Android中怎么自定义view实现圆环进度条效果

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核心代码

自定义view的属性

自定义view

package com.czhappy.ringprogressdemo.view;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.graphics.Typeface;import android.util.AttributeSet;import android.util.Log;import android.view.View;import com.czhappy.ringprogressdemo.R;/** * Description: * User: chenzheng * Date: 2017/2/10 0010 * Time: 15:11 */public class RingProgressBar extends View {    /**     * 画笔对象的引用     */    private Paint ringPaint;    private Paint ringProgressPaint;    private Paint txtPaint;    /**     * 圆环的颜色     */    private int ringColor;    /**     * 圆环进度的颜色     */    private int ringProgressColor;    /**     * 中间进度百分比的字符串的颜色     */    private int textColor;    /**     * 中间进度百分比的字符串的字体     */    private float textSize;    /**     * 圆环的宽度     */    private float ringWidth;    /**     * 最大进度     */    private int max;    /**     * 当前进度     */    private int progress;    /**     * 是否显示中间的进度     */    private boolean textIsDisplayable;    private Context mContext;    /**     * 进度的风格，实心或者空心     */    private int style;    public static final int STROKE = 0;    public static final int FILL = 1;    public RingProgressBar(Context context) {        this(context, null);    }    public RingProgressBar(Context context, AttributeSet attrs) {        this(context, attrs, 0);    }    public RingProgressBar(Context context, AttributeSet attrs, int defStyleAttr) {        super(context, attrs, defStyleAttr);        this.mContext = context;        // 获取自定义的属性        initAttrs(context, attrs);        initPaint();    }    private void initAttrs(Context context, AttributeSet attrs) {        TypedArray mTypedArray = context.obtainStyledAttributes(attrs,                R.styleable.RingProgressBar);        //获取自定义属性和默认值        ringColor = mTypedArray.getColor(R.styleable.RingProgressBar_ringColor, Color.GRAY);        ringProgressColor = mTypedArray.getColor(R.styleable.RingProgressBar_ringProgressColor, Color.GREEN);        textColor = mTypedArray.getColor(R.styleable.RingProgressBar_textColor, Color.GREEN);        textSize = mTypedArray.getDimension(R.styleable.RingProgressBar_textSize, 16);        ringWidth = mTypedArray.getDimension(R.styleable.RingProgressBar_ringWidth, 5);        max = mTypedArray.getInteger(R.styleable.RingProgressBar_max, 100);        textIsDisplayable = mTypedArray.getBoolean(R.styleable.RingProgressBar_textIsDisplayable, true);        style = mTypedArray.getInt(R.styleable.RingProgressBar_style, 0);        //资源回收        mTypedArray.recycle();    }    /**     * 初始化画笔     */    private void initPaint() {        //圆环画笔        ringPaint = new Paint();        ringPaint.setColor(ringColor); //设置圆环的颜色        ringPaint.setStyle(Paint.Style.STROKE); //设置空心        ringPaint.setStrokeWidth(ringWidth); //设置圆环的宽度        ringPaint.setAntiAlias(true);  //消除锯齿        //圆环进度画笔        ringProgressPaint = new Paint();        ringProgressPaint.setColor(ringProgressColor); //设置圆环的颜色        ringProgressPaint.setStrokeWidth(ringWidth); //设置圆环的宽度        ringProgressPaint.setAntiAlias(true);  //消除锯齿        switch (style) {            case STROKE:                ringProgressPaint.setStyle(Paint.Style.STROKE);                break;            case FILL:                ringProgressPaint.setStyle(Paint.Style.FILL_AND_STROKE);                break;        }        //百分比文字画笔        txtPaint = new Paint();        txtPaint.setColor(textColor);        txtPaint.setTextSize(textSize);        txtPaint.setTypeface(Typeface.DEFAULT_BOLD); //设置字体    }    @Override    protected void onDraw(Canvas canvas) {        super.onDraw(canvas);        //圆心坐标        int mXCenter = getWidth() / 2;        int mYCenter = getHeight() / 2;        int radius = (int) (mXCenter - ringWidth / 2); //圆环的半径        //绘制圆环        canvas.drawCircle(mXCenter, mYCenter, radius, ringPaint);        //绘制圆环进度        RectF oval = new RectF(mXCenter - radius, mYCenter - radius, mXCenter                + radius, mYCenter + radius);  //用于定义的圆弧的形状和大小的界限        switch (style) {            case STROKE:                canvas.drawArc(oval, -90, 360 * progress / max, false, ringProgressPaint);  //根据进度画圆弧                break;            case FILL:                if (progress != 0)                    canvas.drawArc(oval, -90, 360 * progress / max, true, ringProgressPaint);  //根据进度画圆弧                break;        }        //绘制百分比数字        //文字绘制        String txt = progress  + "%";        //文字的长度        float mTxtWidth = txtPaint.measureText(txt, 0, txt.length());        Log.e("tag", textIsDisplayable+","+progress+(style==STROKE));        if(textIsDisplayable && progress!=0 && style==STROKE){            canvas.drawText(txt, mXCenter - mTxtWidth / 2, mYCenter+textSize/2, txtPaint);        }    }    public synchronized int getMax() {        return max;    }    /**     * 设置进度的最大值     * @param max     */    public synchronized void setMax(int max) {        if(max < 0){            throw new IllegalArgumentException("max not less than 0");        }        this.max = max;    }    /**     * 获取进度.需要同步     * @return     */    public synchronized int getProgress() {        return progress;    }    /**     * 设置进度，此为线程安全控件，由于考虑多线程的问题，需要同步     * 刷新界面调用postInvalidate()能在非UI线程刷新     * @param progress     */    public synchronized void setProgress(int progress) {        if(progress < 0){            throw new IllegalArgumentException("progress not less than 0");        }        if(progress > max){            progress = max;        }        if(progress <= max){            this.progress = progress;            postInvalidate();        }    }    public int getRingColor() {        return ringColor;    }    public void setRingColor(int ringColor) {        this.ringColor = ringColor;    }    public int getRingProgressColor() {        return ringProgressColor;    }    public void setRingProgressColor(int ringProgressColor) {        this.ringProgressColor = ringProgressColor;    }    public int getTextColor() {        return textColor;    }    public void setTextColor(int textColor) {        this.textColor = textColor;    }    public float getTextSize() {        return textSize;    }    public void setTextSize(float textSize) {        this.textSize = textSize;    }    public float getRingWidth() {        return ringWidth;    }    public void setRingWidth(float roundWidth) {        this.ringWidth = roundWidth;    }}

MainActivity.java

package com.czhappy.ringprogressdemo.activity;import android.os.Bundle;import android.support.v7.app.AppCompatActivity;import android.view.View;import com.czhappy.ringprogressdemo.R;import com.czhappy.ringprogressdemo.view.RingProgressBar;public class MainActivity extends AppCompatActivity {    private RingProgressBar myProgress;    @Override    protected void onCreate(Bundle savedInstanceState) {        super.onCreate(savedInstanceState);        setContentView(R.layout.activity_main);        myProgress = (RingProgressBar) findViewById(R.id.myProgress);    }    public void beginAnim(View view){        new Thread(){            @Override            public void run() {                super.run();                for(int i=0; i<=60; i++){                    try {                        Thread.sleep(20);                    } catch (InterruptedException e) {                        e.printStackTrace();                    }                    myProgress.setProgress(i);                }            }        }.start();    }}

布局文件

感谢各位的阅读，以上就是"Android中怎么自定义view实现圆环进度条效果"的内容了，经过本文的学习后，相信大家对Android中怎么自定义view实现圆环进度条效果这一问题有了更深刻的体会，具体使用情况还需要大家实践验证。这里是，小编将为大家推送更多相关知识点的文章，欢迎关注！