Android项目实战--手机卫士29--杀死后台进程

昨天，我们就已经把那些进程给读取出来，然后再显示到界面上的啦，那么今天，我们就要做一个功能，那就是把进程杀死，达到我们的一键清理的功能

但是在做这个杀死进程的功能之前，我们先来修复一个bug先，大家先看下面的一张图

细心的朋友们可能就会看到的啦，我们在title上面的进程数目显示的是16个，但是在下面的用户进程和系统进程加起来也就只有13个，竟然会少了三个，那是为什么呢

其实，那少了的三个是因为，它是没有界面的，而且是没有对应的ApplicationInfo对象的，所以当我们通过包名来获取到相应的ApplicationInfo对象的时候，就会报错的啦

因为我们try catch了，所以我们的应用才不会挂掉。

那么我们今天就对这些特殊情况进程处理一下就可以的啦，我们就在catch块里面，把它的包名就设置成应用的名字就行啦，然后再给它加一个默认的图标

package com.xiaobin.security.ui;import java.util.ArrayList;import java.util.List;import android.annotation.SuppressLint;import android.app.Activity;import android.app.ActivityManager;import android.app.ActivityManager.MemoryInfo;import android.app.ActivityManager.RunningAppProcessInfo;import android.content.Context;import android.os.Bundle;import android.os.Handler;import android.os.Message;import android.view.View;import android.view.View.OnClickListener;import android.view.ViewGroup;import android.view.Window;import android.widget.AdapterView;import android.widget.AdapterView.OnItemClickListener;import android.widget.BaseAdapter;import android.widget.Button;import android.widget.CheckBox;import android.widget.ImageView;import android.widget.LinearLayout;import android.widget.ListView;import android.widget.TextView;import android.widget.Toast;import com.xiaobin.security.R;import com.xiaobin.security.domain.TaskInfo;import com.xiaobin.security.engine.TaskInfoProvider;import com.xiaobin.security.utils.TextFormater;public class ProcessManagerActivity extends Activity implements OnClickListener{private static final int LOAD_FINISH = 1;private TextView tv_process_count;private TextView tv_process_memory;private LinearLayout ll_process_load;private ListView lv_process_list;private Button bt_process_clear;private Button bt_process_setting;private CheckBox cb_process_state;private ActivityManager activityManager;private List<RunningAppProcessInfo> runningAppProcessInfos;private TaskInfoProvider taskInfoProvider;private List<TaskInfo> taskInfos;private TaskInfoAdapter adapter;private List<TaskInfo> userTaskInfos;private List<TaskInfo> systemTaskInfos;@SuppressLint("HandlerLeak")private Handler handler = new Handler(){public void handleMessage(Message msg){switch (msg.what){case LOAD_FINISH:ll_process_load.setVisibility(View.INVISIBLE);adapter = new TaskInfoAdapter();lv_process_list.setAdapter(adapter);break;default:break;}}};@Overrideprotected void onCreate(Bundle savedInstanceState){super.onCreate(savedInstanceState);activityManager = (ActivityManager) getSystemService(Context.ACTIVITY_SERVICE);// 请求一个自己定义的title，但有一些Android系统是被修改过的，// 所以有可能是无法请求的，如乐Phone或小米的手机，这些系统是被修改过的，// 所以就要判断一下是否请求成功boolean flags = requestWindowFeature(Window.FEATURE_CUSTOM_TITLE);setContentView(R.layout.process_manager);if (flags){// 设置自定义的titlegetWindow().setFeatureInt(Window.FEATURE_CUSTOM_TITLE,R.layout.process_manager_title);}tv_process_count = (TextView) findViewById(R.id.tv_process_count);tv_process_memory = (TextView) findViewById(R.id.tv_process_memory);ll_process_load = (LinearLayout) findViewById(R.id.ll_process_load);lv_process_list = (ListView) findViewById(R.id.lv_process_list);bt_process_clear = (Button) findViewById(R.id.bt_process_clear);bt_process_setting = (Button) findViewById(R.id.bt_process_setting);bt_process_clear.setOnClickListener(this);bt_process_setting.setOnClickListener(this);initData();lv_process_list.setOnItemClickListener(new OnItemClickListener(){@Overridepublic void onItemClick(AdapterView<?> parent, View view,int position, long id){// adapter里面的getItem返回的值Object obj = lv_process_list.getItemAtPosition(position);if (obj instanceof TaskInfo){cb_process_state = (CheckBox) view.findViewById(R.id.cb_process_manager_state);TaskInfo taskInfo = (TaskInfo) obj;if (taskInfo.isCheck()){taskInfo.setCheck(false);cb_process_state.setChecked(false);}else{taskInfo.setCheck(true);cb_process_state.setChecked(true);}}}});}@Overridepublic void onClick(View v){switch (v.getId()){case R.id.bt_process_clear:killTask();break;case R.id.bt_process_setting:break;default:break;}}private void initData(){// 因为这个title是要显示当前进程数目和可用内存的，所以我们每次在这里都调用一下，以更新数据initTitle();ll_process_load.setVisibility(View.VISIBLE);new Thread(new Runnable(){@Overridepublic void run(){taskInfoProvider = new