Question

onCreateOptionsMenu覆盖正在给我一个错误。该代码应该以整数读取，并根据按下的按钮将其立方体或方形。在我输入逻辑之前，我没有收到错误。此外onOptionsItemSelected给出了一个错误，指出它无法解析方法。在此先感谢您的帮助！如果您在逻辑ID中也注意到错误提示，那么。

package com.firstapp.conner.squareandcube;

import android.os.Bundle;
import android.support.design.widget.FloatingActionButton;
import android.support.design.widget.Snackbar;
import android.support.v7.app.AppCompatActivity;
import android.support.v7.widget.Toolbar;
import android.view.View;
import android.view.Menu;
import android.view.MenuItem;
import android.widget.Button;
import android.widget.TextView;



public class MainActivity extends AppCompatActivity {

    private static int squared, cubed;

    Button square, cube;
    TextView tv, inputNum;
    int num1;
    String numString;


    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        Toolbar toolbar = (Toolbar) findViewById(R.id.toolbar);
        setSupportActionBar(toolbar);


        square = (Button) findViewById(R.id.square_button);
        cube = (Button) findViewById(R.id.cube_button);

        inputNum = (TextView) findViewById(R.id.editText);
        inputNum.setText(inputNum.getText());
        num1 = Integer.parseInt(inputNum.toString());

        tv = (TextView) findViewById(R.id.textView);

        Button square = (Button)findViewById(R.id.square_button);

        square.setOnClickListener(new View.OnClickListener() {
            @Override
             public void onClick(View v) {

                squared = num1 * num1;

                numString = String.valueOf(squared);
                tv.setText(numString);

                cube.setOnClickListener(new View.OnClickListener() {
                    @Override
                    public void onClick(View v) {

                        cubed = num1 * num1 * num1;

                        numString = String.valueOf(cubed);
                        tv.setText(numString);
                    }
                });


    @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_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.
        int id = item.getItemId();

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

        return super.onOptionsItemSelected(item);
    }
});}}

Answer 1

只需复制并粘贴此代码即可。有大括号错误，所以我为你解决了。

package com.firstapp.conner.squareandcube;
import android.os.Bundle;
import android.support.design.widget.FloatingActionButton;
import android.support.design.widget.Snackbar;
import android.support.v7.app.AppCompatActivity;
import android.support.v7.widget.Toolbar;
import android.view.View;
import android.view.Menu;
import android.view.MenuItem;
import android.widget.Button;
import android.widget.TextView;



public class MainActivity extends AppCompatActivity {

private static int squared, cubed;

Button square, cube;
TextView tv, inputNum;
int num1;
String numString;
setContentView(R.layout.activity_main);
    Toolbar toolbar = (Toolbar) findViewById(R.id.toolbar);
    setSupportActionBar(toolbar);


    square = (Button) findViewById(R.id.square_button);
    cube = (Button) findViewById(R.id.cube_button);

    inputNum = (TextView) findViewById(R.id.editText);
    inputNum.setText(inputNum.getText());
    num1 = Integer.parseInt(inputNum.toString());

    tv = (TextView) findViewById(R.id.textView);

    Button square = (Button)findViewById(R.id.square_button);

    square.setOnClickListener(new View.OnClickListener() {
        @Override
         public void onClick(View v) {

            squared = num1 * num1;

            numString = String.valueOf(squared);
            tv.setText(numString);
        }
        });
    cube.setOnClickListener(new View.OnClickListener() {
        @Override
        public void onClick(View v) {

            cubed = num1 * num1 * num1;

            numString = String.valueOf(cubed);
            tv.setText(numString);
        }
    });

}
@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_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.
    int id = item.getItemId();

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

    return super.onOptionsItemSelected(item);
}
}

方法没有从超类覆盖？

1 个答案: