Android USB 主机示例在 Android Studio 中不工作
Android USB Host example not working in Android Studio
我在 http://mobilemerit.com/android-app-for-usb-host-with-source-code/# 找到了以下示例。此代码旨在列出连接的 USB 设备，但它不会在 Android Studio 中编译。我想知道要编译它需要什么 运行?
activity_main.xml
<linearlayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:paddingBottom="@dimen/activity_vertical_margin"
android:paddingLeft="@dimen/activity_horizontal_margin"
android:paddingRight="@dimen/activity_horizontal_margin"
android:paddingTop="@dimen/activity_vertical_margin"
android:orientation="vertical"
tools:context=".MainActivity" >
<button android:id="@+id/check"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:text="Check USB devices"></button>
<textview android:id="@+id/info"
android:layout_width="match_parent"
android:layout_height="wrap_content"></textview>
</linearlayout>
MainActivity.java
package com.mobilemerit.usbhost;
import java.util.HashMap;
import java.util.Iterator;
import android.app.Activity;
import android.app.PendingIntent;
import android.content.BroadcastReceiver;
import android.content.Context;
import android.content.Intent;
import android.content.IntentFilter;
import android.hardware.usb.UsbDevice;
import android.hardware.usb.UsbManager;
import android.os.Bundle;
import android.util.Log;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.Button;
import android.widget.TextView;
import com.mobilemerit.usbhost.R;
public class MainActivity extends Activity {
PendingIntent mPermissionIntent;
Button btnCheck;
TextView textInfo;
UsbDevice device;
UsbManager manager;
private static final String ACTION_USB_PERMISSION = "com.mobilemerit.usbhost.USB_PERMISSION";
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
btnCheck = (Button) findViewById(R.id.check);
textInfo = (TextView) findViewById(R.id.info);
btnCheck.setOnClickListener(new OnClickListener() {
@Override
public void onClick(View arg0) {
textInfo.setText("");
checkInfo();
}
});
}
private void checkInfo() {
manager = (UsbManager) getSystemService(Context.USB_SERVICE);
/*
* this block required if you need to communicate to USB devices it's
* take permission to device
* if you want than you can set this to which device you want to communicate
*/
// ------------------------------------------------------------------
mPermissionIntent = PendingIntent.getBroadcast(this, 0, new Intent(
ACTION_USB_PERMISSION), 0);
IntentFilter filter = new IntentFilter(ACTION_USB_PERMISSION);
registerReceiver(mUsbReceiver, filter);
// -------------------------------------------------------------------
HashMap<string , UsbDevice> deviceList = manager.getDeviceList();
Iterator<usbdevice> deviceIterator = deviceList.values().iterator();
String i = "";
while (deviceIterator.hasNext()) {
device = deviceIterator.next();
manager.requestPermission(device, mPermissionIntent);
i += "\n" + "DeviceID: " + device.getDeviceId() + "\n"
+ "DeviceName: " + device.getDeviceName() + "\n"
+ "DeviceClass: " + device.getDeviceClass() + " - "
+ "DeviceSubClass: " + device.getDeviceSubclass() + "\n"
+ "VendorID: " + device.getVendorId() + "\n"
+ "ProductID: " + device.getProductId() + "\n";
}
textInfo.setText(i);
}
private final BroadcastReceiver mUsbReceiver = new BroadcastReceiver() {
public void onReceive(Context context, Intent intent) {
String action = intent.getAction();
if (ACTION_USB_PERMISSION.equals(action)) {
synchronized (this) {
UsbDevice device = (UsbDevice) intent
.getParcelableExtra(UsbManager.EXTRA_DEVICE);
if (intent.getBooleanExtra(
UsbManager.EXTRA_PERMISSION_GRANTED, false)) {
if (device != null) {
// call method to set up device communication
