我有这个课:
public class FlightData implements Parcelable {
private double x;
private double y;
private double time;
FlightData(double x, double y, double time){
this.x = x;
this.y = y;
this.time = time;
}
private FlightData(Parcel in) {
x = in.readDouble();
y = in.readDouble();
time = in.readDouble();
}
@Override
public int describeContents() {
return 0;
}
@Override
public void writeToParcel(Parcel dest, int flags) {
dest.writeDouble(x);
dest.writeDouble(y);
dest.writeDouble(time);
}
public static final Creator<FlightData> CREATOR = new Creator<FlightData>() {
@Override
public FlightData createFromParcel(Parcel in) {
return new FlightData(in);
}
@Override
public FlightData[] newArray(int size) {
return new FlightData[size];
}
};
...
}
我尝试将其打包,然后是意图。但是我什至无法在同一个活动中检索它(它在另一个活动中抛出null,所以我也尝试在当前活动中获取它-null):
List<FlightData> flightDataList = new ArrayList<>();
//... arraylist gets filled in
intent = new Intent(this, DatasheetActivity.class);
bundle = new Bundle();
bundle.putParcelableArrayList("FlightDataList", (ArrayList<? extends Parcelable>) flightDataList);
intent.putExtra("Bundle", bundle);
Log.d("ErrorCustom",Integer.toString(flightDataList.size()));
//Log.d("ErrorCustom",Integer.toString(intent.getExtras().getParcelableArrayList("FlightDataList").size())); //throws null error
startActivity(intent);
我确实要发送ArrayList,因为它被填充在当前活动中(带有进度条)。
最佳答案
仅出于意图使用putParcelableArrayListExtra
,不要使用Bundle。
尝试这个
Intent intent = new Intent(this, DatasheetActivity.class);
intent.putParcelableArrayListExtra("FlightDataList", flightDataList );
startActivity(intent);
在其他活动中
Intent intent = getIntent();
if (intent != null) {
List<FlightData> flightDataList;
flightDataList = intent.getParcelableArrayListExtra("FlightDataList");
}
关于java - 如何通过 Activity 发送ArrayList <CustomClass>(),我们在Stack Overflow上找到一个类似的问题:https://stackoverflow.com/questions/58283332/