我正在寻找一个可以帮助我制作我的cricular图像视图的库,就像在Facebook Messenger中一样(带有z blue Messenger图标或灰色的Facebook图标)。他们是怎么想出来的?可以用Glide完成吗?如果没有,那么呢?
答案 0 :(得分:2)
不建议使用NSString *myString = @"Some words to form a string";
NSArray *wordsInSentence = [myString componentsSeparatedByString:@" "];
NSMutableArray *expectedResultArray = [[NSMutableArray alloc] init];
for (NSString *word in wordsInSentence) {
NSString *finalExpectedString = word;
if (word.length > 2) {
NSString *firstLetterInWord = [word substringToIndex:1];
NSString *lastLetterInWord = [word substringFromIndex:[word length] - 1];
finalExpectedString = [NSString stringWithFormat:@"%@%d%@", firstLetterInWord, (int)word.length - 2, lastLetterInWord];
}
[expectedResultArray addObject:finalExpectedString];
}
NSString *printString = [expectedResultArray componentsJoinedByString:@" "];
NSLog(@"Result : %@", printString);
/ @Override
public void onDestroy() {
super.onDestroy();
if (cursor != null) {
cursor.close();
}
}
/ CircleImageView
,we have many people reporting issues主要是因为他们破坏了Drawable中与最基本功能不兼容的Bitmap Glide:CircularImageView
,GIF动画也可能与他们分手。
正确的Glide方式是使用转换,你可以在这里找到一个足够好的: https://stackoverflow.com/a/25806229/253468
Glide 4.0将内置CircleCrop转换。
叠加图标也可以添加转换:
RoundedImageView
或只是有两个.crossFade()
s:
// .transform(new CircleTransform(context)), new StatusTransform(context, user.getStatus()))
public static class StatusTransform extends BitmapTransformation {
private final Status status;
public StatusTransform(Context context, Status status) {
super(context);
this.status = status;
}
@Override protected Bitmap transform(BitmapPool pool, Bitmap toTransform, int outWidth, int outHeight) {
int w = toTransform.getWidth(), h = toTransform.getHeight();
Bitmap result = pool.get(w, h, Bitmap.Config.ARGB_8888);
if (result == null) {
result = Bitmap.createBitmap(w, h, Bitmap.Config.ARGB_8888);
}
Canvas canvas = new Canvas(result);
canvas.drawBitmap(toTransform);
switch(status) {
case Online:
canvas.draw*(online graphics);
break;
case Offline:
canvas.draw*(offline graphics);
break;
}
return result;
}
@Override public String getId() {
return getClass().getName() + status;
}
}
两者都有优点和反差:转换结果可以缓存,所以如果你有3种状态,Glide会将每个用户的个人资料图像存储3次覆盖一个小图标,所以它可能只会应用一次然后它只是一个问题解码缓存的PNG(不是JPEG,因为圆圈强制透明)。使用两个ImageView,您必须有两个Glide加载线(或Glide和一个setImageResource),绘制和布局可能会慢一点。因此,您可以使用这两种方法将处理器时间交换到磁盘空间。使用ImageView方法,您还可以设置状态更改之间的转换动画,并始终显示状态,即使配置文件图像因网络不良而加载速度很慢。
如果转换ImageView
方法的代码发生变化,则需要使缓存无效,这可以通过以下方式实现:
<FrameLayout
xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="@dimen/user_profile_size"
android:layout_height="@dimen/user_profile_size"
>
<ImageView
android:id="@id/user_profile"
android:layout_width="@dimen/user_profile_size"
android:layout_height="@dimen/user_profile_size"
/>
<ImageView
android:id="@id/user_status"
android:layout_width="@dimen/user_status_size"
android:layout_height="@dimen/user_status_size"
android:layout_gravity="bottom|end"
/>
</FrameLayout>
或者,这种失效可以以某种方式构建到transform
方法中。
答案 1 :(得分:0)
1.我建议您查看图像管理库(Facebook) Fresco,与其他图像加载库相比,它非常棒且成熟。
2.Fresco拥有std::copy_if
作为自定义图片视图,支持SimpleDraweeView
link并支持动画(.gif,.webp)以及普通图像(.jpg,.png)
3.Fresco使用3层架构处理所有图像缓存(Rounded Corners and Circles
,BITMAP_MEMORY_CACHE
和ENCODED_MEMORY_CACHE
)。它还减少了OOM(Out Of Memory)问题。当视图中的图像离开屏幕时,它会自动回收位图,从而释放内存。
答案 2 :(得分:-1)
如果你的目标只有有一个CircleImage给出了一个镜头:
import android.content.Context;
import android.graphics.Bitmap;
