【发布时间】：2016-05-01 05:06:35
【问题描述】：
我正在开发一个卡路里应用程序。我现在遇到的问题是，如果用户决定在不输入任何内容的情况下按下保存，应用程序应该通知用户他们必须输入一些内容才能节省卡路里。当用户输入正确的编辑文本值时，该应用程序将起作用。
问题：当用户在没有输入任何内容时单击保存按钮时应用程序崩溃。
日志猫。
05-01 12:46:50.294 1810-1810/com.example.treycoco.calorietracker E/AndroidRuntime: FATAL EXCEPTION: main
Process: com.example.treycoco.calorietracker, PID: 1810
java.lang.NumberFormatException: Invalid int: ""
at java.lang.Integer.invalidInt(Integer.java:137)
at java.lang.Integer.parseInt(Integer.java:358)
at java.lang.Integer.parseInt(Integer.java:331)
at com.example.treycoco.calorietracker.AddEntry.saveDataToDB(AddEntry.java:100)
at com.example.treycoco.calorietracker.AddEntry$1.onClick(AddEntry.java:79)
at android.view.View.performClick(View.java:4438)
at android.view.View$PerformClick.run(View.java:18422)
at android.os.Handler.handleCallback(Handler.java:733)
at android.os.Handler.dispatchMessage(Handler.java:95)
at android.os.Looper.loop(Looper.java:136)
at android.app.ActivityThread.main(ActivityThread.java:5045)
at java.lang.reflect.Method.invokeNative(Native Method)
at java.lang.reflect.Method.invoke(Method.java:515)
at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:779)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:595)
at dalvik.system.NativeStart.main(Native Method)
AddEntry.java
public class AddEntry extends Fragment implements
View.OnClickListener {
EditText DescriptionET,CalorieET;
ImageButton Savebtn, Cancelbtn;
String description , calorieAmt;
//database
private DatabaseHandler dba;
public AddEntry() {
// Required empty public constructor
}
@Override
public View onCreateView(LayoutInflater inflater,
ViewGroup container,
Bundle savedInstanceState) {
// Inflate the layout for this fragment
View myView =
inflater.inflate(R.layout.fragment_add_entry,
container, false);
Savebtn = (ImageButton) myView.findViewById(R.id.SaveBtn);
Savebtn.setBackgroundColor(Color.TRANSPARENT);
Savebtn.setOnClickListener(this);
Cancelbtn = (ImageButton) myView.findViewById(R.id.CancelBtn);
Cancelbtn.setBackgroundColor(Color.TRANSPARENT);
Cancelbtn.setOnClickListener(this);
return myView;
}
@Override
public void onViewCreated(View view, Bundle savedInstanceState)
{
super.onViewCreated(view, savedInstanceState);
DescriptionET= (EditText)view.findViewById(R.id.foodEditText);
DescriptionET.setInputType(InputType.TYPE_CLASS_TEXT);
CalorieET=(EditText)view.findViewById(R.id.caloriesEditText);
CalorieET.setInputType(InputType.TYPE_CLASS_NUMBER);
//save to database:
dba = new DatabaseHandler(getContext());
Savebtn.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View arg0) {
saveDataToDB();
}
});
}
public void saveDataToDB (){
Food food = new Food();
String name = DescriptionET.getText().toString().trim();
String calString = CalorieET.getText().toString().trim();
//convert the claories numbers to text
int cal = Integer.parseInt(calString);
if (DescriptionET.getText().toString().equals("") ||
CalorieET.getText().toString().equals("0")){
Toast.makeText(getActivity(), "Please enter information",
Toast.LENGTH_LONG).show();
}else{
food.setFoodName(name);
food.setCalories(cal);
//call addFood method from the DatabaseHandler
dba.addFood(food);
dba.close();
//clear the editTexts
DescriptionET.setText("");
CalorieET.setText("");
//take the user to the next screen
//
((appMain) getActivity()).loadSelection(0);;
}
}
@Override
public void onClick(View v) {
switch (v.getId()) {
case R.id.SaveBtn:
description = DescriptionET.getText().toString();
calorieAmt=CalorieET.getText().toString();
if (DescriptionET.getText().toString().equals("") ||
CalorieET.getText().toString().equals("0")){
Toast.makeText(getActivity(), "Please enter information",
Toast.LENGTH_LONG).show();
}
break;
case R.id.CancelBtn:
EditText descriptionET=
(EditText)getView().findViewById(R.id.foodEditText);
descriptionET.setText("");
EditText calorieET=
(EditText)getView().findViewById(R.id.caloriesEditText);
calorieET.setText("");
break;
}
}
}
【问题讨论】：
标签： java android android-fragments button toast