Android_02_擷取SD卡的可用容量

Android_02_擷取SD卡的可用容量

程式碼範例如下：

 

package com.itheima.getsdavail;import java.io.File;import android.os.Build;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 {@SuppressWarnings(deprecation)@Overrideprotected void onCreate(Bundle savedInstanceState) {super.onCreate(savedInstanceState);setContentView(R.layout.activity_main);File path = Environment.getExternalStorageDirectory();        StatFs stat = new StatFs(path.getPath());        long blockSize;        long totalBlocks;        long availableBlocks;                //擷取當前系統版本的等級        if(Build.VERSION.SDK_INT >= Build.VERSION_CODES.JELLY_BEAN_MR2){

//高版本的Android支援以下操作         blockSize = stat.getBlockSizeLong();             totalBlocks = stat.getBlockCountLong();             availableBlocks = stat.getAvailableBlocksLong();        }

//低版本的Android支援以下操作        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);    }}

 

 

註：可以通過源碼的Setting應用去查看其是如何擷取SD卡的剩餘空間的，從而通過借鑒到達我們擷取SD卡剩餘容量的目的