- 微信
- 微博
  
  分享文章到微博
- 复制链接
  
  复制链接到剪贴板

Android 通过广播监听USB连接状态的改变

福州司马懿发表于 2021/11/19 04:57:09 2021/11/19

【摘要】一、原理讲解       Android通过广播监听USB连接状态的改变的动作在UsbManager.java文件里，为ACTION_USB_...

一、原理讲解

Android通过广播监听USB连接状态的改变的动作在UsbManager.java文件里，为ACTION_USB_STATE。然而在UsbManager中，该常量的注释中包含{@hide}，该注释是控制该API是否开放用的。未开发的API意味着google可以随时调整该API的定义或实现方式，而不用保证向下兼容。

所以尽量避免调用未开发的API，因为一旦系统升级导致其实现方式改变，程序很有可能就直接崩溃了。

注意：

目前仍未发现 ACTION_USB_ACCESSORY_XXX 这种广播
插拔手机与电脑之间的USB线：ACTION_USB_STATE（主要参数是 Boolean connected）
插拔U盘发送的是OTG广播：ACTION_USB_DEVICE_XXX，XXX代表了ATTACH 或 DETACH，这种情况是手机是主，u盘是从，手机给U盘供电。

二、代码如下

1、MyUsbManager.java

package com.example.testapp;

public class MyUsbManager {

	/**
	 * Broadcast Action: A sticky broadcast for USB state change events when in device mode.
	 * This is a sticky broadcast for clients that includes USB connected/disconnected state,
	 * <ul>
	 * <li> {@link #USB_CONNECTED} boolean indicating whether USB is connected or disconnected.
	 * <li> {@link #USB_CONFIGURED} boolean indicating whether USB is configured. currently zero if not configured, one for configured.
	 * <li> {@link #USB_FUNCTION_ADB} boolean extra indicating whether the adb function is enabled
	 * <li> {@link #USB_FUNCTION_RNDIS} boolean extra indicating whether the RNDIS ethernet function is enabled
	 * <li> {@link #USB_FUNCTION_MTP} boolean extra indicating whether the MTP function is enabled
	 * <li> {@link #USB_FUNCTION_PTP} boolean extra indicating whether the PTP function is enabled
	 * <li> {@link #USB_FUNCTION_PTP} boolean extra indicating whether the accessory function is enabled
	 * <li> {@link #USB_FUNCTION_AUDIO_SOURCE} boolean extra indicating whether the audio source function is enabled
	 * <li> {@link #USB_FUNCTION_MIDI} boolean extra indicating whether the MIDI function is enabled
	 * </ul>
	 */

	public static final String ACTION_USB_STATE = "android.hardware.usb.action.USB_STATE";
	
	/**
	 * Boolean extra indicating whether USB is connected or disconnected.
	 * Used in extras for the {@link #ACTION_USB_STATE} broadcast.
	 */
	public static final String USB_CONNECTED = "connected";

	/**
	 * Boolean extra indicating whether USB is configured.
	 * Used in extras for the {@link #ACTION_USB_STATE} broadcast.
	 */
	public static final String USB_CONFIGURED = "configured";

	/**
	 * Boolean extra indicating whether confidential user data, such as photos, should be
	 * made available on the USB connection. This variable will only be set when the user
	 * has explicitly asked for this data to be unlocked.
	 * Used in extras for the {@link #ACTION_USB_STATE} broadcast.
	 */
	public static final String USB_DATA_UNLOCKED = "unlocked";

	/**
	 * A placeholder indicating that no USB function is being specified.
	 * Used to distinguish between selecting no function vs. the default function in {@link #setCurrentFunction(String)}.
	 */
	public static final String USB_FUNCTION_NONE = "none";

	/**
	 * Name of the adb USB function.
	 * Used in extras for the {@link #ACTION_USB_STATE} broadcast
	 */
	public static final String USB_FUNCTION_ADB = "adb";

	/**
	 * Name of the RNDIS ethernet USB function.
	 * Used in extras for the {@link #ACTION_USB_STATE} broadcast
	 */
	public static final String USB_FUNCTION_RNDIS = "rndis";

	/**
	 * Name of the MTP USB function.
	 * Used in extras for the {@link #ACTION_USB_STATE} broadcast
	 */
	public static final String USB_FUNCTION_MTP = "mtp";

	/**
	 * Name of the PTP USB function.
	 * Used in extras for the {@link #ACTION_USB_STATE} broadcast
	 */
	public static final String USB_FUNCTION_PTP = "ptp";

	/**
	 * Name of the audio source USB function.
	 * Used in extras for the {@link #ACTION_USB_STATE} broadcast
	 */
	public static final String USB_FUNCTION_AUDIO_SOURCE = "audio_source";

	/**
	 * Name of the MIDI USB function.
	 * Used in extras for the {@link #ACTION_USB_STATE} broadcast
	 */
	public static final String USB_FUNCTION_MIDI = "midi";
}

  
 
