当前位置：首页 > 资讯 > 技术文档

Android仿微信清理内存图表动画（解决surfaceView屏幕闪烁问题）demo实例详解

时间：2021-09-10 08:58 编辑：来源：阅读：
扫一扫，手机访问

摘要：Android仿微信清理内存图表动画（解决surfaceView屏幕闪烁问题）demo实例详解

最近接了一个项目其中有功能要实现一个清理内存，要求和微信的效果一样。于是想到用surfaceView而不是继承view。下面小编给大家解析下实现思路。 surfaceView是为了解决频繁绘制动画产生了闪烁，而采用了双缓冲机制，即A、B两个缓冲轮流显示在画布上，同时，使用不当，同样容易产生闪烁，这是由于A、B中有一个缓冲没有改变。在我写这个view的时候就遇到了这个问题，研究了好久终于解决。 [b]首先说一下思路：[/b] [b]微信清理缓存的动画是：[/b] 一个圆环不停的转动，同时中间有文字显示-->加载完成后，出现一个慢慢展开的图标，同时第一块区域要突出一点。这就是微信的动画效果。但是具体实现是怎么样的呢？ [b]下面说一下我实现的方法：[/b] [b]1、旋转圆环：[/b] 这个圆环由两部分组成，一个圆和一个深灰的弧线，而弧线一直在转动，产生了圆环在旋转的效果。因此，这个就很好解决了。我们画两个图形，一个圆形，一个弧线，而弧线的角度不停的变化就产了旋转的效果。为了让它不断变化，就要用到一个动画类ValueAnimator,通过这个类不停的给出一个角度，然后我们不停的绘制，就可以完成这个效果。 [b]2、文字：[/b] 文字是和圆环是一部分的，当然他们其实应该同时绘制。但是每次绘制，为了避免文字的重叠，我们需要将canvas清除。我们通过计算出总的旋转动画时间和一个由绘制动画开始，到具体当前绘制时的时间差来模拟出百分比。 [b]3、会展开的图表：[/b] 这个是这个效果的难点部分，这里遇到的问题也比较多。这是一个慢慢展开的动画，看似是一个圆在慢慢显现，其实不是。只不过是一个扇形再不停的旋转，但是没有清除之前的画布，这样产生了平铺效果。而第一块区域的扇形较大只不过是半径大一点而已。因此这部分我们同样利用ValueAnimator，也可以画出。通过对第一个旋转动画进行监听，当第一个效果结束的时候，第二个图表的动画开始进行。 [b]4、具体的内存大小信息：[/b] 这个比较简单，只需要确定坐标即可，但是在写的时候也遇到了闪烁情况。 [b]下面是具体实现[/b] 最初版本：

package xiaoqi.expandablechartview; 
import android.animation.Animator; 
import android.animation.PropertyValuesHolder; 
import android.animation.ValueAnimator; 
import android.content.Context; 
import android.graphics.Canvas; 
import android.graphics.Color; 
import android.graphics.Paint; 
import android.graphics.PixelFormat; 
import android.graphics.PorterDuff; 
import android.graphics.RectF; 
import android.util.AttributeSet; 
import android.view.SurfaceHolder; 
import android.view.SurfaceView; 
import android.view.animation.LinearInterpolator; 
public class ChartView extends SurfaceView implements SurfaceHolder.Callback { 
private Context context; 
private SurfaceHolder holder; 
private ValueAnimator chartAnimator; 
private ValueAnimator circleAnimator; 
//中间内存信息方块的坐标 
private float centerDetailLeft; 
private float centerDetailTop; 
private float centerDetailRight; 
private float centerDetailBottom; 
//chart外接正方形坐标 
private float chartLeft; 
private float chartTop; 
private float chartRight; 
private float chartBottom; 
//起始角度 
private float startAngle = 270; 
//半径 
private float radius; 
//各区域角度 
private float area1Angle; 
private float area2Angle; 
//区域的量 
private float total; 
private float area1; 
private float area2; 
private long time; 
private int repeatCount = 2; 
//是否为第一次显示，用于防止surface闪烁 
private boolean area1IsFirstShow = true; 
private boolean area2IsFirstShow = true; 
//大扇形外接正方形 
private RectF rectF; 
//小扇形外接正方形 
private RectF rectF2; 
private Paint area1Paint; 
private Paint area2Paint; 
private Paint area3Paint; 
private Paint circlePaint; 
private Paint arcPaint; 
private Paint loadingPaint; 
private Paint textPaint; 
private static final int CIRCLE_DURATION = 1000; 
public ChartView(Context context) { 
super(context); 
this.context = context; 
init(); 
} 
public ChartView(Context context, AttributeSet attrs) { 
super(context, attrs); 
this.context = context; 
