按鈕聲音問題

Question

當我啓動我的應用程序時，出現主菜單，當我點擊2個按鈕中的任何一個時，它會使按鈕發聲，然後轉到指定的佈局。我遇到的問題是，如果我從佈局返回到主屏幕並嘗試再次按下按鈕，它仍然會將我帶到佈局，但不會使按鈕響起。有任何想法嗎？謝謝您的幫助。

DragonFruitActivity.java

package com.Dragon_Fruit; 

import android.app.Activity; 
import android.content.Intent; 
import android.media.MediaPlayer; 
import android.os.Bundle; 
import android.view.View; 
import android.view.Window; 
import android.view.WindowManager; 
import android.widget.ImageButton; 

public class DragonFruitActivity extends Activity { 
    /** Called when the activity is first created. */ 
    @Override 
    public void onCreate(Bundle savedInstanceState) { 
     requestWindowFeature(Window.FEATURE_NO_TITLE); 
     getWindow().setFlags(WindowManager.LayoutParams.FLAG_FULLSCREEN, 
       WindowManager.LayoutParams.FLAG_FULLSCREEN); 
     super.onCreate(savedInstanceState); 
     setContentView(R.layout.main); 

     // ***BUTTON SOUND***// 
     final MediaPlayer buttonSound = MediaPlayer.create(
       DragonFruitActivity.this, R.raw.button_click); 

     ImageButton playbutton = (ImageButton) findViewById(R.id.playbutton); 
     playbutton.setOnClickListener(new View.OnClickListener() { 

      @Override 
      public void onClick(View arg0) { 
       arg0.setBackgroundResource(R.drawable.playbuttonselected); 
       // TODO Auto-generated method stub 
       buttonSound.start(); 
       startActivity(new Intent(DragonFruitActivity.this, 
         playbutton.class)); 
      } 

     }); 
     ImageButton settingsbutton = (ImageButton) findViewById(R.id.settingsbutton); 
     settingsbutton.setOnClickListener(new View.OnClickListener() { 

      @Override 
      public void onClick(View arg0) { 
       // TODO Auto-generated method stub 
       buttonSound.start(); 
       startActivity(new Intent(DragonFruitActivity.this, 
         settingsbutton.class)); 
      } 

     }); 
    } 
} 

更新DragonFruitActivity.java

package com.Dragon_Fruit; 

import java.io.IOException; 

import android.app.Activity; 
import android.content.Intent; 
import android.media.MediaPlayer; 
import android.os.Bundle; 
import android.view.View; 
import android.view.Window; 
import android.view.WindowManager; 
import android.widget.ImageButton; 

public class DragonFruitActivity extends Activity { 
    /** Called when the activity is first created. */ 
    @Override 
    public void onCreate(Bundle savedInstanceState) { 
     requestWindowFeature(Window.FEATURE_NO_TITLE); 
     getWindow().setFlags(WindowManager.LayoutParams.FLAG_FULLSCREEN, 
       WindowManager.LayoutParams.FLAG_FULLSCREEN); 
     super.onCreate(savedInstanceState); 
     setContentView(R.layout.main); 

     // ***BUTTON SOUND***// 
     final MediaPlayer buttonSound = MediaPlayer.create(
       DragonFruitActivity.this, R.raw.button_click); 

     ImageButton playbutton = (ImageButton) findViewById(R.id.playbutton); 
     playbutton.setOnClickListener(new View.OnClickListener() { 

      @Override 
      public void onClick(View arg0) { 
       arg0.setBackgroundResource(R.drawable.playbuttonselected); 
       // TODO Auto-generated method stub 
       try { 
        buttonSound.prepare(); 
       } catch (IllegalStateException e) { 
        // TODO Auto-generated catch block 
        e.printStackTrace(); 
       } catch (IOException e) { 
        // TODO Auto-generated catch block 
        e.printStackTrace(); 
       } 
       buttonSound.start(); 
       startActivity(new Intent(DragonFruitActivity.this, 
         playbutton.class)); 
      } 

     }); 
     ImageButton settingsbutton = (ImageButton) findViewById(R.id.settingsbutton); 
     settingsbutton.setOnClickListener(new View.OnClickListener() { 

      @Override 
      public void onClick(View arg0) { 
       // TODO Auto-generated method stub 
       try { 
        buttonSound.prepare(); 
       } catch (IllegalStateException e) { 
        // TODO Auto-generated catch block 
        e.printStackTrace(); 
       } catch (IOException e) { 
        // TODO Auto-generated catch block 
        e.printStackTrace(); 
       } 
       buttonSound.start(); 
       startActivity(new Intent(DragonFruitActivity.this, 
         settingsbutton.class)); 
      } 

     }); 
    } 
} 

logcat的

08-12 21：29：54.379：ERROR/ProfileVideoFrameDrops（5764）：PVMediaOutputNodePort ::早期0幀:: OnTime 0幀::晚0幀::總共3幀 08-12 21：29：54.379：錯誤/ ProfileVideoFrameDrops（5764）：PVMediaOutputNodePort :: Ear 0.000000％:: OnTime 19518016.000000％::晚-0.000000％ 08-12 21：29：58.652：錯誤/ ProfileVideoFrameDrops（5764）：PVMediaOutputNodePort :: Early 0 frames :: OnTime 0 frames :: Late 0 frames :: Total 3幀 08-12 21：29：58.652：錯誤/ ProfileVideoFrameDrops（5764）：PVMediaOutputNodePort :: Early 0.000000％:: OnTime 19518016.000000％:: Late -0.000000％ 08-12 21：30：01.082：ERROR/ProfileVideoFrameDrops（ 5764）：PVMediaOutputNodePort :: Early 0 frames :: OnTime 0 frames :: Late 0 frames :: Total 3 frames 08-12 21：30：01.082：ERROR/ProfileVideoFrameDrops（5764）：PVMediaOutputNodePort :: Early 0.000000％:: OnTime 19518016.000000％::後期-0.000000％

Answer 1

編輯：試試這個：

if(buttonSound.isPlaying()) { 
    buttonSound.stop(); 
} 

try { 
    buttonSound.prepare(); 
} catch (IllegalStateException e) { 
    e.printStackTrace(); 
} catch (IOException e) { 
    e.printStackTrace(); 
} 

buttonSound.start(); 

（check out Google MediaPlayer state diagram）