Solve the problem of Android Q(10) open failed: EACCES (Permission denied)

 1. Add in Manifest.xml

    <uses-permission android:name="android.permission.READ_EXTERNAL_STORAGE" />
    <uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE" />
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2. Dynamic permission acquisition

private void requestPermission(){

    if (ContextCompat.checkSelfPermission(this,
            Manifest.permission.WRITE_EXTERNAL_STORAGE) != PackageManager.PERMISSION_GRANTED){ //When not authorized
        //Make authorization
        ActivityCompat.requestPermissions(this,new String[]{Manifest.permission.WRITE_EXTERNAL_STORAGE},1);
    }else{
    }
}

@Override
public void onRequestPermissionsResult(int requestCode, @NonNull String[] permissions, @NonNull int[] grantResults) {
    super.onRequestPermissionsResult(requestCode, permissions, grantResults);
    switch (requestCode) {
        case 1:
            if (grantResults.length > 0 && grantResults[0] == PackageManager.PERMISSION_GRANTED){ //Agree to the permission application
            }else { //Reject permission request
                Toast.makeText(this,"Permission denied",Toast.LENGTH_SHORT).show();
            }
            break;
        default:
            break;
    }
}

protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        requestPermission();
        .
        .
        .
}
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3. Android 10 Google added a new restriction

Related instructions:
Scoped Storage
Q: How can the application temporarily exempt Q’s external storage sandbox restriction?

A: No. Therefore, we strongly recommend that the application adapt in the Q version, but if you need more time, you can consider adding application android:requestLegacyExternalStorage = “true” to the Manifest. If you want to check whether the exemption is exempt, use the Environment.isExternalStorageLegacy() function.

<application
			.
			.
			.
			
        android:requestLegacyExternalStorage="true"
        	.
        	.
        	.
        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>
    </application>