我很努力地在我的android应用程序中使用EditText的输入。我输入了十进制值,我已经解决了小数点,但是当我删除EditText的所有内容时,我的应用程序崩溃。我在EditText小部件的onTextChanged函数中检查NULL或“”的值,但是这被超过。这里是我的相关功能:Android EditText字符串返回到“”
private void initializeEditTextListener(){
final TextView resultView = (TextView)findViewById(R.id.resultView);
final EditText userInput = (EditText)findViewById(R.id.haveTextField);
userInput.addTextChangedListener(new TextWatcher()
{
@Override
public void afterTextChanged(Editable s) {
}
@Override
public void beforeTextChanged(CharSequence s, int start, int count, int after) {
}
@Override
public void onTextChanged(CharSequence s, int start, int before, int count) {
String inputString = userInput.getText().toString();
if(inputString != null && inputString != "")
{
double input = Double.parseDouble(inputString); //<-line causing error
double result = input * getFactorFromTable(); //specified in logcat
resultView.setText(Double.toString(result));
}
else
{
resultView.setText("");
}
}
}
);
}
我的logcat:
10-19 17:53:59.313 16225-16225/khandy.application.convertible E/AndroidRuntime:致命异常:主要 的Java。 lang.NumberFormatException:无效的double:“” at java.lang.StringToReal.invalidReal(StringToReal.java:63) at java.lang.StringToReal.parseDouble(StringToReal.java:248) at java.lang.Double.parseDouble (Double.java:295) at khandy.application.convertible.EntryActivity $ 1.onTextChang ed(EntryActivity.java:237) at android.widget.TextView.sendOnTextChanged(TextView.java:7405) at android.widget.TextView.handleTextChanged(TextView.java:7467) at android.widget.TextView $ ChangeWatcher。 onTextChanged(TextView.java:9218) 在android.text.SpannableStringBuilder.sendTextChanged(SpannableStringBuilder.java:962) 在android.text.SpannableStringBuilder.replace(SpannableStringBuilder.java:496) 在android.text.SpannableStringBuilder.delete( SpannableStringBuilder.java:212) 在android.text.SpannableStringBuilder.delete(SpannableStringBuilder.java:30) 在android.text.method.BaseKeyListener.backspaceOrForwardDelete(BaseKeyListener.java:94) 在android.text.method.BaseKeyListener。 (android.text.method.NumberKeyListener.onKeyDown(NumberKeyListener.java:138) at android.widget。 TextView.doKeyDown(TextView.java:5544) at android.widget.TextView.onKeyDown(TextView.java:5356) at android.view.KeyEvent.dispatch(KeyEvent.java:2705) at android.view.View。 dispatchKeyEvent(View.java:7205) 在android.view.ViewGroup.dispatchKeyEvent(ViewGroup.java:1363) 在android.view.ViewGroup.dispatchKeyEvent(ViewGroup.java:1363) 在android.view.ViewGroup.dispatchKeyEvent( ViewGroup.java:1363) at android.view.ViewGroup.dispatchKeyEvent(View Group.java:1363) at com.android.internal.policy.impl.PhoneWindow $ DecorView.superDispatchKeyEvent(PhoneWindow.java:2083) at com.android.internal.policy.impl.PhoneWindow.superDispatchKeyEvent(PhoneWindow.java: 1459) at android.app.Activity.dispatchKeyEvent(Activity.java:2416) at com.android.internal.policy.impl.PhoneWindow $ DecorView.dispatchKeyEvent(PhoneWindow.java:2010) at android.view.ViewRootImpl。 deliverKeyEventPostIme(ViewRootImpl.java:3894) 在android.view.ViewRootImpl.deliverKeyEvent(ViewRootImpl.java:3828) 在android.view.ViewRootImpl.deliverInputEvent(ViewRootImpl.java:3385) 在android.view.ViewRootImpl.doProcessInputEvents( ViewRootImpl.java:4483) at android.view.ViewRoo tImpl.enqueueInputEvent(ViewRootImpl.java:4461) at android.view.ViewRootImpl $ ViewRootHandler.handleMessage(ViewRootImpl.java:3146) at android.os.Handler.dispatchMessage(Handler.java:99) at android.os。 Looper.loop(Looper.java:137) at android.app.ActivityThread.main(ActivityThread.java:4950) at java.lang.reflect.Method。invokeNative(Native Method) at java.lang.reflect.Method.invoke(Method.java:511) at com.android.internal.os.ZygoteInit $ MethodAndArgsCaller.run(ZygoteInit.java:1004) at com.android .internal.os.ZygoteInit.main(ZygoteInit.java:771) 在dalvik.system.NativeStart.main(本机方法)
我关心的是,我被告知无效的双被“” ,但我正在检查这样的事件...
感谢您的帮助!
太棒了!异常路线更有意义。这将涵盖比我明确检查更多的情况。谢谢! – Freestyle076