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我是新來的機器人,並結束了(得)這裏問一個問題,列表項(視圖)爲了unexpextedly變化而(快)在ListView滾動
讓我們把它簡單,我只是想讓我自己般的TextView (MyView的擴展視圖),
這是我的代碼:
public class MyView extends View {
private Paint mPaint;
private String mText;
private Bitmap mBitmap1;
private Bitmap mBitmap2;
public MyView(Context context) {
super(context);
initView();
}
public MyView(Context context, AttributeSet attrs) {
super(context, attrs);
initView();
}
private final void initView() {
mPaint = new Paint();
}
public void setText(String text) {
mText = text;
}
@Override
protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) {
int measuredWidth = measureWidth(widthMeasureSpec);
if (mBitmap1 == null) initBitmap1(measuredWidth);
int measuredHeight = measureHeight(heightMeasureSpec);
setMeasuredDimension(measuredWidth, measuredHeight);
}
private void initBitmap1(int measuredWidth) {
mBitmap1 = Bitmap.createBitmap(measuredWidth, Fonts.getHeight(), Bitmap.Config.ARGB_4444);
Canvas canvas = new Canvas(mBitmap1);
canvas.drawText(mText, 0, 0, mPaint);
}
private void initBitmap2() {
mBitmap2 = Bitmap.createBitmap(30, Fonts.getHeight(), Bitmap.Config.ARGB_4444);
Canvas canvas = new Canvas(mBitmap2);
canvas.drawText(mText, 0, 0, mPaint);
}
private int measureWidth(int widthMeasureSpec) {
int measuredWidth = 0;
int specWidthMode = MeasureSpec.getMode(widthMeasureSpec);
int specWidthSize = MeasureSpec.getSize(widthMeasureSpec);
if (specWidthMode == MeasureSpec.EXACTLY) {
measuredWidth = specWidthSize;
} else {
measuredWidth = getWidth();
if (specWidthMode == MeasureSpec.AT_MOST) {
measuredWidth = Math.min(measuredWidth, specWidthSize);
}
}
return measuredWidth;
}
private int measureHeight(int heightMeasureSpec) {
int measuredHeight = 0;
int specHeightMode = MeasureSpec.getMode(heightMeasureSpec);
int specHeightSize = MeasureSpec.getSize(heightMeasureSpec);
if (specHeightMode == MeasureSpec.EXACTLY) {
measuredHeight = specHeightSize;
} else {
measuredHeight = 80;
if (specHeightMode == MeasureSpec.AT_MOST) {
measuredHeight = Math.min(measuredHeight, specHeightSize);
}
}
return measuredHeight;
}
@Override
protected void onDraw(Canvas canvas) {
super.onDraw(canvas);
canvas.drawBitmap(mBitmap1, getLeft(), 0, mPaint);
initBitmap2();
canvas.drawBitmap(mBitmap2, getLeft(), 30, mPaint);
}
}
在我的代碼,我填充MyView的的一些數字(LE我的問題是爲什麼mBitmap1的順序隨機變化,而我快速滾動 (上下)(如果我滾動緩慢,這個問題不會發生)..?????????????
mBitmap2會留在那些應該..
還好,問題在這個線程被sholved:http://groups.google.com/group/android-developers/browse_thread/thread/e508e2d20b1fcda9/0785597e31b51cd3#0785597e31b51cd3 – siriusdely 2010-09-08 03:19:41