获取sdcard和内存的存储空间

 package com.example.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 {

     @Override
     protected void onCreate(Bundle savedInstanceState) {
         super.onCreate(savedInstanceState);
         setContentView(R.layout.activity_main);
         TextView tv = (TextView)findViewById(R.id.tv);

         File path = Environment.getExternalStorageDirectory();
         StatFs stat = new StatFs(path.getPath());
         long blockSize = stat.getBlockSize();
         long totalBlocks = stat.getBlockCount();
         long availblocks = stat.getAvailableBlocks();
         long totalSize = blockSize * totalBlocks;
         long availSize = blockSize * availblocks;
         String totalStr = Formatter.formatFileSize(this, totalSize);
         String availStr = Formatter.formatFileSize(this, availSize);

         tv.setText("总空间为: " + totalStr + "\n可用空间为: " + availStr + "\n" + getMonmery());

     }

     public String getMonmery()
     {
         File path = Environment.getDataDirectory();
         StatFs stat = new StatFs(path.getPath());
         long blockSize = stat.getBlockSize();
         long totalBlocks = stat.getBlockCount();
         long availblocks = stat.getAvailableBlocks();
         long totalSize = blockSize * totalBlocks;
         long availSize = blockSize * availblocks;
         String totalStr = Formatter.formatFileSize(this, totalSize);
         String availStr = Formatter.formatFileSize(this, availSize);
         return "内存块的总容量为: " + totalStr + "\n可用空间为: " + availStr;
     }

 }