标签：android nullpointerexception android-spinner
这是我的主要活动.我的微调器即使已经初始化也是null.每当访问任何布局元素时,我的应用程序都会崩溃
而对于我的生活,我无法弄清楚为什么.我花了很长时间在这上面,研究了许多在线帖子的解决方案,并尝试了一些修复.到目前为止,没有任何工作.有任何想法吗？
另外,忽略日期创建/排序代码.它非常混乱,我已经有了一个更简洁的方法,但是在我修复这个部分之前不会实现它.
注意：我的布局中的id都是正确的,我非常确定这不是问题所在.
公共类RADIO_Live扩展了FragmentActivity {
SectionsPagerAdapter mSectionsPagerAdapter;
ViewPager mViewPager;
View fragviewLive;
View fragviewPod;
private int mYear, mMonth, mDay, cYear, cMonth, cDay;
private TextView mCurrentDate;
private TextView mSelectedDate;
private TextView TextCurrentTime;
private TextView TextTotalTime;
boolean firstRUN = true;
SeekBar Podseekbar;
int myProgress = 0;
int podMax = 0;
int CurrentPosition = 0;
boolean playerPODon = false; // variable to keep track if live stream player and podcast player is on or off and if podacast player is paused
boolean playerPODon1st = true;
String mMonthName, cMonthName, cMonthFullName;
String podFileTest, podPlayName, SelectedHour, SelectedDate = null;
String showdate, HourShowText = null;
String[] podDates = new String[14];
String[] podDatesName = new String[14];
int testDay = 0;
int dayOfWeek;
private final Handler UIhandler = new Handler();
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.main);
// Create the adapter that will return a fragment for each of the three primary sections
// of the app.
mSectionsPagerAdapter = new SectionsPagerAdapter(getSupportFragmentManager());
//context.startService(serviceIntent);
startService(new Intent(this, RADIO_Service.class));
// Set up the ViewPager with the sections adapter.
mViewPager = (ViewPager) findViewById(R.id.pager);
mViewPager.setAdapter(mSectionsPagerAdapter);
fragviewPod = getLayoutInflater().inflate(R.layout.podcasts, null);
// Capture the textview elements
mCurrentDate = (TextView) fragviewPod.findViewById(R.id.currentdateDisplay);
mSelectedDate = (TextView) fragviewPod.findViewById(R.id.selecteddateDisplay);
TextTotalTime = (TextView) fragviewPod.findViewById(R.id.TotalTimeText);
TextCurrentTime = (TextView) fragviewPod.findViewById(R.id.CurrentTimeText);
// Retrieve the current date
Calendar c = Calendar.getInstance();
mYear = c.get(Calendar.YEAR);
mMonth = c.get(Calendar.MONTH);
mDay = c.get(Calendar.DAY_OF_MONTH);
IntentFilter filt = new IntentFilter("fromService");
RADIO_Live.this.registerReceiver(br, filt);
IntentFilter Podfilt = new IntentFilter("fromServicePod");
RADIO_Live.this.registerReceiver(PODbr, Podfilt);
actBroadcast("null", "whatsplaying");
ArrayList<CharSequence> dateadapterarray = new ArrayList<CharSequence>();
int ArrayMarker = 0;
for (int podtest = 1; podtest < 15; podtest++) {
MakeDateList(podtest);
if (dayOfWeek != (1|7)) {
podFileTest = cMonthName + " " + cDay + ", " + cYear;
podDatesName[ArrayMarker] = podFileTest;
String cYearTemp = cYear + "";
String cMonthTemp = cMonth + "";
if (cMonth >= 10) {
} else {
cMonthTemp = cMonthTemp.replace("0", "");
cMonthTemp = "0" + cMonthTemp;
}
if (cDay > 9) {
podDates[ArrayMarker] = (cMonthTemp + "" + cDay + "" + cYearTemp.replace("20", ""));
}
if (cDay <= 9) {
