具有2个EditText字段的java文本更改侦听器
在我的项目中,我有两个带有文本更改侦听器的EditText字段
final EditText Field1 = (EditText) findViewById(R.id.Field1);
final EditText Field2 = (EditText) findViewById(R.id.Field2);
Field1.addTextChangedListener(new TextWatcher() {
@Override
public void afterTextChanged(Editable s) {}
@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(Field1.getText().toString().equals("")){
}
else{
double number1 = Double.valueOf(Field1.getText().toString());
double number2 = Math.round((number1 * 10) / 25);
Field2.setText(String.valueOf(number2));
}
}
});
Field2.addTextChangedListener(new TextWatcher() {
@Override
public void afterTextChanged(Editable s) {}
@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(Field2.getText().toString().equals("")){
}
else{
}
}
});
当我在字段1中输入一个数字时,它在字段2中出现,这很好。但是当我把这个代码放在Field2中时:
if(Field2.getText().toString().equals("")){
}
else{
double number2 = Double.valueOf(Field2.getText().toString());
double number1 = Math.round((number2 * 20) / 35);
Field1.setText(String.valueOf(number1));
}
我在Field2中输入了一个数字,应用程序崩溃了。 堆栈跟踪:
31972-31972/arkstudioapps.textchangelistener E/AndroidRuntime﹕ FATAL EXCEPTION: main
Process: arkstudioapps.textchangelistener, PID: 31972
java.lang.StackOverflowError
at 安卓.text.MeasuredText.addStyleRun(MeasuredText.java:164)
at 安卓.text.MeasuredText.addStyleRun(MeasuredText.java:204)
at 安卓.text.StaticLayout.generate(StaticLayout.java:281)
at 安卓.text.DynamicLayout.reflow(DynamicLayout.java:284)
at 安卓.text.DynamicLayout.<init>(DynamicLayout.java:170)
at 安卓.widget.TextView.makeSingleLayout(TextView.java:6134)
at 安卓.widget.TextView.makeNewLayout(TextView.java:6032)
at 安卓.widget.TextView.checkForRelayout(TextView.java:6571)
at 安卓.widget.TextView.setText(TextView.java:3813)
at 安卓.widget.TextView.setText(TextView.java:3671)
at 安卓.widget.EditText.setText(EditText.java:80)
at 安卓.widget.TextView.setText(TextView.java:3646)
at arkstudioapps.textchangelistener.MainActivity$1.onTextChanged(MainActivity.java:38)
at 安卓.widget.TextView.sendOnTextChanged(TextView.java:7408)
at 安卓.widget.TextView.setText(TextView.java:3816)
at 安卓.widget.TextView.setText(TextView.java:3671)
at 安卓.widget.EditText.setText(EditText.java:80)
at 安卓.widget.TextView.setText(TextView.java:3646)
at arkstudioapps.textchangelistener.MainActivity$2.onTextChanged(MainActivity.java:62)
at 安卓.widget.TextView.sendOnTextChanged(TextView.java:7408)
at 安卓.widget.TextView.setText(TextView.java:3816)
at 安卓.widget.TextView.setText(TextView.java:3671)
at 安卓.widget.EditText.setText(EditText.java:80)
at 安卓.widget.TextView.setText(TextView.java:3646)
at arkstudioapps.textchangelistener.MainActivity$1.onTextChanged(MainActivity.java:38)
at 安卓.widget.TextView.sendOnTextChanged(TextView.java:7408)
at 安卓.widget.TextView.setText(TextView.java:3816)
at 安卓.widget.TextView.setText(TextView.java:3671)
at 安卓.widget.EditText.setText(EditText.java:80)
at 安卓.widget.TextView.setText(TextView.java:3646)
at arkstudioapps.textchangelistener.MainActivity$2.onTextChanged(MainActivity.java:62)
at 安卓.widget.TextView.sendOnTextChanged(TextView.java:7408)
at 安卓.widget.TextView.setText(TextView.java:3816)
at 安卓.widget.TextView.setText(TextView.java:3671)
at 安卓.widget.EditText.setText(EditText.java:80)
at 安卓.widget.TextView.setText(TextView.java:3646)
at arkstudioapps.textchangelistener.MainActivity$1.onTextChanged(MainActivity.java:38)
at 安卓.widget.TextView.sendOnTextChanged(TextView.java:7408)
at 安卓.widget.TextView.setText(TextView.java:3816)
at 安卓.widget.TextView.setText(TextView.java:3671)
at 安卓.widget.EditText.setText(EditText.java:80)
at 安卓.widget.TextView.setText(TextView.java:3646)
at arkstudioapps.textchangelistener.MainActivity$2.onTextChanged(MainActivity.java:62)
at 安卓.widget.TextView.sendOnTextChanged(TextView.java:7408)
at 安卓.widget.TextView.setText(TextView.java:3816)
at 安卓.widget.TextView.setText(TextView.java:3671)
at 安卓.widget.EditText.setText(EditText.java:80)
at 安卓.widget.TextView.setText(TextView.java:3646)
at arkstudioapps.textchangelistener.MainActivity$1.onTextChanged(MainActivity.java:38)
at 安卓.widget.TextView.sendOnTextChanged(TextView.java:7408)
at 安卓.widget.TextView.setText(TextView.java:3816)
at 安卓.widget.TextView.setText(TextView.java:3671)
at 安卓.widget.EditText.setText(EditText.java:80)
at 安卓.widget.TextView.setText(TextView.java:3646)
at arkstudioapps.textchangelistener.MainActivity$2.onTextChanged(MainActivity.java:62)
at 安卓.widget.TextView.sendOnTextChanged(TextView.java:7408)
at 安卓.widget.TextView.setText(TextView.java:3816)
at 安卓.widget.TextView.setText(TextView.java:3671)
at 安卓.widget.EditText.setText(EditText.java:80)
at 安卓.widget.TextView.setText(TextView.java:3646)
at arkstudioapps.textchangelistener.MainActivity$1.onTextChanged(MainActivity.java:38)
at 安卓.widget.TextView.sendOnTextChanged(TextView.java:7408)
at 安卓.widget.TextView.setText(TextView.java:3816)
at an
我怎样才能解决这个问题
提前谢谢
# 1 楼答案
试试这个,也许对你有帮助
# 2 楼答案
一,
当您试图在两个EditText上都使用TextWatcher时,在ContextChanged或其他TextWatcher方法中更改文本通常不是一个好主意您必须避免由于在EditText中更改文本而进入无限循环强>
如果只需要对另一个字段执行一次性计算和文本更新,则在键入一个字段时,请尝试以下操作:
在您的活动中,定义一个布尔变量,该变量将控制在TextWather方法中调用setText,并防止我们进入无限循环:
然后更新您的TextWatchers,如下所示:
二,
如果键入一些无效文本,则可能会失败
# 3 楼答案
尝试使用此代码这是EditText上的setontouchListener简单代码