Java EditText addTextChangedListener循环
我有两个编辑文本,每一个都有文本观察者,当第一个编辑文本被更改时,它们会更改第二个编辑文本,代码似乎会创建一个循环,我能做些什么让文本观察者只听用户输入,而不是通过代码更改文本Java EditText addTextChangedListener循环,java,android,Java,Android,我有两个编辑文本,每一个都有文本观察者,当第一个编辑文本被更改时,它们会更改第二个编辑文本,代码似乎会创建一个循环,我能做些什么让文本观察者只听用户输入,而不是通过代码更改文本 et1.addTextChangedListener(new TextWatcher() { @Override public void beforeTextChanged(CharSequence s, int start, int count, int after) {
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) {
double x = Double.valueOf(et1.getText().toString());
et2.setText(String.valueOf((x*2)));
}
});
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) {
double x = Double.valueOf(et2.getText().toString());
et1.setText(String.valueOf((x/2)));
}
});
您可以在
TextWatcher
上保留一个引用,以便在需要时在操作前删除它们,然后将它们放回原处
private TextWatcher tv1;
private TextWatcher tv2;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
final EditText et1 = (EditText) findViewById(R.id.editText);
final EditText et2 = (EditText) findViewById(R.id.editText1);
tv1 = 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) {
double x = Double.valueOf(et1.getText().toString());
et2.removeTextChangedListener(tv2); // "disable" the watcher
et2.setText(String.valueOf((x*2)));
et2.addTextChangedListener(tv2); // "enable" the watcher
}
};
tv2 = 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) {
double x = Double.valueOf(et2.getText().toString());
et1.removeTextChangedListener(tv1); // "disable" the watcher
et1.setText(String.valueOf((x/2)));
et1.addTextChangedListener(tv1); // "enable" the watcher
}
};
et1.addTextChangedListener(tv1);
et2.addTextChangedListener(tv2);
}
您可以在
TextWatcher
上保留一个引用,以便在需要时在操作前删除它们,然后将它们放回原处
private TextWatcher tv1;
private TextWatcher tv2;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
final EditText et1 = (EditText) findViewById(R.id.editText);
final EditText et2 = (EditText) findViewById(R.id.editText1);
tv1 = 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) {
double x = Double.valueOf(et1.getText().toString());
et2.removeTextChangedListener(tv2); // "disable" the watcher
et2.setText(String.valueOf((x*2)));
et2.addTextChangedListener(tv2); // "enable" the watcher
}
};
tv2 = 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) {
double x = Double.valueOf(et2.getText().toString());
et1.removeTextChangedListener(tv1); // "disable" the watcher
et1.setText(String.valueOf((x/2)));
et1.addTextChangedListener(tv1); // "enable" the watcher
}
};
et1.addTextChangedListener(tv1);
et2.addTextChangedListener(tv2);
}
您可以使用
FocusChangeListener()
进行此public void-afterTextChanged(可编辑的s){if(!mIsCalledFromWatcher){mIsCalledFromWatcher=true;/*执行操作*/mIsCalledFromWatcher=false;}
。。。看看发生了什么。。。setText正在引发另一个PostTextChanged调用您已经构建了一个无休止的循环,您可以使用FocusChangeListener()
用于此public void PostTextChanged(可编辑的s){if(!mIsCalledFromWatcher){mIsCalledFromWatcher=true;/*执行操作*/mIsCalledFromWatcher=false;}
。。。看看发生了什么。。。setText正在导致另一个PostTextChanged调用您构建了一个无休止的循环