Android 之 Edittext输入四位自动空格

1. 自定义HPEditText继承EditText

import android.content.Context;
import android.text.Editable;
import android.text.TextWatcher;
import android.util.AttributeSet;
import android.widget.EditText;

public class HPEditText extends EditText {
    
    
    private boolean isRun = false;
    private String d = "";
    public HPEditText(Context context) {
        super(context);
        setBankCardTypeOn();
    }

    public HPEditText(Context context, AttributeSet attrs) {
        super(context, attrs);
        setBankCardTypeOn();
    }

    public HPEditText(Context context, AttributeSet attrs, int defStyleAttr) {
        super(context, attrs, defStyleAttr);
        setBankCardTypeOn();
    }


    private void setBankCardTypeOn() {
        HPEditText.this.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) {
                    if(isRun){
                        isRun=false;
                        return;
                    }
                isRun = true;
                d = "";
                String newStr = s.toString();
                newStr = newStr.replace(" ", "");
                int index = 0;
                while ((index + 4) < newStr.length()){
                    d += (newStr.substring(index, index + 4) + " ");
                    index += 4;
                }
                d += (newStr.substring(index, newStr.length()));
                int i = getSelectionStart();
                HPEditText.this.setText(d);
                try {


                    if (i % 5 == 0 && before == 0) {
                        if (i + 1 <= d.length()) {
                            HPEditText.this.setSelection(i + 1);
                        } else {
                            HPEditText.this.setSelection(d.length());
                        }
                    } else if (before == 1 && i < d.length()) {
                        HPEditText.this.setSelection(i);
                    } else if (before == 0 && i < d.length()) {
                        HPEditText.this.setSelection(i);
                    } else
                        HPEditText.this.setSelection(d.length());


                }catch (Exception e){

                }
            }

            @Override
            public void afterTextChanged(Editable s) {

            }
        });

    }
//对外提供暴漏的方法
    private void insertText(EditText editText, String mText) {
        editText.getText().insert(getSelectionStart(), mText);

    }
}

1. 看看edittext.xml吧
   需要注意的是包名+类型

 <com.example.administrator.okhttp.HPEditText
       android:id="@+id/hPEditText1"
       android:layout_width="match_parent"
       android:layout_height="wrap_content"
       android:layout_alignParentTop="true"
       android:layout_centerHorizontal="true"
       android:layout_marginTop="131dp"
       android:ems="10"
       android:inputType="number"  />

• 效果图