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/*
* Copyright (C) 2011 The Android Open Source Project
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package com.android.accessorychat;
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.os.Bundle;
import android.os.Handler;
import android.os.Message;
import android.os.ParcelFileDescriptor;
import android.view.KeyEvent;
import android.view.View;
import android.view.inputmethod.EditorInfo;
import android.util.Log;
import android.widget.EditText;
import android.widget.TextView;
import com.android.future.usb.UsbAccessory;
import com.android.future.usb.UsbManager;
import java.io.FileDescriptor;
import java.io.FileInputStream;
import java.io.FileOutputStream;
import java.io.IOException;
public class AccessoryChat extends Activity implements Runnable, TextView.OnEditorActionListener {
private static final String TAG = "AccessoryChat";
private static final String ACTION_USB_PERMISSION =
"com.android.accessorychat.action.USB_PERMISSION";
private TextView mLog;
private EditText mEditText;
private ParcelFileDescriptor mFileDescriptor;
private FileInputStream mInputStream;
private FileOutputStream mOutputStream;
private UsbManager mUsbManager;
private PendingIntent mPermissionIntent;
private boolean mPermissionRequestPending;
private static final int MESSAGE_LOG = 1;
private final BroadcastReceiver mUsbReceiver = new BroadcastReceiver() {
@Override
public void onReceive(Context context, Intent intent) {
if (ACTION_USB_PERMISSION.equals(intent.getAction())) {
synchronized (this) {
UsbAccessory accessory = UsbManager.getAccessory(intent);
if (intent.getBooleanExtra(UsbManager.EXTRA_PERMISSION_GRANTED, false)) {
openAccessory(accessory);
} else {
Log.d(TAG, "permission denied for accessory " + accessory);
}
mPermissionRequestPending = false;
}
}
}
};
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
mUsbManager = UsbManager.getInstance(this);
mPermissionIntent = PendingIntent.getBroadcast(this, 0, new Intent(ACTION_USB_PERMISSION), 0);
IntentFilter filter = new IntentFilter(ACTION_USB_PERMISSION);
registerReceiver(mUsbReceiver, filter);
setContentView(R.layout.accessory_chat);
mLog = (TextView)findViewById(R.id.log);
mEditText = (EditText)findViewById(R.id.message);
mEditText.setOnEditorActionListener(this);
}
@Override
public void onResume() {
super.onResume();
Intent intent = getIntent();
Log.d(TAG, "intent: " + intent);
UsbAccessory[] accessories = mUsbManager.getAccessoryList();
UsbAccessory accessory = (accessories == null ? null : accessories[0]);
if (accessory != null) {
if (mUsbManager.hasPermission(accessory)) {
openAccessory(accessory);
} else {
synchronized (mUsbReceiver) {
if (!mPermissionRequestPending) {
mUsbManager.requestPermission(accessory, mPermissionIntent);
mPermissionRequestPending = true;
}
}
}
} else {
Log.d(TAG, "mAccessory is null");
}
}
@Override
public void onPause() {
super.onPause();
if (mFileDescriptor != null) {
try {
mFileDescriptor.close();
} catch (IOException e) {
} finally {
mFileDescriptor = null;
}
}
}
@Override
public void onDestroy() {
unregisterReceiver(mUsbReceiver);
super.onDestroy();
}
private void openAccessory(UsbAccessory accessory) {
mFileDescriptor = mUsbManager.openAccessory(accessory);
if (mFileDescriptor != null) {
FileDescriptor fd = mFileDescriptor.getFileDescriptor();
mInputStream = new FileInputStream(fd);
mOutputStream = new FileOutputStream(fd);
Thread thread = new Thread(null, this, "AccessoryChat");
thread.start();
Log.d(TAG, "openAccessory succeeded");
} else {
Log.d(TAG, "openAccessory fail");
}
}
public boolean onEditorAction(TextView v, int actionId, KeyEvent event) {
if (actionId == EditorInfo.IME_ACTION_DONE && mOutputStream != null) {
try {
mOutputStream.write(v.getText().toString().getBytes());
} catch (IOException e) {
Log.e(TAG, "write failed", e);
}
v.setText("");
return true;
}
Log.d(TAG, "onEditorAction " + actionId + " event: " + event);
return false;
}
public void run() {
int ret = 0;
byte[] buffer = new byte[16384];
while (ret >= 0) {
try {
ret = mInputStream.read(buffer);
} catch (IOException e) {
break;
}
if (ret > 0) {
Message m = Message.obtain(mHandler, MESSAGE_LOG);
String text = new String(buffer, 0, ret);
Log.d(TAG, "chat: " + text);
m.obj = text;
mHandler.sendMessage(m);
}
}
Log.d(TAG, "thread out");
}
Handler mHandler = new Handler() {
@Override
public void handleMessage(Message msg) {
switch (msg.what) {
case MESSAGE_LOG:
mLog.setText(mLog.getText() + "\n" + (String)msg.obj);
break;
}
}
};
}
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