安卓USB挂载，卸载广播接收类

来源：互联网发布：同学通讯录查询软件编辑：程序博客网时间：2024/06/18 13:07

（一）说明：

接上USB，接收广播；拔掉USB，接收广播。并且可以获得USB的目录打印。方便拓展功能。

（二）步骤：

1.注册

 <receiver             android:name="com.harison.receive.USBBroadcastReceiver"             >            <intent-filter android:priority="999" >                <action android:name="android.intent.action.MEDIA_MOUNTED" >                </action>                <action android:name="android.intent.action.MEDIA_EJECT" >                </action>                <action android:name="android.intent.action.MEDIA_UNMOUNTED" >                </action>                <data android:scheme="file" >                </data>            </intent-filter>        </receiver>

2.类代码

package com.harison.receive;import java.io.File;import java.util.HashMap;import android.content.BroadcastReceiver;import android.content.Context;import android.content.Intent;import android.net.Uri;import android.os.StatFs;import android.util.Log;public class USBBroadcastReceiver extends BroadcastReceiver {    private static int count = 0;    private static HashMap<String, Integer> diskDesc = new HashMap<String, Integer>();    private static final String TAG = "USBBroadcastReceiver";    public static synchronized void addDiskDesc(String key, Integer value) {        diskDesc.put(key, value);    }    public static synchronized void removeDiskDesc(String key) {        diskDesc.remove(key);    }    public static String formatKey(String value) {        if (value == null) {            return null;        }        if (!value.startsWith("/")) {            value = "/" + value;        }        if (value.endsWith("/")) {            value = value.substring(0, value.length() - 1);            return formatKey(value);        } else {            return value;        }    }    /**     * @param source     * @return     */    public static String splitHeadAndTail(String source) {        if (source == null) {            return null;        }        if (source.startsWith("/")) {            source = source.substring(1);        }        if (source.endsWith("/")) {            source = source.substring(0, source.length() - 1);        }        return source;    }    private static synchronized void initDiskDesc() {        String parent = "/mnt/usb/";        File pFile = new File(parent);        File[] children = pFile.listFiles();        if (children != null) {            String str = null;            for (File file : children) {                str = file.getName();                if (str != null) {                    Log.e(TAG, "find disk " + str);                    addDiskDesc(parent + str, 0);                }            }        }    }    public USBBroadcastReceiver() {        Log.d(TAG, "AD ----- USBBroadcastReceiver constructor!!!");        if (count == 0) {            initDiskDesc();            count++;        }    }    /**     * @return disk count     */    public static synchronized int getDiskCount() {        if (diskDesc != null) {            return diskDesc.size();        } else {            return 0;        }    }    /**     * return disk capacity percent by path     *     * @param key     * @return     */    public static synchronized int getDiskCapacityPercent(String key) {        Integer tmp = diskDesc.get(key);        if (tmp == null) {            return -1;        } else {            return tmp;        }    }    public static synchronized boolean isDiskExisted(String path) {        path = formatKey(path);        if (diskDesc.containsKey(path)) {            return true;        } else {            return false;        }    }    @Override    public void onReceive(Context context, Intent intent) {        String action = intent.getAction();        if (action.equals(Intent.ACTION_MEDIA_MOUNTED) || action.equals(Intent.ACTION_MEDIA_EJECT)) {            Uri uri = intent.getData();            final String path = uri.getPath();            Log.w(TAG, "path:" + path);            if (action.equals(Intent.ACTION_MEDIA_MOUNTED)) {                Log.w(TAG, "AD ---- ACTION_MEDIA_MOUNTED:" + path);                addDiskDesc(path, 0);                new Thread() {                    public void run() {                        try {                            StatFs sf = new StatFs(path);                            final int percent = (int) (100 - ((sf.getFreeBlocks() * 100)/ sf.getBlockCount()));                        } catch (IllegalArgumentException e) {                            Log.e(TAG, "Error : ", e);                        }                    };                }.start();            } else if (action.equals(Intent.ACTION_MEDIA_UNMOUNTED)) {                Log.w(TAG, "AD --- ACTION_MEDIA_UNMOUNTED:" + path);            } else if (action.equals(Intent.ACTION_MEDIA_EJECT)) {                Log.w(TAG, "AD ---- ACTION_MEDIA_EJECT:" + path);                removeDiskDesc(path);            }        }    }}

(三)实验现象

06-12 13:59:06.593: D/USBBroadcastReceiver(2581): USBBroadcastReceiver constructor!!!06-12 13:59:06.593: E/USBBroadcastReceiver(2581): find disk sda1<span style="color:#ff6666;">--------------  发现usb</span>06-12 13:59:06.783: W/USBBroadcastReceiver(2581): AD ---- ACTION_MEDIA_MOUNTED:/mnt/usb/sda106-12 13:59:26.168: D/USBBroadcastReceiver(2776): USBBroadcastReceiver constructor!!!06-12 13:59:26.168: W/USBBroadcastReceiver(2776): path:/mnt/usb/sda106-12 13:59:26.168: W/USBBroadcastReceiver(2776): ACTION_MEDIA_EJECT:/mnt/usb/sda1-<span style="color:#ff0000;">--------------usb挂载成功</span>06-12 13:59:26.188: D/USBBroadcastReceiver(2581): USBBroadcastReceiver constructor!!!06-12 13:59:26.188: W/USBBroadcastReceiver(2581): path:/mnt/usb/sda106-12 13:59:26.188: W/USBBroadcastReceiver(2581): AD ---- ACTION_MEDIA_EJECT:/mnt/usb/sda1  <span style="color:#ff0000;">------------ usb卸载成功</span>

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