開始的MediaPlayer - 在語句點擊錯誤mp.Start（） - 空異常埃羅

Question

請給我建議，如何糾正這個錯誤，

這是因爲Android的構建目標的，它設置爲4.2.2

logcat的

05-01 02:31:01.081: E/AndroidRuntime(1124): Caused by: java.lang.NullPointerException 
05-01 02:31:01.081: E/AndroidRuntime(1124):  at com.vpl.ramrevhashu.medicaplayerfunmeth.Splash.onCreate(Splash.java:19) 
05-01 02:31:01.081: E/AndroidRuntime(1124):  at android.app.Activity.performCreate(Activity.java:5008) 
05-01 02:31:01.081: E/AndroidRuntime(1124):  at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1079) 
05-01 02:31:01.081: E/AndroidRuntime(1124):  at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2023) 
05-01 02:31:01.081: E/AndroidRuntime(1124):  ... 11 more 
05-01 02:31:08.240: I/Process(1124): Sending signal. PID: 1124 SIG: 9< 

代碼

import android.app.Activity; 
import android.content.Intent; 
import android.media.MediaPlayer; 
import android.os.Bundle; 



public class Splash extends Activity{ 

    MediaPlayer ourSound; 

    @Override 
    protected void onCreate(Bundle SplashPage) { 
     // TODO Auto-generated method stub 
     super.onCreate(SplashPage); 
     setContentView(R.layout.splash); 
     ourSound = new MediaPlayer(); 
     ourSound = MediaPlayer.create(Splash.this, R.raw.song); 
     ourSound.start(); //(Error at this stmt) 

     Thread timer = new Thread(){ 

      public void run(){ 
       try{ 
        sleep(5000); 
       } catch(InterruptedException e){ 
        e.printStackTrace(); 
       } finally{ 
        Intent startPage = new Intent("com.vpl.ramrevhashu.medicaplayerfunmeth"); 
        startActivity(startPage); 
       } 
      } 
     }; 
     timer.start(); 

    } 

    @Override 
    protected void onPause() { 
     // TODO Auto-generated method stub 

     super.onPause(); 
     ourSound.release(); 
     finish(); 
    } 


} 

Answer 1

嘗試......它的工作原理

static Boolean audioPlay = false; 
static MediaPlayer mediaPlayer = new MediaPlayer(); 

// Audio play Function 
public static void playAudio(int val) 
{ 
    if (MainActivity.audioPlay) 
    { 
     if (!MainActivity.mediaPlayer.isPlaying()) 
     { 
      MainActivity.mediaPlayer.reset(); 
      MainActivity.mediaPlayer = MediaPlayer.create(MainActivity.this, val); 

      try 
      { 
       MainActivity.mediaPlayer.start(); 
       MainActivity.mediaPlayer.setLooping(false); 
      } 
      catch (IllegalStateException e) 
      { 
       // TODO Auto-generated catch block 
       e.printStackTrace(); 
      } 
     } 
     MainActivity.audioPlay = true; 
    } 
} 

喚起或玩一個名爲從「原始」文件夾「歌」的音樂文件，這樣調用函數....

playAudio(R.raw.song);