为什么我的程序在启动时崩溃了？

Question

我认为它归功于OnClickButtonListener。之前，当我点击按钮时，应用程序会崩溃，但现在我已经为按钮添加了一个目的，或者至少尝试过，它在启动时崩溃了。

public class TimeSelection extends AppCompatActivity 
{
    private static Button button_sbm;

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

    public void OnClickButtonListener()
    {
        button_sbm = (Button)findViewById(android.R.id.button1);
        button_sbm.setOnClickListener
                (
                        new View.OnClickListener()
                        {
                            @Override
                            public void onClick(View v)
                            {

                                Intent intent = new Intent("amardhebardevelopments.myapplication.UnitedStates");
                                startActivity(intent);
                            }
                        }



                );
    }

    @Override
    public boolean onCreateOptionsMenu(Menu menu) {
        // Inflate the menu; this adds items to the action bar if it is present.
        getMenuInflater().inflate(R.menu.menu_time_selection, 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.
        int id = item.getItemId();

        //noinspection SimplifiableIfStatement
        if (id == R.id.action_settings) {
            return true;
        }

        return super.onOptionsItemSelected(item);
    }
}

Answer 1

尝试替换

button_sbm = (Button)findViewById(android.R.id.button1);

与

button_sbm = (Button)findViewById(R.id.button1);