}
} else {
Log.d("ERROR", "permission denied for device " + device);
}
}
}
}
};
}
Manfest.xml
< ?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
package="com.mobilemerit.usbhost"
android:versionCode="1"
android:versionName="1.0" >
<uses -feature android:name="android.hardware.usb.host"></uses>
<uses -sdk
android:minSdkVersion="12"
android:targetSdkVersion="19"></uses>
<application android:allowBackup="true"
android:icon="@drawable/ic_launcher"
android:label="@string/app_name"
android:theme="@style/AppTheme" >
<activity android:name="com.mobilemerit.usbhost.MainActivity"
android:label="@string/app_name" >
<intent -filter>
<action android:name="android.intent.action.MAIN"></action>
<category android:name="android.intent.category.LAUNCHER"></category>
</intent>
</activity>
</application>
</manifest>
在Android Studio 中，您可以选择"Import Project" 和select USB 示例文件所在的文件夹。 Select 顶级文件夹。
之后 Android Studio 将为您构建项目。如果您遇到错误或 Android Studio 需要下载文件，您应该让它这样做。然后点击菜单：Build -> Rebuild Project。
全部完成！
这是已构建并准备好 运行 的文件：Working AS USB example
由 mobilemerit 提供。
这是应用程序 运行 在我的三星 Note 3 上运行时来自 Android Studio 的屏幕截图：Picture of USB example running on Note 3
PS。我与 mobilemerit 没有任何关系。
我有 Android Studio 1.3 版。我已经纠正了 1.3 的差异。确保您键入的应用程序名称：
usbhost
公司名称类型：
mobilemerit.com
这将为您提供正确的包名称。我的模拟器无法检测到 USB 设备。所以，我使用了我的 phone 并连接了一个 USB 设备。
activity_main.xml
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:paddingBottom="@dimen/activity_vertical_margin"
android:paddingLeft="@dimen/activity_horizontal_margin"
android:paddingRight="@dimen/activity_horizontal_margin"
android:paddingTop="@dimen/activity_vertical_margin"
android:orientation="vertical"
tools:context=".MainActivity" >
<Button android:id="@+id/check"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:text="Check USB devices" />
<TextView android:id="@+id/info"
android:layout_width="match_parent"
android:layout_height="wrap_content"/>
</LinearLayout>
MainActivity.java
package com.mobilemerit.usbhost;
import java.util.HashMap;
import java.util.Iterator;
import android.app.Activity;
import android.app.PendingIntent;
import android.content.BroadcastReceiver;
import android.content.Context;
import android.content.Intent;
import android.content.IntentFilter;
import android.hardware.usb.UsbDevice;
import android.hardware.usb.UsbManager;
import android.os.Bundle;
import android.util.Log;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.Button;
import android.widget.TextView;
import com.mobilemerit.usbhost.R;
public class MainActivity extends Activity {
PendingIntent mPermissionIntent;
Button btnCheck;
TextView textInfo;
UsbDevice device;
UsbManager manager;
private static final String ACTION_USB_PERMISSION = "com.mobilemerit.usbhost.USB_PERMISSION";
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
btnCheck = (Button) findViewById(R.id.check);
textInfo = (TextView) findViewById(R.id.info);
btnCheck.setOnClickListener(new OnClickListener() {
@Override
public void onClick(View arg0) {
textInfo.setText("");
checkInfo();
}
});
}
private void checkInfo() {
manager = (UsbManager) getSystemService(Context.USB_SERVICE);
/*
* this block required if you need to communicate to USB devices it's
* take permission to device
* if you want than you can set this to which device you want to communicate
*/
// ------------------------------------------------------------------
mPermissionIntent = PendingIntent.getBroadcast(this, 0, new Intent(
ACTION_USB_PERMISSION), 0);
IntentFilter filter = new IntentFilter(ACTION_USB_PERMISSION);
registerReceiver(mUsbReceiver, filter);
// -------------------------------------------------------------------
