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Android自定义圆角矩形进度条2

作者:互联网

效果图:

  或 

方法讲解:

(1)invalidate()方法

invalidate()是用来刷新View的,必须是在UI线程中进行工作。比如在修改某个view的显示时, 调用invalidate()才能看到重新绘制的界面。invalidate()的调用是把之前的旧的view从主UI线程队列中pop掉。一般在自定义控件中会用到这个方法。

(2)RectF方法的应用

RectF是用来绘画矩形的方法。 

RectF(left,top,right,bottom),四个参数的含义分别是父控件距离矩形左上右下边距的距离,以下用图来说明:

drawRoundRect方法是用来绘制圆角矩形的,它的参数如下: 
参数说明 

rect:RectF对象。 
rx:x方向上的圆角半径。 
ry:y方向上的圆角半径。 
paint:绘制时所使用的画笔。

(3)onMeasure方法

指定自定义控件在屏幕上的大小,onMeasure方法的两个参数是由上一层控件 传入的大小,而且是模式和尺寸混合在一起的数值,需要MeasureSpec.getMode(widthMeasureSpec) 得到模式,MeasureSpec.getSize(widthMeasureSpec)得到尺寸。

onMeasure的几种模式分别为EXACTLY,AT_MOST,UNSPECIFIED。

[1]MeasureSpec.EXACTLY

MeasureSpec.EXACTLY是精确尺寸,当我们将控件的layout_width或layout_height指定为具体数值时如andorid:layout_width=”50dip”,或者为FILL_PARENT是,都是控件大小已经确定的情况,都是精确尺寸。

[2]MeasureSpec.AT_MOST

MeasureSpec.AT_MOST是最大尺寸,当控件的layout_width或layout_height指定为WRAP_CONTENT时,控件大小一般随着控件的子空间或内容进行变化,此时控件尺寸只要不超过父控件允许的最大尺寸即可。因此,此时的mode是AT_MOST,size给出了父控件允许的最大尺寸。

[3]MeasureSpec.UNSPECIFIED

MeasureSpec.UNSPECIFIED是未指定尺寸,这种情况不多,一般都是父控件是AdapterView,通过measure方法传入的模式。

实现步骤:

a、在values文件夹下新建attrs.xml,内容如下:

<?xml version="1.0" encoding="utf-8"?>
<resources>

<declare-styleable name="CircleProgressBar">
<attr name="croundColor" format="color"/>
<attr name="croundProgressColor" format="color"/>
<attr name="cfillColor" format="color"/>
<attr name="croundWidth" format="dimension"></attr>
<attr name="croundProgressWidth" format="dimension"></attr> 
<attr name="ctextColor" format="color" /> 
<attr name="ctextSize" format="dimension" /> 
<attr name="cnumberSize" format="dimension" /> 
<attr name="cparaLable" format="string" />
<attr name="cunitLable" format="string" /> 
</declare-styleable>

<declare-styleable name="RoundRectProgressBar">
<attr name="cbarRoundColor" format="color"/>
<attr name="cbarProgressColor" format="color"/>
<attr name="cbarFillColor" format="color"/>
<attr name="cbarOrientation">
  <enum name="HORIZONTAL" value="0"></enum>
  <enum name="VERTICAL" value="1"></enum>
</attr>
</declare-styleable>

</resources>

  


b、新建RoundRectProgressBar类继承View

import android.content.Context;
import android.content.res.TypedArray;
import android.graphics.Canvas;
import android.graphics.Color;
import android.graphics.Paint;
import android.graphics.RectF;
import android.util.AttributeSet;
import android.view.View;

/**
* 自定义圆角矩形进度条view
*
* @author xl
*/
public class RoundRectProgressBar extends View {

private final static String TAG = RoundRectProgressBar.class.getSimpleName();

/**
* 画笔对象的引用
*/
private Paint paint;

/**
* 圆角环的颜色
*/
private int roundColor;

/**
* 进度的颜色
*/
private int fillProgressColor;

/**
* 填充的颜色
*/
private int fillColor;

/**
* 圆角矩形宽度
*/
private int roundWidth;

/**
* 圆角矩形高度
*/
private int roundHeight;

/**
* 进度条方向,0水平,1垂直
*/
private int barOrientation;

/**
* 进度条最大值
*/
private float max = 100;

/**
* 进度条当前值
*/
private float progress = 30;

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

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

public RoundRectProgressBar(Context context, AttributeSet attrs, int defStyle) {
super(context, attrs, defStyle);
//获取画笔
paint = new Paint();
TypedArray mTypedArray = context.obtainStyledAttributes(attrs, R.styleable.RoundRectProgressBar);
//获取自定义属性和默认值
roundColor = mTypedArray.getColor(R.styleable.RoundRectProgressBar_cbarRoundColor, Color.RED);
fillProgressColor = mTypedArray.getColor(R.styleable.RoundRectProgressBar_cbarProgressColor, Color.GREEN);
fillColor = mTypedArray.getColor(R.styleable.RoundRectProgressBar_cbarFillColor, Color.BLUE);
barOrientation = mTypedArray.getInt(R.styleable.RoundRectProgressBar_cbarOrientation, 0);
//回收TypedArray资源
mTypedArray.recycle();
}