  1
  2
  3
  4
  5
  6
  7
  8
  9
  10
  11
  12
  13
  14
  15
  16
  17
  18
  19
  20
  21
  22
  23
  24
  25
  26
  27
  28
  29
  30
  31
  32
  33
  34
  35
  36
  37
  38
  39
  40
  41
  42
  43
  44
  45
  46
  47
  48
  49
  50
  51
  52
  53
  54
  55
  56
  57
  58
  59
  60
  61
  62
  63
  64
  65
  66
  67
  68
  69
  70
  71
  72
  73
  74
  75
  76
  77
  78
  79
  80
  81
  82
  83
  84

2、UsbActivity.java

package com.example.testapp;

import android.app.Activity;
import android.content.BroadcastReceiver;
import android.content.Context;
import android.content.Intent;
import android.content.IntentFilter;
import android.content.pm.PackageManager;
import android.hardware.usb.UsbAccessory;
import android.hardware.usb.UsbDevice;
import android.hardware.usb.UsbManager;
import android.os.Bundle;
import android.widget.LinearLayout;
import android.widget.ScrollView;
import android.widget.TextView;

public class UsbActivity extends Activity {
	
	private TextView textView;
	private UsbManager usbManager;
	private BroadcastReceiver receiver;
	private IntentFilter intentFilter;
	
	@Override
	protected void onCreate(Bundle savedInstanceState) {
		super.onCreate(savedInstanceState);
		ScrollView scrollView = new ScrollView(this);
		LinearLayout linearLayout = new LinearLayout(this);
		linearLayout.setOrientation(LinearLayout.VERTICAL);
		textView = new TextView(this);
		scrollView.addView(linearLayout);
		linearLayout.addView(textView);
		
		setContentView(scrollView);
		
		usbManager = (UsbManager) getSystemService(Context.USB_SERVICE);
		receiver = new BroadcastReceiver() {
			@Override
			public void onReceive(Context context, Intent intent) {
				String action = intent.getAction();
				addText("action : " + action);
				
				if(intent.hasExtra(UsbManager.EXTRA_PERMISSION_GRANTED)) {
					boolean permissionGranted = intent.getBooleanExtra(UsbManager.EXTRA_PERMISSION_GRANTED, false);
					addText("permissionGranted : " + permissionGranted);
				}
				switch(action) {
				case UsbManager.ACTION_USB_ACCESSORY_ATTACHED:
				case UsbManager.ACTION_USB_ACCESSORY_DETACHED:
					//Name of extra for ACTION_USB_ACCESSORY_ATTACHED and ACTION_USB_ACCESSORY_DETACHED broadcasts containing the UsbAccessory object for the accessory.
					UsbAccessory accessory = intent.getParcelableExtra(UsbManager.EXTRA_ACCESSORY);
					addText(accessory.toString());
					break;
				case UsbManager.ACTION_USB_DEVICE_ATTACHED:
				case UsbManager.ACTION_USB_DEVICE_DETACHED:
					//Name of extra for ACTION_USB_DEVICE_ATTACHED and ACTION_USB_DEVICE_DETACHED broadcasts containing the UsbDevice object for the device.
					UsbDevice device = intent.getParcelableExtra(UsbManager.EXTRA_DEVICE);
					addText(device.toString());
					break;
				case MyUsbManager.ACTION_USB_STATE:
					/*
				     * <li> {@link #USB_CONNECTED} boolean indicating whether USB is connected or disconnected.
				     * <li> {@link #USB_CONFIGURED} boolean indicating whether USB is configured.
				     * currently zero if not configured, one for configured.
				     * <li> {@link #USB_FUNCTION_ADB} boolean extra indicating whether the
				     * adb function is enabled
				     * <li> {@link #USB_FUNCTION_RNDIS} boolean extra indicating whether the
				     * RNDIS ethernet function is enabled
				     * <li> {@link #USB_FUNCTION_MTP} boolean extra indicating whether the
				     * MTP function is enabled
				     * <li> {@link #USB_FUNCTION_PTP} boolean extra indicating whether the
				     * PTP function is enabled
				     * <li> {@link #USB_FUNCTION_PTP} boolean extra indicating whether the
				     * accessory function is enabled
				     * <li> {@link #USB_FUNCTION_AUDIO_SOURCE} boolean extra indicating whether the
				     * audio source function is enabled
				     * <li> {@link #USB_FUNCTION_MIDI} boolean extra indicating whether the
				     * MIDI function is enabled
				     * </ul>
				     */
					boolean connected = intent.getBooleanExtra(MyUsbManager.USB_CONNECTED, false);
					addText("connected : " + connected);
					boolean configured = intent.getBooleanExtra(MyUsbManager.USB_CONFIGURED, false);
					addText("configured : " + configured);
					boolean function_adb = intent.getBooleanExtra(MyUsbManager.USB_FUNCTION_ADB, false);
					addText("function_adb : " + function_adb);
					boolean function_rndis = intent.getBooleanExtra(MyUsbManager.USB_FUNCTION_RNDIS, false);
					addText("function_rndis : " + function_rndis);
					boolean function_mtp = intent.getBooleanExtra(MyUsbManager.USB_FUNCTION_MTP, false);
					addText("function_mtp : " + function_mtp);
					boolean function_ptp = intent.getBooleanExtra(MyUsbManager.USB_FUNCTION_PTP, false);
					addText("usb_function_ptp : " + function_ptp);
					boolean function_audio_source = intent.getBooleanExtra(MyUsbManager.USB_FUNCTION_AUDIO_SOURCE, false);
					addText("function_audio_source : " + function_audio_source);
					boolean function_midi = intent.getBooleanExtra(MyUsbManager.USB_FUNCTION_MIDI, false);
					addText("function_midi : " + function_midi);
					break;
				}
			}
		};
		intentFilter = new IntentFilter();
		intentFilter.addAction(UsbManager.ACTION_USB_ACCESSORY_ATTACHED);
		intentFilter.addAction(UsbManager.ACTION_USB_ACCESSORY_DETACHED);
		intentFilter.addAction(UsbManager.ACTION_USB_DEVICE_ATTACHED);
		intentFilter.addAction(UsbManager.ACTION_USB_DEVICE_DETACHED);
		intentFilter.addAction(MyUsbManager.ACTION_USB_STATE);
		registerReceiver(receiver, intentFilter);
		
