android之无法使用存储访问框架 (SAF) 设置文档导航器的初始位置
JeffreyZhao
阅读:103
2024-12-31 21:38:35
评论:0
文档说“调用者可以通过 EXTRA_INITIAL_URI
设置文档 URI 来指示文档导航器的初始位置。”
但它不会解决EXTRA_INITIAL_URI
这里。我尝试设置为此给定的常量,如注释(EXTRA_INITIAL_URI = "android.provider.extra.INITIAL_URI"
)中所示,但这不起作用。我该如何解决?
package com.ship.saftwo;
import android.content.Intent;
import android.net.Uri;
import android.os.Environment;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.view.View;
import android.widget.Button;
import java.io.File;
public class MainActivity extends AppCompatActivity{
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
Button button = (Button) findViewById(R.id.button1);
button.setOnClickListener(new View.OnClickListener() {
public void onClick(View v) {navigateToAppDirectory();}});}
private static final int READ_REQUEST_CODE = 42;
// adding this does not help: public static final String EXTRA_INITIAL_URI = "android.provider.extra.INITIAL_URI";
public void navigateToAppDirectory() {
Intent intent = new Intent(Intent.ACTION_OPEN_DOCUMENT);
Uri uri = Uri.parse(Environment.getExternalStorageDirectory().getPath() + File.separator + getResources().getString(R.string.app_name) + File.separator);
intent.addCategory(Intent.CATEGORY_OPENABLE);
intent.setType("*/*");
intent.putExtra(Intent.EXTRA_INITIAL_URI, uri);
//error message: Cannot resolve symbol 'EXTRA_INITIAL_URI'
startActivityForResult(intent, READ_REQUEST_CODE);
}
}
请您参考如下方法:
来自 DocumentsContract.EXTRA_INITIAL_URI :
Location should specify a document URI or a tree URI with document ID. If this URI identifies a non-directory, document navigator will attempt to use the parent of the document as the initial location.
据我所知
Uri.fromFile
,它需要来自 DocumentsProvider 假设
uri
检索自
Intent.ACTION_OPEN_DOCUMENT_TREE :
DocumentFile file = DocumentFile.fromTreeUri(context, uri);
intent.putExtra(EXTRA_INITIAL_URI, file.getUri());
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