init(); 
} 
public ChartView(Context context, AttributeSet attrs, int defStyleAttr) { 
super(context, attrs, defStyleAttr); 
this.context = context; 
init(); 
} 
private void init() { 
radius = Utility.dip2px(context, 100); 
holder = getHolder(); 
holder.addCallback(this); 
setZOrderOnTop(true); 
holder.setFormat(PixelFormat.TRANSLUCENT); 
initPaint(); 
initAnimator(); 
} 
private void initAnimator() { 
PropertyValuesHolder angleValues = PropertyValuesHolder.ofFloat("angle", 0f, 360f); 
chartAnimator = ValueAnimator.ofPropertyValuesHolder(angleValues); 
chartAnimator.setDuration(2000); 
chartAnimator.setInterpolator(new LinearInterpolator()); 
chartAnimator.addUpdateListener(new ValueAnimator.AnimatorUpdateListener() { 
@Override 
public void onAnimationUpdate(ValueAnimator animation) { 
float angle = obj2Float(animation.getAnimatedValue("angle")); 
Canvas canvas = holder.lockCanvas(null); 
if(canvas != null){ 
// canvas.drawColor(Color.TRANSPARENT, PorterDuff.Mode.CLEAR); 
drawDetail(canvas); 
// canvas.setDrawFilter(new PaintFlagsDrawFilter(0, Paint.ANTI_ALIAS_FLAG | Paint.FILTER_BITMAP_FLAG)); 
// if (!area1IsFirstShow) { 
// canvas.drawArc(rectF, startAngle, area1Angle, true, area1Paint); 
// } 
// if (!area2IsFirstShow) { 
// canvas.drawArc(rectF2, area1Angle + startAngle, area2Angle, true, area2Paint); 
// } 
if (angle < area1Angle) { 
canvas.drawArc(rectF, startAngle, angle, true, area1Paint); 
} else if (angle <= area2Angle + area1Angle) { 
// if (area1IsFirstShow) { 
// area1IsFirstShow = false; 
// canvas.drawArc(rectF, startAngle, area1Angle, true, area1Paint); 
// } else { 
canvas.drawArc(rectF2, startAngle+area1Angle, angle - area1Angle, true, area2Paint); 
// } 
} else { 
// if (area2IsFirstShow) { 
// area2IsFirstShow = false; 
// canvas.drawArc(rectF2, area1Angle + startAngle, area2Angle, true, area2Paint); 
// } else { 
canvas.drawArc(rectF2, startAngle + area1Angle + area2Angle, angle - area2Angle - area1Angle, 
true, area3Paint); 
// } 
} 
holder.unlockCanvasAndPost(canvas); 
} 
} 
}); 
circleAnimator = ValueAnimator.ofPropertyValuesHolder(angleValues); 
circleAnimator.setInterpolator(new LinearInterpolator()); 
circleAnimator.setDuration(CIRCLE_DURATION); 
circleAnimator.addUpdateListener(new ValueAnimator.AnimatorUpdateListener() { 
@Override 
public void onAnimationUpdate(ValueAnimator animation) { 
float angle = obj2Float(animation.getAnimatedValue("angle")); 
Canvas canvas = holder.lockCanvas(null); 
if(canvas != null){ 
long nowTime = System.currentTimeMillis(); 
int rate = (int) (nowTime - time) / (CIRCLE_DURATION * (repeatCount + 1) / 100); 
if (rate <= 100) { 
canvas.drawColor(Color.TRANSPARENT, PorterDuff.Mode.CLEAR); 
canvas.drawText("正在加载" + rate + "%", getMeasuredWidth() / 2 - radius / 2, 
getMeasuredHeight() / 2, loadingPaint); 
} 
canvas.drawCircle(getMeasuredWidth() / 2, getMeasuredHeight() / 2 - Utility.dip2px(context, 10), 
radius, circlePaint); 
