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music-synthesizer-for-android
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Code Issues Releases Wiki Activity

More refined USB MIDI handling

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This patch puts up a permissions dialog when needed for connecting a USB
MIDI device. It also avoids scanning the bus when the device is known
from the intent. This should make cases where there are multiple devices
on the USB bus more graceful.
master
Raph Levien 11 years ago
parent 85f4bc7512
commit c1a59d57dd
2 changed files with 79 additions and 29 deletions
Show all changes Ignore whitespace when comparing lines Ignore changes in amount of whitespace Ignore changes in whitespace at EOL
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  1. 106
      android/src/com/levien/synthesizer/android/ui/PianoActivity2.java
  2. 2
      android/src/com/levien/synthesizer/android/usb/UsbMidiDevice.java

106
android/src/com/levien/synthesizer/android/ui/PianoActivity2.java
Unescape View File

@ -23,6 +23,7 @@ import java.util.HashMap;
import android.annotation.TargetApi;
import android.app.Activity;
import android.app.PendingIntent;
import android.content.BroadcastReceiver;
import android.content.Context;
import android.content.Intent;
@ -62,7 +63,7 @@ import com.levien.synthesizer.android.widgets.piano.PianoView;
public class PianoActivity2 extends Activity {
@Override
public void onCreate(Bundle savedInstanceState) {
Log.d("synth", "activity onCreate");
Log.d("synth", "activity onCreate " + getIntent());
super.onCreate(savedInstanceState);
getWindow().addFlags(WindowManager.LayoutParams.FLAG_FULLSCREEN |
WindowManager.LayoutParams.FLAG_KEEP_SCREEN_ON);
@ -131,8 +132,6 @@ public class PianoActivity2 extends Activity {
});
piano_.bindTo(androidGlue_);
// This is now done in onResume
//tryConnectUsb();
final boolean doStats = false;
@ -179,12 +178,19 @@ public class PianoActivity2 extends Activity {
stats.setText(jitterStats_.reportLong());
}
});
if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.HONEYCOMB_MR1) {
setupUsbMidi(getIntent());
}
}
@Override
protected void onDestroy() {
Log.d("synth", "activity onDestroy");
androidGlue_.shutdown();
if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.HONEYCOMB_MR1) {
unregisterReceiver(usbReceiver_);
}
super.onDestroy();
}
@ -192,24 +198,24 @@ public class PianoActivity2 extends Activity {
protected void onPause() {
Log.d("synth", "activity onPause");
androidGlue_.setPlayState(false);
if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.HONEYCOMB_MR1) {
unregisterReceiver(usbReceiver_);
}
setMidiInterface(null, null);
super.onPause();
}
@Override
protected void onResume() {
Log.d("synth", "activity onResume");
Log.d("synth", "activity onResume " + getIntent());
androidGlue_.setPlayState(true);
tryConnectUsb();
if (usbDevice_ != null && usbMidiConnection_ == null) {
connectUsbMidi(usbDevice_);
}
super.onResume();
}
@Override
protected void onNewIntent(Intent intent) {
Log.d("synth", "activity onNewIntent " + intent);
connectUsbFromIntent(intent);
}
@TargetApi(Build.VERSION_CODES.HONEYCOMB_MR1)
@ -223,7 +229,7 @@ public class PianoActivity2 extends Activity {
}
return null;
}
@TargetApi(Build.VERSION_CODES.HONEYCOMB_MR1)
private boolean setMidiInterface(UsbDevice device, UsbInterface intf) {
if (usbMidiConnection_ != null) {
@ -238,14 +244,13 @@ public class PianoActivity2 extends Activity {
}
usbMidiConnection_.close();
usbMidiConnection_ = null;
usbMidiDeviceName_ = null;
}
if (device != null && intf != null) {
UsbManager usbManager = (UsbManager) getSystemService(Context.USB_SERVICE);
UsbDeviceConnection connection = usbManager.openDevice(device);
if (connection != null) {
if (connection.claimInterface(intf, true)) {
usbMidiDeviceName_ = device.getDeviceName();
usbDevice_ = device;
usbMidiConnection_ = connection;
usbMidiInterface_ = intf;
usbMidiDevice_ = new UsbMidiDevice(this, usbMidiConnection_, intf);
@ -262,45 +267,88 @@ public class PianoActivity2 extends Activity {
return false;
}
private boolean connectUsbMidi(UsbDevice device) {
UsbInterface intf = device != null ? findMidiInterface(device) : null;
boolean success = setMidiInterface(device, intf);
