获取安卓内存状态

package com.itheiima28.memorydemo;

import java.io.File;

import android.app.Activity;
import android.os.Bundle;
import android.os.Environment;
import android.os.StatFs;
import android.text.format.Formatter;
import android.view.Menu;
import android.view.MenuItem;
import android.widget.TextView;

public class MainActivity extends Activity {

@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);

TextView tvMemoryInfo = (TextView) findViewById(R.id.tv_memory_info);

//获得sd卡的内存状态
File sdcardFileDir = Environment.getExternalStorageDirectory();
System.out.println(sdcardFileDir.toString());
String sdcardMemory = getMemoryInfo(sdcardFileDir);

//获得手机内部存储控件的状态
File dataFileDir = Environment.getDataDirectory();//   /data
String dataMemory = getMemoryInfo(dataFileDir);
//System.out.println(dataFileDir.toString());
tvMemoryInfo.setText("SD卡："+sdcardMemory + "\n手机内部内存："+dataMemory);
}

/**
* 根据路径获取内存的状态
* */
public String getMemoryInfo(File path){
//获得一个磁盘状态对象
//File path = Environment.getExternalStorageDirectory();

StatFs stat = new StatFs(path.getPath());
long blockSize = stat.getBlockSize();//获得一个扇区的大小
long totalBlocks = stat.getBlockCount(); //获得一个扇区的总数
long availableBlocks = stat.getAvailableBlocks();//获得可用的扇区

//总空间
String totalMemory = Formatter.formatFileSize(this, totalBlocks*blockSize);
//可用空间
String availableMemory = Formatter.formatFileSize(this, availableBlocks*blockSize);

return "总空间:" 	+ totalMemory + "\n" + "可用空间:" + availableMemory;
}
}

<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:paddingBottom="@dimen/activity_vertical_margin"
android:paddingLeft="@dimen/activity_horizontal_margin"
android:paddingRight="@dimen/activity_horizontal_margin"
android:paddingTop="@dimen/activity_vertical_margin"
tools:context="com.itheiima28.memorydemo.MainActivity" >

<TextView
android:id="@+id/tv_memory_info"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_centerInParent="true"  />

</RelativeLayout>

<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
package="com.itheiima28.memorydemo"
android:versionCode="1"
android:versionName="1.0" >

<uses-sdk
android:minSdkVersion="14"
android:targetSdkVersion="21" />

<application
android:allowBackup="true"
android:icon="@drawable/ic_launcher"
android:label="@string/app_name"
android:theme="@style/AppTheme" >
<activity
android:name=".MainActivity"
android:label="@string/app_name" >
<intent-filter>
<action android:name="android.intent.action.MAIN" />

<category android:name="android.intent.category.LAUNCHER" />
</intent-filter>
</activity>
</application>

</manifest>

<span style="white-space:pre">		</span> File path = Environment.getExternalStorageDirectory();
StatFs stat = new StatFs(path.getPath());
long blockSize = stat.getBlockSize();
long totalBlocks = stat.getBlockCount();
long availableBlocks = stat.getAvailableBlocks();

mSdSize.setSummary(formatSize(totalBlocks * blockSize));
mSdAvail.setSummary(formatSize(availableBlocks * blockSize) + readOnly);

mSdMountToggle.setEnabled(true);
mSdMountToggle.setTitle(mRes.getString(R.string.sd_eject));
mSdMountToggle.setSummary(mRes.getString(R.string.sd_eject_summary));