如何解决这些错误？ [英] How do i fix the errors?

问题描述

我看了你好Android的book.The计划将发挥我在原始文件夹中复制一个声音，但该程序没有运行，并给出错误。

I read Hello Android book.The program will play a sound that i copy in raw folder but the program is not run and gives errors.

错误：

activity_main不能得到解决或不是一个字段

activity_main cannot be resolved or is not a field

温度不能得到解决或不是一个字段

temp cannot be resolved or is not a field

Audio.java

Audio.java

package org.example.audio;
import android.app.Activity;
import android.media.MediaPlayer;
import android.view.KeyEvent;
import android.os.Bundle;

public class Audio extends Activity{
    private MediaPlayer up;

    @Override
    public void onCreate(Bundle savedInstanceState){
        super.onCreate(savedInstanceState);
  setContentView(R.layout.activity_main);
        up=MediaPlayer.create(this,R.raw.Guilty);
    }

    @Override
    public boolean onKeyDown(int keyCode,KeyEvent event){
  MediaPlayer mp;
      switch(keyCode){
  case KeyEvent.KEYCODE_DPAD_UP:
      mp=up;
      break;
  default:
      return super.onKeyDown(keyCode, event);
}
mp.seekTo(0);
mp.start();
return true;
    }
}

请帮我，我修复错误。
干杯。

Please help me that i fix the errors. Cheers.

推荐答案

删除行

import android.R; 

和导入R代表相应的包

在此行

setContentView(R.layout.activity_main);

删除到的setContentView整条生产线和类型（R并给予Ctrl +空格键，你会要求进口几包其中你需要导入其中包含项目名称（而不是android.R）包

remove the entire line and type till setContentView(R and give a ctrl+space . You will asked to import few packages among which you need to import a package which contains your project name ( and not android.R)

否则删除线进口android.R;简单地清理项目并构建它

or else remove the line import android.R; and simply clean the project and build it

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