java - fragment 不兼容的类型错误

Question

我正在尝试将 fragment 添加到我的主要 Activity 中。当我键入 fragment = new CrimeFragment(); 时，我收到了 Incompatible types 错误。

我尝试将 new CrimeFragment(); 转换为 Fragment，但这没有用。

package com.adamanteusstudios.officesmostwanted;

import android.os.Bundle;
import android.support.v4.app.Fragment;
import android.support.v4.app.FragmentActivity;
import android.support.v4.app.FragmentManager;


public class MostWantedActivity extends FragmentActivity {

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_most_wanted);

        //getting fragmentManager
        FragmentManager fm = getSupportFragmentManager();
        Fragment fragment = fm.findFragmentById(R.id.fragmentContainer);

        if(fragment == null){
            ***fragment =  new OffenseFragment();***
            fm.beginTransaction().add(R.id.fragmentContainer, fragment).commit();
        }
    }



}

错误说:

incompatible types
required: android.v4.support.app.Fragment
found: com.adamanteusstudios.officesmostwanted.OffenseFragment

如何修复此错误？

Answer 1

在 OffenseFragment.java 类中替换

import android.app.Fragment;

与

import android.support.v4.app.Fragment;