Android using jaudiotagger
I try to use jaudiotagger like this but it crashes
Main app.java : import java.io.File; import java.io.IOException;
import org.jaudiotagger.audio.AudioFile;
import org.jaudiotagger.audio.AudioFileIO;
import org.jaudiotagger.audio.AudioHeader;
import org.jaudiotagger.audio.exceptions.CannotReadException;
import org.jaudiotagger.audio.exceptions.CannotWriteException;
import org.jaudiotagger.audio.exceptions.InvalidAudioFrameException;
import org.jaudiotagger.audio.exceptions.ReadOnlyFileException;
import org.jaudiotagger.tag.FieldDataInvalidException;
import org.jaudiotagger.tag.FieldKey;
import org.jaudiotagger.tag.KeyNotFoundException;
import org.jaudiotagger.tag.Tag;
import org.jaudiotagger.tag.TagException;
import android.app.Activity;
import android.os.Bundle;
import android.widget.TextView;
import android.widget.Toast;
public class App extends Activity {
/** Called when the activity is first created. */
private TextView txt1;
private TextView txt2;
private TextView txt3;
private TextView txt4;
private TextView txt5;
private TextView txt6;
private TextView txt7;
private TextView txt8;
private TextView txt9;
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.main);
// try
//{
File mp3 = new File("/sdcard/test.mp3");
AudioFile f = null;
try {
f = AudioFileIO.read(mp3);
} catch (CannotReadException e) {
// TODO Auto-generated catch block
txt1.setText(e.toString());
} catch (IOException e) {
// TODO Auto-generated catch block
txt1.setText(e.toString());
} catch (TagException e) {
// TODO Auto-generated catch block
txt1.setText(e.toString());
} catch (ReadOnlyFileException e) {
// TODO Auto-generated catch block
txt1.setText(e.toString());
} catch (InvalidAudioFrameException e) {
// TODO Auto-generated catch block
txt1.setText(e.toString());
}
Tag tag = f.getTag();
AudioHeader AudioHeader = f.getAudioHeader();
txt1.setText(tag.getFirst(FieldKey.ARTIST));
txt2.setText(tag.getFirst(FieldKey.ALBUM));
txt3.setText(tag.getFirst(FieldKey.TITLE));
txt4.setText(tag.getFirst(FieldKey.COMMENT));
txt5.setText(tag.getFirst(FieldKey.YEAR));
txt6.setText(tag.getFirst(FieldKey.TRACK));
txt7.setText(tag.getFirst(FieldKey.DISC_NO));
txt8.setText(tag.getFirst(FieldKey.COMPOSER));
txt9.setText(tag.getFirst(FieldKey.ARTIST_SORT));
try {
tag.setField(FieldKey.ARTIST,"Kings of Leon");
} catch (KeyNotFoundException e) {
// TODO Auto-generated catch block
txt1.setText(e.toString());
} catch (FieldDataInvalidException e) {
// TODO Auto-generated catch block
txt1.setText(e.toString());
}
try {
AudioFileIO.write(f);
} catch (CannotWriteException e) {
txt1.setText(e.toString());
}
/* }
catch(Exception x)
{
txt1.setText(x.toString());
}
*/
}
}
Logcat :
02-22 21:12:22.546: E/AndroidRuntime(19738): FATAL EXCEPTION: main 02-22 21:12:22.546: E/AndroidRuntime(19738): java.lang.RuntimeException: Unable to start activity ComponentInfo{com.mp3.tag.editor.alexander.fuchs/com.mp3.tag.editor.alexander.fuchs.App}: java.lang.NullPointerException 02-22 21:12:22.546: E/AndroidRuntime(19738): at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:1651) 02-22 21:12:22.546: E/AndroidRuntime(19738): at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:1667) 02-22 21:12:22.546: E/AndroidRuntime(19738): at android.app.ActivityThread.access$1500(ActivityThread.java:117) 02-22 21:12:22.546: E/AndroidRuntime(19738): at android.app.ActivityThread$H.handleMessage(ActivityThread.java:935) 02-22 21:12:22.546: E/AndroidRuntime(19738): at android.os.Handler.dispatchMessage(Handler.java:99) 02-22 21:12:22.546: E/AndroidRuntime(19738): at android.os.Looper.loop(Looper.java:130) 02-22 21:12:22.546: E/AndroidRuntime(19738): at andro id.app.ActivityThread.main(ActivityThread.java:3691) 02-22 21:12:22.546: E/AndroidRuntime(19738): at java.lang.reflect.Method.invokeNative(Native Method) 02-22 21:12:22.546: E/AndroidRuntime(19738): at java.lang.reflect.Method.invoke(Method.java:507) 02-22 21:12:22.546: E/AndroidRuntime(19738): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:907) 02-22 21:12:22.546: E/AndroidRuntime(19738): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:665) 02-22 21:12:22.546: E/AndroidRuntime(19738): at dalvik.system.NativeStart.main(Native Method) 02-22 21:12:22.546: E/AndroidRuntime(19738): Caused by: java.lang.NullPointerException 02-22 21:12:22.546: E/AndroidRuntime(19738): at com.mp3.tag.editor.alexander.fuchs.App.onCreate(App.java:72) 02-22 21:12:22.546: E/AndroidRuntime(19738): at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1047) 02-22 21:12:22.546: E/AndroidRuntime(19738): at android.app.ActivityThread.performLaunchActivity(A ctivityThread.java:1615) 02-22 21:12:22.546: E/AndroidRuntime(19738): ... 11 more
Seems like this line causes the crash, because f is null:
Tag tag = f.getTag();
You shouldn't ignore the exception in the way you do, as if you got an exception, you just print something and continue with a bad state (in this case - f is still null)
There two blockers to using jaudiotagger on Android:
1 - javax.swing
2 - javax.imageio
these two Classes isn't supported by android and jaudiotagger uses them
To solve your problem: Fix the sources so they don't depend no more on these two JAVAX Classes
在获取标签之前，您仍然需要检查f！= null。
Tag r_tag = null;
File testFile = new File(filename);
MP3File f = null;
try {
f = (MP3File)AudioFileIO.read(testFile);
} catch (CannotReadException e) {
e.printStackTrace();
} catch (IOException e) {
e.printStackTrace();
} catch (TagException e) {
e.printStackTrace();
} catch (ReadOnlyFileException e) {
e.printStackTrace();
} catch (InvalidAudioFrameException e) {
e.printStackTrace();
}
if(f != null) {
f.getTagOrCreateAndSetDefault();
r_tag = f.getID3v2TagAsv24();
}
return r_tag;
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