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AccessoryChat.javaAPI DocAndroid 5.1 API6757Thu Mar 12 22:22:30 GMT 2015com.android.accessorychat

AccessoryChat

public class AccessoryChat extends android.app.Activity implements Runnable, TextView.OnEditorActionListener

Fields Summary
private static final String
TAG
private static final String
ACTION_USB_PERMISSION
private android.widget.TextView
mLog
private android.widget.EditText
mEditText
private android.os.ParcelFileDescriptor
mFileDescriptor
private FileInputStream
mInputStream
private FileOutputStream
mOutputStream
private android.hardware.usb.UsbManager
mUsbManager
private android.app.PendingIntent
mPermissionIntent
private boolean
mPermissionRequestPending
private static final int
MESSAGE_LOG
private final android.content.BroadcastReceiver
mUsbReceiver
android.os.Handler
mHandler
Constructors Summary
Methods Summary
public voidonCreate(android.os.Bundle savedInstanceState)


    
        
        super.onCreate(savedInstanceState);

        mUsbManager = (UsbManager) getSystemService(Context.USB_SERVICE);
        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);
    
public voidonDestroy()

        unregisterReceiver(mUsbReceiver);
       super.onDestroy();
    
public booleanonEditorAction(android.widget.TextView v, int actionId, android.view.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 voidonPause()

        super.onPause();
        if (mFileDescriptor != null) {
            try {
                mFileDescriptor.close();
            } catch (IOException e) {
            } finally {
                mFileDescriptor = null;
            }
        }
    
public voidonResume()

        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");
        }
    
private voidopenAccessory(android.hardware.usb.UsbAccessory accessory)

        Log.d(TAG, "openAccessory: " + 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 voidrun()

        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");