MediaPlayer not Plyaing FileDescriptor problems

Rizza · by **Rizza** » Fri Nov 20, 2009 5:11 pm

I have an Activity that dynamically creates a group of radio buttons, using the Asset Manager, and then assigns the file to the Tag portion of the radio button. The Listener for these radio buttons, then looks at the Tag, to get the filename, which is used by the asset file descriptor to get the fileDesc

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AssetFileDescriptor mgrFileDesc = mgr.openFd("Sounds/" + grp.getChildAt(chkId).getTag().toString());
 
FileDescriptor fd = mgrFileDesc.getFileDescriptor();
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If i run a toast Message here i see that the fd.toString() returns:

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java.io.FileDescriptor@44767fc12    
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with the number/letters after the @chaning each time.

But the MediaPlayer throws an IO Exception, when i attempt to open this fd, if i toast the e.getMessage(), it returns:

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 Prepare Failed.:status =0x1.
Parsed in 0.032 seconds,  using GeSHi 1.0.8.4

I do notice however, that every time, i go from clicking one button, to another and then back to that same button, that the FileDescriptor, is different. Not just between files, but between clicks as well.

I am able to get the MediaPlayer to play files that are stored in R.raw but i cant reference those dynamically, so i'm a little confused.

i'm not sure how to debug it from here, so anyhelp would be greatly appreciated.

Also, in a nut shell, i want to dynamically generate the UI, & eventHandlers to play selected file, for an unlimited number of files in my assets directory. Unlimitied meaning, i dont want to hard code those filenames.

My code is below, i've left out just my package name....

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import java.io.*;
 
import android.app.Activity;
 
import android.os.Bundle;
 
import android.widget.ScrollView;
 
import android.widget.LinearLayout;
 
import android.widget.RadioGroup;
 
import android.widget.Toast;
 
import android.widget.RadioGroup.OnCheckedChangeListener;
 
import android.media.MediaPlayer;
 
import android.widget.RadioButton;
 
import android.widget.TextView;
 
import android.content.res.*;
 
public class TWSSConfig extends Activity {
 
    @Override
 
    public void onCreate(Bundle savedInstanceState) {
 
        super.onCreate(savedInstanceState);
 
                AssetManager mgr = getAssets();   
 
        //Start by creating our dynamic view of the file list
 
        ScrollView scrView = new ScrollView(this);
 
        LinearLayout linLay = new LinearLayout(this);
 
        //Now define some properties for these layout values
 
       linLay.setOrientation(LinearLayout.VERTICAL);
 
       //Set the TextView
 
       TextView txtTitleArea = new TextView(this);
 
       txtTitleArea.setTextAppearance(this, android.R.style.TextAppearance_Medium);
 
       txtTitleArea.setText(R.string.greeting);
 
       linLay.addView(txtTitleArea);    
 
       //Add a RadioGroup Since for now its only one option
 
       RadioGroup rdGroup = new RadioGroup(this);
 
       //Now use our file list to create all buttons for this group and set all 
 
       try {
 
                String list[] = mgr.list("Sounds");
 
                if (list != null)
 
                        for (int i=0; i<list.length; ++i)
 
                        {
 
                        //Add a group button for files
 
                        RadioButton rdBut = new RadioButton(this);
 
                        //Applies an id to the chkBox
 
                        rdBut.setId(i);
 
                        rdBut.setTag(list[i]);
 
                        rdBut.setText(list[i]); 
 
                        rdGroup.addView(rdBut);                 
 
                        }
 
            } catch (IOException e) {
 
                Toast.makeText(getBaseContext(), "List error: can't list" + "/assets/Sounds" , Toast.LENGTH_SHORT).show();
 
            }       
 
      //Add Listener 
 
       rdGroup.setOnCheckedChangeListener(new OnCheckedChangeListener(){
 
           public void onCheckedChanged(RadioGroup grp, int chkId){
 
                   //So now we know which chkBox is checked, so now we want to set that 
 
                   //play that file for the user                   
 
               try {
 
                           AssetManager mgr = getAssets();   
 
                   AssetFileDescriptor mgrFileDesc = mgr.openFd("Sounds/" + grp.getChildAt(chkId).getTag().toString());
 
                   FileDescriptor fd = mgrFileDesc.getFileDescriptor();
 
                       MediaPlayer mPlay = new MediaPlayer();                  
 
                       mPlay.setDataSource(fd);
 
                       Toast.makeText(getBaseContext(),fd.toString() , Toast.LENGTH_SHORT).show();                         mPlay.prepare();
 
                           mPlay.start();                               
 
                        } catch (IOException e) {
 
                                        // TODO Auto-generated catch block
 
                                //      e.printStackTrace();
 
                                        Toast.makeText(getBaseContext(),"ERROR:"+ e.getMessage() , Toast.LENGTH_SHORT).show();
 
                                }
 
           }//end of onCheckedChanged method               
 
        }//End of OnCheckedChangedListener deceleration
 
       );//end of rdGroup.setOnCheckedChangedListener
 
       linLay.addView(rdGroup);
 
       //Add this Linear Layout to scroll view
 
       scrView.addView(linLay);      
 
       this.setContentView(scrView);      
 
    } //end of onCreate
 
Parsed in 0.048 seconds,  using GeSHi 1.0.8.4

MediaPlayer not Plyaing FileDescriptor problems

MediaPlayer not Plyaing FileDescriptor problems

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