java如何在Android中从URI/URI打开文件

Question

我正试图从模拟器的内部存储器中打开一个文件（试图将其放入SD卡中，但将其放入内部存储器？）。我让用户选择一个文件，然后通过intent将该文件的Uri（注意大小写）传递给文本编辑活动。在这次活动中，我尝试了一些东西。我当前的代码是这样的（请原谅我的疯狂，我已经尝试了很多东西）：

try {
        Intent intent = getIntent();
        File file;
        Uri uri = Parcels.unwrap(intent.getParcelableExtra("uri"));

        URI newUri = new URI("file://"+uri.toString());
        Log.d("uri", uri.toString());
        Log.d("newUri", newUri.toString());
        file = new File(newUri);
        if (intent != null) {

            Log.d("uriPath", uri.toString());
            if (uri != null) {

                file = new File(uri.getPath());
                String text = readTextFile(file);
                if (text != null) {
                    Log.d("in if text not null", text);
                    mEditText.setText(text);
                }
//        mEditText.setText(readTextFile(file));
            }
        }
    }
    catch(URISyntaxException e) { e.printStackTrace(); }

我尝试了很多事情，但都没有成功。我要么没有找到文件（因为它没有在文件前面加任何前缀，只是尝试加载“document/primary%3Aindex.html”），要么出现其他异常，当前：

06-06 05:43:18.826 10794-10794/net.a40two.pext E/AndroidRuntime: FATAL EXCEPTION: main
                                                             Process: net.a40two.pext, PID: 10794
                                                             java.lang.RuntimeException: Unable to start activity ComponentInfo{net.a40two.pext/net.a40two.pext.ui.EditorActivity}: java.lang.IllegalArgumentException: Found authority in URI: file://content://com.安卓.externalstorage.documents/document/primary%3Aindex.html
                                                                 at 安卓.app.ActivityThread.performLaunchActivity(ActivityThread.java:2416)
                                                                 at 安卓.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2476)
                                                                 at 安卓.app.ActivityThread.-wrap11(ActivityThread.java)
                                                                 at 安卓.app.ActivityThread$H.handleMessage(ActivityThread.java:1344)
                                                                 at 安卓.os.Handler.dispatchMessage(Handler.java:102)
                                                                 at 安卓.os.Looper.loop(Looper.java:148)
                                                                 at 安卓.app.ActivityThread.main(ActivityThread.java:5417)
                                                                 at java.lang.reflect.Method.invoke(Native Method)
                                                                 at com.安卓.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:726)
                                                                 at com.安卓.internal.os.ZygoteInit.main(ZygoteInit.java:616)
                                                              Caused by: java.lang.IllegalArgumentException: Found authority in URI: file://content://com.安卓.externalstorage.documents/document/primary%3Aindex.html
                                                                 at java.io.File.checkURI(File.java:230)
                                                                 at java.io.File.<init>(File.java:175)
                                                                 at net.a40two.pext.ui.EditorActivity.onCreate(EditorActivity.java:67)
                                                                 at 安卓.app.Activity.performCreate(Activity.java:6237)
                                                                 at 安卓.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1107)
                                                                 at 安卓.app.ActivityThread.performLaunchActivity(ActivityThread.java:2369)
                                                                 at 安卓.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2476) 
                                                                 at 安卓.app.ActivityThread.-wrap11(ActivityThread.java) 
                                                                 at 安卓.app.ActivityThread$H.handleMessage(ActivityThread.java:1344) 
                                                                 at 安卓.os.Handler.dispatchMessage(Handler.java:102) 
                                                                 at 安卓.os.Looper.loop(Looper.java:148) 
                                                                 at 安卓.app.ActivityThread.main(ActivityThread.java:5417) 
                                                                 at java.lang.reflect.Method.invoke(Native Method) 
                                                                 at com.安卓.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:726) 
                                                                 at com.安卓.internal.os.ZygoteInit.main(ZygoteInit.java:616) 

即使没有文件：//连接，也会发生这种情况。我能在网上找到的大多数东西要么非常陈旧，要么都不起作用，要么两者兼而有之。我们衷心感谢您的帮助

我主要活动中获取此URI的代码直接来自开发人员。安卓com：

    public void onActivityResult(int requestCode, int resultCode,
                             Intent resultData) {
    // The ACTION_OPEN_DOCUMENT intent was sent with the request code
    // READ_REQUEST_CODE. If the request code seen here doesn't match, it's the
    // response to some other intent, and the code below shouldn't run at all.
    if (requestCode == READ_REQUEST_CODE && resultCode == Activity.RESULT_OK) {
        // The document selected by the user won't be returned in the intent.
        // Instead, a URI to that document will be contained in the return intent
        // provided to this method as a parameter.
        // Pull that URI using resultData.getData().
        Uri uri = null;
        if (resultData != null) {
            uri = resultData.getData();
            Log.i("onActivityResult", "Uri: " + uri.toString());

            Intent intent = new Intent(MainActivity.this, EditorActivity.class);
            intent.putExtra("uri", Parcels.wrap(uri));
            startActivity(intent);
            finish();

        }
    }
}