我有以下课程:
public class MainActivity extends Activity {
/** Called when the activity is first created. */
String value = "0";
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
getWindow().setFlags(WindowManager.LayoutParams.FLAG_FULLSCREEN,
WindowManager.LayoutParams.FLAG_FULLSCREEN);
setContentView(new GaugeAnimation(this));
}
}
我的 GuageAnimation 类如下:
public class GaugeAnimation extends View{
private Path p;
private Paint cPaint = new Paint();
private int width = 200;
private int angleStart = 135;
private int sweep = 90;
private int value=0;
Bitmap bottom = BitmapFactory.decodeResource(getResources(), R.drawable.dashboard_rpm_bottom);
Bitmap top= BitmapFactory.decodeResource(getResources(), R.drawable.dashboard_rpm_active);
public GaugeAnimation(Context context){
super (context);
//Arc Equations & etc....
}
@Override
public void onDraw(Canvas c){
Paint paint = new Paint();
paint.setFilterBitmap(false);
paint.setColor(Color.BLUE);
c.translate(55,320);
//Draw bottom image on canvas
c.save();
p.addArc(new RectF(0,0,width,width), angleStart, sweep);
p.lineTo(width/2, width/2);
c.clipPath(p);
//draw Image on top
c.restore();
invalidate()
}
}
所以基本上这会根据弧形方程一次裁剪一个圆形图像。我想显示一个动画,比如圆圈的所有部分都被填充(因此显示每个剪辑的路径来演示一个正在构建的圆圈)。所以我正在考虑做一个for循环,如:
for (int i=0; i<100; i++) {
sweep=i;
p.addArc(new RectF(0,0,width,width), angleStart, sweep);
p.lineTo(width/2, width/2);
c.clipPath(p);
invalidate();
}
但这不起作用,它只是在 i=100 时得出最终结果,有人知道我该怎么做吗?