如何在对话框中点击正面按钮时从开始播放音频背景？

问题描述：

我正在创建一个简单的多项选择测验应用程序（从教程，我想给它一个背景音乐），我想问的是如何重播背景音频/媒体播放器，当我点击.setPositiveButton当答案是不正确的（不是一个独立的按钮），所以当我想按对话框按钮重复MainActivity，正在运行的媒体播放器将停止，并从重新开始，这里是我的代码：如何在对话框中点击正面按钮时从开始播放音频背景？

package com.fernando.android; 
 

 
import android.content.DialogInterface; 
 
import android.content.Intent; 
 
import android.support.v7.app.AlertDialog; 
 
import android.support.v7.app.AppCompatActivity; 
 
import android.os.Bundle; 
 
import android.view.View; 
 
import android.widget.Button; 
 
import android.widget.TextView; 
 
import android.media.MediaPlayer; 
 
import java.util.Random; 
 

 
public class MainActivity extends AppCompatActivity { 
 

 
    Button jawab1, jawab2, jawab3, jawab4; 
 

 
    TextView nilai, pertanyaan; 
 

 
    private Pertanyaan mPertanyaan = new Pertanyaan(); 
 

 
    private String mJawab; 
 
    private int mNilai = 0; 
 
    private int mPertanyaanLength = mPertanyaan.mPertanyaan.length; 
 

 
    Random r; 
 

 
    @Override 
 
    protected void onCreate(Bundle savedInstanceState) { 
 
     super.onCreate(savedInstanceState); 
 
     setContentView(R.layout.activity_main); 
 

 
     MediaPlayer mp; 
 

 
     mp = MediaPlayer.create(this, R.raw.canon); 
 
     mp.setLooping(false); 
 
     mp.setVolume(0,7); 
 
     mp.start(); 
 

 
     r = new Random(); 
 

 
     jawab1 = (Button) findViewById (R.id.jawab1); 
 
     jawab2 = (Button) findViewById (R.id.jawab2); 
 
     jawab3 = (Button) findViewById (R.id.jawab3); 
 
     jawab4 = (Button) findViewById (R.id.jawab4); 
 

 
     nilai = (TextView) findViewById (R.id.nilai); 
 
     pertanyaan = (TextView) findViewById (R.id.pertanyaan); 
 

 
     nilai.setText("Nilai : " + mNilai); 
 

 
     updatePertanyaan(r.nextInt(mPertanyaanLength)); 
 

 
     jawab1.setOnClickListener (new View.OnClickListener() { 
 
      @Override 
 
      public void onClick(View view) { 
 
       if(jawab1.getText() == mJawab) { 
 
        mNilai++; 
 
        nilai.setText("Nilai : " + mNilai); 
 
        updatePertanyaan(r.nextInt(mPertanyaanLength)); 
 
       } else { 
 
        Tamat(); 
 
       } 
 
      } 
 
     }); 
 

 
     jawab2.setOnClickListener (new View.OnClickListener() { 
 
      @Override 
 
      public void onClick(View view) { 
 
       if(jawab2.getText() == mJawab) { 
 
        mNilai++; 
 
        nilai.setText("Nilai : " + mNilai); 
 
        updatePertanyaan(r.nextInt(mPertanyaanLength)); 
 
       } else { 
 
        Tamat(); 
 
       } 
 
      } 
 
     }); 
 

 
     jawab3.setOnClickListener (new View.OnClickListener() { 
 
      @Override 
 
      public void onClick(View view) { 
 
       if(jawab3.getText() == mJawab) { 
 
        mNilai++; 
 
        nilai.setText("Nilai : " + mNilai); 
 
        updatePertanyaan(r.nextInt(mPertanyaanLength)); 
 
       } else { 
 
        Tamat(); 
 
       } 
 
      } 
 
     }); 
 

 
     jawab4.setOnClickListener (new View.OnClickListener() { 
 
      @Override 
 
      public void onClick(View view) { 
 
       if(jawab4.getText() == mJawab) { 
 
        mNilai++; 
 
        nilai.setText("Nilai : " + mNilai); 
 
        updatePertanyaan(r.nextInt(mPertanyaanLength)); 
 
       } else { 
 
        Tamat(); 
 
       } 
 
      } 
 
     }); 
 
    } 
 

 
    private void updatePertanyaan(int num) { 
 
     pertanyaan.setText(mPertanyaan.getPertanyaan(num)); 
 
     jawab1.setText(mPertanyaan.getPilih1(num)); 
 
     jawab2.setText(mPertanyaan.getPilih2(num)); 
 
     jawab3.setText(mPertanyaan.getPilih3(num)); 
 
     jawab4.setText(mPertanyaan.getPilih4(num)); 
 

 
     mJawab = mPertanyaan.getJawabannya(num); 
 

 
    } 
 

 
    private void Tamat(){ 
 

 

 
     AlertDialog.Builder alertDialogBuilder = new AlertDialog.Builder(MainActivity.this); 
 
     alertDialogBuilder 
 
       .setMessage("Kerja Bagus!!! Nilaimu " + mNilai + " Poin...") 
 
       .setCancelable(false) 
 
       .setPositiveButton("ULANGI LAGI", 
 
       //i want to replay the audio when pressing the "ULANGI LAGI" dialog btn 
 
         new DialogInterface.OnClickListener() { 
 
          @Override 
 
          public void onClick(DialogInterface dialog, int which) 
 
          { 
 
           startActivity(new Intent(getApplicationContext(), MainActivity.class)); 
 
          } 
 
         }) 
 
       .setNegativeButton("KELUAR", 
 
         new DialogInterface.OnClickListener() { 
 
          @Override 
 
          public void onClick(DialogInterface dialog, int which) { 
 
           finish(); 
 

 
          } 
 
         }); 
 
     AlertDialog alertDialog = alertDialogBuilder.create(); 
 
     alertDialog.show(); 
 
    } 
 
}

答

只要让你的MediaPlayer对象全局变量（OnCreate之外像你的butto ns）并在对话框正面的按钮点击监听器上再次启动音乐。

MediaPlayer mp;

并在您的积极按钮侦听，

.setPositiveButton("ULANGI LAGI", new DialogInterface.OnClickListener() { 
    @Override 
    public void onClick(DialogInterface dialog, int which){ 
     // your code 
     if (mp != null) { 
     mp.start(); 
     }      
    } 
})

如何在对话框中点击正面按钮时从开始播放音频背景？

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