传递ArrayList <？实现Parcelable> to Activity

Question

我搜索了一些主题,但没有找到解决我问题的方法.

public class Series implements Parcelable {
private String name;
private int numOfSeason;
private int numOfEpisode;

/** Constructors and Getters/Setters have been removed to make reading easier **/

public Series(Parcel in) {
    String[] data = new String[3];
    in.readStringArray(data);
    this.name = data[0];
    this.numOfSeason = Integer.parseInt(data[1]);
    this.numOfEpisode = Integer.parseInt(data[2]);
}


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

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

}

private void readFromParcel(Parcel in) {
    name = in.readString();
    numOfSeason = in.readInt();
    numOfEpisode = in.readInt();
}

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

    @Override
    public Series[] newArray(int size) {
        return new Series[size];
    }
};

}

在我的MainActivity中,我有一个ArrayList.为了使列表动态可编辑,我需要将它传递给另一个我可以编辑它的活动.

ArrayList<Series> listOfSeries = new ArrayList<Series>();

    public void openAddActivity() {
    Intent intent = new Intent(this, AddActivity.class);
    intent.putParcelableArrayListExtra(
            "com.example.episodetracker.listofseries",
            (ArrayList<? extends Parcelable>) listOfSeries);
    startActivity(intent);
}

我需要转换列表,否则Eclipse会给我以下错误消息. 方法类型为putParcelableArrayListExtra(String,ArrayList)的方法不适用于参数(String,List)

这是正确的方法吗？

    ArrayList<Series> list = savedInstanceState
            .getParcelableArrayList("com.example.episodetracker.listofseries");

这是我尝试读取另一个活动中的数据的方式.

它在上面的线上崩溃了.即getParcelableArrayList部分.

Answer 1

• 问题在于写到包裹并从包裹中读入...

  @Override
  public void writeToParcel(Parcel dest, int flags) {
      dest.writeString(name);
      dest.writeInt(numOfSeason);
      dest.writeInt(numOfEpisode);
  }
  
  private void readFromParcel(Parcel in) {
      name = in.readString();
      numOfSeason = in.readInt();
      numOfEpisode = in.readInt();
  }
  

• 你写的东西必须与你读的内容相符......

  @Override
   protected void onCreate(Bundle savedInstanceState) {
  super.onCreate(savedInstanceState);
  setContentView(R.layout.activity_main);
  
  Intent i = new Intent(this,SecondActivity.class);
  
  ArrayList<testparcel> testing = new ArrayList<testparcel>();
  
  i.putParcelableArrayListExtra("extraextra", testing);
  startActivity(i);
  }
  
      /**********************************************/
  
  
  public class SecondActivity extends Activity {
  @Override
  protected void onCreate(Bundle savedInstanceState) {
      super.onCreate(savedInstanceState);
      setContentView(R.layout.activity_main);
  
      ArrayList<testparcel> testing = this.getIntent().getParcelableArrayListExtra("extraextra");
   }
  }
  

• 上面的代码是来自两个不同活动的onCreate().第一个发射第二个; 它工作正常我能够毫无问题地拉出parcelable.