Android Fragment不接受setcontentview [英] Android Fragment isn't accepting setcontentview
本文介绍了Android Fragment不接受setcontentview的处理方法，对大家解决问题具有一定的参考价值，需要的朋友们下面随着小编来一起学习吧！
问题描述
我正在尝试使用片段通过tablayouts(一个活动包含三个标签)制作滑动标签，我为树形标签制作了三个Java文件，并为以下教程制作了相应的xml文件，如下所示，它可以正常工作，我有三个标签.但我现在停留在如何对这些选项卡中的任何对象应用任何代码..它应该在选项卡java文件中吗?
I am trying to use fragments to make swiped tabs by tablayouts (one activity with three tabs), I made three Java files for the tree tabs and the corresponding xml files as the below tutorial and it is working and I had the three tabs. but I stuck now in how to apply any code for any object inside these tabs .. should it be in the tab java file?
如果是，则onCreateView方法不接受(findviewbyid)，我尝试添加onCreate方法，但不接受(setContentView)
if yes, the onCreateView method isn't accepting (findviewbyid) and I tried to add onCreate method but it is not accepting (setContentView)
我也尝试将代码添加到主活动类中，但是当我返回以下错误时:
I also tried to add the code in the main activity class but when I it returns the below error:
java.lang.NullPointerException: Attempt to invoke virtual method 'void android.widget.Button.setOnClickListener(android.view.View$OnClickListener)' on a null object reference
我应该在哪里设置对象并将代码应用于任何选项卡?
where should I set my objects and apply my code for any tab?
教程:
http://www.truiton.com/2015/06/android-tabs-example-fragments-viewpager/
编辑添加代码:
片段Java代码:
import android.app.DatePickerDialog;
import android.app.Dialog;
import android.os.Bundle;
import android.support.v4.app.Fragment;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.Button;
import android.widget.DatePicker;
import android.widget.TextView;
import android.widget.Toast;
import java.util.Calendar;
public class DCOGeneralReports extends Fragment {
private DatePicker datePicker;
private Calendar calendar;
private TextView EndDate;
private int year, month, day;
private Button DailyReportGenerate, CustomReportGenerate, StartDateSelect, EndDateSelect;
@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {
View view = inflater.inflate(R.layout.dco_general_report, container, false);
TextView StartDate = (TextView) view.findViewById(R.id.SDate);
return view;
}
片段XML代码:
<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="match_parent" android:layout_height="match_parent">
<TextView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:textAppearance="?android:attr/textAppearanceLarge"
android:text="Daily Report"
android:textColor="#1B5E20"
android:id="@+id/textView6"
android:layout_marginTop="27dp"
android:layout_alignParentTop="true"
android:layout_alignParentStart="true"
android:layout_marginStart="25dp" />
<TextView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:textAppearance="?android:attr/textAppearanceSmall"
android:text="Press Generate to get DCO Today Report"
android:id="@+id/textView9"
android:layout_below="@+id/textView6"
android:layout_marginTop="10dp"
android:layout_centerHorizontal="true" />
<Button
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="Generate"
android:textColor="#1B5E20"
android:id="@+id/DailyReport"
android:layout_below="@+id/textView9"
android:layout_centerHorizontal="true"
android:layout_marginTop="10dp" />
<TextView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:textAppearance="?android:attr/textAppearanceLarge"
android:text="Custom Report"
android:textColor="#1B5E20"
android:id="@+id/textView10"
android:layout_below="@+id/DailyReport"
android:layout_alignStart="@+id/textView6"
android:layout_marginTop="23dp" />
<TextView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:textAppearance="?android:attr/textAppearanceSmall"
android:text="Select Start And End Date Then Press Select"
android:id="@+id/textView11"
android:layout_below="@+id/textView10"
android:layout_centerHorizontal="true"
android:layout_marginTop="10dp" />
<TextView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:textAppearance="?android:attr/textAppearanceMedium"
android:text="Start Date: "
android:id="@+id/textView12"
android:layout_below="@+id/textView11"
android:layout_alignStart="@+id/textView10"
android:layout_marginTop="25dp" />
<TextView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:textAppearance="?android:attr/textAppearanceMedium"
android:text="End Date"
android:id="@+id/textView13"
android:layout_below="@+id/textView12"
android:layout_alignStart="@+id/textView12"
android:layout_marginTop="20dp" />
<TextView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:textAppearance="?android:attr/textAppearanceMedium"
android:text="SDate"
android:id="@+id/SDate"
android:layout_alignTop="@+id/textView12"
android:layout_toEndOf="@+id/textView6" />
<TextView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:textAppearance="?android:attr/textAppearanceMedium"
android:text="EDate"
android:id="@+id/EDate"
android:layout_centerVertical="true"
android:layout_below="@+id/textView12"
android:layout_marginStart="143dp"
android:layout_marginTop="20dp"/>
<Button
android:layout_width="75dp"
android:layout_height="40dp"
android:text="Select"
android:id="@+id/SelectStartDate"
android:layout_below="@+id/textView11"
android:layout_marginTop="16dp"
android:layout_toEndOf="@+id/DailyReport" />
<Button
android:layout_width="75dp"
android:layout_height="40dp"
android:text="Select"
android:id="@+id/SelectEndDate"
android:layout_below="@+id/SelectStartDate"
android:layout_alignStart="@+id/SelectStartDate" />
<Button
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="Generate"
android:textColor="#1B5E20"
android:id="@+id/CustomReport"
android:layout_marginTop="24dp"
android:layout_below="@+id/SelectEndDate"
android:layout_margin="10dp"
android:layout_centerHorizontal="true"
/>
</RelativeLayout>
推荐答案
您不能在Fragment中调用setContentView.您应该覆盖fragment的onCreatView方法，并按如下所示填充布局:
You can not call setContentView in Fragment. You should override the onCreatView method of fragment and inflate your layout as follows:
public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {
View v= inflater.inflate(R.layout.tab_fragment_2, container, false);
//to get view like textview, button etc use v.findViewById(yourid)
TextView textView = v.findViewById(R.id.textView2);
return v;
}
}.
这篇关于Android Fragment不接受setcontentview的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！
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