usbDevice_ = success ? device : null;
return success;
}
// scan for MIDI devices on the USB bus
@TargetApi(Build.VERSION_CODES.HONEYCOMB_MR1)
private void tryConnectUsb() {
if (Build.VERSION.SDK_INT < Build.VERSION_CODES.HONEYCOMB_MR1) {
return;
}
private void scanUsbMidi() {
UsbManager usbManager = (UsbManager) getSystemService(Context.USB_SERVICE);
HashMap<String, UsbDevice> deviceList = usbManager.getDeviceList();
Log.i("synth", "USB device count=" + deviceList.size());
for (UsbDevice device : deviceList.values()) {
Log.i("synth", "usb name=" + device.toString() + " #if=" + device.getInterfaceCount());
UsbInterface usbIf = findMidiInterface(device);
if (setMidiInterface(device, usbIf)) {
break;
UsbInterface intf = findMidiInterface(device);
if (intf != null) {
if (usbManager.hasPermission(device)) {
if (setMidiInterface(device, intf)) {
usbDevice_ = device;
break;
}
} else {
synchronized (usbReceiver_) {
if (!permissionRequestPending_) {
permissionRequestPending_ = true;
usbManager.requestPermission(device, permissionIntent_);
}
}
break; // Don't try to connect anything else after perms dialog up
}
}
}
}
@TargetApi(Build.VERSION_CODES.HONEYCOMB_MR1)
boolean connectUsbFromIntent(Intent intent) {
if (UsbManager.ACTION_USB_DEVICE_ATTACHED.equals(intent.getAction())) {
UsbDevice device = (UsbDevice)intent.getParcelableExtra(UsbManager.EXTRA_DEVICE);
return connectUsbMidi(device);
} else {
return false;
}
}
@TargetApi(Build.VERSION_CODES.HONEYCOMB_MR1)
void setupUsbMidi(Intent intent) {
permissionIntent_ = PendingIntent.getBroadcast(this, 0, new Intent(
ACTION_USB_PERMISSION), 0);
IntentFilter filter = new IntentFilter();
// Attach intent is handled in manifest, don't want to get it twice.
//filter.addAction(UsbManager.ACTION_USB_DEVICE_ATTACHED);
filter.addAction(UsbManager.ACTION_USB_DEVICE_DETACHED);
filter.addAction(ACTION_USB_PERMISSION);
registerReceiver(usbReceiver_, filter);
if (!connectUsbFromIntent(intent)) {
scanUsbMidi();
}
}
private static final String ACTION_USB_PERMISSION = "com.levien.synthesizer.USB_PERSMISSION";
BroadcastReceiver usbReceiver_ = new BroadcastReceiver() {
@TargetApi(Build.VERSION_CODES.HONEYCOMB_MR1)
public void onReceive(Context context, Intent intent) {
String action = intent.getAction();
if (UsbManager.ACTION_USB_DEVICE_ATTACHED.equals(action)) {
Log.i("synth", "broadcast receiver: attach");
UsbDevice device = (UsbDevice)intent.getParcelableExtra(UsbManager.EXTRA_DEVICE);
UsbInterface intf = findMidiInterface(device);
if (intf != null) {
setMidiInterface(device, intf);
}
connectUsbFromIntent(intent);
} else if (UsbManager.ACTION_USB_DEVICE_DETACHED.equals(action)) {
Log.i("synth", "broadcast receiver: detach");
UsbDevice device = (UsbDevice)intent.getParcelableExtra(UsbManager.EXTRA_DEVICE);
String deviceName = device.getDeviceName();
if (usbMidiDeviceName_ != null && usbMidiDeviceName_.equals(deviceName)) {
setMidiInterface(null, null);
if (usbDevice_ != null && usbDevice_.equals(device)) {
connectUsbMidi(null);
}
} else if (ACTION_USB_PERMISSION.equals(action)) {
synchronized (this) {
UsbDevice device = (UsbDevice)intent.getParcelableExtra(UsbManager.EXTRA_DEVICE);
if (intent.getBooleanExtra(UsbManager.EXTRA_PERMISSION_GRANTED, false)) {
connectUsbMidi(device);
} else {
Log.d("synth", "permission denied for device " + device);
}
permissionRequestPending_ = false;
}
}
}
@ -345,8 +393,10 @@ public class PianoActivity2 extends Activity {
private Handler statusHandler_;
private Runnable statusRunnable_;
private JitterStats jitterStats_;
private UsbDevice usbDevice_;
private UsbDeviceConnection usbMidiConnection_;
private UsbMidiDevice usbMidiDevice_;
private UsbInterface usbMidiInterface_;
private String usbMidiDeviceName_;
private PendingIntent permissionIntent_;
private boolean permissionRequestPending_;
}

2
android/src/com/levien/synthesizer/android/usb/UsbMidiDevice.java
Unescape View File

@ -79,7 +79,7 @@ public class UsbMidiDevice {
return;
}
}
final int TIMEOUT = 1000;
final int TIMEOUT = 0;
int nBytes = mDeviceConnection.bulkTransfer(mEndpoint, buf, buf.length, TIMEOUT);
if (nBytes < 0) {
Log.e("synth", "bulkTransfer error " + nBytes);

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