【发布时间】：2023-03-10 11:45:01
【问题描述】：
我有一个视图，我使用 Canvas 和 Path 绘制了一个树形结构，它看起来像下面给出的那个。我画树的方式是一个不好的编码习惯，我很清楚这一点，但由于缺乏更好的方法，我不得不遵循这种风格。 （我没有在 OpenGL 中尝试过，我有点害怕尝试）。所以在树中发生的步骤如下：
- 树的绘制不使用任何文本。
- 当用户被添加到树中时，叶子的颜色会发生变化并添加文本。
- 除此之外，这些叶子应该有图像而不是纯文本，这可以通过使用
drawBitmap来实现，这显然会导致我将来出现 OOM（Out Of Memory）。
所以这些是目前发生的步骤，当彩色叶子数量较少（意味着用户较少）时，这至少需要 3-4 秒才能加载屏幕，如果用户较多，则加载时间超过 5 秒，有时会显示“应用程序无响应”，因为内存消耗过多。
我不知道如何继续，因为向用户显示此屏幕会占用所有内存并强制我的应用关闭。
所以我完全被困在这一点上，无法继续前进，我已经投入了大量时间来构建这棵树，所以我希望应该有办法清除内存并重新构建画布。
到目前为止我学到了什么： Android 不允许再次绘制页面的一部分，因此在加载页面时必须重新生成整个画布。
附注： 如果有一种方法可以使用现有代码来克服内存问题，那么它的高度赞赏会导致浪费的时间太多，如果除了完全破坏它并从头开始之外别无他法，那么我希望这种方式会给我我想要的。
代码：
@Override
public void onDraw(Canvas canv) {
//gggggggggggg
for (CircleArea circle : mCircles) {
if(dbHelper.getRelationTypes().size() > 0)
{
//System.out.println("dbHelper.getRelationTypes().size() > 0");
//System.out.println("Inside the Spouse or Father and Mother");
CircleCanvas.spouse_added = true;
//Couples
if(circle.radius==XHDPI_COUPLE_RADIUS_LIMIT)
{
// System.out.println("if(circle.radius==70)");
if(circle.getCenterX() == my_x && circle.getCenterY() == my_y)
{
dbHelper.insertXYOfRelation("Self", circle.getCenterX(), circle.getCenterY());
if(DashboardActivity.profile_image_from_local!=null)
{
Bitmap resized = Bitmap.createScaledBitmap(DashboardActivity.profile_image_from_local, 200, 200, true);
Bitmap result = null;
try {
result = Bitmap.createBitmap(200,200, Bitmap.Config.ARGB_8888);
Canvas canvas = new Canvas(result);
int color = 0xff424242;
Paint paint = new Paint();
Rect rect = new Rect(0, 0, 200, 200);
//RectF rectF = new RectF(rect);
paint.setAntiAlias(true);
canvas.drawARGB(0, 0, 0, 0);
paint.setColor(color);
canvas.drawCircle(XHDPI_COUPLE_RADIUS_LIMIT, XHDPI_COUPLE_RADIUS_LIMIT, XHDPI_COUPLE_RADIUS_LIMIT, paint);
//canvas.drawOval(rectF, paint);
paint.setXfermode(new PorterDuffXfermode(PorterDuff.Mode.SRC_IN));
canvas.drawBitmap(resized, rect, rect, paint);
} catch (NullPointerException e) {
} catch (OutOfMemoryError o) {
}
System.out.println("Inside Me");
canv.drawBitmap(result, circle.getCenterX() - result.getWidth() / 3, circle.getCenterY() - result.getHeight() / 3, null);
}
else if(DashboardActivity.profile_image!=null)
{
Bitmap resized = Bitmap.createScaledBitmap(DashboardActivity.profile_image, 200, 200, true);
Bitmap result = null;
try {
result = Bitmap.createBitmap(200,200, Bitmap.Config.ARGB_8888);
Canvas canvas = new Canvas(result);
int color = 0xff424242;
Paint paint = new Paint();
Rect rect = new Rect(0, 0, 200, 200);
//RectF rectF = new RectF(rect);
paint.setAntiAlias(true);
canvas.drawARGB(0, 0, 0, 0);
paint.setColor(color);
canvas.drawCircle(XHDPI_COUPLE_RADIUS_LIMIT, XHDPI_COUPLE_RADIUS_LIMIT, XHDPI_COUPLE_RADIUS_LIMIT, paint);
//canvas.drawOval(rectF, paint);
paint.setXfermode(new PorterDuffXfermode(PorterDuff.Mode.SRC_IN));
canvas.drawBitmap(resized, rect, rect, paint);
} catch (NullPointerException e) {
} catch (OutOfMemoryError o) {
}
System.out.println("Inside Me");
canv.drawBitmap(result, circle.getCenterX() - result.getWidth() / 3, circle.getCenterY() - result.getHeight() / 3, null);
}
else
{
canv.drawCircle(circle.getCenterX(), circle.getCenterY(), XHDPI_COUPLE_RADIUS_LIMIT, mMarriedPaint);
canv.drawText(dbHelper.getNameOfRelation("Self"), circle.getCenterX() - 34, circle.getCenterY(), mXHDPICoupleTextPaint);
Log.e("Ondraw Self", "Ondraw Self");
}
}
else
{
if(dbHelper.getWhatRelationTypes("Spouse"))
{
// System.out.println("Inside Spouse");
dbHelper.insertXYOfRelation("Spouse",circle.getCenterX(),circle.getCenterY());
Log.e("Spouseeeeeeee ", "" + circle.getCenterX() + " " + circle.getCenterY() + dbHelper.insertXYOfRelation("Spouse", circle.getCenterX(), circle.getCenterY()));
canv.drawCircle(circle.getCenterX(), circle.getCenterY(), XHDPI_COUPLE_RADIUS_LIMIT, mMarriedPaint);
canv.drawText(dbHelper.getNameOfRelation("Spouse"), circle.getCenterX() - 34, circle.getCenterY(), mXHDPICoupleTextPaint);
}
else
{
canv.drawCircle(circle.getCenterX(), circle.getCenterY(), XHDPI_COUPLE_RADIUS_LIMIT, mFilledPaint);
Log.e("Ondraw Spouse", "Ondraw Spouse");
}
}
}
//Parents
if(circle.radius==XHDPI_PARENTS_RADIUS_LIMIT)
{
// System.out.println("if(circle.radius==55)");
if(circle.getCenterX() == father_x && circle.getCenterY() == father_y)
{
if(dbHelper.getWhatRelationTypes("Father"))
{
dbHelper.insertXYOfRelation("Father", circle.getCenterX(), circle.getCenterY());
// System.out.println("Inside Father" + "X : " + dbHelper.getXOfRelation("Father") + " Y: " +dbHelper.getYOfRelation("Father"));
canv.drawCircle(dbHelper.getXOfRelation("Father"),dbHelper.getYOfRelation("Father"), XHDPI_PARENTS_RADIUS_LIMIT, mMarriedPaint);
canv.drawText(dbHelper.getNameOfRelation("Father"), circle.getCenterX() - 22, circle.getCenterY(), mXHDPIParentsTextPaint);
}
else
{
canv.drawCircle(circle.getCenterX(), circle.getCenterY(), XHDPI_PARENTS_RADIUS_LIMIT, mFilledPaint);
Log.e("Ondraw Father", "Ondraw Father");
}
}else if(circle.getCenterX() == mother_x && circle.getCenterY() == mother_y)
{
if(dbHelper.getWhatRelationTypes("Mother"))
{
// System.out.println("Inside Mother");
dbHelper.insertXYOfRelation("Mother", circle.getCenterX(), circle.getCenterY());
canv.drawCircle(dbHelper.getXOfRelation("Mother"), dbHelper.getYOfRelation("Mother"), XHDPI_PARENTS_RADIUS_LIMIT, mMarriedPaint);
canv.drawText(dbHelper.getNameOfRelation("Mother"), circle.getCenterX() - 22, circle.getCenterY(), mXHDPIParentsTextPaint);
}
else
{
canv.drawCircle(circle.getCenterX(), circle.getCenterY(), XHDPI_PARENTS_RADIUS_LIMIT, mFilledPaint);
Log.e("Ondraw Mother", "Ondraw Mother");
}
}else if(circle.getCenterX() == spouse_father_x && circle.getCenterY() == spouse_father_y)
{
if(dbHelper.getWhatRelationTypes("Spouses Father"))
{
// System.out.println("Inside Spouses Father");
dbHelper.insertXYOfRelation("Spouses Father", circle.getCenterX(), circle.getCenterY());
canv.drawCircle(dbHelper.getXOfRelation("Spouses Father"), dbHelper.getYOfRelation("Spouses Father"), XHDPI_PARENTS_RADIUS_LIMIT, mMarriedPaint);
canv.drawText(dbHelper.getNameOfRelation("Spouses Father"), circle.getCenterX() - 22, circle.getCenterY(), mXHDPIParentsTextPaint);
}
else
{
canv.drawCircle(circle.getCenterX(), circle.getCenterY(), XHDPI_PARENTS_RADIUS_LIMIT, mFilledPaint);
Log.e("Ondraw Spouses Father", "Ondraw Spouses Father");
}
}else if(circle.getCenterX() == spouse_mother_x && circle.getCenterY() == spouse_mother_y)
{
if(dbHelper.getWhatRelationTypes("Spouses Mother"))
{
dbHelper.insertXYOfRelation("Spouses Mother", circle.getCenterX(), circle.getCenterY());
canv.drawCircle(dbHelper.getXOfRelation("Spouses Mother"), dbHelper.getYOfRelation("Spouses Mother"), XHDPI_PARENTS_RADIUS_LIMIT, mMarriedPaint);
canv.drawText(dbHelper.getNameOfRelation("Spouses Mother"), circle.getCenterX() - 22, circle.getCenterY(), mXHDPIParentsTextPaint);
}
else
{
canv.drawCircle(circle.getCenterX(), circle.getCenterY(), XHDPI_PARENTS_RADIUS_LIMIT, mFilledPaint);
Log.e("Ondraw Spouses Mother", "Ondraw Spouses Mother");
}
}
}
//Childrens
if (circle.radius == XHDPI_CHILD_RADIUS_LIMIT) {
if (dbHelper.FetchChildFriendCountFromUserTable("Child").size() > 0) {
child_x.clear();
child_y.clear();
child_x.add(c1_x);
child_x.add(c2_x);
child_x.add(c3_x);
child_x.add(c4_x);
child_x.add(c5_x);
child_y.add(c1_y);
child_y.add(c2_y);
child_y.add(c3_y);
child_y.add(c4_y);
child_y.add(c5_y);
for (int r = 0; r < dbHelper.FetchChildFriendCountFromUserTable("Child").size(); r++) {
if(dbHelper.FetchChildFriendCountFromUserTable("Child").get(r).equalsIgnoreCase("Child1"))
{
new_c_x = c1_x;
new_c_y = c1_y;
dbHelper.insertChildOriginalXY("Child1", new_c_x, new_c_y);
dbHelper.insertXYOfRelation("Child1", new_c_x, new_c_y);
child_x.remove(new Integer(c1_x));
child_y.remove(new Integer(c1_y));
canv.drawCircle(dbHelper.getXOfRelation("Child1"), dbHelper.getYOfRelation("Child1"), XHDPI_DRAWN_CHILD_RADIUS_LIMIT, mChildFilledPaint);
canv.drawText(dbHelper.getNameOfRelation("Child1"), dbHelper.getXOfRelation("Child1") - 14, dbHelper.getYOfRelation("Child1"), mXHDPIChildTextPaint);
}else if(dbHelper.FetchChildFriendCountFromUserTable("Child").get(r).equalsIgnoreCase("Child2"))
{
new_c_x = c2_x;
new_c_y = c2_y;
child_x.remove(new Integer(c2_x));
child_y.remove(new Integer(c2_y));
dbHelper.insertChildOriginalXY("Child2", new_c_x, new_c_y);
dbHelper.insertXYOfRelation("Child2", new_c_x, new_c_y);
canv.drawCircle(dbHelper.getXOfRelation("Child2"), dbHelper.getYOfRelation("Child2"), XHDPI_DRAWN_CHILD_RADIUS_LIMIT, mChildFilledPaint);
canv.drawText(dbHelper.getNameOfRelation("Child2"), dbHelper.getXOfRelation("Child2") - 14, dbHelper.getYOfRelation("Child2"), mXHDPIChildTextPaint);
}else if(dbHelper.FetchChildFriendCountFromUserTable("Child").get(r).equalsIgnoreCase("Child3"))
{
new_c_x = c3_x;
new_c_y = c3_y;
child_x.remove(new Integer(c3_x));
child_y.remove(new Integer(c3_y));
dbHelper.insertChildOriginalXY("Child3", new_c_x, new_c_y);
dbHelper.insertXYOfRelation("Child3", new_c_x, new_c_y);
canv.drawCircle(dbHelper.getXOfRelation("Child3"), dbHelper.getYOfRelation("Child3"), XHDPI_DRAWN_CHILD_RADIUS_LIMIT, mChildFilledPaint);
canv.drawText(dbHelper.getNameOfRelation("Child3"), dbHelper.getXOfRelation("Child3") - 14, dbHelper.getYOfRelation("Child3"), mXHDPIChildTextPaint);
}else if(dbHelper.FetchChildFriendCountFromUserTable("Child").get(r).equalsIgnoreCase("Child4"))
{
new_c_x = c4_x;
new_c_y = c4_y;
child_x.remove(new Integer(c4_x));
child_y.remove(new Integer(c4_y));
dbHelper.insertChildOriginalXY("Child4", new_c_x, new_c_y);
dbHelper.insertXYOfRelation("Child4", new_c_x, new_c_y);
canv.drawCircle(dbHelper.getXOfRelation("Child4"), dbHelper.getYOfRelation("Child4"), XHDPI_DRAWN_CHILD_RADIUS_LIMIT, mChildFilledPaint);
canv.drawText(dbHelper.getNameOfRelation("Child4"), dbHelper.getXOfRelation("Child4") - 14, dbHelper.getYOfRelation("Child4"), mXHDPIChildTextPaint);
}else if(dbHelper.FetchChildFriendCountFromUserTable("Child").get(r).equalsIgnoreCase("Child5"))
{
new_c_x = c5_x;
new_c_y = c5_y;
child_x.remove(new Integer(c5_x));
child_y.remove(new Integer(c5_y));
dbHelper.insertChildOriginalXY("Child5", new_c_x, new_c_y);
dbHelper.insertXYOfRelation("Child5", new_c_x, new_c_y);
canv.drawCircle(dbHelper.getXOfRelation("Child5"), dbHelper.getYOfRelation("Child5"), XHDPI_DRAWN_CHILD_RADIUS_LIMIT, mChildFilledPaint);
canv.drawText(dbHelper.getNameOfRelation("Child5"), dbHelper.getXOfRelation("Child5") - 14, dbHelper.getYOfRelation("Child5"), mXHDPIChildTextPaint);
}
}
if(child_x.size()!=0)
{
for(int i=0;i<child_x.size();i++)
{
canv.drawCircle(child_x.get(i),child_y.get(i),XHDPI_CHILD_RADIUS_LIMIT,mCirclePaint);
}
}
} else {
canv.drawCircle(circle.getCenterX(), circle.getCenterY(), XHDPI_CHILD_RADIUS_LIMIT, mCirclePaint);
}
}
//Friends
if (circle.radius==FRIENDS_RADIUS_LIMIT)
{
//tujomila
if(dbHelper.FetchChildFriendCountFromUserTable("Friend").size() > 0)
{
// Log.e("","The friend list size is " + dbHelper.getFriendRelationTypes().size());
// Log.e("","The size of circlepointers is " + circle_pointers);
for (int q=1;q<=dbHelper.FetchChildFriendCountFromUserTable("Friend").size();q++)
{
//Log.e("","The X of friend" + q + " is " + dbHelper.getFriendCorrespondingXValue(q,"Married")) ;
//Log.e("","The Y of friend" + q + " is " + dbHelper.getFriendCorrespondingYValue(q,"Married")) ;
canv.drawCircle(dbHelper.getFriendCorrespondingXValue(q,"Married"),dbHelper.getFriendCorrespondingYValue(q,"Married"),FRIENDS_RADIUS_LIMIT,mChildFilledPaint);
canv.drawText(dbHelper.getNameOfRelation("Friend" + q), dbHelper.getXOfRelation("Friend" + q) - 17, dbHelper.getYOfRelation("Friend"+q), mXHDPIFriendTextPaint);
dbHelper.insertXYOfRelation("Friend" + q, dbHelper.getFriendCorrespondingXValue(q,"Married"), dbHelper.getFriendCorrespondingYValue(q,"Married"));
friend_x.add(dbHelper.getFriendCorrespondingXValue(q,"Married"));
friend_y.add(dbHelper.getFriendCorrespondingYValue(q,"Married"));
}
for(int w=dbHelper.FetchChildFriendCountFromUserTable("Friend").size()+ 1;w<=34;w++) {
// Log.e("Pointer is " + w,"The X value at w is " + dbHelper.getFriendCorrespondingXValue(w,"Married") + " The Y value at w is " + dbHelper.getFriendCorrespondingYValue(w,"Married"));
canv.drawCircle(dbHelper.getFriendCorrespondingXValue(w,"Married"),dbHelper.getFriendCorrespondingYValue(w,"Married"), FRIENDS_RADIUS_LIMIT, mCirclePaint);
}
}
else
{
canv.drawCircle(circle.getCenterX(), circle.getCenterY(), FRIENDS_RADIUS_LIMIT, mCirclePaint);
}
}
}
else
{
//System.out.println("Else of CircleCanvas.member_type!=null");
if (circle.radius == FRIENDS_RADIUS_LIMIT) {
canv.drawCircle(circle.getCenterX(), circle.getCenterY(), FRIENDS_RADIUS_LIMIT, mCirclePaint);
}else if (circle.radius == XHDPI_CHILD_RADIUS_LIMIT) {
canv.drawCircle(circle.getCenterX(), circle.getCenterY(), XHDPI_CHILD_RADIUS_LIMIT, mCirclePaint);
} else if (circle.radius == XHDPI_PARENTS_RADIUS_LIMIT) {
canv.drawCircle(circle.getCenterX(), circle.getCenterY(), XHDPI_PARENTS_RADIUS_LIMIT, mFilledPaint);
} else {
canv.drawCircle(circle.getCenterX(), circle.getCenterY(), XHDPI_COUPLE_RADIUS_LIMIT, mMarriedPaint);
}
}
}
}
}
【问题讨论】：
标签： android bitmap android-canvas