小编09E*_*Emi的帖子

我正在进行A Level计算,我正在尝试为我的Comp 4项目制作应用程序.我用按钮完成的所有其他类似乎工作正常,但主菜单上的按钮不起作用.

public class MainActivity extends AppCompatActivity {

Button bLogin;
Button bProducts;
EditText etName, etAge, etUsername;

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

@Override
protected void onStart() {
    super.onStart();
}

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

@Override
public boolean onOptionsItemSelected(MenuItem item) {
    int id= item.getItemId();
    switch (id) {
    case R.id.bLogin:
        break;
    case R.id.bProducts:
        break;
    }
    return super.onOptionsItemSelected(item);
}

public void ProductsOnClick(View b) {
    startActivity(new Intent(".Products"));
    switch (b.getId()) {
    case R.id.bProducts:
    } …