这篇文章主要讲解了“Android中怎么自定义view实现圆环进度条效果”，文中的讲解内容简单清晰，易于学习与理解，下面请大家跟着小编的思路慢慢深入，一起来研究和学习“Android中怎么自定义view实现圆环进度条效果”吧！
核心代码
自定义view的属性
<?xml version="1.0" encoding="utf-8"?><resources> <declare-styleable name="RingProgressBar"> <attr name="ringColor" format="color" /> <attr name="ringProgressColor" format="color" /> <attr name="ringWidth" format="dimension"></attr> <attr name="textColor" format="color" /> <attr name="textSize" format="dimension" /> <attr name="max" format="integer"></attr> <attr name="textIsDisplayable" format="boolean"></attr> <attr name="style"> <enum name="STROKE" value="0"></enum> <enum name="FILL" value="1"></enum> </attr> </declare-styleable></resources>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;public class RingProgressBar extends View { private Paint ringPaint; private Paint ringProgressPaint; private Paint txtPaint; private int ringColor; private int ringProgressColor; private int textColor; private float textSize; private float ringWidth; private int max; private int progress; private boolean textIsDisplayable; private Context mContext; 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(); } 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; } public synchronized void setMax(int max) { if(max < 0){ throw new IllegalArgumentException("max not less than 0"); } this.max = max; } public synchronized int getProgress() { return 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
<?xml version="1.0" encoding="utf-8"?><LinearLayout xmlns:android="http://schemas.android.com/apk/res/android" xmlns:ring="http://schemas.android.com/apk/res-auto" android:id="@+id/activity_main" android:gravity="center_horizontal" android:layout_width="match_parent" android:layout_height="match_parent" android:orientation="vertical"> <Button android:layout_width="match_parent" android:onClick="beginAnim" android:layout_height="wrap_content" android:text="开始动画"/> <com.czhappy.ringprogressdemo.view.RingProgressBar android:id="@+id/myProgress" android:layout_width="100dp" android:layout_height="100dp" android:layout_marginTop="20dp" ring:ringColor="@color/ring_color" ring:ringProgressColor="@color/ring_progress_color" ring:textColor="@color/ring_progress_color" ring:textIsDisplayable="true" ring:ringWidth="6dp" ring:textSize="16sp"/></LinearLayout>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。这里是编程网，小编将为大家推送更多相关知识点的文章，欢迎关注！