canvas.drawArc(rectF2, 180 + angle, 30, false, arcPaint); 
holder.unlockCanvasAndPost(canvas); 
} 
} 
}); 
circleAnimator.addListener(new Animator.AnimatorListener() { 
@Override 
public void onAnimationStart(Animator animation) { 
time = System.currentTimeMillis(); 
} 
@Override 
public void onAnimationEnd(Animator animation) { 
chartAnimator.start(); 
} 
@Override 
public void onAnimationCancel(Animator animation) { 
} 
@Override 
public void onAnimationRepeat(Animator animation) { 
} 
}); 
} 
private void initPaint() { 
area1Paint = new Paint(); 
area1Paint.setAntiAlias(true); 
area1Paint.setStyle(Paint.Style.FILL); 
area1Paint.setTextSize((Utility.dip2px(context, 15))); 
area1Paint.setColor(context.getResources().getColor(R.color.background_blue)); 
area2Paint = new Paint(); 
area2Paint.setAntiAlias(true); 
area2Paint.setStyle(Paint.Style.FILL); 
area2Paint.setTextSize((Utility.dip2px(context, 15))); 
area2Paint.setColor(context.getResources().getColor(R.color.chart_blue)); 
area3Paint = new Paint(); 
area3Paint.setAntiAlias(true); 
area3Paint.setStyle(Paint.Style.FILL); 
area3Paint.setTextSize((Utility.dip2px(context, 15))); 
area3Paint.setColor(context.getResources().getColor(R.color.light_gary)); 
circlePaint = new Paint(); 
circlePaint.setAntiAlias(true); 
circlePaint.setStrokeWidth(Utility.dip2px(context, 5)); 
circlePaint.setStyle(Paint.Style.STROKE); 
circlePaint.setColor(context.getResources().getColor(R.color.background_gray)); 
arcPaint = new Paint(); 
arcPaint.setAntiAlias(true); 
arcPaint.setStrokeWidth(Utility.dip2px(context, 5)); 
arcPaint.setStyle(Paint.Style.STROKE); 
arcPaint.setColor(context.getResources().getColor(R.color.textcolor_gray)); 
loadingPaint = new Paint(); 
loadingPaint.setTextSize((Utility.dip2px(context, 15))); 
loadingPaint.setColor(context.getResources().getColor(R.color.textcolor_gray)); 
textPaint = new Paint(); 
textPaint.setTextSize((Utility.dip2px(context, 15))); 
textPaint.setColor(context.getResources().getColor(R.color.black)); 
} 
private float obj2Float(Object o) { 
return ((Number) o).floatValue(); 
} 
@Override 
protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) { 
super.onMeasure(widthMeasureSpec, heightMeasureSpec); 
chartLeft = getMeasuredWidth() / 2 - radius; 
chartTop = getMeasuredHeight() / 2 - radius - Utility.dip2px(context, 10); 
chartRight = getMeasuredWidth() / 2 + radius; 
chartBottom = getMeasuredHeight() / 2 + radius - Utility.dip2px(context, 10); 
centerDetailLeft = getMeasuredWidth() / 2 - Utility.dip2px(context, 20); 
centerDetailTop = getMeasuredHeight() / 2 + radius + Utility.dip2px(context, 15); 
centerDetailRight = getMeasuredWidth() / 2; 
centerDetailBottom = getMeasuredHeight() / 2 + radius + Utility.dip2px(context, 35); 
} 
@Override 
protected void onDraw(Canvas canvas) { 
super.onDraw(canvas); 
} 
@Override 
public void surfaceCreated(SurfaceHolder holder) { 
rectF = new RectF(chartLeft - Utility.dip2px(context, 5), chartTop - Utility.dip2px(context, 5), chartRight + 
