Android 总是从占位符中淡入毕加索
我仍然不知道这是一个bug报告还是一个特性请求,所以请容忍我 我正在使用,并且我注意到示例应用程序总是从Android 总是从占位符中淡入毕加索,android,fadein,picasso,Android,Fadein,Picasso,我仍然不知道这是一个bug报告还是一个特性请求,所以请容忍我 我正在使用,并且我注意到示例应用程序总是从之前的图像中淡入(有关我的意思的演示,请参阅)。但是,我希望它总是从给定的占位符中淡入 我对这种行为的猜测是,网格视图被循环使用,毕加索在淡入实际图像之前没有设置占位符 这是故意的吗?我怎样才能始终从占位符淡入 Picasso.with(this).load(image URL) .placeholder(place_holder_bitmap).error(place_holder_bitm
之前的图像中淡入(有关我的意思的演示,请参阅)。但是,我希望它总是从给定的占位符中淡入
我对这种行为的猜测是,网格视图被循环使用,毕加索在淡入实际图像之前没有设置占位符
这是故意的吗?我怎样才能始终从占位符淡入
Picasso.with(this).load(image URL)
.placeholder(place_holder_bitmap).error(place_holder_bitmap)
.resize(call resize method here to pass new pixels constraint, getPixels(30))
.transform(transformation).into(imageView);
在我的例子中,转换被应用于制作圆形图像视图,如果这部分代码在您的项目中不重要,请忽略它。毕加索支持某些特定情况下的淡入淡出动画。然而,这对我来说不起作用,因为我正在使用毕加索定制的靶子,它允许我设置背景可绘制
我复制了PicassocDrawable,它有一个很好的淡入淡出动画,并添加了公共构造函数
/* Copyright (C) 2013 Square, Inc.
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package com.example.app;
import android.content.Context;
import android.graphics.Bitmap;
import android.graphics.Canvas;
import android.graphics.ColorFilter;
import android.graphics.Paint;
import android.graphics.Rect;
import android.graphics.drawable.AnimationDrawable;
import android.graphics.drawable.BitmapDrawable;
import android.graphics.drawable.Drawable;
import android.os.Build;
import android.os.SystemClock;
import android.widget.ImageView;
/**
* Changelog :
* - Modified from Picasso 2.5.0 to allow public instantiation
*/
public class CustomPicassoDrawable extends BitmapDrawable{
// Only accessed from main thread.
private static final Paint DEBUG_PAINT = new Paint();
private static final float FADE_DURATION = 200f; //ms
/**
* Create or update the drawable on the target {@link android.widget.ImageView} to display the supplied bitmap
* image.
*/
static void setBitmap(ImageView target, Context context, Bitmap bitmap) {
Drawable placeholder = target.getDrawable();
if (placeholder instanceof AnimationDrawable) {
((AnimationDrawable) placeholder).stop();
}
CustomPicassoDrawable drawable =
new CustomPicassoDrawable(context, bitmap, placeholder);
target.setImageDrawable(drawable);
}
/**
* Create or update the drawable on the target {@link ImageView} to display the supplied
* placeholder image.
*/
static void setPlaceholder(ImageView target, Drawable placeholderDrawable) {
target.setImageDrawable(placeholderDrawable);
if (target.getDrawable() instanceof AnimationDrawable) {
((AnimationDrawable) target.getDrawable()).start();
}
}
private final float density;
Drawable placeholder;
long startTimeMillis;
boolean animating;
int alpha = 0xFF;
public CustomPicassoDrawable(Context context, Bitmap bitmap, Drawable placeholder) {
super(context.getResources(), bitmap);
this.density = context.getResources().getDisplayMetrics().density;
this.placeholder = placeholder;
animating = true;
startTimeMillis = SystemClock.uptimeMillis();
}
@Override public void draw(Canvas canvas) {
if (!animating) {
super.draw(canvas);
} else {
float normalized = (SystemClock.uptimeMillis() - startTimeMillis) / FADE_DURATION;
if (normalized >= 1f) {
animating = false;
placeholder = null;
super.draw(canvas);
} else {
if (placeholder != null) {
placeholder.draw(canvas);
}
int partialAlpha = (int) (alpha * normalized);
super.setAlpha(partialAlpha);
super.draw(canvas);
super.setAlpha(alpha);
if (Build.VERSION.SDK_INT <= Build.VERSION_CODES.GINGERBREAD_MR1) {
invalidateSelf();
}
}
}
}
@Override public void setAlpha(int alpha) {
this.alpha = alpha;
if (placeholder != null) {
placeholder.setAlpha(alpha);
}
super.setAlpha(alpha);
}
@Override public void setColorFilter(ColorFilter cf) {
if (placeholder != null) {
placeholder.setColorFilter(cf);
}
super.setColorFilter(cf);
}
@Override protected void onBoundsChange(Rect bounds) {
if (placeholder != null) {
placeholder.setBounds(bounds);
}
super.onBoundsChange(bounds);
}
}
我用+1-ed来平衡一个无法解释的-1。什么版本的毕加索?我用的是2.2.1版本。事实上,为了增加对圆形绘图的支持(使用Romain Guy的技术),我已经对原始项目进行了分叉,但这个“问题”发生在标准的毕加索绘图实现中。@JakeWharton我应该在毕加索的GitHub页面上打开一张票,还是这更像是一个功能请求?我无法在master
上重现这种行为。您确定您的修改没有导致此行为吗?ViewUtils.setBackground(mNativeVideoLayout,drawable);什么是ViewUtils和mNativeVideoLayout
Picasso
.with(this)
.load("http://yourimage")
.into(new Target() {
@Override
public void onBitmapLoaded(Bitmap bitmap, Picasso.LoadedFrom from) {
CustomPicassoDrawable drawable = new CustomPicassoDrawable(
FullscreenActivity.this, bitmap, myBackground);
if (android.os.Build.VERSION.SDK_INT >= android.os.Build.VERSION_CODES.JELLY_BEAN) {
myView.setBackground(drawable);
} else {
myView.setBackgroundDrawable(drawable);
}
}
@Override
public void onBitmapFailed(Drawable errorDrawable) {}
@Override
public void onPrepareLoad(Drawable placeHolderDrawable) {}
});