android学习笔记之——获取SD卡及手机ROM容量

          继续android学习之旅，今天通过一个小例子，来获取SD卡的容量和手机ROM的容量，具体代码如下：

package com.urovo.sdcardspace;import java.io.File;import android.os.Bundle;import android.os.Environment;import android.os.StatFs;import android.app.Activity;import android.text.format.Formatter;import android.view.Menu;import android.widget.TextView;public class MainActivity extends Activity {@Overrideprotected void onCreate(Bundle savedInstanceState) {super.onCreate(savedInstanceState);setContentView(R.layout.activity_main);TextView tv = (TextView) findViewById(R.id.tv);File path = Environment.getExternalStorageDirectory();//得到SD卡的路径    StatFs stat = new StatFs(path.getPath());//创建StatFs对象，用来获取文件系统的状态    long blockCount = stat.getBlockCount();    long blockSize = stat.getBlockSize();    long availableBlocks = stat.getAvailableBlocks();        String totalSize = Formatter.formatFileSize(getApplicationContext(), blockCount*blockSize);//格式化获得SD卡总容量    String availableSize = Formatter.formatFileSize(getApplicationContext(), blockCount*availableBlocks);//获得SD卡可用容量        tv.setText("SD卡总容量:"+totalSize+"\nSD卡可用容量:"+availableSize+"\n"+getRomSpace());}private String getRomSpace() {File path = Environment.getDataDirectory();    StatFs stat = new StatFs(path.getPath());    long blockCount = stat.getBlockCount();    long blockSize = stat.getBlockSize();    long availableBlocks = stat.getAvailableBlocks();        String totalSize = Formatter.formatFileSize(getApplicationContext(), blockCount*blockSize);    String availableSize = Formatter.formatFileSize(getApplicationContext(), blockCount*availableBlocks);    return "手机Rom总容量:"+totalSize+"\n手机Rom可用容量:"+availableSize;}}

具体的内容，可以通过分析android settings部分的源码，来加深了解。