getApplicationContext（）

Question

我在getApplicationContext上的公共视图onCreateView上出现错误，似乎它在我的HomeFragment中无法正常工作，但是当我在我的MainAcitivity中尝试这个时，它可以工作。有没有人遇到过这个？

提前致谢！
这是我的代码：

package com.thesis.artificialintelligence;


import android.app.Activity;  
import android.os.Bundle;      
import android.speech.tts.TextToSpeech;  
import android.support.v4.app.Fragment;   
import android.view.LayoutInflater;   
import android.view.View;  
import android.view.ViewGroup;
import android.widget.TextView;

import java.util.Locale;



public class HomeFragment extends Fragment {

private TextView resultTEXT;
private TextView resultTEXT2;
TextToSpeech t1;
private String package_calculator = "com.android.calculator2";
private String class_calculator ="com.android.calculator2.Calculator";
private String package_camera = "com.android.camera";
private String class_camera ="com.android.camera.Camera";
private String package_contacts = "com.android.contacts";
private String class_contacts = "com.android.contacts.Contacts";

@Override
public void onCreate(Bundle savedInstanceState) {

    super.onCreate(savedInstanceState);



}

@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
                         Bundle savedInstanceState) {
    View rootView = inflater.inflate(R.layout.fragment_home, container, false);
    // Inflate the layout for this fragment
    rootView.findViewById(R.id.TVresult);
    rootView.findViewById(R.id.TVresult2);

    t1 = new TextToSpeech(getApplicationContext(), new TextToSpeech.OnInitListener() // There`s an Error here at getApplicationContext()
    {
        @Override
        public void onInit(int status)
        {
            if(status != TextToSpeech.ERROR)
            {
                t1.setLanguage(Locale.UK);
            }
        }
    });




    return rootView;


}



@Override
public void onAttach(Activity activity) {

    super.onAttach(activity);

}

@Override
public void onDetach()
{

    super.onDetach();

}
}

Answer 1

片段没有getApplicationContext()方法。

TextToSpeech只需要一个上下文，因此您可以将其替换为getActivity()。

如果您真的想要应用程序上下文，请执行getActivity().getApplicationContext()

Answer 2

如果您使用的是片段，请将getApplicationContext()替换为getActivity()和getContext()。

Answer 3

亲爱的，您可以使用

获取上下文

getActivity().getApplicationContext();