podDates[ArrayMarker] = (cMonthTemp + "" + "0" + cDay + "" + cYearTemp.replace("20", ""));
}
ArrayMarker++;
}
if (dayOfWeek == (1|7) && (ArrayMarker > 0)) {
ArrayMarker--;
}
}
for (int buildtext = 0; buildtext < 14; buildtext++) {
dateadapterarray.add(podDatesName[buildtext]);
}
fragviewPod = getLayoutInflater().inflate(R.layout.podcasts, null);
Spinner datespinner = (Spinner) fragviewPod.findViewById(R.id.spinnerdate);
Spinner hourspinner = (Spinner) fragviewPod.findViewById(R.id.spinnerhour);
//Spinner hourspinner = (Spinner) mViewPager.findViewById(R.id.spinnerhour);
ArrayAdapter<CharSequence> dateadapter = new ArrayAdapter<CharSequence>(RADIO_Live.this, android.R.layout.simple_spinner_item, dateadapterarray);
dateadapter.setDropDownViewResource(android.R.layout.simple_spinner_dropdown_item);
ArrayAdapter<CharSequence> houradapter = new ArrayAdapter<CharSequence>(RADIO_Live.this, android.R.layout.simple_spinner_item, R.array.hour_array);
houradapter.setDropDownViewResource(android.R.layout.simple_spinner_dropdown_item);
datespinner.setAdapter(dateadapter);
hourspinner.setAdapter(houradapter);
// Display the current date under "Today's Date" at the top
updateCurrentDate();
datespinner.setOnItemSelectedListener(new DateOnItemSelectedListener());
hourspinner.setOnItemSelectedListener(new HourOnItemSelectedListener());
Button livebutton = (Button) fragviewLive.findViewById(R.id.button_streamstartstop);
//livebutton.setOnClickListener((View.OnClickListener) this);
Button podplaybutton = (Button)fragviewPod.findViewById(R.id.button_pod_play);
//podplaybutton.setOnClickListener((View.OnClickListener) this);
}
更新：这是视图膨胀的地方.我试图将两个视图膨胀到他们自己的静态LinearLayouts中,但这也没有用.
所以在主要活动开始时：
static LinearLayout livelayout;
static LinearLayout podlayout;
然后是片段代码.它实际上是来自Android Studio的空默认应用程序的代码,其中包含以下内容：
public static class DummySectionFragment extends Fragment {
public DummySectionFragment() {
}
public static final String ARG_SECTION_NUMBER = "section_number";
@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
Bundle savedInstanceState) {
TextView textView = new TextView(getActivity());
textView.setGravity(Gravity.CENTER);
Bundle args = getArguments();
int test = args.getInt(ARG_SECTION_NUMBER);
livelayout = (LinearLayout)inflater.inflate(R.layout.live, null);
podlayout = (LinearLayout)inflater.inflate(R.layout.podcasts, null);
inflater.getContext().getSystemService(Context.LAYOUT_INFLATER_SERVICE);
int resID = 0;
switch (test) {
case 1:
resID = R.layout.live;
break;
case 2:
resID = R.layout.podcasts;
break;
}
//textView.setText(Integer.toString(args.getInt(ARG_SECTION_NUMBER)));
View fragview = inflater.inflate(resID, null);
return fragview;
}
}
因此,为了澄清,我有一个main.xml,它只是标题和页面适配器,然后是live.xml和podcast.xml.
main.xml中：
<android.support.v4.view.ViewPager
xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
android:id="@+id/pager"
android:layout_width="match_parent"
android:layout_height="match_parent"
tools:context=".RADIO_Live" >
<!--
This title strip will display the currently visible page title, as well as the page
titles for adjacent pages.
