在 Android 中将小数而不是数字添加到 edittext 时应用程序崩溃
Application get crash when adding decimal instead of number into edittext in Android
我正在创建一个计算器类型的应用程序，它 returns 使用 TextWatcher 函数计算一堆 EditText 字段。我遇到的问题是，当我在数字前输入小数时，我的应用程序崩溃了。这是我目前所拥有的。
public class MainActivity extends ActionBarActivity {
EditText editText1;
EditText editText2;
EditText editText4;
EditText editText3;
EditText editText5;
EditText editText6;
EditText editText7;
EditText editText8;
TextView textViewtotal;
TextView textViewnet;
TextView textViewproceeds;
TextView textViewprof;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
editText1 = (EditText) findViewById(R.id.editText1);
editText2 = (EditText) findViewById(R.id.editText2);
editText3 = (EditText) findViewById(R.id.editText3);
editText4 = (EditText) findViewById(R.id.editText4);
editText5 = (EditText) findViewById(R.id.editText5);
editText6 = (EditText) findViewById(R.id.editText6);
editText7 = (EditText) findViewById(R.id.editText7);
editText8 = (EditText) findViewById(R.id.editText8);
textViewtotal = (TextView) findViewById(R.id.editText6);
textViewnet = (TextView) findViewById(R.id.editText8);
textViewproceeds = (TextView) findViewById(R.id.editText7);
textViewprof = (TextView) findViewById(R.id.editText9);
editText1.addTextChangedListener(new TextWatcher() {
public void beforeTextChanged(CharSequence s, int start, int count,
int after) {
// TODO Auto-generated method stub
}
public void onTextChanged(CharSequence s, int start, int before,
int count) {
}
public void afterTextChanged(Editable s) {
// TODO Auto-generated method stub
textViewproceeds.setText(addProceeds());
textViewtotal.setText(addTotal());
}
});
editText2.addTextChangedListener(new TextWatcher() {
public void beforeTextChanged(CharSequence s, int start, int count,
int after) {
// TODO Auto-generated method stub
}
public void onTextChanged(CharSequence s, int start, int before,
int count) {
}
public void afterTextChanged(Editable s) {
// TODO Auto-generated method stub
textViewtotal.setText(addTotal());
}
});
editText3.addTextChangedListener(new TextWatcher() {
public void beforeTextChanged(CharSequence s, int start, int count,
int after) {
// TODO Auto-generated method stub
}
public void onTextChanged(CharSequence s, int start, int before,
int count) {
}
public void afterTextChanged(Editable s) {
// TODO Auto-generated method stub
textViewproceeds.setText(addProceeds());
}
});
editText4.addTextChangedListener(new TextWatcher() {
public void beforeTextChanged(CharSequence s, int start, int count,
int after) {
// TODO Auto-generated method stub
}
public void onTextChanged(CharSequence s, int start, int before,
int count) {
}
public void afterTextChanged(Editable s) {
// TODO Auto-generated method stub
textViewtotal.setText(addTotal());
}
});
editText5.addTextChangedListener(new TextWatcher() {
public void beforeTextChanged(CharSequence s, int start, int count,
int after) {
// TODO Auto-generated method stub
}
public void onTextChanged(CharSequence s, int start, int before,
int count) {
}
public void afterTextChanged(Editable s) {
// TODO Auto-generated method stub
textViewtotal.setText(addTotal());
}
});
editText6.addTextChangedListener(new TextWatcher() {
public void beforeTextChanged(CharSequence s, int start, int count,
int after) {
// TODO Auto-generated method stub
}
public void onTextChanged(CharSequence s, int start, int before,
int count) {
}
public void afterTextChanged(Editable s) {
// TODO Auto-generated method stub
textViewnet.setText(addNet());
textViewprof.setText(addProfpercent());
}
});
editText7.addTextChangedListener(new TextWatcher() {
public void beforeTextChanged(CharSequence s, int start, int count,
int after) {
// TODO Auto-generated method stub
}
public void onTextChanged(CharSequence s, int start, int before,
int count) {
}
public void afterTextChanged(Editable s) {
// TODO Auto-generated method stub
textViewnet.setText(addNet());
}
});
editText8.addTextChangedListener(new TextWatcher() {
