Question

我正在尝试开发一种服务，无论何时用户打开应用，我的服务都会识别它。我正在使用这些文件：/ proc / [pid] / cgroup，/ proc / [pid] / cmdline，/ proc / [pid] / oom_score，/ proc / [pid] / oom_score_adj来检查它是否是＆＃39 ; s是在前台运行的用户应用程序。实际上它正在工作但是当我尝试打开任何游戏时，服务一直都不会识别它。（该服务仅识别具有最低值的文件（oom_score）。

示例：oom_score for＆＃34; com.google.android.googlequicksearchbox：interactor＆＃34;是75，但对于＆＃34; com.king.candycrushsaga＆＃34;将是> 150，因此代码永远不会检测到它（如下所示）。

服务代码：

scheduler.scheduleAtFixedRate(new Runnable() {
    @Override
    public void run() {
        s=appManager.getAppRunningForeground();
        System.out.println(s);
    }
},1,2,SECONDS);

让应用运行的功能：

private ReadWriteFile readWriteFile = new ReadWriteFile();
public String getAppRunningForeground(){
    int pid;
    File[] files = new File("/proc").listFiles();
    int lowestOomScore = Integer.MAX_VALUE;
    String foregroundProcess = null;
    for (File file : files) {
        if (!file.isDirectory() || (!file.getName().matches(("\\d+"))))
            continue;
        pid = Integer.parseInt(file.getName());
        try {
            String cgroup = readWriteFile.read(String.format("/proc/%d/cgroup", pid));
            String[] lines = cgroup.split("\n");
            if (lines.length != 2)
                continue;
            String cpuSubsystem = lines[0];
            String cpuaccctSubsystem = lines[1];
            if (!cpuaccctSubsystem.endsWith(Integer.toString(pid)) || cpuSubsystem.endsWith("bg_non_interactive"))
                continue;
            String cmdline = readWriteFile.read(String.format("/proc/%d/cmdline", pid));
            if (cmdline.contains("com.android.systemui")||cmdline.contains("com.google.android.googlequicksearchbox:interactor")) {
                continue;
            }
            int uid = Integer.parseInt(cpuaccctSubsystem.split(":")[2].split("/")[1].replace("uid_", ""));
            if (uid > 1000 && uid <= 1038)//System process
                continue;
            File oomScoreAdj = new File(String.format("/proc/%d/oom_score_adj", pid));
            if (oomScoreAdj.canRead()) {
                int oomAdj = Integer.parseInt(readWriteFile.read(oomScoreAdj.getAbsolutePath()));
                if (oomAdj != 0) {
                    continue;
                }
            }
            int oomscore = Integer.parseInt(readWriteFile.read(String.format("/proc/%d/oom_score", pid)));
            if (oomscore < lowestOomScore) {
                lowestOomScore = oomscore;
                foregroundProcess = cmdline.replaceAll("\\p{Cntrl}", "");
            }

        } catch (IOException e) {
            e.printStackTrace();
        }
    }
    return foregroundProcess;
}

读取文件的类。

public class ReadWriteFile{
    File file;
    StringBuilder teste3 = new StringBuilder();
    FileOutputStream outputStream;
    public static String read(String path) throws IOException {
        StringBuilder output = new StringBuilder();
        BufferedReader reader = new BufferedReader(new FileReader(path));
        output.append(reader.readLine());
        for (String line = reader.readLine(); line != null; line = reader.readLine())
            output.append('\n').append(line);
        reader.close();
        return output.toString();
    }
}

P.S：不推荐使用getRunningTasks，所以请不要提出建议。

Answer 1

您可以使用在android api 21中添加的UsageStatsManager类。请参阅this 问题由me提出并回答。

上面的答案将为您提供一个已排序的应用程序ArrayList，所需的前台应用程序将在ArrayList上的第一个索引号为0。

希望这会有所帮助。

Answer 2

此方法可以帮助您

  void checkForegroundAppCompat()
        {
            ActivityManager activityManager = (ActivityManager) getSystemService(Context.ACTIVITY_SERVICE);
            final List<ActivityManager.RunningTaskInfo> taskInfo = activityManager.getRunningTasks(1);
            final ComponentName componentName = taskInfo.get(0).topActivity;
            if(!getWhiteListedPackages().contains(componentName.getPackageName()) &&
                    SecurityStatusManager.isAppsBlockingEnabled(this))
            {
                int pid = android.os.Process.getUidForName(componentName.getPackageName());
// Kill blick APP here               
  GRLog.w("KILL Blacklist App Package: " + componentName.getPackageName() + " with pid: " + pid);
                killApp(componentName.getPackageName(), pid);
            }
        }

Android，如何在前台获取应用程序

2 个答案: