ZXing集成在Android App中包括PhoneGap

分类：编程问答

如何解决ZXing集成在Android App中包括PhoneGap

| 我想使用ZXing在我的Android应用中解码条形码。我正在使用Phonegap构建应用程序。现在，我想集成ZXing来扫描条形码并在我的应用程序中处理结果。我正在使用Android 2.1-update1 SDK。 首先，我在应用程序中集成了以下类： IntentIntegrator.java IntentResult.java 然后，我创建了一个名为\“ Scanactivity \”的活动，其内容如下： 
import android.app.Activity;
import android.content.Intent;
import com.google.zxing.integration.android.IntentIntegrator;
import com.google.zxing.integration.android.IntentResult;
public class ScanActivity extends Activity {
  public void scanCode() {
    IntentIntegrator.initiateScan(ScanActivity.this);
  }
  public void onActivityResult(int requestCode,int resultCode,Intent intent) {
    IntentResult scanResult = IntentIntegrator.parseActivityResult(requestCode,resultCode,intent);
    if (scanResult != null) {
      // handle scan result
    }
    // else continue with any other code you need in the method
  }
}
在视图中，我放置了一个按钮，该按钮通过按调用scanCode（）方法。 
$(\"#button_scan\").click(function(e) {
  ScanActivity.scanCode();
});
我在目标设备上安装了应用程序“条形码扫描仪（ZXing）”以使用意图功能。如果我在应用程序中按“扫描按钮”，则该应用程序将崩溃并关闭。我怎么了 这是logcat： 
04-13 10:20:46.636: WARN/dalvikvm(2525): JNI WARNING: DeleteLocalRef(0x44caf3c0) failed to find entry (valid=1)
04-13 10:20:46.636: WARN/dalvikvm(2525): JNI WARNING: DeleteLocalRef(0x44caf3c0) failed to find entry (valid=1)
04-13 10:20:46.636: ERROR/dalvikvm(2525): Class lookup Landroid/webkit/WebHistoryItem; attemped while exception Ljava/lang/NullPointerException; pending
04-13 10:20:46.636: INFO/dalvikvm(2525): DALVIK THREADS:
04-13 10:20:46.636: INFO/dalvikvm(2525): \"main\" prio=5 tid=3 WAIT
04-13 10:20:46.636: INFO/dalvikvm(2525):   | group=\"main\" sCount=0 dsCount=0 s=N obj=0x4001e250 self=0xbe30
04-13 10:20:46.636: INFO/dalvikvm(2525):   | sysTid=2525 nice=0 sched=0/0 cgrp=unknown handle=-1344001356
04-13 10:20:46.636: INFO/dalvikvm(2525):   at java.lang.Object.wait(Native Method)
04-13 10:20:46.636: INFO/dalvikvm(2525):   - waiting on <0x2488a8> (a android.os.MessageQueue)
04-13 10:20:46.636: INFO/dalvikvm(2525):   at java.lang.Object.wait(Object.java:288)
04-13 10:20:46.636: INFO/dalvikvm(2525):   at android.os.MessageQueue.next(MessageQueue.java:148)
04-13 10:20:46.636: INFO/dalvikvm(2525):   at android.os.Looper.loop(Looper.java:110)
04-13 10:20:46.636: INFO/dalvikvm(2525):   at android.app.ActivityThread.main(ActivityThread.java:4363)
04-13 10:20:46.636: INFO/dalvikvm(2525):   at java.lang.reflect.Method.invokeNative(Native Method)
04-13 10:20:46.636: INFO/dalvikvm(2525):   at java.lang.reflect.Method.invoke(Method.java:521)
04-13 10:20:46.636: INFO/dalvikvm(2525):   at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:868)
04-13 10:20:46.636: INFO/dalvikvm(2525):   at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:626)
04-13 10:20:46.636: INFO/dalvikvm(2525):   at dalvik.system.NativeStart.main(Native Method)
04-13 10:20:46.646: INFO/dalvikvm(2525): \"http3\" prio=5 tid=31 WAIT
04-13 10:20:46.646: INFO/dalvikvm(2525):   | group=\"main\" sCount=0 dsCount=0 s=N obj=0x44c970a8 self=0x296f40
04-13 10:20:46.646: INFO/dalvikvm(2525):   | sysTid=2544 nice=1 sched=0/0 cgrp=unknown handle=2715736
04-13 10:20:46.646: INFO/dalvikvm(2525):   at java.lang.Object.wait(Native Method)
04-13 10:20:46.646: INFO/dalvikvm(2525):   - waiting on <0x28cff0> (a android.net.http.RequestQueue)
04-13 10:20:46.646: INFO/dalvikvm(2525):   at java.lang.Object.wait(Object.java:288)
04-13 10:20:46.646: INFO/dalvikvm(2525):   at android.net.http.ConnectionThread.run(ConnectionThread.java:98)
04-13 10:20:46.646: INFO/dalvikvm(2525): \"http2\" prio=5 tid=29 WAIT
04-13 10:20:46.646: INFO/dalvikvm(2525):   | group=\"main\" sCount=0 dsCount=0 s=N obj=0x44c96e58 self=0x294f00
04-13 10:20:46.646: INFO/dalvikvm(2525):   | sysTid=2543 nice=1 sched=0/0 cgrp=unknown handle=2707480
04-13 10:20:46.646: INFO/dalvikvm(2525):   at java.lang.Object.wait(Native Method)
04-13 10:20:46.646: INFO/dalvikvm(2525):   - waiting on <0x28cff0> (a android.net.http.RequestQueue)
04-13 10:20:46.646: INFO/dalvikvm(2525):   at java.lang.Object.wait(Object.java:288)
04-13 10:20:46.646: INFO/dalvikvm(2525):   at android.net.http.ConnectionThread.run(ConnectionThread.java:98)
04-13 10:20:46.646: INFO/dalvikvm(2525): \"http1\" prio=5 tid=27 WAIT
04-13 10:20:46.646: INFO/dalvikvm(2525):   | group=\"main\" sCount=0 dsCount=0 s=N obj=0x44c96ba0 self=0x294cf8
04-13 10:20:46.646: INFO/dalvikvm(2525):   | sysTid=2542 nice=1 sched=0/0 cgrp=unknown handle=2706960
04-13 10:20:46.646: INFO/dalvikvm(2525):   at java.lang.Object.wait(Native Method)
04-13 10:20:46.646: INFO/dalvikvm(2525):   - waiting on <0x28cff0> (a android.net.http.RequestQueue)
04-13 10:20:46.646: INFO/dalvikvm(2525):   at java.lang.Object.wait(Object.java:288)
04-13 10:20:46.646: INFO/dalvikvm(2525):   at android.net.http.ConnectionThread.run(ConnectionThread.java:98)
04-13 10:20:46.646: INFO/dalvikvm(2525): \"http0\" prio=5 tid=25 WAIT
04-13 10:20:46.646: INFO/dalvikvm(2525):   | group=\"main\" sCount=0 dsCount=0 s=N obj=0x44c96990 self=0x294be0
04-13 10:20:46.646: INFO/dalvikvm(2525):   | sysTid=2541 nice=1 sched=0/0 cgrp=unknown handle=2667208
04-13 10:20:46.646: INFO/dalvikvm(2525):   at java.lang.Object.wait(Native Method)
04-13 10:20:46.646: INFO/dalvikvm(2525):   - waiting on <0x28cff0> (a android.net.http.RequestQueue)
04-13 10:20:46.646: INFO/dalvikvm(2525):   at java.lang.Object.wait(Object.java:288)
04-13 10:20:46.646: INFO/dalvikvm(2525):   at android.net.http.ConnectionThread.run(ConnectionThread.java:98)
04-13 10:20:46.646: INFO/dalvikvm(2525): \"Thread-12\" prio=5 tid=23 TIMED_WAIT
04-13 10:20:46.646: INFO/dalvikvm(2525):   | group=\"main\" sCount=0 dsCount=0 s=N obj=0x44c7b460 self=0x261498
04-13 10:20:46.646: INFO/dalvikvm(2525):   | sysTid=2540 nice=0 sched=0/0 cgrp=unknown handle=2375456
04-13 10:20:46.646: INFO/dalvikvm(2525):   at java.lang.Object.wait(Native Method)
04-13 10:20:46.646: INFO/dalvikvm(2525):   - waiting on <0x2444b0> (a com.phonegap.DroidGap$1$1)
04-13 10:20:46.646: INFO/dalvikvm(2525):   at java.lang.Object.wait(Object.java:326)
04-13 10:20:46.646: INFO/dalvikvm(2525):   at com.phonegap.DroidGap$1$1.run(DroidGap.java:387)
04-13 10:20:46.646: INFO/dalvikvm(2525):   at java.lang.Thread.run(Thread.java:1096)
04-13 10:20:46.646: INFO/dalvikvm(2525): \"Thread-11\" prio=5 tid=21 NATIVE
04-13 10:20:46.646: INFO/dalvikvm(2525):   | group=\"main\" sCount=0 dsCount=0 s=N obj=0x44c7af48 self=0x262998
04-13 10:20:46.646: INFO/dalvikvm(2525):   | sysTid=2539 nice=0 sched=0/0 cgrp=unknown handle=2333912
04-13 10:20:46.646: INFO/dalvikvm(2525):   at org.apache.harmony.luni.platform.OSNetworkSystem.acceptSocketImpl(Native Method)
04-13 10:20:46.646: INFO/dalvikvm(2525):   at org.apache.harmony.luni.platform.OSNetworkSystem.accept(OSNetworkSystem.java:69)
04-13 10:20:46.646: INFO/dalvikvm(2525):   at org.apache.harmony.luni.net.PlainSocketImpl.accept(PlainSocketImpl.java:126)
04-13 10:20:46.646: INFO/dalvikvm(2525):   at java.net.ServerSocket.implAccept(ServerSocket.java:285)
04-13 10:20:46.646: INFO/dalvikvm(2525):   at java.net.ServerSocket.accept(ServerSocket.java:164)
04-13 10:20:46.646: INFO/dalvikvm(2525):   at com.phonegap.CallbackServer.run(CallbackServer.java:185)
04-13 10:20:46.646: INFO/dalvikvm(2525):   at java.lang.Thread.run(Thread.java:1096)
04-13 10:20:46.646: INFO/dalvikvm(2525): \"CookieSyncManager\" prio=5 tid=19 TIMED_WAIT
04-13 10:20:46.646: INFO/dalvikvm(2525):   | group=\"main\" sCount=0 dsCount=0 s=N obj=0x44c68588 self=0x127408
04-13 10:20:46.646: INFO/dalvikvm(2525):   | sysTid=2538 nice=10 sched=0/0 cgrp=unknown handle=1220392
04-13 10:20:46.646: INFO/dalvikvm(2525):   at java.lang.Object.wait(Native Method)
04-13 10:20:46.646: INFO/dalvikvm(2525):   - waiting on <0x23b538> (a android.os.MessageQueue)
04-13 10:20:46.646: INFO/dalvikvm(2525):   at java.lang.Object.wait(Object.java:326)
04-13 10:20:46.646: INFO/dalvikvm(2525):   at android.os.MessageQueue.next(MessageQueue.java:144)
04-13 10:20:46.646: INFO/dalvikvm(2525):   at android.os.Looper.loop(Looper.java:110)
04-13 10:20:46.656: INFO/dalvikvm(2525):   at android.webkit.WebSyncManager.run(WebSyncManager.java:90)
04-13 10:20:46.656: INFO/dalvikvm(2525):   at java.lang.Thread.run(Thread.java:1096)
04-13 10:20:46.656: INFO/dalvikvm(2525): \"WebViewCoreThread\" prio=5 tid=17 RUNNABLE
04-13 10:20:46.656: INFO/dalvikvm(2525):   | group=\"main\" sCount=0 dsCount=0 s=N obj=0x44c63210 self=0x136478
04-13 10:20:46.656: INFO/dalvikvm(2525):   | sysTid=2535 nice=0 sched=0/0 cgrp=unknown handle=1339552
04-13 10:20:46.656: INFO/dalvikvm(2525):   at android.webkit.WebViewCore.nativeTouchUp(Native Method)
04-13 10:20:46.656: INFO/dalvikvm(2525):   at android.webkit.WebViewCore.access$3400(WebViewCore.java:48)
04-13 10:20:46.656: INFO/dalvikvm(2525):   at android.webkit.WebViewCore$EventHub$1.handleMessage(WebViewCore.java:1094)
04-13 10:20:46.656: INFO/dalvikvm(2525):   at android.os.Handler.dispatchMessage(Handler.java:99)
04-13 10:20:46.656: INFO/dalvikvm(2525):   at android.os.Looper.loop(Looper.java:123)
04-13 10:20:46.656: INFO/dalvikvm(2525):   at android.webkit.WebViewCore$WebCoreThread.run(WebViewCore.java:611)
04-13 10:20:46.656: INFO/dalvikvm(2525):   at java.lang.Thread.run(Thread.java:1096)
04-13 10:20:46.656: INFO/dalvikvm(2525): \"Binder Thread #3\" prio=5 tid=15 NATIVE
04-13 10:20:46.656: INFO/dalvikvm(2525):   | group=\"main\" sCount=0 dsCount=0 s=N obj=0x44c530e8 self=0x130c70
04-13 10:20:46.656: INFO/dalvikvm(2525):   | sysTid=2534 nice=0 sched=0/0 cgrp=unknown handle=1354864
04-13 10:20:46.656: INFO/dalvikvm(2525):   at dalvik.system.NativeStart.run(Native Method)
04-13 10:20:46.656: INFO/dalvikvm(2525): \"Binder Thread #2\" prio=5 tid=13 NATIVE
04-13 10:20:46.656: INFO/dalvikvm(2525):   | group=\"main\" sCount=0 dsCount=0 s=N obj=0x44c53028 self=0x1269e0
04-13 10:20:46.656: INFO/dalvikvm(2525):   | sysTid=2533 nice=0 sched=0/0 cgrp=unknown handle=1383744
04-13 10:20:46.656: INFO/dalvikvm(2525):   at dalvik.system.NativeStart.run(Native Method)
04-13 10:20:46.656: INFO/dalvikvm(2525): \"Binder Thread #1\" prio=5 tid=11 NATIVE
04-13 10:20:46.656: INFO/dalvikvm(2525):   | group=\"main\" sCount=0 dsCount=0 s=N obj=0x44c4dc50 self=0x132840
04-13 10:20:46.656: INFO/dalvikvm(2525):   | sysTid=2532 nice=0 sched=0/0 cgrp=unknown handle=1354576
04-13 10:20:46.656: INFO/dalvikvm(2525):   at dalvik.system.NativeStart.run(Native Method)
04-13 10:20:46.656: INFO/dalvikvm(2525): \"JDWP\" daemon prio=5 tid=9 VMWAIT
04-13 10:20:46.656: INFO/dalvikvm(2525):   | group=\"system\" sCount=0 dsCount=0 s=N obj=0x44c4c2a0 self=0x14e0f0
04-13 10:20:46.656: INFO/dalvikvm(2525):   | sysTid=2529 nice=0 sched=0/0 cgrp=unknown handle=1135864
04-13 10:20:46.656: INFO/dalvikvm(2525):   at dalvik.system.NativeStart.run(Native Method)
04-13 10:20:46.656: INFO/dalvikvm(2525): \"Signal Catcher\" daemon prio=5 tid=7 VMWAIT
04-13 10:20:46.656: INFO/dalvikvm(2525):   | group=\"system\" sCount=0 dsCount=0 s=N obj=0x44c4c1e8 self=0x1127b0
04-13 10:20:46.656: INFO/dalvikvm(2525):   | sysTid=2528 nice=0 sched=0/0 cgrp=unknown handle=1338232
04-13 10:20:46.656: INFO/dalvikvm(2525):   at dalvik.system.NativeStart.run(Native Method)
04-13 10:20:46.656: INFO/dalvikvm(2525): \"HeapWorker\" daemon prio=5 tid=5 VMWAIT
04-13 10:20:46.656: INFO/dalvikvm(2525):   | group=\"system\" sCount=0 dsCount=0 s=N obj=0x43562ed8 self=0x12b268
04-13 10:20:46.656: INFO/dalvikvm(2525):   | sysTid=2526 nice=0 sched=0/0 cgrp=unknown handle=1355192
04-13 10:20:46.656: INFO/dalvikvm(2525):   at dalvik.system.NativeStart.run(Native Method)
04-13 10:20:46.656: ERROR/dalvikvm(2525): VM aborting
这是堆栈： 
ScanActivity.scanCode() line: 12    
    IntentIntegrator.initiateScan(ScanActivity.this);

Activity.class:
    ScanActivity(Activity).startActivityForResult(Intent,int) line: 2749   

Reference.class:
    WeakReference(Reference).get() line: 147
然后该应用程序终止。     

解决方法

在此处查看PhoneGap条码教程。您将逐步通过Purplecabbage的PhoneGap插件通过zxing创建一个示例应用程序。     

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