<?xml version="1.0" encoding="utf-8"?>

<manifest xmlns:android="http://schemas.android.com/apk/res/android"

??? package="com.itheima28.memorydemo"

??? android:versionCode="1"

??? android:versionName="1.0" >

?

??? <uses-sdk

??????? android:minSdkVersion="8"

??????? android:targetSdkVersion="19" />

?????????????

??? <application

??????? android:allowBackup="true"

??????? android:icon="@drawable/ic_launcher"

??????? android:label="@string/app_name"

??????? android:theme="@style/AppTheme" >

??????? <activity

??????????? android:name="com.itheima28.memorydemo.MainActivity"

??????????? android:label="@string/app_name" >

??????????? <intent-filter>

??????????????? <action android:name="android.intent.action.MAIN" />

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??????????????? <category android:name="android.intent.category.LAUNCHER" />

??????????? </intent-filter>

??????? </activity>

??? </application>

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</manifest>

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<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.itheima28.memorydemo.MainActivity$PlaceholderFragment" >

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??? <TextView

? ??????android:id="@+id/tv_memory_info"

??????? android:layout_width="wrap_content"

??????? android:layout_height="wrap_content"

??????? android:layout_centerInParent="true"/>

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</RelativeLayout>

package com.itheima28.memorydemo;

?

import java.io.File;

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import android.os.Bundle;

import android.os.Environment;

import android.os.StatFs;

import android.support.v7.app.ActionBarActivity;

import android.text.format.Formatter;

import android.widget.TextView;

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public class MainActivity extends ActionBarActivity {

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??? @Override

??? protected void onCreate(Bundle savedInstanceState) {

?????? super.onCreate(savedInstanceState);

?????? setContentView(R.layout.activity_main);

??????

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

??????

?????? //獲得sd卡的內(nèi)存狀態(tài)

?????? File sdcardFileDir = Environment.getExternalStorageDirectory();

?????? String sdcardMemory = getMemoryInfo(sdcardFileDir);

???

?????? //獲得手機內(nèi)部存儲控件的狀態(tài)

?????? File dataFileDir = Environment.getDataDirectory();

?????? String dataMemory = getMemoryInfo(dataFileDir);

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?????? tvMemoryInfo.setText("SD卡: " + sdcardMemory + "\n手機內(nèi)部: " + dataMemory);

??? }

???

??? /**

??? ?* 根據(jù)路徑獲取內(nèi)存狀態(tài)

??? ?* @param path

??? ?* @return

??? ?*/

??? @SuppressWarnings("deprecation")

??? private String getMemoryInfo(File path) {

?????? //獲得一個磁盤狀態(tài)對象

?????? StatFs stat = new StatFs(path.getPath());

??????

?????? //獲得一個扇區(qū)的大小

?????? long blockSize = stat.getBlockSize();

???

?????? //獲得扇區(qū)的總數(shù)

??? ??? long totalBlocks = stat.getBlockCount();

??? ???

??? ??? //獲得可用的扇區(qū)數(shù)量

??? ??? long availableBlocks = stat.getAvailableBlocks();

???

??? ??? //總空間

??? ??? String totalMemory =? Formatter.formatFileSize(this, totalBlocks * blockSize);

??? ???

??? ??? //可用空間

??? ??? String availableMemory = Formatter.formatFileSize(this, availableBlocks * blockSize);

??? ???

??? ??? return "總空間：" + totalMemory + "\n可用空間：" + availableMemory;

??? }

}