本文共 5667 字，大约阅读时间需要 18 分钟。

1、进程的数据封装类

import android.graphics.drawable.Drawable;/** * 进程的数据封装类 * @author Administrator * */public class TaskBean {
       private boolean isChecked;//是否被选中    private Drawable icon;//apk的图标    private String name;//apk的名字    private String packName;//apk的包名    private long memSize;//apk占用的内存大小    private boolean isSystem;//是否系统apk    public Drawable getIcon() {        return icon;    }    public void setIcon(Drawable icon) {        this.icon = icon;    }    public String getName() {        return name;    }    public void setName(String name) {        this.name = name;    }    public String getPackName() {        return packName;    }    public void setPackName(String packName) {        this.packName = packName;    }    public long getMemSize() {        return memSize;    }    public void setMemSize(long memSize) {        this.memSize = memSize;    }    public boolean isSystem() {        return isSystem;    }    public void setSystem(boolean isSystem) {        this.isSystem = isSystem;    }    public boolean isChecked() {        return isChecked;    }    public void setChecked(boolean isChecked) {        this.isChecked = isChecked;    }}

2、获取所有运行中进程的信息工具类

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.MemoryInfo;import android.app.ActivityManager.RunningAppProcessInfo;import android.content.Context;import android.content.pm.ApplicationInfo;import android.content.pm.PackageInfo;import android.content.pm.PackageManager;import android.content.pm.PackageManager.NameNotFoundException;/** * 获取所有运行中进程的信息 *  * @author Administrator *  */public class TaskManagerEngine {
       /**     * @return 所有运行中的进程数据     */    public static List
   
     getAllRunningTaskInfos(Context context) {        List
    
      datas = new ArrayList
     
      ();        // 获取运行中的进程        ActivityManager am = (ActivityManager) context                .getSystemService(Context.ACTIVITY_SERVICE);        // 获取包管理器        PackageManager pm = context.getPackageManager();        // 获取运行中的进程            List
      
        runningAppProcesses = am                    .getRunningAppProcesses();            for (RunningAppProcessInfo runningAppProcessInfo : runningAppProcesses) {                TaskBean bean = new TaskBean();                // apk的 包名                String processName = runningAppProcessInfo.processName;// 包名                // 设置apk的包名                bean.setPackName(processName);                // 获取apk的图标和名字                //有些进程是无名进程                PackageInfo packageInfo = null;                try {                    packageInfo = pm.getPackageInfo(processName, 0);                } catch (NameNotFoundException e) {                    continue;//继续循环 不添加没有名字的进程                }                //获取apk的图标                bean.setIcon(packageInfo.applicationInfo.loadIcon(pm));                //获取apk的名字                bean.setName(packageInfo.applicationInfo.loadLabel(pm) + "");                if ((packageInfo.applicationInfo.flags & ApplicationInfo.FLAG_SYSTEM) != 0){                    //系统apk                    bean.setSystem(true);                } else {                    bean.setSystem(false);//用户apk                 }                //获取占用的内存大小                android.os.Debug.MemoryInfo[] processMemoryInfo = am.getProcessMemoryInfo(new int[]{runningAppProcessInfo.pid});                //获取占用内存 以byte单位                long totalPrivateDirty = processMemoryInfo[0].getTotalPrivateDirty() * 1024;// 获取运行中占用的内存                bean.setMemSize(totalPrivateDirty);                datas.add(bean);// 添加一个进程信息            } // end for        return datas;    }    /**     * @return 获取可用内存的大小     */    public static long getAvailMemSize(Context context) {        long size = 0;        ActivityManager am = (ActivityManager) context                .getSystemService(Context.ACTIVITY_SERVICE);        MemoryInfo outInfo = new MemoryInfo();        // MemoryInfo 存放内存的信息        am.getMemoryInfo(outInfo);        // 把kb 转换成byte        size = outInfo.availMem;        return size;    }    /**     * @return 总内存大小     */    public static long getTotalMemSize(Context context) {        long size = 0;        /*         * //Activity管理器,获取运行相关信息 ActivityManager am = (ActivityManager)         * context.getSystemService(Context.ACTIVITY_SERVICE);         *          * MemoryInfo outInfo = new MemoryInfo(); //MemoryInfo 存放内存的信息         * am.getMemoryInfo(outInfo ); //获取总内存大小，16级别以上 ,读取内存文件 size =         * outInfo.totalMem;         */        // 读取配置文件来获取总内存大小        File file = new File("/proc/meminfo");        try {            BufferedReader reader = new BufferedReader(new InputStreamReader(                    new FileInputStream(file)));            // //zip流 pipe流            String totalMemInfo = reader.readLine();            int startIndex = totalMemInfo.indexOf(':');            int endIndex = totalMemInfo.indexOf('k');            // 单位是kb            totalMemInfo = totalMemInfo.substring(startIndex + 1, endIndex)                    .trim();            size = Long.parseLong(totalMemInfo);            size *= 1024;// byte单位        } catch (Exception e) {            // TODO Auto-generated catch block            e.printStackTrace();        }        return size;    }}
      
     
    
   

3、另外，可以使用系统提供的api把byte自动转成KB、MB、GB等单位

Formatter.formatFileSize(getApplicationContext(),long类型字节大小);

4、清理进程

// 清理进程ActivityManager am = (ActivityManager) getSystemService(Context.ACTIVITY_SERVICE);am.killBackgroundProcesses(bean.getPackName());需要在清单文件中添加如下权限：
   

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