我想不断更新应用程序中的信息

Question

基本上，我有一个由片段组成的导航栏活动，并且我正在制作一个单位转换器。我已经清楚了如何做到这一点的概念，只有一个简单的问题。由于我使用的是单选按钮，因此每次更改要转换为相同单位转换的值时，我都需要单击不同的单选按钮，然后单击返回相同的单选按钮

final RadioGroup radioGroup = (RadioGroup) myView.findViewById(R.id.radio);
    radioGroup.setOnCheckedChangeListener(new OnCheckedChangeListener() {
        @Override
        public void onCheckedChanged(RadioGroup group, final int checkedId) {
            // checkedId is the RadioButton selected
            switch (checkedId) {
                case R.id.radioGram:
                    final TextView textView = (TextView) myView.findViewById(R.id.EditTextFrom);
                    textView.setText("Gram");

                    final RadioGroup radioGroup = (RadioGroup) myView.findViewById(R.id.radio2);
                    radioGroup.setOnCheckedChangeListener(new OnCheckedChangeListener() {
                        @Override
                        public void onCheckedChanged(RadioGroup radioGroup, int checkedId2) {
                            switch (checkedId2) {
                                case R.id.radioGram2:
                                    TextView textView = (TextView) myView.findViewById(R.id.EditTextTo);
                                    textView.setText("Gram");

                                    EditText calc = (EditText) myView.findViewById(R.id.From);
                                    String gramholder = calc.getText().toString();
                                    gram = Integer.parseInt(gramholder) * 1;

                                    EditText editText = (EditText) myView.findViewById(R.id.To);
                                    editText.setText(String.valueOf(gram));
                                    break;

                                case R.id.radioKilogram2:
                                    TextView textView2 = (TextView) myView.findViewById(R.id.EditTextTo);
                                    textView2.setText("Kilogram");

                                    EditText calc2 = (EditText) myView.findViewById(R.id.From);
                                    String gramholder2 = calc2.getText().toString();
                                    gram2 = Integer.parseInt(gramholder2) * 0.001;

                                    EditText editText2 = (EditText) myView.findViewById(R.id.To);
                                    editText2.setText(String.valueOf(gram2));
                                    break;


                            }

                        }


                    });

例如，如果我想将 500 克转换为千克，我只需单击单选按钮克（在第一个单选组中）和千克（在第二个单选组中），但是如果我想转换 520 克到公斤，我需要点击克，然后在第二个无线电组中回到公斤

Answer 1

发生这种情况是因为您通过仅侦听单选按钮的 CheckedChangeListener 来更改 editText 的值。

您只需将TextChangeListener 添加到您的editText 并使用TextWatcher 来监听更改。

然后，您将不需要再次单击单选按钮。

编辑：编写此代码。没测试过，但大概理解解决方案就够了。

import android.app.Activity;
import android.os.Bundle;
import android.text.Editable;
import android.text.TextWatcher;
import android.view.View;
import android.widget.EditText;
import android.widget.RadioGroup;
import android.widget.TextView;

/**
 * Created by Kartik Sharma on 01/01/17.
 */
public class Stack extends Activity implements RadioGroup.OnCheckedChangeListener{

    EditText editText_From, editText_To; 
    RadioGroup radioGroup_From, radioGroup_To; 
    View myView;
    private final String GRAM = "GRAM", KILOGRAM = "KILOGRAM";
    String currentSelectedFrom = GRAM, currentSelectedTo = GRAM;


    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        myView = findViewById(R.id.fragment);

        editText_From = (EditText) myView.findViewById(R.id.From);
        editText_To = (EditText) myView.findViewById(R.id.To);


        radioGroup_From = (RadioGroup) findViewById(R.id.radio);
        radioGroup_To = (RadioGroup) myView.findViewById(R.id.radio2);

        editText_From.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) {
                if(currentSelectedTo == KILOGRAM){
                    double gram2 = Integer.parseInt(s.toString()) * 0.001;

                    editText_To.setText(String.valueOf(gram2));
                }else if(currentSelectedTo == GRAM){
                    double gram = Integer.parseInt(s.toString()) * 1;

                    editText_To.setText(String.valueOf(gram));
                }
            }

            @Override
            public void afterTextChanged(Editable s) {

            }
        });
        //SIMILARLY FOR EDITTEXT_TO IF REVERSE CALCULATION IS NEEDED
        radioGroup_From.setOnCheckedChangeListener(this);
        radioGroup_To.setOnCheckedChangeListener(this);


    }

    @Override
    public void onCheckedChanged(RadioGroup group, int checkedId) {
        if(group == radioGroup_From){
            switch(checkedId){
                case R.id.radioGram :
                    //PERSON SELECTED GRAM IN FROM SECTION

                    final TextView textView = (TextView) myView.findViewById(R.id.EditTextFrom);
                    textView.setText("Gram");

                    currentSelectedFrom = GRAM;
                    break;
            }
        }else if(group == radioGroup_To){
            switch (checkedId) {
                case R.id.radioGram2:
                    //PERSON SELECTED GRAM IN TO SECTION
                    TextView textView = (TextView) myView.findViewById(R.id.EditTextTo);
                    textView.setText("Gram");

                    String gramholder = editText_From.getText().toString();
                    double gram = Integer.parseInt(gramholder) * 1;

                    editText_To.setText(String.valueOf(gram));

                    currentSelectedTo = GRAM;
                    break;

                case R.id.radioKilogram2:
                    //PERSON SELECTED KILOGRAM IN TO SECTION

                    TextView textView2 = (TextView) myView.findViewById(R.id.EditTextTo);
                    textView2.setText("Kilogram");

                    String gramholder2 = editText_From.getText().toString();
                    double gram2 = Integer.parseInt(gramholder2) * 0.001;

                    editText_To.setText(String.valueOf(gram2));

                    currentSelectedTo = KILOGRAM;
                    break;


            }

        }
    }

}