Android格式化外部设备如USB等

最主要的方法

/**
     * @Description 格式化
     * @param path 路径
     * @return true success ;false failure
     */
    public boolean formatMedia(final String path) {
        IMountService mountService =  getMountService();
        int result = 0;
        try {
            //当卸载完sdcard后才能格式化sdcard - sdcard can be formatted only after the sdcard is unloaded
            mountService.unmountVolume(path, true, false);
            //给sdcard卸载的时间不能超过5s，超过5s后iMountService.formatVolume()不起作用。
            Thread.sleep(4 * 1000);
            result = mountService.formatVolume(path); //这步就是格式化
            Log.d(TAG, "---------volume's path is " + path + "------format success ? " + result);
            if (result == 0) { //如果成功卸载
                Thread.sleep(4 * 1000);
                int resultMount = mountService.mountVolume(path); //挂载回去
                Log.d(TAG, "---------result_mount " + resultMount); //挂载结果
            }
        } catch (Exception ex) {
            ex.printStackTrace();
        }
        if (result != 0) {
            return true;
        }
        return false;
    }

    /**
     * @Description 得到IMountService
     * @return IMountService
     */
    public synchronized IMountService getMountService() {
        if (mMountService == null) {
            IBinder iBinder = ServiceManager.getService("mount");
            if (iBinder != null) {
                 mMountService = IMountService.Stub.asInterface(iBinder);
                if (mMountService == null) {
                    Log.e(TAG, "Unable to connect to mount service! - is it running yet?");
                }
            }
        }
        return mMountService;
     }

注意import

import android.os.IBinder;
import android.os.storage.IMountService;
import android.os.ServiceManager;

如果是要格式化所有设备，则可以用固有方法

StorageVolume[] volumes = mountService.getVolumeList();

获取储存信息，再用每一个

volume.getPath();

获得所有路径。

/**
     * @Description format all the device
     */
    public void formatMediaAll() {
        IMountService mountService =  getMountService();
        try {
            StorageVolume[] volumes = mountService.getVolumeList();
            for (StorageVolume volume : volumes) {
                formatMedia(volume.getPath());
            }
        } catch (Exception e) {
            e.printStackTrace();
        }
    }

注意import

import android.os.storage.StorageVolume;

上述代码验证有效，但是注意只能在源码中编译，直接在eclipse中写会报错，无法编译通过。

如何在源码编译

前提条件：服务器有源码可编译

CRT命令：
    快速压缩：tar xvzf 压缩包名
    快速删除：rm
    快速重命名：mv 文件名.后缀 新文件名.后缀

首先要编译一下SDK（第一次需要，以后不需要）

1.进入源码目录

cd xxxxxxxxxxx/

2.整体编译SDK

source autocompile.sh

然后编译APP

1.从SecureCRT登陆服务器后,先切换到源码目录

cd xxxxxxxxxxx/

2.配置环境

source build/envsetup.sh

lunch XXXXXX-eng

注：以上步骤每次登陆编译机器，切换shell后，都需要执行上述操作配置环境变量

3.切换到项目文件夹，项目需包含配置好相关信息的Android.mk，并去掉bin包和gen包等无用信息，否则编译不通过

cd packages/apps/MyProjectName/

4.运行

mm

5.去输出文件夹找到apk

../out/target/product/XXXDevice/system/app/MyProject.apk

附件：完整代码VolumeManager.java

/******************************************************************
 *
 *    @author:     AZZ
 *
 *    @version:    1.0.0
 *
 *    Create at:   2015年6月8日 下午4:45:22
 *
 *    Revision:
 *
 *    2015年6月8日 下午4:45:22
 *        - first revision
 *
 *****************************************************************/

import android.content.Context;
import android.os.IBinder;
import android.os.storage.IMountService;
import android.os.ServiceManager;
import android.os.storage.StorageManager;
import android.os.storage.StorageVolume;
import android.os.storage.StorageEventListener;
import android.util.Log;

/**
 * @ClassName VolumeManager
 * @Description 管理格式化的类
 * @author AZZ
 * @Date 2015年6月8日 下午4:45:22
 * @version 1.0.0
 */
public final class VolumeManager {
    /**
     * @Field @TAG : TAG
     */
    public static final String TAG = VolumeManager.class.getSimpleName();
    /**
     * @Field @mMountService : mMountService
     */
    private IMountService mMountService;
    /**
     * @Field @unloadedDuration : unloaded device duration
     */
    private final int unloadedDuration = 4 * 1000;
    /**
     * @Field @mStorageManager : 存储管理者
     */
    private StorageManager mStorageManager;
    /**
     * @Field @mStorageListener : 监听存储状态改变事件
     */
    private StorageEventListener mStorageListener = new StorageEventListener() {
        @Override
        public void onStorageStateChanged(final String path, final String oldState, final String newState) {
            Log.i(TAG, "Received storage state changed notification that \""
                    + path + "\" changed state from [" + oldState + "] to [" + newState + "]");
        }
    };
    /**
     * @Description init
     * @param context context
     */
    public VolumeManager(final Context context) {
        mStorageManager = (StorageManager) context.getSystemService(Context.STORAGE_SERVICE);
        mStorageManager.registerListener(mStorageListener);
    }
    /**
     * @Description 格式化
     * @param path 路径
     * @return true success ;false failure
     */
    public boolean formatMedia(final String path) {
        IMountService mountService =  getMountService();
        int result = 0;
        try {
            //当卸载完sdcard后才能格式化sdcard - sdcard can be formatted only after the sdcard is unloaded
            mountService.unmountVolume(path, true, false);
            //给sdcard卸载的时间不能超过5s，超过5s后iMountService.formatVolume()不起作用。
            Thread.sleep(unloadedDuration);
            result = mountService.formatVolume(path);
            Log.d(TAG, "---------volume's path is " + path + "------format success ? " + result);
            if (result == 0) {
                Thread.sleep(unloadedDuration);
                int resultMount = mountService.mountVolume(path); //挂载回去
                Log.d(TAG, "---------result_mount " + resultMount);
            }
        } catch (Exception ex) {
            ex.printStackTrace();
        }
        if (result != 0) {
            return true;
        }
        return false;
    }
    /**
     * @Description format all the device
     */
    public void formatMediaAll() {
        IMountService mountService =  getMountService();
        try {
            StorageVolume[] volumes = mountService.getVolumeList();
            for (StorageVolume volume : volumes) {
                boolean result = formatMedia(volume.getPath());
            }
        } catch (Exception e) {
            e.printStackTrace();
        }
    }
    /**
     * @Description 得到IMountService
     * @return IMountService
     */
    public synchronized IMountService getMountService() {
        if (mMountService == null) {
            IBinder iBinder = ServiceManager.getService("mount");
            if (iBinder != null) {
                 mMountService = IMountService.Stub.asInterface(iBinder);
                if (mMountService == null) {
                    Log.e(TAG, "Unable to connect to mount service! - is it running yet?");
                }
            }
        }
        return mMountService;
     }
    /**
     * @Description 销毁方法
     */
    public void destroy() {
        if (mStorageManager != null) {
            mStorageManager.unregisterListener(mStorageListener);
        }
    }
}