HashMap<String , UsbDevice> deviceList = manager.getDeviceList();
Iterator<UsbDevice> deviceIterator = deviceList.values().iterator();
String i = "";
while (deviceIterator.hasNext()) {
device = deviceIterator.next();
manager.requestPermission(device, mPermissionIntent);
i += "\n" + "DeviceID: " + device.getDeviceId() + "\n"
+ "DeviceName: " + device.getDeviceName() + "\n"
+ "DeviceClass: " + device.getDeviceClass() + " - "
+ "DeviceSubClass: " + device.getDeviceSubclass() + "\n"
+ "VendorID: " + device.getVendorId() + "\n"
+ "ProductID: " + device.getProductId() + "\n";
}
textInfo.setText(i);
}
private final BroadcastReceiver mUsbReceiver = new BroadcastReceiver() {
public void onReceive(Context context, Intent intent) {
String action = intent.getAction();
if (ACTION_USB_PERMISSION.equals(action)) {
synchronized (this) {
UsbDevice device = (UsbDevice) intent
.getParcelableExtra(UsbManager.EXTRA_DEVICE);
if (intent.getBooleanExtra(
UsbManager.EXTRA_PERMISSION_GRANTED, false)) {
if (device != null) {
// call method to set up device communication
}
} else {
Log.d("ERROR", "permission denied for device " + device);
}
}
}
}
};
}
AndroidManifest.xml
<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
package="com.mobilemerit.usbhost"
android:versionCode="1"
android:versionName="1.0" >
<uses-feature android:name="android.hardware.usb.host"/>
<uses-sdk
android:minSdkVersion="12"
android:targetSdkVersion="19"/>
<application android:allowBackup="true"
android:icon="@mipmap/ic_launcher"
android:label="@string/app_name"
android:theme="@style/AppTheme" >
<activity android:name="com.mobilemerit.usbhost.MainActivity"
android:label="@string/app_name" >
<intent-filter>
<action android:name="android.intent.action.MAIN"/>
<category android:name="android.intent.category.LAUNCHER"/>
</intent-filter>
</activity>
</application>
</manifest>
我在 http://mobilemerit.com/android-app-for-usb-host-with-source-code/# 找到了以下示例。此代码旨在列出连接的 USB 设备，但它不会在 Android Studio 中编译。我想知道要编译它需要什么 运行?
activity_main.xml
<linearlayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:paddingBottom="@dimen/activity_vertical_margin"
android:paddingLeft="@dimen/activity_horizontal_margin"
android:paddingRight="@dimen/activity_horizontal_margin"
android:paddingTop="@dimen/activity_vertical_margin"
android:orientation="vertical"
tools:context=".MainActivity" >
<button android:id="@+id/check"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:text="Check USB devices"></button>
<textview android:id="@+id/info"
android:layout_width="match_parent"
android:layout_height="wrap_content"></textview>
</linearlayout>
MainActivity.java
package com.mobilemerit.usbhost;
import java.util.HashMap;
import java.util.Iterator;
import android.app.Activity;
import android.app.PendingIntent;
import android.content.BroadcastReceiver;
import android.content.Context;
import android.content.Intent;
import android.content.IntentFilter;
import android.hardware.usb.UsbDevice;
import android.hardware.usb.UsbManager;
import android.os.Bundle;
import android.util.Log;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.Button;
import android.widget.TextView;
import com.mobilemerit.usbhost.R;
public class MainActivity extends Activity {
PendingIntent mPermissionIntent;
Button btnCheck;
TextView textInfo;
UsbDevice device;
UsbManager manager;
private static final String ACTION_USB_PERMISSION = "com.mobilemerit.usbhost.USB_PERMISSION";
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
btnCheck = (Button) findViewById(R.id.check);
textInfo = (TextView) findViewById(R.id.info);
btnCheck.setOnClickListener(new OnClickListener() {
