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本篇文章给大家分享的是有关Android中怎么自定义水平渐变进度条，小编觉得挺实用的，因此分享给大家学习，希望大家阅读完这篇文章后可以有所收获，话不多说，跟着小编一起来看看吧。
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具体实现：
新建类，继承自View，在onDraw中进行绘制：
import android.content.Context;
import android.graphics.Canvas;
import android.graphics.LinearGradient;
import android.graphics.Paint;
import android.graphics.RectF;
import android.graphics.Shader;
import android.util.AttributeSet;
import android.util.Log;
import android.view.View;
/**
*
* 自定义 进度条
* Created by wenjing.tang on 2017/8/7.
*/
public class CustomizedProgressBar extends View {
private float maxCount = 100; //进度条最大值
private float currentCount; //进度条当前值
// private Paint mPaint ;
private int mWidth,mHeight;
private Context mContext;
public CustomizedProgressBar(Context context, AttributeSet attrs, int defStyleAttr) {
super(context, attrs, defStyleAttr);
initView(context);
}
public CustomizedProgressBar(Context context, AttributeSet attrs) {
super(context, attrs);
initView(context);
}
public CustomizedProgressBar(Context context) {
super(context);
initView(context);
}
private void initView(Context context) {
mContext=context;
}
@Override
protected void onDraw(Canvas canvas) {
super.onDraw(canvas);
Paint mPaint = new Paint();
mPaint.setAntiAlias(true);
int round = mHeight/2; //半径
mPaint.setColor(getResources().getColor(R.color.white_alpha)); //设置边框背景颜色
RectF rectBg = new RectF(0, 0, mWidth, mHeight);
canvas.drawRoundRect(rectBg, round, round, mPaint);//绘制 最外面的大 圆角矩形，背景为白色
float section = currentCount/maxCount; //进度条的比例
RectF rectProgressBg = new RectF(0, 0, mWidth*section, mHeight);
Log.e("CustomizedProgressBar", currentCount+"");
Log.e("CustomizedProgressBar", section+"");
//Paint设置setColor(白色无透明)和setShader，只让setShader生效；不然前面setColor设置了透明度，透明度会生效，和setShader效果叠加
mPaint.setColor(getResources().getColor(R.color.white));
mPaint.setShader(getLinearGradient());
canvas.drawRoundRect(rectProgressBg, round, round, mPaint); //最左边的圆角矩形
if (maxCount != currentCount){ //如果不是100%，绘制第三段矩形
RectF rectProgressBg2 = new RectF(mWidth*section-round, 0, mWidth*section, mHeight);
mPaint.setShader(getLinearGradient());
canvas.drawRect(rectProgressBg2, mPaint);
}
}
private LinearGradient linearGradient;
private LinearGradient getLinearGradient(){
if(linearGradient==null){
linearGradient = new LinearGradient(0, 0, getWidth(), mHeight, new int[]{mContext.getResources().getColor(R.color.progress_color_1),
mContext.getResources().getColor(R.color.progress_color_2)}, null, Shader.TileMode.CLAMP); //根据R文件中的id获取到color
}
return linearGradient;
}
private int dipToPx(int dip) {
float scale = getContext().getResources().getDisplayMetrics().density;
return (int) (dip * scale + 0.5f * (dip >= 0 ? 1 : -1));
}
/***
* 设置最大的进度值
* @param maxCount 最大的进度值
*/
public void setMaxCount(float maxCount) {
this.maxCount = maxCount;
}
/***
* 设置当前的进度值
* @param currentCount 当前进度值
*/
public void setCurrentCount(float currentCount) {
this.currentCount = currentCount > maxCount ? maxCount : currentCount;
invalidate();
}
public float getMaxCount() {
return maxCount;
}
public float getCurrentCount() {
return currentCount;
}
@Override
protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) {
int widthSpecMode = MeasureSpec.getMode(widthMeasureSpec);
int widthSpecSize = MeasureSpec.getSize(widthMeasureSpec);
int heightSpecMode = MeasureSpec.getMode(heightMeasureSpec);
int heightSpecSize = MeasureSpec.getSize(heightMeasureSpec);
if (widthSpecMode == MeasureSpec.EXACTLY || widthSpecMode == MeasureSpec.AT_MOST) {
mWidth = widthSpecSize;
} else {
mWidth = 0;
}
if (heightSpecMode == MeasureSpec.AT_MOST || heightSpecMode == MeasureSpec.UNSPECIFIED) {
mHeight = dipToPx(18);
} else {
mHeight = heightSpecSize;
}
setMeasuredDimension(mWidth, mHeight);
}
}其中用到的一些资源文件如下：
