Android基础控件ProgressBar进度条的使用

1、简介

　　ProgressBar继承与View类，直接子类有AbsSeekBar和ContentLoadingProgressBar， 其中AbsSeekBar的子类有SeekBar和RatingBar！

android:max：进度条的最大值
android:progress：进度条已完成进度值
android:progressDrawable：设置轨道对应的Drawable对象
android:indeterminate：如果设置成true，则进度条不精确显示进度
android:indeterminateDrawable：设置不显示进度的进度条的Drawable对象
android:indeterminateDuration：设置不精确显示进度的持续时间
android:secondaryProgress：二级进度条

2、简单使用

　　头两个是系统自带，后面一个帧动画一个自定义View！

　　xml布局文件：

<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:gravity="center"
    android:orientation="vertical"
    android:paddingBottom="@dimen/activity_vertical_margin"
    android:paddingLeft="@dimen/activity_horizontal_margin"
    android:paddingRight="@dimen/activity_horizontal_margin"
    android:paddingTop="@dimen/activity_vertical_margin"
    tools:context=".LoginActivity">

        <ProgressBar
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            style="@android:style/Widget.ProgressBar.Large"/>
        <ProgressBar
            android:layout_width="match_parent"
            android:layout_height="wrap_content"
            android:max="100"
            android:progress="10"
            android:secondaryProgress="20"
            style="@android:style/Widget.ProgressBar.Horizontal"/>
        <ImageView
            android:id="@+id/imageview11"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:src="@drawable/amin_pgbar"/>
        <com.example.xianfengzhang.myapplication.CustomView.CirclePgBar
            android:layout_width="wrap_content"
            android:layout_height="wrap_content" />
</LinearLayout>

　　帧动画布局文件：

<?xml version="1.0" encoding="utf-8"?>
<animation-list xmlns:android="http://schemas.android.com/apk/res/android"
    android:oneshot="false" >

    <item
        android:drawable="@drawable/loading_01"
        android:duration="200"/>
    <item
        android:drawable="@drawable/loading_02"
        android:duration="200"/>
    <item
        android:drawable="@drawable/loading_03"
        android:duration="200"/>
    <item
        android:drawable="@drawable/loading_04"
        android:duration="200"/>
    <item
        android:drawable="@drawable/loading_05"
        android:duration="200"/>
    <item
        android:drawable="@drawable/loading_06"
        android:duration="200"/>
    <item
        android:drawable="@drawable/loading_07"
        android:duration="200"/>
    <item
        android:drawable="@drawable/loading_08"
        android:duration="200"/>
    <item
        android:drawable="@drawable/loading_09"
        android:duration="200"/>
    <item
        android:drawable="@drawable/loading_10"
        android:duration="200"/>
    <item
        android:drawable="@drawable/loading_11"
        android:duration="200"/>
    <item
        android:drawable="@drawable/loading_12"
        android:duration="200"/>
</animation-list>

　　帧动画Java文件：

public class LoginActivity extends AppCompatActivity  {

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_login);
        // Set up the login form.

        ImageView imageView = (ImageView)findViewById(R.id.imageview11);
        final AnimationDrawable animationDrawable = (AnimationDrawable)imageView.getDrawable();
        imageView.postDelayed(new Runnable() {
            @Override
            public void run() {
                animationDrawable.start();
            }
        },100);
    }
}

　　自定义View：

package com.example.xianfengzhang.myapplication.CustomView;

import android.annotation.SuppressLint;
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;

/**
 * Created by xianfengzhang on 2017/12/22.
 */

@SuppressLint("ViewConstructor")
public class CirclePgBar extends View {
    private Paint mBackPaint;
    private Paint mFrontPaint;
    private Paint mTextPaint;
    private float mStrokeWidth = 50;
    private float mHalfStrokeWidth = mStrokeWidth / 2;
    private float mRadius = 200;
    private RectF mRect;
    private int mProgress = 0;
    //目标值，想改多少就改多少
    private int mTargetProgress = 90;
    private int mMax = 100;
    private int mWidth;
    private int mHeight;

