单击时的Android微调崩溃 [英] Android spinner crashing when clicked on
问题描述
我有一个微调
我的页面,该页面使用 arrayAdapter
填充上。当我启动我的应用程序一切正常,但此刻我点击微调
,应用程序崩溃和的logcat
给在我code到A线没有提及。这里是$ C $的C指的是微调的区域:
型材=(微调)findViewById(R.id.spinner1); SetSql getprofiles =新SetSql(本);
getprofiles.open();
spinnerArray = getprofiles.getProfiles();
如果(spinnerArray [0] == NULL){
spinnerArray =新的String [1];
spinnerArray [0] =没有配置文件,请创建一个
}
getprofiles.close(); ArrayAdapter<串GT;阵列=新ArrayAdapter<串GT;(UserActivity.this,android.R.layout.simple_spinner_item,spinnerArray);
array.setDropDownViewResource(android.R.layout.simple_spinner_dropdown_item);
profiles.setAdapter(数组); //我使用POST方法,以确保此微调不会运行在活动启动
profiles.post(新的Runnable(){
公共无效的run(){
profiles.setOnItemSelectedListener(新OnItemSelectedListener(){ @覆盖
公共无效onItemSelected(适配器视图<>的ListView,查看ARG1,
INT POS,长ARG3){
// TODO自动生成方法存根
如果(!profiles.getItemAtPosition(POS)的ToString()。等于(没有配置文件,请创建一个)){
字符串选择= profiles.getItemAtPosition(POS)的ToString();
意向意图=新意图(UserActivity.this,DPAActivity.class);
intent.putExtra(用户名,选择);
startActivity(意向);
}
} @覆盖
公共无效onNothingSelected(适配器视图<>为arg0){
// TODO自动生成方法存根 }
});
} });
更多logcat的:
03-07 16:25:45.740:E / AndroidRuntime(6929):致命异常:主要
03-07 16:25:45.740:E / AndroidRuntime(6929):显示java.lang.NullPointerException
03-07 16:25:45.740:E / AndroidRuntime(6929):在android.widget.ArrayAdapter.createViewFromResource(ArrayAdapter.java:355)
03-07 16:25:45.740:E / AndroidRuntime(6929):在android.widget.ArrayAdapter.getDropDownView(ArrayAdapter.java:376)
03-07 16:25:45.740:E / AndroidRuntime(6929):在android.widget.Spinner $ DropDownAdapter.getDropDownView(Spinner.java:332)
03-07 16:25:45.740:E / AndroidRuntime(6929):在android.widget.Spinner $ DropDownAdapter.getView(Spinner.java:328)
03-07 16:25:45.740:E / AndroidRuntime(6929):在android.widget.AbsListView.obtainView(AbsListView.java:1409)
03-07 16:25:45.740:E / AndroidRuntime(6929):在android.widget.ListView.measureHeightOfChildren(ListView.java:1216)
03-07 16:25:45.740:E / AndroidRuntime(6929):在android.widget.ListView.onMeasure(ListView.java:1127)
03-07 16:25:45.740:E / AndroidRuntime(6929):在android.view.View.measure(View.java:8313)
03-07 16:25:45.740:E / AndroidRuntime(6929):在android.view.ViewGroup.measureChildWithMargins(ViewGroup.java:3138)
03-07 16:25:45.740:E / AndroidRuntime(6929):在android.widget.LinearLayout.measureChildBeforeLayout(LinearLayout.java:1017)
03-07 16:25:45.740:E / AndroidRuntime(6929):在android.widget.LinearLayout.measureVertical(LinearLayout.java:386)
03-07 16:25:45.740:E / AndroidRuntime(6929):在android.widget.LinearLayout.onMeasure(LinearLayout.java:309)
03-07 16:25:45.740:E / AndroidRuntime(6929):在android.view.View.measure(View.java:8313)
03-07 16:25:45.740:E / AndroidRuntime(6929):在android.view.ViewGroup.measureChildWithMargins(ViewGroup.java:3138)
03-07 16:25:45.740:E / AndroidRuntime(6929):在android.widget.LinearLayout.measureChildBeforeLayout(LinearLayout.java:1017)
03-07 16:25:45.740:E / AndroidRuntime(6929):在android.widget.LinearLayout.measureVertical(LinearLayout.java:386)
03-07 16:25:45.740:E / AndroidRuntime(6929):在android.widget.LinearLayout.onMeasure(LinearLayout.java:309)
03-07 16:25:45.740:E / AndroidRuntime(6929):在com.android.internal.widget.WeightedLinearLayout.onMeasure(WeightedLinearLayout.java:60)
03-07 16:25:45.740:E / AndroidRuntime(6929):在android.view.View.measure(View.java:8313)
03-07 16:25:45.740:E / AndroidRuntime(6929):在android.view.ViewGroup.measureChildWithMargins(ViewGroup.java:3138)
03-07 16:25:45.740:E / AndroidRuntime(6929):在android.widget.FrameLayout.onMeasure(FrameLayout.java:250)
03-07 16:25:45.740:E / AndroidRuntime(6929):在android.view.View.measure(View.java:8313)
