Android获得手机内存和SD卡空间大小

<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:paddingBottom="@dimen/activity_vertical_margin"
android:paddingLeft="@dimen/activity_horizontal_margin"
android:paddingRight="@dimen/activity_horizontal_margin"
android:paddingTop="@dimen/activity_vertical_margin"
tools:context=".MainActivity" >

<TextView
android:id="@+id/tv"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignParentTop="true"
android:layout_centerHorizontal="true"
android:layout_marginTop="135dp"
android:text="@string/hello_world" />

</RelativeLayout>

package com.demo.getsdspace;

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 availableBlocks = stat.getAvailableBlocks();

long totalSize = blockSize * totalBlocks;
long availSize = availableBlocks * blockSize;

String totalStr = Formatter.formatFileSize(this, totalSize);
String availStr = Formatter.formatFileSize(this, availSize);

tv.setText("SD卡总空间:" + totalStr + "\n" + "SD可用空间:" + availStr + "\n" + getRomSpaceInfo());

}
public String getRomSpaceInfo(){
File path = Environment.getDataDirectory();
StatFs stat = new StatFs(path.getPath());
long blockSize = stat.getBlockSize();
long totalBlocks = stat.getBlockCount();
long availableBlocks = stat.getAvailableBlocks();

long totalSize = blockSize * totalBlocks;
long availSize = availableBlocks * blockSize;

String totalStr = Formatter.formatFileSize(this, totalSize);
String availStr = Formatter.formatFileSize(this, availSize);

return "手机内存：总空间" + totalStr + "\n手机内存：可用空间" + availStr;
}

}