		boolean hasUsbHost = getPackageManager().hasSystemFeature(PackageManager.FEATURE_USB_HOST);
		boolean hasUsbAccessory = getPackageManager().hasSystemFeature(PackageManager.FEATURE_USB_ACCESSORY);
		addText("hasUsbHost : " + hasUsbHost);
		addText("hasUsbAccessory : " + hasUsbAccessory);
	}
	
	@Override
	protected void onDestroy() {
		unregisterReceiver(receiver);
		super.onDestroy();
	}
	
	private void addText(String str) {
		textView.setText(textView.getText().toString() + str + "\n");
	}
}

  
 
  1
  2
  3
  4
  5
  6
  7
  8
  9
  10
  11
  12
  13
  14
  15
  16
  17
  18
  19
  20
  21
  22
  23
  24
  25
  26
  27
  28
  29
  30
  31
  32
  33
  34
  35
  36
  37
  38
  39
  40
  41
  42
  43
  44
  45
  46
  47
  48
  49
  50
  51
  52
  53
  54
  55
  56
  57
  58
  59
  60
  61
  62
  63
  64
  65
  66
  67
  68
  69
  70
  71
  72
  73
  74
  75
  76
  77
  78
  79
  80
  81
  82
  83
  84
  85
  86
  87
  88
  89
  90
  91
  92
  93
  94
  95
  96
  97
  98
  99
  100
  101
  102
  103
  104
  105
  106
  107
  108
  109
  110
  111
  112
  113
  114
  115
  116
  117
  118
  119
  120
  121
  122
  123
  124

三、运行截图

四、ACTION_USB_DEVICE_ATTACHED 和 ACTION_USB_DEVICE_DETACHED的缺点

广播是去监测U盘插入和拔出的，也就意味着，你只要一插入或者一拔出U盘，就是收到这两个广播。它不会管你的设备有没有准备好，有没有mounted或者unmounted。

因此就需要引入一个新的广播 android.os.storage.extra.VOLUME_STATE。

这个广播就是用来监听Volume状态的。当外置Usb设备在Mounted或者UnMounted的时候则就可以用来做监听 int 类型的 VolumeInfo.EXTRA_VOLUME_STATE。

注意：android.os.storage.extra.VOLUME_STATE 一定要声明读写权限，否则是收不到的。

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

  
 
  1
  2

文章来源: blog.csdn.net，作者：福州-司马懿，版权归原作者所有，如需转载，请联系作者。

原文链接：blog.csdn.net/chy555chy/article/details/52350810

点赞
收藏
关注作者

0/1000

抱歉，系统识别当前为高风险访问，暂不支持该操作

全部回复

上滑加载中

设置昵称

在此一键设置昵称，即可参与社区互动！

*长度不超过10个汉字或20个英文字符，设置后3个月内不可修改。

确认取消

加入云驻计划，成为创作者

华为云周边好礼
免费体验产品
特殊身份标识
线下官方门票
内部专家零距离
与10000+优质创作者共同成长

立即加入

Android 通过广播监听USB连接状态的改变

一、原理讲解

二、代码如下

三、运行截图

四、ACTION_USB_DEVICE_ATTACHED 和 ACTION_USB_DEVICE_DETACHED的缺点

全部回复

设置昵称

关于作者

目录

加入云驻计划，成为创作者

Android 通过广播监听USB连接状态的改变

一、原理讲解

二、代码如下

三、运行截图

四、ACTION_USB_DEVICE_ATTACHED 和 ACTION_USB_DEVICE_DETACHED的缺点

全部回复

设置昵称

关于作者

目录

加入云驻计划，成为创作者

推荐阅读

相关产品