图像未出现在智能手机目录中

Question

在应用程序中，按下按钮后，browseImages方法将启动一个意图，该意图将显示手机中的所有图像。单击图像后，该图像应保存到电话（物理设备）中的以下路径：Android/data/com.example.gaurangadas.imagefrominternalstorage/files/Pictures
但是，该路径中的图像文件为空，没有内容

MainActivity.java

package com.example.gaurangadas.imagefrominternalstorage;

import ...

public class MainActivity extends AppCompatActivity {

    File photoFile = null;

    private static final int READ_REQUEST_CODE = 42;

    public void browseImages(View view) {

        Intent intent = new Intent(Intent.ACTION_OPEN_DOCUMENT);

        intent.addCategory(Intent.CATEGORY_OPENABLE);

        intent.setType("image/*");

        try {
            photoFile = createImageFile();
        } catch (Exception e) {
            e.printStackTrace();
        }

        if (photoFile != null) {
            Uri photoURI = FileProvider.getUriForFile(this,
                    "com.example.android.fileprovider",
                    photoFile);
            intent.putExtra(MediaStore.EXTRA_OUTPUT,photoURI);
            startActivityForResult(intent,READ_REQUEST_CODE);
        }

    }

    public File createImageFile() throws IOException {
        String timeStamp = new SimpleDateFormat("yyyyMMdd_HHmmss").format(new Date());
        String imageFileName = "JPEG_" + timeStamp + "_";
        File storageDir = getExternalFilesDir(Environment.DIRECTORY_PICTURES);
        File image = File.createTempFile(
                imageFileName,  /* prefix */
                ".jpg",         /* suffix */
                storageDir      /* directory */
        );

        return image;
    }

    @Override
    public void onActivityResult(int requestCode, int resultCode,
                                 Intent resultData) {

        if (requestCode == READ_REQUEST_CODE && resultCode == Activity.RESULT_OK) {
            Bitmap bitmap = null;
            if (resultData != null) {
                Uri uri = resultData.getData();
            }

        }
    }

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);

    }
}

AndroidManifest.xml

<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
    package="com.example.gaurangadas.imagefrominternalstorage">

    <application
        android:allowBackup="true"
        android:icon="@mipmap/ic_launcher"
        android:label="@string/app_name"
        android:roundIcon="@mipmap/ic_launcher_round"
        android:supportsRtl="true"
        android:theme="@style/AppTheme">
        <activity android:name=".MainActivity">
            <intent-filter>
                <action android:name="android.intent.action.MAIN" />

                <category android:name="android.intent.category.LAUNCHER" />
            </intent-filter>
        </activity>

        <meta-data
            android:name="preloaded_fonts"
            android:resource="@array/preloaded_fonts" />

        <provider
            android:name="android.support.v4.content.FileProvider"
            android:authorities="com.example.android.fileprovider"
            android:exported="false"
            android:grantUriPermissions="true">
            <meta-data
                android:name="android.support.FILE_PROVIDER_PATHS"
                android:resource="@xml/file_paths" />
        </provider>

    </application>

</manifest>