checkIfPhoneIsSilent（）方法undefined

Question

我正在關注Android Development for Dummies中的示例應用程序，這是一個簡單的應用程序，可將鈴聲模式從靜音切換到正常。出於某種原因，當我打電話的checkIfPhoneIsSilent方法，它強調了紅色與錯誤消息「checkIfPhoneIsSilent是未定義類型主要方法」這是到目前爲止的代碼：

import android.app.Activity; 

import android.graphics.drawable.Drawable; 

import android.media.AudioManager; 

import android.view.View; 

import android.view.View.OnClickListener; 

import android.os.Bundle; 

import android.widget.Button; 

import android.widget.ImageView; 

public class Main extends Activity { 

    private AudioManager mAudioManager; 
    private boolean mPhoneIsSilent; 

    @Override 
    public void onCreate(Bundle savedInstanceState) { 
     super.onCreate(savedInstanceState); 
     setContentView(R.layout.main); 

     mAudioManager = (AudioManager)getSystemService(AUDIO_SERVICE); 
     checkIfPhoneIsSilent(); 
     setButtonClickListener(); 
    } 



    private void setButtonClickListener() { 
     Button toggleButton = (Button)findViewById(R.id.toggleButton); 
     toggleButton.setOnClickListener(new OnClickListener() { 

       public void onClick(View v) { 
        if (mPhoneIsSilent) { 
         //change back to normal 
         mAudioManager 
          .setRingerMode(AudioManager.RINGER_MODE_NORMAL); 
        } 

       } 
     }); 
    } 
} 

Answer 1

checkIfPhoneIsSilent方法是添加此方法。你在你的代碼中缺少它：

private void checkIfPhoneIsSilent() { 
int ringerMode = mAudioManager.getRingerMode(); 
if (ringerMode == AudioManager.RINGER_MODE_SILENT) { 
mPhoneIsSilent = true; 
} else { 
mPhoneIsSilent = false; 
} 
}