public void beforeTextChanged(CharSequence s, int start, int count,
int after) {
// TODO Auto-generated method stub
}
public void onTextChanged(CharSequence s, int start, int before,
int count) {
}
public void afterTextChanged(Editable s) {
// TODO Auto-generated method stub
textViewprof.setText(addProfpercent());
}
});
}
private String addProceeds() {
Double num1;
Double num2;
if(editText1.getText().toString() != "" && editText1.getText().length() > 0) {
num1 = Double.parseDouble(editText1.getText().toString());
} else {
num1 = Double.valueOf(0);
}
if(editText3.getText().toString() != "" && editText3.getText().length() > 0) {
num2 = Double.parseDouble(editText3.getText().toString());
} else {
num2 = Double.valueOf(0);
}
return Double.toString(num1 * num2);
}
private String addTotal() {
Double num1;
Double num2;
Double num3;
Double num4;
if (editText1.getText().toString() != "" && editText1.getText().length() > 0) {
num1 = Double.parseDouble(editText1.getText().toString());
} else {
num1 = Double.valueOf(0);
}
if (editText2.getText().toString() != "" && editText2.getText().length() > 0) {
num2 = Double.parseDouble(editText2.getText().toString());
} else {
num2 = Double.valueOf(0);
}
if (editText4.getText().toString() != "" && editText4.getText().length() > 0) {
num3 = Double.parseDouble(editText4.getText().toString());
} else {
num3 = Double.valueOf(0);
}
if (editText5.getText().toString() != "" && editText5.getText().length() > 0) {
num4 = Double.parseDouble(editText5.getText().toString());
} else {
num4 = Double.valueOf(0);
}
return Double.toString((num1 * num2) + num3 + num4);
}
private String addNet() {
Double num1;
Double num2;
if(editText6.getText().toString() != "" && editText6.getText().length() > 0) {
num1 = Double.parseDouble(editText6.getText().toString());
} else {
num1 = Double.valueOf(0);
}
if(editText7.getText().toString() != "" && editText7.getText().length() > 0) {
num2 = Double.parseDouble(editText7.getText().toString());
} else {
num2 = Double.valueOf(0);
}
return Double.toString(num2 - num1);
}
private String addProfpercent() {
Double num1;
Double num2;
if(editText6.getText().toString() != "" && editText6.getText().length() > 0) {
num1 = Double.parseDouble(editText6.getText().toString());
} else {
num1 = Double.valueOf(0);
}
if(editText8.getText().toString() != "" && editText8.getText().length() > 0) {
num2 = Double.parseDouble(editText8.getText().toString());
} else {
num2 = Double.valueOf(0);
}
return Double.toString((num2 / num1) * 100);
}
这是xml：
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:paddingLeft="@dimen/activity_horizontal_margin"
android:paddingRight="@dimen/activity_horizontal_margin"
android:paddingTop="@dimen/activity_vertical_margin"
android:paddingBottom="@dimen/activity_vertical_margin"
tools:context=".MainActivity">
<TextView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:textAppearance="?android:attr/textAppearanceMedium"
android:text="Number of Shares"
android:id="@+id/textNumShares"
android:layout_alignParentTop="true"
android:layout_alignParentLeft="true"
android:layout_alignParentStart="true"
android:layout_marginTop="50dp" />
<TextView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:textAppearance="?android:attr/textAppearanceMedium"
android:text="Initial Share Price"
android:id="@+id/textInitialPrice"
android:layout_below="@+id/textNumShares"
android:layout_alignParentLeft="true"
android:layout_alignParentStart="true"
android:layout_marginTop="10dp" />
<EditText
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:inputType="number"
android:ems="10"
android:id="@+id/editText1"
android:layout_alignBottom="@+id/textNumShares"
android:layout_alignParentRight="true"
android:layout_alignParentEnd="false"
android:maxLength="8"
android:gravity="right"
android:width="100dp"/>
<EditText
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:inputType="numberDecimal"
android:ems="10"
android:id="@+id/editText2"
android:layout_alignBottom="@+id/textInitialPrice"
android:layout_alignRight="@+id/editText1"
