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  • 保存文件到SD卡以及分析setting源代码获取SD卡大小

    保存文件到SD卡

    public static boolean saveInfo(Context context, String username,

    String password) {

    try {

    if ( Environment.MEDIA_MOUNTED.equals( Environment

    .getExternalStorageState())) {

    File file = new File( Environment.getExternalStorageDirectory(), "info.txt");

    FileOutputStream fos = new FileOutputStream(file);

    fos.write((username + "=" + password).getBytes());

    fos.flush();

    fos.close();

    return true;

    } else {

    Toast.makeText(context, "cdcard被卸载", 0).show();

    return false;

    }

    } catch (Exception e) {

    e.printStackTrace();

    return false;

    }

    }

    public static HashMap<String, String> getInfo(Context context) {

    File file = new File(Environment.getExternalStorageDirectory(), "info.txt");

    try {

    FileInputStream fis = new FileInputStream(file);

    BufferedReader br = new BufferedReader(new InputStreamReader(fis));

    String[] result = br.readLine().split("=");

    HashMap<String, String> map = new HashMap<String, String>();

    map.put("username", result[0]);

    map.put("password", result[1]);

    br.close();

    return map;

    } catch (Exception e) {

    Toast.makeText(context, "无法读取用户信息", 0).show();

    }

    return null;

    }

    授权

     <uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE"/>

    分析setting源代码获取SD卡大小

    public String getSdcardInfo() {

    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 = blockSize * availableBlocks;

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

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

    return "cdcard总内存:" + totalStr + "\n" + "可用内存:" + availStr;

    }

    public String getROMInfo() {

    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 = blockSize * availableBlocks;

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

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

    return "手机总内存:" + totalStr + "\n" + "可用内存:" + availStr;

    }

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  • 原文地址:https://www.cnblogs.com/freenovo/p/4469839.html
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