Android 一键清理、内存清理功能实现
来源:互联网 发布:手机号码标记软件 编辑:程序博客网 时间:2024/04/29 18:12
转:http://blog.csdn.net/chuyouyinghe/article/details/52037846
基本思路就是列出所有运行的进程,查看其重要值(RunningAppProcessInfo.importance,值越大说明进程重要程度越低),可以设定一个阈值,
如果该进程的重要值大于该阈值,就可以杀掉该进程。
进程的重要值有以下几个等级:
- /**
- * 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;
需要权限:
- <uses-permission android:name="android.permission.KILL_BACKGROUND_PROCESSES"/>
具体操作代码如下:
- 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){
-
- 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);
-
- Log.d(TAG, "importance : " + appProcessInfo.importance);
-
-
-
-
-
- if (appProcessInfo.importance > RunningAppProcessInfo.IMPORTANCE_VISIBLE) {
- String[] pkgList = appProcessInfo.pkgList;
- for (int j = 0; j < pkgList.length; ++j) {
- String appName = null;
- try {
- appName = (String) pm.getApplicationLabel(pm.getApplicationInfo(pkgList[j], 0));
- } catch (NameNotFoundException e) {
-
- 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) {
-
- ActivityManager am = (ActivityManager) getSystemService(Context.ACTIVITY_SERVICE);
- MemoryInfo mi = new MemoryInfo();
- am.getMemoryInfo(mi);
-
-
- Log.d(TAG, "可用内存---->>>" + mi.availMem / (1024 * 1024));
- return mi.availMem / (1024 * 1024);
- }
- }
注意:
我这里选择阈值是IMPORTANCE_VISIBLE级别的,也就是非可见的后台进程和服务会被杀掉(一些系统进程肯定除外)。
清理的效果跟金山清理大师和360桌面的一键清理效果差不多。
如果不想杀的太凶,可以选择IMPORTANCE_SERVICE级别,杀掉那些长时间没用或者空进程了,
这个级别的清理力度不够大,达不到金山清理大师的效果。
0 0