android:layout_alignEnd="@+id/editText1"
android:maxLength="8"
android:gravity="right"
android:width="100dp"/>
<TextView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:textAppearance="?android:attr/textAppearanceMedium"
android:text="Target/Current Share Price"
android:id="@+id/textTargetPrice"
android:layout_below="@+id/textInitialPrice"
android:layout_alignParentLeft="true"
android:layout_alignParentStart="true"
android:layout_marginTop="10dp" />
<EditText
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:inputType="numberDecimal"
android:ems="10"
android:id="@+id/editText3"
android:layout_alignBottom="@+id/textTargetPrice"
android:layout_alignParentRight="true"
android:layout_alignParentEnd="true"
android:maxLength="8"
android:gravity="right"
android:width="100dp"/>
<TextView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:textAppearance="?android:attr/textAppearanceMedium"
android:text="Brokerage Buy Fee(s)"
android:id="@+id/textBuyFee"
android:layout_below="@+id/textTargetPrice"
android:layout_alignParentLeft="true"
android:layout_alignParentStart="true"
android:layout_marginTop="10dp" />
<EditText
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:inputType="numberDecimal"
android:ems="10"
android:id="@+id/editText4"
android:layout_alignBottom="@+id/textBuyFee"
android:layout_alignRight="@+id/editText3"
android:layout_alignEnd="@+id/editText3"
android:maxLength="5"
android:gravity="right"
android:width="100dp"/>
<TextView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:textAppearance="?android:attr/textAppearanceMedium"
android:text="Brokerage Sell Fee(s)"
android:id="@+id/textSellFee"
android:layout_below="@+id/textBuyFee"
android:layout_alignParentLeft="true"
android:layout_alignParentStart="true"
android:layout_marginTop="10dp" />
<EditText
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:inputType="numberDecimal"
android:ems="10"
android:id="@+id/editText5"
android:layout_alignBottom="@+id/textSellFee"
android:layout_alignRight="@+id/editText4"
android:layout_alignEnd="@+id/editText4"
android:maxLength="5"
android:gravity="right"
android:width="100dp"/>
<TextView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:textAppearance="?android:attr/textAppearanceMedium"
android:text="Total Purchase Cost"
android:id="@+id/textTotalCost"
android:layout_below="@+id/textSellFee"
android:layout_alignParentLeft="true"
android:layout_alignParentStart="true"
android:layout_marginTop="10dp" />
<EditText
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:inputType="numberDecimal"
android:ems="10"
android:id="@+id/editText6"
android:layout_alignBottom="@+id/textTotalCost"
android:layout_alignLeft="@+id/editText5"
android:layout_alignStart="@+id/editText5"
android:maxLength="8"
android:gravity="right"
android:width="100dp"
android:editable="false"
android:clickable="false"
android:cursorVisible="false"
android:focusable="false"
android:longClickable="false"/>
<TextView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:textAppearance="?android:attr/textAppearanceMedium"
android:text="Proceeds"
android:id="@+id/textProceeds"
android:layout_below="@+id/textTotalCost"
android:layout_alignParentLeft="true"
android:layout_alignParentStart="true"
android:layout_marginTop="10dp" />
<EditText
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:inputType="numberDecimal"
android:ems="10"
android:id="@+id/editText7"
android:layout_alignBottom="@+id/textProceeds"
android:layout_alignParentRight="true"
android:layout_alignParentEnd="true"
android:maxLength="8"
android:gravity="right"
android:width="100dp"
android:editable="false"
android:clickable="false"
android:cursorVisible="false"
android:focusable="false"
android:longClickable="false"/>
<TextView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:textAppearance="?android:attr/textAppearanceMedium"
android:text="Net Profit"
android:id="@+id/textNetProfit"
android:layout_below="@+id/textProceeds"
android:layout_alignParentLeft="true"
