首先看一下界面：

TaskManagerActivity .java

//進程管理
public class TaskManagerActivity extends Activity {
    @ViewInject(R.id.tv_task_process_count)
    private TextView tv_task_process_count;
    @ViewInject(R.id.tv_task_memory)
    private TextView tv_task_memory;
    @ViewInject(R.id.list_view)
    private ListView list_view;
    private long totalMem;
    private List<TaskInfo> taskInfos;
    private List<TaskInfo> userTaskInfos;
    private List<TaskInfo> systemAppInfos;
    private TaskManagerAdapter adapter;
    private int processCount;
    private long availMem;


    @Override
    protected void onCreate(Bundle savedInstanceState) {
        // TODO Auto-generated method stub
        super.onCreate(savedInstanceState);        
        initUI();
        initData();

    }
    
    @Override
    protected void onResume() {
        // TODO Auto-generated method stub
        super.onResume();        
        if(adapter != null){
            adapter.notifyDataSetChanged();
        }
    }

    private class TaskManagerAdapter extends BaseAdapter {

        @Override
        public int getCount() {
            //判断当前用户是否需要显示系统进程，需要就显示，不需要就不显示            
            boolean result = SharedPreferencesUtils.getBoolean(TaskManagerActivity.this, "is_show_system", false); if(result){
                return userTaskInfos.size() + 1 + systemAppInfos.size() + 1;
            }else{
                return userTaskInfos.size() + 1;
            }        
        }

        @Override
        public Object getItem(int position) {

            if (position == 0) {
                return null;
            } else if (position == userTaskInfos.size() + 1) {
                return null;
            }

            TaskInfo taskInfo;

            if (position < (userTaskInfos.size() + 1)) {
                // 
                taskInfo = userTaskInfos.get(position - 1); 
                                                            
            } else {
                // 
                int location = position - 1 - userTaskInfos.size() - 1;
                taskInfo = systemAppInfos.get(location);
            }
            return taskInfo;
        }

        @Override
        public long getItemId(int position) {
            // TODO Auto-generated method stub
            return position;
        }

        @Override
        public View getView(int position, View convertView, ViewGroup parent) {

            if (position == 0) {
                // 
                TextView tv = new TextView(getApplicationContext());
                tv.setBackgroundColor(Color.GRAY);
                tv.setTextColor(Color.WHITE);
                tv.setText("用户进程：" + userTaskInfos.size() + "个");
                return tv;
            } else if (position == (userTaskInfos.size() + 1)) {
                TextView tv = new TextView(getApplicationContext());
                tv.setBackgroundColor(Color.GRAY);
                tv.setTextColor(Color.WHITE);
                tv.setText("系统进程" + systemAppInfos.size() + "个");
                return tv;
            }
            ViewHolder holder;
            View view;
            if (convertView != null && convertView instanceof LinearLayout) {
                view = convertView;

                holder = (ViewHolder) view.getTag();

            } else {
                view = View.inflate(TaskManagerActivity.this,
                        R.layout.item_task_manager, null);

                holder = new ViewHolder();

                holder.iv_app_icon = (ImageView) view
                        .findViewById(R.id.iv_app_icon);

                holder.tv_app_name = (TextView) view
                        .findViewById(R.id.tv_app_name);

                holder.tv_app_memory_size = (TextView) view
                        .findViewById(R.id.tv_app_memory_size);

                holder.tv_app_status = (CheckBox) view
                        .findViewById(R.id.tv_app_status);

                view.setTag(holder);
            }

            TaskInfo taskInfo;

            if (position < (userTaskInfos.size() + 1)) {
                // 
                taskInfo = userTaskInfos.get(position - 1);
                                                                        } else {
                // 
                int location = position - 1 - userTaskInfos.size() - 1;
                taskInfo = systemAppInfos.get(location);
            }
           
            holder.iv_app_icon.setImageDrawable(taskInfo.getIcon());

            holder.tv_app_name.setText(taskInfo.getAppName());

            holder.tv