android View onDraw被调用判断_android studio ondraw一直被调用

    static final int PFLAG_DIRTY                       = 0x00200000;
 
    /**
     * View flag indicating whether this view was invalidated by an opaque
     * invalidate request.
     *
     * @hide
     */
    static final int PFLAG_DIRTY_OPAQUE                = 0x00400000;
 
    /**
     * Mask for {@link #PFLAG_DIRTY} and {@link #PFLAG_DIRTY_OPAQUE}.
     *
     * @hide
     */
    static final int PFLAG_DIRTY_MASK                  = 0x00600000;

public void draw(Canvas canvas) {
        ............................................................
        final boolean dirtyOpaque = (privateFlags & PFLAG_DIRTY_MASK) == PFLAG_DIRTY_OPAQUE &&
                (mAttachInfo == null || !mAttachInfo.mIgnoreDirtyState);
        mPrivateFlags = (privateFlags & ~PFLAG_DIRTY_MASK) | PFLAG_DRAWN;