2 知识点怎么获取sd卡的大小

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<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/size"        android:layout_width="wrap_content"        android:layout_height="wrap_content"        android:text="@string/hello_world" /></RelativeLayout>

Activity

package org.sicn.lee.getsddata;import java.io.File;import android.app.Activity;import android.os.Bundle;import android.os.Environment;import android.os.StatFs;import android.view.Menu;import android.widget.TextView;import android.widget.Toast;public class MainActivity extends Activity {private TextView size;    @Override    protected void onCreate(Bundle savedInstanceState) {        super.onCreate(savedInstanceState);        super.setContentView(R.layout.activity_main);                this.size=(TextView) super.findViewById(R.id.size);        File file=Environment.getExternalStorageDirectory();        StatFs statfs=new StatFs(file.getPath());        long blockSize=statfs.getBlockSize();        long totalBlocks=statfs.getBlockCount();        long totalBytes=blockSize*totalBlocks;        this.size.setText("SD卡大小:"+TextFormater.getDataSize(totalBytes));        Toast.makeText(this,"SD卡大小："+TextFormater.getDataSize(totalBytes),Toast.LENGTH_LONG).show();    }    @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;    }    }

格式化大小的工具类:

package org.sicn.lee.getsddata;import java.text.DecimalFormat;public class TextFormater {/** * 返回byte的数据大小对应的文本 *  * @param size * @return */public static String getDataSize(long size) {if (size < 0) {size = 0;}DecimalFormat formater = new DecimalFormat("####.00");if (size < 1024) {return size + "bytes";} else if (size < 1024 * 1024) {float kbsize = size / 1024f;return formater.format(kbsize) + "KB";} else if (size < 1024 * 1024 * 1024) {float mbsize = size / 1024f / 1024f;return formater.format(mbsize) + "MB";} else if (size < 1024 * 1024 * 1024 * 1024) {float gbsize = size / 1024f / 1024f / 1024f;return formater.format(gbsize) + "GB";} else {return "size: error";}}/** * 返回kb的数据大小对应的文本 *  * @param size * @return */public static String getKBDataSize(long size) {if (size < 0) {size = 0;}return getDataSize(size * 1024);}}

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