名称、et_金额、et_说明；
ListView lv_人员信息；
字符串名称、金额、说明；
OwesomeDBHelper；
sqlitedb数据库；
私有字符串[]allColumns={PeopleEntry.\u ID，
PeopleEntry.COLUMN\u NAME，PeopleEntry.COLUMN\u AMOUNT，PeopleEntry.COLUMN\u DESCRIPTION}；
arraylistpeople\u info；
ArrayList people_info2；
字符串选择_delete_其中=PeopleEntry.COLUMN_NAME+“LIKE？”；
字符串[]selectionArgs\u delete\u其中；
@凌驾
创建时受保护的void（Bundle savedInstanceState）{
super.onCreate（savedInstanceState）；
setContentView（R.layout.activity_-people）；
img_btn_save=（ImageButton）findViewById（R.id.img_btn_people_save）；
img_btn_load=（ImageButton）findViewById（R.id.img_btn_people_load）；
img_btn_edit=（ImageButton）findViewById（R.id.img_btn_people_edit）；
img_btn_delete=（ImageButton）findViewById（R.id.img_btn_people_delete）；
et_name=（EditText）findViewById（R.id.et_people_name）；
et金额=（EditText）findViewById（R.id.et金额）；
et_description=（EditText）findViewById（R.id.et_people_description）；
lv_people_info=（ListView）findViewById（R.id.lv_people）；
mOwesomeDBHelper=新的OwesomeDBHelper（此）；
db=mOwesomeDBHelper.getWritableDatabase（）；
刷新（）；
img_btn_save.setOnClickListener（新的OnClickListener（）{
@凌驾
公共void onClick（视图v）{
//TODO自动生成的方法存根
name=et_name.getText（）.toString（）；
amount=et_amount.getText（）.toString（）；
description=et_description.getText（）.toString（）；
ContentValues=新的ContentValues（）；
value.put（PeopleEntry.COLUMN\u NAME，NAME）；
value.put（PeopleEntry.COLUMN\u AMOUNT，AMOUNT）；
value.put（PeopleEntry.COLUMN_DESCRIPTION，DESCRIPTION）；
插入数据（db，值）；
et_name.setText（空）；
et_amount.setText（空）；
et_description.setText（空）；
刷新（）；
}
});
img_btn_edit.setOnClickListener（新的OnClickListener（）{
@凌驾
公共void onClick（视图v）{
//TODO自动生成的方法存根
ContentValues=新的ContentValues（）；
value.put（PeopleEntry.COLUMN_AMOUNT，et_AMOUNT.getText（）.toString（））；
value.put（PeopleEntry.COLUMN_DESCRIPTION，et_DESCRIPTION.getText（）.toString（））；
字符串选择_update=PeopleEntry.COLUMN_NAME+“LIKE？”；
String[]selectionArgs_update=新字符串[]{et_name.getText（）.toString（）}；
int count=db.update（PeopleEntry.TABLE_名称、值、，
选择更新，选择更新）；
Message.Message（getApplicationContext（），count+“：记录已更新”）；
刷新（）；
}
});
img_btn_delete.setOnClickListener（新的OnClickListener（）{
@凌驾
公共void onClick（视图v）{
//TODO自动生成的方法存根
selectionArgs_delete_其中=新字符串[]{et_name.getText（）.toString（）}；
db.delete（PeopleEntry.TABLE_NAME，
选择_删除_其中，
选择GS（删除位置）；
et_name.setText（空）；
et_amount.setText（空）；
et_description.setText（空）；
Message.Message（getApplicationContext（），“记录已删除”）；
刷新（）；
}
});
}
公共无效刷新（）{
people_info=new ArrayList（）；
Cursor Cursor=db.query（PeopleEntry.TABLE_NAME，//TABLE
allColumns，//要返回的列
null，//WHERE子句的列
null，//WHERE子句的值
null，//不对行进行分组
null，//不按行组筛选
null，//排序顺序
null）；//限制查询返回的行数
cursor.moveToFirst（）；
而（！cursor.isAfterLast（））{
人员信息。添加（“\n”+游标。getString（0）+”。名称：
+cursor.getString（1）+“\n金额（RM）：”
+cursor.getString（2）+“\n说明：”
+cursor.getString（3）+“\n”）；
cursor.moveToNext（）；
}
ArrayAdapter适配器=新的ArrayAdapter(
getApplicationContext（），
android.R.layout.simple_list_item_1，people_info）；
lv_people_info.setAdapter（适配器）；
cursor.close（）；
}
公共void insertData（SQLiteDatabase db，ContentValues）{
长纽罗维德；
newRowId=db.insert（PeopleEntry.TABLE_NAME，null，value）；
如果（newRowId！=-1）{
