openFileOutput() 的用途是什么？

Question

我有这段代码。
有人可以帮助 openFileOutput 中的“0”属性在以下代码中代表什么吗？

public void Save(String fileName) {
    try {
        OutputStreamWriter out =
            new OutputStreamWriter(openFileOutput(fileName, 0));
        out.write(EditText1.);
        out.close();
        Toast.makeText(this, "Note Saved!", Toast.LENGTH_SHORT).show();
    } catch (Throwable t) {
        Toast.makeText(this, "Exception: " + t.toString(), Toast.LENGTH_LONG).show();
    }
}

Answer 1

int: Operating mode.
Value is either 0 or combination of MODE_PRIVATE, MODE_WORLD_READABLE, MODE_WORLD_WRITEABLE or MODE_APPEND.

https://developer.android.com/reference/android/content/Context.html

建议使用常量，但 0 是 Context.MODE_PRIVATE

Answer 2

来自 Context.openFileOutput, the 0 represents the mode for opening the file. In this case, 0 is a synonym for MODE_PRIVATE 的文档：

File creation mode: the default mode, where the created file can only be accessed by the calling application (or all applications sharing the same user ID).

因此只有创建该文件的应用程序才能在以后访问它。另一个选项是 MODE_APPEND，它在当前端点打开文件并向其添加额外数据。

openFileOutput() 的用途是什么？

For what is openFileOutput() used for?

java

android

android-context