我在填充ListView时遇到问题。 Logcat节目 NullPointerExcepton。我还在下面发布了代码和logcat。
代码是匆忙做的，我只是一个初学者。但我不是 能够解决..那个textview显示getname（）返回值..但是它 显示空指针异常..任何建议？
BankFunctionalities.java：
public class BankFunctionalities extends Activity {
private ListView ls;
ArrayAdapter<String> arrayAdapter;
DetailsVO details;
private String phoneNumber;
private String smsSend;
private String msgNumber;
private AlertDialog dialog;
static ArrayList<String> serviceList;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.bank_functionalities);
details = (DetailsVO) ApplicationCache.getInstance().getValue("details");
TextView headerText = (TextView)findViewById(R.id.header_text);
headerText.setText(details.getName());
phoneNumber = details.getShortPhoneNumber();
ImageView callButton = (ImageView)findViewById(R.id.call_icon);
if(details.getCustomerCareNumber() != null &&
!details.getCustomerCareNumber().equalsIgnoreCase("")){
callButton.setVisibility(View.VISIBLE);
callButton.setOnClickListener(new OnClickListener() {
TelephonyManager telMgr = (TelephonyManager) getSystemService(Context.TELEPHONY_SERVICE);
int simState = telMgr.getSimState();
@Override
public void onClick(View v) {
// TODO Auto-generated method stub
switch (simState) {
case TelephonyManager.SIM_STATE_ABSENT:
// do something
showErrorDialog(BankFunctionalities.this.getString(R.string.no_SIM));
return;
case TelephonyManager.SIM_STATE_READY:
// do something
Intent intent = new Intent(Intent.ACTION_DIAL);
intent.setData(Uri.parse("tel:"+details.getCustomerCareNumber()));
startActivity(intent);
//break;
}
}
});
}
TelephonyManager telMgr = (TelephonyManager) getSystemService(Context.TELEPHONY_SERVICE);
final int simState1 = telMgr.getSimState();
final LinkedHashMap<String, FunctionVO> map = details.getFunctionalities();
ls = (ListView)findViewById(R.id.apna_list);
arrayAdapter = new ArrayAdapter<String>(this, R.layout.apk_list_second_item, R.id.text_item);
for(String s: map.keySet()){
arrayAdapter.add(s);
}
arrayAdapter.add(details.getsWebsite());
ls.setAdapter(arrayAdapter);
ls.setOnItemClickListener(new OnItemClickListener() {
@Override
public void onItemClick(AdapterView<?> parent, View view, int position,
long id) {
if(position != map.keySet().size()+1){
String sms = map.get(arrayAdapter.getItem(position)).getSmsName();
msgNumber = map.get(arrayAdapter.getItem(position)).getMsgNumber();
if(sms.contains("$"))
{
String[] service;
serviceList = new ArrayList<String>();
service = sms.split("\\$");
for(String s : service)
{
serviceList.add(s);
}
Intent serviceIntent = new Intent(BankFunctionalities.this,ApnaService.class);
serviceIntent.putExtra("services", serviceList);
startActivity(serviceIntent);
Log.d("TestTag","serviceList is"+"'"+serviceList);
}
else if(sms.contains("|")){
ApplicationCache.getInstance().setValue("value", sms);
Intent detailsIntent = new Intent(BankFunctionalities.this,BankDetailsActivity.class);
detailsIntent.putExtra("bankName", details.getName());
detailsIntent.putExtra("value", map.get(arrayAdapter.getItem(position)).getSmsName());
detailsIntent.putExtra("phoneNumber", details.getShortPhoneNumber());
detailsIntent.putExtra("customerCare", details.getCustomerCareNumber());
detailsIntent.putExtra("msgNumber", map.get(arrayAdapter.getItem(position)).getMsgNumber());
startActivity(detailsIntent);
}
else
{
smsSend = sms;
switch (simState1) {
case TelephonyManager.SIM_STATE_ABSENT:
// do something
showErrorDialog(BankFunctionalities.this.getString(R.string.no_SIM));
return;
case TelephonyManager.SIM_STATE_READY:
// do something
String smsConfirm = BankFunctionalities.this.getResources().getString(R.string.sms_charge).concat(sms);
showDialog(smsConfirm);
//break;
}
//showDialog(sms);
}
}else{
//As last item in the list is the website URL
//TextView title = (TextView)ls.findViewById(R.id.title);
String url = arrayAdapter.getItem(position);
Intent i = new Intent(Intent.ACTION_VIEW);
i.setData(Uri.parse(url));
startActivity(i);
}
}
});
}
private void showDialog(final String message){
//Created dummy dialog for now
//Need to implement integration with mBanking server for payment
AlertDialog.Builder builder = new AlertDialog.Builder(
this);
builder.setMessage(message);
builder.setPositiveButton("Ok",
new DialogInterface.OnClickListener() {
@Override
public void onClick(
DialogInterface dialog,
int which) {
String errorMessage = null;
try{
if(msgNumber != null)
{
Log.d("Message Number","Number is"+"'"+msgNumber+"'");
SmsManager smsManager = SmsManager.getDefault();
