使用 getFragmentManager() 时类型不兼容
Incompatible types while using getFragmentManager()
我有以下代码:
package asus.example.com.notes1;
import android.app.Activity;
import android.content.Intent;
import android.os.Bundle;
import android.support.v4.app.Fragment;
import android.support.v4.app.FragmentTransaction;
import android.view.Menu;
import android.view.MenuItem;
import android.view.View;
import android.widget.AdapterView;
import android.widget.ArrayAdapter;
import android.widget.ListView;
import android.widget.ShareActionProvider;
public class MainActivity extends Activity {
private void selectItem(int position){
Fragment fragment;
switch (position){
case 1:
fragment = new PizzaFragment();
break;
case 2:
fragment = new PastaFragment();
break;
case 3:
fragment = new StoresFragment();
break;
default:
fragment = new TopFragment();
}
FragmentTransaction ft = getFragmentManager().beginTransaction();
ft.replace(R.id.content_frame, fragment);
ft.addToBackStack(null);
ft.setTransition(FragmentTransaction.TRANSIT_FRAGMENT_FADE);
ft.commit();
}
}
我不知道为什么,但 Android Studio 在以下行下划线:FragmentTransaction ft = getFragmentManager().beginTransaction();
并写道:
incompatible types. Required:
android.support.v4.app.FragmentTransaction Found:
android.app.FragmentTransaction
试图改变:
android.support.v4.app.FragmentTransaction
在:
android.app.FragmentTransaction
但在这种情况下,它取消了以下行:
ft.replace(R.id.content_frame, fragment);
并写道:
Wrong 2nd arguement type
也许,这是因为扩展 Activity(也许 AppCompat 一切正常,但我无法更改,就好像我知道,我在我的应用程序中使用的主题不兼容与 Appcompat)
你用错了 android.support.v4.app.FragmentManager
那么你应该使用 getSupportFragmentManager()
需要改变
FragmentTransaction ft = getSupportFragmentManager().beginTransaction();
ft.replace(R.id.content_frame, fragment);
我有以下代码:
package asus.example.com.notes1;
import android.app.Activity;
import android.content.Intent;
import android.os.Bundle;
import android.support.v4.app.Fragment;
import android.support.v4.app.FragmentTransaction;
import android.view.Menu;
import android.view.MenuItem;
import android.view.View;
import android.widget.AdapterView;
import android.widget.ArrayAdapter;
import android.widget.ListView;
import android.widget.ShareActionProvider;
public class MainActivity extends Activity {
private void selectItem(int position){
Fragment fragment;
switch (position){
case 1:
fragment = new PizzaFragment();
break;
case 2:
fragment = new PastaFragment();
break;
case 3:
fragment = new StoresFragment();
break;
default:
fragment = new TopFragment();
}
FragmentTransaction ft = getFragmentManager().beginTransaction();
ft.replace(R.id.content_frame, fragment);
ft.addToBackStack(null);
ft.setTransition(FragmentTransaction.TRANSIT_FRAGMENT_FADE);
ft.commit();
}
}
我不知道为什么,但 Android Studio 在以下行下划线:FragmentTransaction ft = getFragmentManager().beginTransaction();
并写道:
incompatible types. Required: android.support.v4.app.FragmentTransaction Found: android.app.FragmentTransaction
试图改变:
android.support.v4.app.FragmentTransaction
在:
android.app.FragmentTransaction
但在这种情况下,它取消了以下行:
ft.replace(R.id.content_frame, fragment);
并写道:
Wrong 2nd arguement type
也许,这是因为扩展 Activity(也许 AppCompat 一切正常,但我无法更改,就好像我知道,我在我的应用程序中使用的主题不兼容与 Appcompat)
你用错了 android.support.v4.app.FragmentManager
那么你应该使用 getSupportFragmentManager()
需要改变
FragmentTransaction ft = getSupportFragmentManager().beginTransaction();
ft.replace(R.id.content_frame, fragment);