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android - 不使用位图的 Canvas 在 Android 中占用更多内存

转载 作者:行者123 更新时间:2023-11-30 01:47:48 26 4
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我有一个 View ,其中我使用 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糟糕的编码习惯,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,我有点不敢尝试)。所以在树中发生的步骤如下:

  1. 树是在没有使用任何文本的情况下绘制的。
  2. 随着用户被添加到树中,叶子的颜色会发生变化,文本也会被添加到树中。
  3. 此外,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(内存不足)。

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,我至少需要 3-4 秒来加载屏幕,如果用户较多,则加载时间超过 5 秒,有时,由于内存消耗较多,它会显示“App not responding”

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关闭我的应用程序。

所以我完全卡在这一点上无法继续进行,我已经投入了大量时间来构建这棵树,所以我希望应该有清除内存并重新构建 Canvas 的方法。

到目前为止我学到了什么:Android 不允许重新绘制页面的一部分,因此在加载页面时必须重新生成整个 Canvas 。

附言:如果有一种方法可以使用现有代码来克服内存问题,那么它会受到高度赞赏,因为浪费的时间太多了,如果没有其他方法只能完全破坏它并从头开始,那么我希望这种方法会给我我想要的。

树: enter image description here

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);

}
}


}

}



}

最佳答案

我看到了你的代码。因此,您正在使用 View 绘制所有实心圆。 onDraw 方法重载了计算和对象实例化。我建议您尽可能多地从 onDraw 方法中删除。如果计算可以在 View 的构建过程中进行,则在构造函数中进行,而不是在 onDraw 中进行。您需要使 onDraw 尽可能轻。

现在这是一个好的设计吗?在您的案例中使用 View 并不是一个好主意,因为单个更改会重绘整个 View 。相反,我建议您创建一个自定义 ViewGroup,并将所有这些 filled circles 作为其子级。这样,当单个圆圈的颜色或文本发生变化时,您无需重新绘制整个屏幕。

关于android - 不使用位图的 Canvas 在 Android 中占用更多内存,我们在Stack Overflow上找到一个类似的问题: https://stackoverflow.com/questions/33461000/

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