Android的微调NullPointException [英] Android Spinner NullPointException
本文介绍了Android的微调NullPointException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
我发现一个错误,当我创建一个微调。看来,微调是空的,但我不知道哪里出了问题。我有创造的strings.xml的字符串数组。是否有我错过任何东西?
code:
公共类NewWorkOrder扩展ActionBarActivity { 私人微调微调; @覆盖
保护无效的onCreate(捆绑savedInstanceState){
super.onCreate(savedInstanceState);
的setContentView(R.layout.activity_new_work_order); this.spinner =(微调)findViewById(R.id.workTypeSpinner);
//使用字符串数组和默认微调布局的ArrayAdapter
ArrayAdapter<串GT;适配器=新ArrayAdapter<串GT;(这一点,
R.array.work_type,android.R.layout.simple_spinner_item);
//指定布局使用出现的选项列表时,
adapter.setDropDownViewResource(android.R.layout.simple_spinner_dropdown_item);
//应用适配器微调
spinner.setAdapter(适配器); 如果(savedInstanceState == NULL){
getSupportFragmentManager()调用BeginTransaction()
。新增(R.id.container,新PlaceholderFragment())提交()。 } }
@覆盖
公共布尔onCreateOptionsMenu(菜单菜单){ //充气菜单;如果是present这增加了项目操作栏。
。getMenuInflater()膨胀(R.menu.new_work_order,菜单);
返回true;
} @覆盖
公共布尔onOptionsItemSelected(菜单项项){
//处理动作栏项目点击这里。操作栏会
//自动处理上点击主页/向上按钮,只要
//你在AndroidManifest.xml中指定一个父活动。
INT ID = item.getItemId();
如果(ID == R.id.action_settings){
返回true;
}
返回super.onOptionsItemSelected(项目);
} / **
*包含一个简单视图中的占位符片段。
* /
公共静态类PlaceholderFragment扩展片段{ 公共PlaceholderFragment(){
} @覆盖
公共查看onCreateView(LayoutInflater充气器,容器的ViewGroup,
捆绑savedInstanceState){
查看rootView = inflater.inflate(R.layout.fragment_new_work_order,
集装箱,FALSE);
返回rootView;
}
}}
LogCat中
3月6日至11日:02:30.174:E / AndroidRuntime(1389):致命异常:主要
3月六日至11日:02:30.174:E / AndroidRuntime(1389):了java.lang.RuntimeException:无法启动活动ComponentInfo {com.cosmic.workorder / com.cosmic.workorder.NewWorkOrder}:java.lang.IllegalArgumentException异常:无鉴于发现ID 0x7f05003c(com.cosmic.workorder:ID /容器)的片段PlaceholderFragment {41735b50#0 ID = 0x7f05003c}
3月六日至11日:02:30.174:E / AndroidRuntime(1389):在android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2211)
3月六日至11日:02:30.174:E / AndroidRuntime(1389):在android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2261)
3月六日至11日:02:30.174:E / AndroidRuntime(1389):在android.app.ActivityThread.access $ 600(ActivityThread.java:141)
3月六日至11日:02:30.174:E / AndroidRuntime(1389):在android.app.ActivityThread $ H.handleMessage(ActivityThread.java:1256)
3月六日至11日:02:30.174:E / AndroidRuntime(1389):在android.os.Handler.dispatchMessage(Handler.java:99)
3月六日至11日:02:30.174:E / AndroidRuntime(1389):在android.os.Looper.loop(Looper.java:137)
3月六日至11日:02:30.174:E / AndroidRuntime(1389):在android.app.ActivityThread.main(ActivityThread.java:5103)
3月六日至11日:02:30.174:E / AndroidRuntime(1389):在java.lang.reflect.Method.invokeNative(本机方法)
3月六日至11日:02:30.174:E / AndroidRuntime(1389):在java.lang.reflect.Method.invoke(Method.java:525)
3月六日至11日:02:30.174:E / AndroidRuntime(1389):在com.android.internal.os.ZygoteInit $ MethodAndArgsCaller.run(ZygoteInit.java:737)
3月六日至11日:02:30.174:E / AndroidRuntime(1389):在com.android.internal.os.ZygoteInit.main(ZygoteInit.java:553)
3月六日至11日:02:30.174:E / AndroidRuntime(1389):在dalvik.system.NativeStart.main(本机方法)
3月六日至11日:02:30.174:E / AndroidRuntime(1389):java.lang.IllegalArgumentException异常:(:ID /容器com.cosmic.workorder)的片段PlaceholderFragment {41735b50#0 ID未找到ID 0x7f05003c观点产生的原因= 0x7f05003c}
