Question

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

首先，我进行了以下检查： - 读取/写入外部存储的权限在android清单中给出 - 该文件存在于指定位置 - 我查了一下：fileexists = true; canread = true; isfile = true - externalstorage state =已挂载

仍然FileInputStream给我FileNoteFoundException。代码：

/** 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

所以回顾一下：我的所有检查都说文件是在那里读取并准备好进行操作，但是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？它可能与某种程度上的xml内容有关吗？

非常感谢你给我的任何帮助或指示。

Android FileInputStream FileNotFoundException即使权限到位，文件存在，存储已挂载，可以读取等

0 个答案: