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我想創建兩個紡車輪，如滑輪，所以每次連接的繩索移動時，兩個皮帶輪都會旋轉。我曾嘗試兩種方法：android紡紗圖像
1）的onDraw（）View類的方法，它調用以下內使用Matrix.postRotate：
private void drawSpinningWheel(Canvas canvas)
{
try
{
canvas.save();
Bitmap bitmapOrg = null;
int iDrawable = R.drawable.spinning_button;
bitmapOrg = BitmapFactory.decodeResource(getResources(), iDrawable);
if(bitmapOrg != null)
{
int width = bitmapOrg.getWidth();
int height = bitmapOrg.getHeight();
int newWidth = 24;
int newHeight = 24;
// calculate the scale - in this case = 0.4f
float scaleWidth = ((float) newWidth)/width;
float scaleHeight = ((float) newHeight)/height;
// createa matrix for the manipulation
Matrix matrix = new Matrix();
// resize the bit map
matrix.postScale(scaleWidth, scaleHeight);
matrix.postRotate((float) mDegrees++);
Bitmap resizedBitmap = Bitmap.createBitmap(bitmapOrg, 0, 0,
width, height, matrix, true);
canvas.drawBitmap(resizedBitmap, matrix, null);
}
canvas.restore();
}
catch(Exception e)
{
Log.e(TAG + "drawSpinningWheel", e.getMessage());
}
}
但似乎圖像不僅旋轉，但旋轉圍繞另一軸線
2）使用SurfaceView和一個單獨的線程，在run（）調用此：
private void doDraw(Canvas canvas) {
// Draw the background image. Operations on the Canvas accumulate
// so this is like clearing the screen.
canvas.drawBitmap(mBackgroundImage, 0, 0, null);
int yTop = mCanvasHeight - ((int) mY + mSpinningWheelImageHeight/2);
int xLeft = (int) mX - mSpinningWheelImageWidth/2;
...
// Draw the ship with its current rotation
canvas.save();
canvas.rotate((float) mHeading++, (float) mX, mCanvasHeight
- (float) mY);
mSpinningWheelImage.setBounds(xLeft, yTop, xLeft + mSpinningWheelImageWidth, yTop
+ mSpinningWheelImageHeight);
mSpinningWheelImage.draw(canvas);
canvas.restore();
}
我讓紡紗工作，但我不能添加另一個紡車。我甚至試圖爲第二個紡車創建另一個線程，只有一個出現。有人能指引我走向正確的方向嗎？謝謝。
3）好了，現在我也嘗試RotateAnimation：
公共類GraphicsView擴展查看 { 私有靜態最後絃樂QUOTE = 「沒有人使用Java了它的這個大權重股鎖鏈。」
private Animation anim;
private Animation anim2;
private Bitmap jobs;
private Bitmap wheel;
private int jobsXOffset;
private int jobsYOffset;
private int wheelXOffset;
private int wheelYOffset;
public GraphicsView(Context context)
{
super(context);
jobs = BitmapFactory
.decodeResource(getResources(), R.drawable.spinning_button);
jobsXOffset = jobs.getWidth()/2;
jobsYOffset = jobs.getHeight()/2;
wheel = BitmapFactory
.decodeResource(getResources(), R.drawable.wheel);
wheelXOffset = jobs.getWidth()/2;
wheelYOffset = jobs.getHeight()/2;
}
private void createAnim(Canvas canvas)
{
anim = new RotateAnimation(0, 360, canvas.getWidth()/2, canvas
.getHeight()/2);
anim.setRepeatMode(Animation.INFINITE);
anim.setRepeatCount(Animation.INFINITE);
anim.setDuration(10000L);
anim.setInterpolator(new AccelerateDecelerateInterpolator());
startAnimation(anim);
}
private void createAnim2(Canvas canvas)
{
anim2 = new RotateAnimation(0, 360, canvas.getWidth()/2+30, canvas
.getHeight()/2);
anim2.setRepeatMode(Animation.INFINITE);
anim2.setRepeatCount(Animation.INFINITE);
anim2.setDuration(10000L);
anim2.setInterpolator(new AccelerateDecelerateInterpolator());
startAnimation(anim);
}
@Override
protected void onDraw(Canvas canvas) {
super.onDraw(canvas);
// creates the animation the first time
if (anim == null) {
createAnim(canvas);
}
int centerX = canvas.getWidth()/2;
int centerY = canvas.getHeight()/2;
canvas.drawBitmap(jobs, centerX - jobsXOffset,
centerY - jobsYOffset, null);
canvas.drawBitmap(wheel, centerX - wheelXOffset + 30,
centerY - wheelYOffset, null);
}
}
但結果卻是相似Canvas.Rotate，我能得到第一圖像旋轉正常，但第二圖象僅僅圍繞第一圖像周圍，但我注意到第二個圖像實際上也在旋轉。看起來像我將需要一個單獨的視圖爲第二個圖像，我希望避免這一點，因爲我不知道如何使輪子旋轉，但附加的繩子不旋轉。
我做了，它只能繞左上角旋轉。我無法找到設置讓它圍繞我的drawable的中心旋轉（旋轉）。你能提供一些細節嗎？ – mobibob 2010-06-29 02:09:36