消息。消息（本“插入的新数据”）；
}
}
@凌驾
公共布尔onCreateOptions菜单（菜单）{
getMenuInflater（）.充气（R.menu.people，menu）；
返回true；
}
@凌驾
公共布尔值onOptionsItemSelected（菜单项项）{
int id=item.getItemId（）；
if（id==R.id.action\u设置）{
返回true；
}
返回super.onOptionsItemSelected（项目）；
}}
public class People extends Fragment {
ImageButton img_btn_save, img_btn_load, img_btn_edit, img_btn_delete;
EditText et_name, et_amount, et_description;
ListView lv_people_info;
String name, amount, description;
OwesomeDBHelper mOwesomeDBHelper;
SQLiteDatabase db;
//Store columns in array
private String[] allColumns = { PeopleEntry._ID,
PeopleEntry.COLUMN_NAME, PeopleEntry.COLUMN_AMOUNT, PeopleEntry.COLUMN_DESCRIPTION};
//Declare array list for list view
ArrayList<String> people_info;
ArrayList<String> people_info2;
// Define 'where' part of query.
String selection_delete_where = PeopleEntry.COLUMN_NAME + " LIKE ?";
// Specify arguments in placeholder order.
String[] selectionArgs_delete_where;
public People(){}
@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
Bundle savedInstanceState) {
View rootView = inflater.inflate(R.layout.fragment_people, container, false);
FragmentActivity faActivity = (FragmentActivity) super.getActivity();
// Replace LinearLayout by the type of the root element of the layout you're trying to load
LinearLayout llLayout = (LinearLayout) inflater.inflate(R.layout.fragment_people, container, false);
img_btn_save = (ImageButton) llLayout.findViewById(R.id.img_btn_people_save);
img_btn_load = (ImageButton) llLayout.findViewById(R.id.img_btn_people_load);
img_btn_edit = (ImageButton) llLayout.findViewById(R.id.img_btn_people_edit);
img_btn_delete = (ImageButton) llLayout.findViewById(R.id.img_btn_people_delete);
et_name = (EditText) llLayout.findViewById(R.id.et_people_name);
et_amount = (EditText) llLayout.findViewById(R.id.et_people_amount);
et_description = (EditText) llLayout.findViewById(R.id.et_people_description);
lv_people_info =(ListView) llLayout.findViewById(R.id.lv_people);
mOwesomeDBHelper = new OwesomeDBHelper(super.getActivity());
db = mOwesomeDBHelper.getWritableDatabase();
refresh();
img_btn_save.setOnClickListener(new OnClickListener() {
@Override
public void onClick(View v) {
// TODO Auto-generated method stub
name = et_name.getText().toString();
amount = et_amount.getText().toString();
description = et_description.getText().toString();
ContentValues values = new ContentValues();
values.put(PeopleEntry.COLUMN_NAME, name);
values.put(PeopleEntry.COLUMN_AMOUNT, amount);
values.put(PeopleEntry.COLUMN_DESCRIPTION, description);
insertData (db, values);
et_name.setText(null);
et_amount.setText(null);
et_description.setText(null);
refresh();
}
});
img_btn_edit.setOnClickListener(new OnClickListener() {
@Override
public void onClick(View v) {
// TODO Auto-generated method stub
ContentValues values = new ContentValues();
values.put(PeopleEntry.COLUMN_AMOUNT, et_amount.getText().toString());
values.put(PeopleEntry.COLUMN_DESCRIPTION, et_description.getText().toString());
// Which row to update, based on the name
