Android MediaPlayer-Fehler (-38, 0) "Stopp im Status 0 aufgerufen"

Question

Jul 18, 2013, 03:35 PM

Android MediaPlayer-Fehler (-38, 0) "Stopp im Status 0 aufgerufen"

Ich habe auf verschiedenen Websites nach einer Lösung für dieses Problem in meinem Code gesucht. Es ist ein grundlegender Audioplayer mit 3 Tasten: Wiedergabe, Pause und Stopp. Wiedergabe und Pause funktionieren einwandfrei und hören auch auf, aber wenn der Ton einmal gestoppt wurde, wird er nicht mehr gestartet, und es wird ein Fehler ausgegeben:

E/MediaPlayer: stop called in state 0
E/MediaPlayer: error (-38, 0)
E/MediaPlayer: Error (-38,0)

Dies ist meine MainActivity.java:

import android.app.Activity;
import android.media.MediaPlayer;
import android.net.Uri;
import android.os.Bundle;
import android.os.Handler;
import android.view.Menu;
import android.view.View;
import android.widget.Button;
import android.widget.SeekBar;

import java.io.IOException;

public class MainActivity extends Activity implements MediaPlayer.OnPreparedListener {

    static Button playButton;
    static Button pauseButton;
    static Button stopButton;
    static SeekBar seekBar;
    private static MediaPlayer player;
static Handler handler;
static Uri audio;

@Override
protected void onCreate(Bundle savedInstanceState) {
    player = MediaPlayer.create(this, R.raw.airbourne_runnin_wild);
    Uri audio = Uri.parse("android.resource://" + getPackageName() + "/" + R.raw.airbourne_runnin_wild);
    try {
        player.setDataSource(getAssets().openFd("raw/airbourne_runnin_wild.mp3").getFileDescriptor());
    } catch (IOException e) {
        e.printStackTrace();
    }
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_main);

    playButton = (Button) findViewById(R.id.playButton);
    pauseButton = (Button) findViewById(R.id.pauseButton);
    stopButton = (Button) findViewById(R.id.stopButton);
    seekBar = (SeekBar) findViewById(R.id.seekBar);

    player.setOnPreparedListener(this);

    handler = new Handler();

    seekBar.setMax(player.getDuration());

    playButton.setOnClickListener(new View.OnClickListener() {
        public void onClick(View view) {
            if (!player.isPlaying()) {
                try {
                    player.setDataSource(getAssets().openFd("raw/airbourne_runnin_wild.mp3").getFileDescriptor());
                } catch (IOException e) {
                    e.printStackTrace();
                }
                player.start();
                updateSeekBar();
            }
        }
    });

    pauseButton.setOnClickListener(new View.OnClickListener() {
        public void onClick(View view) {
            if (player.isPlaying()) {
                player.pause();
            }
        }
    });

    stopButton.setOnClickListener(new View.OnClickListener() {
        public void onClick(View view) {
            if (player.isPlaying()) {
                player.stop();
                seekBar.setProgress(0);
                seekBar.invalidate();
                try {
                    player.setDataSource(getAssets().openFd("raw/airbourne_runnin_wild.mp3").getFileDescriptor());
                } catch (IOException e) {
                    e.printStackTrace();
                }
            }
        }
    });

    seekBar.setOnSeekBarChangeListener(new SeekBar.OnSeekBarChangeListener() {
        @Override
        public void onProgressChanged(SeekBar seekBar, int i, boolean b) {
            if (b) {
                seekChanged(seekBar, i, b);
            }
        }

        @Override
        public void onStartTrackingTouch(SeekBar seekBar) {

        }

        @Override
        public void onStopTrackingTouch(SeekBar seekBar) {

        }
    });

    player.setOnCompletionListener(new MediaPlayer.OnCompletionListener() {
        @Override
        public void onCompletion(MediaPlayer mediaPlayer) {
            player.stop();
            seekBar.setProgress(0);
            //player.prepareAsync();
            seekBar.invalidate();
        }
    });
}


@Override
public boolean onCreateOptionsMenu(Menu menu) {
    // Inflate the menu; this adds items to the action bar if it is present.
    getMenuInflater().inflate(R.menu.main, menu);
    return true;
}

@Override
public void onPrepared(MediaPlayer mediaPlayer) {
    playButton.setEnabled(true);
}

public void seekChanged(SeekBar seekBar, int progress, boolean fromUser) {
    player.seekTo(progress);
}

public void updateSeekBar() {
    seekBar.setProgress(player.getCurrentPosition());

    if (player.isPlaying()) {
        Runnable notification = new Runnable() {
            public void run() {
                updateSeekBar();
            }
        };
        handler.postDelayed(notification, 1500);
    }
}
}

Und activity_main.xml:

<TableLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:paddingLeft="@dimen/activity_horizontal_margin"
android:paddingRight="@dimen/activity_horizontal_margin"
android:paddingTop="@dimen/activity_vertical_margin"
android:paddingBottom="@dimen/activity_vertical_margin"
tools:context=".MainActivity">

<TableRow
        android:layout_width="fill_parent"
        android:layout_height="fill_parent">

