将文本视图中的字符串转换为android中的double

Question

有人可以帮我解决我遇到的这个问题吗？我正在尝试从文本视图中获取一个数字并将其存储到一个 double 中以进行计算。有人可以帮我解决我哪里出错了吗？

 @Override
protected void onStart() {
    super.onStart();
    mRef.addListenerForSingleValueEvent(new ValueEventListener() {
        @Override
        public void onDataChange(DataSnapshot dataSnapshot) {
            for (DataSnapshot snapshot : dataSnapshot.getChildren()) {
                total += Float.parseFloat((String) snapshot.child("totalCost").getValue());
                totalNew.setText(String.valueOf(total).toString().trim());
            }
        }
        @Override
        public void onCancelled(DatabaseError databaseError) {
        }
    });
    mnewRef.addValueEventListener(new ValueEventListener() {
        @Override
        public void onDataChange(DataSnapshot dataSnapshot) {

            Long role = (Long) dataSnapshot.child("barberPercentage").getValue();

            percentage.setText(String.valueOf(role));



            num1 = Double.parseDouble(totalNew.getText().toString().trim());
            num2 = Double.parseDouble(percentage.getText().toString());
            sum = num1  *(num2/100);

            wage.setText(Double.toString(sum));

我收到了一个错误，我尝试了很多方法将 float 更改为 double ，反之亦然，但还没有工作。

java.lang.NumberFormatException: For input string: "Number"
                                                            at java.lang.FloatingDecimal.readJavaFormatString(FloatingDecimal.java:1306)
                                                            at java.lang.Double.parseDouble(Double.java:547)
                                                            at com.starcutz.employer.AdminIndividualBarberWageActivity$2.onDataChange(AdminIndividualBarberWageActivity.java:90)
                                                            at com.google.android.gms.internal.zzbpx.zza(Unknown Source)
                                                            at com.google.android.gms.internal.zzbqx.zzZS(Unknown Source)
                                                            at com.google.android.gms.internal.zzbra$1.run(Unknown Source)
                                                            at android.os.Handler.handleCallback(Handler.java:751)
                                                            at android.os.Handler.dispatchMessage(Handler.java:95)
                                                            at android.os.Looper.loop(Looper.java:154)
                                                            at android.app.ActivityThread.main(ActivityThread.java:6119)
                                                            at java.lang.reflect.Method.invoke(Native Method)
                                                            at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:886)
                                                            at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:776)

我该怎么办？当我删除这些值时，会填充 totalNew Textview 和百分比 Textview。

 num1 = Double.parseDouble(totalNew.getText().toString().trim()); num2 = Double.parseDouble(percentage.getText().toString()); sum = num1 *(num2/100); wage.setText(Double.toString(sum)); 

Answer 1

试试这个

num1 = Double.parseDouble(totalNew.getText().toString());

或者

num1 = Double.valueOf(totalNew.getText().toString());