package xidian.dy.com.chujia;

import android.os.Build;

import android.os.Environment;

import android.os.StatFs;

import android.support.v7.app.AppCompatActivity;

import android.os.Bundle;

import android.text.format.Formatter;

import android.widget.TextView;

import java.io.File;

public class MainActivity extends AppCompatActivity {

    @Override

    protected void onCreate(Bundle savedInstanceState) {

        super.onCreate(savedInstanceState);

        setContentView(R.layout.activity_main);

        if(Environment.getExternalStorageState().equals(Environment.MEDIA_MOUNTED)){

            TextView tv1 = (TextView)findViewById(R.id.total);

            TextView tv2 = (TextView)findViewById(R.id.available);

            File f = Environment.getExternalStorageDirectory();

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

            long blockSize,totalBlocks,availableBlocks;

            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();

            }

            if(tv1 != null)

                tv1.setText("总大小:"+formatSize(blockSize*totalBlocks));

            if(tv2 != null)

                tv2.setText("剩余容量:"+formatSize(blockSize*availableBlocks));

        }

    }

    private  String formatSize(long size){

        return Formatter.formatFileSize(this, size);

    }

}