android:layout_alignParentStart="true"
android:layout_marginTop="10dp" />
<EditText
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:inputType="numberDecimal"
android:ems="10"
android:id="@+id/editText8"
android:layout_alignBottom="@+id/textNetProfit"
android:layout_alignParentRight="true"
android:layout_alignParentEnd="true"
android:maxLength="8"
android:gravity="right"
android:width="100dp"
android:editable="false"
android:clickable="false"
android:cursorVisible="false"
android:focusable="false"
android:longClickable="false"/>
<TextView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:textAppearance="?android:attr/textAppearanceMedium"
android:text="Return on Investment"
android:id="@+id/textReturn"
android:layout_below="@+id/textNetProfit"
android:layout_alignParentLeft="true"
android:layout_alignParentStart="true"
android:layout_marginTop="10dp" />
<EditText
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:inputType="numberDecimal"
android:ems="10"
android:id="@+id/editText9"
android:layout_alignBottom="@+id/textReturn"
android:layout_alignParentRight="true"
android:layout_alignParentEnd="true"
android:maxLength="2"
android:gravity="right"
android:width="100dp"
android:editable="false"
android:clickable="false"
android:cursorVisible="false"
android:focusable="false"
android:longClickable="false"/>
<EditText
android:layout_width="wrap_content"
android:inputType="numberDecimal"
android:layout_height="wrap_content"
android:id="@+id/editTest1"
android:layout_alignParentBottom="true"
android:layout_alignParentRight="true"
android:layout_alignParentEnd="true"
android:layout_marginBottom="44dp"
android:width="100dp"/>
</RelativeLayout>
这是logcat
04-05 16:24:42.960 1970-1970/com.example.admin.stockcalcdemo D/AndroidRuntime﹕ Shutting down VM
04-05 16:24:42.960 1970-1970/com.example.admin.stockcalcdemo W/dalvikvm﹕ threadid=1: thread exiting with uncaught exception (group=0xb2fae288)
04-05 16:24:42.960 1970-1970/com.example.admin.stockcalcdemo E/AndroidRuntime﹕ FATAL EXCEPTION: main
java.lang.NumberFormatException: Invalid double: ""
at java.lang.StringToReal.invalidReal(StringToReal.java:63)
at java.lang.StringToReal.initialParse(StringToReal.java:163)
at java.lang.StringToReal.parseDouble(StringToReal.java:263)
at java.lang.Double.parseDouble(Double.java:295)
at com.example.admin.stockcalcdemo.MainActivity.addTotal(MainActivity.java:239)
at com.example.admin.stockcalcdemo.MainActivity.access0(MainActivity.java:16)
at com.example.admin.stockcalcdemo.MainActivity.afterTextChanged(MainActivity.java:88)
at android.widget.TextView.sendAfterTextChanged(TextView.java:7095)
at android.widget.TextView$ChangeWatcher.afterTextChanged(TextView.java:8743)
at android.text.SpannableStringBuilder.sendAfterTextChanged(SpannableStringBuilder.java:970)
at android.text.SpannableStringBuilder.replace(SpannableStringBuilder.java:497)
at android.text.SpannableStringBuilder.replace(SpannableStringBuilder.java:435)
at android.text.SpannableStringBuilder.replace(SpannableStringBuilder.java:30)
at android.view.inputmethod.BaseInputConnection.replaceText(BaseInputConnection.java:672)
at android.view.inputmethod.BaseInputConnection.commitText(BaseInputConnection.java:196)
at com.android.internal.widget.EditableInputConnection.commitText(EditableInputConnection.java:183)
at com.android.internal.view.IInputConnectionWrapper.executeMessage(IInputConnectionWrapper.java:279)
at com.android.internal.view.IInputConnectionWrapper$MyHandler.handleMessage(IInputConnectionWrapper.java:77)
at android.os.Handler.dispatchMessage(Handler.java:99)
at android.os.Looper.loop(Looper.java:137)
at android.app.ActivityThread.main(ActivityThread.java:4745)
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:786)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:553)
at dalvik.system.NativeStart.main(Native Method)
感谢您的帮助。
试试这个，
您必须用“0”插入小数点，而不仅仅是“.”。 .或者您也可以通过添加“0”以编程方式解决此问题。按如下方式更新您的代码，
double num2 = Double.parseDouble("0" + editText2.getText().toString());
对接受小数的所有编辑文本执行相同操作。