smsManager.sendTextMessage(msgNumber, null, smsSend, null, null);
}
else
{
Log.d("Message Number","Number is"+"'"+phoneNumber+"'");
SmsManager smsManager = SmsManager.getDefault();
smsManager.sendTextMessage(phoneNumber, null, smsSend, null, null);
}
}catch(Exception e){
errorMessage = BankFunctionalities.this.getResources().getString(R.string.sms_failed);
}
dialog.dismiss();
//if(errorMessage != null){
//showErrorDialog(errorMessage);
//}else{
//showErrorDialog(BankFunctionalities.this.getString(R.string.sms_success));
//}
}
});
dialog = builder.create();
dialog.show();
}
private void showErrorDialog(String message){
//Created dummy dialog for now
//Need to implement integration with mBanking server for payment
AlertDialog.Builder builder = new AlertDialog.Builder(
this);
builder.setMessage(message);
builder.setPositiveButton("Ok",
new DialogInterface.OnClickListener() {
@Override
public void onClick(
DialogInterface dialog,
int which) {
dialog.dismiss();
}
});
dialog = builder.create();
dialog.show();
}
}
Apnaservice.java：
public class ApnaService extends Activity
{
ArrayList<String> list = new ArrayList<String>();
ListView lv;
ArrayAdapter<String> adapter;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.second_layout);
list = BankFunctionalities.serviceList;
Log.d("TestTag","List is:"+list);
lv = (ListView) findViewById(R.id.listView_layout);
adapter = new ArrayAdapter<String>(this,R.layout.testview_info,R.id.text_item);
for (String s : list)
{
adapter.add(s);
}
lv.setAdapter(adapter);
lv.setOnItemClickListener(new OnItemClickListener() {
@Override
public void onItemClick(AdapterView<?> parent, View view, int position,
long id) {
String value = (lv.getItemAtPosition(position).toString());
Log.d("TestTag","List is inside click:"+list);
if (value.equalsIgnoreCase("BulletPay"))
{
Intent bulletIntent = new Intent(ApnaService.this,MainScreenTab.class);
/*final Intent it = new Intent();
it.setClassName("com.bullet.pay", com.bullet.pay.MainScreenTab.class);*/
startActivity(bulletIntent);
}
/*switch (value) {
case "BulletPay":
Intent bulletIntent = new Intent(ApnaService.this,ListAllMerchants.class);
startActivity(bulletIntent);
}*/
}
});
}
}// End ApnaService
这是Logacat：
07-24 01:32:16.500: E/AndroidRuntime(2936): FATAL EXCEPTION: main
07-24 01:32:16.500: E/AndroidRuntime(2936): Process: com.apna.khata, PID: 2936
07-24 01:32:16.500: E/AndroidRuntime(2936): java.lang.RuntimeException: Unable to start activity ComponentInfo{com.apna.khata/com.apna.khata.BankFunctionalities}: java.lang.NullPointerException
07-24 01:32:16.500: E/AndroidRuntime(2936): at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2195)
07-24 01:32:16.500: E/AndroidRuntime(2936): at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2245)
07-24 01:32:16.500: E/AndroidRuntime(2936): at android.app.ActivityThread.access$800(ActivityThread.java:135)
07-24 01:32:16.500: E/AndroidRuntime(2936): at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1196)
07-24 01:32:16.500: E/AndroidRuntime(2936): at android.os.Handler.dispatchMessage(Handler.java:102)
07-24 01:32:16.500: E/AndroidRuntime(2936): at android.os.Looper.loop(Looper.java:136)
07-24 01:32:16.500: E/AndroidRuntime(2936): at android.app.ActivityThread.main(ActivityThread.java:5017)
07-24 01:32:16.500: E/AndroidRuntime(2936): at java.lang.reflect.Method.invokeNative(Native Method)
07-24 01:32:16.500: E/AndroidRuntime(2936): at java.lang.reflect.Method.invoke(Method.java:515)
07-24 01:32:16.500: E/AndroidRuntime(2936): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:779)
07-24 01:32:16.500: E/AndroidRuntime(2936): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:595)
07-24 01:32:16.500: E/AndroidRuntime(2936): at dalvik.system.NativeStart.main(Native Method)
07-24 01:32:16.500: E/AndroidRuntime(2936): Caused by: java.lang.NullPointerException
07-24 01:32:16.500: E/AndroidRuntime(2936): at com.apna.khata.BankFunctionalities.onCreate(BankFunctionalities.java:49)
07-24 01:32:16.500: E/AndroidRuntime(2936): at android.app.Activity.performCreate(Activity.java:5231)
07-24 01:32:16.500: E/AndroidRuntime(2936): at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1087)
07-24 01:32:16.500: E/AndroidRuntime(2936): at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2159)
07-24 01:32:16.500: E/AndroidRuntime(2936): ... 11 more
07-24 01:32:16.510: W/ActivityManager(1385): Force finishing activity com.apna.khata/.BankFunctionalities