Take Image from Gallery and return Path

i'm trying to do this code in android-studio, but i don't understand why the selectedImageUri and selectedImagePath are both null. This is the code:

In Android-manifest i have included :

<uses-permission android:name="android.permission.CAMERA" />  
<uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE" />

this is my layout:

<Button android:text="Browse gallery"
    android:id="@+id/Button01"
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:onClick="onClick">
</Button>

and this is my java code:

public class MainActivity extends ActionBarActivity {

private static final int SELECTED_PICTURE = 1;
ImageView iv;
String filePath;

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


    public void onClick(View view) {

        // in onCreate or any event where your want the user to
        // select a file
        Intent intent = new Intent();
        intent.setType("image/*");
        intent.setAction(Intent.ACTION_GET_CONTENT);
        startActivityForResult(Intent.createChooser(intent,"Select Picture"), SELECTED_PICTURE);
       // System.out.println("sonoqui");
    }



public void onActivityResult(int requestCode, int resultCode, Intent data) {
    if (resultCode == RESULT_OK) {
       // System.out.println("sonoqui1");
        if (requestCode == SELECTED_PICTURE) {
        //    System.out.println("sonoqui2");
            Uri selectedImageUri = data.getData();
            String selectedImagePath = getPath(selectedImageUri);
            System.out.println("sonoqui25" + selectedImagePath);

         //   Log.v("IMAGE PATH====>>>> ", selectedImagePath);
        }
    }
}

public String getPath(Uri uri) {
    String[] projection = { MediaStore.Images.Media.DATA };
    Cursor cursor = managedQuery(uri, projection, null, null, null);
    int column_index = cursor
            .getColumnIndexOrThrow(MediaStore.Images.Media.DATA);
    cursor.moveToFirst();
    return cursor.getString(column_index);
}

}