3月六日至11日:02:30.174:E / AndroidRuntime(1389):在android.support.v4.app.FragmentManagerImpl.moveToState(FragmentManager.java:930)
3月六日至11日:02:30.174:E / AndroidRuntime(1389):在android.support.v4.app.FragmentManagerImpl.moveToState(FragmentManager.java:1115)
3月六日至11日:02:30.174:E / AndroidRuntime(1389):在android.support.v4.app.BackStackRecord.run(BackStackRecord.java:682)
3月六日至11日:02:30.174:E / AndroidRuntime(1389):在android.support.v4.app.FragmentManagerImpl.execPendingActions(FragmentManager.java:1478)
3月六日至11日:02:30.174:E / AndroidRuntime(1389):在android.support.v4.app.FragmentActivity.onStart(FragmentActivity.java:570)
3月六日至11日:02:30.174:E / AndroidRuntime(1389):在android.app.Instrumentation.callActivityOnStart(Instrumentation.java:1171)
3月六日至11日:02:30.174:E / AndroidRuntime(1389):在android.app.Activity.performStart(Activity.java:5143)
3月六日至11日:02:30.174:E / AndroidRuntime(1389):在android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2184)
3月六日至11日:02:30.174:E / AndroidRuntime(1389):11 ...更多
解决方案
您微调可能是片段的布局里面,没有活动......所以,把你的工作里面onCreateView是这样的:
@覆盖
公共查看onCreateView(LayoutInflater充气器,容器的ViewGroup,
捆绑savedInstanceState){
查看rootView = inflater.inflate(R.layout.fragment_new_work_order,
集装箱,FALSE); 微调微调=(微调)rootView.findViewById(R.id.workTypeSpinner);
//使用字符串数组和默认微调布局的ArrayAdapter
ArrayAdapter<串GT;适配器=新ArrayAdapter<串GT;(getActivity()
android.R.layout.simple_spinner_item,R.array.work_type);
//指定布局使用出现的选项列表时,
adapter.setDropDownViewResource(android.R.layout.simple_spinner_dropdown_item);
//应用适配器微调
spinner.setAdapter(适配器); 返回rootView;
}
I find a error when I create a spinner. It seems that the spinner is Null, but I am not sure where is the problem. I have create a string array in strings.xml. Is there any things I missed?
code:
public class NewWorkOrder extends ActionBarActivity {
private Spinner spinner;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_new_work_order);
this.spinner = (Spinner) findViewById(R.id.workTypeSpinner);
// Create an ArrayAdapter using the string array and a default spinner layout
ArrayAdapter<String> adapter = new ArrayAdapter<String>(this,
R.array.work_type, android.R.layout.simple_spinner_item);
// Specify the layout to use when the list of choices appears
adapter.setDropDownViewResource(android.R.layout.simple_spinner_dropdown_item);
// Apply the adapter to the spinner
spinner.setAdapter(adapter);
if (savedInstanceState == null) {
getSupportFragmentManager().beginTransaction()
.add(R.id.container, new PlaceholderFragment()).commit();
}
}
@Override
public boolean onCreateOptionsMenu(Menu menu) {
// Inflate the menu; this adds items to the action bar if it is present.
getMenuInflater().inflate(R.menu.new_work_order, menu);
return true;
}
@Override
public boolean onOptionsItemSelected(MenuItem item) {
// Handle action bar item clicks here. The action bar will
// automatically handle clicks on the Home/Up button, so long
// as you specify a parent activity in AndroidManifest.xml.
int id = item.getItemId();
if (id == R.id.action_settings) {
return true;
}
return super.onOptionsItemSelected(item);
}
/**
* A placeholder fragment containing a simple view.
