Java tutorial
/* * Copyright (C) 2013 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 com.llf.android.launcher3; import java.util.ArrayList; import java.util.List; import android.app.ActivityManager; import android.app.Service; import android.content.Context; import android.content.Intent; import android.os.Binder; import android.os.Debug; import android.os.Handler; import android.os.IBinder; import android.os.Message; import android.os.SystemClock; import android.support.v4.util.LongSparseArray; import android.util.Log; public class MemoryTracker extends Service { public static final String TAG = MemoryTracker.class.getSimpleName(); public static final String ACTION_START_TRACKING = "com.android.launcher3.action.START_TRACKING"; private static final long UPDATE_RATE = 5000; private static final int MSG_START = 1; private static final int MSG_STOP = 2; private static final int MSG_UPDATE = 3; public static class ProcessMemInfo { public int pid; public String name; public long startTime; public long currentPss, currentUss; public long[] pss = new long[256]; public long[] uss = new long[256]; // = new Meminfo[(int) (30 * 60 / (UPDATE_RATE / 1000))]; // 30 minutes public long max = 1; public int head = 0; public ProcessMemInfo(int pid, String name, long start) { this.pid = pid; this.name = name; this.startTime = start; } public long getUptime() { return System.currentTimeMillis() - startTime; } }; public final LongSparseArray<ProcessMemInfo> mData = new LongSparseArray<ProcessMemInfo>(); public final ArrayList<Long> mPids = new ArrayList<Long>(); private int[] mPidsArray = new int[0]; private final Object mLock = new Object(); Handler mHandler = new Handler() { @Override public void handleMessage(Message m) { switch (m.what) { case MSG_START: mHandler.removeMessages(MSG_UPDATE); mHandler.sendEmptyMessage(MSG_UPDATE); break; case MSG_STOP: mHandler.removeMessages(MSG_UPDATE); break; case MSG_UPDATE: update(); mHandler.removeMessages(MSG_UPDATE); mHandler.sendEmptyMessageDelayed(MSG_UPDATE, UPDATE_RATE); break; } } }; ActivityManager mAm; public static void startTrackingMe(Context context, String name) { context.startService(new Intent(context, MemoryTracker.class).setAction(MemoryTracker.ACTION_START_TRACKING) .putExtra("pid", android.os.Process.myPid()).putExtra("name", name)); } public ProcessMemInfo getMemInfo(int pid) { return mData.get(pid); } public int[] getTrackedProcesses() { return mPidsArray; } public void startTrackingProcess(int pid, String name, long start) { synchronized (mLock) { final Long lpid = new Long(pid); if (mPids.contains(lpid)) return; mPids.add(lpid); updatePidsArrayL(); mData.put(pid, new ProcessMemInfo(pid, name, start)); } } void updatePidsArrayL() { final int N = mPids.size(); mPidsArray = new int[N]; StringBuffer sb = new StringBuffer("Now tracking processes: "); for (int i = 0; i < N; i++) { final int p = mPids.get(i).intValue(); mPidsArray[i] = p; sb.append(p); sb.append(" "); } Log.v(TAG, sb.toString()); } void update() { synchronized (mLock) { Debug.MemoryInfo[] dinfos = mAm.getProcessMemoryInfo(mPidsArray); for (int i = 0; i < dinfos.length; i++) { Debug.MemoryInfo dinfo = dinfos[i]; if (i > mPids.size()) { Log.e(TAG, "update: unknown process info received: " + dinfo); break; } final long pid = mPids.get(i).intValue(); final ProcessMemInfo info = mData.get(pid); info.head = (info.head + 1) % info.pss.length; info.pss[info.head] = info.currentPss = dinfo.getTotalPss(); info.uss[info.head] = info.currentUss = dinfo.getTotalPrivateDirty(); if (info.currentPss > info.max) info.max = info.currentPss; if (info.currentUss > info.max) info.max = info.currentUss; // Log.v(TAG, "update: pid " + pid + " pss=" + info.currentPss + // " uss=" + info.currentUss); if (info.currentPss == 0) { Log.v(TAG, "update: pid " + pid + " has pss=0, it probably died"); mData.remove(pid); } } for (int i = mPids.size() - 1; i >= 0; i--) { final long pid = mPids.get(i).intValue(); if (mData.get(pid) == null) { mPids.remove(i); updatePidsArrayL(); } } } } @Override public void onCreate() { mAm = (ActivityManager) getSystemService(Context.ACTIVITY_SERVICE); // catch up in case we crashed but other processes are still running List<ActivityManager.RunningServiceInfo> svcs = mAm.getRunningServices(256); for (ActivityManager.RunningServiceInfo svc : svcs) { if (svc.service.getPackageName().equals(getPackageName())) { Log.v(TAG, "discovered running service: " + svc.process + " (" + svc.pid + ")"); startTrackingProcess(svc.pid, svc.process, System.currentTimeMillis() - (SystemClock.elapsedRealtime() - svc.activeSince)); } } List<ActivityManager.RunningAppProcessInfo> procs = mAm.getRunningAppProcesses(); for (ActivityManager.RunningAppProcessInfo proc : procs) { final String pname = proc.processName; if (pname.startsWith(getPackageName())) { Log.v(TAG, "discovered other running process: " + pname + " (" + proc.pid + ")"); startTrackingProcess(proc.pid, pname, System.currentTimeMillis()); } } } @Override public void onDestroy() { mHandler.sendEmptyMessage(MSG_STOP); } @Override public int onStartCommand(Intent intent, int flags, int startId) { Log.v(TAG, "Received start id " + startId + ": " + intent); if (intent != null) { if (ACTION_START_TRACKING.equals(intent.getAction())) { final int pid = intent.getIntExtra("pid", -1); final String name = intent.getStringExtra("name"); final long start = intent.getLongExtra("start", System.currentTimeMillis()); startTrackingProcess(pid, name, start); } } mHandler.sendEmptyMessage(MSG_START); return START_STICKY; } public class MemoryTrackerInterface extends Binder { MemoryTracker getService() { return MemoryTracker.this; } } private final IBinder mBinder = new MemoryTrackerInterface(); @Override public IBinder onBind(Intent intent) { mHandler.sendEmptyMessage(MSG_START); return mBinder; } }