我正在创建一个计算器类型的应用程序，它 returns 使用 TextWatcher 函数计算一堆 EditText 字段。我遇到的问题是，当我在数字前输入小数时，我的应用程序崩溃了。这是我目前所拥有的。
public class MainActivity extends ActionBarActivity {
EditText editText1;
EditText editText2;
EditText editText4;
EditText editText3;
EditText editText5;
EditText editText6;
EditText editText7;
EditText editText8;
TextView textViewtotal;
TextView textViewnet;
TextView textViewproceeds;
TextView textViewprof;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
editText1 = (EditText) findViewById(R.id.editText1);
editText2 = (EditText) findViewById(R.id.editText2);
editText3 = (EditText) findViewById(R.id.editText3);
editText4 = (EditText) findViewById(R.id.editText4);
editText5 = (EditText) findViewById(R.id.editText5);
editText6 = (EditText) findViewById(R.id.editText6);
editText7 = (EditText) findViewById(R.id.editText7);
editText8 = (EditText) findViewById(R.id.editText8);
textViewtotal = (TextView) findViewById(R.id.editText6);
textViewnet = (TextView) findViewById(R.id.editText8);
textViewproceeds = (TextView) findViewById(R.id.editText7);
textViewprof = (TextView) findViewById(R.id.editText9);
editText1.addTextChangedListener(new TextWatcher() {
public void beforeTextChanged(CharSequence s, int start, int count,
int after) {
// TODO Auto-generated method stub
}
public void onTextChanged(CharSequence s, int start, int before,
int count) {
}
public void afterTextChanged(Editable s) {
// TODO Auto-generated method stub
textViewproceeds.setText(addProceeds());
textViewtotal.setText(addTotal());
}
});
editText2.addTextChangedListener(new TextWatcher() {
public void beforeTextChanged(CharSequence s, int start, int count,
int after) {
// TODO Auto-generated method stub
}
public void onTextChanged(CharSequence s, int start, int before,
int count) {
}
public void afterTextChanged(Editable s) {
// TODO Auto-generated method stub
textViewtotal.setText(addTotal());
}
});
editText3.addTextChangedListener(new TextWatcher() {
public void beforeTextChanged(CharSequence s, int start, int count,
int after) {
// TODO Auto-generated method stub
}
public void onTextChanged(CharSequence s, int start, int before,
int count) {
}
public void afterTextChanged(Editable s) {
// TODO Auto-generated method stub
textViewproceeds.setText(addProceeds());
}
});
editText4.addTextChangedListener(new TextWatcher() {
public void beforeTextChanged(CharSequence s, int start, int count,
int after) {
// TODO Auto-generated method stub
}
public void onTextChanged(CharSequence s, int start, int before,
int count) {
}
public void afterTextChanged(Editable s) {
// TODO Auto-generated method stub
textViewtotal.setText(addTotal());
}
});
editText5.addTextChangedListener(new TextWatcher() {
public void beforeTextChanged(CharSequence s, int start, int count,
int after) {
// TODO Auto-generated method stub
}
public void onTextChanged(CharSequence s, int start, int before,
int count) {
}
public void afterTextChanged(Editable s) {
// TODO Auto-generated method stub
textViewtotal.setText(addTotal());
}
});
editText6.addTextChangedListener(new TextWatcher() {
public void beforeTextChanged(CharSequence s, int start, int count,
int after) {
// TODO Auto-generated method stub
}
public void onTextChanged(CharSequence s, int start, int before,
int count) {
}
public void afterTextChanged(Editable s) {
// TODO Auto-generated method stub
textViewnet.setText(addNet());
textViewprof.setText(addProfpercent());
}
});
editText7.addTextChangedListener(new TextWatcher() {
public void beforeTextChanged(CharSequence s, int start, int count,
int after) {
// TODO Auto-generated method stub
}
public void onTextChanged(CharSequence s, int start, int before,
int count) {
}
public void afterTextChanged(Editable s) {
// TODO Auto-generated method stub
textViewnet.setText(addNet());
}
});
editText8.addTextChangedListener(new TextWatcher() {
public void beforeTextChanged(CharSequence s, int start, int count,
int after) {
// TODO Auto-generated method stub
}
