效果图：
xml 布局：
···
xmlns:ap="http://schemas.android.com/apk/res-auto"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:orientation="vertical"
tools:context="com.example.progress.MainActivity">
···
MainActivity 中代码
···
package com.example.progress;
import android.os.SystemClock;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.view.View;
public class MainActivity extends AppCompatActivity {
private RoundProgress progress;
Runnable runnable=new Runnable() {
@Override
public void run() {
progress.setMax(100);
for (int i = 0; i <90 ; i++) {
progress.setProgress(i+1);
SystemClock.sleep(20);
//强制重绘
// progress.invalidate(); //只有主线程可以调用
progress.postInvalidate();//主线程 分线程都可以如此调用
}
}
};
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
init();
}
private void init() {
progress = (RoundProgress) findViewById(R.id.progress);
//分线程 实现进度变化
new Thread(runnable).start();
}
}
···
自定义类 RoundProgress 继承View
具体代码
···
package com.example.progress;
import android.content.Context;
import android.content.res.TypedArray;
import android.graphics.Canvas;
import android.graphics.Color;
import android.graphics.Paint;
import android.graphics.Rect;
import android.graphics.RectF;
import android.util.AttributeSet;
import android.view.View;
/**
Created by shkstart on 2016/12/3 0003.
-
自定义视图
*/
public class RoundProgress extends View {//设置绘制的圆环及文本的属性---->使用自定义属性替换
// private int roundColor = Color.GRAY;//圆环的颜色
// private int roundProgressColor = Color.RED;//圆弧的颜色
// private int textColor = Color.BLUE;//文本的颜色
//
// private int roundWidth = UIUtils.dp2px(10);//圆环的宽度
// private int textSize = UIUtils.dp2px(20);//文本的字体大小
//
// private int max = 100;//圆环的最大值
// private int progress = 60;//圆环的进度//使用自定义属性来初始化如下的变量
private int roundColor;//圆环的颜色
private int roundProgressColor ;//圆弧的颜色
private int textColor;//文本的颜色private float roundWidth ;//圆环的宽度
private float textSize ;//文本的字体大小private int max;//圆环的最大值
private int progress;//圆环的进度private int width;//当前视图的宽度（=高度）
private Paint paint;//画笔
public RoundProgress(Context context) {
this(context, null);
}public RoundProgress(Context context, AttributeSet attrs) {
this(context, attrs, 0);
}public RoundProgress(Context context, AttributeSet attrs, int defStyleAttr) {
super(context, attrs, defStyleAttr);//初始化画笔 paint = new Paint(); paint.setAntiAlias(true);//去除毛边 //获取自定义的属性 //1.获取TypeArray的对象(调用两个参数的方法） TypedArray typedArray = context.obtainStyledAttributes(attrs, R.styleable.RoundProgress); //2.取出所有的自定义属性 roundColor = typedArray.getColor(R.styleable.RoundProgress_roundColor, Color.GRAY); roundProgressColor = typedArray.getColor(R.styleable.RoundProgress_roundProgressColor,Color.RED); textColor = typedArray.getColor(R.styleable.RoundProgress_textColor,Color.GREEN); roundWidth = typedArray.getDimension(R.styleable.RoundProgress_roundWith,UIUtils.dp2px(10)); textSize = typedArray.getDimension(R.styleable.RoundProgress_textSize,UIUtils.dp2px(20)); max = typedArray.getInteger(R.styleable.RoundProgress_max,100); progress = typedArray.getInteger(R.styleable.RoundProgress_progress,30); //3.回收处理 typedArray.recycle();}
public int getMax() {
return max;
}public void setMax(int max) {
this.max = max;
}public int getProgress() {
return progress;
}public void setProgress(int progress) {
this.progress = progress;
}//测量：获取当前视图宽高
@Override
protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) {
super.onMeasure(widthMeasureSpec, heightMeasureSpec);
