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我正在尝试将一组自定义对象传递给一个活动。我已经实现了 parcelable ：

public class WidgetState {

    static class Light implements Parcelable
    {
        int id;
        String text;
        int offColor,onColor;
        boolean on=false;

        boolean isRows;
        int size;

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

        public Light[] newArray(int size) {
            return new Light[size];
        }
    };
        @Override
        public int describeContents() {
            return 0;
        }

        public Light(Parcel src)
        {
            id = src.readInt();
            text = src.readString();
            offColor = src.readInt();
            onColor = src.readInt();
            on = src.readInt()==1;
            isRows = src.readInt()==1;
            size = src.readInt();
        }

        public Light() { }

        @Override
        public void writeToParcel(Parcel dest, int flags) {
            dest.writeInt(id);
            dest.writeString(text);
            dest.writeInt(offColor);
            dest.writeInt(onColor);
            dest.writeInt(on?1:0);
            dest.writeInt(isRows?1:0);
            dest.writeInt(size);            
        }       
    }
}

我可以在启动活动中将单个对象放入捆绑包中并通过以下方式检索它

bundle.putParcelable(new WidgetState.Light(),"light");

并通过以下方式在结果活动中检索它

WidgetState.Light light = (WidgetState.Light)getIntent().getExtras().getParcelable("light")

但是当像这样打包和排列时

bundle.putParcelableArray(new WidgetState.Light[4],"lights");

我可以在第一个活动中做到这一点

WidgetState.Light[] lights = (WidgetState.Light[])bundle.getParcelableArray("lights");
intent.putExtras(bundle);
startActivityForResult(intent,1);

但是在第二个活动中，当我调用时我得到了一个 RuntimeException

WidgetState.Light [] lights = (WidgetState.Light []) state.getParcelableArray("lights");

这是第一个活动中的所有代码

Intent intent = new Intent(MainActivity.this,GuiActivity.class);

Bundle bundle = new Bundle();
bundle.putParcelable("light", new WidgetState.Light());
bundle.putParcelableArray("lights", new WidgetState.Light[4]);                  

WidgetState.Light[]lights = (WidgetState.Light[])bundle.getParcelableArray("lights");

intent.putExtras(bundle);

startActivityForResult(intent,1);

而第二个

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

    Bundle state = (savedInstanceState!=null)?savedInstanceState:getIntent().getExtras();

    try {
        WidgetState.Light light = (WidgetState.Light) state.getParcelable("light");
        // Throws RuntimeException on next line
        WidgetState.Light [] lights = (WidgetState.Light []) state.getParcelableArray("lights");

        Toast.makeText(this, "Good bundle", Toast.LENGTH_SHORT).show();

    }
    catch ( RuntimeException e)
    {
        Toast.makeText(this, "Failed to read bundle", Toast.LENGTH_SHORT).show();
    }
}

我错过了什么？

4

0 回答 0