android - 两个编辑文本上的 TextWatcher

Question

我有两个编辑文本，我想在编辑另一个文本的同时更改一个文本，反之亦然。我使用了 TextWatcher，它或多或少是这样的:

 //MUDAR AO DIGITAR
        edt1.addTextChangedListener(new TextWatcher(){
            @Override
            public void onTextChanged(CharSequence s, int start, int before, int count) {
                //quando o texto é alterado chamamos o filtro.
                double valor = (s.length()>0)?Double.parseDouble(s.toString()):0;
                valor = (valor * 100);
                edt2.setText(valor);
            }
            @Override
            public void beforeTextChanged(CharSequence s, int start, int count,int after) {}
            @Override
            public void afterTextChanged(Editable s) {}
        });

        edt2.addTextChangedListener(new TextWatcher(){
            @Override
            public void onTextChanged(CharSequence s, int start, int before, int count) {
                double valor = (s.length()>0)?Double.parseDouble(s.toString()):0;
                valor = (valor / 100);
                edt1.setText(valor);
            }
            @Override
            public void beforeTextChanged(CharSequence s, int start, int count,int after) {}
            @Override
            public void afterTextChanged(Editable s) {}
        });

但是这个代码不起作用，只能用一个，我需要两个

Answer 1

由于您已在编辑文本和两个回调事件 (onTextChangeListener) 上设置文本更改监听器，因此它将是无限迭代。它将继续在一侧的编辑文本上设置文本，并且回调将继续调用。因此这个循环将一直运行直到应用程序崩溃。编辑要实现您想要的，请参阅下面的详细信息

您需要跟踪当前关注的编辑文本(这是为了在编辑文本中设置文本)。您需要有 2 个 bool 变量。现在看下面的代码

public class MainActivity extends AppCompatActivity {

EditText edt1, edt2;
boolean et1Focus, et2Focus;

@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_main);

    edt1 = findViewById(R.id.et1);
    edt2 = findViewById(R.id.et2);

            edt1.addTextChangedListener(new TextWatcher() {
        @Override
        public void onTextChanged(CharSequence s, int start, int before, int count) {
            //quando o texto é alterado chamamos o filtro.
            if (et1Focus) {
                double valor = (s.length() > 0) ? Double.parseDouble(s.toString()) : 0;
                valor = (valor * 100);
                edt2.setText(String.valueOf(valor));
            }
        }

        @Override
        public void beforeTextChanged(CharSequence s, int start, int count, int after) {
        }

        @Override
        public void afterTextChanged(Editable s) {
        }
    });

    edt2.addTextChangedListener(new TextWatcher() {
        @Override
        public void onTextChanged(CharSequence s, int start, int before, int count) {
            if (et2Focus) {
                double valor = (s.length() > 0) ? Double.parseDouble(s.toString()) : 0;
                valor = (valor / 100);
                edt1.setText(String.valueOf(valor));
            }
        }

        @Override
        public void beforeTextChanged(CharSequence s, int start, int count, int after) {
        }

        @Override
        public void afterTextChanged(Editable s) {
        }
    });

    edt1.setOnFocusChangeListener(new View.OnFocusChangeListener() {
        @Override
        public void onFocusChange(View view, boolean b) {
            et1Focus = b;
        }
    });

    edt2.setOnFocusChangeListener(new View.OnFocusChangeListener() {
        @Override
        public void onFocusChange(View view, boolean b) {
            et2Focus = b;
        }
    });
}

希望对您有所帮助..如果您有任何问题，请随时提问