我有一个关于Android中EditText的问题。我该如何设置提示文字居中,但文本左对齐?非常感谢。
我只是想让光标位于EditText的左侧,同时提示文字位于中心。
我只是想让光标位于EditText的左侧,同时提示文字位于中心。
您可以通过Java代码以编程方式完成此操作。例如:
final EditText editTxt = (EditText) findViewById(R.id.my_edit_text);
editTxt.setGravity(Gravity.CENTER_HORIZONTAL);
editTxt.setOnKeyListener(new OnKeyListener() {
@Override
public boolean onKey(View v, int keyCode, KeyEvent event) {
if (event.getAction() != KeyEvent.ACTION_UP) return false;
if (editTxt.getText().length() > 1) return false;
if (editTxt.getText().length() == 1) {
editTxt.setGravity(Gravity.LEFT);
}
else {
editTxt.setGravity(Gravity.CENTER_HORIZONTAL);
}
return false;
}
});
editTxt.setOnFocusChangeListener(new OnFocusChangeListener() {
@Override
public void onFocusChange(View v, boolean hasFocus) {
if (hasFocus) {
editTxt.setGravity(Gravity.LEFT);
}
else {
if (editTxt.getText().length() == 0) {
editTxt.setGravity(Gravity.CENTER_HORIZONTAL);
}
}
}
});
您可以使用这种方式(在提示前添加所需数量的空格)。 将此代码添加到您的自定义EditText类中:
@Override
protected void onSizeChanged (int w, int h, int oldw, int oldh) {
super.onSizeChanged(w, h, oldw, oldh);
String hint = getContext().getString(R.string.my_hint);
float spaceSize = getPaint().measureText(" ");
float textSize = getPaint().measureText(hint);
int freeSpace = w - this.getPaddingLeft() - this.getPaddingRight();
int spaces = 0;
if (freeSpace > textSize) {
spaces = (int) Math.ceil((freeSpace - textSize) / 2 / spaceSize);
}
if (spaces > 0) {
Log.i(TAG, "Adding "+spaces+" spaces to hint");
hint = prependStringWithRepeatedChars(hint, ' ', spaces);
}
setHint(hint);
}
private String prependStringWithRepeatedChars(/* some args */) {
/// add chars to the beginning of string
}