Utility.dip2px(context, 5), chartBottom + Utility.dip2px(context, 5)); 
rectF2 = new RectF(chartLeft, chartTop, chartRight, chartBottom); 
// valueAnimator.start(); 
} 
@Override 
public void surfaceChanged(SurfaceHolder holder, int format, int width, int height) { 
} 
@Override 
public void surfaceDestroyed(SurfaceHolder holder) { 
circleAnimator.cancel(); 
chartAnimator.cancel(); 
} 
private void drawDetail(Canvas canvas) { 
canvas.drawRect(centerDetailLeft - Utility.dip2px(context, 150), centerDetailTop, 
centerDetailRight - Utility.dip2px(context, 150), centerDetailBottom, area1Paint); 
canvas.drawRect(centerDetailLeft, centerDetailTop, centerDetailRight, centerDetailBottom, area2Paint); 
canvas.drawRect(centerDetailLeft + Utility.dip2px(context, 150), centerDetailTop, 
centerDetailRight + Utility.dip2px(context, 150), centerDetailBottom, area3Paint); 
drawText(canvas); 
} 
private void drawText(Canvas canvas) { 
canvas.drawText("本软件", centerDetailRight - Utility.dip2px(context, 150) + Utility.dip2px(context, 5), 
centerDetailTop + Utility.dip2px(context, 10), area1Paint); 
canvas.drawText("200MB", centerDetailRight - Utility.dip2px(context, 150) + Utility.dip2px(context, 5), 
centerDetailTop + Utility.dip2px(context, 25), textPaint); 
canvas.drawText("其他", centerDetailRight + Utility.dip2px(context, 5), 
centerDetailTop + Utility.dip2px(context, 10), area2Paint); 
canvas.drawText("24.1GB", centerDetailRight + Utility.dip2px(context, 5), 
centerDetailTop + Utility.dip2px(context, 25), textPaint); 
canvas.drawText("可用", centerDetailRight + Utility.dip2px(context, 150) + Utility.dip2px(context, 5), 
centerDetailTop + Utility.dip2px(context, 10), area3Paint); 
canvas.drawText("30GB", centerDetailRight + Utility.dip2px(context, 150) + Utility.dip2px(context, 5), 
centerDetailTop + Utility.dip2px(context, 25), textPaint); 
} 
public void show() { 
circleAnimator.setRepeatCount(repeatCount); 
circleAnimator.start(); 
} 
public void setArea1Color(int color) { 
area1Paint.setColor(color); 
} 
public void setArea2Color(int color) { 
area2Paint.setColor(color); 
} 
public void setArea3Color(int color) { 
area3Paint.setColor(color); 
} 
public void setRadius(float radius) { 
this.radius = radius; 
} 
public void setScale(float total, float area1, float area2){ 
area1Angle = area1/total * 360; 
area2Angle = area2/total * 360; 
} 
public void setRepeatCount(int repeatCount){ 
this.repeatCount = repeatCount; 
} 
}

[b]效果：[/b] [b][img]http://files.jb51.net/file_images/article/201609/201694104849555.gif?20168410497[/img] [/b] 模仿微信的效果基本显示出来了，但是当区域改变的时候，会不停闪烁，其实下面标注信息的小正方形也在闪烁，只不过我已经修改好了。查了网上许多方法都没有给出一个很直接的答案，大部分都是说要对surfaceView前后缓存都进行绘制，这样就不产生闪烁问题。还有一种方法就是通过背景覆盖，让A缓冲在该区域的背景与B缓冲相同，这样自然而然切换的时候，就不会看到缓存交替而产生的闪烁问题了。关于第一种，我并不是很理解，说是每次要改变前后两个缓冲，不能只变一个。。。。。。（网上都是这么说，但是我到底怎么改才算改！！？）第二种方法，我经过了多次尝试实现了，通过切换画笔之后，每次画图都覆盖上一层，这样保持了之前闪烁部分的缓存一致。 [b]该部分为找到的一些资料：[/b] [b]双缓存(Double-buffer)与黑屏闪烁[/b] 每个SurfaceView 对象有两个独立的graphic buffer，官方SDK将它们称作"front buffer"和"back buffer"。