width = this.getMeasuredWidth();
}//canvas:画布，对应着视图在布局中的范围区间。范围的左上顶点即为坐标原点
@Override
protected void onDraw(Canvas canvas) {
//1.绘制圆环
//获取圆心坐标
int cx = width / 2;
int cy = width / 2;
float radius = width / 2 - roundWidth / 2;
paint.setColor(roundColor);//设置画笔颜色
paint.setStyle(Paint.Style.STROKE);//设置圆环的样式
paint.setStrokeWidth(roundWidth);//设置圆环的宽度
canvas.drawCircle(cx, cy, radius, paint);//2.绘制圆弧 RectF rectF = new RectF(roundWidth / 2, roundWidth / 2, width - roundWidth / 2, width - roundWidth / 2); paint.setColor(roundProgressColor);//设置画笔颜色 canvas.drawArc(rectF,0,progress * 360 / max ,false,paint); //3.绘制文本 String text = progress * 100 / max + "%"; //设置paint paint.setColor(textColor); paint.setTextSize(textSize); paint.setStrokeWidth(0); Rect rect = new Rect();//创建了一个矩形，此时矩形没有具体的宽度和高度 paint.getTextBounds(text,0,text.length(),rect);//此时的矩形的宽度和高度即为整好包裹文本的矩形的宽高 //获取左下顶点的坐标 int x = width / 2 - rect.width() / 2; int y = width / 2 + rect.height() / 2; canvas.drawText(text,x,y,paint);}
}
···
MyApplication类
···
package com.example.progress;
import android.app.Application;
import android.content.Context;
import android.os.Handler;
/**
-
Created by shkstart on 2016/12/2 0002.
*/
public class MyApplication extends Application {//在整个应用执行过程中，需要提供的变量
public static Context context;//需要使用的上下文对象：application实例
public static Handler handler;//需要使用的handler
public static Thread mainThread;//提供主线程对象
public static int mainThreadId;//提供主线程对象的id@Override
public void onCreate() {
super.onCreate();context = this.getApplicationContext(); handler = new Handler(); mainThread = Thread.currentThread();//实例化当前Application的线程即为主线程 mainThreadId = android.os.Process.myTid();//获取当前线程的id //设置未捕获异常的处理器
// CrashHandler.getInstance().init();
//初始化ShareSDK
}
}
···
UiUtils类
···
package com.example.progress;
import android.content.Context;
import android.os.Handler;
import android.view.View;
import android.widget.Toast;
/**
专门提供为处理一些UI相关的问题而创建的工具类，
-
提供资源获取的通用方法，避免每次都写重复的代码获取结果。
*/
public class UIUtils {public static Context getContext(){
return MyApplication.context;
}public static Handler getHandler(){
return MyApplication.handler;
}//返回指定colorId对应的颜色值
public static int getColor(int colorId){
return getContext().getResources().getColor(colorId);
}//加载指定viewId的视图对象，并返回
public static View getView(int viewId){
View view = View.inflate(getContext(), viewId, null);
return view;
}public static String[] getStringArr(int strArrId){
String[] stringArray = getContext().getResources().getStringArray(strArrId);
return stringArray;
}//将dp转化为px
public static int dp2px(int dp){
//获取手机密度
float density = getContext().getResources().getDisplayMetrics().density;
return (int) (dp * density + 0.5);//实现四舍五入
}public static int px2dp(int px){
//获取手机密度
float density = getContext().getResources().getDisplayMetrics().density;
return (int) (px / density + 0.5);//实现四舍五入
}//保证runnable中的操作在主线程中执行
public static void runOnUiThread(Runnable runnable) {
if(isInMainThread()){
runnable.run();
}else{
UIUtils.getHandler().post(runnable);
}
}
//判断当前线程是否是主线程
private static boolean isInMainThread() {
int currentThreadId = android.os.Process.myTid();
return MyApplication.mainThreadId == currentThreadId;}
public static void toast(String message,boolean isLengthLong){
Toast.makeText(UIUtils.getContext(), message,isLengthLong? Toast.LENGTH_LONG : Toast.LENGTH_SHORT).show();
}
}
···