    <Button
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:text="Play"
            android:id="@+id/playButton"
            android:layout_gravity="center_horizontal|top"
            android:longClickable="false"
            android:layout_weight="1"
            android:layout_column="8"
            android:enabled="false"/>
</TableRow>

<TableRow
        android:layout_width="fill_parent"
        android:layout_height="fill_parent">

    <Button
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:text="Pause"
            android:id="@+id/pauseButton"
            android:layout_gravity="center_horizontal|top"
            android:layout_weight="1"
            android:layout_column="8"
            android:layout_span="7"/>
</TableRow>

<TableRow
        android:layout_width="fill_parent"
        android:layout_height="fill_parent">

    <Button
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:text="Stop"
            android:id="@+id/stopButton"
            android:layout_column="8"
            android:layout_span="24"
            android:layout_weight="1"/>
</TableRow>

<TableRow
        android:layout_width="fill_parent"
        android:layout_height="fill_parent">
</TableRow>

<TableRow
        android:layout_width="fill_parent"
        android:layout_height="fill_parent">

    <SeekBar
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:id="@+id/seekBar"
            android:layout_column="8"
            android:layout_span="24"
            android:layout_weight="1"/>
</TableRow>

Wenn jemand mir helfen könnte, diesen Fehler zu beheben, wäre er sehr dankbar. Ich habe bereits nach Lösungen gesucht und mehrere ausprobiert, aber keine schien richtig zu funktionieren.

EDIT: Ich habe den Code ein wenig geändert:

Meine Frage bezieht sich immer noch auf den Fehler, und dies ist jetzt mein bearbeiteter Code:

import android.app.Activity;
import android.media.MediaPlayer;
import android.net.Uri;
import android.os.Bundle;
import android.os.Handler;
import android.view.Menu;
import android.view.View;
import android.widget.Button;
import android.widget.SeekBar;

import java.io.IOException;

public class MainActivity extends Activity implements MediaPlayer.OnPreparedListener {

static Button playButton;
static Button pauseButton;
static Button stopButton;
static SeekBar seekBar;
private static MediaPlayer player;
static Handler handler;
static Uri audio;
static boolean canMakeCall = false;

@Override
protected void onCreate(Bundle savedInstanceState) {
    player = MediaPlayer.create(this, R.raw.airbourne_runnin_wild);
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_main);

    playButton = (Button) findViewById(R.id.playButton);
    pauseButton = (Button) findViewById(R.id.pauseButton);
    stopButton = (Button) findViewById(R.id.stopButton);
    seekBar = (SeekBar) findViewById(R.id.seekBar);

    if (canMakeCall = true) {
        player.setOnPreparedListener(this);

        handler = new Handler();

        seekBar.setMax(player.getDuration());

        playButton.setOnClickListener(new View.OnClickListener() {
            public void onClick(View view) {
                if (!player.isPlaying()) {
                    player.start();
                    updateSeekBar();
                }
            }
        });

        pauseButton.setOnClickListener(new View.OnClickListener() {
            public void onClick(View view) {
                if (player.isPlaying()) {
                    player.pause();
                }
            }
        });

        stopButton.setOnClickListener(new View.OnClickListener() {
            public void onClick(View view) {
                if (player.isPlaying()) {
                    player.stop();
                    seekBar.setProgress(0);
                    seekBar.invalidate();
                    try {
                        player.prepare();
                    } catch (IOException e) {
                        e.printStackTrace();
                    }
                }
            }
        });

        seekBar.setOnSeekBarChangeListener(new SeekBar.OnSeekBarChangeListener() {
            @Override
            public void onProgressChanged(SeekBar seekBar, int i, boolean b) {
                if (b) {
                    seekChanged(seekBar, i, b);
                }
            }

            @Override
            public void onStartTrackingTouch(SeekBar seekBar) {

            }

            @Override
            public void onStopTrackingTouch(SeekBar seekBar) {

            }
        });

        player.setOnCompletionListener(new MediaPlayer.OnCompletionListener() {
            @Override
            public void onCompletion(MediaPlayer mediaPlayer) {
                mediaPlayer.stop();
                //player.stop();

                seekBar.setProgress(0);
                //player.prepareAsync();
                seekBar.invalidate();
            }
        });
    }
}


@Override
public boolean onCreateOptionsMenu(Menu menu) {
    // Inflate the menu; this adds items to the action bar if it is present.
    getMenuInflater().inflate(R.menu.main, menu);
    return true;
}

@Override
public void onPrepared(MediaPlayer mediaPlayer) {
    playButton.setEnabled(true);
    canMakeCall = true;
}

public void seekChanged(SeekBar seekBar, int progress, boolean fromUser) {
    player.seekTo(progress);
}

public void updateSeekBar() {
    seekBar.setProgress(player.getCurrentPosition());

    if (player.isPlaying()) {
        Runnable notification = new Runnable() {
            public void run() {
                updateSeekBar();
            }
        };
        handler.postDelayed(notification, 1500);
    }
}
}

Ich habe versucht, die Grundlagen auch ohne Suchleiste zum Laufen zu bringen, nur um sicherzustellen, dass dies keinen Fehler verursacht, sondern irgendwo in der Logik des Wiedergabe- / Pause- / Stopp-Codes liegt, da er selbst mit dem Suchleistencode den gleichen Fehler verursachte weggelassen.