Android获取总内存和可用内存

本文主要是介绍Android获取总内存和可用内存，希望对大家解决编程问题提供一定的参考价值，需要的开发者们随着小编来一起学习吧！

一、原理

基于 /proc/meminfo 信息读取

/* /proc/meminfoMemTotal:        2902436 kBMemFree:          199240 kBMemAvailable:    1088764 kBBuffers:           40848 kBCached:           862908 kBSwapCached:        54696 kBActive:          1222848 kBInactive:         671468 kBActive(anon):     758516 kBInactive(anon):   242560 kBActive(file):     464332 kBInactive(file):   428908 kBUnevictable:        5972 kBMlocked:             256 kBSwapTotal:       1048572 kBSwapFree:         537124 kBDirty:                12 kBWriteback:             0 kBAnonPages:        988820 kBMapped:           508996 kBShmem:              4800 kBSlab:             157204 kBSReclaimable:      57364 kBSUnreclaim:        99840 kBKernelStack:       41376 kBPageTables:        51820 kBNFS_Unstable:          0 kBBounce:                0 kBWritebackTmp:          0 kBCommitLimit:     2499788 kBCommitted_AS:   76292324 kBVmallocTotal:   258867136 kBVmallocUsed:           0 kBVmallocChunk:          0 kBCmaTotal:              0 kBCmaFree:               0 kB*/

二、代码

package com.fadisu.cpurun.util;import java.io.BufferedReader;
import java.io.FileReader;
import java.io.IOException;
import java.util.ArrayList;
import java.util.List;
import java.util.regex.Matcher;
import java.util.regex.Pattern;public class MemInfoUtil {public static List<String> getMemInfo() {List<String> result = new ArrayList<>();try {String line;BufferedReader br = new BufferedReader(new FileReader("/proc/meminfo"));while ((line = br.readLine()) != null) {result.add(line);}br.close();} catch (IOException e) {e.printStackTrace();}return result;}/* /proc/meminfoMemTotal:        2902436 kBMemFree:          199240 kBMemAvailable:    1088764 kBBuffers:           40848 kBCached:           862908 kBSwapCached:        54696 kBActive:          1222848 kBInactive:         671468 kBActive(anon):     758516 kBInactive(anon):   242560 kBActive(file):     464332 kBInactive(file):   428908 kBUnevictable:        5972 kBMlocked:             256 kBSwapTotal:       1048572 kBSwapFree:         537124 kBDirty:                12 kBWriteback:             0 kBAnonPages:        988820 kBMapped:           508996 kBShmem:              4800 kBSlab:             157204 kBSReclaimable:      57364 kBSUnreclaim:        99840 kBKernelStack:       41376 kBPageTables:        51820 kBNFS_Unstable:          0 kBBounce:                0 kBWritebackTmp:          0 kBCommitLimit:     2499788 kBCommitted_AS:   76292324 kBVmallocTotal:   258867136 kBVmallocUsed:           0 kBVmallocChunk:          0 kBCmaTotal:              0 kBCmaFree:               0 kB*/public static String getFieldFromMeminfo(String field) throws IOException {BufferedReader br = new BufferedReader(new FileReader("/proc/meminfo"));Pattern p = Pattern.compile(field + "\\s*:\\s*(.*)");try {String line;while ((line = br.readLine()) != null) {Matcher m = p.matcher(line);if (m.matches()) {return m.group(1);}}} finally {br.close();}return null;}public static String getMemTotal() {String result = null;try {result = getFieldFromMeminfo("MemTotal");} catch (IOException e) {e.printStackTrace();}return result;}public static String getMemAvailable() {String result = null;try {result = getFieldFromMeminfo("MemAvailable");} catch (IOException e) {e.printStackTrace();}return result;}}