我正在尝试创建两个EditText,当我在其中一个EditText中输入任何内容时,我输入的文本将显示在另一个EditText上。
private EditText input_a;
private EditText input_b;
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.main);
input_a = (EditText) findViewById(R.id.input_a);
input_b = (EditText) findViewById(R.id.input_b);
input_a.setOnFocusChangeListener(this);
input_b.setOnFocusChangeListener(this);
}
@Override
public void onFocusChange(View v,boolean hasFocus) {
// TODO Auto-generated method stub
if(v==input_a && hasFocus){
input_a.setText("");
input_b.setText("");
input_a.addTextChangedListener(new TextWatcher(){
@Override
public void afterTextChanged(Editable s) {
// TODO Auto-generated method stub
input_b.setText(input_a.getText());
}
@Override
public void beforeTextChanged(CharSequence s, int start,
int count, int after) {
// TODO Auto-generated method stub
}
@Override
public void onTextChanged(CharSequence s, int start,
int before, int count) {
// TODO Auto-generated method stub
}
});
}else if(v==input_b && hasFocus){
input_b.setText("");
input_a.setText("");
input_b.addTextChangedListener(new TextWatcher(){
@Override
public void afterTextChanged(Editable s) {
// TODO Auto-generated method stub
input_a.setText(input_b.getText());
}
@Override
public void beforeTextChanged(CharSequence s, int start,
int count, int after) {
// TODO Auto-generated method stub
}
@Override
public void onTextChanged(CharSequence s, int start,
int before, int count) {
// TODO Auto-generated method stub
}
});
}
当我在input_a中输入时,它可以正常工作,我输入的文本会显示在input_b中,但是当我在input_b中输入时,应用程序会意外关闭。我不明白为什么这两个代码块非常相似,但只有一个能正常工作。