Android内存使用情况的应用实例

实现效果图：

创建项目

Android清单文件

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

布局文件

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

查询内存的代码

package com.itheima28.memorydemo; import Java.io.File; 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; public class MainActivity extends ActionBarActivity { @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(); String sdcardMemory = getMemoryInfo(sdcardFileDir); //获得手机内部存储控件的状态 File dataFileDir = Environment.getDataDirectory(); String dataMemory = getMemoryInfo(dataFileDir); tvMemoryInfo.setText("SD卡: " + sdcardMemory + "\n手机内部: " + dataMemory); } /** * 根据路径获取内存状态 * @param path * @return */ @SuppressWarnings("deprecation") private String getMemoryInfo(File path) { //获得一个磁盘状态对象 StatFs stat = new StatFs(path.getPath()); //获得一个扇区的大小 long blockSize = stat.getBlockSize(); //获得扇区的总数 long totalBlocks = stat.getBlockCount(); //获得可用的扇区数量 long availableBlocks = stat.getAvailableBlocks(); //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; }}

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