android_09_sd卡可用空间大小

效果:

 

 

 

 

代码:

 

 

package com.xsism.sdcardavailablesize;

import java.io.File;

import android.support.v7.app.ActionBarActivity;
import android.text.format.Formatter;
import android.os.Build;
import android.os.Bundle;
import android.os.Environment;
import android.os.StatFs;
import android.view.Menu;
import android.view.MenuItem;
import android.widget.TextView;


public class MainActivity extends ActionBarActivity {

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


    @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;
    }

    @Override
    public boolean onOptionsItemSelected(MenuItem item) {
        // Handle action bar item clicks here. The action bar will
        // automatically handle clicks on the Home/Up button, so long
        // as you specify a parent activity in AndroidManifest.xml.
        int id = item.getItemId();
        if (id == R.id.action_settings) {
            return true;
        }
        return super.onOptionsItemSelected(item);
    }
    // 获取系统可用的sd大小
    public void getAvailabilitySize(){
    	File path = Environment.getExternalStorageDirectory();
        StatFs stat = new StatFs(path.getPath());
        long blockSize;
        long totalBlocks;
        long availableBlocks;
        
        //获取当前系统版本的等级 18
        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);
    }
}