【发布时间】：2016-11-21 03:46:48
【问题描述】：
我刚刚开始涉足 android 开发中稍微复杂一些的事情。我正在尝试在我的应用程序中设置一个页面，使其具有一个打开“简单相机”的按钮，带有一个复选框，然后返回图像的缩略图并使用它来处理条形码。单击页面上的复选框后，我的应用程序似乎崩溃了，并且我一直在关注 google codelabs 教程，了解如何使该 API 正常工作。也许是因为图像是缩略图？如果你们能帮忙，那就太棒了。
public class AddItemActivity extends AppCompatActivity {
static final int REQUEST_IMAGE_CAPTURE = 1;
public TextView txtView;
BarcodeDetector detector;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
getSupportActionBar().setTitle("Add Item");
setContentView(R.layout.activity_add_item);
}
public void ItemInfo(View view){
Intent intent = new Intent(this, ItemInfoActivity.class);
AddItemActivity.this.startActivity(intent);
}
public void QRLookup(View view){
Intent intent = new Intent(MediaStore.ACTION_IMAGE_CAPTURE);
startActivityForResult(intent, REQUEST_IMAGE_CAPTURE);
}
public void onActivityResult(int requestCode, int resultCode, Intent data){
if (requestCode == REQUEST_IMAGE_CAPTURE && resultCode == RESULT_OK) {
txtView = (TextView) this.findViewById(R.id.ResultQR);
detector =
new BarcodeDetector.Builder(getApplicationContext())
.setBarcodeFormats(Barcode.DATA_MATRIX | Barcode.QR_CODE)
.build();
if(!detector.isOperational()){
txtView.setText("Could not set up the detector!");
return;}
Bundle extras = data.getExtras();
Bitmap imageBitmap = (Bitmap) extras.get("data");
Frame frame = new Frame.Builder().setBitmap(imageBitmap).build();
SparseArray<Barcode> barcodes = detector.detect(frame);
Barcode thisCode = barcodes.valueAt(0);
txtView.setText(thisCode.rawValue);
}
}
}
这是我的活动。这是我的 xml。
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
android:background="#383838"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:orientation="vertical"
android:paddingLeft="40dp"
android:paddingRight="40dp"
android:paddingTop="20dp"
android:paddingBottom="100dp"
tools:context=".AddItemActivity">
//Buttons
<Button
android:layout_marginTop="30dp"
android:layout_width="125dp"
android:layout_gravity="center"
android:layout_height="30dp"
android:text="Add Item"
android:background="#31be31"
android:onClick="ItemInfo" />
<Button
android:layout_marginTop="30dp"
android:layout_width="125dp"
android:layout_gravity="center"
android:layout_height="60dp"
android:background="#31be31"
android:text="QR LOOKUP"
android:onClick="QRLookup"/>
<TextView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:id="@+id/ResultQR" />
</LinearLayout>
最后是我的崩溃日志，或者我在 Android Studio 中调用的 android 监视器。
07-18 09:33:12.890 16396-16396/com.arcx.cranium I/art: Late-enabling -Xcheck:jni
07-18 09:33:12.939 16396-16396/com.arcx.cranium W/System: ClassLoader referenced unknown path: /data/app/com.arcx.cranium-2/lib/arm64
07-18 09:33:22.187 16396-16396/com.arcx.cranium W/System: ClassLoader referenced unknown path: /data/app/com.arcx.cranium-2/lib/arm64
07-18 09:33:22.389 16396-16396/com.arcx.cranium W/art: Before Android 4.1, method android.graphics.PorterDuffColorFilter android.support.graphics.drawable.VectorDrawableCompat.updateTintFilter(android.graphics.PorterDuffColorFilter, android.content.res.ColorStateList, android.graphics.PorterDuff$Mode) would have incorrectly overridden the package-private method in android.graphics.drawable.Drawable
07-18 09:33:22.589 16396-16856/com.arcx.cranium D/OpenGLRenderer: Use EGL_SWAP_BEHAVIOR_PRESERVED: true
07-18 09:33:22.684 16396-16856/com.arcx.cranium I/Adreno: QUALCOMM build : fcf4852, I1af360237c
Build Date : 09/23/15
OpenGL ES Shader Compiler Version: XE031.05.13.02
Local Branch : mybranch14465806
Remote Branch : quic/LA.BF64.1.2.9_v2
Remote Branch : NONE
Reconstruct Branch : NOTHING
07-18 09:33:22.738 16396-16856/com.arcx.cranium I/OpenGLRenderer: Initialized EGL, version 1.4
07-18 09:34:45.808 16396-16396/com.arcx.cranium D/ChimeraCfgMgr: Reading stored module config
07-18 09:34:45.884 16396-16396/com.arcx.cranium W/System: ClassLoader referenced unknown path: /data/user/0/com.google.android.gms/app_chimera/m/00000004/n/arm64-v8a
07-18 09:34:45.898 16396-16396/com.arcx.cranium D/ChimeraFileApk: Primary ABI of requesting process is arm64-v8a
07-18 09:34:45.902 16396-16396/com.arcx.cranium D/ChimeraFileApk: Classloading successful. Optimized code found.
