思路：
重寫Activity的dispatchKeyEvent()方法 將獲取到的內容自定義處理 然後再回調得到掃描內容；
缺點：識別不了中文；
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);
}
/**
* 截取按鍵事件 分發給掃描槍解析類
* 這裏沒有返回true進行事件攔截是由於 業務需要在HTML中input有焦點時自動查詢
* @param event
* @return
*/
@Override
public boolean dispatchKeyEvent(KeyEvent event) {
mScannerKeyEventHelper.analysisKeyEvent(event);
return super.dispatchKeyEvent(event);
}
/**
* 掃描成功回調
* @param barcode
*/
@Override
public void onScanSuccess(String barcode) {
Toast.makeText(MainActivity.this,"掃描槍內容："+barcode,Toast.LENGTH_SHORT).show();
//根據業務需求處理掃描到的內容
}
@Override
protected void onDestroy() {
mScannerKeyEventHelper.onDestroy();
super.onDestroy();
}
}
掃描槍解析類：
public class ScannerKeyEventHelper {
private StringBuffer mStringBufferResult; //掃描內容
private boolean mCaps; //大小寫
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();
}
};
}
/**
* 掃描成功結果
*/
private void performScanSuccess(){
String barcode = mStringBufferResult.toString();
if(mOnScanSuccessListener != null)
mOnScanSuccessListener.onScanSuccess(barcode);
mStringBufferResult.setLength(0);
}
/**
* 掃描事件解析
* @param event
*/
public void analysisKeyEvent(KeyEvent event){
int keyCode = event.getKeyCode();
//判斷字母大小寫
checkLetterStatus(event);
if(event.getAction() == KeyEvent.ACTION_DOWN)
{
char aChar = getInputCode(event);
if(aChar != 0)
{
mStringBufferResult.append(aChar);
}
if(keyCode == KeyEvent.KEYCODE_ENTER)
{
//回車鍵 返回
mHandler.removeCallbacks(mScanningFinishedRunnable);
mHandler.post(mScanningFinishedRunnable);
}
}
}
/**
* shift鍵
* @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鍵 大寫
mCaps = true;
}
else
{
//小寫
mCaps = false;
}
}
}
/**
* 獲取掃描內容
* @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)
{
//數字
if(mCaps)//是否按住了shift鍵
{
//按住了 需要將數字轉換爲對應的字符
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
{
//其他符號
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;
}
}