[英]Getting null object after passing it via Intent. My object class implements Parcelable interface.
活動1,從其中發送我的Parcelable對象:
Intent intent = new Intent(JobFieldAttribute.this, JobCamera.class);
intent.setFlags(Intent.FLAG_ACTIVITY_CLEAR_TOP);
Bundle mBundle = new Bundle();
mBundle.putParcelable("FieldData", fieldData);
mBundle.putSerializable("JobTransaction",jobTransaction);
mBundle.putString("imgPos", 0+"");
intent.putExtra("parce",mBundle);
startActivity(intent);
我的對象類:
public class FieldData implements Parcelable {
private Integer id;
private String value;
private Integer job_transaction_id;
private Integer field_attribute_master_id;
private Boolean required;
private View view;
private String viewType;
private String viewLabel;
private String viewSubLabel;
private String viewHelpText;
//All Getter setter methods
@Override
public int describeContents() {
return 0;
}
@Override
public void writeToParcel(Parcel dest, int flags) {
dest.writeInt(0);
dest.writeString(value);
try{
dest.writeInt(job_transaction_id);
}
catch(Exception e){dest.writeInt(0);}
dest.writeInt(field_attribute_master_id);
try{
dest.writeByte((byte) (required ? 1 : 0));
}
catch(Exception e){dest.writeByte((byte)0);}
try{
dest.writeString(viewType);
}
catch(Exception e){dest.writeString("NOVIEWTYPE");}
try{
dest.writeString(viewLabel);
}
catch(Exception e){dest.writeString("NO LABEL");}
try{
dest.writeString(viewSubLabel);
}
catch(Exception e){dest.writeString("NO SUB LABEL");}
try{
dest.writeString(viewHelpText);
}
catch(Exception e){dest.writeString("NO HELP TEXT");}
}
public static final Parcelable.Creator<FieldData> CREATOR = new Parcelable.Creator<FieldData>() {
@Override
public FieldData createFromParcel(Parcel in) {
FieldData fieldData = new FieldData();
fieldData.id = in.readInt();
Log.i("Pracel in", ">> " + in.readString());
fieldData.value = in.readString();
fieldData.job_transaction_id = in.readInt();
fieldData.field_attribute_master_id = in.readInt();
fieldData.required = in.readByte() != 0;
fieldData.viewType = in.readString();
fieldData.viewLabel = in.readString();
fieldData.viewSubLabel = in.readString();
fieldData.viewHelpText = in.readString();
return fieldData;
}
@Override
public FieldData[] newArray(int size) {
return new FieldData[size];
}
};
}
我的第二個活動,接收到這個Parcelable對象:
super.onCreate(savedInstanceState);
this.requestWindowFeature(Window.FEATURE_NO_TITLE);
this.setRequestedOrientation(ActivityInfo.SCREEN_ORIENTATION_PORTRAIT);
setContentView(R.layout.activity_job_camera);
FieldData fieldData = (FieldData) getIntent().getParcelableExtra("fieldData");
當我打印fieldData對象時,出現NullPointerException。 我不明白此錯誤的原因。 我究竟做錯了什么? 我是android開發的新手,並使用Parcelable接口通過Intent傳遞對象。 請幫忙。
您將Bundle
放到Intent
Extras中,而不是直接FieldData
。 因此,您的代碼應如下所示:
getIntent().getBundleExtra("parce").getParcelableExtra("fieldData");
您正在放置FieldData
但嘗試取回fieldData
。 結合@Dmitry Zaitsev的答案: getIntent().getBundleExtra("parce").getParcelableExtra("FieldData");
聲明:本站的技術帖子網頁,遵循CC BY-SA 4.0協議,如果您需要轉載,請注明本站網址或者原文地址。任何問題請咨詢:yoyou2525@163.com.