Android自定义进度条的圆角横向进度条实例详解

<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"xmlns:tools="http://schemas.android.com/tools"android:id="@+id/container"android:layout_width="match_parent"android:layout_height="match_parent"tools:context="com.example.progresstest.MainActivity"tools:ignore="MergeRootFrame" ><com.example.progresstest.ProgressViewTest android:id="@+id/progressbar"android:layout_width="wrap_content"android:layout_height="wrap_content"/></LinearLayout>

package com.example.progresstest;import android.content.Context;import android.graphics.Canvas;import android.graphics.Color;import android.graphics.Paint;import android.graphics.RectF;import android.util.AttributeSet;import android.view.View;public class ProgressViewTest extends View {/**进度条最大值*/private float maxCount;/**进度条当前值*/private float currentCount;/**画笔*/private Paint mPaint;private int mWidth,mHeight;public ProgressViewTest(Context context, AttributeSet attrs, int defStyle) {super(context, attrs, defStyle);// TODO Auto-generated constructor stub}public ProgressViewTest(Context context, AttributeSet attrs) {super(context, attrs);// TODO Auto-generated constructor stub}public ProgressViewTest(Context context) {super(context);// TODO Auto-generated constructor stub}/**** 设置最大的进度值* @param maxCount*/public void setMaxCount(float maxCount) {this.maxCount = maxCount;}/*** 得到最大进度值*/public double getMaxCount(){return maxCount;}/**** 设置当前的进度值* @param currentCount*/public void setCurrentCount(float currentCount) {this.currentCount = currentCount > maxCount ? maxCount : currentCount;/*** 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。 */invalidate();}@Overrideprotected void onDraw(Canvas canvas) {// TODO Auto-generated method stubsuper.onDraw(canvas);mPaint = new Paint();//设置抗锯齿效果mPaint.setAntiAlias(true);//设置画笔颜色mPaint.setColor(Color.BLACK);int round = mHeight/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, mWidth, mHeight);/*绘制圆角矩形，背景色为画笔颜色*/canvas.drawRoundRect(rf, round, round, mPaint);/*设置progress内部是灰色*/mPaint.setColor(Color.rgb(211, 211, 211));RectF rectBlackBg = new RectF(2, 2, mWidth-2, mHeight-2);canvas.drawRoundRect(rectBlackBg, round, round, mPaint);//设置进度条进度及颜色float section = currentCount/maxCount;RectF rectProgressBg = new RectF(3, 3, (mWidth-3)*section, mHeight-3);if(section!=0.0f){mPaint.setColor(Color.GREEN);}else{mPaint.setColor(Color.TRANSPARENT);}canvas.drawRoundRect(rectProgressBg, round, round, mPaint);}//dip * scale + 0.5f * (dip >= 0 ? 1 : -1)private int dipToPx(int dip){float scale = getContext().getResources().getDisplayMetrics().density;return (int) (dip * scale + 0.5f * (dip >= 0 ? 1 : -1));//加0.5是为了四舍五入}/**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* */@Overrideprotected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) {// TODO Auto-generated method stubsuper.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) {mWidth = widthSpecSize;} else {mWidth = 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) {mHeight = dipToPx(20);} else {mHeight = heightSpecSize;}//设置控件实际大小setMeasuredDimension(mWidth, mHeight);}}

package com.example.progresstest;import android.support.v7.app.ActionBarActivity;import android.os.Bundle;import android.os.Handler;import android.os.Message;public class MainActivity extends ActionBarActivity {private ProgressViewTest progress;@Overrideprotected void onCreate(Bundle savedInstanceState) {super.onCreate(savedInstanceState);setContentView(R.layout.activity_main);progress = (ProgressViewTest) findViewById(R.id.progressbar);progress.setMaxCount(100);new Thread(new Runnable() {@Overridepublic void run() {// TODO Auto-generated method stubfor (int i = 0; i <=progress.getMaxCount(); i++) {Message msg = new Message();msg.arg1 = i;msg.what = 0x01;handler.sendMessage(msg);try {//每隔0.1秒进度前进1Thread.sleep(100);} catch (InterruptedException e) {// TODO Auto-generated catch blocke.printStackTrace();}}}}).start();}Handler handler = new Handler(){public void handleMessage(Message msg) {if(msg.what==0x01){progress.setCurrentCount(msg.arg1);}};};}