在Android应用程序中播放mp3文件

Question

我正在制作一个 Android 应用程序，一旦收到包含“PhoneAlarm”的短信，它将播放 mp3 文件。 这是对我有用的最终代码。

请注意：“我不会使用这里的所有编码” 看看我的代码：

import java.io.BufferedReader;
import java.io.File;
import java.io.FileReader;
import java.io.IOException;

import android.content.BroadcastReceiver;
import android.content.Context;
import android.content.Intent;
import android.os.Bundle;
import android.os.Environment;
import android.telephony.gsm.SmsMessage;
import android.widget.DigitalClock;
import android.widget.Toast;
import android.media.MediaPlayer;

public class IncomingSmsCaptureApp extends BroadcastReceiver {
MediaPlayer mp1;
@Override
public void onReceive(Context context, Intent intent) {
File sdcard = Environment.getExternalStorageDirectory();

//Get the text file
File file = new File(sdcard,"Notes\file.txt");

//Read text from file
String text = new String();

try {
  BufferedReader br = new BufferedReader(new FileReader(file));
  String line;

  while ((line = br.readLine()) != null) {
  }
}
catch (IOException e) {
  //You'll need to add proper error handling here
}
//---get the SMS message passed in---
Bundle bundle = intent.getExtras();       
SmsMessage[] msgs = null;
String str = "";     
String Message = "";
if (bundle != null)
{
//---retrieve the SMS message received---
Object[] pdus = (Object[]) bundle.get("pdus");
msgs = new SmsMessage[pdus.length];           
for (int i=0; i<msgs.length; i++){
msgs[i] = SmsMessage.createFromPdu((byte[])pdus[i]);               
str += "SMS from " + msgs[i].getOriginatingAddress();                    
str += " :";
str += msgs[i].getMessageBody().toString();
str += "\n";       
Message = msgs[i].getMessageBody().toString();
}
//---display the new SMS message---
Toast.makeText(context, str, Toast.LENGTH_SHORT).show();
if (Message == "PhoneAlarm") {
//Play alarm sound
mp1 = MediaPlayer.create(context, R.raw.alarm);
mp1.start();
}
}       
}
}

Answer 1

setDataSource() 方法需要媒体文件的字符串路径，而不仅仅是资源 ID，您可以使用 create(context, resid) 相反，它将是准备好播放你的声音：

//When creating your player:
mp1 = MediaPlayer.create(context, R.raw.alarm);

//When playing sound, note that prepare() should not be called:
mp1.start();

//When you don't need the player anymore:
mp1.release();