我正在制作一个 OTPActivity并且需要实现删除功能，我有以下功能应该被onKey退格按钮触发。我的想法是我可以getCurrentFocus用来知道当前正在填充哪些字段，然后requestFocus用来选择之前的字段，但它似乎不起作用，我有另一个功能goToNext可以正常工作，所以我很困惑为什么。我正在读取字节如下： try(FileInputStream f = new FileInputStream("nameOfFile")){ int readByte = 0; int mask =0b111; while((readByte=f.read())!=-1) { System.out.println(Integer.toBinaryString(readByte & mask)); } } catch (FileNotFoundException e) { // TODO Auto-generated catch block e.printStackTrace(); } catch (IOException e) { // TODO Auto-generated catch block e.printStackTrace(); }但是，当我尝试获取构成数字的 8 位时，有时我会得到 7 位甚至比 8 位更多的位。有人可以帮我解决这个问题吗？我想获得 8 位，以便之后我可以查看前 3 位。我需要它来返回此方法中的字符集。 public void goToPrevious() { EditText currentFocus = (EditText) getCurrentFocus(); if (currentFocus == otpOne) { return; } if (currentFocus == otpTwo) { otpOne.requestFocus(); return; } if (currentFocus == otpThree) { otpTwo.requestFocus(); return; } if (currentFocus == otpFour) { otpThree.requestFocus(); return; }}下面是goToNext工作正常的代码。public void goToNext() { EditText currentFocus = (EditText) getCurrentFocus(); if (currentFocus == otpOne) { otpTwo.requestFocus(); return; } if (currentFocus == otpTwo) { otpThree.requestFocus(); return; } if (currentFocus == otpThree) { otpFour.requestFocus(); return; } if (currentFocus == otpFour) { return; }}
2 回答
慕桂英546537
TA贡献1848条经验 获得超10个赞
由于某些非常奇怪的原因，处理程序内部的值与不同，我必须通过将 的值getCurrentFocus直接传递给它来修复它，下面是我最终得到的代码。goToPreviousgetCurrentFocusonKeygoToPrevious
public void goToNext(EditText currentFocus) {
if (currentFocus == otpOne) {
otpTwo.requestFocus();
return;
}
if (currentFocus == otpTwo) {
otpThree.requestFocus();
return;
}
if (currentFocus == otpThree) {
otpFour.requestFocus();
return;
}
if (currentFocus == otpFour) {
return;
}
}
public void goToPrevious(EditText currentFocus) {
if (currentFocus == otpOne) {
return;
}
if (currentFocus == otpTwo) {
otpOne.requestFocus();
return;
}
if (currentFocus == otpThree) {
otpTwo.requestFocus();
return;
}
if (currentFocus == otpFour) {
otpThree.requestFocus();
return;
}
}
@Override
public boolean onKey(View v, int keyCode, KeyEvent event) {
Log.i("ENOUGH", "onKey: " + keyCode + " " + event.getAction() + " " + KeyEvent.KEYCODE_DEL);
if (event.getAction() == KeyEvent.ACTION_DOWN) {
EditText currentFocus = (EditText) getCurrentFocus();
switch (event.getKeyCode()) {
case KeyEvent.KEYCODE_DEL: {
if (currentFocus.getText().length() > 0) {
currentFocus.setText(null);
} else {
goToPrevious(currentFocus);
EditText focused = (EditText) getCurrentFocus();
focused.setText(null);
}
return false;
}
case KeyEvent.KEYCODE_FORWARD:
return true;
case KeyEvent.KEYCODE_BACK:
return true;
case KeyEvent.KEYCODE_ENTER:
return true;
default: {
currentFocus.setText("");
goToNext(currentFocus);
}
}
}
return false;
}
侃侃尔雅
TA贡献1801条经验 获得超16个赞
您可以像下面这样使用：
et1.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 s) {
if(s.length()==1)
{
et2.requestFocus();
}
else if(s.length()==0)
{
et1.clearFocus();
}
}
});
et2.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 s) {
if(s.length()==1)
{
et3.requestFocus();
}
else if(s.length()==0)
{
et1.requestFocus();
}
}
});
et3.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 s) {
if(s.length()==1)
{
et4.requestFocus();
}
else if(s.length()==0)
{
et2.requestFocus();
}
}
});
et4.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 s) {
if(s.length()==1)
{
et5.requestFocus();
}
else if(s.length()==0)
{
et3.requestFocus();
}
}
});
et5.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 s) {
if(s.length()==1)
{
et6.requestFocus();
}
else if(s.length()==0)
{
et4.requestFocus();
}
}
});
et6.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 s) {
if(s.length()==1)
{
et6.clearFocus();
}
else if(s.length()==0)
{
et5.requestFocus();
}
}
});
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