public static List<TaskInfo> getTaskInfos(Context context)  {
        //首先獲取到程序管理器
        ActivityManager activityManager = (ActivityManager) context.getSystemService(Context.ACTIVITY_SERVICE);
        //獲取到執行的程序
        List<ActivityManager.RunningAppProcessInfo> runningAppProcesses = activityManager.getRunningAppProcesses();
        //初始化程序的集合
        List<TaskInfo> taskInfos = new ArrayList<>();
        //迭代所有正在執行的程序
        for (ActivityManager.RunningAppProcessInfo runningAppProcess : runningAppProcesses) {
            TaskInfo taskInfo = new TaskInfo();
            //獲取到程序的名字
            String processName = runningAppProcess.processName;
            taskInfo.setAppPackageName(processName);
            //獲取到程序的記憶體的基本資訊
            Debug.MemoryInfo[] processMemoryInfo = activityManager.getProcessMemoryInfo(new int[]{runningAppProcess.pid});
            int totalPrivateDirty = processMemoryInfo[0].getTotalPrivateDirty() * 1024;
            taskInfo.setMemorySize(totalPrivateDirty);
        }
        return taskInfos;
    }
 

通過讀取系統檔案的方式，獲得執行記憶體大小

 //獲取總記憶體的大小
    private long getTotalMemory() {
//        MemTotal:         341780 kB
        try {
            FileInputStream fis = new FileInputStream(new File("/proc/meminfo"));
            //包裝一個一行行讀取的流
            BufferedReader bufferedReader = new BufferedReader(new InputStreamReader(fis));
            //取到所有的記憶體資訊
            String memTotal = bufferedReader.readLine();

            StringBuffer sb = new StringBuffer();

            for (char c : memTotal.toCharArray()) {

                if (c >= '0' && c <= '9') {
                    sb.append(c);
                }
            }
            //為了方便格式化 所以乘以1024
            long totalMemory = Long.parseLong(sb.toString()) * 1024;

            return totalMemory;

        } catch (Exception e) {
            e.printStackTrace();
            return 0;
        }

    }
 

//獲取到程序管理者
        ActivityManager activityManager = (ActivityManager) getSystemService(ACTIVITY_SERVICE);
        //殺死後臺程序
        activityManager.killBackgroundProcesses(應用程式包名);