常规的"double-buffer"会这么做：每一帧的数据都被绘制到back buffer，然后back buffer的内容被持续翻转(flip)到front buffer；屏幕一直显示front buffer。但Android SurfaceView的"double-buffer"却是这么做的：在buffer A里绘制内容，然后让屏幕显示buffer A; 下一个循环，在buffer B里绘制内容，然后让屏幕显示buffer B; 如此往复。于是，屏幕上显示的内容依次来自buffer A, B, A, B,....这样看来，两个buffer其实没有主从的分别，与其称之为"front buffer""back buffer"，毋宁称之为"buffer A""buffer B"。 Android中"double-buffer"的实现机制，可以很好地解释闪屏现象。在第一个"lockCanvas-drawCanvas-unlockCanvasAndPost"循环中，更新的是buffer A的内容；到下一个"lockCanvas-drawCanvas-unlockCanvasAndPost"循环中，更新的是buffer B的内容。如果buffer A与buffer B中某个buffer内容为空，当屏幕轮流显示它们时，就会出现画面黑屏闪烁现象。 [b]解决方法[/b] 出现黑屏是因为buffer A与buffer B中一者内容为空，而且为空的一方还被post到了屏幕。于是有两种解决思路：不让空buffer出现：每次向一个buffer写完内容并post之后，顺便用这个buffer的内容填充另一个buffer。这样能保证两个buffer的内容是同步的，缺点是做了无用功，耗费性能。不post空buffer到屏幕：当准备更新内容时，先判断内容是否为空，只有非空时才启动"lockCanvas-drawCanvas-unlockCanvasAndPost"这个流程。就好比，A缓存是白色，B缓冲是黑色（也就是前后surfaceView的缓存）。而黑色是surfaceView的默认色。比如下面的伪代码，通过线程不停的绘制：

canvas = holder.lockCanvas(); 
if(flag) { 
canvas.drawColor(Color.WHITE); 
} 
holder.unlockCanvasAndPost(canvas); 
flag = false;

看似没有什么问题，但是在实际过程却一直在黑白闪烁，这就是因为，虽然A我们每次都绘制了，但是B一直没变还是黑色。这时，我们通过覆盖，讲背景变为白色，就解决了这个问题，而我的解决方法也类似于这种。下面贴出代码：

package xiaoqi.expandablechartview; 
import android.animation.Animator; 
import android.animation.PropertyValuesHolder; 
import android.animation.ValueAnimator; 
import android.content.Context; 
import android.graphics.Canvas; 
import android.graphics.Color; 
import android.graphics.Paint; 
import android.graphics.PixelFormat; 
import android.graphics.PorterDuff; 
import android.graphics.RectF; 
import android.util.AttributeSet; 
import android.view.SurfaceHolder; 
import android.view.SurfaceView; 
import android.view.animation.LinearInterpolator; 
public class ChartView extends SurfaceView implements SurfaceHolder.Callback { 
private Context context; 
private SurfaceHolder holder; 
private ValueAnimator chartAnimator; 
private ValueAnimator circleAnimator; 
//中间内存信息方块的坐标 
private float centerDetailLeft; 
private float centerDetailTop; 
private float centerDetailRight; 
private float centerDetailBottom; 
//chart外接正方形坐标 
private float chartLeft; 
private float chartTop; 
private float chartRight; 
private float chartBottom; 
//起始角度 
private float startAngle = 270; 
//半径 
private float radius; 
//各区域角度 
private float area1Angle; 
private float area2Angle; 
//区域的量 
private float total; 
private float area1; 
private float area2; 
private long time; 
private int repeatCount = 2; 
//是否为第一次显示，用于防止surface闪烁 
private boolean area1IsFirstShow = true; 
private boolean area2IsFirstShow = true; 
//大扇形外接正方形 
private RectF rectF; 
//小扇形外接正方形 
private RectF rectF2; 
private Paint area1Paint; 
private Paint area2Paint; 
private Paint area3Paint; 
private Paint circlePaint; 
private Paint arcPaint; 
private Paint loadingPaint; 
private Paint textPaint; 
private static final int CIRCLE_DURATION = 1000; 
public ChartView(Context context) { 
super(context); 
