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我是 Android 的初级开发人员，在尝试访问 SD 卡上的 XML 文件时遇到了以下问题。

首先，我执行了以下检查： - android manifest 中给出了读/写外部存储的权限 - 文件存在于指定位置 - 我检查了：fileexists = true; 可以读=真；isfile = true - 外部存储状态 = 已安装

FileInputStream 仍然给我 FileNoteFoundException。编码：

/** Called when the activity is first created. */
@Override
public void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.main);

}
    //probeersel
    public void myClickHandler(View view) {
        switch (view.getId()) {
            case R.id.button1:

                XPath xpath = XPathFactory.newInstance().newXPath();

                File mealsource = new File(getExternalFilesDir(null)
                         + "/test.xml");

                Toast.makeText(this, "External Files Dir: " + getExternalFilesDir(null), Toast.LENGTH_LONG).show();
                Toast.makeText(this, "Exists: " + String.valueOf(mealsource.exists()), Toast.LENGTH_LONG).show();
                Toast.makeText(this, "Can read: " + String.valueOf(mealsource.canRead()), Toast.LENGTH_LONG).show();
                Toast.makeText(this, "Is file: " + String.valueOf(mealsource.isFile()), Toast.LENGTH_LONG).show();
                Toast.makeText(this, "External Storage State: " + Environment.getExternalStorageState(), Toast.LENGTH_LONG).show();
                Toast.makeText(this, "Absolute path " + mealsource.getAbsolutePath(), Toast.LENGTH_LONG).show();

                FileInputStream mealstream = new FileInputStream(mealsource);

                InputSource inputsource = new InputSource(mealstream);

                expression = "Meals/Meal/ShrtDesc/text()";

                meallist = (NodeList) xpath.evaluate(expression, inputsource, XPathConstants.NODE);

etc

回顾一下：我所有的检查都表明该文件可以读取并准备好执行操作，但 FileInputStream 构造函数似乎对此视而不见。我是什么做的？我错过了什么？它可能与xml的内容有关吗？

非常感谢您能给我的任何帮助或指点。

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