public void onTextChanged(CharSequence s, int start, int before,
int count) {
}
public void afterTextChanged(Editable s) {
// TODO Auto-generated method stub
textViewprof.setText(addProfpercent());
}
});
}
private String addProceeds() {
Double num1;
Double num2;
if(editText1.getText().toString() != "" && editText1.getText().length() > 0) {
num1 = Double.parseDouble(editText1.getText().toString());
} else {
num1 = Double.valueOf(0);
}
if(editText3.getText().toString() != "" && editText3.getText().length() > 0) {
num2 = Double.parseDouble(editText3.getText().toString());
} else {
num2 = Double.valueOf(0);
}
return Double.toString(num1 * num2);
}
private String addTotal() {
Double num1;
Double num2;
Double num3;
Double num4;
if (editText1.getText().toString() != "" && editText1.getText().length() > 0) {
num1 = Double.parseDouble(editText1.getText().toString());
} else {
num1 = Double.valueOf(0);
}
if (editText2.getText().toString() != "" && editText2.getText().length() > 0) {
num2 = Double.parseDouble(editText2.getText().toString());
} else {
num2 = Double.valueOf(0);
}
if (editText4.getText().toString() != "" && editText4.getText().length() > 0) {
num3 = Double.parseDouble(editText4.getText().toString());
} else {
num3 = Double.valueOf(0);
}
if (editText5.getText().toString() != "" && editText5.getText().length() > 0) {
num4 = Double.parseDouble(editText5.getText().toString());
} else {
num4 = Double.valueOf(0);
}
return Double.toString((num1 * num2) + num3 + num4);
}
private String addNet() {
Double num1;
Double num2;
if(editText6.getText().toString() != "" && editText6.getText().length() > 0) {
num1 = Double.parseDouble(editText6.getText().toString());
} else {
num1 = Double.valueOf(0);
}
if(editText7.getText().toString() != "" && editText7.getText().length() > 0) {
num2 = Double.parseDouble(editText7.getText().toString());
} else {
num2 = Double.valueOf(0);
}
return Double.toString(num2 - num1);
}
private String addProfpercent() {
Double num1;
Double num2;
if(editText6.getText().toString() != "" && editText6.getText().length() > 0) {
num1 = Double.parseDouble(editText6.getText().toString());
} else {
num1 = Double.valueOf(0);
}
if(editText8.getText().toString() != "" && editText8.getText().length() > 0) {
num2 = Double.parseDouble(editText8.getText().toString());
} else {
num2 = Double.valueOf(0);
}
return Double.toString((num2 / num1) * 100);
}
这是xml：
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:paddingLeft="@dimen/activity_horizontal_margin"
android:paddingRight="@dimen/activity_horizontal_margin"
android:paddingTop="@dimen/activity_vertical_margin"
android:paddingBottom="@dimen/activity_vertical_margin"
tools:context=".MainActivity">
<TextView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:textAppearance="?android:attr/textAppearanceMedium"
android:text="Number of Shares"
android:id="@+id/textNumShares"
android:layout_alignParentTop="true"
android:layout_alignParentLeft="true"
android:layout_alignParentStart="true"
android:layout_marginTop="50dp" />
<TextView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:textAppearance="?android:attr/textAppearanceMedium"
android:text="Initial Share Price"
android:id="@+id/textInitialPrice"
android:layout_below="@+id/textNumShares"
android:layout_alignParentLeft="true"
android:layout_alignParentStart="true"
android:layout_marginTop="10dp" />
<EditText
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:inputType="number"
android:ems="10"
android:id="@+id/editText1"
android:layout_alignBottom="@+id/textNumShares"
android:layout_alignParentRight="true"
android:layout_alignParentEnd="false"
android:maxLength="8"
android:gravity="right"
android:width="100dp"/>
<EditText
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:inputType="numberDecimal"
android:ems="10"
android:id="@+id/editText2"
android:layout_alignBottom="@+id/textInitialPrice"
android:layout_alignRight="@+id/editText1"
android:layout_alignEnd="@+id/editText1"
android:maxLength="8"
android:gravity="right"
android:width="100dp"/>
