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()+ "
总空间： "
                + totaoSize +"
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;
    }

}