Question

代码

SngList.setOnItemClickListener(new OnItemClickListener() {
    public void onItemClick(AdapterView a, View v, int position, long id) {


        Intent intent = new Intent(getActivity(), NowPlaying.class);
        intent.putExtra("Data1",Songinfo);
        intent.putExtra("Data2",position);
        startActivity(intent);

    }
});

接收类中的代码

Intent i = getIntent();
ArrayList<SongDetails> Songinfo2 = (ArrayList<SongDetails>)i.getSerializableExtra("Data1"); 
position=i.getIntExtra("Data2", 1);

songDetials的代码

package sourcecode.jazzplayer;

import java.io.Serializable;

import android.graphics.Bitmap;

public class SongDetails implements Serializable{
    Bitmap icon ;
    String song;
    String Artist; 
    String Album;
    String Path;
   int icLauncher;

    public String getSong() {
        return song;
    }

    public void setSong(String song) {
        this.song = song;
    }

    public String getArtist() {
        return Artist;
    }

    public void setArtist(String Artist) {
        this.Artist = Artist;
    }

    public Bitmap getIcon() {
        return icon;
    }

    public void setIcon(Bitmap bitmap) {
        this.icon = bitmap;
    }

    public String getPath2() {
        return Path;
    }

    public void setPath2(String Path) {
        this.Path = Path;
    }

    public String getAlbum() {
        return Album;
    }

    public void setAlbum(String Album) {
        this.Album = Album;
    }

    public void setIcon(int icLauncher) {
        this.icLauncher = icLauncher;
    }
}

整个代码：

public class FragmentSongs extends  Fragment implements Serializable {
    AdapterView.AdapterContextMenuInfo info;

    @Override
    public View onCreateView(LayoutInflater inflater, ViewGroup container,
        Bundle savedInstanceState) 
    {

        View view = inflater.inflate(R.layout.fragment_song, container, false);
        ListView SngList = (ListView) view.findViewById(R.id.SongList);
        registerForContextMenu(SngList);
        File f=new File("/system/");
        //File f=new File("/sdcard/Music");
        int j=0;int i=0;



         final ArrayList<SongDetails> Songinfo = getSongsFromDirectory(f);

        if (Songinfo.size()>0)
        {

            for( j=0; j<Songinfo.size();j++)
            {
                for ( i=j+1 ; i<Songinfo.size(); i++)
                { 
                    SongDetails a=Songinfo.get(i);
                    SongDetails b=Songinfo.get(j);
                    if(a.getSong().toLowerCase().compareTo(b.getSong().toLowerCase())<0)
                    {   

                        Songinfo.set(i,b );
                        Songinfo.set(j,a);
                    }
                }

            }

            SngList.setOnItemClickListener(new OnItemClickListener() {
                 public void onItemClick(AdapterView a, View v, int position, long id) {


                       Intent intent = new Intent(getActivity(), NowPlaying.class);
                       intent.putExtra("Data1",Songinfo);
                       intent.putExtra("Data2",position);
                       startActivity(intent);

                             }
                     });

           SngList.setAdapter(new CustomAdapter(Songinfo));
           return view;
        }
        else return null;

    }



        public ArrayList<SongDetails> getSongsFromDirectory(File f)
        {MediaMetadataRetriever mmr = new MediaMetadataRetriever();
            ArrayList<SongDetails> songs = new ArrayList<SongDetails>();
            Bitmap bitmap2; 
            Bitmap bmp = BitmapFactory.decodeResource(getResources(), R.drawable.ab);

            float ht_px = TypedValue.applyDimension(TypedValue.COMPLEX_UNIT_DIP, 100, getResources().getDisplayMetrics());
            float wt_px = TypedValue.applyDimension(TypedValue.COMPLEX_UNIT_DIP, 100, getResources().getDisplayMetrics());

            bitmap2 = Bitmap.createScaledBitmap(bmp, (int) ht_px, (int) wt_px, true);



           byte[] rawArt = null;
            Bitmap art;
            BitmapFactory.Options bfo=new BitmapFactory.Options();
            if (!f.exists() || !f.isDirectory()) 

            {    
                return songs;
            }
            File[] files = f.listFiles(new Mp3Filter());
            for(int i=0; i<files.length; i++) 
            { 

                if (files[i].isFile())
                { 


                 //mmr.setDataSource(files[i].getPath());
                // rawArt = mmr.getEmbeddedPicture();
                    SongDetails detail=new SongDetails(); 
                //if ( rawArt != null) 

                //{ 
                    //bitmap2=BitmapFactory.decodeByteArray(rawArt, 0, rawArt.length, bfo);
                    //bitmap2 = Bitmap.createScaledBitmap(bitmap2, (int) ht_px, (int) wt_px, true);

                    //detail.setIcon(bitmap2);
                //}//else 
            //{     
                    detail.setIcon(bitmap2);
                //} 

                    detail.setSong(files[i].getName()); 
          // detail.setArtist(files[i].getName());
          // detail.setAlbum(files[i].getName());

             //detail.setArtist(mmr.extractMetadata(MediaMetadataRetriever.METADATA_KEY_ARTIST)); 

          // detail.setAlbum(mmr.extractMetadata(MediaMetadataRetriever.METADATA_KEY_ALBUM)); 
           detail.setPath2( files[i].getPath()) ;
           songs.add(detail); 
                }
                else if (files[i].isDirectory())
                { 
                songs.addAll(getSongsFromDirectory(files[i])); 
                } 

