[英]Set visibility to GONE, if TextView displays a specific text
有什么辦法可以讓TextView
顯示特定的文本,例如0%的折扣,使文本可見性設置為其他可見。
就像這段代碼
if(text.length() == 0 || text.equals(""))
{
mTel1.setVisibility(View.GONE);
} else {
mTel1.setVisibility(View.VISIBLE);
}
是的,您可以在偵聽器中實現您的邏輯,只要用戶更改EditText
的文本,該邏輯就會觸發。 讓您的活動實現TextWatcher
,然后在您的活動中嘗試如下操作:
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
EditText ed = new EditText(this);
ed.addTextChangedListener(this);
setContentView(editText);
// plus your current code
}
@Override
public void onTextChanged(CharSequence s, int start, int before, int count) {
String ed_text = ed.getText();
if (ed_text.length() == 0 || ed_text.equals("")) {
mTel1.setVisibility(View.GONE);
}
else {
mTel1.setVisibility(View.VISIBLE);
}
}
注意:此答案最初是在OP詢問有關EditText
。 從那時起,OP將問題更改為TextView
,但是我上面建議的內容通常可以用於任何偵聽器(例如,正在更新TextView
的偵聽器)。
final TextView text=findViewById(R.id.myTextView);
text.addTextChangedListener(new TextWatcher() {
@Override
public void beforeTextChanged(CharSequence charSequence, int i, int i1, int i2) {
}
@Override
public void onTextChanged(CharSequence charSequence, int i, int i1, int i2) {
}
@Override
public void afterTextChanged(Editable editable) {
if(editable.toString().equals("Your Text ")){
// 1 - You can set empty text
text.setText("");
// 2 - Or you can change the color of the text
text.setTextColor(Color.TRANSPARENT);
// 3 - Or you can change the visibility of the view
text.setVisibility(View.INVISIBLE);
}else{
//Here you should undo your code
//1 - if you using method one dose not need to do anything here
// for method 2
text.setTextColor(Color.BLACK);
// for method 3
text.setVisibility(View.VISIBLE);
}
}
});
您可以使用更改文字顏色來完成此操作
tvPoints.setTextColor(Color.TRANSPARENT);
如果要顯示1%的 CardView
則將TextView
包裹到CardView
或LinearLayout
並在recyclerview適配器中嘗試此操作。
class ViewHolder extends RecyclerView.ViewHolder{
public TextView discountedvalue;
public CardView cardview;
public ViewHolder(View itemView) {
super(itemView);
discountedvalue = (TextView) itemView.findViewById(R.id.DiscountValue);
cardview = (CardView) itemView.findViewById(R.id.cardview);
discountedvalue.addTextChangedListener(new TextWatcher() {
@Override
public void beforeTextChanged(CharSequence charSequence, int i, int i1, int i2) {
}
@Override
public void onTextChanged(CharSequence charSequence, int i, int i1, int i2) {
}
@Override
public void afterTextChanged(Editable editable) {
if(editable.toString().equals("0 % off")){
cardview.setVisibility(View.GONE);
}else{
cardview.setVisibility(View.VISIBLE);
}
}
});
}
}
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