this.context = context; 
init(); 
} 
public ChartView(Context context, AttributeSet attrs) { 
super(context, attrs); 
this.context = context; 
init(); 
} 
public ChartView(Context context, AttributeSet attrs, int defStyleAttr) { 
super(context, attrs, defStyleAttr); 
this.context = context; 
init(); 
} 
private void init() { 
radius = Utility.dip2px(context, 100); 
holder = getHolder(); 
holder.addCallback(this); 
setZOrderOnTop(true); 
holder.setFormat(PixelFormat.TRANSLUCENT); 
initPaint(); 
initAnimator(); 
} 
private void initAnimator() { 
PropertyValuesHolder angleValues = PropertyValuesHolder.ofFloat("angle", 0f, 360f); 
chartAnimator = ValueAnimator.ofPropertyValuesHolder(angleValues); 
chartAnimator.setDuration(2000); 
chartAnimator.setInterpolator(new LinearInterpolator()); 
chartAnimator.addUpdateListener(new ValueAnimator.AnimatorUpdateListener() { 
@Override 
public void onAnimationUpdate(ValueAnimator animation) { 
float angle = obj2Float(animation.getAnimatedValue("angle")); 
Canvas canvas = holder.lockCanvas(null); 
if(canvas != null){ 
canvas.drawColor(Color.TRANSPARENT, PorterDuff.Mode.CLEAR); 
drawDetail(canvas); 
// canvas.setDrawFilter(new PaintFlagsDrawFilter(0, Paint.ANTI_ALIAS_FLAG | Paint.FILTER_BITMAP_FLAG)); 
if (!area1IsFirstShow) { 
canvas.drawArc(rectF, startAngle, area1Angle, true, area1Paint); 
} 
if (!area2IsFirstShow) { 
canvas.drawArc(rectF2, area1Angle + startAngle, area2Angle, true, area2Paint); 
} 
if (angle < area1Angle) { 
canvas.drawArc(rectF, startAngle, angle, true, area1Paint); 
} else if (angle <= area2Angle + area1Angle) { 
if (area1IsFirstShow) { 
area1IsFirstShow = false; 
canvas.drawArc(rectF, startAngle, area1Angle, true, area1Paint); 
} else { 
canvas.drawArc(rectF2, startAngle+area1Angle, angle - area1Angle, true, area2Paint); 
} 
} else { 
if (area2IsFirstShow) { 
area2IsFirstShow = false; 
canvas.drawArc(rectF2, area1Angle + startAngle, area2Angle, true, area2Paint); 
} else { 
canvas.drawArc(rectF2, startAngle + area1Angle + area2Angle, angle - area2Angle - area1Angle, 
true, area3Paint); 
} 
} 
holder.unlockCanvasAndPost(canvas); 
} 
} 
}); 
circleAnimator = ValueAnimator.ofPropertyValuesHolder(angleValues); 
circleAnimator.setInterpolator(new LinearInterpolator()); 
circleAnimator.setDuration(CIRCLE_DURATION); 
circleAnimator.addUpdateListener(new ValueAnimator.AnimatorUpdateListener() { 
@Override 
public void onAnimationUpdate(ValueAnimator animation) { 
float angle = obj2Float(animation.getAnimatedValue("angle")); 
Canvas canvas = holder.lockCanvas(null); 
if(canvas != null){ 
long nowTime = System.currentTimeMillis(); 
int rate = (int) (nowTime - time) / (CIRCLE_DURATION * (repeatCount + 1) / 100); 
if (rate <= 100) { 
canvas.drawColor(Color.TRANSPARENT, PorterDuff.Mode.CLEAR); 
canvas.drawText("正在加载" + rate + "%", getMeasuredWidth() / 2 - radius / 2, 
getMeasuredHeight() / 2, loadingPaint); 
} 
canvas.drawCircle(getMeasuredWidth() / 2, getMeasuredHeight() / 2 - Utility.dip2px(context, 10), 
