EditTextView 提示带图标

最新推荐文章于 2023-09-25 16:59:00 发布

原创最新推荐文章于 2023-09-25 16:59:00 发布 · 695 阅读

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本文介绍如何在Android中实现EditTextView的提示文本带有图标的功能。内容涉及到图标与文字的对齐问题，以及光标位置调整，通过计算并填充空格来确保提示文字与图标正确对齐。

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code 未完善（文字图标未对齐光标在图标左边提示文字右边通过空格实现(需计算距离填充hint的空格)） xml请填充

drawableLeft 标签

package com.rkt.thirddemo;

import android.content.Context;
import android.graphics.Canvas;
import android.graphics.drawable.Drawable;
import android.text.Editable;
import android.text.TextWatcher;
import android.util.AttributeSet;
import android.util.Log;

public class MyEditView extends androidx.appcompat.widget.AppCompatEditText {


    private   Drawable leftDrawable;
    private int leftWidth;
    private int compoundPaddingTop;
    private int compoundPaddingLeft;

    private  boolean drawLeft=true;
    private  float textPx=0;

    public MyEditView(Context context) {
        super(context);
        init();
    }

    public MyEditView(Context context, AttributeSet attrs) {
        super(context, attrs);
        init();
    }

    public MyEditView(Context context, AttributeSet attrs, int defStyleAttr) {
        super(context, attrs, defStyleAttr);
        init();
    }

    private void init (){
         leftDrawable =getCompoundDrawables()[0];
         leftWidth = leftDrawable.getIntrinsicWidth();
         compoundPaddingTop = getCompoundPaddingTop();
         compoundPaddingLeft = getCompoundPaddingLeft();
         setCompoundDrawables(null,null,null,null);

         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(s.length()==0){
                     drawLeft=true;
                 }else {
                     drawLeft=false;
                 }
             }

             @Override
             public void afterTextChanged(Editable s) {

             }
         });
    }


    public static int dip2px(Context context, float dpValue) {
        final float scale =context.getResources().getDisplayMetrics().density;
        return(int) (dpValue * scale + 0.5f);
    }


    @Override
    protected void onDraw(Canvas canvas) {
        int x=getScrollX() + getPaddingLeft();
        int y=getScrollY() + getPaddingTop();
        if(leftDrawable!=null && drawLeft){
            canvas.save();
            canvas.translate( x, y);
            leftDrawable.draw(canvas);
            canvas.restore();
        }
        canvas.translate(0, (leftWidth-textPx)/2-y);
        super.onDraw(canvas);
    }

}