<TextView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:textAppearance="?android:attr/textAppearanceMedium"
android:text="Target/Current Share Price"
android:id="@+id/textTargetPrice"
android:layout_below="@+id/textInitialPrice"
android:layout_alignParentLeft="true"
android:layout_alignParentStart="true"
android:layout_marginTop="10dp" />
<EditText
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:inputType="numberDecimal"
android:ems="10"
android:id="@+id/editText3"
android:layout_alignBottom="@+id/textTargetPrice"
android:layout_alignParentRight="true"
android:layout_alignParentEnd="true"
android:maxLength="8"
android:gravity="right"
android:width="100dp"/>
<TextView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:textAppearance="?android:attr/textAppearanceMedium"
android:text="Brokerage Buy Fee(s)"
android:id="@+id/textBuyFee"
android:layout_below="@+id/textTargetPrice"
android:layout_alignParentLeft="true"
android:layout_alignParentStart="true"
android:layout_marginTop="10dp" />
<EditText
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:inputType="numberDecimal"
android:ems="10"
android:id="@+id/editText4"
android:layout_alignBottom="@+id/textBuyFee"
android:layout_alignRight="@+id/editText3"
android:layout_alignEnd="@+id/editText3"
android:maxLength="5"
android:gravity="right"
android:width="100dp"/>
<TextView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:textAppearance="?android:attr/textAppearanceMedium"
android:text="Brokerage Sell Fee(s)"
android:id="@+id/textSellFee"
android:layout_below="@+id/textBuyFee"
android:layout_alignParentLeft="true"
android:layout_alignParentStart="true"
android:layout_marginTop="10dp" />
<EditText
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:inputType="numberDecimal"
android:ems="10"
android:id="@+id/editText5"
android:layout_alignBottom="@+id/textSellFee"
android:layout_alignRight="@+id/editText4"
android:layout_alignEnd="@+id/editText4"
android:maxLength="5"
android:gravity="right"
android:width="100dp"/>
<TextView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:textAppearance="?android:attr/textAppearanceMedium"
android:text="Total Purchase Cost"
android:id="@+id/textTotalCost"
android:layout_below="@+id/textSellFee"
android:layout_alignParentLeft="true"
android:layout_alignParentStart="true"
android:layout_marginTop="10dp" />
<EditText
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:inputType="numberDecimal"
android:ems="10"
android:id="@+id/editText6"
android:layout_alignBottom="@+id/textTotalCost"
android:layout_alignLeft="@+id/editText5"
android:layout_alignStart="@+id/editText5"
android:maxLength="8"
android:gravity="right"
android:width="100dp"
android:editable="false"
android:clickable="false"
android:cursorVisible="false"
android:focusable="false"
android:longClickable="false"/>
<TextView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:textAppearance="?android:attr/textAppearanceMedium"
android:text="Proceeds"
android:id="@+id/textProceeds"
android:layout_below="@+id/textTotalCost"
android:layout_alignParentLeft="true"
android:layout_alignParentStart="true"
android:layout_marginTop="10dp" />
<EditText
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:inputType="numberDecimal"
android:ems="10"
android:id="@+id/editText7"
android:layout_alignBottom="@+id/textProceeds"
android:layout_alignParentRight="true"
android:layout_alignParentEnd="true"
android:maxLength="8"
android:gravity="right"
android:width="100dp"
android:editable="false"
android:clickable="false"
android:cursorVisible="false"
android:focusable="false"
android:longClickable="false"/>
<TextView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:textAppearance="?android:attr/textAppearanceMedium"
android:text="Net Profit"
android:id="@+id/textNetProfit"
android:layout_below="@+id/textProceeds"
android:layout_alignParentLeft="true"
android:layout_alignParentStart="true"
android:layout_marginTop="10dp" />
<EditText
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:inputType="numberDecimal"
