Android实现EditText文本颜色渐变

程序员飞飞

发布于 2020-02-27 16:16:52

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代码可运行

文章被收录于专栏：Android&Java技术Android&Java技术

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代码可运行

Android实现EditText文本颜色渐变

先上效果图

刚开始想着先是设置textColor属性就可以了，然后写了个一个带渐变的shap感觉不好使，于是乎就自定义解决，代码如下

import android.content.Context;
import android.graphics.Canvas;
import android.graphics.LinearGradient;
import android.graphics.Paint;
import android.graphics.Rect;
import android.graphics.Shader;
import android.util.AttributeSet;
import android.widget.EditText;

public class MyEditText extends EditText {

    public MyEditText(Context context) {
        this(context, null);
    }

    public MyEditText(Context context, AttributeSet attrs) {
        this(context, attrs, 0);
    }

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

    private Paint mPaint;
    private int mViewHeight = 0;
    private Rect mTextBound = new Rect();
    private LinearGradient mLinearGradient;

    @Override
    protected void onDraw(Canvas canvas) {
        mViewHeight = getMeasuredHeight();
        mPaint = getPaint();
        String mText = getText().toString();
        mPaint.getTextBounds(mText, 0, mText.length(), mTextBound);
        mLinearGradient = new LinearGradient(0, 0, 0, mViewHeight,
                new int[]{0xFF8EDA4D, 0xFF4EB855}, null, Shader.TileMode.REPEAT);
        mPaint.setShader(mLinearGradient);
        canvas.drawText(mText, getMeasuredWidth() / 2 - mTextBound.width() / 2, getMeasuredHeight() / 2 + mTextBound.height() / 2, mPaint);
    }

}

我这里实现的是上下的渐变色，当然每个人的需求都不一样，有的要实现左右渐变色，只要在这句中设置其属性即可mLinearGradient = new LinearGradient(0, 0, 0, mViewHeight, new int[]{0xFF8EDA4D, 0xFF4EB855}, null, Shader.TileMode.REPEAT)