Android 一键清理、内存清理功能实现
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360桌面、金山清理大师等都提供了一键清理、一键加速等功能,其实就是杀一些后台进程来达到释放内存的目的。
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;
直接上代码:
- package com.android.clearmemory;
- import android.app.Activity;
- import android.app.ActivityManager;
- import android.app.ActivityManager.MemoryInfo;
- import android.app.ActivityManager.RunningAppProcessInfo;
- import android.content.Context;
- import android.os.Bundle;
- import android.util.Log;
- import android.view.View;
- import android.widget.Button;
- import android.widget.Toast;
- import java.util.List;
- public class ClearMemoryActivity extends Activity {
- private static final String TAG = "ClearMemoryActivity";
- /**
- * Called when the activity is first created.
- */
- @Override
- public void onCreate(Bundle savedInstanceState) {
- super.onCreate(savedInstanceState);
- setContentView(R.layout.main);
- Button clear = (Button) findViewById(R.id.clear);
- clear.setOnClickListener(new View.OnClickListener() {
- @Override
- public void onClick(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(ClearMemoryActivity.this);
- Log.d(TAG, "-----------before memory info : " + beforeMem);
- int count = 0;
- if (infoList != null) {
- for (int i = 0; i < infoList.size(); ++i) {
- RunningAppProcessInfo appProcessInfo = infoList.get(i);
- Log.d(TAG, "process name : " + appProcessInfo.processName);
- //importance 该进程的重要程度 分为几个级别,数值越低就越重要。
- Log.d(TAG, "importance : " + appProcessInfo.importance);
- // 一般数值大于RunningAppProcessInfo.IMPORTANCE_SERVICE的进程都长时间没用或者空进程了
- // 一般数值大于RunningAppProcessInfo.IMPORTANCE_VISIBLE的进程都是非可见进程,也就是在后台运行着
- if (appProcessInfo.importance > RunningAppProcessInfo.IMPORTANCE_VISIBLE) {
- String[] pkgList = appProcessInfo.pkgList;
- for (int j = 0; j < pkgList.length; ++j) {//pkgList 得到该进程下运行的包名
- Log.d(TAG, "It will be killed, package name : " + pkgList[j]);
- am.killBackgroundProcesses(pkgList[j]);
- count++;
- }
- }
- }
- }
- long afterMem = getAvailMemory(ClearMemoryActivity.this);
- Log.d(TAG, "----------- after memory info : " + afterMem);
- Toast.makeText(ClearMemoryActivity.this, "clear " + count + " process, "
- + (afterMem - beforeMem) + "M", Toast.LENGTH_LONG).show();
- }
- });
- ClearMemoryFloatView.instance(getApplicationContext()).createView();
- }
- //获取可用内存大小
- private long getAvailMemory(Context context) {
- // 获取android当前可用内存大小
- ActivityManager am = (ActivityManager) context.getSystemService(Context.ACTIVITY_SERVICE);
- MemoryInfo mi = new MemoryInfo();
- am.getMemoryInfo(mi);
- //mi.availMem; 当前系统的可用内存
- //return Formatter.formatFileSize(context, mi.availMem);// 将获取的内存大小规格化
- 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。
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- Android 一键清理、内存清理功能实现
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