07-18 09:34:45.963 16396-16396/com.arcx.cranium D/AndroidRuntime: Shutting down VM
07-18 09:34:45.963 16396-16396/com.arcx.cranium E/AndroidRuntime: FATAL EXCEPTION: main
Process: com.arcx.cranium, PID: 16396
java.lang.RuntimeException: Failure delivering result ResultInfo{who=null, request=1, result=-1, data=Intent { act=inline-data (has extras) }} to activity {com.arcx.cranium/com.arcx.cranium.AddItemActivity}: java.lang.ArrayIndexOutOfBoundsException: length=0; index=0
at android.app.ActivityThread.deliverResults(ActivityThread.java:3699)
at android.app.ActivityThread.handleSendResult(ActivityThread.java:3742)
at android.app.ActivityThread.-wrap16(ActivityThread.java)
at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1393)
at android.os.Handler.dispatchMessage(Handler.java:102)
at android.os.Looper.loop(Looper.java:148)
at android.app.ActivityThread.main(ActivityThread.java:5417)
at java.lang.reflect.Method.invoke(Native Method)
at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:726)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:616)
Caused by: java.lang.ArrayIndexOutOfBoundsException: length=0; index=0
at android.util.SparseArray.valueAt(SparseArray.java:291)
at com.arcx.cranium.AddItemActivity.onActivityResult(AddItemActivity.java:55)
at android.app.Activity.dispatchActivityResult(Activity.java:6428)
at android.app.ActivityThread.deliverResults(ActivityThread.java:3695)
at android.app.ActivityThread.handleSendResult(ActivityThread.java:3742)
at android.app.ActivityThread.-wrap16(ActivityThread.java)
at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1393)
at android.os.Handler.dispatchMessage(Handler.java:102)
at android.os.Looper.loop(Looper.java:148)
at android.app.ActivityThread.main(ActivityThread.java:5417)
at java.lang.reflect.Method.invoke(Native Method)
at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:726)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:616)
07-18 09:34:46.967 16396-17395/com.arcx.cranium I/Vision: Connection error: null
07-18 09:34:47.969 16396-17395/com.arcx.cranium I/Vision: Connection error: null
07-18 09:34:50.965 16396-16396/com.arcx.cranium I/Process: Sending signal. PID: 16396 SIG: 9
07-18 09:34:51.116 17414-17414/com.arcx.cranium W/System: ClassLoader referenced unknown path: /data/app/com.arcx.cranium-2/lib/arm64
07-18 09:34:51.343 17414-17414/com.arcx.cranium W/System: ClassLoader referenced unknown path: /data/app/com.arcx.cranium-2/lib/arm64
07-18 09:34:51.554 17414-17414/com.arcx.cranium W/art: Before Android 4.1, method android.graphics.PorterDuffColorFilter android.support.graphics.drawable.VectorDrawableCompat.updateTintFilter(android.graphics.PorterDuffColorFilter, android.content.res.ColorStateList, android.graphics.PorterDuff$Mode) would have incorrectly overridden the package-private method in android.graphics.drawable.Drawable
07-18 09:34:51.914 17414-17444/com.arcx.cranium D/OpenGLRenderer: Use EGL_SWAP_BEHAVIOR_PRESERVED: true
07-18 09:34:51.985 17414-17444/com.arcx.cranium I/Adreno: QUALCOMM build : fcf4852, I1af360237c
Build Date : 09/23/15
OpenGL ES Shader Compiler Version: XE031.05.13.02
Local Branch : mybranch14465806
Remote Branch : quic/LA.BF64.1.2.9_v2
Remote Branch : NONE
Reconstruct Branch : NOTHING
07-18 09:34:51.995 17414-17444/com.arcx.cranium I/OpenGLRenderer: Initialized EGL, version 1.4
非常感谢你们，我不完全确定如何解释一些崩溃日志，我也不能 100% 确定条形码 api 的工作原理。我试图以最简单的方式制作这个应用程序，然后从那里向上移动。 :)
【问题讨论】：
标签： android api debugging camera vision