任务管理器

实现思路：

ActivityManager类可以获取到当前系统的所有进程,以及每个进程的信息，也可以杀死某个进程，

ActivityManager.getRunningAppProcesses();   获取系统的所有进程

ActivityManager.getProcessMemoryInfo(pids);  根据进程号获取每个进程的内存占用情况

ActivityManager.restartPackage(processName) ;  根据进程的包名杀死某个进程

 

PackageManager可以根据包名获取程序的图标、版本号、名字、权限、签名

 

核心代码：

/*  * 获取所有进程及用户 的进程  */  protected void initData() {      runningAppProcessInfos =ActivityManager.getRunningAppProcesses(); //获取所有的进程       userRunningAppProcessInfos = new ArrayList<ActivityManager.RunningAppProcessInfo>();//获取用户的进程       for(int i = 0; i< runningAppProcessInfos.size();i++){           if("system".equals(runningAppProcessInfos.get(i).processName)          ||"Android.process.media".equals(runningAppProcessInfos.get(i).processName)          ||"android.process.acore".equals(runningAppProcessInfos.get(i).processName)          ){               continue;           }           userRunningAppProcessInfos.add(runningAppProcessInfos.get(i));      }  }  注：杀死全部进程实际上杀死的是用户的所有进程，系统进程是无法杀死的，所以这里要获取到用户的所有的进程。

 /*  * 获取某个进程占用的内存信息   */  ActivityManager am = (ActivityManager) getSystemService(Context.ACTIVITY_SERVICE);  int[] pids = {userRunningAppProcessInfos.get(position).pid};  Android.os.Debug.MemoryInfo[] memoryInfos =  am.getProcessMemoryInfo(pids);  int memorysize = memoryInfos[0].getTotalPrivateDirty();  tv_app_memory.setText("内存占用为 "+ memorysize +" KB");    public class TaskInfo {      Context context ;      PackageManager pm ;      public TaskInfo(Context context) {          this.context = context;          pm = context.getPackageManager();      }      /*      * 根据包名 查询 图标      */      public Drawable getAppIcon(String packname){        try {               ApplicationInfo info = pm.getApplicationInfo(packname, 0);                return info.loadIcon(pm);          } catch (NameNotFoundException e) {              // TODO Auto-generated catch block               e.printStackTrace();              return null;          }      }            /*      *获取程序的版本号        */      public String getAppVersion(String packname){                      try {                PackageInfo packinfo =    pm.getPackageInfo(packname, 0);                return packinfo.versionName;              } catch (NameNotFoundException e) {                  e.printStackTrace();                  return null;              }      }              /*      * 获取程序的名字       */      public String getAppName(String packname){            try {                   ApplicationInfo info = pm.getApplicationInfo(packname, 0);                    return info.loadLabel(pm).toString();              } catch (NameNotFoundException e) {                  // TODO Auto-generated catch block                   e.printStackTrace();                  return null;              }      }      /*      * 获取程序的权限      */      public String[] getAppPremission(String packname){            try {                PackageInfo packinfo =    pm.getPackageInfo(packname, PackageManager.GET_PERMISSIONS);                //获取到所有的权限                  return packinfo.requestedPermissions;                } catch (NameNotFoundException e) {                  e.printStackTrace();                  return null;              }      }                  /*      * 获取程序的签名       */      public String getAppSignature(String packname){            try {                PackageInfo packinfo =    pm.getPackageInfo(packname, PackageManager.GET_SIGNATURES);                //获取到所有的权限                  return packinfo.signatures[0].toCharsString();                } catch (NameNotFoundException e) {                  e.printStackTrace();                  return null;              }      }  }  /*  * 杀死所有进程   */  private void killAll() {      for (int i = 0 ; i< userRunningAppProcessInfos.size();i++){          System.out.println(userRunningAppProcessInfos.get(i).processName);          activitymanager.restartPackage(userRunningAppProcessInfos.get(i).processName);      }      // 更新显示的界面        pd.show();      new Thread(){          @Override          public void run() {              initData();              Message msg = new Message();              msg.what = GET_RUNNING_APP_FINISH;              hander.sendMessage(msg);          }      }.start();  }    /*  * 杀死选择的进程   */  private void killSelected() {      for (int i=0 ;i < isselected.size(); i++){          if(isselected.get(i)){    //如果用户也选中则返回true               //终止一个activity 需要用到 activitymanager               activitymanager.restartPackage(userRunningAppProcessInfos.get(i).processName);          }      }      //更新listview的显示         pd.show();      new Thread(){          @Override          public void run() {              initData();              Message msg = new Message();              msg.what = GET_RUNNING_APP_FINISH;              hander.sendMessage(msg);          }      }.start();  }    /*  * 获取系统的剩余内存  */  ActivityManager am = (ActivityManager) getSystemService(Context.ACTIVITY_SERVICE);  MemoryInfo outInfo =    new ActivityManager.MemoryInfo();  am.getMemoryInfo(outInfo);  long availMemorySize = outInfo.availMem;  String strMemorySize = availMemorySize/1024/1024 + "MB";