自定义view——环形进度条，带progress值

第一步：新建文件Circle.java

package com.lancy.demo.democircle.widget;

import android.annotation.SuppressLint;

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;

import com.lancy.demo.democircle.R;

public class Circle extends View {

private Paint mPaint;

private float strokeWidth = 10;

private float progress = 0;

private int defaultColor;

private int activeColor;

public Circle(Context context, AttributeSet attrs) {

super(context, attrs);

TypedArray a = context.obtainStyledAttributes(attrs, R.styleable.circle);

strokeWidth = a.getDimension(R.styleable.circle_strokeWidth, strokeWidth);

progress = a.getFraction(R.styleable.circle_progress, 360, 100, 10);

defaultColor = a.getColor(R.styleable.circle_defaultColor, Color.GRAY);

activeColor = a.getColor(R.styleable.circle_activeColor, Color.BLUE);

a.recycle();

}

public Circle(Context context) {

this(context, null);

}

@Override

protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) {

// TODO Auto-generated method stub

super.onMeasure(widthMeasureSpec, heightMeasureSpec);

final int minimumWidth = getSuggestedMinimumWidth();

final int minimumHeight = getSuggestedMinimumHeight();

int viewWidth = resolveMeasured(widthMeasureSpec, minimumWidth);

int viewHeight = resolveMeasured(heightMeasureSpec, minimumHeight);

setMeasuredDimension(viewWidth, viewHeight);

}

private int resolveMeasured(int measureSpec, int desired) {

int result = 0;

int specSize = MeasureSpec.getSize(measureSpec);

switch (MeasureSpec.getMode(measureSpec)) {

case MeasureSpec.UNSPECIFIED:

result = desired;

break;

case MeasureSpec.AT_MOST:

result = Math.max(specSize, desired);

break;

case MeasureSpec.EXACTLY:

default:

result = specSize;

}

return result;

}

@SuppressLint("DrawAllocation")

@Override

protected void onDraw(Canvas canvas) {

// TODO Auto-generated method stub

super.onDraw(canvas);

int width = getWidth();

int height = getHeight();

float h = width > height ? height : width;

Paint p = new Paint();

p.setColor(defaultColor);

p.setStyle(Paint.Style.STROKE);

p.setAntiAlias(true);

p.setStrokeWidth(strokeWidth);

RectF oval1 = new RectF(strokeWidth / 2, strokeWidth / 2, h-strokeWidth / 2, h-strokeWidth / 2);

canvas.drawArc(oval1, 0, 360, false, p);

p.setColor(activeColor);

canvas.drawArc(oval1, 270, progress, false, p);//小弧形

}

public void setProgress(float progress) {

this.progress = progress / 100 * 360;

invalidate();

}

public float getProgress() {

return progress * 100 / 360;

}

}

第二步  新建attrs.xml

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

<resources>

<declare-styleable name="circle">

<attr name="strokeWidth" format="dimension"></attr>

<attr name="progress" format="fraction"></attr>

<attr name="defaultColor" format="color"></attr>

<attr name="activeColor" format="color"></attr>

</declare-styleable>

</resources>

第三步  建布局文件 circle.xml

<?xml version="1.0" encoding="utf-8"?> 
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android" 
xmlns:circle="http://schemas.android.com/apk/res/com.lancy.demo.democircle" 
android:layout_width="match_parent" 
android:layout_height="match_parent" 
android:padding="50dp" 
android:gravity="center" 
android:orientation="vertical" >

<com.lancy.demo.democircle.widget.Circle 
android:id="@+id/circle" 
android:layout_width="match_parent" 
android:layout_height="match_parent" 
circle:defaultColor="#95a1aa" 
circle:activeColor="#1290dd" 
circle:strokeWidth="10dp" 
circle:progress="25%" 
/>

<!-- -->

</LinearLayout>

第三步 建MainActivity.java

package com.lancy.demo.democircle;

import android.app.Activity;

import android.content.BroadcastReceiver;

import android.content.Context;

import android.content.Intent;

import android.content.IntentFilter;

import android.os.Bundle;

import android.util.Log;

import com.lancy.demo.democircle.widget.Circle;

public class MainActivity extends Activity {

Circle circle;

@Override

protected void onCreate(Bundle savedInstanceState) {

// TODO Auto-generated method stub

super.onCreate(savedInstanceState);

setContentView(R.layout.circle);

circle = (Circle) findViewById(R.id.circle);

IntentFilter filter = new IntentFilter();

filter.addAction(Intent.ACTION_TIME_TICK);

registerReceiver(new TimeReceiver(), filter);

}

class TimeReceiver extends BroadcastReceiver{

@Override

public void onReceive(Context context, Intent intent) {

Log.i("TimeReceiver----------------", intent.getAction());

circle.setProgress(circle.getProgress()-1);

}

}

}