我正在尝试从我的模拟器的内部存储中打开一个文件（试图将它放在SD卡中，但它放在内部存储中？）。我让用户选择一个文件，然后通过意图将该文件的Uri（注意案例）传递给文本编辑活动。在这项活动中，我尝试了一些方法。我现在的代码看起来像这样（请原谅我的疯狂，我一直在尝试很多事情）：
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(); }
我尝试了很多东西，没有成功。我要么找不到文件（因为它没有为文件添加任何内容，只是尝试加载“document / primary％3Aindex.html”）或其他例外，目前：
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.android.externalstorage.documents/document/primary%3Aindex.html
at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2416)
at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2476)
at android.app.ActivityThread.-wrap11(ActivityThread.java)
at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1344)
at android.os.Handler.dispatchMessage(Handler.java:102)
at android.os.Looper.loop(Looper.java:148)
at android.app.ActivityThread.main(ActivityThread.java:5417)
at java.lang.reflect.Method.invoke(Native Method)
at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:726)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:616)
Caused by: java.lang.IllegalArgumentException: Found authority in URI: file://content://com.android.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 android.app.Activity.performCreate(Activity.java:6237)
at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1107)
at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2369)
at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2476)
at android.app.ActivityThread.-wrap11(ActivityThread.java)
at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1344)
at android.os.Handler.dispatchMessage(Handler.java:102)
at android.os.Looper.loop(Looper.java:148)
at android.app.ActivityThread.main(ActivityThread.java:5417)
at java.lang.reflect.Method.invoke(Native Method)
at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:726)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:616)
即使没有file：// concatenation，也会发生这种情况。我在网上找到的大多数东西要么难以置信，要么不起作用，要么两者兼而有之。真诚地感谢任何帮助。
我在主要活动中获取此URI的代码直接来自developers.android.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();
}
}
}