与碎片不兼容的类型错误 [英] Incompatible types error with Fragments

问题描述

我正在尝试将片段添加到我的主要活动中。当我输入 fragment = new CrimeFragment（）; 我得到一个不兼容的类型错误。

I'm trying to add a fragment to my main activity. When I type fragment = new CrimeFragment(); I get an Incompatible types error.

我尝试将新的CrimeFragment（）; 投射到片段，但那不起作用。

I tried casting new CrimeFragment(); to a Fragment, but that didn't work.

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：

不兼容的类型

required：android.v4.support.app .Fragment

found：com.adamanteusstudios.officesmostwanted.OffenseFragment

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

如何修复此错误？

推荐答案

在课程 OffenseFragment.java 替换

import android.app.Fragment;

with

import android.support.v4.app.Fragment;

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