@Override
public void onClick(View arg0) {
textInfo.setText("");
checkInfo();
}
});
}
private void checkInfo() {
manager = (UsbManager) getSystemService(Context.USB_SERVICE);
/*
* this block required if you need to communicate to USB devices it's
* take permission to device
* if you want than you can set this to which device you want to communicate
*/
// ------------------------------------------------------------------
mPermissionIntent = PendingIntent.getBroadcast(this, 0, new Intent(
ACTION_USB_PERMISSION), 0);
IntentFilter filter = new IntentFilter(ACTION_USB_PERMISSION);
registerReceiver(mUsbReceiver, filter);
// -------------------------------------------------------------------
HashMap<string , UsbDevice> deviceList = manager.getDeviceList();
Iterator<usbdevice> deviceIterator = deviceList.values().iterator();
String i = "";
while (deviceIterator.hasNext()) {
device = deviceIterator.next();
manager.requestPermission(device, mPermissionIntent);
i += "\n" + "DeviceID: " + device.getDeviceId() + "\n"
+ "DeviceName: " + device.getDeviceName() + "\n"
+ "DeviceClass: " + device.getDeviceClass() + " - "
+ "DeviceSubClass: " + device.getDeviceSubclass() + "\n"
+ "VendorID: " + device.getVendorId() + "\n"
+ "ProductID: " + device.getProductId() + "\n";
}
textInfo.setText(i);
}
private final BroadcastReceiver mUsbReceiver = new BroadcastReceiver() {
public void onReceive(Context context, Intent intent) {
String action = intent.getAction();
if (ACTION_USB_PERMISSION.equals(action)) {
synchronized (this) {
UsbDevice device = (UsbDevice) intent
.getParcelableExtra(UsbManager.EXTRA_DEVICE);
if (intent.getBooleanExtra(
UsbManager.EXTRA_PERMISSION_GRANTED, false)) {
if (device != null) {
// call method to set up device communication
}
} else {
Log.d("ERROR", "permission denied for device " + device);
}
}
}
}
};
}
Manfest.xml
< ?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
package="com.mobilemerit.usbhost"
android:versionCode="1"
android:versionName="1.0" >
<uses -feature android:name="android.hardware.usb.host"></uses>
<uses -sdk
android:minSdkVersion="12"
android:targetSdkVersion="19"></uses>
<application android:allowBackup="true"
android:icon="@drawable/ic_launcher"
android:label="@string/app_name"
android:theme="@style/AppTheme" >
<activity android:name="com.mobilemerit.usbhost.MainActivity"
android:label="@string/app_name" >
<intent -filter>
<action android:name="android.intent.action.MAIN"></action>
<category android:name="android.intent.category.LAUNCHER"></category>
</intent>
</activity>
</application>
</manifest>
在Android Studio 中，您可以选择"Import Project" 和select USB 示例文件所在的文件夹。 Select 顶级文件夹。 之后 Android Studio 将为您构建项目。如果您遇到错误或 Android Studio 需要下载文件，您应该让它这样做。然后点击菜单：Build -> Rebuild Project。 全部完成！
这是已构建并准备好 运行 的文件：Working AS USB example 由 mobilemerit 提供。
这是应用程序 运行 在我的三星 Note 3 上运行时来自 Android Studio 的屏幕截图：Picture of USB example running on Note 3
PS。我与 mobilemerit 没有任何关系。
我有 Android Studio 1.3 版。我已经纠正了 1.3 的差异。确保您键入的应用程序名称：
usbhost
公司名称类型：
mobilemerit.com
这将为您提供正确的包名称。我的模拟器无法检测到 USB 设备。所以，我使用了我的 phone 并连接了一个 USB 设备。
activity_main.xml
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:paddingBottom="@dimen/activity_vertical_margin"
android:paddingLeft="@dimen/activity_horizontal_margin"
android:paddingRight="@dimen/activity_horizontal_margin"
android:paddingTop="@dimen/activity_vertical_margin"
android:orientation="vertical"
tools:context=".MainActivity" >
<Button android:id="@+id/check"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:text="Check USB devices" />
<TextView android:id="@+id/info"
android:layout_width="match_parent"
