我也很新Android。我尝试开发一个Android应用程序来获取用户输入项的总量。这是我的申请草图。enter image description here
用户必须输入First Row Col1和Col 2.但是First Row Col3可以输入或不输入。在Sub 1 textview中，应显示First Row的总值。此值还应显示在结果文本视图中。同样，如果用户将数据插入第二行，则值必须在Col1和Col2下输入。如果用户喜欢，可以在Col 3下输入值。第二行总值应显示在Sub 2 textview中。如果用户输入值到第二行，则结果文本视图应自动更新为Sub 1和Sub 2 textviews的总值。我尝试按照以下方式执行此操作，但我找不到正确的方法来执行此操作。如果有人帮助我解决这个问题，我真的很感激。 这是java类
public class AddTwo extends AppCompatActivity {
EditText edit1, edit2, edit3;
EditText edit4, edit5, edit6;
TextView textViewSub1, textViewSub2, textViewResult;
/**
* Called when the activity is first created.
*/
@Override
public void onCreate(Bundle icicle) {
super.onCreate(icicle);
setContentView(R.layout.activity_add_two);
/*First row variables*/
edit1 = (EditText) findViewById(R.id.editText1);
edit2 = (EditText) findViewById(R.id.editText2);
edit3 = (EditText) findViewById(R.id.editText3);
textViewSub1 = (TextView) findViewById(R.id.TextViewsub1);
/*Second row variables*/
edit4 = (EditText) findViewById(R.id.editText5);
edit5 = (EditText) findViewById(R.id.editText6);
edit6 = (EditText) findViewById(R.id.editText7);
textViewSub2 = (TextView) findViewById(R.id.TextViewsub2);
/*Final Total TextView variable*/
textViewResult = (TextView) findViewById(R.id.textView_result);
//use TextWatcher for edit1 in First Row Col1
edit1.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) {
//textViewResult.setText(addNumbers());
}
public void afterTextChanged(Editable s) {
// TODO Auto-generated method stub
}
});
//use TextWatcher for first First Row Col2
edit2.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
//textViewResult.setText(addNumbers());
}
});
//use TextWatcher for first First Row Col3
edit3.addTextChangedListener(new TextWatcher() {
@Override
public void beforeTextChanged(CharSequence s, int start, int count, int after) {
}
@Override
public void onTextChanged(CharSequence s, int start, int before, int count) {
}
@Override
public void afterTextChanged(Editable editable) {
textViewResult.setText(addNumbers());
}
});
}
//Define method addString()
private String addNumbers() {
//declaring variables
int number1, number2;
double num1, num2;
double d1, d2;
double da1, da2;
Double orderTotal1 = null, orderTotal2 = null;
Double ordTot1 = null, ordTot2 = null;
DecimalFormat df = new DecimalFormat("0.00##");
//For First Row
/*if only the first and second edittext fields in First Row is filled*/
if ((edit1.getText().toString() != "" && edit1.getText().length() > 0) && (edit2.getText().toString() != "" && edit2.getText().length() > 0)) {
num1 = Double.parseDouble((edit1.getText().toString()));
number1 = Integer.parseInt(edit2.getText().toString());
ordTot1 = num1 * number1;
textViewSub1.setText(df.format(ordTot1));
/*else if the first,secondn third (all) edittext fields in First Row is filled*/
} else if ((edit1.getText().toString() != "" && edit1.getText().length() > 0) && (edit2.getText().toString() != "" && edit2.getText().length() > 0) && (edit3.getText().toString() != "" && edit3.getText().length() > 0)) {
num1 = Double.parseDouble((edit1.getText().toString()));
number1 = Integer.parseInt(edit2.getText().toString());
d1 = Double.parseDouble(edit3.getText().toString());
da1 = 100 - d1;
orderTotal1 = ((da1 * number1) * num1) / 100;
textViewSub1.setText(df.format(orderTotal1));
} else {
number1 = (int) 0.00;
num1 = 0.00;
da1 = 0.00;
}
//For the Second Row
/*if only the first and second edittext fields in Second Row is filled*/
if ((edit4.getText().toString() != "" && edit4.getText().length() > 0) && (edit5.getText().toString() != "" && edit5.getText().length() > 0)) {
num2 = Double.parseDouble((edit4.getText().toString()));
number2 = Integer.parseInt(edit5.getText().toString());
ordTot2 = num2 * number2;
textViewSub2.setText(df.format(ordTot2));
/*else if the first,secondn third (all) edittext fields in Second Row is filled*/
} else if ((edit4.getText().toString() != "" && edit4.getText().length() > 0) && (edit5.getText().toString() != "" && edit5.getText().length() > 0) && (edit6.getText().toString() != "" && edit6.getText().length() > 0)) {
num2 = Double.parseDouble((edit1.getText().toString()));
number2 = Integer.parseInt(edit2.getText().toString());
d2 = Double.parseDouble(edit3.getText().toString());
da2 = 100 - d2;
orderTotal2 = ((da2 * number2) * num2) / 100;
textViewSub2.setText(df.format(orderTotal2));
} else {
number2 = (int) 0.00;
num2 = 0.00;
da2 = 0.00;
}
//return statement
return df.format((orderTotal1) + (orderTotal2));
}
}
答案 0 :(得分：3)
希望得到这个帮助。
/**
* Called when the activity is first created.
*/
@Override
public void onCreate(Bundle icicle) {
super.onCreate(icicle);
setContentView(R.layout.activity_add_two);
/*First row variables*/
edit1 = (EditText) findViewById(R.id.editText1);
edit2 = (EditText) findViewById(R.id.editText2);
edit3 = (EditText) findViewById(R.id.editText3);
textViewSub1 = (TextView) findViewById(R.id.TextViewsub1);
/*Second row variables*/
edit4 = (EditText) findViewById(R.id.editText5);
edit5 = (EditText) findViewById(R.id.editText6);
edit6 = (EditText) findViewById(R.id.editText7);
textViewSub2 = (TextView) findViewById(R.id.TextViewsub2);
/*Final Total TextView variable*/
textViewResult = (TextView) findViewById(R.id.textView_result);
edit1.addTextChangedListener(new LashCustomTextWatcher());
edit2.addTextChangedListener(new LashCustomTextWatcher());
edit3.addTextChangedListener(new LashCustomTextWatcher());
edit4.addTextChangedListener(new LashCustomTextWatcher());
edit5.addTextChangedListener(new LashCustomTextWatcher());
edit6.addTextChangedListener(new LashCustomTextWatcher());
}
public class LashCustomTextWatcher implements TextWatcher{
@Override
public void beforeTextChanged(CharSequence charSequence, int i, int i1, int i2) {
}
@Override
public void onTextChanged(CharSequence charSequence, int i, int i1, int i2) {
textViewResult.setText(lashCalculate());
}
@Override
public void afterTextChanged(Editable editable) {
}
}
public String lashCalculate(){
//declaring variables
double row1_value = 0;
double row2_value = 0;
DecimalFormat df = new DecimalFormat("0.00##");
//calculate first row
if (!edit1.getText().toString().equals("") && !edit2.getText().toString().equals("")){
double num1 = Double.parseDouble((edit1.getText().toString()));
double num2 = Double.parseDouble((edit2.getText().toString()));
row1_value = num1*num2;
double num3 = 0;
if (!edit3.getText().toString().equals("")){
num3 = Double.parseDouble((edit3.getText().toString()));
row1_value = (((100 - num3) * num2) * num1)/100;
}
textViewSub1.setText(df.format(row1_value));
}
//calculate second row
if (!edit4.getText().toString().equals("") && !edit5.getText().toString().equals("")){
double num4 = Double.parseDouble((edit4.getText().toString()));
double num5 = Double.parseDouble((edit5.getText().toString()));
row2_value = num4*num5;
double num6 = 0;
if (!edit6.getText().toString().equals("")){
num6 = Double.parseDouble((edit6.getText().toString()));
row2_value = (((100 - num6) * num5) * num4)/100;
}
textViewSub2.setText(df.format(row2_value));
}
return df.format(row1_value + row2_value);
}
答案 1 :(得分：0)
这是textWatcher Metod
....
public EditText edit1 ,edit2 ,edit3;
public void onCreate(Bundle savedInstanceState) {
.....
edit1 = (EditText) findViewById(R.id.editText1);
edit2 = (EditText) findViewById(R.id.editText2);
edit3 = (EditText) findViewById(R.id.editText3);
edit1.addTextChangedListener(textWatcher());
edit2.addTextChangedListener(textWatcher());
edit3.addTextChangedListener(textWatcher());
......
public TextWatcher textWatcher() {
return new TextWatcher() {
CountDownTimer timer = null;
@Override
public void afterTextChanged(Editable s) {
//do some thigs
}
@Override
public void beforeTextChanged(CharSequence s, int start, int count, int after) {
//do some thigs
}
@Override
public void onTextChanged(CharSequence s, int start, int before, int count) {
//do some thigs
}
};
}