Java programming with android SDK and Eclipse

Question

I am working on a android project using the android sdk and eclipse. I am having problems with my java code so I was wondering if anyone who knows Java can you help me with my code?

Here is my code. These are where im having problems error ->

public class MainActivity extends ActionBarActivity {
 private static final String R = null;
 int counter;
 Button add, sub;
 TextView display;
 @Override
 public void onCreate(Bundle savedInstanceState) {
 super.onCreate(savedInstanceState);
error -> setContentView(R.layout.activity_main);
 counter = 0;
error -> add = (Button) findViewById(R.id.button1);
error -> sub = (Button) findViewById(R.id.button2);
error -> display = (TextView) findViewById(R.id.text);
 add.setOnClickListener(new View.OnClickListener() {
 @Override
 public void onClick(View v) {
 // TODO Auto-generated method stub
 counter++;
 display.setText("Your Total is" + counter);
 }
 });
 sub.setOnClickListener(new View.OnClickListener() {
 @Override
 public void onClick(View v) {
 // TODO Auto-generated method stub
 counter--;
 display.setText("Your total is " + counter);
 }
 });
 }
 @Override
 public boolean onCreateOptionsMenu(Menu menu) {
 // Inflate the menu; this adds items to the action bar if it is present.
error -> getMenuInflater().inflate(R.menu.main, menu);
 return true;
 }
 @Override
 public boolean onOptionsItemSelected(MenuItem item) {
 // Handle action bar item clicks here. The action bar will
 // automatically handle clicks on the Home/Up button, so long
 // as you specify a parent activity in AndroidManifest.xml.`enter code here`
 int id = item.getItemId();
error -> if (id == R.id.action_settings) {
 return true;
 }
 return super.onOptionsItemSelected(item);
 }
}

• AtanuCSE: Please add to the question, what kind of problems you are having.

Answer 1

Remove private static final String R = null; and add an import for android.R:

import android.R;

You're trying to call methods on the android.R class, but you're not importing it correctly and trying to declare a static field with the same name as a String instead. This makes your compiler sad.