Question

我是编程新手，我正在使用eclipse进行编程。

我正在创建一个简单的音板，但是我收到警告“未使用局部变量SoundButton38的值”，但我想使用该变量。

SoundButton1-37正在运行且没有错误，但38-63确实有警告。我不确定是什么导致了它以及它为什么会发生。

这是我的代码片段，警告即将出现（35,36和37没有警告：

            Button SoundButton35 = (Button)findViewById(R.id.sound35);
            SoundButton35.setOnClickListener(new OnClickListener() {

        public void onClick(View v) {
            mSoundManager.playSound(35);

        }
    });
            Button SoundButton36 = (Button)findViewById(R.id.sound36);
            SoundButton36.setOnClickListener(new OnClickListener() {

        public void onClick(View v) {
            mSoundManager.playSound(36);

        }
            });

            Button SoundButton37 = (Button)findViewById(R.id.sound37);
            SoundButton35.setOnClickListener(new OnClickListener() {

        public void onClick(View v) {
            mSoundManager.playSound(37);

        }
    });

            Button SoundButton38 = (Button)findViewById(R.id.sound38);
            SoundButton35.setOnClickListener(new OnClickListener() {

        public void onClick(View v) {
            mSoundManager.playSound(38);

        }
    });

这是我的代码的开头

package com.soundboardtest;

import com.soundboardtest.R;
import com.soundboardtest.SoundManager;

import android.app.Activity;
import android.os.Bundle;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.Button;

public class Soundboard extends Activity {
    private SoundManager mSoundManager;

/** Called when the activity is first created. */
@Override
public void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_soundboardtest);

    mSoundManager = new SoundManager();
    mSoundManager.initSounds(getBaseContext());
    mSoundManager.addSound(1, R.raw.sound1);
    mSoundManager.addSound(2, R.raw.sound2);
    mSoundManager.addSound(3, R.raw.sound3);
    mSoundManager.addSound(4, R.raw.sound4);
    mSoundManager.addSound(5, R.raw.sound5);
    mSoundManager.addSound(6, R.raw.sound6);
    mSoundManager.addSound(7, R.raw.sound7);
    mSoundManager.addSound(8, R.raw.sound8);
    mSoundManager.addSound(9, R.raw.sound9);
    mSoundManager.addSound(10, R.raw.sound10);
    mSoundManager.addSound(11, R.raw.sound11);
    mSoundManager.addSound(12, R.raw.sound12);
    mSoundManager.addSound(13, R.raw.sound13);
    mSoundManager.addSound(14, R.raw.sound14);
    mSoundManager.addSound(15, R.raw.sound15);
    mSoundManager.addSound(16, R.raw.sound16);
    mSoundManager.addSound(17, R.raw.sound17);
    mSoundManager.addSound(18, R.raw.sound18);
    mSoundManager.addSound(19, R.raw.sound19);
    mSoundManager.addSound(20, R.raw.sound20);
    mSoundManager.addSound(21, R.raw.sound21);
    mSoundManager.addSound(22, R.raw.sound22);
    mSoundManager.addSound(23, R.raw.sound23);
    mSoundManager.addSound(24, R.raw.sound24);
    mSoundManager.addSound(25, R.raw.sound25);
    mSoundManager.addSound(26, R.raw.sound26);
    mSoundManager.addSound(27, R.raw.sound27);
    mSoundManager.addSound(28, R.raw.sound28);
    mSoundManager.addSound(29, R.raw.sound29);
    mSoundManager.addSound(30, R.raw.sound30);
    mSoundManager.addSound(31, R.raw.sound31);
    mSoundManager.addSound(32, R.raw.sound32);
    mSoundManager.addSound(33, R.raw.sound33);
    mSoundManager.addSound(34, R.raw.sound34);
    mSoundManager.addSound(35, R.raw.sound35);
    mSoundManager.addSound(36, R.raw.sound36);
    mSoundManager.addSound(37, R.raw.sound37);
    mSoundManager.addSound(38, R.raw.sound38);
    mSoundManager.addSound(39, R.raw.sound39);
    mSoundManager.addSound(40, R.raw.sound40);
    mSoundManager.addSound(41, R.raw.sound41);
    mSoundManager.addSound(42, R.raw.sound42);
    mSoundManager.addSound(43, R.raw.sound43);
    mSoundManager.addSound(44, R.raw.sound44);
    mSoundManager.addSound(45, R.raw.sound45);
    mSoundManager.addSound(46, R.raw.sound46);
    mSoundManager.addSound(47, R.raw.sound47);
    mSoundManager.addSound(48, R.raw.sound48);
    mSoundManager.addSound(49, R.raw.sound49);
    mSoundManager.addSound(50, R.raw.sound50);
    mSoundManager.addSound(51, R.raw.sound51);
    mSoundManager.addSound(52, R.raw.sound52);
    mSoundManager.addSound(53, R.raw.sound53);
    mSoundManager.addSound(54, R.raw.sound54);
    mSoundManager.addSound(55, R.raw.sound55);
    mSoundManager.addSound(56, R.raw.sound56);
    mSoundManager.addSound(57, R.raw.sound57);
    mSoundManager.addSound(58, R.raw.sound58);
    mSoundManager.addSound(59, R.raw.sound59);
    mSoundManager.addSound(60, R.raw.sound60);
    mSoundManager.addSound(61, R.raw.sound61);
    mSoundManager.addSound(62, R.raw.sound62);
    mSoundManager.addSound(63, R.raw.sound63);

感谢您的帮助，我无法为此找到一个好的答案。

Answer 1

 Button SoundButton38 = (Button)findViewById(R.id.sound38);
            SoundButton35.setOnClickListener(new OnClickListener() {

在这里看起来像一个错字，我认为应该是

 SoundButton38.setOnClickListener(new OnClickListener() {

Similiarly

 Button SoundButton37 = (Button)findViewById(R.id.sound37);
            SoundButton35.setOnClickListener(new OnClickListener() {

应该是

SoundButton37.setOnClickListener(new OnClickListener() {

Answer 2

您只声明并初始化它，而不是在

的任何地方使用它

Button SoundButton38 = (Button)findViewById(R.id.sound38);

你可能想要

SoundButton38.setOnClickListener(new OnClickListener() { //  SoundButton38 not 35

    public void onClick(View v) {
        mSoundManager.playSound(38);

    }
});

类似地

    SoundButton37.setOnClickListener(new OnClickListener() {

    public void onClick(View v) {
        mSoundManager.playSound(37);

    }
});

“没有使用局部变量SoundButton38的值”但我想使用它吗？

2 个答案: