Android自定义进度条的简单使用

实现如图所示：

代码如下：

1、SimpleView2

package com.example.testdialog;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 androidx.annotation.Nullable;public class SimpleView2 extends View {    //画笔    private Paint mPaint;    private int progress;//进度    private int bgcolor;//背景颜色    private int procolor;//进度颜色    // view的宽度    private int mWidth;    // view的高度    private int mHeight;    public SimpleView2(Context context) {        this(context,null);    }    public SimpleView2(Context context, @Nullable AttributeSet attrs) {        super(context, attrs);        initAttrs(attrs);        //初始化画笔        mPaint=new Paint();    }    private void initAttrs(AttributeSet attrs){        if(attrs==null){            return;        }        mWidth=400;        mHeight=30;        //获得所有的属性        TypedArray array=getContext().obtainStyledAttributes(attrs,R.styleable.SimpleView2);        progress=array.getInteger(R.styleable.SimpleView2_progress,0);        bgcolor=array.getColor(R.styleable.SimpleView2_bgcolor, Color.GRAY);        procolor=array.getColor(R.styleable.SimpleView2_procolor,Color.CYAN);        array.recycle();//回收TypedArray    }    /** View在绘制View之前，会先调用onMeasure方法去设置View的宽和高     * 当你设置组件宽度为match_parent时，发现组件没法自动适配屏幕宽度。     * 为了让组件能够满足我们适应屏幕宽高的需求，我们需要在onMeasure方法中对组件进行根据模式测量宽高：     * @param widthMeasureSpec     * @param heightMeasureSpec     */    @Override    protected void onMeasure(int widthMeasureSpec,int heightMeasureSpec){        int widthMode=MeasureSpec.getMode(widthMeasureSpec);        int width=MeasureSpec.getSize(widthMeasureSpec);        int heightMode=MeasureSpec.getMode(heightMeasureSpec);        int height=MeasureSpec.getSize(widthMeasureSpec);        int temp=measureSize(widthMode,width);        mWidth=temp==0?mWidth:temp;        temp=measureSize(heightMode,height);        mHeight=temp==0?mHeight:temp;        setMeasuredDimension(mWidth,mHeight);    }    private int measureSize(int mode,int defsize){        int size=0;        switch (mode){            case MeasureSpec.UNSPECIFIED:            case MeasureSpec.AT_MOST:                break;            case MeasureSpec.EXACTLY:                size=defsize;                break;        }        return size;    }    /**     * 在onDraw方法中绘制我们需要的进度条     * @param canvas     */    @Override    protected void onDraw(Canvas canvas){        mPaint.setColor(bgcolor);//设置进度条背景颜色        RectF rectF=new RectF();//背景的矩形        rectF.set(3,3,mWidth-3,mHeight-3);        canvas.drawRoundRect(rectF,3,3,mPaint);        mPaint.setColor(procolor);        RectF proRect=new RectF();//进度的矩形        proRect.set(3,3,mWidth*((float)progress/100),mHeight-3);        canvas.drawRoundRect(proRect,3,3,mPaint);    }    /**     * 设置进度条的进度     * @param progress     */    public void setProgress(int progress){        if(progress<0||progress>100){            return;        }        this.progress=progress;        //重绘组件        postInvalidate();    }}

2、MainActivity

package com.example.testdialog;import androidx.appcompat.app.AppCompatActivity;import android.os.Bundle;import android.os.Handler;import android.os.Message;public class MainActivity extends AppCompatActivity {    private SimpleView2 simpleView2;    @Override    protected void onCreate(Bundle savedInstanceState) {        super.onCreate(savedInstanceState);        setContentView(R.layout.activity_main);        simpleView2=findViewById(R.id.progress);        new Thread(new Runnable() {            int progress=0;            @Override            public void run() {                while(progress<100) {                    try {                        Thread.sleep(1000);                    } catch (InterruptedException e) {                        e.printStackTrace();                    }                    progress += 10;                    if(progress==100){                        progress = 0;                    }                    Message msg = handler.obtainMessage();                    msg.what = progress;                    handler.sendMessage(msg);                }            }        }).start();    }    Handler handler=new Handler(){        @Override        public void handleMessage(Message msg){            int progress=msg.what;            simpleView2.setProgress(progress);        }    };}

3、在value目录建立attrs.xml

<?xml version="1.0" encoding="utf-8"?><resources>    <declare-styleable name="SimpleView2">        <attr name="progress" format="integer"/>        <attr name="bgcolor" format="color"/>        <attr name="procolor" format="color"/>    </declare-styleable></resources>

4、布局

<?xml version="1.0" encoding="utf-8"?><RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"    xmlns:app="http://schemas.android.com/apk/res-auto"    xmlns:tools="http://schemas.android.com/tools"    android:layout_width="match_parent"    android:layout_height="match_parent">    <com.example.testdialog.SimpleView2        android:id="@+id/progress"        android:layout_width="match_parent"        android:layout_height="wrap_content"        android:layout_centerInParent="true"        app:progress="0" /></RelativeLayout>

实现如图所示：

代码如下：

1、SimpleView2

2、MainActivity

3、在value目录建立attrs.xml

4、布局

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