Question

我在openFileOutput上遇到此错误（FILENAME，Context.MODE_PRIVATE）;

之前我使用过此代码，我不知道为什么它现在不能正常工作。错误读取：方法openFileOutput（String，int）未定义类型SaveProjects

package com.example.musicvideomaker;

import java.io.FileNotFoundException;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.ObjectOutputStream;
import java.io.OutputStreamWriter;
import java.util.ArrayList;

import android.content.Context;
import android.util.Log;

import com.example.musicvideomaker.Projects;

public class SaveProjects {

FileOutputStream fos;

public ArrayList<Projects> Projects;


public void saveProject(Projects project, String FILENAME)
{
    this.Projects.add(project);
    try
    {
    fos = openFileOutput(FILENAME, Context.MODE_PRIVATE);
    ObjectOutputStream os = new ObjectOutputStream(fos);
    os.writeObject(this);
    os.close();
    }
    catch (FileNotFoundException e)
    {
        e.printStackTrace();
    }
}

}

Answer 1

由于您不在活动中，因此您需要使用上下文来调用＆＃34; openFileOutput＆＃34;。虽然您的Context要么需要在Application文件中静态声明，要么从Activity调用SaveProject类，您可以将上下文作为类的参数传递（尽管这是不好的做法）。然后你可以试试这个：

public class SaveProjects {

private Context context;

FileOutputStream fos;


public ArrayList<Projects> Projects;

public SaveProjects(Context context) {
    this.context = context;
}

public void saveProject(Projects project, String FILENAME)
{
    this.Projects.add(project);
    try
    {
    fos = context.openFileOutput(FILENAME, Context.MODE_PRIVATE);
    ObjectOutputStream os = new ObjectOutputStream(fos);
    os.writeObject(this);
    os.close();
    }
    catch (FileNotFoundException e)
    {
        e.printStackTrace();
    }
}

}

尝试写入文件时出错

1 个答案: