Android Studio android.support.v4.app.Fragment'

Question

我正在使用芳香剂在我的应用程序中编写菜单。 我收到以下错误： “第二个参数类型错误。找到：'com.example.liadrosenberg.application.MenuActivitys.MyAccountActivity'，必需：'android.support.v4.app.Fragment'more ...”

我添加了

 implementation fileTree(dir: 'libs', include: ['*.jar'])
    implementation 'com.android.support:support-v4:21.+' 

到我的build.gradel文件。什么都没有改变。 这些问题仅发生在nav_Account菜单上。

@SuppressWarnings("StatementWithEmptyBody")
@Override
public boolean onNavigationItemSelected(MenuItem item) {
    // Handle navigation view item clicks here.
    int id = item.getItemId();

     if (id == R.id.nav_Gates) {
        FragmentTransaction ft= getSupportFragmentManager().beginTransaction();
        ft.replace(R.id.Count,new MyGatesActivity()).commit();
    } else if (id == R.id.nav_Settings) {
         FragmentTransaction ft= getSupportFragmentManager().beginTransaction();
         ft.replace(R.id.Count,new SettingsActivity()).commit();
    } else if (id == R.id.nav_Account) {
         FragmentTransaction ft=getSupportFragmentManager().beginTransaction();
         ft.replace(R.id.Count,new MyAccountActivity()).commit();
    } else if (id == R.id.nav_About) {
         FragmentTransaction ft= getSupportFragmentManager().beginTransaction();
         ft.replace(R.id.Count,new SettingsActivity()).commit();
    }

我的帐户活动：

package com.example.liadrosenberg.application.MenuActivitys;

import android.app.Fragment;
import android.os.Bundle;
import android.support.annotation.Nullable;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;

import com.example.liadrosenberg.application.R;

public class MyAccountActivity extends Fragment {
    @Override
    @Nullable

    public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {

        View view = inflater.inflate(R.layout.activity_my_account, container, false);


        return view;
    }
}

非常感谢您！

Answer 1

在您的MyAccountActivity中，使用支持库中的Fragment。

使用此导入：

import android.support.v4.app.Fragment;