Android 无法重用片段以使用LruCache
我正在使用Google的示例跨配置更改缓存位图,几乎是逐行缓存: 当一个字段更新时,我调用addBitmapToMemoryCache,这是在配置更改(设备旋转)之前。但是,将调试信息放入findOrCreateRetainFragment后:Android 无法重用片段以使用LruCache,android,android-fragments,android-lru-cache,Android,Android Fragments,Android Lru Cache,我正在使用Google的示例跨配置更改缓存位图,几乎是逐行缓存: 当一个字段更新时,我调用addBitmapToMemoryCache,这是在配置更改(设备旋转)之前。但是,将调试信息放入findOrCreateRetainFragment后: public static RetainFragment findOrCreateRetainFragment(FragmentManager fm) { RetainFragment fragment = (RetainFragment) f
public static RetainFragment findOrCreateRetainFragment(FragmentManager fm) {
RetainFragment fragment = (RetainFragment) fm.findFragmentByTag(TAG);
if (fragment == null) {
fragment = new RetainFragment();
Log.w("myapp", "instanciating new retainfragment");
fm.beginTransaction().add(fragment, TAG).commit();
} else {
Log.w("myapp", "using old retainfragment");
}
return fragment;
}
片段总是新实例化的,因此我永远无法访问旧的LruCache,尽管setRetainInstance(true)
。谷歌的例子有什么问题吗?我正在使用v4支持FragmentManager
以下是我的onCreate的相关部分:
RetainFragment retainFragment =
RetainFragment.findOrCreateRetainFragment(getSupportFragmentManager());
mMemoryCache = retainFragment.mRetainedCache;
if (mMemoryCache == null) {
mMemoryCache = new LruCache<String, Bitmap>(3 * 1024 * 1024) {
@Override
protected int sizeOf(String key, Bitmap bitmap) {
return bitmap.getByteCount() / 1024;
}
};
retainFragment.mRetainedCache = mMemoryCache;
} else {
backgroundsByMonth = new ArrayList<>();
for (int i = 0; i < 12; i++) {
BitmapDrawable bd = new BitmapDrawable(getResources(), mMemoryCache.get(Integer.toString(i)));
backgroundsByMonth.add(bd);
}
}
RetainFragment RetainFragment=
findOrCreateRetainFragment(getSupportFragmentManager());
mMemoryCache=retainFragment.mRetainedCache;
if(mMemoryCache==null){
mMemoryCache=新的LruCache(3*1024*1024){
@凌驾
受保护的int-sizeOf(字符串键、位图){
返回bitmap.getByteCount()/1024;
}
};
retainFragment.mRetainedCache=mMemoryCache;
}否则{
backgroundsByMonth=新的ArrayList();
对于(int i=0;i<12;i++){
BitmapDrawable bd=新的BitmapDrawable(getResources(),mMemoryCache.get(Integer.toString(i));
背景bmonth.add(bd);
}
}
结果是,我的onSaveInstanceState没有调用超类onSaveInstanceState,这导致片段管理器丢失片段实例。添加
super.onSaveInstanceState(out);
已修复。能否将您的
添加到上面的创建方法中?