android获取存储卡使用情况

 package com.aib.com;

 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.util.Log;
 import android.view.Menu;
 import android.widget.TextView;

 public class MainActivity extends Activity {

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

     public void getSDcardMemory() {
         /** 获取存储卡路径 */
          File sdcardDir = Environment.getExternalStorageDirectory();
         /** 获取手机内存路径 */
     //    File Dir = Environment.getDataDirectory();
         /** StatFs 看文件系统空间使用情况 */
         StatFs statFs = new StatFs(sdcardDir.getPath());
         /** Block 的 size */
         int blockSize = statFs.getBlockSize();
         /** 总 Block 数量 */
         int totalBlocks = statFs.getBlockCount();
         /** 可用的 Block 数量 */
         int availableBlocks = statFs.getAvailableBlocks();
         /**
          * android.text.format.Formatter :Utility class to aid in formatting
          * common values that are not covered by the standard
          * java.util.Formatter.
          */
         Log.i("aib", blockSize +"---"+totalBlocks+"----"+availableBlocks);
         String totaoSize = Formatter.formatFileSize(MainActivity.this,
                 totalBlocks * blockSize);
         String availSize = Formatter.formatFileSize(MainActivity.this,
                 availableBlocks * blockSize);
         TextView tv = (TextView) findViewById(R.id.tv);
         tv.setText(sdcardDir.getPath()+ "\n总空间： "
                 + totaoSize +"\n可用空间："+ availSize);
     }

     @Override
     public boolean onCreateOptionsMenu(Menu menu) {
         // Inflate the menu; this adds items to the action bar if it is present.
         getMenuInflater().inflate(R.menu.main, menu);
         return true;
     }

 }