-->
<android.support.v4.view.PagerTitleStrip android:id="@+id/pager_title_strip"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_gravity="top"
android:background="#33b5e5"
android:textColor="#fff"
android:paddingTop="4dp"
android:paddingBottom="4dp" />
</android.support.v4.view.ViewPager>
Live.xml：
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:id="@+id/tab1"
android:layout_width="fill_parent"
android:layout_height="fill_parent"
android:background="#ffffff"
android:orientation="vertical" >
<LinearLayout android:id="@+id/tab1.1"
android:orientation="horizontal"
android:layout_width="fill_parent"
android:layout_height="wrap_content">
<TextView android:layout_width="fill_parent"
android:layout_height="wrap_content" android:layout_marginTop="15sp"
android:layout_marginBottom="10sp" android:layout_marginLeft="30sp"
android:layout_marginRight="30sp" android:textSize="18sp"
android:text="@string/LiveTabBlurb" />
</LinearLayout>
<Button android:id="@+id/button_streamstartstop"
android:layout_width="fill_parent" android:layout_height="wrap_content"
android:layout_marginTop="10sp" android:layout_marginLeft="20sp"
android:layout_marginRight="20sp" android:textSize="28sp"
android:textStyle="italic" android:textColor="#FFFFFF" android:text="@string/ListenLiveText" android:onClick="LiveButtonClick" />
<ProgressBar android:layout_gravity="center"
android:layout_height="100dp" android:layout_width="wrap_content"
android:id="@+id/liveProgress" android:paddingTop="30dp"
android:indeterminateBehavior="cycle" android:indeterminate="true"
android:visibility="gone">
</ProgressBar>
<ProgressBar
android:id="@+id/liveProgress"
style="?android:attr/progressBarStyleLarge"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:paddingTop="20dp"
android:visibility="gone" />
</LinearLayout>
Podcasts.xml：
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:id="@+id/tab2" android:orientation="vertical"
android:layout_width="fill_parent" android:layout_height="fill_parent"
android:background="#ffffff">
<LinearLayout android:orientation="horizontal" android:layout_width="wrap_content"
android:layout_height="wrap_content">
<LinearLayout android:orientation="vertical" android:layout_width="160dp"
android:layout_height="wrap_content">
<TextView android:id="@+id/currentdateDescription"
android:layout_width="wrap_content" android:layout_height="wrap_content"
android:paddingTop="5px" android:text="Today's Date:" />
<TextView android:id="@+id/currentdateDisplay"
android:layout_width="wrap_content" android:layout_height="wrap_content"
android:paddingBottom="5px" android:text="" />
</LinearLayout>
<LinearLayout android:orientation="vertical" android:layout_width="160dp"
android:layout_height="wrap_content">
<TextView android:id="@+id/selecteddateDescription"
android:layout_width="wrap_content" android:layout_height="wrap_content"
android:paddingTop="5px" android:text="Selected Date:" />
<TextView android:id="@+id/selecteddateDisplay"
android:layout_width="wrap_content" android:layout_height="wrap_content"
android:paddingBottom="5px" android:text="None Selected" />
</LinearLayout>
</LinearLayout>
<LinearLayout android:orientation="horizontal" android:layout_width="fill_parent"
android:layout_height="wrap_content">
<Spinner android:id="@+id/spinnerdate" android:layout_width="160dp"
android:layout_height="wrap_content" android:prompt="@string/date_prompt" />
<Spinner android:id="@+id/spinnerhour" android:layout_width="160dp"
android:layout_height="wrap_content" android:prompt="@string/hour_prompt" />
</LinearLayout>
<Button android:id="@+id/button_pod_play"
android:layout_width="fill_parent" android:layout_height="wrap_content"
android:layout_marginLeft="20sp" android:layout_marginRight="20sp"
android:paddingTop="5sp" android:layout_marginTop="10sp"
android:textSize="28sp" android:textColor="#FFFFFF" android:textStyle="italic"
android:text="@string/PlayPodText" android:onClick="PodButtonClick"/>
<SeekBar android:layout_width="fill_parent"
android:layout_height="wrap_content" android:paddingTop="5dp"
style="?android:attr/progressBarStyleHorizontal"
android:layout_margin="10dp" android:id="@+id/seekBar" android:max="100"
android:progress="0" />
<LinearLayout android:orientation="horizontal" android:layout_width="fill_parent"
android:layout_height="wrap_content">
<TextView android:id="@+id/CurrentTimeText"
android:layout_width="60dp" android:layout_height="wrap_content"
android:paddingTop="5px" android:textSize="18px" android:text="0:00" />
<ProgressBar android:layout_gravity="center"
android:layout_height="wrap_content" android:layout_width="fill_parent"
android:id="@+id/podProgress" android:paddingTop="10px"
android:indeterminateBehavior="cycle" android:indeterminate="true"
android:visibility="gone">
</ProgressBar>
<TextView android:id="@+id/TotalTimeText"
android:layout_width="fill_parent" android:layout_height="wrap_content"
android:paddingTop="5px" android:gravity="right" android:textSize="18px"
android:text="0:00" />
</LinearLayout>
</LinearLayout>
稍微多一点背景.这个应用程序实际上是100％工作,但我使用了一个丑陋的Android 2.0天标签界面,并希望更新与一个漂亮的Holo界面与页面视图适配器.在我尝试之前没有这样做过,我遇到了这些问题.
