need to access the system permission

Question

I am trying to access the folder of my app from data/data but it need to change the permission to 0777. So, I had used some code that can change at

Answer 1

Here, I developed one class for to give granted permission on marshmallow device.

Getpermission.java

public class GetPermission extends Activity {

private static final int REQUEST_CODE = 2;
private static final int REQUEST_PERMISSIONS = 10;

@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);

    if (Build.VERSION.SDK_INT >=23)
    {
        getPermission();
    }
    else
    {
        startService();
    }

}

private void getPermission()
{
    if (ContextCompat.checkSelfPermission(GetPermission.this, Manifest.permission.READ_EXTERNAL_STORAGE)
            + ContextCompat.checkSelfPermission(GetPermission.this, Manifest.permission.WRITE_EXTERNAL_STORAGE)
            != PackageManager.PERMISSION_GRANTED) {

        ActivityCompat.requestPermissions(GetPermission.this,
                new String[]{Manifest.permission.READ_EXTERNAL_STORAGE,
                },
                REQUEST_PERMISSIONS);

    }
    else
    {
        startService();
    }
}
private void startService()
{

    //In this intent add your starting first activity

    Intent in = new Intent(getApplicationContext(),HomeScreen.class);
    startActivity(in)
    finish();
}

@Override
public void onRequestPermissionsResult(final int requestCode, @NonNull final String[] permissions, @NonNull final int[] grantResults) {
    super.onRequestPermissionsResult(requestCode, permissions, grantResults);
    if (requestCode == REQUEST_PERMISSIONS) {
        if ((grantResults.length > 0) && (grantResults[0]+grantResults[1]+grantResults[2])
                == PackageManager.PERMISSION_GRANTED) {

            getWindowOverLayPermission();
        } else {
            Toast.makeText(GetPermission.this, "All Permission is required to use xyz", Toast.LENGTH_LONG).show();
            finish();
        }
    }
}

@TargetApi(Build.VERSION_CODES.M)
private void getWindowOverLayPermission()
{
    if (!Settings.canDrawOverlays(GetPermission.this))
    {
        Intent intent = new Intent(Settings.ACTION_MANAGE_OVERLAY_PERMISSION,
                Uri.parse("package:" + getPackageName()));
        startActivityForResult(intent, REQUEST_CODE);
    }
    else
    {
        startService();
    }
}



@Override
protected void onActivityResult(int requestCode, int resultCode, Intent data)
{

    if (requestCode == REQUEST_CODE)
    {
        Toast.makeText(GetPermission.this, "Windows Overlay Permission is required",Toast.LENGTH_LONG).show();
        getWindowOverLayPermission();
    }
    else
    {
        startService();
    }

}
}

After that change your Manifest.xml

Hope,It will help you...