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/*
* Copyright (C) 2006 The Android Open Source Project
*
* 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 android.content;
/**
* Extended {@link ComponentCallbacks} interface with a new callback for
* finer-grained memory management.
*/
public interface ComponentCallbacks2 extends ComponentCallbacks {
/**
* Level for {@link #onTrimMemory(int)}: the process is nearing the end
* of the background LRU list, and if more memory isn't found soon it will
* be killed.
*/
static final int TRIM_MEMORY_COMPLETE = 80;
/**
* Level for {@link #onTrimMemory(int)}: the process is around the middle
* of the background LRU list; freeing memory can help the system keep
* other processes running later in the list for better overall performance.
*/
static final int TRIM_MEMORY_MODERATE = 60;
/**
* Level for {@link #onTrimMemory(int)}: the process has gone on to the
* LRU list. This is a good opportunity to clean up resources that can
* efficiently and quickly be re-built if the user returns to the app.
*/
static final int TRIM_MEMORY_BACKGROUND = 40;
/**
* Level for {@link #onTrimMemory(int)}: the process had been showing
* a user interface, and is no longer doing so. Large allocations with
* the UI should be released at this point to allow memory to be better
* managed.
*/
static final int TRIM_MEMORY_UI_HIDDEN = 20;
/**
* Called when the operating system has determined that it is a good
* time for a process to trim unneeded memory from its process. This will
* happen for example when it goes in the background and there is not enough
* memory to keep as many background processes running as desired.
*
* @param level The context of the trim, giving a hint of the amount of
* trimming the application may like to perform. May be
* {@link #TRIM_MEMORY_COMPLETE}, {@link #TRIM_MEMORY_MODERATE},
* {@link #TRIM_MEMORY_BACKGROUND}, or {@link #TRIM_MEMORY_UI_HIDDEN}.
*/
void onTrimMemory(int level);
}
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