Android 如何获取手机总内存和可用内存等信息

<?xml version="1.0" encoding="utf-8"?> <LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"   android:orientation="vertical"   android:layout_width="fill_parent"   android:layout_height="fill_parent" > <TextView    android:layout_width="fill_parent"    android:layout_height="wrap_content"    android:textStyle="bold"   android:id="@+id/system_memory" /> </LinearLayout> 

package com.figo.readsyememory;  import android.app.Activity; import android.os.Bundle; import java.io.BufferedReader; import java.io.FileReader; import java.io.IOException; import android.app.ActivityManager; import android.app.ActivityManager.MemoryInfo; import android.content.Context; import android.text.format.Formatter; import android.util.Log; import android.widget.TextView;  public class ReadSystemMemory extends Activity {    TextView tv = null;    private String getAvailMemory() {// 获取android当前可用内存大小      ActivityManager am = (ActivityManager) getSystemService(Context.ACTIVITY_SERVICE);     MemoryInfo mi = new MemoryInfo();     am.getMemoryInfo(mi);     //mi.availMem; 当前系统的可用内存      return Formatter.formatFileSize(getBaseContext(), mi.availMem);// 将获取的内存大小规格化   }    private String getTotalMemory() {     String str1 = "/proc/meminfo";// 系统内存信息文件     String str2;     String[] arrayOfString;     long initial_memory = 0;      try {       FileReader localFileReader = new FileReader(str1);       BufferedReader localBufferedReader = new BufferedReader(           localFileReader, 8192);       str2 = localBufferedReader.readLine();// 读取meminfo第一行，系统总内存大小        arrayOfString = str2.split("//s+");       for (String num : arrayOfString) {         Log.i(str2, num + "/t");       }        initial_memory = Integer.valueOf(arrayOfString[1]).intValue() * 1024;// 获得系统总内存，单位是KB，乘以1024转换为Byte       localBufferedReader.close();      } catch (IOException e) {     }     return Formatter.formatFileSize(getBaseContext(), initial_memory);// Byte转换为KB或者MB，内存大小规格化   }    /** Called when the activity is first created. */   @Override   public void onCreate(Bundle savedInstanceState) {     super.onCreate(savedInstanceState);     setContentView(R.layout.main);      tv = (TextView) findViewById(R.id.system_memory);     tv.setText("手机总内存: " + this.getTotalMemory() + ", " + "可用内存: "         + this.getAvailMemory());   } } 

public class GetFreeMem extends Activity {   /** Called when the activity is first created. */   @Override   public void onCreate(Bundle savedInstanceState) {     super.onCreate(savedInstanceState);     setContentView(R.layout.main);     Method _readProclines = null;     try {       Class procClass;       procClass = Class.forName("android.os.Process");       Class parameterTypes[]= new Class[] {String.class, String[].class, long[].class };       _readProclines = procClass.getMethod("readProcLines", parameterTypes);       Object arglist[] = new Object[3];       final String[] mMemInfoFields = new String[] {"MemTotal:",           "MemFree:", "Buffers:", "Cached:"};       long[] mMemInfoSizes = new long[mMemInfoFields.length];       mMemInfoSizes[0] = 30;       mMemInfoSizes[1] = -30;       arglist[0] = new String("/proc/meminfo");       arglist[1] = mMemInfoFields;       arglist[2] = mMemInfoSizes;       if(_readProclines!=null){         _readProclines.invoke(null, arglist);         for (int i=0; i<mMemInfoSizes.length; i++) {           Log.d("GetFreeMem", mMemInfoFields[i]+" : "+mMemInfoSizes[i]/1024);         }       }     } catch (ClassNotFoundException e) {       e.printStackTrace();     } catch (SecurityException e) {       e.printStackTrace();     } catch (IllegalArgumentException e) {       e.printStackTrace();     } catch (IllegalAccessException e) {       e.printStackTrace();     } catch (InvocationTargetException e) {       e.printStackTrace();     } catch (NoSuchMethodException e) {       e.printStackTrace();     }   } }