[英]Place an activity with its layout on the Main Activity on launch
目標:模塊化方法
我試圖理解一種方法,其中 Main Activity 有點像一個階段,我將子組件堆疊在它之上,具有某種模塊化方法。
MainActivity.java (父)
public class MainActivity extends AppCompatActivity {
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
}
}
活動_main.xml
<?xml version="1.0" encoding="utf-8"?>
<android.support.constraint.ConstraintLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:app="http://schemas.android.com/apk/res-auto"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="match_parent"
android:layout_height="match_parent"
tools:context=".MainActivity">
</android.support.constraint.ConstraintLayout>
UserList.java (子)
public class UserList extends AppCompatActivity {
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_user_list);
}
public void initView(ArrayList<UserVO> users) {
this.users = users;
userList.setAdapter(new UserListAdapter());
}
class UserListAdapter extends BaseAdapter {
@Override
public int getCount() {
return users.size();
}
@Override
public Object getItem(int i) {
return null;
}
@Override
public long getItemId(int i) {
return 0;
}
@Override
public View getView(int i, View view, ViewGroup viewGroup) {
view = layoutInflater.inflate(R.layout.user_list, null);
TextView givenName = view.findViewById(R.id.givenName);
givenName.setText(users.get(i).givenName());
return view;
}
}
}
活動用戶列表.xml
<?xml version="1.0" encoding="utf-8"?>
<android.support.constraint.ConstraintLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:app="http://schemas.android.com/apk/res-auto"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="match_parent"
android:layout_height="match_parent"
tools:context=".view.components.UserList">
<ListView
android:id="@+id/userList"
android:layout_width="395dp"
android:layout_height="715dp"
tools:layout_editor_absoluteX="8dp"
tools:layout_editor_absoluteY="8dp" />
</android.support.constraint.ConstraintLayout>
我相信ListView
在某處需要這個,每個單元格都有一個 textField
<TextView
android:id="@+id/givenName"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:padding="8dp"
android:text="TextView"
android:textSize="18sp" />
題
如何在應用程序啟動時將UserList
添加到 MainActivity?
編輯
我遵循了相同的命名約定。 這是一個錯誤:
java.lang.IllegalStateException: ArrayAdapter 要求資源 ID 為 TextView
使用片段試試這個,
Activity Main code,
public class MainActivity extends AppCompatActivity {
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
loadData();
}
private void loadData() {
getSupportFragmentManager().beginTransaction()
.replace(R.id.frame_layout,new ListViewFragment())
.commit();
}
}
activity_main layout:(需要使用frame layout來實現fragments)
<android.support.constraint.ConstraintLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:app="http://schemas.android.com/apk/res-auto"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="match_parent"
android:layout_height="match_parent"
tools:context=".MainActivity">
<FrameLayout
android:layout_width="match_parent"
android:layout_height="match_parent"
android:id="@+id/frame_layout"/>
下面是片段代碼:
public class ListViewFragment extends Fragment {
private String listItems[] = {"vfvd","vdvvfv","vvddv","vfddvvd"}; //static data
ListView userList;
@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
Bundle savedInstanceState) {
// Inflate the layout for this fragment
View view = inflater.inflate(R.layout.fragment_list_view, container, false);
userList = view.findViewById(R.id.userList);
ArrayAdapter arrayAdapter = new
ArrayAdapter(getActivity(),R.layout.user_list_items,listItems);
userList.setAdapter(arrayAdapter);
return view;
}
}
和片段布局
<FrameLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="match_parent"
android:layout_height="match_parent"
tools:context=".ListViewFragment">
<ListView
android:id="@+id/userList"
android:layout_width="395dp"
android:layout_height="715dp"
tools:layout_editor_absoluteX="8dp"
tools:layout_editor_absoluteY="8dp" />
textview 的代碼,我們需要在其中放置列表視圖數據
<?xml version="1.0" encoding="utf-8"?>
<TextView android:id="@+id/givenName"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:padding="8dp"
android:text="TextView"
android:textSize="18sp"
xmlns:android="http://schemas.android.com/apk/res/android" />
您必須在我剛剛使用靜態數據的片段中實現適配器代碼,並且我能夠獲得您想要的功能。 如果您需要進一步的幫助,我可以為您在下方評論。 謝謝你。
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