Question

I’ve been coding for a bit trying to link two activties and I’m nearly there but I’ve run into a problem.

A line of my coding is unreachable. Can anyone explain why?

package com.example.twolink

@Override
public void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_main);
    getActionBar().setDisplayHomeAsUpEnabled(true);
}

@Override
public boolean onCreateOptionsMenu(Menu menu) {
    getMenuInflater().inflate(R.menu.activity_main, menu);
    return true;
}  

@Override
public boolean onOptionsItemSelected(MenuItem item) {
    switch (item.getItemId()) {
        case android.R.id.home:
            NavUtils.navigateUpFromSameTask(this);
            return true;
    }
    return super.onOptionsItemSelected(item);

    Button button2 = (Button) findViewById(R.id.button2);
    button2.setOnClickListener(new OnClickListener() {          
        public void onClick(View v) {
            startActivity(new Intent(getApplicationContext(), MainActivity2.class));
            finish();
        }   
    });
} 

Answer 1

Initialize your Button on the onCreate method like so :

@Override
public void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_main);
    Button button2 = (Button) findViewById(R.id.button2);
    button2.setOnClickListener(new OnClickListener() {          

    public void onClick(View v) {
        startActivity(new Intent(getApplicationContext(), MainActivity2.class));
        finish();
    }  
    getActionBar().setDisplayHomeAsUpEnabled(true);
}

If you want to hide the button initially, use the setVisibility(View.GONE) to toggle the button visibility. Then, if you want to show it later, you can setVisibility(View.VISIBLE) elsewhere.