String selection_update = PeopleEntry.COLUMN_NAME + " LIKE ?";
String[] selectionArgs_update = new String[] { et_name.getText().toString() };
int count = db.update(PeopleEntry.TABLE_NAME, values,
selection_update, selectionArgs_update);
Message.message(getActivity().getApplicationContext(), count + ": Record Updated");
refresh();
}
});
img_btn_delete.setOnClickListener(new OnClickListener() {
@Override
public void onClick(View v) {
// TODO Auto-generated method stub
selectionArgs_delete_where = new String[] { et_name.getText().toString()};
db.delete(PeopleEntry.TABLE_NAME,
selection_delete_where,
selectionArgs_delete_where);
et_name.setText(null);
et_amount.setText(null);
et_description.setText(null);
Message.message(getActivity().getApplicationContext(), "Record Deleted");
refresh();
}
});
//// I get error on either one of these:
return rootView;
return llLayout;
}
public void refresh(){
people_info = new ArrayList<String>();
Cursor cursor = db.query(PeopleEntry.TABLE_NAME,// Table
allColumns, // The columns to return
null, // The columns for the WHERE clause
null, // The values for the WHERE clause
null, // don't group the rows
null, // don't filter by row groups
null, // The sort order
null); // Limits the number of rows returned by the query
cursor.moveToFirst();
while (!cursor.isAfterLast()) {
people_info.add(" \n" + cursor.getString(0) + ". Name: "
+ cursor.getString(1) + " \n Amount (RM): "
+ cursor.getString(2) + " \n Description: "
+ cursor.getString(3) + " \n");
cursor.moveToNext();
}
ArrayAdapter<String> adapter = new ArrayAdapter<String>(
getActivity().getApplicationContext(),
android.R.layout.simple_list_item_1, people_info);
lv_people_info.setAdapter(adapter);
cursor.close();
}
public void insertData(SQLiteDatabase db, ContentValues values) {
long newRowId;
newRowId = db.insert(PeopleEntry.TABLE_NAME, null, values);
if (newRowId != -1) {
Message.message(super.getActivity(), "New Data Inserted");
}
}
@Override
public void onCreateOptionsMenu(Menu menu, MenuInflater inflater) {
/////// I suddenly get red underline on "people"
getActivity().getMenuInflater().inflate(R.menu.people, menu);
//return true;
super.onCreateOptionsMenu(menu, inflater);
}
@Override
public boolean onOptionsItemSelected(MenuItem item) {
int id = item.getItemId();
if (id == R.id.action_settings) {
return true;
}
return super.onOptionsItemSelected(item);
}}
公共类人员扩展片段{
图像按钮img\u btn\u保存、img\u btn\u加载、img\u btn\u编辑、img\u btn\u删除；
编辑文本et_名称、et_金额、et_说明；
ListView lv_人员信息；
字符串名称、金额、说明；
OwesomeDBHelper；
sqlitedb数据库；
//在数组中存储列
私有字符串[]allColumns={PeopleEntry.\u ID，
PeopleEntry.COLUMN\u NAME，PeopleEntry.COLUMN\u AMOUNT，PeopleEntry.COLUMN\u DESCRIPTION}；
//声明数组li
LinearLayout llLayout = (LinearLayout)inflater.inflate(R.layout.fragment_people, container, false);
View rootView = inflater.inflate(R.layout.fragment_people, container, false);
LinearLayout llLayout = (LinearLayout)inflater.inflate(R.layout.fragment_people, container, false);
return llLayout;
getActivity().getMenuInflater().inflate(R.menu.people, menu);
inflater.inflate(R.menu.people, menu);