查看源代码查寻获取sd卡剩余容量的代码_Android

查看源代码查找获取sd卡剩余容量的代码

下载android源码，找到app下的Settings应用源码，导入Settings项目（android项目源码）

查找“可用空间”得到

 <string name="memory_available" msgid="418542433817289474">"可用空间"</string>

查找"memory_available"，得到

<Preference android:key="memory_sd_avail"     style="?android:attr/preferenceInformationStyle"     android:title="@string/memory_available"    android:summary="00"/>

查找"memorysdavail"，得到

//这个字符串就是sd卡剩余容量formatSize(availableBlocks * blockSize) + readOnly//这两个参数相乘，得到sd卡以字节为单位的剩余容量availableBlocks * blockSize

存储设备会被分为若干个区块，每个区块有固定的大小
区块大小 * 区块数量等于存储设备的总大小

示例代码

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    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);}