Android 获取扫码枪的扫描内容
16lz
2021-01-23
思路：
重写Activity的dispatchKeyEvent()方法 将获取到的内容自定义处理 然后再回调得到扫描内容
import android.support.v7.app.AppCompatActivity;import android.os.Bundle;import android.view.KeyEvent;import android.widget.Toast;public class MainActivity extends AppCompatActivity implements ScannerKeyEventHelper.OnScanSuccessListener { private ScannerKeyEventHelper mScannerKeyEventHelper; @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.activity_main); mScannerKeyEventHelper = new ScannerKeyEventHelper(this); } /** * 截取按键事件 分发给扫描枪解析类 * 这里没有返回true进行事件拦截是由于 业务需要在HTML中input有焦点时自动查询 * @param event * @return */ @Override public boolean dispatchKeyEvent(KeyEvent event) { mScannerKeyEventHelper.analysisKeyEvent(event); return super.dispatchKeyEvent(event); } /** * 扫描成功回调 * @param barcode */ @Override public void onScanSuccess(String barcode) { Toast.makeText(MainActivity.this,"扫描枪内容："+barcode,Toast.LENGTH_SHORT).show(); //根据业务需求处理扫描到的内容 } @Override protected void onDestroy() { mScannerKeyEventHelper.onDestroy(); super.onDestroy(); }}扫描枪解析类：
public class ScannerKeyEventHelper { private StringBuffer mStringBufferResult; //扫描内容 private boolean mCaps; //大小写 private final Handler mHandler; private final Runnable mScanningFinishedRunnable; private OnScanSuccessListener mOnScanSuccessListener; public ScannerKeyEventHelper(OnScanSuccessListener onScanSuccessListener){ mOnScanSuccessListener = onScanSuccessListener; mStringBufferResult = new StringBuffer(); mHandler = new Handler(); mScanningFinishedRunnable = new Runnable() { @Override public void run() { performScanSuccess(); } }; } /** * 扫描成功结果 */ private void performScanSuccess(){ String barcode = mStringBufferResult.toString(); if(mOnScanSuccessListener != null) mOnScanSuccessListener.onScanSuccess(barcode); mStringBufferResult.setLength(0); } /** * 扫描事件解析 * @param event */ public void analysisKeyEvent(KeyEvent event){ int keyCode = event.getKeyCode(); //判断字母大小写 checkLetterStatus(event); if(event.getAction() == KeyEvent.ACTION_DOWN) { char aChar = getInputCode(event); if(aChar != 0) { mStringBufferResult.append(aChar); } if(keyCode == KeyEvent.KEYCODE_ENTER) { //回车键 返回 mHandler.removeCallbacks(mScanningFinishedRunnable); mHandler.post(mScanningFinishedRunnable); } } } /** * shift键 * @param keyEvent */ private void checkLetterStatus(KeyEvent keyEvent){ int keyCode = keyEvent.getKeyCode(); if(keyCode == KeyEvent.KEYCODE_SHIFT_LEFT || keyCode == KeyEvent.KEYCODE_SHIFT_RIGHT) { if(keyEvent.getAction() == KeyEvent.ACTION_DOWN) { //按住shift键 大写 mCaps = true; } else { //小写 mCaps = false; } } } /** * 获取扫描内容 * @param keyEvent * @return */ private char getInputCode(KeyEvent keyEvent){ char aChar; int keyCode = keyEvent.getKeyCode(); Log.i("TAGKEYCODE",keyCode+""); if(keyCode >= KeyEvent.KEYCODE_A && keyCode <= keyEvent.KEYCODE_Z)//29< keycode <54 { //字母 aChar = (char)((mCaps?'A':'a')+keyCode - KeyEvent.KEYCODE_A);// } else if (keyCode >= KeyEvent.KEYCODE_0 && keyCode <= KeyEvent.KEYCODE_9) { //数字 if(mCaps)//是否按住了shift键 { //按住了 需要将数字转换为对应的字符 switch (keyCode) { case KeyEvent.KEYCODE_0: aChar = ')'; break; case KeyEvent.KEYCODE_1: aChar = '!'; break; case KeyEvent.KEYCODE_2: aChar = '@'; break; case KeyEvent.KEYCODE_3: aChar = '#'; break; case KeyEvent.KEYCODE_4: aChar = '$'; break; case KeyEvent.KEYCODE_5: aChar = '%'; break; case KeyEvent.KEYCODE_6: aChar = '^'; break; case KeyEvent.KEYCODE_7: aChar = '&'; break; case KeyEvent.KEYCODE_8: aChar = '*'; break; case KeyEvent.KEYCODE_9: aChar = '('; break; default: aChar = ' '; break; } } else { aChar = (char)('0'+keyCode- KeyEvent.KEYCODE_0); } } else { //其他符号 switch (keyCode) { case KeyEvent.KEYCODE_PERIOD: aChar = '.'; break; case KeyEvent.KEYCODE_MINUS: aChar = mCaps?'_':'-'; break; case KeyEvent.KEYCODE_SLASH: aChar = '/'; break; case KeyEvent.KEYCODE_STAR: aChar = '*'; break; case KeyEvent.KEYCODE_POUND: aChar = '#'; break; case KeyEvent.KEYCODE_SEMICOLON: aChar = mCaps?':':';'; break; case KeyEvent.KEYCODE_AT: aChar = '@'; break; case KeyEvent.KEYCODE_BACKSLASH: aChar = mCaps?'|':'\\'; break; default: aChar = ' '; break; } } return aChar; } public interface OnScanSuccessListener{ void onScanSuccess(String barcode); } public void onDestroy(){ mHandler.removeCallbacks(mScanningFinishedRunnable); mOnScanSuccessListener = null; }}
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