Question

我正在尝试使用XmlPullParseFactory解析本地.xml文件。尽管已在清单文件中应用了权限，但我无法访问路径“/ storage / emulated / 0 / Download / testcards.xml”。

public void parseXML(){
    XmlPullParserFactory parserFactory;
    try{
        parserFactory = XmlPullParserFactory.newInstance();
        XmlPullParser parser = parserFactory.newPullParser();

        InputStream is = new FileInputStream(new File("/storage/emulated/0/Download/testcards.xml"));

        parser.setFeature(XmlPullParser.FEATURE_PROCESS_NAMESPACES, false);
        parser.setInput(is,null);

        processParsing(parser);
    } catch(XmlPullParserException e){

    } catch (IOException e) {

    }

}

我的清单文件：

<manifest xmlns:android="http://schemas.android.com/apk/res/android"
package="demoapp1domain.demoapp1">
<uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE" />
<uses-permission android:name="android.permission.READ_EXTERNAL_STORAGE" />
<application
.....

当我尝试运行我的程序时，我得到：

java.io.FileNotFoundException：/storage/emulated/0/Download/testcards.xml （权限被拒绝）

这是获取路径的代码：

public void startFileExplorer(View view) {

    Intent intent = new Intent(Intent.ACTION_GET_CONTENT);
    intent.setType("text/xml");   
    intent.addCategory(Intent.CATEGORY_OPENABLE);
    try {
        startActivityForResult(Intent.createChooser(intent, "Select your flashcards .XML-file "), REQUEST_CHOOSER);
    } catch (android.content.ActivityNotFoundException ex) {
        Toast.makeText(this, "Please install a File Manager.", Toast.LENGTH_SHORT).show();
    }
}

@Override
protected void onActivityResult(int requestCode, int resultCode, Intent data) {
    switch (requestCode) {
        case REQUEST_CHOOSER:
            if (resultCode == RESULT_OK) {
                final Uri uri = data.getData();
                String myXMLFilePath = uri.getPath();
            }
            break;
    }
}

知道为何拒绝许可？

android {
compileSdkVersion 26
defaultConfig {
    applicationId "demoapp1domain.demoapp1"
    minSdkVersion 21
    targetSdkVersion 26

Answer 1

感谢CommonsWare和Alex，显然你是对的！它现在可以在运行时请求权限。

 String[] permissions = {Manifest.permission.WRITE_EXTERNAL_STORAGE,Manifest.permission.READ_EXTERNAL_STORAGE};
        requestPermissions(permissions,PERMISSION_REQUEST_CODE);
        InputStream is = new FileInputStream(new File("/storage/emulated/0/Download/testcards.xml"));

Android Studio - 读取本地文件 - 尽管在Manifest文件中具有权限，但权限被拒绝

1 个答案: