按钮声音问题

Question

当我启动我的应用程序时，主菜单出现，当我单击2个按钮中的任何一个时，它会使按钮发声，然后转到指定的布局。我遇到的问题是，如果我从布局返回到主屏幕并尝试再次按下按钮，它仍然会将我带到布局但不会使按钮发出声音。有任何想法吗？谢谢你的帮助。

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));
            }

        });
    }
}

更新了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 :: Early 0 frames :: OnTime 0 frames :: Late 0 frames :: Total 3 frames 08-12 21：29：54.379：ERROR / ProfileVideoFrameDrops（5764）：PVMediaOutputNodePort ::早期0.000000％:: OnTime 19518016.000000％:: Late -0.000000％ 08-12 21：29：58.652：ERROR / ProfileVideoFrameDrops（5764）：PVMediaOutputNodePort ::早期0帧:: OnTime 0帧::延迟0帧::总共3帧 08-12 21：29：58.652：ERROR / ProfileVideoFrameDrops（5764）：PVMediaOutputNodePort ::早期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 ::早期0.000000％:: OnTime 19518016.000000％:: Late -0.000000％

Answer 1

编辑：试试这个：

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）