获取手机的process进程数量和手机的可用内存与总内存大小

import java.io.BufferedReader;
import java.io.File;
import java.io.FileInputStream;
import java.io.InputStreamReader;
import java.util.ArrayList;
import java.util.List;

import android.app.ActivityManager;
import android.app.ActivityManager.RunningAppProcessInfo;
import android.content.Context;
import android.content.pm.ApplicationInfo;
import android.content.pm.PackageManager;
import android.content.pm.PackageManager.NameNotFoundException;
import android.graphics.drawable.Drawable;
import android.os.Debug.MemoryInfo;

import com.android.hzy.mobilesafe.R;
import com.android.hzy.mobilesafe.domain.TaskInfo;

public class TaskUtils {

    /**
     * 得到当前正在运行的进程的数量
     * @param context
     * @return
     */
    public static int getRunningAppProcessInfoSize(Context context){
        
        ActivityManager am = (ActivityManager) context.getSystemService(Context.ACTIVITY_SERVICE);
        return am.getRunningAppProcesses().size();
    }
    
    /**
     * 得到当前系统的可用内存
     * @param context
     * @return
     */
    public static long getAvailMem(Context context){
        
        ActivityManager am = (ActivityManager) context.getSystemService(Context.ACTIVITY_SERVICE);
        android.app.ActivityManager.MemoryInfo outInfo = new android.app.ActivityManager.MemoryInfo();
        am.getMemoryInfo(outInfo);
        long availMem = outInfo.availMem;
        return availMem;
    }
    
    
    /**
     * 得到进程所有的信息
     * @param context
     * @return
     */
    public static List<TaskInfo> getTaskInfos(Context context){
        
        List<TaskInfo> taskInfos = new ArrayList<TaskInfo>();
        
        PackageManager pm = context.getPackageManager();
        ActivityManager am = (ActivityManager) context.getSystemService(Context.ACTIVITY_SERVICE);
        List<RunningAppProcessInfo> runningAppProcesses = am.getRunningAppProcesses();
        for (RunningAppProcessInfo info : runningAppProcesses) {
            
            TaskInfo taskInfo = new TaskInfo();
            
            String packageName = info.processName;
            taskInfo.setPackageName(packageName);
            try {
                ApplicationInfo appInfo = pm.getApplicationInfo(packageName, 0);
                Drawable task_icon = appInfo.loadIcon(pm);
                String task_name = appInfo.loadLabel(pm).toString();
                if(task_icon == null){
                    // 系统应用有的可能没有图标  设置一个默认的图标
                    taskInfo.setTask_icon(context.getResources().getDrawable(R.drawable.ic_launcher));
                }else{
                    taskInfo.setTask_icon(task_icon);
                }
                taskInfo.setTask_name(task_name);
                
            } catch (NameNotFoundException e) {
                // TODO Auto-generated catch block
                e.printStackTrace();
                taskInfo.setTask_icon(context.getResources().getDrawable(R.drawable.ic_launcher));
                taskInfo.setTask_name(packageName);
            }
            
            int pid = info.pid;
            taskInfo.setPid(pid);
            
            MemoryInfo[] memoryInfos = am.getProcessMemoryInfo(new int[]{pid});
            MemoryInfo memoryInfo = memoryInfos[0];
            long totalMem = memoryInfo.getTotalPrivateDirty(); //总内存 KB单位
            taskInfo.setTask_memeory(totalMem);
            
            taskInfos.add(taskInfo);
        }
        
        return taskInfos;
    }
    
    /**
     * 获取手机的总内存
     * @param context
     * @return
     */
    public static long getTotalRam(Context context){
        
        try {
            File file = new File("/proc/meminfo");
            FileInputStream fis = new FileInputStream(file);
            BufferedReader br = new BufferedReader(new InputStreamReader(fis));
            String totalRam = br.readLine();
            StringBuffer sb = new StringBuffer();
            char[] cs = totalRam.toCharArray();
            for (char c : cs) {
                if(c>='0' && c<='9'){
                    sb.append(c);
                }
            }
            long result = Long.parseLong(sb.toString())*1024;
            return result;
        } catch (Exception e) {
            // TODO Auto-generated catch block
            e.printStackTrace();
            return 0;
        }
        
    }
}