我处于一种情况,我想在一段时间内逐一画线.我试图通过使用thread来做到这一点.但它对我没用.
目标是我有5行.这些行应该一个接一个地绘制,延迟时间为5秒.在onDraw()方法中使用Thread.sleep(5000)但是在5秒后绘制了所有行,这些行不是定期绘制的…我如何定期绘制线…
代码片段::
public class PaintDemoActivity extends Activity {
DragView drawView;
/** Called when the activity is first created. */
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
getWindow().setFlags(WindowManager.LayoutParams.FLAG_FULLSCREEN,
WindowManager.LayoutParams.FLAG_FULLSCREEN);
requestWindowFeature(Window.FEATURE_NO_TITLE);
drawView = new DragView(this);
setContentView(drawView);
drawView.requestFocus();
}
}
DragView类::
public class DragView extends View implements OnTouchListener {
Paint paint = new Paint();
public DragView(Context context) {
super(context);
setFocusable(true);
setFocusableInTouchMode(true);
this.setOnTouchListener(this);
paint.setColor(Color.GREEN);
paint.setStyle(Paint.Style.FILL);
//paint.setStyle(Style.STROKE);
paint.setAntiAlias(true);
}
@Override
public void onDraw(final Canvas mCanvas) {
canvas.drawCircle(p.x, p.y, 5, paint);
canvas.drawLine(60, 60, 120,60, paint);
canvas.drawLine(60, 60, 60, 120, paint);
canvas.drawLine(60, 120, 120, 120, paint);
canvas.drawLine(120, 120, 120, 180, paint);
canvas.drawLine(120, 180, 60, 180, paint);
}
}
谢谢.
解决方法:
另一种方式,更通用:
public class LinesActivity extends Activity {
DemoView demoview;
int mCount = 0;
int mListSize = 0;
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
Paint paint = new Paint();
paint.setColor(Color.RED);
List<Coords> coordList = new ArrayList<Coords>();
// Load up the coordinates
coordList.add(new Coords(60, 60, 120, 60));
coordList.add(new Coords(60, 60, 60, 120));
coordList.add(new Coords(60, 120, 120, 120));
coordList.add(new Coords(120, 120, 120, 180));
coordList.add(new Coords(120, 180, 60, 180));
mListSize = coordList.size();
demoview = new DemoView(this, paint, coordList);
setContentView(demoview);
Timer timer = new Timer();
timer.schedule(new TimerTask() {
public void run() {
mCount++;
demoview.postInvalidate();
Log.d("LINES", "Timer triggered");
if (mCount >= mListSize) {
Log.d("LINES", "All done, cancelling timer");
cancel();
}
}
}, 5000, 5000);
}
private class Coords {
// little class to hold the coordinates
float mSx; float mSy; float mEx; float mEy;
public Coords(float sx, float sy, float ex, float ey) {
mSx = sx; mSy = sy; // start/end x/y
mEx = ex; mEy = ey;
}
}
private class DemoView extends View {
Paint mPaint;
List<Coords> mcList;
public DemoView(Context context, Paint paint, List<Coords> cList) {
super(context);
mPaint = paint;
mcList = cList;
}
@Override
protected void onDraw(Canvas canvas) {
super.onDraw(canvas);
int count = 0;
Log.d("LINES", "mcount" + mCount);
for (Coords c : mcList) { // draw all the lines
if (count >= mCount)
break; // up to the number in mCount
canvas.drawLine(c.mSx, c.mSy, c.mEx, c.mEy, mPaint);
count++;
}
}
}
}
标签:android,lines,paint 来源: https://codeday.me/bug/20190716/1482369.html
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