更新：我有一些工作(有点).调试时,我的两个微调器不再为null,至少根据调试器.但是,只要活动访问任何布局对象,应用程序仍然会崩溃.如果我尝试设置任何文本视图或微调器,它似乎崩溃,或者只是不更新内容.
片段代码：
public class SectionsPagerAdapter extends FragmentPagerAdapter {
public SectionsPagerAdapter(FragmentManager fm) {
super(fm);
}
@Override
public Fragment getItem(int i) {
//Fragment fragment = new DummySectionFragment();
Fragment fragment;
Bundle args = new Bundle();
switch(i){
case 0:
fragment = new fragLive();
args.putInt(fragLive.ARG_SECTION_NUMBER, i + 1);
break;
case 1:
fragment = new fragPod();
args.putInt(fragPod.ARG_SECTION_NUMBER, i + 1);
break;
default:
fragment = new fragLive();
args.putInt(fragLive.ARG_SECTION_NUMBER, i + 1);
break;
}
fragment.setArguments(args);
return fragment;
}
@Override
public int getCount() {
return 2;
}
@Override
public CharSequence getPageTitle(int position) {
switch (position) {
case 0: return getString(R.string.title_section1).toUpperCase();
case 1: return getString(R.string.title_section2).toUpperCase();
}
return null;
}
}
/**
* Two classes for the two layout fragments
*/
public class fragLive extends Fragment {
public fragLive() {
}
public static final String ARG_SECTION_NUMBER = "section_number";
@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
Bundle savedInstanceState) {
TextView textView = new TextView(getActivity());
textView.setGravity(Gravity.CENTER);
Bundle args = getArguments();
int test = args.getInt(ARG_SECTION_NUMBER);
inflater.getContext().getSystemService(Context.LAYOUT_INFLATER_SERVICE);
//textView.setText(Integer.toString(args.getInt(ARG_SECTION_NUMBER)));
fragviewLive = inflater.inflate(R.layout.live, null);
return fragviewLive;
}
}
public class fragPod extends Fragment {
public fragPod() {
}
public static final String ARG_SECTION_NUMBER = "section_number";
@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
Bundle savedInstanceState) {
TextView textView = new TextView(getActivity());
textView.setGravity(Gravity.CENTER);
Bundle args = getArguments();
int test = args.getInt(ARG_SECTION_NUMBER);
inflater.getContext().getSystemService(Context.LAYOUT_INFLATER_SERVICE);
//textView.setText(Integer.toString(args.getInt(ARG_SECTION_NUMBER)));
fragviewPod = inflater.inflate(R.layout.podcasts, null);
return fragviewPod;
}
}
解决方法:
首先检查main.xml布局中是否有R.id.spinnerdate.
如果是这种情况,请尝试以下方法：
由于您使用的是FragmentActivity,因此请先扩展您的布局.
private View myView;
.....
myView = getLayoutInflater().inflate(R.layout.main, null);
并将datespinner引用更改为：
Spinner datespinner = (Spinner) myView.findViewById(R.id.spinnerdate);
标签：android,nullpointerexception,android-spinner 来源： https://codeday.me/bug/20190529/1176842.html
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