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!!!
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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