android搜索文字变色_android自定义view仿今日头条加载文字变色效果-优快云博客

本文介绍了一个简单的Android自定义View实现方案，通过该View可以实现加载过程中的文字渐变色效果。具体包括如何创建自定义View、设置画笔样式、绘制文字和进度条，以及使用Handler更新进度。

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本文实例为大家分享了android自定义view加载文字变色效果的具体代码，供大家参考，具体内容如下

不分析了,很简单,直接贴代码:

package com.loading;

import android.content.Context;

import android.graphics.Canvas;

import android.graphics.Color;

import android.graphics.Paint;

import android.graphics.Rect;

import android.os.Handler;

import android.support.annotation.Nullable;

import android.util.AttributeSet;

import android.view.View;

/**

* Created by zhouguizhijxhz on 2018/5/25.

public class LoadingView extends View{

private Paint loadPaint;

private Paint paint;

private String text = "今日头条";

private float percent;

private Handler handler = new Handler();

public LoadingView(Context context) {

this(context,null);

}

public LoadingView(Context context, @Nullable AttributeSet attrs) {

this(context, attrs,0);

}

public LoadingView(Context context, @Nullable AttributeSet attrs, int defStyleAttr) {

super(context, attrs, defStyleAttr);

initPaint();

}

@Override

protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) {

Rect bounds = new Rect();

paint.getTextBounds(text, 0, text.length(), bounds);

setMeasuredDimension(bounds.width(),bounds.height());

}

private void initPaint() {

paint = new Paint();

paint.setColor(Color.parseColor("#999999"));

paint.setTextSize(60);

loadPaint = new Paint();

loadPaint.setStyle(Paint.Style.FILL);

loadPaint.setColor(0x70ffffff);

}

@Override

protected void onDraw(Canvas canvas) {

drawText(canvas);

drawLine(canvas);

}

private void drawLine(Canvas canvas) {

if(null==canvas){

return;

}

canvas.save();

Rect bounds = new Rect();

paint.getTextBounds(text, 0, text.length(), bounds);

Rect rect = new Rect(0, 0, (int) (bounds.width()*percent), bounds.height());

canvas.clipRect(rect);

canvas.drawRect(rect,loadPaint);

canvas.restore();

handler.postDelayed(new Runnable() {

@Override

public void run() {

if(percent>=1.0){

percent=0;

}else{

percent+=0.05f;

}

postInvalidate();

}

},200);

}

private void drawText(Canvas canvas) {

if(null==canvas){

return;

}

Paint.FontMetricsInt fm = paint.getFontMetricsInt();

canvas.drawText(text, getWidth() / 2 - paint.measureText(text) / 2,

getHeight() / 2 - (fm.bottom + fm.top) / 2, paint);

}

@Override

protected void onWindowVisibilityChanged(int visibility) {

if(visibility==View.VISIBLE){

percent+=0.05f;

invalidate();

}

效果:

如果要达到头条那么好看,叫你们美工给你们2个颜色值就可以了。

以上就是本文的全部内容，希望对大家的学习有所帮助，也希望大家多多支持脚本之家。