radius, circlePaint); 
canvas.drawArc(rectF2, 180 + angle, 30, false, arcPaint); 
holder.unlockCanvasAndPost(canvas); 
} 
} 
}); 
circleAnimator.addListener(new Animator.AnimatorListener() { 
@Override 
public void onAnimationStart(Animator animation) { 
time = System.currentTimeMillis(); 
} 
@Override 
public void onAnimationEnd(Animator animation) { 
chartAnimator.start(); 
} 
@Override 
public void onAnimationCancel(Animator animation) { 
} 
@Override 
public void onAnimationRepeat(Animator animation) { 
} 
}); 
} 
private void initPaint() { 
area1Paint = new Paint(); 
area1Paint.setAntiAlias(true); 
area1Paint.setStyle(Paint.Style.FILL); 
area1Paint.setTextSize((Utility.dip2px(context, 15))); 
area1Paint.setColor(context.getResources().getColor(R.color.background_blue)); 
area2Paint = new Paint(); 
area2Paint.setAntiAlias(true); 
area2Paint.setStyle(Paint.Style.FILL); 
area2Paint.setTextSize((Utility.dip2px(context, 15))); 
area2Paint.setColor(context.getResources().getColor(R.color.chart_blue)); 
area3Paint = new Paint(); 
area3Paint.setAntiAlias(true); 
area3Paint.setStyle(Paint.Style.FILL); 
area3Paint.setTextSize((Utility.dip2px(context, 15))); 
area3Paint.setColor(context.getResources().getColor(R.color.light_gary)); 
circlePaint = new Paint(); 
circlePaint.setAntiAlias(true); 
circlePaint.setStrokeWidth(Utility.dip2px(context, 5)); 
circlePaint.setStyle(Paint.Style.STROKE); 
circlePaint.setColor(context.getResources().getColor(R.color.background_gray)); 
arcPaint = new Paint(); 
arcPaint.setAntiAlias(true); 
arcPaint.setStrokeWidth(Utility.dip2px(context, 5)); 
arcPaint.setStyle(Paint.Style.STROKE); 
arcPaint.setColor(context.getResources().getColor(R.color.textcolor_gray)); 
loadingPaint = new Paint(); 
loadingPaint.setTextSize((Utility.dip2px(context, 15))); 
loadingPaint.setColor(context.getResources().getColor(R.color.textcolor_gray)); 
textPaint = new Paint(); 
textPaint.setTextSize((Utility.dip2px(context, 15))); 
textPaint.setColor(context.getResources().getColor(R.color.black)); 
} 
private float obj2Float(Object o) { 
return ((Number) o).floatValue(); 
} 
@Override 
protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) { 
super.onMeasure(widthMeasureSpec, heightMeasureSpec); 
chartLeft = getMeasuredWidth() / 2 - radius; 
chartTop = getMeasuredHeight() / 2 - radius - Utility.dip2px(context, 10); 
chartRight = getMeasuredWidth() / 2 + radius; 
chartBottom = getMeasuredHeight() / 2 + radius - Utility.dip2px(context, 10); 
centerDetailLeft = getMeasuredWidth() / 2 - Utility.dip2px(context, 20); 
centerDetailTop = getMeasuredHeight() / 2 + radius + Utility.dip2px(context, 15); 
centerDetailRight = getMeasuredWidth() / 2; 
centerDetailBottom = getMeasuredHeight() / 2 + radius + Utility.dip2px(context, 35); 
} 
@Override 
protected void onDraw(Canvas canvas) { 
super.onDraw(canvas); 
} 
@Override 
public void surfaceCreated(SurfaceHolder holder) { 