android:layout_height="wrap_content"/>
</LinearLayout>
MainActivity.java
package com.mobilemerit.usbhost;
import java.util.HashMap;
import java.util.Iterator;
import android.app.Activity;
import android.app.PendingIntent;
import android.content.BroadcastReceiver;
import android.content.Context;
import android.content.Intent;
import android.content.IntentFilter;
import android.hardware.usb.UsbDevice;
import android.hardware.usb.UsbManager;
import android.os.Bundle;
import android.util.Log;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.Button;
import android.widget.TextView;
import com.mobilemerit.usbhost.R;
public class MainActivity extends Activity {
PendingIntent mPermissionIntent;
Button btnCheck;
TextView textInfo;
UsbDevice device;
UsbManager manager;
private static final String ACTION_USB_PERMISSION = "com.mobilemerit.usbhost.USB_PERMISSION";
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
btnCheck = (Button) findViewById(R.id.check);
textInfo = (TextView) findViewById(R.id.info);
btnCheck.setOnClickListener(new OnClickListener() {
@Override
public void onClick(View arg0) {
textInfo.setText("");
checkInfo();
}
});
}
private void checkInfo() {
manager = (UsbManager) getSystemService(Context.USB_SERVICE);
/*
* this block required if you need to communicate to USB devices it's
* take permission to device
* if you want than you can set this to which device you want to communicate
*/
// ------------------------------------------------------------------
mPermissionIntent = PendingIntent.getBroadcast(this, 0, new Intent(
ACTION_USB_PERMISSION), 0);
IntentFilter filter = new IntentFilter(ACTION_USB_PERMISSION);
registerReceiver(mUsbReceiver, filter);
// -------------------------------------------------------------------
HashMap<String , UsbDevice> deviceList = manager.getDeviceList();
Iterator<UsbDevice> deviceIterator = deviceList.values().iterator();
String i = "";
while (deviceIterator.hasNext()) {
device = deviceIterator.next();
manager.requestPermission(device, mPermissionIntent);
i += "\n" + "DeviceID: " + device.getDeviceId() + "\n"
+ "DeviceName: " + device.getDeviceName() + "\n"
+ "DeviceClass: " + device.getDeviceClass() + " - "
+ "DeviceSubClass: " + device.getDeviceSubclass() + "\n"
+ "VendorID: " + device.getVendorId() + "\n"
+ "ProductID: " + device.getProductId() + "\n";
}
textInfo.setText(i);
}
private final BroadcastReceiver mUsbReceiver = new BroadcastReceiver() {
public void onReceive(Context context, Intent intent) {
String action = intent.getAction();
if (ACTION_USB_PERMISSION.equals(action)) {
synchronized (this) {
UsbDevice device = (UsbDevice) intent
.getParcelableExtra(UsbManager.EXTRA_DEVICE);
if (intent.getBooleanExtra(
UsbManager.EXTRA_PERMISSION_GRANTED, false)) {
if (device != null) {
// call method to set up device communication
}
} else {
Log.d("ERROR", "permission denied for device " + device);
}
}
}
}
};
}
AndroidManifest.xml
<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
package="com.mobilemerit.usbhost"
android:versionCode="1"
android:versionName="1.0" >
<uses-feature android:name="android.hardware.usb.host"/>
<uses-sdk
android:minSdkVersion="12"
android:targetSdkVersion="19"/>
<application android:allowBackup="true"
android:icon="@mipmap/ic_launcher"
android:label="@string/app_name"
android:theme="@style/AppTheme" >
<activity android:name="com.mobilemerit.usbhost.MainActivity"
android:label="@string/app_name" >
<intent-filter>
<action android:name="android.intent.action.MAIN"/>
<category android:name="android.intent.category.LAUNCHER"/>
</intent-filter>
</activity>
</application>
</manifest>