import android.graphics.Canvas;
import android.graphics.Color;
import android.graphics.Paint;
import android.graphics.PorterDuff;
import android.graphics.PorterDuffXfermode;
import android.graphics.Rect;
import android.graphics.drawable.BitmapDrawable;
import android.graphics.drawable.Drawable;
import android.support.annotation.Nullable;
import android.util.AttributeSet;
import android.widget.ImageView;
public class RoundedImageView extends ImageView
{
public RoundedImageView(Context context)
{
super(context);
}
public RoundedImageView(Context context, @Nullable AttributeSet attrs)
{
super(context, attrs);
}
public RoundedImageView(Context context, @Nullable AttributeSet attrs, int defStyle)
{
super(context, attrs, defStyle);
}
public RoundedImageView(Context context, @Nullable AttributeSet attrs, int defStyleAttr, int defStyleRes)
{
super(context, attrs, defStyleAttr, defStyleRes);
}
public static Bitmap getCroppedBitmap(Bitmap bmp, int radius)
{
Bitmap sbmp;
if (bmp.getWidth() != radius || bmp.getHeight() != radius)
{
float smallest = Math.min(bmp.getWidth(), bmp.getHeight());
float factor = smallest / radius;
sbmp = Bitmap.createScaledBitmap(bmp, (int) (bmp.getWidth() / factor), (int) (bmp.getHeight() / factor), false);
}
else
{
sbmp = bmp;
}
Bitmap output = Bitmap.createBitmap(radius, radius,
Bitmap.Config.ARGB_8888);
Canvas canvas = new Canvas(output);
final int color = 0xffa19774;
final Paint paint = new Paint();
final Rect rect = new Rect(0, 0, radius, radius);
paint.setAntiAlias(true);
paint.setFilterBitmap(true);
paint.setDither(true);
canvas.drawARGB(0, 0, 0, 0);
paint.setColor(Color.parseColor("#BAB399"));
canvas.drawCircle(radius / 2 + 0.7f,
radius / 2 + 0.7f, radius / 2 + 0.1f, paint);
paint.setXfermode(new PorterDuffXfermode(PorterDuff.Mode.SRC_IN));
canvas.drawBitmap(sbmp, rect, rect, paint);
return output;
}
@Override
protected void onDraw(Canvas canvas)
{
Drawable drawable = getDrawable();
if (drawable == null)
{
return;
}
if (getWidth() == 0 || getHeight() == 0)
{
return;
}
Bitmap b = ((BitmapDrawable) drawable).getBitmap();
Bitmap bitmap = b.copy(Bitmap.Config.ARGB_8888, true);
int w = getWidth(), h = getHeight();
Bitmap roundBitmap = getCroppedBitmap(bitmap, w);
canvas.drawBitmap(roundBitmap, 0, 0, null);
}
}
在你的布局中你可以使用它:
<mypkg.example.RoundedImageView
android:id="@+id/roundimg"
android:layout_width="54dp"
android:layout_height="54dp"
android:layout_gravity="center"/>
并以编程方式设置一封信..
Rect textBounds = new Rect();
String text = "N"
Bitmap bitmap = Bitmap.createBitmap(imageView.getLayoutParams().width, imageView.getLayoutParams().height, Bitmap.Config.ARGB_8888);
Canvas canvas = new Canvas(bitmap);
canvas.drawColor(Color.DKGRAY);
TextPaint p = new TextPaint();
p.setColor(Color.WHITE);
p.setTextSize(imageView.getLayoutParams().height / 2);
p.setAntiAlias(true);
p.setTextAlign(Paint.Align.LEFT);
p.getTextBounds(text, 0, text.length(), textBounds);
int cx = imageView.getLayoutParams().width / 2;
int cy = imageView.getLayoutParams().height / 2;
canvas.drawText(text, cx - textBounds.exactCenterX(), cy - textBounds.exactCenterY(), p);
imageView.setImageBitmap(bitmap);
或图片..
// image grabbed from an input stream
Bitmap photo = BitmapFactory.decodeStream(inputStream);
imageView.setImageBitmap(photo);
这有用吗?更多信息和积分How to create a circular ImageView in Android?