1 /* 2 * Copyright (C) 2011 The Android Open Source Project 3 * 4 * Licensed under the Apache License, Version 2.0 (the "License"); 5 * you may not use this file except in compliance with the License. 6 * You may obtain a copy of the License at 7 * 8 * http://www.apache.org/licenses/LICENSE-2.0 9 * 10 * Unless required by applicable law or agreed to in writing, software 11 * distributed under the License is distributed on an "AS IS" BASIS, 12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 13 * See the License for the specific language governing permissions and 14 * limitations under the License. 15 */ 16 17 package com.android.accessorychat; 18 19 import android.app.Activity; 20 import android.app.PendingIntent; 21 import android.content.BroadcastReceiver; 22 import android.content.Context; 23 import android.content.Intent; 24 import android.content.IntentFilter; 25 import android.os.Bundle; 26 import android.os.Handler; 27 import android.os.Message; 28 import android.os.ParcelFileDescriptor; 29 import android.view.KeyEvent; 30 import android.view.View; 31 import android.view.inputmethod.EditorInfo; 32 import android.util.Log; 33 import android.widget.EditText; 34 import android.widget.TextView; 35 36 import android.hardware.usb.UsbManager; 37 import android.hardware.usb.UsbAccessory; 38 39 import java.io.FileDescriptor; 40 import java.io.FileInputStream; 41 import java.io.FileOutputStream; 42 import java.io.IOException; 43 44 public class AccessoryChat extends Activity implements Runnable, TextView.OnEditorActionListener { 45 46 private static final String TAG = "AccessoryChat"; 47 48 private static final String ACTION_USB_PERMISSION = 49 "com.android.accessorychat.action.USB_PERMISSION"; 50 51 private TextView mLog; 52 private EditText mEditText; 53 private ParcelFileDescriptor mFileDescriptor; 54 private FileInputStream mInputStream; 55 private FileOutputStream mOutputStream; 56 private UsbManager mUsbManager; 57 private PendingIntent mPermissionIntent; 58 private boolean mPermissionRequestPending; 59 60 private static final int MESSAGE_LOG = 1; 61 62 private final BroadcastReceiver mUsbReceiver = new BroadcastReceiver() { 63 @Override 64 public void onReceive(Context context, Intent intent) { 65 if (ACTION_USB_PERMISSION.equals(intent.getAction())) { 66 synchronized (this) { 67 UsbAccessory accessory = (UsbAccessory) intent.getParcelableExtra(UsbManager.EXTRA_ACCESSORY); 68 if (intent.getBooleanExtra(UsbManager.EXTRA_PERMISSION_GRANTED, false)) { 69 if (accessory != null) { 70 openAccessory(accessory); 71 } 72 } else { 73 Log.d(TAG, "permission denied for accessory " + accessory); 74 } 75 mPermissionRequestPending = false; 76 } 77 } 78 } 79 }; 80 81 @Override onCreate(Bundle savedInstanceState)82 public void onCreate(Bundle savedInstanceState) { 83 super.onCreate(savedInstanceState); 84 85 mUsbManager = (UsbManager) getSystemService(Context.USB_SERVICE); 86 mPermissionIntent = PendingIntent.getBroadcast(this, 0, new Intent(ACTION_USB_PERMISSION), 0); 87 IntentFilter filter = new IntentFilter(ACTION_USB_PERMISSION); 88 registerReceiver(mUsbReceiver, filter); 89 90 setContentView(R.layout.accessory_chat); 91 mLog = (TextView)findViewById(R.id.log); 92 mEditText = (EditText)findViewById(R.id.message); 93 mEditText.setOnEditorActionListener(this); 94 } 95 96 @Override onResume()97 public void onResume() { 98 super.onResume(); 99 100 Intent intent = getIntent(); 101 Log.d(TAG, "intent: " + intent); 102 UsbAccessory[] accessories = mUsbManager.getAccessoryList(); 103 UsbAccessory accessory = (accessories == null ? null : accessories[0]); 104 if (accessory != null) { 105 if (mUsbManager.hasPermission(accessory)) { 106 openAccessory(accessory); 107 } else { 108 synchronized (mUsbReceiver) { 109 if (!mPermissionRequestPending) { 110 mUsbManager.requestPermission(accessory, mPermissionIntent); 111 mPermissionRequestPending = true; 112 } 113 } 114 } 115 } else { 116 Log.d(TAG, "mAccessory is null"); 117 } 118 } 119 120 @Override onPause()121 public void onPause() { 122 super.onPause(); 123 if (mFileDescriptor != null) { 124 try { 125 mFileDescriptor.close(); 126 } catch (IOException e) { 127 } finally { 128 mFileDescriptor = null; 129 } 130 } 131 } 132 133 @Override onDestroy()134 public void onDestroy() { 135 unregisterReceiver(mUsbReceiver); 136 super.onDestroy(); 137 } 138 openAccessory(UsbAccessory accessory)139 private void openAccessory(UsbAccessory accessory) { 140 Log.d(TAG, "openAccessory: " + accessory); 141 mFileDescriptor = mUsbManager.openAccessory(accessory); 142 if (mFileDescriptor != null) { 143 FileDescriptor fd = mFileDescriptor.getFileDescriptor(); 144 mInputStream = new FileInputStream(fd); 145 mOutputStream = new FileOutputStream(fd); 146 Thread thread = new Thread(null, this, "AccessoryChat"); 147 thread.start(); 148 Log.d(TAG, "openAccessory succeeded"); 149 } else { 150 Log.d(TAG, "openAccessory fail"); 151 } 152 } 153 onEditorAction(TextView v, int actionId, KeyEvent event)154 public boolean onEditorAction(TextView v, int actionId, KeyEvent event) { 155 if (actionId == EditorInfo.IME_ACTION_DONE && mOutputStream != null) { 156 try { 157 mOutputStream.write(v.getText().toString().getBytes()); 158 } catch (IOException e) { 159 Log.e(TAG, "write failed", e); 160 } 161 v.setText(""); 162 return true; 163 } 164 Log.d(TAG, "onEditorAction " + actionId + " event: " + event); 165 return false; 166 } 167 run()168 public void run() { 169 int ret = 0; 170 byte[] buffer = new byte[16384]; 171 while (ret >= 0) { 172 try { 173 ret = mInputStream.read(buffer); 174 } catch (IOException e) { 175 break; 176 } 177 178 if (ret > 0) { 179 Message m = Message.obtain(mHandler, MESSAGE_LOG); 180 String text = new String(buffer, 0, ret); 181 Log.d(TAG, "chat: " + text); 182 m.obj = text; 183 mHandler.sendMessage(m); 184 } 185 } 186 Log.d(TAG, "thread out"); 187 } 188 189 Handler mHandler = new Handler() { 190 @Override 191 public void handleMessage(Message msg) { 192 switch (msg.what) { 193 case MESSAGE_LOG: 194 mLog.setText(mLog.getText() + "\n" + (String)msg.obj); 195 break; 196 } 197 } 198 }; 199 } 200 201 202