03-07 16:25:45.740:E / AndroidRuntime(6929):在android.view.ViewGroup.measureChildWithMargins(ViewGroup.java:3138)
03-07 16:25:45.740:E / AndroidRuntime(6929):在android.widget.FrameLayout.onMeasure(FrameLayout.java:250)
03-07 16:25:45.740:E / AndroidRuntime(6929):在android.view.View.measure(View.java:8313)
03-07 16:25:45.740:E / AndroidRuntime(6929):在android.view.ViewRoot.performTraversals(ViewRoot.java:839)
03-07 16:25:45.740:E / AndroidRuntime(6929):在android.view.ViewRoot.handleMessage(ViewRoot.java:1859)
03-07 16:25:45.740:E / AndroidRuntime(6929):在android.os.Handler.dispatchMessage(Handler.java:99)
03-07 16:25:45.740:E / AndroidRuntime(6929):在android.os.Looper.loop(Looper.java:130)
03-07 16:25:45.740:E / AndroidRuntime(6929):在android.app.ActivityThread.main(ActivityThread.java:3683)
03-07 16:25:45.740:E / AndroidRuntime(6929):在java.lang.reflect.Method.invokeNative(本机方法)
03-07 16:25:45.740:E / AndroidRuntime(6929):在java.lang.reflect.Method.invoke(Method.java:507)
03-07 16:25:45.740:E / AndroidRuntime(6929):在com.android.internal.os.ZygoteInit $ MethodAndArgsCaller.run(ZygoteInit.java:839)
03-07 16:25:45.740:E / AndroidRuntime(6929):在com.android.internal.os.ZygoteInit.main(ZygoteInit.java:597)
03-07 16:25:45.740:E / AndroidRuntime(6929):在dalvik.system.NativeStart.main(本机方法)
我的getProfiles code
公共无效createProfile(字符串名称){
// TODO自动生成方法存根
ContentValues CV =新ContentValues();
cv.put(KEY_USER,名);
ourDatabase.insert(TABLE_USERS,空,CV);
} 公众的String [] getProfiles()抛出的SQLException {
的String [] =列新的String [] {} KEY_USER;
光标C = ourDatabase.query(TABLE_USERS,列,NULL,NULL,NULL,NULL,KEY_ROWID);
的String []结果=新的String [100]; INT INAME = c.getColumnIndex(KEY_USER);
诠释计数= 0;
为(c.moveToFirst();!c.isAfterLast(); c.moveToNext()){
结果[计数] = c.getString(INAME);
算上++;
}
返回结果;
}
}
这是返回一个字符串数组。
如果(arrayspinner [0] == NULL){
arrayspinner =新的String [1];
arrayspinner [0] =没有配置文件,请创建一个
}
更改code和尝试
编辑:
而不是阵列
尝试使用的ArrayList
列表<串GT; ArrayList的= Arrays.asList(你的字符串数组);
或者尝试让你的响应的大小来初始化数组。
编辑2:
列表<串GT; A = Arrays.asList(新的String [] {});
如果(a.size()== 0){
一个=新的ArrayList<串GT;();
a.add(XXX);
a.add(BBBB);
}
最后的微调S =(微调)findViewById(R.id.spinner1);
ArrayAdapter<串GT;阵列=新ArrayAdapter<串GT;(这一点,android.R.layout.simple_spinner_item,一);
array.setDropDownViewResource(android.R.layout.simple_spinner_dropdown_item);
s.setAdapter(数组);
s.post(新的Runnable(){ @覆盖
公共无效的run(){
// TODO自动生成方法存根
s.setOnItemSelectedListener(新OnItemSelectedListener(){ @覆盖
公共无效onItemSelected(适配器视图<>为arg0,ARG1查看,
INT ARG2,长ARG3){
// TODO自动生成方法存根 } @覆盖
公共无效onNothingSelected(适配器视图<>为arg0){
// TODO自动生成方法存根 }
});
}
});
试用了样品与您的code和它的作品。
编辑3:
公共字符串[] getProfiles()抛出的SQLException {
的String [] =列新的String [] {} KEY_USER;
光标C = ourDatabase.query(TABLE_USERS,列,NULL,NULL,NULL,NULL,KEY_ROWID);
的String []的结果;
如果(C =空&放大器;!&放大器;!c.getCount()= 0){
结果=新的String [c.getCount()]; INT INAME = c.getColumnIndex(KEY_USER);
诠释计数= 0;
为(c.moveToFirst();!c.isAfterLast(); c.moveToNext()){
结果[计数] = c.getString(INAME);
算上++;
}
}其他{
结果=新的String [] {没有配置文件,请创建一个};
}
返回结果;
}
I have a spinner
on my page, which is populated using an arrayAdapter
. When i launch my app everything is ok, but the moment i click on the spinner
, the app crashes and logcat
gives me no reference to a line in my code. Here is the area of the code referring to the spinner:
profiles = (Spinner) findViewById(R.id.spinner1);
SetSql getprofiles = new SetSql(this);
getprofiles.open();
spinnerArray = getprofiles.getProfiles();
if(spinnerArray[0]==null){
spinnerArray = new String[1];
spinnerArray[0] = "No Profiles, Please Create One";
}
getprofiles.close();