*/
public static class PlaceholderFragment extends Fragment {
public PlaceholderFragment() {
}
@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
Bundle savedInstanceState) {
View rootView = inflater.inflate(R.layout.fragment_new_work_order,
container, false);
return rootView;
}
}
}
LogCat
06-11 03:02:30.174: E/AndroidRuntime(1389): FATAL EXCEPTION: main
06-11 03:02:30.174: E/AndroidRuntime(1389): java.lang.RuntimeException: Unable to start activity ComponentInfo{com.cosmic.workorder/com.cosmic.workorder.NewWorkOrder}: java.lang.IllegalArgumentException: No view found for id 0x7f05003c (com.cosmic.workorder:id/container) for fragment PlaceholderFragment{41735b50 #0 id=0x7f05003c}
06-11 03:02:30.174: E/AndroidRuntime(1389): at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2211)
06-11 03:02:30.174: E/AndroidRuntime(1389): at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2261)
06-11 03:02:30.174: E/AndroidRuntime(1389): at android.app.ActivityThread.access$600(ActivityThread.java:141)
06-11 03:02:30.174: E/AndroidRuntime(1389): at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1256)
06-11 03:02:30.174: E/AndroidRuntime(1389): at android.os.Handler.dispatchMessage(Handler.java:99)
06-11 03:02:30.174: E/AndroidRuntime(1389): at android.os.Looper.loop(Looper.java:137)
06-11 03:02:30.174: E/AndroidRuntime(1389): at android.app.ActivityThread.main(ActivityThread.java:5103)
06-11 03:02:30.174: E/AndroidRuntime(1389): at java.lang.reflect.Method.invokeNative(Native Method)
06-11 03:02:30.174: E/AndroidRuntime(1389): at java.lang.reflect.Method.invoke(Method.java:525)
06-11 03:02:30.174: E/AndroidRuntime(1389): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:737)
06-11 03:02:30.174: E/AndroidRuntime(1389): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:553)
06-11 03:02:30.174: E/AndroidRuntime(1389): at dalvik.system.NativeStart.main(Native Method)
06-11 03:02:30.174: E/AndroidRuntime(1389): Caused by: java.lang.IllegalArgumentException: No view found for id 0x7f05003c (com.cosmic.workorder:id/container) for fragment PlaceholderFragment{41735b50 #0 id=0x7f05003c}
06-11 03:02:30.174: E/AndroidRuntime(1389): at android.support.v4.app.FragmentManagerImpl.moveToState(FragmentManager.java:930)
06-11 03:02:30.174: E/AndroidRuntime(1389): at android.support.v4.app.FragmentManagerImpl.moveToState(FragmentManager.java:1115)
06-11 03:02:30.174: E/AndroidRuntime(1389): at android.support.v4.app.BackStackRecord.run(BackStackRecord.java:682)
06-11 03:02:30.174: E/AndroidRuntime(1389): at android.support.v4.app.FragmentManagerImpl.execPendingActions(FragmentManager.java:1478)
06-11 03:02:30.174: E/AndroidRuntime(1389): at android.support.v4.app.FragmentActivity.onStart(FragmentActivity.java:570)
06-11 03:02:30.174: E/AndroidRuntime(1389): at android.app.Instrumentation.callActivityOnStart(Instrumentation.java:1171)
06-11 03:02:30.174: E/AndroidRuntime(1389): at android.app.Activity.performStart(Activity.java:5143)
06-11 03:02:30.174: E/AndroidRuntime(1389): at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2184)
06-11 03:02:30.174: E/AndroidRuntime(1389): ... 11 more
解决方案
Your spinner is probably inside fragment layout, not activity... So put your work inside onCreateView like this:
@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
Bundle savedInstanceState) {
View rootView = inflater.inflate(R.layout.fragment_new_work_order,
container, false);
Spinner spinner = (Spinner) rootView.findViewById(R.id.workTypeSpinner);
// Create an ArrayAdapter using the string array and a default spinner layout
ArrayAdapter<String> adapter = new ArrayAdapter<String>(getActivity(),
android.R.layout.simple_spinner_item, R.array.work_type);
// Specify the layout to use when the list of choices appears
adapter.setDropDownViewResource(android.R.layout.simple_spinner_dropdown_item);
// Apply the adapter to the spinner
spinner.setAdapter(adapter);
return rootView;
}
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