Android Studio : displayimage

MainActivity.java

package com.thaiall.www.displayimage;

import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.text.TextUtils;
import android.widget.ImageView;
import android.widget.TextView;
import android.view.View;
import android.widget.Toast;
import android.content.res.Resources;

public class MainActivity extends AppCompatActivity {
ImageView mImageView;
TextView mTextView;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);

mTextView = (TextView) findViewById(R.id.textview);
mImageView = (ImageView) findViewById(R.id.imageView);
mImageView.setClickable(true);
mImageView.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
int getV = Integer.valueOf(mTextView.getText().toString()) + 1;
if(getV > 5) { getV = 1; }
String[] List1 ={"เลื่อนไปภาพต่อไป ภาพที่ ",String.valueOf(getV)};
String s = TextUtils.join(" ", List1);
// String.join("","",""); was denied
Toast.makeText(MainActivity.this, s , Toast.LENGTH_LONG).show();

String[] List2 ={"lp0",String.valueOf(getV)};
s = TextUtils.join("", List2);
Resources res = getResources();
String mDrawableName = s;
int resID = res.getIdentifier(mDrawableName , "drawable", getPackageName());
mImageView.setImageResource(resID);
// mImageView.setImageResource(R.drawable.lp02);

mTextView.setText(String.valueOf(getV));
}
});
}
}