Shulou(Shulou.com)06/03 Report--

This article mainly introduces how to read the mobile phone QR code through the code scanning gun in android, which has a certain reference value, and interested friends can refer to it. I hope you will gain a lot after reading this article.

1. Introduce the auxiliary class of code scanning equipment

Public class ScanGunKeyEventHelper {private final static long MESSAGE_DELAY = 500; / / delay 500ms to determine whether the scan code is completed. Private StringBuffer mStringBufferResult; / / scan code content private boolean mCaps; / / case sensitive private final Handler mHandler; private final BluetoothAdapter mBluetoothAdapter; private final Runnable mScanningFishedRunnable; private OnScanSuccessListener mOnScanSuccessListener; private String mDeviceName; public ScanGunKeyEventHelper (OnScanSuccessListener onScanSuccessListener) {mOnScanSuccessListener = onScanSuccessListener; mBluetoothAdapter = BluetoothAdapter.getDefaultAdapter (); mStringBufferResult = new StringBuffer () MHandler = new Handler (); mScanningFishedRunnable = new Runnable () {@ Override public void run () {performScanSuccess ();}};} / * returns the result of successful code scan * / private void performScanSuccess () {String barcode = mStringBufferResult.toString () If (mOnScanSuccessListener! = null) mOnScanSuccessListener.onScanSuccess (barcode); mStringBufferResult.setLength (0);} / * Scancode gun event resolution * @ param event * / public void analysisKeyEvent (KeyEvent event) {int keyCode = event.getKeyCode (); / / letter case judgment checkLetterStatus (event) If (event.getAction () = = KeyEvent.ACTION_DOWN) {char aChar = getInputCode (event);; if (aChar! = 0) {mStringBufferResult.append (aChar);} if (keyCode = = KeyEvent.KEYCODE_ENTER) {/ / if it is an enter key, return mHandler.removeCallbacks (mScanningFishedRunnable) directly MHandler.post (mScanningFishedRunnable);} else {/ / delay post. If there are other events in the 500ms, mHandler.removeCallbacks (mScanningFishedRunnable); mHandler.postDelayed (mScanningFishedRunnable, MESSAGE_DELAY);}} / / check the shift key private void checkLetterStatus (KeyEvent event) {int keyCode = event.getKeyCode () If (keyCode = = KeyEvent.KEYCODE_SHIFT_RIGHT | | keyCode = = KeyEvent.KEYCODE_SHIFT_LEFT) {if (event.getAction () = = KeyEvent.ACTION_DOWN) {/ / press the shift key to indicate uppercase mCaps = true;} else {/ / release the shift key, indicating lowercase mCaps = false } / / get scan content private char getInputCode (KeyEvent event) {int keyCode = event.getKeyCode (); char aChar; if (keyCode > = KeyEvent.KEYCODE_A & & keyCode = KeyEvent.KEYCODE_0 & & keyCode

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