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POAndroid thread wait until visible
 

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    <p>I've made a custom pie chart view that I want to animate starting when the pie chart is visible. Currently what I have is the pie chart animating but by the time you can actually see it on the screen the animation is half over. This is what I have:</p> <pre><code>public class SinglePieChart extends SurfaceView implements SurfaceHolder.Callback { // Chart setting variables private int emptyCircleCol, strokeColor, number, total; // Paint for drawing custom view private Paint circlePaint; private RectF rect; private Context context; private AnimThread animThread; private SurfaceHolder holder; // animation variables private float speed; private float current = 0.0f; private boolean percentsCalculated = false; private float degree; private int viewWidth, viewHeight; public SinglePieChart(Context ctx, AttributeSet attrs) { super(ctx, attrs); context = ctx; // Paint object for drawing in doDraw circlePaint = new Paint(); circlePaint.setStyle(Style.STROKE); circlePaint.setStrokeWidth(3); circlePaint.setAntiAlias(true); circlePaint.setDither(true); rect = new RectF(); //get the attributes specified in attrs.xml using the name we included TypedArray a = context.getTheme().obtainStyledAttributes(attrs, R.styleable.DashboardChartSmall, 0, 0); try { //get the colors specified using the names in attrs.xml emptyCircleCol = a.getColor(R.styleable.DashboardChartSmall_smCircleColor, 0xFF65676E); // light gray is default strokeColor = a.getColor(R.styleable.DashboardChartSmall_smColor, 0xFF39B54A); // green is default // Default number values total = a.getInteger(R.styleable.DashboardChartSmall_smTotal, 1); number = a.getInteger(R.styleable.DashboardChartSmall_smNumber, 0); } finally { a.recycle(); } this.setZOrderOnTop(true); holder = getHolder(); holder.setFormat(PixelFormat.TRANSPARENT); holder.addCallback(this); } protected void calculateValues() { degree = 360 * number / total; percentsCalculated = true; speed = 10 * number / total; viewWidth = this.getMeasuredWidth(); viewHeight = this.getMeasuredHeight(); float top, left, bottom, right; if (viewWidth &lt; viewHeight) { left = 4; right = viewWidth - 4; top = ((viewHeight - viewWidth) / 2) + 4; bottom = viewHeight - top; } else { top = 4; bottom = viewHeight - 4; left = ((viewWidth - viewHeight) / 2) + 4; right = viewWidth - left; } rect.set(left, top, right, bottom); } protected void doDraw(Canvas canvas) { if (total == 0) { // Number values are not ready animThread.setRunning(false); return; } if (!percentsCalculated) { calculateValues(); } // set the paint color using the circle color specified float last = current; float start = -90; circlePaint.setColor(strokeColor); canvas.drawArc(rect, start, (last &gt; degree) ? degree : last, false, circlePaint); start += (last &gt; number) ? number : last; last = (last &lt; number) ? 0 : last - number; circlePaint.setColor(emptyCircleCol); if (current &gt; 360) { current = 360; } canvas.drawArc(rect, start, 360 - current, false, circlePaint); current += speed; if (last &gt; 0 || number == 0) { // we're done animThread.setRunning(false); } } public void setNumbers(int num, int tot) { number = num; total = tot; invalidate(); requestLayout(); } public void setColor(int col) { strokeColor = col; } public void redraw() { calculateValues(); animThread.setRunning(true); invalidate(); requestLayout(); } @Override public void surfaceChanged(SurfaceHolder arg0, int arg1, int arg2, int arg3) { } @Override public void surfaceCreated(SurfaceHolder arg0) { animThread = new AnimThread(holder, context, this); animThread.setRunning(true); animThread.start(); } @Override public void surfaceDestroyed(SurfaceHolder arg0) { animThread.setRunning(false); boolean retry = true; while(retry) { try { animThread.join(); retry = false; } catch(Exception e) { Log.v("Exception Occured", e.getMessage()); } } } public class AnimThread extends Thread { boolean mRun; Canvas mcanvas; SurfaceHolder surfaceHolder; Context context; SinglePieChart msurfacePanel; public AnimThread(SurfaceHolder sholder, Context ctx, SinglePieChart spanel) { surfaceHolder = sholder; context = ctx; mRun = false; msurfacePanel = spanel; } void setRunning(boolean bRun) { mRun = bRun; } @Override public void run() { super.run(); while (mRun) { mcanvas = surfaceHolder.lockCanvas(); if (mcanvas != null) { msurfacePanel.doDraw(mcanvas); surfaceHolder.unlockCanvasAndPost(mcanvas); } } } } } </code></pre> <p>Also if you see any programming errors, memory leaks, poor performing code, please let me know. I'm new to Android.</p> <p>Here is the layout that uses the SinglePieChart class:</p> <pre><code>&lt;?xml version="1.0" encoding="utf-8"?&gt; &lt;merge xmlns:android="http://schemas.android.com/apk/res/android"&gt; &lt;RelativeLayout android:layout_width="match_parent" android:layout_height="0dp" android:layout_weight="1"&gt; &lt;com.davidscoville.vokab.views.elements.SinglePieChart android:id="@+id/smallPieChart" android:layout_width="match_parent" android:layout_height="match_parent" /&gt; &lt;TextView android:id="@+id/dashSmNumber" android:layout_width="wrap_content" android:layout_height="wrap_content" android:layout_centerHorizontal="true" android:layout_centerVertical="true" android:textSize="25sp" android:textColor="#FFFFFF" /&gt; &lt;/RelativeLayout&gt; &lt;TextView android:id="@+id/dashSmLabel" android:layout_width="match_parent" android:layout_height="20dp" android:textSize="14sp" android:gravity="center" android:textColor="#FFFFFF" /&gt; &lt;/merge&gt; </code></pre>
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    2. CO"I've made a custom pie chart view that I want to animate starting when the pie chart is visible. Currently what I have is the pie chart animating but by the time you can actually see it on the screen the animation is half over."
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