//    构造方法
    public CirclePgBar(Context context) {
        super(context);
        init();
    }
    public CirclePgBar(Context context, AttributeSet attrs) {
        super(context, attrs);
        init();
    }

    public CirclePgBar(Context context, AttributeSet attrs, int defStyleAttr) {
        super(context, attrs, defStyleAttr);
        init();
    }
    private  void init(){
        mBackPaint = new Paint();
        mBackPaint.setColor(Color.WHITE);//设置画笔颜色
        mBackPaint.setAntiAlias(true);//设置画笔锯齿效果
        mBackPaint.setStyle(Paint.Style.STROKE);//设置画笔风格（空心|实心）
        mBackPaint.setStrokeWidth(mStrokeWidth);//设置空心边框的宽度

        mFrontPaint = new Paint();
        mFrontPaint.setColor(Color.GREEN);
        mFrontPaint.setAntiAlias(true);
        mFrontPaint.setStyle(Paint.Style.STROKE);
        mFrontPaint.setStrokeWidth(mStrokeWidth);

        mTextPaint = new Paint();
        mTextPaint.setColor(Color.GREEN);//设置字体颜色
        mTextPaint.setAntiAlias(true);
        mTextPaint.setTextSize(80);//设置字体大小
        mTextPaint.setTextAlign(Paint.Align.CENTER);//设置字体对齐方式

    }

//onMeasure（测量控件大小的方法） 重写onMeasure方法
    @Override
    protected  void onMeasure(int widthMeasureSpec, int heightMeasureSpec){
        super.onMeasure(widthMeasureSpec, heightMeasureSpec);
        mWidth = getRealSize(widthMeasureSpec);
        mHeight = getRealSize(heightMeasureSpec);
        setMeasuredDimension(mWidth,mHeight);//保存测量的大小
    }
//onDraw绘制View自身的内容 重写onDraw方法
    @Override
    protected void onDraw(Canvas canvas){
        initRect();
        float angle = mProgress/(float)mMax *360;
        canvas.drawCircle(mWidth/2,mHeight/2,mRadius,mBackPaint);
        canvas.drawArc(mRect,-90,angle,false,mFrontPaint);
        canvas.drawText(mProgress + "%",mWidth/2+mHalfStrokeWidth,mHeight/2+mHalfStrokeWidth,mTextPaint);
        if (mProgress < mTargetProgress){
            mProgress +=1;
            invalidate();
        }
    }
    public int getRealSize(int measureSpec) {
        int result = 1;
        int mode = MeasureSpec.getMode(measureSpec);//从提供的测量规范中获取模式
        int size = MeasureSpec.getSize(measureSpec);//从提供的测量规范中获取尺寸
//MeasureSpec其实就是尺寸和模式通过各种位运算计算出的一个整型值，它提供了三种模式，还有三个方法（合成约束、分离模式、分离尺寸）
//UNSPECIFIED(未指定)：父控件没有对子控件施加任何约束，子控件可以得到任意想要的大小！
//EXACTLY(完全)：父控件给子控件决定了确切大小，子控件将被限定在给定的边界里而忽略它本身大小。
//AT_MOST(至多)：子控件至多达到指定大小的值。
        if (mode == MeasureSpec.AT_MOST || mode == MeasureSpec.UNSPECIFIED) {
            result = (int) (mRadius * 2 + mStrokeWidth);
        } else {
            result = size;
        }

        return result;
    }
    private void initRect() {
        if (mRect == null) {
            mRect = new RectF();
            int viewSize = (int) (mRadius * 2);
            int left = (mWidth - viewSize) / 2;
            int top = (mHeight - viewSize) / 2;
            int right = left + viewSize;
            int bottom = top + viewSize;
            mRect.set(left, top, right, bottom);
        }
    }
}