            }       return songs;
    }
        @Override
        public void onCreateContextMenu(ContextMenu menu, View v, ContextMenuInfo menuInfo) 
        {
                        super.onCreateContextMenu(menu, v, menuInfo);      
                       info = (AdapterContextMenuInfo) menuInfo;
                       menu.add(Menu.NONE, v.getId(), 0, "Play");
                       menu.add(Menu.NONE, v.getId(), 0, "Delete");
                       menu.add(Menu.NONE, v.getId(), 0, "Queue Item");                  
               }

        @Override
        public boolean onContextItemSelected(MenuItem item) {
                if (item.getTitle() == "Play") {

                       }
                 else if (item.getTitle() == "Delete") {

                       }

                 else if (item.getTitle() == "Queue Item") {

                       }
                 else     {
                       return false;
                       }
               return true;
               }}


        class Mp3Filter implements FileFilter
        {
            public boolean accept(File file)
            {
            return (file.isDirectory()||file.getName().endsWith(".apk")|| file.getName().endsWith(".Mp3"));
            }
        }

日志

java.lang.RuntimeException：Parcelable遇到IOException写入可序列化对象（name = sourcecode.jazzplayer.SongDetails）

Answer 1

好的，我为你实现了部分内容。您必须添加SongDetails类的所有其他属性：

<强> MainActivity.java：

@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_main);

    SongDetails Songinfo1 = new SongDetails();
    Songinfo1.setSong("song1");

    SongDetails Songinfo2 = new SongDetails();
    Songinfo2.setSong("song2");

    ArrayList<SongDetails> list = new ArrayList<SongDetails>();
    list.add(Songinfo1);
    list.add(Songinfo2);

    Intent intent = new Intent(this, SecondActivity.class);
    intent.putParcelableArrayListExtra("Data1", list);
    intent.putExtra("Data2", 1);
    startActivity(intent);

}

在您要检索歌曲的活动中，请使用：

@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_asdf);

    ArrayList<SongDetails> songs = getIntent().getParcelableArrayListExtra("Data1");

    for(SongDetails songDetails : songs) {
        Log.i("", songDetails.getSong());
    }
}

您的SongDetails类应如下所示：

<强> SongDetails：

public class SongDetails implements Parcelable {
    Bitmap icon;
    String song;
    String Artist;
    String Album;
    String Path;
    int icLauncher;

    public SongDetails() {
    }

    public SongDetails(Parcel in) {
        String[] data = new String[1];
        in.readStringArray(data);
        this.song = data[0];
    }

    public String getSong() {
        return song;
    }

    public void setSong(String song) {
        this.song = song;
    }

    public String getArtist() {
        return Artist;
    }

    public void setArtist(String Artist) {
        this.Artist = Artist;
    }

    public Bitmap getIcon() {
        return icon;
    }

    public void setIcon(Bitmap bitmap) {
        this.icon = bitmap;
    }

    public String getPath2() {
        return Path;
    }

    public void setPath2(String Path) {
        this.Path = Path;
    }

    public String getAlbum() {
        return Album;
    }

    public void setAlbum(String Album) {
        this.Album = Album;
    }

    public void setIcon(int icLauncher) {
        this.icLauncher = icLauncher;
    }

    @Override
    public int describeContents() {
        return 0;
    }

    @Override
    public void writeToParcel(Parcel dest, int flags) {
        dest.writeStringArray(new String[] { this.song });
    }

    public static final Parcelable.Creator CREATOR = new Parcelable.Creator() {
        public SongDetails createFromParcel(Parcel in) {
            return new SongDetails(in);
        }

        public SongDetails[] newArray(int size) {
            return new SongDetails[size];
        }
    };
}

Answer 2

根据https://forums.bignerdranch.com/t/challenge-saving-state-notserializableexception-error/8018/5，您应该从Parcelable实施或扩展某些课程。在我的例子中，我有一个DialogFragment，其接口MyCallback扩展了Serializable。在我使用的newInstance(MyCallback callback)构建器中：

Bundle args = new Bundle();
args.putSerializable(key, callback);

导致异常。然后我重写了MyCallback以扩展Parcelable，并在调用此DialogFragment时向回调添加了一些方法。至少，它不会在主页按钮或屏幕关闭时崩溃。

也改为：

Bundle args = new Bundle();
args.putParcelable(key, callback);

Answer 3

我知道你的问题在哪里，那是关于 BitMap 你需要做的就是在发送到intent

之前解码你的BitMap

Bitmap largeIcon = BitmapFactory.decodeResource(getResources(), R.drawable.thumbsup);
        ByteArrayOutputStream stream = new ByteArrayOutputStream();
        largeIcon.compress(Bitmap.CompressFormat.JPEG, 100, stream);
        byte[] byteArray = stream.toByteArray();

然后在意图中发送以下对象

intent.putExtras("remindermessage",object);

如果没有关于Bitmap，那么你应该寻找其他可能占用更多空间并在发送到intent之前解码它们的东西

Answer 4

在我的案例中，实际的类Order（实现中有一个嵌套的Delivery类未序列化），而Delivery类也实现了Serializable后，该异常消失了。我根本不需要实现parcelable。希望这对某人有帮助！

Answer 5

从其他活动中获取arraylist。

      ArrayList<SongDetails> list = new ArrayList<SongDetails>();
              list=  getIntent().getStringArrayListExtra("Data1");

将arraylist传递给另一个活动。

intent.putStringArrayListExtra("Data1", Songinfo);

拆分数组列表：

        for(SongDetails name: list)
        {
        String yoursong= name.song;
        }

希望这会给你一些解决方案。

parcelable遇到ioexception编写可序列化对象.........？

5 个答案: