package com.example.qrcode.decode; /** * Created by yangyu on 17/10/18. */ import android.os.Handler; import android.os.Looper; import com.example.qrcode.ScannerActivity; import com.google.zxing.BarcodeFormat; import com.google.zxing.DecodeHintType; import java.util.Collection; import java.util.EnumMap; import java.util.Map; import java.util.concurrent.CountDownLatch; /** * This thread does all the heavy lifting of decoding the images. * * @author [email protected] (Daniel Switkin) */ final class DecodeThread extends Thread { private final ScannerActivity activity; private final Map<DecodeHintType, Object> hints; private Handler handler; private final CountDownLatch handlerInitLatch; DecodeThread(ScannerActivity activity, Collection<BarcodeFormat> decodeFormats, String characterSet ) { this.activity = activity; handlerInitLatch = new CountDownLatch(1); hints = new EnumMap<>(DecodeHintType.class); hints.put(DecodeHintType.POSSIBLE_FORMATS, decodeFormats); if (characterSet != null) { hints.put(DecodeHintType.CHARACTER_SET, characterSet); } hints.put(DecodeHintType.TRY_HARDER, true); } Handler getHandler() { try { handlerInitLatch.await(); } catch (InterruptedException ie) { } return handler; } @Override public void run() { Looper.prepare(); handler = new DecodeHandler(activity, hints); handlerInitLatch.countDown(); Looper.loop(); } }