Android编程实现任务管理器的方法

本文实例讲述了Android编程实现任务管理器的方法。分享给大家供大家参考，具体如下：
任务管理器可以实现的功能有：

1.查看当前系统下运行的所有的进程
2.可以查看每个进程的进程号、版本号以及内存占用情况
3.杀死进程（可以杀死全部进程或者杀死指定的进程）
4.查看系统剩余内存

效果图：

杀死全部进程

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：

protected void initData() {
  runningAppProcessInfos =ActivityManager.getRunningAppProcesses(); //获取所有的进程
  userRunningAppProcessInfos = new ArrayList();//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。

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();
  }
  
  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;
    }
  }
  
  public String getAppVersion(String packname){
     try {
PackageInfo packinfo =  pm.getPackageInfo(packname, 0);
return packinfo.versionName;
      } catch (NameNotFoundException e) {
 e.printStackTrace();
 return null;
      }
  }
  
  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;
      }
  }
  
  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;
      }
  }
  
  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;
      }
  }
}

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();
}

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();
}

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";

希望本文所述对大家Android程序设计有所帮助。