android:ems="10"
android:id="@+id/editText8"
android:layout_alignBottom="@+id/textNetProfit"
android:layout_alignParentRight="true"
android:layout_alignParentEnd="true"
android:maxLength="8"
android:gravity="right"
android:width="100dp"
android:editable="false"
android:clickable="false"
android:cursorVisible="false"
android:focusable="false"
android:longClickable="false"/>
<TextView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:textAppearance="?android:attr/textAppearanceMedium"
android:text="Return on Investment"
android:id="@+id/textReturn"
android:layout_below="@+id/textNetProfit"
android:layout_alignParentLeft="true"
android:layout_alignParentStart="true"
android:layout_marginTop="10dp" />
<EditText
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:inputType="numberDecimal"
android:ems="10"
android:id="@+id/editText9"
android:layout_alignBottom="@+id/textReturn"
android:layout_alignParentRight="true"
android:layout_alignParentEnd="true"
android:maxLength="2"
android:gravity="right"
android:width="100dp"
android:editable="false"
android:clickable="false"
android:cursorVisible="false"
android:focusable="false"
android:longClickable="false"/>
<EditText
android:layout_width="wrap_content"
android:inputType="numberDecimal"
android:layout_height="wrap_content"
android:id="@+id/editTest1"
android:layout_alignParentBottom="true"
android:layout_alignParentRight="true"
android:layout_alignParentEnd="true"
android:layout_marginBottom="44dp"
android:width="100dp"/>
</RelativeLayout>
这是logcat
04-05 16:24:42.960 1970-1970/com.example.admin.stockcalcdemo D/AndroidRuntime﹕ Shutting down VM 04-05 16:24:42.960 1970-1970/com.example.admin.stockcalcdemo W/dalvikvm﹕ threadid=1: thread exiting with uncaught exception (group=0xb2fae288) 04-05 16:24:42.960 1970-1970/com.example.admin.stockcalcdemo E/AndroidRuntime﹕ FATAL EXCEPTION: main java.lang.NumberFormatException: Invalid double: "" at java.lang.StringToReal.invalidReal(StringToReal.java:63) at java.lang.StringToReal.initialParse(StringToReal.java:163) at java.lang.StringToReal.parseDouble(StringToReal.java:263) at java.lang.Double.parseDouble(Double.java:295) at com.example.admin.stockcalcdemo.MainActivity.addTotal(MainActivity.java:239) at com.example.admin.stockcalcdemo.MainActivity.access0(MainActivity.java:16) at com.example.admin.stockcalcdemo.MainActivity.afterTextChanged(MainActivity.java:88) at android.widget.TextView.sendAfterTextChanged(TextView.java:7095) at android.widget.TextView$ChangeWatcher.afterTextChanged(TextView.java:8743) at android.text.SpannableStringBuilder.sendAfterTextChanged(SpannableStringBuilder.java:970) at android.text.SpannableStringBuilder.replace(SpannableStringBuilder.java:497) at android.text.SpannableStringBuilder.replace(SpannableStringBuilder.java:435) at android.text.SpannableStringBuilder.replace(SpannableStringBuilder.java:30) at android.view.inputmethod.BaseInputConnection.replaceText(BaseInputConnection.java:672) at android.view.inputmethod.BaseInputConnection.commitText(BaseInputConnection.java:196) at com.android.internal.widget.EditableInputConnection.commitText(EditableInputConnection.java:183) at com.android.internal.view.IInputConnectionWrapper.executeMessage(IInputConnectionWrapper.java:279) at com.android.internal.view.IInputConnectionWrapper$MyHandler.handleMessage(IInputConnectionWrapper.java:77) at android.os.Handler.dispatchMessage(Handler.java:99) at android.os.Looper.loop(Looper.java:137) at android.app.ActivityThread.main(ActivityThread.java:4745) at java.lang.reflect.Method.invokeNative(Native Method) at java.lang.reflect.Method.invoke(Method.java:511) at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:786) at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:553) at dalvik.system.NativeStart.main(Native Method)
感谢您的帮助。
试试这个，
您必须用“0”插入小数点，而不仅仅是“.”。 .或者您也可以通过添加“0”以编程方式解决此问题。按如下方式更新您的代码，
double num2 = Double.parseDouble("0" + editText2.getText().toString());
对接受小数的所有编辑文本执行相同操作。