TaskInfoProvider(ProcessManagerActivity.this);taskInfos = taskInfoProvider.getAllTask(runningAppProcessInfos);Message msg = new Message();msg.what = LOAD_FINISH;handler.sendMessage(msg);}}).start();}// 拿到当前运行的进程数目private int getRunningAppCount(){runningAppProcessInfos = activityManager.getRunningAppProcesses();return runningAppProcessInfos.size();}// 拿到系统剩余的内存private String getAvailMemory(){// new一个内存的对象MemoryInfo memoryInfo = new ActivityManager.MemoryInfo();// 拿到现在系统里面的内存信息activityManager.getMemoryInfo(memoryInfo);// 拿到有效的内存空间long size = memoryInfo.availMem;return TextFormater.dataSizeFormat(size);}// 设置title的信息private void initTitle(){tv_process_count.setText("进程数目：" + getRunningAppCount());tv_process_memory.setText("剩余内存：" + getAvailMemory());}// 一键清理的函数private void killTask(){int total = 0;int memorySize = 0;for (TaskInfo taskInfo : systemTaskInfos){if (taskInfo.isCheck()){// 杀死进程activityManager.killBackgroundProcesses(taskInfo.getPackageName());total++;memorySize += taskInfo.getMemory();taskInfos.remove(taskInfo);}}for (TaskInfo taskInfo : userTaskInfos){if (taskInfo.isCheck()){activityManager.killBackgroundProcesses(taskInfo.getPackageName());total++;memorySize += taskInfo.getMemory();taskInfos.remove(taskInfo);}}Toast.makeText(this,"已经杀死了" + total + "个进程！释放了"+ TextFormater.getSizeFromKB(memorySize) + "空间",Toast.LENGTH_SHORT).show();// 重新加载界面adapter = new TaskInfoAdapter();lv_process_list.setAdapter(adapter);}// ===========================================================================private class TaskInfoAdapter extends BaseAdapter{public TaskInfoAdapter(){// 存放用户的应用进程userTaskInfos = new ArrayList<TaskInfo>();// 存放系统的应用进程systemTaskInfos = new ArrayList<TaskInfo>();for (TaskInfo taskInfo : taskInfos){if (taskInfo.isSystemProcess()){systemTaskInfos.add(taskInfo);}else{userTaskInfos.add(taskInfo);}}}@Overridepublic int getCount(){// 加上两个标签，一个是系统标签，一个是用户标签return taskInfos.size() + 2;}@Overridepublic Object getItem(int position){if (position == 0){return 0; // 显示成用户应用的标签}else if (position <= userTaskInfos.size()){return userTaskInfos.get(position - 1); // 用户应用进程的条目}else if (position == userTaskInfos.size() + 1){return position; // 显示成系统进程的标签}else if (position <= taskInfos.size() + 2){// 系统应用进程的条目return systemTaskInfos.get(position - userTaskInfos.size() - 2);}else{return position;}}@Overridepublic long getItemId(int position){return position;}@Overridepublic View getView(int position, View convertView, ViewGroup parent){View view;TaskInfoViews views;TaskInfo taskInfo;if (position == 0){// 显示成用户应用的标签return newTextView("用户进程(" + userTaskInfos.size() + ")");}else if (position <= userTaskInfos.size()){// 用户应用进程的条目taskInfo = userTaskInfos.get(position - 1);}else if (position == userTaskInfos.size() + 1){// 显示成系统进程的标签return newTextView("系统进程(" + systemTaskInfos.size() + ")");}else if (position <= taskInfos.size() + 2){// 系统应用进程的条目taskInfo = systemTaskInfos.get(position - userTaskInfos.size()- 2);}else{taskInfo = new TaskInfo();}if (convertView == null || convertView instanceof TextView){view = View.inflate(ProcessManagerActivity.this,R.layout.process_manager_item, null);views = new TaskInfoViews();views.iv_process_icon = (ImageView) view.findViewById(R.id.iv_process_manager_icon);views.tv_process_name = (TextView) view.findViewById(R.id.tv_process_manager_name);views.tv_process_memory = (TextView) view.findViewById(R.id.tv_process_manager_memory);views.cb_process_state = (CheckBox) view.findViewById(R.id.cb_process_manager_state);view.setTag(views);}else{view = convertView;views = (TaskInfoViews) view.getTag();}views.iv_process_icon.setImageDrawable(taskInfo.getIcon());views.tv_process_name.setText(taskInfo.getName());views.tv_process_memory.setText("占用内存："+ TextFormater.getSizeFromKB(taskInfo.getMemory()));views.cb_process_state.setChecked(taskInfo.isCheck());return view;}private TextView newTextView(String title){TextView tv_title = new TextView(ProcessManagerActivity.this);tv_title.setText(title);return tv_title;}}private class TaskInfoViews{ImageView iv_process_icon;TextView tv_process_name;TextView tv_process_memory;CheckBox cb_process_state;}}

最后，和大家说一下

为了方便大家的交流，我创建了一个群，这样子大家有什么疑问也可以在群上交流

群号是298440981

今天源码下载

1楼simylau1小时前

楼主文风很赞n通俗易懂深入浅出n不会很枯燥

Re: u0114855311小时前

回复simylaun谢谢支持啦！