ArrayAdapter<String> array = new ArrayAdapter<String>(UserActivity.this, android.R.layout.simple_spinner_item, spinnerArray);
array.setDropDownViewResource(android.R.layout.simple_spinner_dropdown_item);
profiles.setAdapter(array);
//I am using the post method to make sure that this spinner wont run when the activity is started
profiles.post(new Runnable(){
public void run(){
profiles.setOnItemSelectedListener(new OnItemSelectedListener() {
@Override
public void onItemSelected(AdapterView<?> ListView, View arg1,
int pos, long arg3) {
// TODO Auto-generated method stub
if(!profiles.getItemAtPosition(pos).toString().equals("No Profiles, Please Create One")){
String selected = profiles.getItemAtPosition(pos).toString();
Intent intent = new Intent(UserActivity.this, DPAActivity.class);
intent.putExtra("username", selected);
startActivity(intent);
}
}
@Override
public void onNothingSelected(AdapterView<?> arg0) {
// TODO Auto-generated method stub
}
});
}
});
More logcat:
03-07 16:25:45.740: E/AndroidRuntime(6929): FATAL EXCEPTION: main
03-07 16:25:45.740: E/AndroidRuntime(6929): java.lang.NullPointerException
03-07 16:25:45.740: E/AndroidRuntime(6929): at android.widget.ArrayAdapter.createViewFromResource(ArrayAdapter.java:355)
03-07 16:25:45.740: E/AndroidRuntime(6929): at android.widget.ArrayAdapter.getDropDownView(ArrayAdapter.java:376)
03-07 16:25:45.740: E/AndroidRuntime(6929): at android.widget.Spinner$DropDownAdapter.getDropDownView(Spinner.java:332)
03-07 16:25:45.740: E/AndroidRuntime(6929): at android.widget.Spinner$DropDownAdapter.getView(Spinner.java:328)
03-07 16:25:45.740: E/AndroidRuntime(6929): at android.widget.AbsListView.obtainView(AbsListView.java:1409)
03-07 16:25:45.740: E/AndroidRuntime(6929): at android.widget.ListView.measureHeightOfChildren(ListView.java:1216)
03-07 16:25:45.740: E/AndroidRuntime(6929): at android.widget.ListView.onMeasure(ListView.java:1127)
03-07 16:25:45.740: E/AndroidRuntime(6929): at android.view.View.measure(View.java:8313)
03-07 16:25:45.740: E/AndroidRuntime(6929): at android.view.ViewGroup.measureChildWithMargins(ViewGroup.java:3138)
03-07 16:25:45.740: E/AndroidRuntime(6929): at android.widget.LinearLayout.measureChildBeforeLayout(LinearLayout.java:1017)
03-07 16:25:45.740: E/AndroidRuntime(6929): at android.widget.LinearLayout.measureVertical(LinearLayout.java:386)
03-07 16:25:45.740: E/AndroidRuntime(6929): at android.widget.LinearLayout.onMeasure(LinearLayout.java:309)
03-07 16:25:45.740: E/AndroidRuntime(6929): at android.view.View.measure(View.java:8313)
03-07 16:25:45.740: E/AndroidRuntime(6929): at android.view.ViewGroup.measureChildWithMargins(ViewGroup.java:3138)
03-07 16:25:45.740: E/AndroidRuntime(6929): at android.widget.LinearLayout.measureChildBeforeLayout(LinearLayout.java:1017)
03-07 16:25:45.740: E/AndroidRuntime(6929): at android.widget.LinearLayout.measureVertical(LinearLayout.java:386)
03-07 16:25:45.740: E/AndroidRuntime(6929): at android.widget.LinearLayout.onMeasure(LinearLayout.java:309)
03-07 16:25:45.740: E/AndroidRuntime(6929): at com.android.internal.widget.WeightedLinearLayout.onMeasure(WeightedLinearLayout.java:60)
03-07 16:25:45.740: E/AndroidRuntime(6929): at android.view.View.measure(View.java:8313)
03-07 16:25:45.740: E/AndroidRuntime(6929): at android.view.ViewGroup.measureChildWithMargins(ViewGroup.java:3138)
03-07 16:25:45.740: E/AndroidRuntime(6929): at android.widget.FrameLayout.onMeasure(FrameLayout.java:250)
03-07 16:25:45.740: E/AndroidRuntime(6929): at android.view.View.measure(View.java:8313)
03-07 16:25:45.740: E/AndroidRuntime(6929): at android.view.ViewGroup.measureChildWithMargins(ViewGroup.java:3138)
03-07 16:25:45.740: E/AndroidRuntime(6929): at android.widget.FrameLayout.onMeasure(FrameLayout.java:250)
03-07 16:25:45.740: E/AndroidRuntime(6929): at android.view.View.measure(View.java:8313)
03-07 16:25:45.740: E/AndroidRuntime(6929): at android.view.ViewRoot.performTraversals(ViewRoot.java:839)
03-07 16:25:45.740: E/AndroidRuntime(6929): at android.view.ViewRoot.handleMessage(ViewRoot.java:1859)
03-07 16:25:45.740: E/AndroidRuntime(6929): at android.os.Handler.dispatchMessage(Handler.java:99)
03-07 16:25:45.740: E/AndroidRuntime(6929): at android.os.Looper.loop(Looper.java:130)
03-07 16:25:45.740: E/AndroidRuntime(6929): at android.app.ActivityThread.main(ActivityThread.java:3683)
03-07 16:25:45.740: E/AndroidRuntime(6929): at java.lang.reflect.Method.invokeNative(Native Method)
03-07 16:25:45.740: E/AndroidRuntime(6929): at java.lang.reflect.Method.invoke(Method.java:507)
03-07 16:25:45.740: E/AndroidRuntime(6929): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:839)
03-07 16:25:45.740: E/AndroidRuntime(6929): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:597)
03-07 16:25:45.740: E/AndroidRuntime(6929): at dalvik.system.NativeStart.main(Native Method)
My getProfiles Code
public void createProfile(String name) {
// TODO Auto-generated method stub
ContentValues cv = new ContentValues();
cv.put(KEY_USER, name);
ourDatabase.insert(TABLE_USERS, null, cv);
}
public String[] getProfiles() throws SQLException{
String[] columns = new String[]{KEY_USER};
Cursor c = ourDatabase.query(TABLE_USERS, columns, null, null, null, null, KEY_ROWID);
String[] result = new String[100];
int iName = c.getColumnIndex(KEY_USER);
int count = 0;
for(c.moveToFirst(); !c.isAfterLast(); c.moveToNext()){
result[count] = c.getString(iName);
count++;
}
return result;
}
}
This is returning a string array.
if(arrayspinner[0]==null){
arrayspinner = new String[1];
arrayspinner[0] = "No Profiles, Please Create One";
}
change your code and try
EDIT:
instead of Array
try using ArrayList
List<String> arrayList=Arrays.asList(your string array);
or else try to initialize your array by getting the size of your response.
EDIT 2:
List<String> a= Arrays.asList(new String[]{});
if(a.size()==0){
a=new ArrayList<String>();
a.add("xxx");
a.add("bbbb");
}
final Spinner s=(Spinner)findViewById(R.id.spinner1);
ArrayAdapter<String> array = new ArrayAdapter<String>(this, android.R.layout.simple_spinner_item, a);
array.setDropDownViewResource(android.R.layout.simple_spinner_dropdown_item);
s.setAdapter(array);
s.post(new Runnable() {
@Override
public void run() {
// TODO Auto-generated method stub
s.setOnItemSelectedListener(new OnItemSelectedListener() {
@Override
public void onItemSelected(AdapterView<?> arg0, View arg1,
int arg2, long arg3) {
// TODO Auto-generated method stub
}
@Override
public void onNothingSelected(AdapterView<?> arg0) {
// TODO Auto-generated method stub
}
});
}
});
tried a sample same as your code and it works.
EDIT 3:
public String[] getProfiles() throws SQLException{
String[] columns = new String[]{KEY_USER};
Cursor c = ourDatabase.query(TABLE_USERS, columns, null, null, null, null, KEY_ROWID);
String[] result;
if(c != null && c.getCount()!=0){
result = new String[c.getCount()];
int iName = c.getColumnIndex(KEY_USER);
int count = 0;
for(c.moveToFirst(); !c.isAfterLast(); c.moveToNext()){
result[count] = c.getString(iName);
count++;
}
}else{
result = new String[]{"No Profiles, Please Create One"};
}
return result;
}
这篇关于单击时的Android微调崩溃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!