Android一鍵式清理，內(nèi)存清理功能的實(shí)山清理大師等均提供一鍵式清理和一鍵加速等功能。實(shí)際上，它們殺死了一些后臺(tái)進(jìn)程以達(dá)到釋放內(nèi)存的目的。

基本思想是列出所有正在運(yùn)行的進(jìn)程，檢查它們的重要值(RunningAppProcessInfo.importance，該值越大，進(jìn)程的重要性越低)，可以設(shè)置一個(gè)閾值，如果過(guò)程大于閾值，則可以終止該過(guò)程。

該過(guò)程的重要性具有以下級(jí)別：

/**

* Constant for {@link #importance}: this is a persistent process.

* Only used when reporting to process observers.

* @hide

*/

public static final int IMPORTANCE_PERSISTENT = 50;

/**

* Constant for {@link #importance}: this process is running the

* foreground UI.

*/

public static final int IMPORTANCE_FOREGROUND = 100;

/**

* Constant for {@link #importance}: this process is running something

* that is actively visible to the user, though not in the immediate

* foreground.

*/

public static final int IMPORTANCE_VISIBLE = 200;

/**

* Constant for {@link #importance}: this process is running something

* that is considered to be actively perceptible to the user. An

* example would be an application performing background music playback.

*/

public static final int IMPORTANCE_PERCEPTIBLE = 130;

/**

* Constant for {@link #importance}: this process is running an

* application that can not save its state, and thus can't be killed

* while in the background.

* @hide

*/

public static final int IMPORTANCE_CANT_SAVE_STATE = 170;

/**

* Constant for {@link #importance}: this process is contains services

* that should remain running.

*/

public static final int IMPORTANCE_SERVICE = 300;

/**

* Constant for {@link #importance}: this process process contains

* background code that is expendable.

*/

public static final int IMPORTANCE_BACKGROUND = 400;

/**

* Constant for {@link #importance}: this process is empty of any

* actively running code.

*/

public static final int IMPORTANCE_EMPTY = 500;

需要權(quán)限：

具體操作代碼如下：

package com.example.demo;

import java.util.List;

import android.app.Activity;

import android.app.ActivityManager;

import android.app.ActivityManager.MemoryInfo;

import android.app.ActivityManager.RunningAppProcessInfo;

import android.content.Context;

import android.content.pm.PackageManager;

import android.content.pm.PackageManager.NameNotFoundException;

import android.os.Bundle;

import android.util.Log;

import android.view.Menu;

import android.view.MenuItem;

import android.view.View;

import android.widget.Toast;

public class CleanProcessActivity extends Activity {

private static final String TAG = "Clean";

@Override

protected void onCreate(Bundle savedInstanceState) {

super.onCreate(savedInstanceState);

setContentView(R.layout.activity_clean_process);

}

public void clean(View v){

//To change body of implemented methods use File | Settings | File Templates.

ActivityManager am = (ActivityManager) getSystemService(Context.ACTIVITY_SERVICE);

ListinfoList = am.getRunningAppProcesses();

ListserviceInfos = am.getRunningServices(100);

long beforeMem = getAvailMemory(this);

Log.d(TAG, "-----------before memory info : " + beforeMem);

int count = 0;

PackageManager pm = getPackageManager();

if (infoList != null) {

for (int i = 0; i < infoList.size(); ++i) {

RunningAppProcessInfo appProcessInfo = infoList.get(i);

Log.d(TAG, "process name : " + appProcessInfo.processName);

//importance 該進(jìn)程的重要程度 分為幾個(gè)級(jí)別，數(shù)值越低就越重要。

Log.d(TAG, "importance : " + appProcessInfo.importance);

// 一般數(shù)值大于RunningAppProcessInfo.IMPORTANCE_SERVICE的進(jìn)程都長(zhǎng)時(shí)間沒(méi)用或者空進(jìn)程了

// 一般數(shù)值大于RunningAppProcessInfo.IMPORTANCE_VISIBLE的進(jìn)程都是非可見(jiàn)進(jìn)程，也就是在后臺(tái)運(yùn)行著

if (appProcessInfo.importance > RunningAppProcessInfo.IMPORTANCE_VISIBLE) {

String[] pkgList = appProcessInfo.pkgList;

for (int j = 0; j < pkgList.length; ++j) {//pkgList 得到該進(jìn)程下運(yùn)行的包名

String appName = null;

try {

appName = (String) pm.getApplicationLabel(pm.getApplicationInfo(pkgList[j], 0));

} catch (NameNotFoundException e) {

// TODO Auto-generated catch block

e.printStackTrace();

}

Log.d(TAG, "It will be killed, package name : " + pkgList[j]+" -- "+appName );

am.killBackgroundProcesses(pkgList[j]);

count++;

}

}

}

}

long afterMem = getAvailMemory(this);

Log.d(TAG, "----------- after memory info : " + afterMem);

Toast.makeText(this, "clear " + count + " process, "

+ (afterMem - beforeMem) + "M", Toast.LENGTH_LONG).show();

}

private long getAvailMemory(CleanProcessActivity cleanProcessActivity) {

// 獲取android當(dāng)前可用內(nèi)存大小

ActivityManager am = (ActivityManager) getSystemService(Context.ACTIVITY_SERVICE);

MemoryInfo mi = new MemoryInfo();

am.getMemoryInfo(mi);

//mi.availMem; 當(dāng)前系統(tǒng)的可用內(nèi)存

//return Formatter.formatFileSize(context, mi.availMem);// 將獲取的內(nèi)存大小規(guī)格化

Log.d(TAG, "可用內(nèi)存---->>>" + mi.availMem / (1024 * 1024));

return mi.availMem / (1024 * 1024);

}

}

注意：

我在此處選擇的閾值為IMPORTANCE_VISIBLE級(jí)別，這意味著不可見(jiàn)的后臺(tái)進(jìn)程和服務(wù)將被殺死(某些系統(tǒng)進(jìn)程除外)。

清潔效果類(lèi)似于Kingsoft Cleaner和360 Desktop的一鍵式清潔效果。

如果您不想太猛烈地殺死進(jìn)程，則可以選擇IMPORTANCE_SERVICE級(jí)別來(lái)殺死那些長(zhǎng)時(shí)間沒(méi)有用或空的進(jìn)程。此級(jí)別的清理功能不足以實(shí)山清理大師的效果。

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