Android基础--获取SD卡可用容量

import java.io.File;



import android.os.Build;

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 {



    @Override

    protected void onCreate(Bundle savedInstanceState) {

        super.onCreate(savedInstanceState);

        setContentView(R.layout.activity_main);

        

         File path = Environment.getExternalStorageDirectory();

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

         long blockSize;

         long totalBlocks;

         long availableBlocks;

         

         

         //检测系统当前版本号

         if(Build.VERSION.SDK_INT >= Build.VERSION_CODES.JELLY_BEAN_MR2){

            blockSize = stat.getBlockSizeLong();

            totalBlocks = stat.getBlockCountLong();

            availableBlocks = stat.getAvailableBlocksLong();

         }

         else{

            blockSize = stat.getBlockSize();

            totalBlocks = stat.getBlockCount();

            availableBlocks = stat.getAvailableBlocks();

         }

         

         TextView tv = (TextView) findViewById(R.id.tv);

         tv.setText(formatSize(availableBlocks * blockSize));



    }



     private String formatSize(long size) {

            return Formatter.formatFileSize(this, size);

       }



}