设置-存储-总容量修改

项目/frameworks/base/core/java/android/os/StatFs.java

/* * Copyright (C) 2007 The Android Open Source Project * * Licensed under the Apache License, Version 2.0 (the "License"); * you may not use this file except in compliance with the License. * You may obtain a copy of the License at * *      http://www.apache.org/licenses/LICENSE-2.0 * * Unless required by applicable law or agreed to in writing, software * distributed under the License is distributed on an "AS IS" BASIS, * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. * See the License for the specific language governing permissions and * limitations under the License. */package android.os;import android.system.ErrnoException;import android.system.Os;import android.system.StructStatVfs;/** * Retrieve overall information about the space on a filesystem. This is a * wrapper for Unix statvfs(). */public class StatFs {    private StructStatVfs mStat;    /**     * Construct a new StatFs for looking at the stats of the filesystem at     * {@code path}. Upon construction, the stat of the file system will be     * performed, and the values retrieved available from the methods on this     * class.     *     * @param path path in the desired file system to stat.     */    public StatFs(String path) {        mStat = doStat(path);    }    private static StructStatVfs doStat(String path) {        try {            return Os.statvfs(path);        } catch (ErrnoException e) {            throw new IllegalArgumentException("Invalid path: " + path, e);        }    }    /**     * Perform a restat of the file system referenced by this object. This is     * the same as re-constructing the object with the same file system path,     * and the new stat values are available upon return.     */    public void restat(String path) {        mStat = doStat(path);    }    /**     * @deprecated Use {@link #getBlockSizeLong()} instead.     */    @Deprecated    public int getBlockSize() {        return (int) mStat.f_bsize;    }    /**     * The size, in bytes, of a block on the file system. This corresponds to     * the Unix {@code statvfs.f_bsize} field.     */    public long getBlockSizeLong() {        return mStat.f_bsize*2;    }    /**     * @deprecated Use {@link #getBlockCountLong()} instead.     */    @Deprecated    public int getBlockCount() {        return (int) (mStat.f_blocks * 2);    }    /**     * The total number of blocks on the file system. This corresponds to the     * Unix {@code statvfs.f_blocks} field.     */    public long getBlockCountLong() {        return mStat.f_blocks*2;    }    /**     * @deprecated Use {@link #getFreeBlocksLong()} instead.     */    @Deprecated    public int getFreeBlocks() {        return (int) mStat.f_bfree*2;    }    /**     * The total number of blocks that are free on the file system, including     * reserved blocks (that are not available to normal applications). This     * corresponds to the Unix {@code statvfs.f_bfree} field. Most applications     * will want to use {@link #getAvailableBlocks()} instead.     */    public long getFreeBlocksLong() {        return mStat.f_bfree*2;    }    /**     * The number of bytes that are free on the file system, including reserved     * blocks (that are not available to normal applications). Most applications     * will want to use {@link #getAvailableBytes()} instead.     */    public long getFreeBytes() {        return mStat.f_bfree * mStat.f_bsize;    }    /**     * @deprecated Use {@link #getAvailableBlocksLong()} instead.     */    @Deprecated    public int getAvailableBlocks() {        return (int) (mStat.f_bavail * 1.5);    }    /**     * The number of blocks that are free on the file system and available to     * applications. This corresponds to the Unix {@code statvfs.f_bavail} field.     */    public long getAvailableBlocksLong() {        return mStat.f_bavail;    }    /**     * The number of bytes that are free on the file system and available to     * applications.     */    public long getAvailableBytes() {        return mStat.f_bavail * mStat.f_bsize*2;    }    /**     * The total number of bytes supported by the file system.     */    public long getTotalBytes() {        return mStat.f_blocks * mStat.f_bsize*2;    }}

*2的有出效果