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我有以下類:動畫效果的onDraw()段
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GuageAnimation類如下:
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()
}
}
所以基本上這個作物在一個時間的圓形圖像一塊基於弧方程。我想顯示一個動畫,如圈子的所有部分都被填充(所以顯示每個被修剪的路徑,以顯示正在構建的圓形)。所以我想做得像循環:
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();
}
但是,這並不工作,它只是繪製最終結果當i = 100,人有一個想法,我怎麼能做到這一點?