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Android開發中怎么實現一個 一鍵清理、內存清理功能？相信很多沒有經驗的人對此束手無策，為此本文總結了問題出現的原因和解決方法，通過這篇文章希望你能解決這個問題。
360桌面、金山清理大師等都提供了一鍵清理、一鍵加速等功能，其實就是殺一些后臺進程來達到釋放內存的目的。
基本思路就是列出所有運行的進程，查看其重要值（RunningAppProcessInfo.importance，值越大說明進程重要程度越低），可以設定一個閾值，如果該進程的重要值大于該閾值，就可以殺掉該進程。
進程的重要值有以下幾個等級：
/**
* 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;
需要權限：
<uses-permission android:name="android.permission.KILL_BACKGROUND_PROCESSES"/>
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);
List<RunningAppProcessInfo> infoList = am.getRunningAppProcesses();
List<ActivityManager.RunningServiceInfo> serviceInfos = 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 該進程的重要程度 分為幾個級別，數值越低就越重要。
Log.d(TAG, "importance : " + appProcessInfo.importance);
// 一般數值大于RunningAppProcessInfo.IMPORTANCE_SERVICE的進程都長時間沒用或者空進程了
// 一般數值大于RunningAppProcessInfo.IMPORTANCE_VISIBLE的進程都是非可見進程，也就是在后臺運行著
if (appProcessInfo.importance > RunningAppProcessInfo.IMPORTANCE_VISIBLE) {
String[] pkgList = appProcessInfo.pkgList;
for (int j = 0; j < pkgList.length; ++j) {//pkgList 得到該進程下運行的包名
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當前可用內存大小
ActivityManager am = (ActivityManager) getSystemService(Context.ACTIVITY_SERVICE);
MemoryInfo mi = new MemoryInfo();
am.getMemoryInfo(mi);
//mi.availMem; 當前系統的可用內存
//return Formatter.formatFileSize(context, mi.availMem);// 將獲取的內存大小規格化
Log.d(TAG, "可用內存---->>>" + mi.availMem / (1024 * 1024));
return mi.availMem / (1024 * 1024);
}
}
注意：
我這里選擇閾值是IMPORTANCE_VISIBLE級別的，也就是非可見的后臺進程和服務會被殺掉（一些系統進程肯定除外）。
清理的效果跟金山清理大師和360桌面的一鍵清理效果差不多。
如果不想殺的太兇，可以選擇IMPORTANCE_SERVICE級別，殺掉那些長時間沒用或者空進程了，這個級別的清理力度不夠大，達不到金山清理大師的效果。
看完上述內容，你們掌握Android開發中怎么實現一個 一鍵清理、內存清理功能的方法了嗎？如果還想學到更多技能或想了解更多相關內容，歡迎關注億速云行業資訊頻道，感謝各位的閱讀！
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