rectF = new RectF(chartLeft - Utility.dip2px(context, 5), chartTop - Utility.dip2px(context, 5), chartRight + 
Utility.dip2px(context, 5), chartBottom + Utility.dip2px(context, 5)); 
rectF2 = new RectF(chartLeft, chartTop, chartRight, chartBottom); 
// valueAnimator.start(); 
} 
@Override 
public void surfaceChanged(SurfaceHolder holder, int format, int width, int height) { 
} 
@Override 
public void surfaceDestroyed(SurfaceHolder holder) { 
circleAnimator.cancel(); 
chartAnimator.cancel(); 
} 
private void drawDetail(Canvas canvas) { 
canvas.drawRect(centerDetailLeft - Utility.dip2px(context, 150), centerDetailTop, 
centerDetailRight - Utility.dip2px(context, 150), centerDetailBottom, area1Paint); 
canvas.drawRect(centerDetailLeft, centerDetailTop, centerDetailRight, centerDetailBottom, area2Paint); 
canvas.drawRect(centerDetailLeft + Utility.dip2px(context, 150), centerDetailTop, 
centerDetailRight + Utility.dip2px(context, 150), centerDetailBottom, area3Paint); 
drawText(canvas); 
} 
private void drawText(Canvas canvas) { 
canvas.drawText("本软件", centerDetailRight - Utility.dip2px(context, 150) + Utility.dip2px(context, 5), 
centerDetailTop + Utility.dip2px(context, 10), area1Paint); 
canvas.drawText("200MB", centerDetailRight - Utility.dip2px(context, 150) + Utility.dip2px(context, 5), 
centerDetailTop + Utility.dip2px(context, 25), textPaint); 
canvas.drawText("其他", centerDetailRight + Utility.dip2px(context, 5), 
centerDetailTop + Utility.dip2px(context, 10), area2Paint); 
canvas.drawText("24.1GB", centerDetailRight + Utility.dip2px(context, 5), 
centerDetailTop + Utility.dip2px(context, 25), textPaint); 
canvas.drawText("可用", centerDetailRight + Utility.dip2px(context, 150) + Utility.dip2px(context, 5), 
centerDetailTop + Utility.dip2px(context, 10), area3Paint); 
canvas.drawText("30GB", centerDetailRight + Utility.dip2px(context, 150) + Utility.dip2px(context, 5), 
centerDetailTop + Utility.dip2px(context, 25), textPaint); 
} 
public void show() { 
circleAnimator.setRepeatCount(repeatCount); 
circleAnimator.start(); 
} 
public void setArea1Color(int color) { 
area1Paint.setColor(color); 
} 
public void setArea2Color(int color) { 
area2Paint.setColor(color); 
} 
public void setArea3Color(int color) { 
area3Paint.setColor(color); 
} 
public void setRadius(float radius) { 
this.radius = radius; 
} 
public void setScale(float total, float area1, float area2){ 
area1Angle = area1/total * 360; 
area2Angle = area2/total * 360; 
} 
public void setRepeatCount(int repeatCount){ 
this.repeatCount = repeatCount; 
} 
}

效果： [img]http://files.jb51.net/file_images/article/201609/201694104931072.gif?201684104947[/img] 同时建议每个图形都用自己的paint，而不是通过重新set不同设置来调用paint，因为在使用时，我发现，因为很多地方用的是同一个paint也导致了闪烁，而为每个图形都创建了自己的paint之后就好了。以上所述是小编给大家介绍的Android仿微信清理内存图表动画（解决surfaceView屏幕闪烁问题）demo实例详解，希望对大家有所帮助，如果大家有任何疑问请给我留言，小编会及时回复大家的。在此也非常感谢大家对编程素材网网站的支持！

全部评论(0)

上一篇：WindowManagerService服务是如何以堆栈的形式来组织窗口
下一篇：android开发实践之ndk编译命令简单示例

资讯排行榜
更多>>