@Override
protected void onDraw(Canvas canvas) {
super.onDraw(canvas);
//设置抗锯齿效果
paint.setAntiAlias(true);
//设置画笔颜色
paint.setColor(roundColor);
//进度方向
if (barOrientation == 0) {
//水平,向右
try {
int round = roundHeight / 2;
//RectF:绘制矩形,四个参数分别是left,top,right,bottom,类型是单精度浮点数
RectF rf = new RectF(0, 0, roundWidth, roundHeight);
//绘制圆角矩形,背景色为画笔颜色
canvas.drawRoundRect(rf, round, round, paint);
//设置progress内部是灰色
paint.setColor(fillColor);
RectF rectBlackBg = new RectF(2, 2, roundWidth - 2, roundHeight - 2);
canvas.drawRoundRect(rectBlackBg, round, round, paint);
//设置进度条进度及颜色
float section = progress / max;
RectF rectProgressBg = new RectF(2, 2, (roundWidth - 2) * section, roundHeight - 2);
if (section != 0.0f) {
paint.setColor(fillProgressColor);
} else {
paint.setColor(Color.TRANSPARENT);
}
canvas.drawRoundRect(rectProgressBg, round, round, paint);
} catch (Exception e) {
e.printStackTrace();
}
} else {
//垂直,向上
try {
int round = roundWidth / 2;
//RectF:绘制矩形,四个参数分别是left,top,right,bottom,类型是单精度浮点数
RectF rf = new RectF(0, 0, roundWidth, roundHeight);
//绘制圆角矩形,背景色为画笔颜色
canvas.drawRoundRect(rf, round, round, paint);
//设置progress内部是灰色
paint.setColor(fillColor);
RectF rectBlackBg = new RectF(2, 2, roundWidth - 2, roundHeight - 2);
canvas.drawRoundRect(rectBlackBg, round, round, paint);
//设置进度条进度及颜色
float section = progress / max;
RectF rectProgressBg = new RectF(2, roundHeight - 2 - (roundHeight - 4) * section, roundWidth - 2, roundHeight - 2);
if (section != 0.0f) {
paint.setColor(fillProgressColor);
} else {
paint.setColor(Color.TRANSPARENT);
}
canvas.drawRoundRect(rectProgressBg, round, round, paint);
} catch (Exception e) {
e.printStackTrace();
}
}
}

/**
* dip转px
*
* @param dip
* @return
*/
private int dipToPx(int dip) {
float scale = getContext().getResources().getDisplayMetrics().density;
//加0.5是为了四舍五入
return (int) (dip * scale + 0.5f * (dip >= 0 ? 1 : -1));
}

/**
* 指定自定义控件在屏幕上的大小,onMeasure方法的两个参数是由上一层控件
* 传入的大小,而且是模式和尺寸混合在一起的数值,需要MeasureSpec.getMode(widthMeasureSpec)
* 得到模式,MeasureSpec.getSize(widthMeasureSpec)得到尺寸
*/
@Override
protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) {
super.onMeasure(widthMeasureSpec, heightMeasureSpec);
int widthSpecMode = MeasureSpec.getMode(widthMeasureSpec);
int heightSpecMode = MeasureSpec.getMode(heightMeasureSpec);
int widthSpecSize = MeasureSpec.getSize(widthMeasureSpec);
int heightSpecSize = MeasureSpec.getSize(heightMeasureSpec);
//MeasureSpec.EXACTLY,精确尺寸
if (widthSpecMode == MeasureSpec.EXACTLY || widthSpecMode == MeasureSpec.AT_MOST) {
roundWidth = widthSpecSize;
} else {
roundWidth = 0;
}
if (heightSpecMode == MeasureSpec.EXACTLY || heightSpecMode == MeasureSpec.AT_MOST) {
roundHeight = heightSpecSize;
} else {
roundHeight = 0;
}
//MeasureSpec.AT_MOST,最大尺寸,只要不超过父控件允许的最大尺寸即可,MeasureSpec.UNSPECIFIED未指定尺寸
//if (heightSpecMode == MeasureSpec.AT_MOST || heightSpecMode == MeasureSpec.UNSPECIFIED) {
// roundHeight = dipToPx(20);
//} else {
// roundHeight = heightSpecSize;
//}
//设置控件实际大小
setMeasuredDimension(roundWidth, roundHeight);
}


/**
* 设置进度
*
* @param progress
*/
public synchronized void setProgress(float progress) {
if (progress < 0) {
throw new IllegalArgumentException("value can not be negative");
}
if (progress > max) {
this.progress = max;
} else {
this.progress = progress;
}
postInvalidate();
}

/**
* 设置最大值
*
* @param max
*/
public synchronized void setMax(float max) {
if (max < 0) {
throw new IllegalArgumentException("value can not be negative");
}
this.max = max;
}

}

  


c、布局文件中引用activity_main.xml

<ups.invt.com.view.RoundRectProgressBar
android:id="@+id/bar"
android:layout_width="20dp"
android:layout_height="100dp"
android_custom:cbarRoundColor="@color/transparent"
android_custom:cbarFillColor="@color/white"
android_custom:cbarProgressColor="@color/bar_fill_color"
android_custom:cbarOrientation="VERTICAL"
android:layout_centerInParent="true"/>

  


d、MainActivity.java中设置进度

progress = (RoundRectProgressBar) findViewById(R.id.bar);
progress.setMax(100);

progress.setProgress(80);


完!!!
————————————————

参考于:https://blog.csdn.net/xialong_927/article/details/86596932

标签:控件,MeasureSpec,自定义,进度条,int,RectF,paint,progress,Android
来源: https://www.cnblogs.com/changyiqiang/p/11399187.html