android - OnClickListener 不适用于 Fragment

Question

我试用 Fragment 时发现 OnClickListener 有问题。任何人都可以帮忙吗？

主 Activity .java

public class MainActivity extends AppCompatActivity {

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        frag_one frag1=new frag_one();
        FragmentManager manager=getSupportFragmentManager();
        FragmentTransaction transaction=manager.beginTransaction();
        transaction.add(R.id.top,frag1,"");
        transaction.commit();
    }
}

frag_one.java

public class frag_one extends Fragment{
    @Nullable
    @Override
    public View onCreateView(LayoutInflater inflater, @Nullable ViewGroup container, @Nullable Bundle savedInstanceState) {
        return  inflater.inflate(R.layout.activity_frag_one,container,false);
    }

    public class calculator extends AppCompatActivity implements View.OnClickListener {
        TextView get_result;
        EditText get_num1;
        EditText get_num2;
        Button get_button;
        @Override
        protected void onCreate(Bundle savedInstanceState) {
            super.onCreate(savedInstanceState);
            setContentView(R.layout.activity_frag_one);
            get_result=(TextView)findViewById(R.id.result);
            get_num1=(EditText) findViewById(R.id.num1);
            get_num2=(EditText) findViewById(R.id.num2);
            get_button=(Button)findViewById(R.id.submit);
            get_button.setOnClickListener(this);
        }
        public void onClick(View v) {
            int num1=Integer.parseInt((get_num1.getText().toString()));
            int num2=Integer.parseInt((get_num2.getText().toString()));
            int sum=num1+num2;
            get_result.setText(Integer.toString(sum));
        }
    }
}

当我在不使用 Fragment 的情况下进行正常 Activity 时。当我单击按钮时，计算有效。但是当我移动到 Fragment 时，它不起作用。请帮忙!谢谢

Answer 1

您创建了第二个 Activity，它使用 Fragment 的布局而不是实际将逻辑放入 Fragment 类中....

public class frag_one extends Fragment implements View.OnClickListener {

    TextView get_result;
    EditText get_num1;
    EditText get_num2;
    Button get_button;

    @Nullable
    @Override
    public View onCreateView(LayoutInflater inflater, @Nullable ViewGroup container, @Nullable Bundle savedInstanceState) {
        View rootView = inflater.inflate(R.layout.activity_frag_one,container,false);

        get_result=(TextView)rootView.findViewById(R.id.result);
        get_num1=(EditText)rootView.findViewById(R.id.num1);
        get_num2=(EditText) rootView.findViewById(R.id.num2);
        get_button=(Button)rootView.findViewById(R.id.submit);
        get_button.setOnClickListener(this);

        return rootView;
    }

    public void onClick(View v) {
        // TODO: Check v.getId() == R.id.submit
        int num1=Integer.parseInt((get_num1.getText().toString()));
        int num2=Integer.parseInt((get_num2.getText().toString()));
        int sum=num1+num2;
        get_result.setText(Integer.toString(sum));
    }
}