其實這個手機號默認格式化,非常非常簡單的,我們只需要TextChangerListener監聽器就足夠了
import android.content.Context;
import android.text.Editable;
import android.text.TextWatcher;
import android.util.AttributeSet;
import android.util.Log;
import android.widget.EditText;
/**
* @author The sky seems to be raining
* @class 手機號格式化,3-4-4的格式
* @time 2019/9/6 4:08 PM
* @Email [email protected]
*/
public class TelEdittext extends EditText {
public boolean isTel = true;
private String addString = " ";
private boolean isRun = false;
public TelEdittext(Context context) {
this(context, null);
}
public TelEdittext(Context context, AttributeSet attrs) {
super(context, attrs);
init();
}
private void init() {
addTextChangedListener(new TextWatcher() {
@Override
public void onTextChanged(CharSequence s, int start, int before, int count) {
Log.i("tag", "onTextChanged()之前");
if (isRun) {//不加這個全局變量的判斷;會導致onTextChanged()連續執行,出現死循環,爲什麼呢,文末會加以說明
isRun = false;
return;
}
isRun = true;
Log.i("tag", "onTextChanged()");
if (isTel) {
String finalString = "";
int index = 0;
String telString = s.toString().replace(" ", "");
if ((index + 3) < telString.length()) {
finalString += (telString.substring(index, index + 3) + addString);
index += 3;
}
while ((index + 4) < telString.length()) {
finalString += (telString.substring(index, index + 4) + addString);
index += 4;
}
finalString += telString.substring(index, telString.length());
TelEdittext.this.setText(finalString);
//此語句不可少,否則輸入的光標會出現在最左邊,不會隨輸入的值往右移動
TelEdittext.this.setSelection(finalString.length());
}
}
@Override
public void beforeTextChanged(CharSequence s, int start, int count,
int after) {
}
@Override
public void afterTextChanged(Editable s) {
}
});
}
}
解釋一下,爲什麼會出現死循環呢
因爲,每次輸入的變化,都會響應這個change事件,就會重新調用一次,如果你在變化的回調中,setText,那麼直接就會出現死循環,一次接一次的調用,就會出現內存溢出了,解釋的不專業,大概就是這麼個意思